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2. XEbf3 functions as an effector of XNeuroD during neurogenesis

Author

Pozzoli, O., Bosetti, A, Croci, L., Consalez, G.G., and Vetter, M.L.

Subjects
Developmental neurology -- Genetic aspects, Xenopus -- Genetic aspects, Biological sciences
Abstract

The EBF proteins, a family of helix-loop-helix transcription factors, play an important role during neuronal development in multiple species. Recently we identified in Xenopus a new member of this family, which we called XEbf3. To better understand the role of XEbf3 in the molecular cascade which controls neurogenesis in Xenopus, we have analyzed its expression pattern and function. During primary neurogenesis XEbf3 is activated in differentiating neurons after XNeuroD, and is also expressed in other parts of the nervous system in a pattern that overlaps with XNeuroD. Overexpression of XEbf3 induces ectopic expression of the neural markers N-tubulin and XNF(M) and can neuralize animal caps. To test whether XNeuroD regulates XEbf3 expression and to show that XEbf3 acts downstream of XNeuroD, we overexpressed XNeuroD and observed ectopic expression of XEbf3, both in vivo and in animal cap explains. Furthermore in animal caps, the hormone-inducible form of XNeuroD, XNeuroD-hGR, activates XEbf3 in the absence of protein synthesis, suggesting that XNeuroD activates XEbf3 directly. We also tested the sensitivity of XEbf3 to lateral inhibition, the Delta-Notch mediated mechanism which negatively regulates neurogenesis. We found that XEbf3, like XNeuroD, is not sensitive to lateral inhibition. In summary, we show that XEbf3 is a new regulator of primary neurogenesis in Xenopus which functions as a putative effector of XNeuroD.

Published
2000

6. Role of HIF-1 in proton-mediated CXCR4 down-regulation in endothelial cells

Author

Melchionna, R, Romani, M, Ambrosino, V, D'Arcangelo, D, Cencioni, C, Porcelli, D, Toietta, G, Truffa, S, Gaetano, C, Mangoni, A, Pozzoli, O, Cappuzzello, C, Capogrossi, M, Napolitano, M, CAPPUZZELLO, CLAUDIA, Napolitano, M., Melchionna, R, Romani, M, Ambrosino, V, D'Arcangelo, D, Cencioni, C, Porcelli, D, Toietta, G, Truffa, S, Gaetano, C, Mangoni, A, Pozzoli, O, Cappuzzello, C, Capogrossi, M, Napolitano, M, CAPPUZZELLO, CLAUDIA, and Napolitano, M.

Abstract

AimsAcidification is associated with a variety of pathological and physiological conditions. In the present study, we aimed at investigating whether acidic pH may regulate endothelial cell (EC) functions via the chemokine receptor CXCR4, a key modulator of EC biological activities.Methods and resultsExposure of ECs to acidic pH reversibly inhibited mRNA and protein CXCR4 expression, CXCL12/stromal cell-derived factor (SDF)-1-driven EC chemotaxis in vitro, and CXCR4 expression and activation in vivo in a mouse model. Further, CXCR4 signalling impaired acidosis-induced rescue from apoptosis in ECs. The inhibition of CXCR4 expression occurred transcriptionally and was hypoxia-inducible factor (HIF)-1-dependent as demonstrated by both HIF-1 and HIF-1 dominant negative overexpression, by HIF-1 silencing, and by targeted mutation of the-29 to-25 hypoxia response element (HRE) in the-357/-59 CXCR4 promoter fragment. Moreover, chromatin immunoprecipitation (ChIP) analysis showed endogenous HIF-1 binding to the CXCR4 promoter that was enhanced by acidification.ConclusionThe results of the present study identify CXCR4 as a key player in the EC response to acidic pH and show, for the first time, that HRE may function not only as an effector of hypoxia, but also as an acidosis response element, and raise the possibility that this may constitute a more general mechanism of transcriptional regulation at acidic pH. © The Author 2009. For permissions please.

