95 results on '"Camastra S"'
Search Results
2. Expression of thyrotropin and thyroid hormone receptors in adipose tissue of patients with morbid obesity and/or type 2 diabetes: effects of weight loss
- Author
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Nannipieri, M, Cecchetti, F, Anselmino, M, Camastra, S, Niccolini, P, Lamacchia, M, Rossi, M, Iervasi, G, and Ferrannini, E
- Published
- 2009
- Full Text
- View/download PDF
3. Determinants of postabsorptive endogenous glucose output in non-diabetic subjects
- Author
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Natali, A., Toschi, E., Camastra, S., Gastaldelli, A., Groop, L., Ferrannini, E., and on behalf of the European Group for the Study of Insulin Resistance (EGIR)
- Published
- 2000
- Full Text
- View/download PDF
4. Daylong pituitary hormones in morbid obesity: effects of bariatric surgery
- Author
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Camastra, S, Manco, M, Frascerra, S, Iaconelli, A, Mingrone, G, and Ferrannini, E
- Published
- 2009
5. Effect of Roux-en-Y gastric bypass on insulin sensitivity and β-cell function in morbidly obese subjects
- Author
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Camastra, S, Muscelli, E, Bonuccelli, S, Anselmino, M, Scartabelli, G, Mari, A, Nofrate, V, Santini, F, Pinchera, A, and Ferrannini, E
- Published
- 2008
6. Erratum: Expression of thyrotropin and thyroid hormone receptors in the adipose tissue of patients with morbid obesity and/or type 2 diabetes: effects of weight loss
- Author
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Nannipieri, M, Cecchetti, F, Anselmino, M, Camastra, S, Nicolini, P, Lamacchia, M, Rossi, M, Iervasi, G, and Ferrannini, E
- Published
- 2010
- Full Text
- View/download PDF
7. P.084 Visceral Adiposity as the Main Determinant of Carotid Stiffness in a Healthy Population with a Wide BMI and age Range: Evidence from an Echo-Tracking Approach
- Author
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Guerra, E., Malshi, E., Morizzo, C., Kozakova, M., Camastra, S., Muscelli, E., Palombo, C., and Ferrannini, E.
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- 2007
- Full Text
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8. Insulin action and non-esterified fatty acids
- Author
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Ferrannini, E., Camastra, S., Coppack, S. W., Fliser, D., Golay, A., Mitrakou, A., Ferrannini, E., Camastra, S., Coppack, S. W., Fliser, D., Golay, A., and Mitrakou, A.
- Published
- 2017
9. Separate impact of obesity and glucose tolerance on the incretin effect in normal subjects and type 2 diabetic patients
- Author
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Muscelli, E., Mari, A., Casolaro, A., Camastra, S., Seghieri, G., Gastaldelli, A., Holst, Jens Juul, Ferrannini, E., Muscelli, E., Mari, A., Casolaro, A., Camastra, S., Seghieri, G., Gastaldelli, A., Holst, Jens Juul, and Ferrannini, E.
- Abstract
Udgivelsesdato: 2008/5
- Published
- 2008
10. Insulin action and non-esterified fatty acids
- Author
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Ferrannini, E. Camastra, S. Coppack, S.W. Fliser, D. Golay, A. Mitrakou, A.
- Published
- 1997
11. Impact of incretin hormones on beta-cell function in subjects with normal or impaired glucose tolerance
- Author
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Muscelli, E., Mari, A., Natali, A., Astiarraga, B.D., Camastra, S., Frascerra, S., Holst, J.J., Ferrannini, E., Muscelli, E., Mari, A., Natali, A., Astiarraga, B.D., Camastra, S., Frascerra, S., Holst, J.J., and Ferrannini, E.
- Abstract
Udgivelsesdato: 2006/12
- Published
- 2006
12. Insulin resistance in morbid obesity: Reversal with intramyocellular fat depletion
- Author
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Greco, Aldo Virgilio, Mingrone, Geltrude, Giancaterini, A, Manco, M, Morroni, M, Cinti, S, Granzotto, M, Vettor, R, Camastra, S, Ferranini, E., Mingrone, Geltrude (ORCID:0000-0003-2021-528X), Greco, Aldo Virgilio, Mingrone, Geltrude, Giancaterini, A, Manco, M, Morroni, M, Cinti, S, Granzotto, M, Vettor, R, Camastra, S, Ferranini, E., and Mingrone, Geltrude (ORCID:0000-0003-2021-528X)
- Published
- 2002
13. Daylong pituitary hormones in morbid obesity: effects of bariatric surgery
- Author
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Camastra, S, primary, Manco, M, additional, Frascerra, S, additional, Iaconelli, A, additional, Mingrone, G, additional, and Ferrannini, E, additional
- Published
- 2008
- Full Text
- View/download PDF
14. A model for glucose control of insulin secretion during 24 h of free living.
- Author
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Mari, A, primary, Camastra, S, additional, Toschi, E, additional, Giancaterini, A, additional, Gastaldelli, A, additional, Mingrone, G, additional, and Ferrannini, E, additional
- Published
- 2001
- Full Text
- View/download PDF
15. A model for assessing insulin secretion and its control under free-living conditions.
- Author
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Toschi, E, primary, Camastra, S, additional, Mari, A, additional, Gastaldelli, A, additional, Baldi, S, additional, Masoni, A, additional, and Ferrannini, E, additional
- Published
- 2001
- Full Text
- View/download PDF
16. Influence of obesity and type 2 diabetes on gluconeogenesis and glucose output in humans: a quantitative study.
- Author
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Gastaldelli, A, primary, Baldi, S, additional, Pettiti, M, additional, Toschi, E, additional, Camastra, S, additional, Natali, A, additional, Landau, B R, additional, and Ferrannini, E, additional
- Published
- 2000
- Full Text
- View/download PDF
17. Influence of duration of obesity on the insulin resistance of obese non-diabetic patients
- Author
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Muscelli, E, primary, Camastra, S, additional, Gastaldelli, A, additional, Natali, A, additional, Masoni, A, additional, Pecori, N, additional, and Ferrannini, E, additional
- Published
- 1998
- Full Text
- View/download PDF
18. Insulin action and non-esterified fatty acids
- Author
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Ferrannini, E., primary, Camastra, S., additional, Coppack, S. W., additional, Fliser, D., additional, Golay, A., additional, and Mitrakou, A., additional
- Published
- 1997
- Full Text
- View/download PDF
19. beta-cell function in morbidly obese subjects during free living: long-term effects of weight loss.
- Author
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Camastra S, Manco M, Mari A, Baldi S, Gastaldelli A, Greco AV, Mingrone G, Ferrannini E, Camastra, Stefania, Manco, Melania, Mari, Andrea, Baldi, Simona, Gastaldelli, Amalia, Greco, Aldo V, Mingrone, Gertrude, and Ferrannini, Ele
- Abstract
Insulin hypersecretion and insulin resistance are physiologically linked features of obesity. We tested whether extreme hypersecretion impairs beta-cell function under free-living conditions and whether major weight loss modifies insulin hypersecretion, insulin sensitivity, and beta-cell function. Plasma glucose, C-peptide, and free fatty acid concentrations were measured at hourly intervals during 24 h of normal life (including calorie-standardized meals) in 20 morbidly obese nondiabetic patients (BMI 48.4 +/- 1.7 kg/m2) and 7 nonobese age- and sex-matched control subjects; 8 of the obese patients were restudied 6 months and 2 years following biliopancreatic diversion. Insulin secretion was reconstructed from C-peptide levels by deconvolution and related to concurrent glucose levels through a mathematical model incorporating key features of beta-cell function: rate sensitivity, beta-cell glucose sensitivity, and potentiation. Insulin sensitivity (by the euglycemic insulin clamp technique) was reduced by 50% in obese subjects (23.1 +/- 2.5 of obese subjects vs. 52.9 +/- 4.9 micromol.min(-1) . kg(FFM)(-1) of control subjects, means +/- SE, P = 0.0004) as was mean 24-h insulin clearance (median 809 [interquartile range 451] vs. 1,553 [520] ml.min(-1) . m(-2), P < 0.001) due to a 50% reduction in hepatic insulin extraction (P < 0.01). Over 24 h, insulin secretion was doubled in obese subjects (468 nmol [202] in obese subjects vs. 235 [85] of control subjects, P=0.0002). Despite the hypersecretion, beta-cell glucose sensitivity, rate sensitivity, and potentiation were similar in obese and control subjects. Six months postoperatively (weight loss = 33 +/- 3 kg), both insulin hypersecretion (282 nmol [213]) and insulin sensitivity (51.6 +/- 3.7 micromol.min(-1).kg(FFM)(-1)) were normalized. At 2 years (weight loss = 50 +/- 8 kg), insulin sensitivity was supernormal (68.7 +/- 3.3 micromol.min(-1).kg(FFM)(-1)) and insulin secretion was lower than normal (167 nmol [37]) (both P < 0.05 vs. control subjects). In conclusion, severe uncomplicated obesity is characterized by gross insulin hypersecretion and insulin resistance, but the dynamic aspects of beta-cell function are intact. Malabsorptive bariatric surgery corrects both the insulin hypersecretion and the insulin resistance at a time when BMI is still high. With continued weight loss over a 2-year period, moderately obese subjects become supersensitive to insulin and, correspondingly, insulin hyposecretors. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
20. Insulin resistance and hyperinsulinemia: No independent relation to left ventricular mass in humans.
- Author
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Galvan, A Q, Galetta, F, Natali, A, Muscelli, E, Sironi, A M, Cini, G, Camastra, S, and Ferrannini, E
- Published
- 2000
21. Effect of obesity and insulin resistance on resting and glucose-induced thermogenesis in man.
- Author
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Camastra, S, Bonora, E, Del Prato, S, Rett, K, Weck, M, and Ferrannini, E
- Subjects
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OBESITY , *INSULIN resistance - Abstract
OBJECTIVE: to assess the impact of obesity and insulin sensitivity on resting (REE) and glucose-induced thermogenesis (GIT). DESIGN: Data from 322 studies carried out in non-diabetic subjects of either gender, covering a wide range of age (18-80 y) and body mass index (BMI, 18-50 kg/m²). MEASUREMENTS: Insulin sensitivity and thermogenesis were measured by combining the euglycaemic insulin clamp technique with indirect calorimetry. RESULTS: REE was inversely related to age (P = 0.001) and the respiratory quotient (P = 0.03), and positively related to BMI, lean body mass (LBM), fat mass, and percentage fat mass (all P < 0.0001). In a multiple regression model, LBMadjusted REE was estimated to decline by 9% between 18 and 80 y, independently of obesity and insulin sensitivity. In contrast, GIT was strongly associated with insulin sensitivity (P < 0.0001) but not with gender, age or BMI. By multiple regression analysis, GIT was linearly related to insulin sensitivity after controlling for gender, age, BMI and steadystate plasma insulin levels. Furthermore, both of the main components of insulin-mediated glucose disposal (glucose oxidation and glycogen synthesis) correlated with GIT independently of one another. In the subset of subjects (n = 89) in whom waist-to-hip ratio (WHR) measurements were available, GIT was inversely associated with WHR (P < 0.001 after adjustment by gender, age, BMI, insulin sensitivity and steady-state plasma insulin concentration). In this model, a significant interaction between WHR and gender indicated a stronger adverse effect on GIT of a high WHR in women than in men. CONCLUSIONS: In healthy humans, age, lean mass and respiratory quotient are the main independent determinants of resting thermogenesis. In contrast, insulin sensitivity and, to a lesser extent, abdominal obesity are the principal factors controlling glucose-induced thermogenesis. [ABSTRACT FROM AUTHOR]
- Published
- 1999
22. 35th Annual Meeting of the European Association for the Study of Diabetes
- Author
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Melander, A., Olsson, J., Lindberg, G., Salzman, A., Howard, T., Stang, P., Lydick, E., Emslie-Smith, A., Boyle, D. I. R., Evans, J. M. M., Macdonald, T. M., Bain, J., Sullivan, F., Juhl, C., Pørksen, N., Sturis, J., Hollingdal, M., Pincus, S., Veldhuis, J., Dejgaard, A., Schmitz, O., Kristensen, J. S., Frandsen, K. B., Bayer, Th., Müller, P., Dunning, B. E., Paladini, S., Gutierrez, C., Deacon, R., Valentin, M., Grunberger, G., Weston, W. M., Patwardhan, R., Rappaport, E. B., Sargeant, L. A., Wareham, N. J., Khaw, K. T., Zethelius, Björn, Lithell, Hans, Hales, C. Nicholas, Berne, Christian, Lakka, H.-M., Oksanen, L., Tuomainen, T.-P., Kontula, K., Salonen, J. T., Dekker, J. M., de Boks, P., de Vegt, F., Stehouwer, C. D. A., Nijpels, G., Bouter, L. M., Heine, R. J., Bruno, G., Cavallo-Perin, P., Bargero, G., D’Errico, N., Borra, M., Macchia, G., Pagano, G., Newton, R. W., Ruta, D. A., New, J. P., Wallace, C., Roxburgh, M. A., Young, R. J., Vaughan, N. J. A., Elliott, P., Brennan, G., Devers, M., MacAlpine, R., Steinke, D., Lawson, D. H., Decallonne, B., Casteels, K., Gysemans, C., Bouillon, R., Mathieu, C., Linn, Thomas, Strate, Christine, Schneider, Kerstin, Funda, D. P., Jirsa, M., Kozáková, H., Kaas, A., Kofronová, O., Tlaskalová-Hogenová, H., Buschard, K., Wanka, H., Hartmann, A., Kuttler, B., Rasmussen, S. B., Sørensen, T. S., Markholst, H., Petersen, J. S., Karounos, D., Dyrberg, T., Mabley, J. G., Haskó, G., Szabó, C., Seissler, J., Nguyen, T. B. T., Steinbrenner, H., Scherbaum, W. A., Cipriani, R., Gabriele, A., Sensi, M., Guidobaldi, L., Pantellini, F., Cerrito, M. G., Scarpa, S., Di Mario, U., Morano, S., Ceolotto, G., Iori, E., Baritono, E., Del Prato, S., Semplicini, A., Trevisan, R., Zerbini, G., Meregalli, G., Asnaghi, V., Tentori, F., Maestroni, A., Mangili, R., Marescotti, C., Vedovato, M., Tiengo, A., Tadjieva, J., Mankovsky, B. N., Van Aken, S., Raes, A., Vande Walle, J., Matthys, D., Craen, M., Hansen, H. P., Lund, S. S., Rossing, P., Jensen, T., Parving, H.-H., Andersen, S., Tarnow, L., Hansen, B. V., Trautner, C., Haastert, B., Ennenbach, N., Willich, S., Tabák, Á. Gy., Orchard, T. J., Spranger, J., Preissner, K. T., Schatz, H., Pfeiffer, A., Cantón, A., Burgos, R., Hernández, C., Lecube, A., Mesa, J., Segura, R. M., Mateo, C., Simó, R., Fathallah, L., Greene, D. A., Obrosova, I., Gilbert, R. E., Kelly, D. J., Cox, A. J., Berka-Wilkinson, J. L., Taylor, H. R., Panagiotopoulos, S., Lee, V., Jerums, G., Cooper, M. E., Hitman, G. A., Aganna, E., Ogunkolade, W. B., Rema, M., Deepa, R., Shanthi-Rani, C. S., Barakat, K., Kumarajeewa, T. R., Cassell, P. G., McDermott, M. F., Mohan, V., Ways, K., Bursell, S., Devries, T., Woodworth, J., Alatorre, C., King, G., Aiello, L. P., Karisen, A. E., Pavlovic, D., Nielsen, K., Jensen, J., Andersen, H. U., Pociot, F., Mandrup-Poulsen, T., Eizirik, D. L., Nerup, J., Lortz, S., Tiedge, M., Lenzen, S., Lally, F. J., Bone, A. J., Darville, M. I., Ho, Y.-S., Sternesjö, J., Sandler, S., Chen, M.-C., Schuit, F., Pipeleers, D. G., Merezak, S., Hardikar, A., Hoet, J. J., Remacle, C., Reusens, B., Bréant, B., Garofano, A., Czernichow, P., Kubota, N., Terauchi, Y., Miki, H., Tamemoto, H., Yamauchi, T., Nakano, R., Komeda, K., Eto, K., Tobe, K., Kimura, S., Kadowaki, T., Ide, T., Murakami, K., Tsunoda, M., Mochizuki, T., Ozanne, S. E., Nave, B. T., Wang, C. L., Dorling, M. W., Petry, C. J., Koopmans, S. J., van der Bent, C., Que, I., Radder, J. K., Sebokova, E., Sana, A. K., Klimes, I., Ruderman, N., Morviducci, L., Pastore, L., Morelli, S., Sagratella, E., Zorretta, D., Buongiomo, A., Tamburrano, G., Giaccari, A., Martinenghi, Sabina, De Angelis, Gabriella Cusella, Ravasi, Flavio, Bifari, Francesco, Bordignon, Claudio, Falqui, Luca, Kessler, A., Dransfeld, O., Sasson, S., Tomas, E., Zorzano, A., Eckel, J., Thorsby, P., Rosenfalck, A. M., Kjems, L., Hanssen, K. F., Madsbad, S., Birkeland, K. I., Hamilton-Wessler, M., Markussen, J., Bergman, R. N., Melki, V., Hanaire-Broutin, H., Bessières-Lacombe, S., Tauber, J.-P., Home, P. D., Lindholm, A., Riis, A., Rosenstock, J., Schwartz, S., Clark, C., Edwards, M., Donley, D., Swift, P., Mortensen, H. B., Lynggaard, H., Hougaard, P., Cull, C. A., Neil, H. A. W., Frighi, V., Manley, S. E., Holman, R. R., Turner, R. C., Steiner, G., Davis, W. A., Weeraratna, T., Bruce, D. G., Davis, T. M. E., Vergès, B., Duvillard, L., Pont, F., Florentin, E., Gambert, Ph., Benko, B., Ljubić, S., Turk, Z., Granić, M., März, W., Wollschläger, H., Klein, G., Neiss, A., Wehling, M., Huxtable, S. J., Saker, P. J., Walker, M., Frayling, T. M., Levy, J. C., O’Rahilly, S., Hattersley, A. T., McCarthy, M. I., Orecchio, A., Giacchini, A., Dominici, R., Canettieri, G., Trinti, B., Zani, M., Andreoli, M., Sciacchitano, S., de Silva, A. M., Whitecross, K., Pasco, J., Kotowicz, M., Nicholson, G., Zimmet, P., Boyko, E. J., Collier, G. R., Frittitta, L., Pizzuti, A., Argiolas, A., Graci, S., Goldfine, I. D., Bozzali, M., Ercolino, T., Costanzo, B., Iacoviello, L., Tassi, V., Trischitta, V., Wauters, M., Rankinen, T., Mertens, I., Chagnon, M., Bouchard, C., Van Gaal, L., Sivenius, K., Valve, R., Hakkarainen, V., Niskanen, L., Laakso, M., Uusitupa, M., Beridze, N., Japaridze, M., Kurashvili, R., Dundua, M., Kebuladze, G., Kazakhashvili, N., Offley-Shore, B., Thomas, B., Ghebremeskel, K., Crawford, M., Lowy, C., Eriksson, Ulf J., Martin Simán, C., Wisse, Bert, Gittenberger-de Groot, Adriana C., Wentzel, P., Eriksson, U. J., Wender-Ożegowska, E., Drews, K., Biczysko, R., Bronisz, A., Rość, D., Graczykowska-Koczorowska, A., Kotschy, M., Sokup, A., Kohnert, K. D., Besch, W., Strese, J., Frick, U., Zander, E., Kemer, W., Škrha, J., Kvasnička, J., Kalvodová, B., Hilgertová, J., Schatteman, K., Goossens, F., Scharpé, S., De Leeuw, I., Hendriks, D., Legakis, I. N., Panayiotou, D., Mountokalakis, Th. D., Enderle, M. D., Beckmann, P., Balletshofer, B., Rittig, K., Maerker, E., Volk, A., Meisner, C., Jacob, S., Matthaei, S., Häring, H. U., Rett, K., Ueda, K., Nakagawa, T., Shimajiri, Y., Kokawa, M., Matsumoto, E., Sasaki, H., Sanke, T., Nanjo, K., McKinnon, Caroline M., Macfarlane, Wendy M., Docherty, Kevin, Furukawa, N., Shirotani, T., Kishikawa, H., Kaneko, K., Araki, E., Shichiri, M., Prentki, M., Roduit, R., Susini, S., Buteau, J., Ejrnæs, A. M., Andersen, N. Aa., Osterhoff, M., Möhlig, M., Ortmann, J., Bikashaghi, F., Mayer, C., Bikashagi, F., Ackermans, M. T., Pereira Arias, A. M., Bisschop, P. H. L. T., Endert, E., Sauerwein, H. P., Romijn, J. A., Gastaldelli, A., Baldi, S., Pettiti, M., Natali, A., Frascerra, S., Camastra, S., Toschi, E., Ferrannini, E., Stingl, H., Krssak, M., Bischof, M. G., Krebs, M., Fürnsinn, C., Nowotny, P., Waldhäusl, W., Roden, M., Neeft, M., Meijer, A. J., Båvenholm, P., Pigon, J., Efendic, S., Kästenbauer, T., Sauseng, S., Sokol, G., Auinger, M., Irsigler, K., Abbott, C. A., Carrington, A. L., Faragher, B., Kulkarni, J., Van Ross, E. R. E., Boulton, A. J. M., Armstrong, D. G., Hadi, S., Nguyen, H. C., Harkless, L. B., Jirkovská, A., Kasalicky, P., Hosová, J., Skibova, J., Uccioli, L., Caselli, A., Giacomozzi, C., Macellari, V., Giurato, L., Lardieri, L., Menzinger, G., Pham, H. T., Rosenblum, B. I., Lyons, T. E., Giurini, J. M., Smakowski, P., Chrzan, J. S., Habershaw, G. M., Veves, A., Foster, A. M., Bates, M., Doxford, M., Edmonds, M. E., Kecha, O., Winkler, R., Martens, H., Collette, J., Lefèbvre, P. J., Greiner, D., Geenen, V., Atlan-Gepner, C., Naspetti, M., Valéro, R., Barad, M., Lepault, F., Vialettes, B., Naquet, P., de Galan, B., Netea, M. G., Hancu, N., Smits, P., Van der Meer, J. W. M., Osterbye, T., Jørgensen, K. H., Tranum-Jensen, J., Fredman, P., Høy, M., Bokvist, K., Olsen, H. L., Horn, T., Gromada, J., Laub, R., Lohmann, T., Hahn, H. J., Adler, T., Emmrich, F., Rabuazzo, A. M., Lupi, R., Dotta, F., Patanè, G., Marselli, L., Realacci, M., Piro, S., Del Guerra, S., Santangelo, C., Navalesi, R., Purrello, F., Marchetti, P., de Vos, P., Visser, L., de Haan, B. J., Klok, P., van Schilfgaarde, R., Poppema, S., Juang, J.