Published
2010

8. Poster session 3

Author

Nanka, O., primary, Krejci, E., additional, Pesevski, Z., additional, Sedmera, D., additional, Smart, N., additional, Rossdeutsch, A., additional, Dube, K. N., additional, Riegler, J., additional, Price, A. N., additional, Taylor, A., additional, Muthurangu, V., additional, Turner, M., additional, Lythgoe, M. F., additional, Riley, P. R., additional, Kryvorot, S., additional, Vladimirskaya, T., additional, Shved, I., additional, Schwarzl, M., additional, Seiler, S., additional, Huber, S., additional, Steendijk, P., additional, Maechler, H., additional, Truschnig-Wilders, M., additional, Pieske, B., additional, Post, H., additional, Caprio, C., additional, Baldini, A., additional, Chiavacci, E., additional, Dolfi, L., additional, Verduci, L., additional, Meghini, F., additional, Cremisi, F., additional, Pitto, L., additional, Kuan, T.-C., additional, Chen, M.-C., additional, Yang, T.-H., additional, Wu, W.-T., additional, Lin, C. S., additional, Rai, H., additional, Kumar, S., additional, Sharma, A. K., additional, Mastana, S., additional, Kapoor, A., additional, Pandey, C. M., additional, Agrawal, S., additional, Sinha, N., additional, Orlowska-Baranowska, E. H., additional, Placha, G., additional, Gora, J., additional, Baranowski, R., additional, Abramczuk, E., additional, Hryniewiecki, T., additional, Gaciong, Z., additional, Verschuren, J. J. W., additional, Wessels, J. A. M., additional, Trompet, S., additional, Stott, D. J., additional, Sattar, N., additional, Buckley, B., additional, Guchelaar, H. J., additional, Jukema, J. W., additional, Gharanei, M., additional, Hussain, A., additional, Mee, C. J., additional, Maddock, H. L., additional, Wijnen, W. J., additional, Van Den Oever, S., additional, Van Der Made, I., additional, Hiller, M., additional, Tijsen, A. J., additional, Pinto, Y. M., additional, Creemers, E. E., additional, Nikulina, S. U. Y., additional, Chernova, A., additional, Petry, A., additional, Rzymski, T., additional, Kracun, D., additional, Riess, F., additional, Pike, L., additional, Harris, A. L., additional, Gorlach, A., additional, Katare, R., additional, Oikawa, A., additional, Riu, F., additional, Beltrami, A. P., additional, Cesseli, D., additional, Emanueli, C., additional, Madeddu, P., additional, Zaglia, T., additional, Milan, G., additional, Franzoso, M., additional, Pesce, P., additional, Sarais, C., additional, Sandri, M., additional, Mongillo, M., additional, Butler, T. J., additional, Seymour, A.-M. L., additional, Ashford, D., additional, Jaffre, F., additional, Bussen, M., additional, Flohrschutz, I., additional, Martin, G. R., additional, Engelhardt, S., additional, Kararigas, G., additional, Nguyen, B. T., additional, Jarry, H., additional, Regitz-Zagrosek, V., additional, Van Bilsen, M., additional, Daniels, A., additional, Munts, C., additional, Janssen, B. J. A., additional, Van Der Vusse, G. J., additional, Van Nieuwenhoven, F. A., additional, Montalvo, C., additional, Villar, A. V., additional, Merino, D., additional, Garcia, R., additional, Llano, M., additional, Ares, M., additional, Hurle, M. A., additional, Nistal, J. F., additional, Dembinska-Kiec, A., additional, Beata Kiec-Wilk, B. K. W., additional, Anna Polus, A. P., additional, Urszula Czech, U. C., additional, Tatiana Konovaleva, T. K., additional, Gerd Schmitz, G. S., additional, Bertrand, L., additional, Balteau, M., additional, Timmermans, A., additional, Viollet, B., additional, Sakamoto, K., additional, Feron, O., additional, Horman, S., additional, Vanoverschelde, J. L., additional, Beauloye, C., additional, De