-H., Kuo, C.-H., Hsu, B. R.-S., Nacher, V., Pérez, M., Biarnés, M., Raurell, M., Soler, J., Montanya, E., Ritzel, R., Maubach, J., Büsing, M., Becker, T., Klempnauer, J., Hücking, K., Schmiegel, W. H., Nauck, M. A., Bouček, P., Saudek, F., Adamec, M., Kožitarová, R., Jedináková, T., Vlasáková, Z., Skibová, J., Bartoš, V., Maffi, P., Bertuzzi, F., Aldrighetti, L., Taglietti, M. V., Castelnuovo, A., Pozza, G., Di Carlo, V., Secchi, A., Renier, G., Mamputu, J.-C., Gillespie, J. S., McMaster, D., Mercer, C., Trimble, E. R., Lecomte, M., Véricel, E., Paget, C., Ruggiero, D., Lagarde, M., Wiernsperger, N., Pricci, F., Leto, G., Amadio, L., Cordone, S., Iacobini, C., Catalano, S., Violi, F., Rotella, C. M., Pugliese, G., Zicari, A., Gradini, R., Sale, P., Pala, L., Cresci, B., Giannini, S., Manuelli, C., Dahlfors, G., Arnqvist, H. J., Gonelle-Gispert, C., Halnan, P. A., Sadoul, K., Wolter, S., Lang, J., Niwa, T., Yu, W., Hidaka, H., Senda, T., Niki, I., Fukasawa, T., Renstrom, E., Barg, S., Seward, E., Rorsman, P., Rutter, G. A., Molinete, M., Lilla, V., Ravazzola, M., Halban, P. A., Efanov, A. M., Bertorello, A. M., Zaitsev, S. V., Zwiller, J., Berggren, P.-O., MŞengül, A., Salman, F., Sargrn, M., Özer, E., Karşidaǧ, K., Salman, S., Gedik, S., Satman, İ., Dinççaǧ, N., Yılmaz, M. T., Lloyd, A., Hopkinson, P. K., Testa, M. A., Blonde, L., Turner, R. R., Hayes, J., Simonson, D. C., van der Ven, N. C. W., Lubach, C. H. C., Snoek, F. J., Mollema, E. D., van der Ploeg, H. M., Danne, T., Hoey, H., McGee, H., Fitzgerald, H., Lernmark, B., Thernlund, G., Fredin, K., Hägglöf, B., Lugari, R., Dell’Anna, C., Ugolotti, D., Dei Cas, A., Barilli, A. L., Sard, L., Marani, B., Iotti, M., Zandomeneghi, R., Gnudi, A., Kjems, L. L., Volund, Aa., Toft-Nielsen, M., Damholt, M. B., Hilsted, L., Hughes, T. E., Krarup, T., Holst, J. J., Young, A., Gottlieb, A., Fineman, M., Kolterman, O., Cancelas, J., García-Martínez, J. A., Villanueva-Peñacarrillo, M. L., Valverde, I., Malaisse, W. J., Filipsson, K., Ahrén, B., Balkan, B., Kwasnik, L., Battle, B., Li, X., Egan, J. M., Clocquet, A. R., Elahi, D., Petrella, E., Pricket, K., Petersen, K. F., Sullivan, J. T., Amatruda, J. M., Livingston, J. N., Shulman, G. I., Freyse, E.-J., Knospe, S., Glund, K., Demuth, H.-U., Walker, D., Malik, R. A., Reljanovic, M., Barada, A., Milicevic, Z., Tack, Cees J., Goldstein, David S., Van Huysen, C., Stevens, M. 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L., Srivatsa, A., Anderson, S. G., Cruikshank, J. K., Florkowski, C. M., Scott, R. S., Graham, P. J., Moir, C. L., Flores, C., Ruggenenti, P., Dodesini, A. R., Vasile, B., Gaspari, F., Arnoldi, F., Ferrari, S., Ciocca, I., Spalluzzi, A., Remuzzi, G., Delvigne, C., Ballaux, D., Bosman, D. R., Winkler, A. S., Marsden, J., Watkins, P. J., Strutton, D., Erbey, J. R., Jacobsen, P., Rossing, K., Jensen, J. S., Mansfield, M. W., Kowalska, I., Telejko, B., Bachórzewska-Gajewska, A., Prokop, J., Kochman, W., Musiał, W., Naskręt, D., Oleksa, R., Zozulińska, D., Sowiński, J., Wierusz-Wysocka, B., Klamann, A., Jonas, M., Müller-Lung, U., Heuser, L., Launhardt, V., Valensi, P., Pariès, J., Torremocha, F., Brulport, V., Sachs, R. N., Vanzetto, G., Levy, M., Lormeau, B., Halimi, S., Perfornis, A., Boumal, D., Zimmermann, C., Bernard, Y., Sabbah, A., Meneveau, N., Gautier, S., Bassand, J. P., Anděl, M., Kraml, P., Potočková, J., Dvořáková, H., Trešlová, L., Nuttall, S. L., Martin, U., Kendall, M. J., Schiaffini, R., Pantaleo, A., Battocletti, T., Vaccari, V., Brufani, C., Martuscelli, E., Gargiulo, P., Nieszner, E., Posa, I., Kocsis, E., Préda, I., Pogatsa, G., Koltai, M. Z. S., Stefanidis, A., Manoussakis, S., Handanis, S., Zairis, M., Vitalis, D., Dadiotis, L., Fiorina, P., La Rocca, E., Astorri, E., Rossetti, C., Lucignani, G., Giudici, D., Castoldi, R., Mazarakis, N., Giagiakou, E., Karavidas, A., Agellou, A., Karamani, O., Matsakas, E., Caviezel, F., Morricone, L., Ranucci, M., Denti, S., Cazzaniga, A., Enrini, R., Isgrò, G., González de Molina, F. J., Sala, J., Masià, R., Marrugat, J., Kruszewski, P., Wolnik, B., Bieniaszewski, L., Świerblewska, E., Semetkowska-Jurkiewicz, E., Krupa-Wojciechowska, B., Vasilikos, P. G., Alaveras, A. E. G., Anastasopoulos, N. G., Chala, E., Sidira, M., Christakopoulos, P. D., Poulsen, P. L., Hansen, K. W., Ebbehøj, E., Knudsen, S. T., Mogensen, C. E., Ramu, Y., Vidyullatha, Y., Strojek, K., Gorska, J., Morawin, E., Ritz, E., Ciavarella, A., Malini, P. L., Strocchi, E., Fiumi, N., Ambrosioni, E., Idzior-Waluś, B., Stevens, L., McEneny, J., O’Kane, M. J., Moles, K. W., McMaster, C., Young, I. S., Leonhardt, W., Konstadelou, E., Gürlek, Alper, Soedamah-Muthu, S., Taskinen, M. R., Ehnholm, C., Wägner, A., Bayen, Laia, Rigla, M., Ortega, E., Caixàs, A., Mestrón, A., Ordóñez, J., Pérez, A., Sotiropoulou, G., Servais, P. L., Bertolotto, A., Pilo, M., Suchánková, G., Andratschke, S., Tschöp, M., Strasburger, C.-J., Rizzo, L., Aerts, P., Vinckx, M., Ansquer, J. C., Ryan, M., Buter, H., Navis, G. J., de Jong, P. E., de Zeeuw, D., Carreras, G., Giménez, G., Pou, J. M., Howorka, K., Gabriel, M., Pumprla, J., Köves, A., Bhowmik, N. B., Haque, A., Rahman, A., Paleari, F., Gamba, P., Mauri, G., Rovaris, G., Giannattasio, C., Piatti, M. L., Zincone, A., Cavaletti, G., Mancia, G., Lan, S., Arezzo, J., Gerber, R. A., Klioze, S. S., Saponara, C., Tartaglione, T., Cercone, S., Caputo, S., Meloni, T., Brunetti, D., Di Lazzaro, V., Xu, G., Jiang, H. Y., Shy, M. E., Sugimoto, K., Zhang, W.-X., Kuchmerovskaya, T., Donchenko, G., Shymansky, I., Kuchmerovsky, N., Pakyrbaeva, L., Cameron, N. E., Keegan, A., Cotter, M. A., Mirrlees, D., Smale, S. E., Biessels, G. J., Duis, S. E. J., Kamal, A., Gispen, W. H., Carrington, A., Carman, S., Smiarowski, H., Lavoie, D., Sawicki, D., Sabetta, A., Litchfield, J., Van Zandt, M., Sredy, J., Smirnova, V., Strokov, I., Ivanova, L., Ichunina, A., Nakamura, J., Nakayama, M., Hamada, Y., Chaya, S., Kato, K., Kasuya, Y., Mizubayashi, R., Miwa, K., Yasuda, Y., Kamiya, H., Hotta, N., Bíró, K., Kukorelli, T., Szilágyi, N., Kürthy, M., Komáromy, A., Mogyorosi, T., Nagy, K., Çakir, M., Baskal, N., Güllü, S., Elhan, A. H., Erdogan, G., Ziegler, D., Piolot, R., Neubauer, J., Senesi, B., Bonetti, R., Napolitano, A., Canepa, F., Ottonello, P., Schabmann, A., Giménez-Pérez, G., Arroyo, J. A., López, T., Ponz, E., Mauricio, D., Diem, P., Zanchin, L., Suter, S. L., Lefrandt, J. D., Smit, A., van Roon, A. M., Dullaart, R., Voita, D., Mackevics, V., Vitols, A., Lengyel, Cs., Farkas, Gy., Török, T., Légrády, P., Várkonyi, T. T., Kardos, A., Gingl, Z., Kempler, P., Rudas, L., Lonovics, J., Marchand, M., Stevens, L. K., Tarnás, Gy., Estrella, F., Christensen, N. J., Keresztes, K., Barna, I., Hermányi, Zs., Vargha, P., Bonnevie, L., Chanudet, X., Larroque, P., Tutuncu, N. Bascil, Deger, A., Batur, M. K., Yildirir, A., Onalan, O., Aksöyek, S., Kabakçι, G., Erbaş, T., Galicka-Latała, D., Surdacki, A., Gerritsen, J., TenVoorde, B. J., Heethaar, R. M., Tagawa, T. S., Kodama, M., Yoshioka, R., Yamasaki, Y., Didangelos, T., Athyros, V., Kontopoulos, A., Papageorgiou, A., Karamitsos, D., Lacigová, S., Rušavý, Z., Kárová, R., Perrild, H., Kay, L., Jørgensen, T., Bień, A. I., Witek, P., Geraldes, Elizabete, Rodrigues, D., Pereira, L., Doménech, A., Leitão, P., Anagnostopoulos, D., Foster, A. V. M., Nag, S., Barsoum, M., Lewis, G., Dunlop, N., Connolly, V., Bilous, R., Kelly, W., Chantelau, E., Gede, A., Sharman, D., O’Halloran, D., Best, C., Abbas, Z. G., Lutale, J., Gill, G. V., Jarvis, W. R., Archibald, L. K., Corcoran, S., Mansell, J., Pibworth, L., Terada, H., Shiba, T., Utugi, N., Utugi, T., Blum, M., Strobel, J., Höffken, K., Razvi, F. M., Kritzinger, E. E., Taylor, K., Jones, S., Illahi, W., Grüβer, M., Hartmann, P., Hoffstadt, K., van Leiden, H. A., Moll, A. C., Polak, B. C. P., Pietragalla, G. B., Maurino, M., Montanaro, M., Karadeniz, Ş., Tommasini, P., Quadrini, C., Demiraj, V., Rispoli, E., Ota, A., Takama, H., Saito, N., Hemández, C., Lepore, D., Antico, L., Giardina, B., Franconi, F., Michoud, E., Chamot, S., Riva, Ch., Hammes, H.-P., Renner, O., Breier, G., Lin, J., Alt, A., Betzholtz, C., Bretzel, R. G., Manti, R., Gallo, M., Molinar Hin, A., Brignardello, E., Boccuzzi, G., Li, Shanfang, Xiang, Kunsan, Zhang, Rugeng, Shangguan, Xinhong, Wu, Jianrong, Donnan, P. T., Broomhall, J., Hunter, K., Morris, A. D., Ioannidis, G., Peppa, M., Rontogianni, E., Kallifronas, M., Lekatsas, I., Chrysanthopoulou, G., Anthopoulos, L., Kesse, M., Thalassinos, N., Neves, C., Medina, J. L., Lopes, F., Yılmaz, M., Güvener, N., Güvener, M., Kocagöz, T., Böke, E., Paşaoglu, I., Bascil Tutuncu, N., Oto, A., Karvonen, M. K., Koulu, M., Pesonen, U., Mercuri, M., Rauramaa, R., Rutter, M. K., Kestevan, P., McComb, J. M., Marshall, S. M., Sobieska, M., Wiktorowicz, K., Kanters, S. D. J. M., Banga, J. D., Algra, A., Frijns, C. J. M., Beutler, J. J., Fijnheer, R., Nicoloff, G., Baydanoff, S., Stanimirova, N., Petrova, Ch., Lario, S., Campistol, J. M., Cases, A., Clària, J., Iñigo, P., Esmatjcs, E., Sármán, B., Tóth, M., Kocsis, I., Somogyi, A., Bumbure, A., Jachimowicz, K., Samson, J., Tomasiak, M., Sobol, A., Stańczyk, L., Watala, C., Stradina, P., Wiśniewska-Jarosińska, M., Marciniak, D., Więcławska, B., Watała, C., Golański, J., Zinnat, R., Mahmud, I., Büyükasik, Yahya, Demiroğlu, H., Szczepanik, A., Skowroński, M., Murawska, A., Meeking, D. R., Allard, S., Munday, J., Chowienczyk, P., Shaw, K. M., Cummings, M. H., Šimková, R., Jirsa, M., Hadoke, P. W. F., McIntyre, C. A., Jones, G. C., Williams, B. C., Elliott, A. I., McKnight, J. A., Pernow, J., Bombonato, G. C., Finucci, G. F., Zotta, L., Senses, V., Ozyazgan, S., Ince, E., Tunçdemir, M., Oztürk, M., Sultuybek, G., Akkan, A. G., Özyazgan, S., Unlücerci, Y., Bekpınar, S., Meyer, M. F., Lee, B. C., Shore, A. C., Humphreys, J. M., Tooke, J. E., Dell’Omo, G., Giovannitti, G., Caricato, F., Mariani, M., Pedrinelli, R., Kiviet-Boehm, C., Schwelling, V., Matthäei, S., Pfohl, M., McInerney, D., Itoh, H., Ohno, T., Katoh, N., Baumgartner-Parzer, S., Artwohl, M., Graier, W., Ludwig, C., Tachi, Y., Bannai, C., Shinohara, M., Shimpuku, H., Ohura, K., Bertacca, A., Sasvári, M., Szaleczki, E., Pusztai, P., Boes, U., Klaus, E., Dittrich, P., Wagner, Z., Wittmann, I., Pótó, L., Wagner, L., Mazák, I., Nagy, J., Feletto, F., Taboga, C., Tonutti, L., Lizzio, S., Russo, A., Selmo, V., Ceriello, A., Lekakis, J., Papamichael, C. M., Stamatelopoulos, K., Stamatelopoulos, S., Yillar, D. O., Gay, M., Lillaz, E., Passaro, A., Vanini, A., Calzoni, F., D’Elia, K., Carantoni, M., Zuliani, G., Fellin, R., Solini, A., Chwatko, G., Bald, E., Dramais, A.-S., Wallemacq, P. E., Vandeleene, B., Ciaria, M. V., Ariano, M., Strom, R., Gibney, J., Weiss, U., Turner, B., O’Gorman, P., Watts, G., Powrie, J., Crook, M., Shaw, K., and Cummings, M.
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- 1999
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23. Beta-cell function in severely obese type 2 diabetic patients: long-term effects of bariatric surgery.
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Camastra S, Manco M, Mari A, Greco AV, Frascerra S, Mingrone G, and Ferrannini E
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- 2007
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24. Insulin action and non-esterified fatty acids
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Ferrannini, E., Camastra, S., Coppack, S. W., Fliser, D., Golay, A., Mitrakou, A., Ferrannini, E., Camastra, S., Coppack, S. W., Fliser, D., Golay, A., and Mitrakou, A.
25. Expression of thyrotropin and thyroid hormone receptors in the adipose tissue of patients with morbid obesity and/or type 2 diabetes: effects of weight loss.
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Nannipieri, M., Cecchetti, F., Anselmino, M., Camastra, S., Nicolini, P., Lamacchia, M., Rossi, M., Iervasi, G., and Ferrannini, E.
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DATA - Abstract
A correction to the article "Expression of thyrotropin and thyroid hormone receptors in the adipose tissue of patients with morbid obesity and/or type 2 diabetes: Effects of weight loss," that was published in a previous issue of the journal is presented.
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- 2010
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26. Visceral Adiposity as the Main Determinant of Carotid Stiffness in a Healthy Population With a Wide BMI and Age Range: Evidence From an Echo-Tracking Approach.
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Guerra, E., Malshi, E., Morizzo, C., Kozakova, M., Camastra, S., Muscelli, E., Palombo, C., and Ferrannini, E.
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CAROTID artery ,OBESITY - Abstract
The article talks about the studies on determinants of carotid artery stiffness and the findings regarding visceral adiposity.
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- 2007
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27. Both 3,5-diiodo-L-thyronine (T2) and T3 modulate glucose-induced insulin secretion
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Fallahi, Poupak, Ferrari, SILVIA MARTINA, Santini, E., Camastra, Stefania, Frenzilli, Giada, Puccini, Marco, Goglia, F., Lanni, A., Marchetti, Piero, Antonelli, Alessandro, Fallahi, P, Ferrari, S. M, Santini, E, Camastra, S, Frenzilli, G, Puccini, M, Goglia, F, Lanni, A, Marchetti, P, and Antonelli, A.
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Islet ,Dose-Response Relationship, Drug ,Diiodothyronines ,Diiodothyronine, INS-le Insulin secretion, Islets ß-cells, Triiodothyronine ,Rats ,ß-cell ,Glucose ,Islets ß-cells ,Cell Line, Tumor ,Insulin-Secreting Cells ,Insulin Secretion ,Animals ,Humans ,Insulin ,Triiodothyronine ,INS-le Insulin secretion ,INS-le ,Diiodothyronine - Abstract
3,5-diiodo-L-thyronine (T2), a naturally existing iodothyronine, has biological effects on humans, but no information is available on its action on pancreatic b-cells. We evaluated its effect vs triiodothyronine (T3), on glucose-induced insulin secretion in INS-1e cells, a rat insulinoma line, and on human islets. INS-1e were incubated in the presence/absence of T2 or T3 (0.1 nmol/L-10 μmol/L), and glucose (3.3, 7.5, 11.0, and 20 mmol/L). Insulin release and content (at 11.0 and 20 mmol/L glucose) were significantly (p less than 0.01) stimulated by 1-100 nmol/L T2 and 0.1 nmol/L-1.0 μmol/L T3, and inhibited with higher concentrations of both (110 μmol/L T2 and 10 μmol/L T3). Human islets were incubated with 3.3 mmol/L glucose in presence/absence of T3 or T2 (0.1 nmol/L, 0.1 μmol/L, and 1 μmol/L). T2 (0.1 nmol/L-0.1 μmol/L) significantly (p less than0.01) stimulated insulin secretion, while higher concentrations (1 μmol/L) inhibited it. A modest increase in insulin secretion was evidenced with 1 μmol/L T3. In conclusion, T2 and T3 have a direct regulatory role in insulin secretion, depending on their concentrations and the glucose level itself. At concentrations near the physiological range, T2 enhances glucose-induced insulin secretion in both rat b-cells and human islets. 3,5-diiodo-L-thyronine (T-2), a naturally existing iodothyronine, has biological effects on humans, but no information is available on its action on pancreatic (beta-cells. We evaluated its effect vs triiodothyronine (T-3), on glucose -induced insulin secretion in INS -le cells, a rat insulinoma line, and on human islets. INS le were incubated in the presence/absence of T-2 or T-3 (0.1 nmol/L-10 mu mol/L), and glucose (3.3, 7.5, 11.0, and 20 mmol/L). Insulin release and content (at 11.0 and 20 mmol/L glucose) were significantly (p< 0.01) stimulated by 1-100 nmol/L T-2 and 0.1 nmoUL-1.0 mu mol/L T-3, and inhibited with higher concentrations of both (1-10 gmoUL T-2 and 10 mu mol/L T-3). Human islets were incubated with 3.3 mmol/L glucose in presence/absence of T-3 or T-2 (0.1 nmol/L, 0.1 mu mol/L, and 1 mu mol/L). T-2 (0.1 nmol/L-0.1 mu mol/L) significantly (p< 0.01) stimulated insulin secretion, while higher concentrations (1 mu mol/L) inhibited it. A modest increase in insulin secretion was evidenced with 1 mu mol/L T-3. In conclusion, T-2 and T-3 have a direct regulatory role in insulin secretion, depending on their concentrations and the glucose level itself. At concentrations near the physiological range, T-2 enhances glucose-induced insulin secretion in both rat beta-cells and human islets.
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- 2017
28. Position statement of Italian Society of Obesity (SIO): Gestational Obesity.
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Barrea L, Camastra S, Garelli S, Guglielmi V, Manco M, Velluzzi F, Barazzoni R, Verde L, and Muscogiuri G
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- Humans, Female, Pregnancy, Italy, Pregnancy in Obesity complications, Obesity therapy, Societies, Medical, Body Mass Index, Pregnancy Complications therapy
- Abstract
Purpose: Gestational obesity (GO) presents a multifaceted challenge to maternal and fetal health, with an escalating prevalence and far-reaching consequences extending beyond pregnancy. This perspective statement by the Italian Society of Obesity (SIO) provides current insights into the diagnosis, maternal and fetal impacts, and treatment strategies for managing this pressing condition., Methods: This article provides a comprehensive review of the maternal and fetal effects of GO and provides suggestions on strategies for management. Comprehensive review was carried out using the MEDLINE/PubMed, CINAHL, EMBASE, and Cochrane Library databases., Results: The diagnosis of GO primarily relies on pre-pregnancy body mass index (BMI), although standardized criteria remain contentious. Anthropometric measures and body composition assessments offer valuable insights into the metabolic implications of GO. Women with GO are predisposed to several health complications, which are attributed to mechanisms such as inflammation and insulin resistance. Offspring of women with GO face heightened risks of perinatal complications and long-term metabolic disorders, indicating intergenerational transmission of obesity-related effects. While nutritional interventions are a cornerstone of management, their efficacy in mitigating complications warrants further investigation. Additionally, while pharmacological interventions have been explored in other contexts, evidence on their safety and efficacy specifically for GO remains lacking, necessitating further investigation., Conclusion: GO significantly impacts maternal and fetal health, contributing to both immediate and long-term complications. Effective management requires a multifaceted approach, including precise diagnostic criteria, personalized nutritional interventions, and potential pharmacological treatments. These findings underscore the need for individualized care strategies and further research to optimize outcomes for mothers and their offspring are needed. Enhanced understanding and management of GO can help mitigate its intergenerational effects, improving public health outcomes., Level of Evidence: Level V narrative review., (© 2024. The Author(s).)