Meester, C., additional, Martinez, E., additional, Martin, R., additional, Miana, M., additional, Jurado, R., additional, Gomez-Hurtado, N., additional, Bartolome, M. V., additional, San Roman, J. A., additional, Lahera, V., additional, Nieto, M. L., additional, Cachofeiro, V., additional, Rochais, F., additional, Sturny, R., additional, Mesbah, K., additional, Miquerol, L., additional, Kelly, R. G., additional, Messaoudi, S., additional, Gravez, B., additional, Tarjus, A., additional, Pelloux, V., additional, Samuel, J. L., additional, Delcayre, C., additional, Launay, J. M., additional, Clement, K., additional, Farman, N., additional, Jaisser, F., additional, Hadyanto, L., additional, Castellani, C., additional, Vescovo, G., additional, Ravara, B., additional, Tavano, R., additional, Pozzobon, M., additional, De Coppi, P., additional, Papini, E., additional, Vettor, R., additional, Thiene, G., additional, Angelini, A., additional, Meloni, M., additional, Caporali, A., additional, Cesselli, D., additional, Fortunato, O., additional, Avolio, E., additional, Schindler, R., additional, Simrick, S., additional, Brand, T., additional, Smart, N. S., additional, Herman, A., additional, Roura Ferrer, S., additional, Rodriguez Bago, J., additional, Soler-Botija, C., additional, Pujal, J. M., additional, Galvez-Monton, C., additional, Prat-Vidal, C., additional, Llucia-Valldeperas, A., additional, Blanco, J., additional, Bayes-Genis, A., additional, Foldes, G., additional, Maxime, M., additional, Ali, N. N., additional, Schneider, M. D., additional, Harding, S. E., additional, Reni, C., additional, Mangialardi, G., additional, De Pauw, A., additional, Sekkali, B., additional, Friart, A., additional, Ding, H., additional, Graffeuil, A., additional, Catalucci, D., additional, Balligand, J. L., additional, Azibani, F., additional, Tournoux, F., additional, Schlossarek, S., additional, Polidano, E., additional, Fazal, L., additional, Merval, R., additional, Carrier, L., additional, Chatziantoniou, C., additional, Buyandelger, B., additional, Linke, W., additional, Zou, P., additional, Kostin, S., additional, Ku, C., additional, Felkin, L., additional, Birks, E., additional, Barton, P., additional, Sattler, M., additional, Knoell, R., additional, Schroder, K., additional, Benkhoff, S., additional, Shimokawa, H., additional, Grisk, O., additional, Brandes, R. P., additional, Parepa, I. R., additional, Mazilu, L., additional, Suceveanu, A. I., additional, Suceveanu, A., additional, Rusali, L., additional, Cojocaru, L., additional, Matei, L., additional, Toringhibel, M., additional, Craiu, E., additional, Pires, A. L., additional, Pinho, M., additional, Pinho, S., additional, Sena, C., additional, Seica, R., additional, Leite-Moreira, A., additional, Dabroi, F., additional, Schiaffino, S., additional, Kiseleva, E., additional, Krukov, N., additional, Nikitin, O., additional, Ardatova, L., additional, Mourouzis, I., additional, Pantos, C., additional, Kokkinos, A. D., additional, Cokkinos, D. V., additional, Scoditti, E., additional, Massaro, M., additional, Carluccio, M. A., additional, Pellegrino, M., additional, Calabriso, N., additional, Gastaldelli, A., additional, Storelli, C., additional, De Caterina, R., additional, Lindner, D., additional, Zietsch, C., additional, Schultheiss, H.