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- 2024
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29. Hepatic FoxOs link insulin signaling with plasma lipoprotein metabolism through an apolipoprotein M/sphingosine-1-phosphate pathway.
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Izquierdo MC, Shanmugarajah N, Lee SX, Kraakman MJ, Westerterp M, Kitamoto T, Harris M, Cook JR, Gusarova GA, Zhong K, Marbuary E, O-Sullivan I, Rasmus N, Camastra S, Unterman TG, Ferrannini E, Hurwitz BE, and Haeusler RA
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- Animals, Lipoproteins, HDL metabolism, Mice, Apolipoproteins M genetics, Apolipoproteins M metabolism, Forkhead Transcription Factors genetics, Forkhead Transcription Factors metabolism, Insulin metabolism, Liver metabolism, Lysophospholipids metabolism, Sphingosine analogs & derivatives, Sphingosine metabolism
- Abstract
Multiple beneficial cardiovascular effects of HDL depend on sphingosine-1-phosphate (S1P). S1P associates with HDL by binding to apolipoprotein M (ApoM). Insulin resistance is a major driver of dyslipidemia and cardiovascular risk. However, the mechanisms linking alterations in insulin signaling with plasma lipoprotein metabolism are incompletely understood. The insulin-repressible FoxO transcription factors mediate key effects of hepatic insulin action on glucose and lipoprotein metabolism. This work tested whether hepatic insulin signaling regulates HDL-S1P and aimed to identify the underlying molecular mechanisms. We report that insulin-resistant, nondiabetic individuals had decreased HDL-S1P levels, but no change in total plasma S1P. This also occurred in insulin-resistant db/db mice, which had low ApoM and a specific reduction of S1P in the HDL fraction, with no change in total plasma S1P levels. Using mice lacking hepatic FoxOs (L-FoxO1,3,4), we found that hepatic FoxOs were required for ApoM expression. Total plasma S1P levels were similar to those in controls, but S1P was nearly absent from HDL and was instead increased in the lipoprotein-depleted plasma fraction. This phenotype was restored to normal by rescuing ApoM in L-FoxO1,3,4 mice. Our findings show that insulin resistance in humans and mice is associated with decreased HDL-associated S1P. Our study shows that hepatic FoxO transcription factors are regulators of the ApoM/S1P pathway.
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- 2022
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30. Nutrients handling after bariatric surgery, the role of gastrointestinal adaptation.
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Camastra S, Palumbo M, and Santini F
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- Blood Glucose metabolism, Gastrectomy, Gastrointestinal Tract metabolism, Humans, Nutrients, Bariatric Surgery, Gastric Bypass
- Abstract
Bariatric surgery determines a rearrangement of the gastrointestinal tract that influences nutrient handling and plays a role in the metabolic changes observed after surgery. Most of the changes depend on the accelerated gastric emptying observed in Roux-en-Y gastric bypass (RYGB) and, to a lesser extent, in sleeve gastrectomy (SG). The rapid delivery of meal into the jejunum, particularly after RYGB, contributes to the prompt appearance of glucose in peripheral circulation. Glucose increase is the principal determinant of GLP-1 increase with the consequent stimulation of insulin secretion, the latter balanced by a paradoxical glucagon increase that stimulates EGP to prevent hypoglycaemia. Protein digestion and amino acid absorption appear accelerated after RYGB but not after SG. After RYGB, the adaptation of the gut to the new condition participates to the metabolic change. The intestinal transit is delayed, the gut microbioma is changed, the epithelium becomes hypertrophic and increases the expression of glucose transporter and of the number of cell secreting hormones. These changes are not observed after SG. After RYGB-less after SG-bile acids (BA) increase, influencing glucose metabolism probably modulating FXR and TGR5 with an effect on insulin sensitivity. Muscle, hepatic and adipose tissue insulin sensitivity improve, and the gut reinforces the recovery of IS by enhancing glucose uptake and through the effect of the BA. The intestinal changes observed after RYGB result in a light malabsorption of lipid but not of carbohydrate and protein. In conclusion, functional and morphological adaptations of the gut after RYGB and SG activate inter-organs cross-talk that modulates the metabolic changes observed after surgery.Level of evidence Level V, narrative literature review., (© 2021. The Author(s).)
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- 2022
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31. Cytokines as Targets of Novel Therapies for Graves' Ophthalmopathy.
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Fallahi P, Ferrari SM, Elia G, Ragusa F, Paparo SR, Patrizio A, Camastra S, Miccoli M, Cavallini G, Benvenga S, and Antonelli A
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- Adrenal Cortex Hormones metabolism, Antibodies, Monoclonal, Humanized therapeutic use, Autoantibodies immunology, Chemokines therapeutic use, Fibroblasts metabolism, Graves Disease immunology, Humans, Hyperthyroidism metabolism, Immunoglobulins, Thyroid-Stimulating, Orbit metabolism, Randomized Controlled Trials as Topic, Receptor, IGF Type 1 metabolism, Receptors, Thyrotropin immunology, Rituximab therapeutic use, Thyroid Gland physiopathology, Cytokines metabolism, Graves Ophthalmopathy metabolism
- Abstract
Graves' disease (GD) is an organ-specific autoimmune disorder of the thyroid, which is characterized by circulating TSH-receptor (TSH-R) stimulating antibodies (TSAb), leading to hyperthyroidism. Graves' ophthalmopathy (GO) is one of GD extra-thyroidal manifestations associated with the presence of TSAb, and insulin-like growth factor-1 receptor (IGF-1R) autoantibodies, that interact with orbital fibroblasts. Cytokines are elevated in autoimmune (i.e., IL-18, IL-6) and non-autoimmune hyperthyroidism (i.e., TNF-α, IL-8, IL-6), and this could be associated with the chronic effects of thyroid hormone increase. A prevalent Th1-immune response (not related to the hyperthyroidism per se , but to the autoimmune process) is reported in the immune-pathogenesis of GD and GO; Th1-chemokines (CXCL9, CXCL10, CXCL11) and the (C-X-C)R3 receptor are crucial in this process. In patients with active GO, corticosteroids, or intravenous immunoglobulins, decrease inflammation and orbital congestion, and are considered first-line therapies. The more deepened understanding of GO pathophysiology has led to different immune-modulant treatments. Cytokines, TSH-R, and IGF-1R (on the surface of B and T lymphocytes, and fibroblasts), and chemokines implicated in the autoimmune process, are possible targets of novel therapies. Drugs that target cytokines (etanercept, tocilizumab, infliximab, adalimumab) have been tested in GO, with encouraging results. The chimeric monoclonal antibody directed against CD20, RTX, reduces B lymphocytes, cytokines and the released autoantibodies. A multicenter, randomized, placebo-controlled, double-masked trial has investigated the human monoclonal blocking antibody directed against IGF-1R, teprotumumab, reporting its effectiveness in GO. In conclusion, large, controlled and randomized studies are needed to evaluate new possible targeted therapies for GO., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Fallahi, Ferrari, Elia, Ragusa, Paparo, Patrizio, Camastra, Miccoli, Cavallini, Benvenga and Antonelli.)
- Published
- 2021
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32. Nutraceuticals in Thyroidology: A Review of in Vitro, and in Vivo Animal Studies.
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Benvenga S, Ferrari SM, Elia G, Ragusa F, Patrizio A, Paparo SR, Camastra S, Bonofiglio D, Antonelli A, and Fallahi P
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- Animals, Carnitine, Fatty Acids, Omega-3, Flavonoids, Humans, Inositol, Iodine, Melatonin, Resveratrol, Selenium, Vitamins, Zinc, Dietary Supplements adverse effects, Homeostasis, Thyroid Diseases prevention & control, Thyroid Gland physiology
- Abstract
Nutraceuticals are defined as a food, or parts of a food, that provide medical or health benefits, including the prevention of different pathological conditions, and thyroid diseases, or the treatment of them. Nutraceuticals have a place in complementary medicines, being positioned in an area among food, food supplements, and pharmaceuticals. The market of certain nutraceuticals such as thyroid supplements has been growing in the last years. In addition, iodine is a fundamental micronutrient for thyroid function, but also other dietary components can have a key role in clinical thyroidology. Here, we have summarized the in vitro, and in vivo animal studies present in literature, focusing on the commonest nutraceuticals generally encountered in the clinical practice (such as carnitine, flavonoids, melatonin, omega-3, resveratrol, selenium, vitamins, zinc, and inositol), highlighting conflicting results. These experimental studies are expected to improve clinicians' knowledge about the main supplements being used, in order to clarify the potential risks or side effects and support patients in their use.
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- 2020
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33. microRNA-205-5p is a modulator of insulin sensitivity that inhibits FOXO function.
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Langlet F, Tarbier M, Haeusler RA, Camastra S, Ferrannini E, Friedländer MR, and Accili D
- Subjects
- Adult, Animals, Diabetes Mellitus, Type 2 metabolism, Diet, High-Fat, Female, Forkhead Transcription Factors antagonists & inhibitors, Forkhead Transcription Factors genetics, Glucose biosynthesis, Hepatocytes metabolism, Humans, Insulin metabolism, Liver metabolism, Male, Mice, Mice, Inbred C57BL, Mice, Knockout, Mice, Obese, MicroRNAs metabolism, Middle Aged, Proto-Oncogene Proteins c-akt metabolism, Signal Transduction, Forkhead Transcription Factors metabolism, Insulin Resistance genetics, MicroRNAs genetics
- Abstract
Objectives: Hepatic insulin resistance is a hallmark of type 2 diabetes and obesity. Insulin receptor signaling through AKT and FOXO has important metabolic effects that have traditionally been ascribed to regulation of gene expression. However, whether all the metabolic effects of FOXO arise from its regulation of protein-encoding mRNAs is unknown., Methods: To address this question, we obtained expression profiles of FOXO-regulated murine hepatic microRNAs (miRNAs) during fasting and refeeding using mice lacking Foxo1, 3a, and 4 in liver (L-Foxo1,3a, 4)., Results: Out of 439 miRNA analyzed, 175 were differentially expressed in Foxo knockouts. Their functions were associated with insulin, Wnt, Mapk signaling, and aging. Among them, we report a striking increase of miR-205-5p expression in L-Foxo1,3a,4 knockouts, as well as in obese mice. We show that miR-205-5p gain-of-function increases AKT phosphorylation and decreases SHIP2 in primary hepatocytes, resulting in FOXO inhibition. This results in decreased hepatocyte glucose production. Consistent with these observations, miR-205-5p gain-of-function in mice lowered glucose levels and improved pyruvate tolerance., Conclusions: These findings reveal a homeostatic miRNA loop regulating insulin signaling, with potential implications for in vivo glucose metabolism., (Copyright © 2018 The Authors. Published by Elsevier GmbH.. All rights reserved.)
- Published
- 2018
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34. Publisher Correction: Muscle and adipose tissue morphology, insulin sensitivity and beta-cell function in diabetic and nondiabetic obese patients: effects of bariatric surgery.
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Camastra S, Vitali A, Anselmino M, Gastaldelli A, Bellini R, Berta R, Severi I, Baldi S, Astiarraga B, Barbatelli G, Cinti S, and Ferrannini E
- Abstract
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has not been fixed in the paper.
- Published
- 2018
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35. Muscle and adipose tissue morphology, insulin sensitivity and beta-cell function in diabetic and nondiabetic obese patients: effects of bariatric surgery.
- Author
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Camastra S, Vitali A, Anselmino M, Gastaldelli A, Bellini R, Berta R, Severi I, Baldi S, Astiarraga B, Barbatelli G, Cinti S, and Ferrannini E
- Subjects
- Adult, Female, Histocytochemistry, Humans, Insulin Resistance, Male, Middle Aged, Treatment Outcome, Adipose Tissue pathology, Bariatric Surgery, Diabetes Mellitus, Type 2 pathology, Insulin-Secreting Cells physiology, Muscles pathology, Obesity complications, Obesity pathology
- Abstract
Obesity is characterized by insulin-resistance (IR), enhanced lipolysis, and ectopic, inflamed fat. We related the histology of subcutaneous (SAT), visceral fat (VAT), and skeletal muscle to the metabolic abnormalities, and tested their mutual changes after bariatric surgery in type 2 diabetic (T2D) and weight-matched non-diabetic (ND) patients. We measured IR (insulin clamp), lipolysis (
2 H5 -glycerol infusion), ß-cell glucose-sensitivity (ß-GS, mathematical modeling), and VAT, SAT, and rectus abdominis histology (light and electron microscopy). Presurgery, SAT and VAT showed signs of fibrosis/necrosis, small mitochondria, free interstitial lipids, thickened capillary basement membrane. Compared to ND, T2D had impaired ß-GS, intracapillary neutrophils and higher intramyocellular fat, adipocyte area in VAT, crown-like structures (CLS) in VAT and SAT with rare structures (cyst-like) ~10-fold larger than CLS. Fat expansion was associated with enhanced lipolysis and IR. VAT histology and intramyocellular fat were related to impaired ß-GS. Postsurgery, IR and lipolysis improved in all, ß-GS improved in T2D. Muscle fat infiltration was reduced, adipocytes were smaller and richer in mitochondria, and CLS density in SAT was reduced. In conclusion, IR improves proportionally to weight loss but remains subnormal, whilst SAT and muscle changes disappear. In T2D postsurgery, some VAT pathology persists and beta-cell dysfunction improves but is not normalized.- Published
- 2017
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36. Increased Bile Acid Synthesis and Deconjugation After Biliopancreatic Diversion.
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Ferrannini E, Camastra S, Astiarraga B, Nannipieri M, Castro-Perez J, Xie D, Wang L, Chakravarthy M, and Haeusler RA
- Subjects
- Adult, Bile Acids and Salts blood, Blood Glucose, Cholesterol blood, Female, Glucose Clamp Technique, Humans, Male, Middle Aged, Bile Acids and Salts biosynthesis, Biliopancreatic Diversion, Diabetes Mellitus, Type 2 metabolism, Gastric Bypass
- Abstract
Biliopancreatic diversion (BPD) improves insulin sensitivity and decreases serum cholesterol out of proportion with weight loss. Mechanisms of these effects are unknown. One set of proposed contributors to metabolic improvements after bariatric surgeries is bile acids (BAs). We investigated the early and late effects of BPD on plasma BA levels, composition, and markers of BA synthesis in 15 patients with type 2 diabetes (T2D). We compared these to the early and late effects of Roux-en-Y gastric bypass (RYGB) in 22 patients with T2D and 16 with normal glucose tolerance. Seven weeks after BPD, insulin sensitivity had doubled and serum cholesterol had halved. At this time, BA synthesis markers and total plasma BAs, particularly unconjugated BAs, had markedly risen; this effect could not be entirely explained by low FGF19. In contrast, after RYGB, insulin sensitivity improved gradually with weight loss and cholesterol levels declined marginally; BA synthesis markers were decreased at an early time point (2 weeks) after surgery and returned to the normal range 1 year later. These findings indicate that BA synthesis contributes to the decreased serum cholesterol after BPD. Moreover, they suggest a potential role for altered enterohepatic circulation of BAs in improving insulin sensitivity and cholesterol metabolism after BPD., (© 2015 by the American Diabetes Association. Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered.)
- Published
- 2015
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37. Decreased expression of hepatic glucokinase in type 2 diabetes.
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Haeusler RA, Camastra S, Astiarraga B, Nannipieri M, Anselmino M, and Ferrannini E
- Abstract
Background/objectives: Increased endogenous glucose production is a hallmark of type 2 diabetes. Evidence from animal models has suggested that a likely cause of this is increased mRNA expression of glucose 6-phosphatase and phosphoenolpyruvate carboxykinase (encoded by G6PC, PCK1 and PCK2). But another contributing factor may be decreased liver glucokinase (encoded by GCK)., Methods: We examined expression of these enzymes in liver biopsies from 12 nondiabetic and 28 diabetic individuals. Diabetic patients were further separated into those with HbA1c lower or higher than 7.0., Results: In diabetic subjects with HbA1c > 7.0, we found that gluconeogenic enzymes were expressed normally, but GCK was suppressed more than 60%. Moreover, HbA1c and fasting glucose were negatively correlated with GCK, but showed no correlation with G6PC, PCK1, or PCK2., Conclusion: These findings suggest an underlying dysregulation of hepatic GCK expression during frank diabetes, which has implications for the therapeutic use of glucokinase activators in this population.
- Published
- 2014
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38. Human insulin resistance is associated with increased plasma levels of 12α-hydroxylated bile acids.
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Haeusler RA, Astiarraga B, Camastra S, Accili D, and Ferrannini E
- Subjects
- Adult, Female, Humans, Male, Middle Aged, Triglycerides blood, Bile Acids and Salts blood, Diabetes Mellitus, Type 2 blood, Insulin Resistance physiology
- Abstract
Bile acids (BAs) exert pleiotropic metabolic effects, and physicochemical properties of different BAs affect their function. In rodents, insulin regulates BA composition, in part by regulating the BA 12α-hydroxylase CYP8B1. However, it is unclear whether a similar effect occurs in humans. To address this question, we examined the relationship between clamp-measured insulin sensitivity and plasma BA composition in a cohort of 200 healthy subjects and 35 type 2 diabetic (T2D) patients. In healthy subjects, insulin resistance (IR) was associated with increased 12α-hydroxylated BAs (cholic acid, deoxycholic acid, and their conjugated forms). Furthermore, ratios of 12α-hydroxylated/non-12α-hydroxylated BAs were associated with key features of IR, including higher insulin, proinsulin, glucose, glucagon, and triglyceride (TG) levels and lower HDL cholesterol. In T2D patients, BAs were nearly twofold elevated, and more hydrophobic, compared with healthy subjects, although we did not observe disproportionate increases in 12α-hydroxylated BAs. In multivariate analysis of the whole dataset, controlling for sex, age, BMI, and glucose tolerance status, higher 12α-hydroxy/non-12α-hydroxy BA ratios were associated with lower insulin sensitivity and higher plasma TGs. These findings suggest a role for 12α-hydroxylated BAs in metabolic abnormalities in the natural history of T2D and raise the possibility of developing insulin-sensitizing therapeutics based on manipulations of BA composition.
- Published
- 2013
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39. Long-term effects of bariatric surgery on meal disposal and β-cell function in diabetic and nondiabetic patients.
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Camastra S, Muscelli E, Gastaldelli A, Holst JJ, Astiarraga B, Baldi S, Nannipieri M, Ciociaro D, Anselmino M, Mari A, and Ferrannini E
- Subjects
- Blood Glucose, Diabetes Mellitus, Type 2 surgery, Gastric Bypass, Glucagon blood, Humans, Insulin blood, Insulin Resistance, Obesity surgery, Obesity, Morbid surgery, Weight Loss, Diabetes Mellitus, Type 2 physiopathology, Insulin-Secreting Cells physiology
- Abstract
Gastric bypass surgery leads to marked improvements in glucose tolerance and insulin sensitivity in obese type 2 diabetes (T2D); the impact on glucose fluxes in response to a physiological stimulus, such as a mixed meal test (MTT), has not been determined. We administered an MTT to 12 obese T2D patients and 15 obese nondiabetic (ND) subjects before and 1 year after surgery (10 T2D and 11 ND) using the double-tracer technique and modeling of β-cell function. In both groups postsurgery, tracer-derived appearance of oral glucose was biphasic, a rapid increase followed by a sharp drop, a pattern that was mirrored by postprandial glucose levels and insulin secretion. In diabetic patients, surgery lowered fasting and postprandial glucose levels, peripheral insulin sensitivity increased in proportion to weight loss (~30%), and β-cell glucose sensitivity doubled but did not normalize (compared with 21 nonsurgical obese and lean controls). Endogenous glucose production, however, was less suppressed during the MMT as the combined result of a relative hyperglucagonemia and the rapid fall in plasma glucose and insulin levels. We conclude that in T2D, bypass surgery changes the postprandial response to a dumping-like pattern and improves glucose tolerance, β-cell function, and peripheral insulin sensitivity but worsens endogenous glucose output in response to a physiological stimulus.
- Published
- 2013
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40. Early metabolic markers of the development of dysglycemia and type 2 diabetes and their physiological significance.
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Ferrannini E, Natali A, Camastra S, Nannipieri M, Mari A, Adam KP, Milburn MV, Kastenmüller G, Adamski J, Tuomi T, Lyssenko V, Groop L, and Gall WE
- Subjects
- Adult, Animals, Biomarkers blood, Cell Line, Cohort Studies, Diabetes Mellitus, Type 2 blood, Diabetes Mellitus, Type 2 metabolism, Diabetes Mellitus, Type 2 physiopathology, Early Diagnosis, Female, Follow-Up Studies, Glucose Metabolism Disorders blood, Glucose Metabolism Disorders metabolism, Glucose Metabolism Disorders physiopathology, Humans, Hydroxybutyrates metabolism, Insulin metabolism, Insulin Secretion, Insulin-Secreting Cells metabolism, Male, Middle Aged, Phosphatidylcholines metabolism, Prospective Studies, ROC Curve, Rats, Diabetes Mellitus, Type 2 diagnosis, Glucose Metabolism Disorders diagnosis, Hydroxybutyrates blood, Insulin Resistance, Phosphatidylcholines blood
- Abstract
Metabolomic screening of fasting plasma from nondiabetic subjects identified α-hydroxybutyrate (α-HB) and linoleoyl-glycerophosphocholine (L-GPC) as joint markers of insulin resistance (IR) and glucose intolerance. To test the predictivity of α-HB and L-GPC for incident dysglycemia, α-HB and L-GPC measurements were obtained in two observational cohorts, comprising 1,261 nondiabetic participants from the Relationship between Insulin Sensitivity and Cardiovascular Disease (RISC) study and 2,580 from the Botnia Prospective Study, with 3-year and 9.5-year follow-up data, respectively. In both cohorts, α-HB was a positive correlate and L-GPC a negative correlate of insulin sensitivity, with α-HB reciprocally related to indices of β-cell function derived from the oral glucose tolerance test (OGTT). In follow-up, α-HB was a positive predictor (adjusted odds ratios 1.25 [95% CI 1.00-1.60] and 1.26 [1.07-1.48], respectively, for each standard deviation of predictor), and L-GPC was a negative predictor (0.64 [0.48-0.85] and 0.67 [0.54-0.84]) of dysglycemia (RISC) or type 2 diabetes (Botnia), independent of familial diabetes, sex, age, BMI, and fasting glucose. Corresponding areas under the receiver operating characteristic curve were 0.791 (RISC) and 0.783 (Botnia), similar in accuracy when substituting α-HB and L-GPC with 2-h OGTT glucose concentrations. When their activity was examined, α-HB inhibited and L-GPC stimulated glucose-induced insulin release in INS-1e cells. α-HB and L-GPC are independent predictors of worsening glucose tolerance, physiologically consistent with a joint signature of IR and β-cell dysfunction.
- Published
- 2013
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41. alpha-hydroxybutyrate is an early biomarker of insulin resistance and glucose intolerance in a nondiabetic population.
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Gall WE, Beebe K, Lawton KA, Adam KP, Mitchell MW, Nakhle PJ, Ryals JA, Milburn MV, Nannipieri M, Camastra S, Natali A, and Ferrannini E
- Subjects
- Adult, Biomarkers metabolism, Blood Glucose metabolism, Demography, Diabetes Mellitus blood, Female, Humans, Male, Metabolome, Middle Aged, Models, Biological, Receptor, Insulin metabolism, Diabetes Mellitus metabolism, Glucose Intolerance metabolism, Hydroxybutyrates metabolism, Insulin Resistance
- Abstract
Background: Insulin resistance is a risk factor for type 2 diabetes and cardiovascular disease progression. Current diagnostic tests, such as glycemic indicators, have limitations in the early detection of insulin resistant individuals. We searched for novel biomarkers identifying these at-risk subjects., Methods: Using mass spectrometry, non-targeted biochemical profiling was conducted in a cohort of 399 nondiabetic subjects representing a broad spectrum of insulin sensitivity and glucose tolerance (based on the hyperinsulinemic euglycemic clamp and oral glucose tolerance testing, respectively)., Results: Random forest statistical analysis selected alpha-hydroxybutyrate (alpha-HB) as the top-ranked biochemical for separating insulin resistant (lower third of the clamp-derived M(FFM) = 33 [12] micromol x min(-1) x kg(FFM) (-1), median [interquartile range], n = 140) from insulin sensitive subjects (M(FFM) = 66 [23] micromol x min(-1) x kg(FFM) (-1)) with a 76% accuracy. By targeted isotope dilution assay, plasma alpha-HB concentrations were reciprocally related to M(FFM); and by partition analysis, an alpha-HB value of 5 microg/ml was found to best separate insulin resistant from insulin sensitive subjects. alpha-HB also separated subjects with normal glucose tolerance from those with impaired fasting glycemia or impaired glucose tolerance independently of, and in an additive fashion to, insulin resistance. These associations were also independent of sex, age and BMI. Other metabolites from this global analysis that significantly correlated to insulin sensitivity included certain organic acid, amino acid, lysophospholipid, acylcarnitine and fatty acid species. Several metabolites are intermediates related to alpha-HB metabolism and biosynthesis., Conclusions: alpha-hydroxybutyrate is an early marker for both insulin resistance and impaired glucose regulation. The underlying biochemical mechanisms may involve increased lipid oxidation and oxidative stress.
- Published
- 2010
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42. Separate impact of obesity and glucose tolerance on the incretin effect in normal subjects and type 2 diabetic patients.
- Author
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Muscelli E, Mari A, Casolaro A, Camastra S, Seghieri G, Gastaldelli A, Holst JJ, and Ferrannini E
- Subjects
- Adult, Body Mass Index, Diabetes Mellitus, Type 2 complications, Diabetes Mellitus, Type 2 drug therapy, Female, Humans, Hypoglycemic Agents therapeutic use, Insulin blood, Insulin metabolism, Insulin Secretion, Insulin-Secreting Cells physiology, Male, Middle Aged, Obesity complications, Reference Values, Blood Glucose metabolism, Diabetes Mellitus, Type 2 blood, Glucose Tolerance Test, Obesity physiopathology
- Abstract
Objective: To quantitate the separate impact of obesity and hyperglycemia on the incretin effect (i.e., the gain in beta-cell function after oral glucose versus intravenous glucose)., Research Design and Methods: Isoglycemic oral (75 g) and intravenous glucose administration was performed in 51 subjects (24 with normal glucose tolerance [NGT], 17 with impaired glucose tolerance [IGT], and 10 with type 2 diabetes) with a wide range of BMI (20-61 kg/m(2)). C-peptide deconvolution was used to reconstruct insulin secretion rates, and beta-cell glucose sensitivity (slope of the insulin secretion/glucose concentration dose-response curve) was determined by mathematical modeling. The incretin effect was defined as the oral-to-intravenous ratio of responses. In 8 subjects with NGT and 10 with diabetes, oral glucose appearance was measured by the double-tracer technique., Results: The incretin effect on total insulin secretion and beta-cell glucose sensitivity and the GLP-1 response to oral glucose were significantly reduced in diabetes compared with NGT or IGT (P
- Published
- 2008
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43. Impact of incretin hormones on beta-cell function in subjects with normal or impaired glucose tolerance.
- Author
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Muscelli E, Mari A, Natali A, Astiarraga BD, Camastra S, Frascerra S, Holst JJ, and Ferrannini E
- Subjects
- Adult, Blood Glucose metabolism, Dose-Response Relationship, Drug, Fatty Acids, Nonesterified blood, Female, Gastric Inhibitory Polypeptide metabolism, Glucagon-Like Peptide 1 metabolism, Glucose Tolerance Test, Humans, Insulin blood, Insulin metabolism, Insulin-Secreting Cells metabolism, Male, Middle Aged, Models, Statistical, Radioimmunoassay, Glucose Intolerance metabolism, Hormones pharmacology, Insulin-Secreting Cells drug effects
- Abstract
The mechanisms by which the enteroinsular axis influences beta-cell function have not been investigated in detail. We performed oral and isoglycemic intravenous (IV) glucose administration in subjects with normal (NGT; n = 11) or impaired glucose tolerance (IGT; n = 10), using C-peptide deconvolution to calculate insulin secretion rates and mathematical modeling to quantitate beta-cell function. The incretin effect was taken to be the ratio of oral to IV responses. In NGT, incretin-mediated insulin release [oral glucose tolerance test (OGTT)/IV ratio = 1.59 +/- 0.18, P = 0.004] amounted to 18 +/- 2 nmol/m(2) (32 +/- 4% of oral response), and its time course matched that of total insulin secretion. The beta-cell glucose sensitivity (OGTT/IV ratio = 1.52 +/- 0.26, P = 0.02), rate sensitivity (response to glucose rate of change, OGTT/IV ratio = 2.22 +/- 0.37, P = 0.06), and glucose-independent potentiation were markedly higher with oral than IV glucose. In IGT, beta-cell glucose sensitivity (75 +/- 14 vs. 156 +/- 28 pmol.min(-1).m(-2).mM(-1) of NGT, P = 0.01) and potentiation were impaired on the OGTT. The incretin effect was not significantly different from NGT in terms of plasma glucagon-like peptide 1 and glucose-dependent insulinotropic polypeptide responses, total insulin secretion, and enhancement of beta-cell glucose sensitivity (OGTT/IV ratio = 1.73 +/- 0.24, P = NS vs. NGT). However, the time courses of incretin-mediated insulin secretion and potentiation were altered, with a predominance of glucose-induced vs. incretin-mediated stimulation. We conclude that, under physiological circumstances, incretin-mediated stimulation of insulin secretion results from an enhancement of all dynamic aspects of beta-cell function, particularly beta-cell glucose sensitivity. In IGT, beta-cell function is inherently impaired, whereas the incretin effect is only partially affected.
- Published
- 2006
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44. beta-cell function in obesity: effects of weight loss.
- Author
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Ferrannini E, Camastra S, Gastaldelli A, Maria Sironi A, Natali A, Muscelli E, Mingrone G, and Mari A
- Subjects
- Animals, Body Mass Index, Disease Models, Animal, Humans, Insulin metabolism, Insulin Secretion, Islets of Langerhans anatomy & histology, Organ Size, Islets of Langerhans metabolism, Obesity physiopathology, Weight Loss
- Abstract
In nondiabetic subjects, obesity is associated with a modest expansion of beta-cell mass, possibly amounting-according to the best available estimates-to 10-30% for each 10 kg of weight excess. Whether age of onset and duration of obesity, recent changes in body weight, and body fat distribution have any effect on beta-cell mass in humans is unknown. Both fasting insulin secretion and the total insulin response to oral glucose have the following characteristics: 1) they increase with BMI in an approximately linear fashion, 2) both fat-free and fat mass are significant positive correlates, and 3) BMI exerts a positive effect separate from that of insulin resistance (i.e., obesity may be a state of primary insulin hypersecretion). The mechanisms are currently unknown, though chronic small increments in plasma glucose may play a role. In contrast, dynamic properties of beta-cell function, such as glucose sensitivity (i.e., dose-response function), rate sensitivity, and potentiation, do not appear to be substantially altered by the presence of obesity, body fat distribution, or insulin resistance as long as glucose tolerance is maintained. Weight loss, by diet or restrictive bariatric surgery, is associated with consensual decrements in insulin resistance and insulin hypersecretion. The latter, however, seems to be more persistent, suggesting that the postobese state may reproduce the primary insulin hypersecretion of the obese state. Malabsorptive bariatric surgery, in contrast, normalizes insulin sensitivity and abolishes insulin hypersecretion even before achievement of ideal body weight. Lipid-triggered messages from the gastrointestinal tract to the insulin target tissues and endocrine pancreas are the subject of intense investigation.
- Published
- 2004
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45. Effect of acute hyperglycemia on insulin secretion in humans.
- Author
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Toschi E, Camastra S, Sironi AM, Masoni A, Gastaldelli A, Mari A, Ferrannini E, and Natali A
- Subjects
- Acute Disease, Adult, Aged, Arginine administration & dosage, C-Peptide blood, Glucose administration & dosage, Humans, Insulin blood, Insulin Secretion, Middle Aged, Diabetes Mellitus, Type 2 metabolism, Hyperglycemia metabolism, Insulin metabolism, Islets of Langerhans metabolism
- Abstract
First-phase insulin response to intravenous glucose is impaired both in type 2 diabetic patients and in subjects at risk for the disease. Hyperglycemia can modify beta-cell response by either inhibiting or potentiating both first- and second-phase insulin release. In normal subjects, the effect of acute hyperglycemia on insulin secretion is controversial. We measured (in 13 healthy volunteers) insulin secretion (by deconvolution of plasma C-peptide concentrations) during three consecutive 30-min hyperglycemic steps (2.8, 2.8, and 5.6 mmol/l), followed by an intravenous arginine bolus. First-phase insulin secretion in response to the first hyperglycemic step (456 +/- 83 pmol.min(-1).m(-2)) was significantly larger than that in response to the second step (311 +/- 37 pmol.min(-1).m(-2), P < 0.01); the subsequent increase in glycemia failed to stimulate first-phase secretion any further (377 +/- 60 pmol.min(-1).m(-2), NS vs. the previous value). This inhibition was also evident when insulin release rates were corrected for the respective increments (absolute or percentage) in plasma glucose levels and was not due to beta-cell exhaustion because the arginine bolus still elicited a large peak of insulin secretion (4,790 +/- 2,330 pmol.min(-1).m(-2)). In contrast, second-phase insulin secretion was related to the prevailing glucose levels across the three hyperglycemic steps in a direct quasilinear manner. We conclude that first-phase insulin secretion is inhibited by short-term modest hyperglycemia, whereas the second-phase insulin secretion increases linearly with hyperglycemia.
- Published
- 2002
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46. Insulin resistance in morbid obesity: reversal with intramyocellular fat depletion.
- Author
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Greco AV, Mingrone G, Giancaterini A, Manco M, Morroni M, Cinti S, Granzotto M, Vettor R, Camastra S, and Ferrannini E
- Subjects
- Adult, Body Mass Index, Diet, Reducing, Female, Humans, Leptin blood, Lipid Metabolism, Male, Muscle, Skeletal metabolism, Muscle, Skeletal pathology, Obesity, Morbid physiopathology, Postprandial Period, Reference Values, Weight Loss, Gastrectomy, Insulin Resistance physiology, Obesity, Morbid blood, Obesity, Morbid surgery
- Abstract
Obesity is a frequent cause of insulin resistance and poses a major risk for diabetes. Abnormal fat deposition within skeletal muscle has been identified as a mechanism of obesity-associated insulin resistance. We tested the hypothesis that dietary lipid deprivation may selectively deplete intramyocellular lipids, thereby reversing insulin resistance. Whole-body insulin sensitivity (by the insulin clamp technique), intramyocellular lipids (by quantitative histochemistry on quadriceps muscle biopsies), muscle insulin action (as the expression of Glut4 glucose transporters), and postprandial lipemia were measured in 20 morbidly obese patients (BMI = 49 +/- 8 [mean +/- SD] kg x m(-2)) and 7 nonobese control subjects. Patients were restudied 6 months later after biliopancreatic diversion (BPD; n = 8), an operation that induces predominant lipid malabsorption, or hypocaloric diet (n = 9). At 6 months, BPD had caused the loss of 33 +/- 10 kg through lipid malabsorption (documented by a flat postprandial triglyceride profile). Despite an attained BMI still in the obese range (39 +/- 8 kg x m(-2)), insulin resistance (23 +/- 3 micromol/min per kg of fat-free mass; P < 0.001 vs. 53 +/- 13 of control subjects) was fully reversed (52 +/- 11 micromol/min per kg of fat-free mass; NS versus control subjects). In parallel with this change, intramyocellular-but not perivascular or interfibrillar-lipid accumulation decreased (1.63 +/- 1.06 to 0.22 +/- 0.44 score units; P < 0.01; NS vs. 0.07 +/- 0.19 of control subjects), Glut4 expression was restored, and circulating leptin concentrations were normalized. In the diet group, a weight loss of 14 +/- 12 kg was accompanied by very modest changes in insulin sensitivity and intramyocellular lipid contents. We conclude that lipid deprivation selectively depletes intramyocellular lipid stores and induces a normal metabolic state (in terms of insulin-mediated whole-body glucose disposal, intracellular insulin signaling, and circulating leptin levels) despite a persistent excess of total body fat mass.
- Published
- 2002
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47. Hyperinsulinemia and autonomic nervous system dysfunction in obesity: effects of weight loss.
- Author
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Emdin M, Gastaldelli A, Muscelli E, Macerata A, Natali A, Camastra S, and Ferrannini E
- Subjects
- Adult, Blood Glucose metabolism, Body Mass Index, Catecholamines urine, Circadian Rhythm, Electrocardiography, Epinephrine blood, Epinephrine urine, Female, Heart Rate physiology, Humans, Insulin blood, Male, Valsalva Maneuver, Vascular Resistance physiology, Weight Loss physiology, Autonomic Nervous System physiopathology, Hyperinsulinism physiopathology, Obesity physiopathology
- Abstract
Background: Because hyperinsulinemia acutely stimulates adrenergic activity, it has been postulated that chronic hyperinsulinemia may lead to enhanced sympathetic tone and cardiovascular risk., Methods and Results: In 21 obese (body mass index, 35+/-1 kg/m(2)) and 17 lean subjects, we measured resting cardiac output (by 2-dimensional echocardiography), plasma concentrations and timed (diurnal versus nocturnal) urinary excretion of catecholamines, and 24-hour heart rate variability (by spectral analysis of ECG). In the obese versus lean subjects, cardiac output was increased by 22% (P:<0.03), and the nocturnal drop in urinary norepinephrine output was blunted (P:=0.01). Spectral power in the low-frequency range was depressed throughout 24 hours (P:<0.04). During the afternoon and early night, ie, the postprandial phase, high-frequency power was lower, heart rate was higher; and the ratio of low to high frequency, an index of sympathovagal balance, was increased in direct proportion to the degree of hyperinsulinemia independent of body mass index (partial r=0.43, P:=0.01). In 9 obese subjects who lost 10% to 18% of their body weight, cardiac output decreased and low-frequency power returned toward normal (P:<0.05)., Conclusions: In free-living subjects with uncomplicated obesity, chronic hyperinsulinemia is associated with a high-output, low-resistance hemodynamic state, persistent baroreflex downregulation, and episodic (postprandial) sympathetic dominance. Reversal of these changes by weight loss suggests a causal role for insulin.
- Published
- 2001
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48. Insulin prolongs the QTc interval in humans.
- Author
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Gastaldelli A, Emdin M, Conforti F, Camastra S, and Ferrannini E
- Subjects
- Adult, Blood Glucose drug effects, Blood Glucose metabolism, Female, Glucose Clamp Technique, Heart Rate drug effects, Humans, Infusions, Intravenous, Insulin administration & dosage, Male, Middle Aged, Potassium blood, Electrocardiography drug effects, Heart Rate physiology, Insulin blood, Insulin pharmacology
- Abstract
Insulin hyperpolarizes plasma membranes; we tested whether insulin affects ventricular repolarization. In 35 healthy volunteers, we measured the Q-T interval during electrocardiographic monitoring in the resting state and in response to hyperinsulinemia (euglycemic 1-mU. min(-1). kg(-1) insulin clamp). A computerized algorithm was used to identify T waves; Bazett's formula was employed to correct Q-T (QTc) by heart rate (HR). In the resting state, QTc was inversely related to indexes of body size (e.g., body surface area, r = -0.53, P = 0.001) but not to indexes of body fatness. During the clamp, HR (67 +/- 1 to 71 +/- 1 beats/min, P < 0.0001) and plasma norepinephrine levels (161 +/- 12 to 184 +/- 10 pg/ml, P < 0.001) increased. QTc rose promptly and consistently, averaging 428 +/- 6 ms between 30 and 100 min (P = 0.014 vs. the resting value of 420 +/- 5 ms). Fasting serum potassium (3.76 +/- 0.03 mM) declined to 3. 44 +/- 0.03 mM during insulin. After adjustment for body size, resting QTc was directly related to fasting plasma insulin (partial r = 0.43, P = 0.01); furthermore, QTc was inversely related to serum potassium levels both in the fasting state (partial r = -0.16, P < 0. 04) and during insulin stimulation (partial r = -0.47, P = 0.003). Neither resting nor clamp-induced QTc was related to insulin sensitivity. Physiological hyperinsulinemia acutely prolongs ventricular repolarization independent of insulin sensitivity. Both insulin-induced hypokalemia and adrenergic activation contribute to this effect.
- Published
- 2000
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49. Effect of vitamin C on forearm blood flow and glucose metabolism in essential hypertension.
- Author
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Natali A, Sironi AM, Toschi E, Camastra S, Sanna G, Perissinotto A, Taddei S, and Ferrannini E
- Subjects
- Blood Flow Velocity drug effects, Humans, Hypertension blood, Infusions, Intra-Arterial, Insulin blood, Insulin physiology, Insulin Resistance physiology, Male, Middle Aged, Regional Blood Flow drug effects, Vasodilation drug effects, Ascorbic Acid administration & dosage, Blood Glucose metabolism, Forearm blood supply, Forearm physiopathology, Hypertension metabolism, Hypertension physiopathology
- Abstract
In 9 patients with essential hypertension, we tested whether a high-dose (12 mg. min(-1)) vitamin C infusion into the brachial artery, by improving endothelium-dependent vasodilatation, would also attenuate the insulin resistance of deep forearm tissues. We measured the effect of vitamin C on acetylcholine (Ach)-induced vasodilatation and on forearm glucose uptake during systemic hyperinsulinemia; in all studies, the contralateral forearm served as the control. Intrabrachial Ach infusion produced a stable increase in forearm blood flow, from 2.6+/-0.3 to 10.6+/-2.1 mL. min(-1). dL(-1); when vitamin C was added, a further rise in forearm blood flow (to 13.4 mL. min(-1). dL(-1); P<0.03 vs Ach alone) was observed. In response to insulin, blood flow in both the infused and control forearms did not significantly change from baseline values (+10+/-16% and +2+/-11%, respectively). In contrast, when vitamin C was added, blood flow in the infused forearm increased significantly (to 3.7+/-0.7 mL. min(-1). dL(-1); P<0.02 vs 2.8+/-0.6 mL. min(-1). dL(-1) in the control forearm). Insulin stimulated whole-body glucose disposal to 20+/-2 micromol. min(-1). kg(-1), compatible with the presence of marked insulin resistance. Forearm glucose uptake was similarly stimulated after 80 minutes of insulin infusion (to 2.11+/-0.42 and 2.06+/-0.43 micromol. min(-1). dL(-1), infused and control, respectively). When intrabrachial vitamin C was added, no difference in glucose uptake was observed between the 2 forearms (infused, 2.37+/-0.44 micromol. min(-1). dL(-1)and control, 2.36+/-0. 53 micromol. min(-1). dL(-1)). Forearm O(2) uptake at baseline was also similar in the 2 forearms (infused, 9.7+/-0.7 micromol. min(-1). dL(-1) and control, 9.6+/-1.1 micromol. min(-1). dL(-1)) and was not changed by either insulin or vitamin C. We conclude that in the deep forearm tissues of patients with essential hypertension and insulin resistance, an acute improvement in endothelial function, obtained with pharmacological doses of vitamin C, restores insulin-mediated vasodilatation but does not improve insulin-mediated glucose uptake. Thus, the endothelial dysfunction of essential hypertension is unlikely to be responsible for their metabolic insulin resistance.
- Published
- 2000
- Full Text
- View/download PDF
50. Dose-response characteristics of insulin action on glucose metabolism: a non-steady-state approach.
- Author
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Natali A, Gastaldelli A, Camastra S, Sironi AM, Toschi E, Masoni A, Ferrannini E, and Mari A
- Subjects
- Adipose Tissue, Adult, Body Composition, Body Constitution, Deuterium, Dose-Response Relationship, Drug, Humans, Infusions, Intravenous, Insulin blood, Insulin pharmacology, Kinetics, Male, Metabolic Clearance Rate, Middle Aged, Blood Glucose metabolism, Insulin administration & dosage, Obesity blood
- Abstract
The traditional methods for the assessment of insulin sensitivity yield only a single index, not the whole dose-response curve information. This curve is typically characterized by a maximally insulin-stimulated glucose clearance (Cl(max)) and an insulin concentration at half-maximal response (EC(50)). We developed an approach for estimating the whole dose-response curve with a single in vivo test, based on the use of tracer glucose and exogenous insulin administration (two steps of 20 and 200 mU x min(-1) x m(-2), 100 min each). The effect of insulin on plasma glucose clearance was calculated from non-steady-state data by use of a circulatory model of glucose kinetics and a model of insulin action in which glucose clearance is represented as a Michaelis-Menten function of insulin concentration with a delay (t(1/2)). In seven nondiabetic subjects, the model predicted adequately the tracer concentration: the model residuals were unbiased, and their coefficient of variation was similar to the expected measurement error (approximately 3%), indicating that the model did not introduce significant systematic errors. Lean (n = 4) and obese (n = 3) subjects had similar half-times for insulin action (t(1/2) = 25 +/- 9 vs. 25 +/- 8 min) and maximal responses (Cl(max) = 705 +/- 46 vs. 668 +/- 259 ml x min(-1) x m(-2), respectively), whereas EC(50) was 240 +/- 84 microU/ml in the lean vs. 364 +/- 229 microU/ml in the obese (P < 0.04). EC(50) and the insulin sensitivity index (ISI, initial slope of the dose-response curve), but not Cl(max), were related to body adiposity and fat distribution with r of 0.6-0.8 (P < 0.05). Thus, despite the small number of study subjects, we were able to reproduce information consistent with the literature. In addition, among the lean individuals, t(1/2) was positively related to the ISI (r = 0.72, P < 0.02). We conclude that the test here presented, based on a more elaborate representation of glucose kinetics and insulin action, allows a reliable quantitation of the insulin dose-response curve for whole body glucose utilization in a single session of relatively short duration.
- Published
- 2000
- Full Text
- View/download PDF
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