-P., additional, Tschope, C., additional, Westermann, D., additional, Everaert, B. R., additional, Nijenhuis, V. J., additional, Reith, F. C. M., additional, Hoymans, V. Y., additional, Timmermans, J. P., additional, Vrints, C. J., additional, Simova, I., additional, Mateev, H., additional, Katova, T., additional, Haralanov, L., additional, Dimitrov, N., additional, Mironov, N., additional, Golitsyn, S. P., additional, Sokolov, S. F., additional, Yuricheva, Y. U. A., additional, Maikov, E. B., additional, Shlevkov, N. B., additional, Rosenstraukh, L. V., additional, Chazov, E. I., additional, Radosinska, J., additional, Knezl, V., additional, Benova, T., additional, Slezak, J., additional, Urban, L., additional, Tribulova, N., additional, Virag, L., additional, Kristof, A., additional, Kohajda, Z. S., additional, Szel, T., additional, Husti, Z., additional, Baczko, I., additional, Jost, N., additional, Varro, A., additional, Sarusi, A., additional, Farkas, A. S., additional, Orosz, S. Z., additional, Forster, T., additional, Farkas, A., additional, Zakhrabova-Zwiauer, O. M., additional, Hardziyenka, M., additional, Nieuwland, R., additional, Tan, H. L., additional, Raaijmakers, A. J. A., additional, Bourgonje, V. J. A., additional, Kok, G. J. M., additional, Van Veen, A. A. B., additional, Anderson, M. E., additional, Vos, M. A., additional, Bierhuizen, M. F. A., additional, Benes, J., additional, Sebestova, B., additional, Ghouri, I. A., additional, Kemi, O. J., additional, Kelly, A., additional, Burton, F. L., additional, Smith, G. L., additional, Ozdemir, S., additional, Acsai, K., additional, Doisne, N., additional, Van Der Nagel, R., additional, Beekman, H. D. M., additional, Van Veen, T. A. B., additional, Sipido, K. R., additional, Antoons, G., additional, Harmer, S. C., additional, Mohal, J. S., additional, Kemp, D., additional, Tinker, A., additional, Beech, D., additional, Burley, D. S., additional, Cox, C. D., additional, Wann, K. T., additional, Baxter, G. F., additional, Wilders, R., additional, Verkerk, A., additional, Fragkiadaki, P., additional, Germanakis, G., additional, Tsarouchas, K., additional, Tsitsimpikou, C., additional, Tsardi, M., additional, George, D., additional, Tsatsakis, A., additional, Rodrigues, P., additional, Barros, C., additional, Najmi, A. K., additional, Khan, V., additional, Akhtar, M., additional, Pillai, K. K., additional, Mujeeb, M., additional, Aqil, M., additional, Bayliss, C. R., additional, Messer, A. E., additional, Leung, M.-C., additional, Ward, D., additional, Van Der Velden, J., additional, Poggesi, C., additional, Redwood, C. S., additional, Marston, S., additional, Vite, A., additional, Gandjbakhch, E., additional, Gary, F., additional, Fressart, V., additional, Leprince, P., additional, Fontaine, G., additional, Komajda, M., additional, Charron, P., additional, Villard, E., additional, Falcao-Pires, I., additional, Gavina, C., additional, Hamdani, N., additional, Stienen, G. J. M., additional, Niessens, H. W. M., additional, Leite-Moreira, A. F., additional, Paulus, W. J., additional, Memo, M., additional, Marston, S. B., additional, Vafiadaki, E., additional, Qian, J., additional, Arvanitis, D. A., additional, Sanoudou, D., additional, Kranias, E. G., additional, Elmstedt, N., additional, Lind, B., additional, Ferm-Widlund, K., additional, Westgren, M., additional, Brodin, L.-A., additional, Mansfield, C., additional, West, T., additional, Ferenczi, M., additional, Wijnker, P. J. M., additional, Foster, D. B., additional, Coulter, A., additional, Frazier, A., additional, Murphy, A. M., additional, Shah, M., additional, Sikkel, M. B., additional, Desplantez, T., additional, Collins, T. P., additional, O' Gara, P., additional, Lyon, A. R., additional, Macleod, K. T., additional, Ottesen, A. H., additional, Louch, W. E., additional, Carlson, C., additional, Landsverk, O. J. B., additional, Stridsberg, M., additional, Sjaastad, I., additional, Oie, E., additional, Omland, T., additional, Christensen, G., additional, Rosjo, H., additional, Cartledge, J., additional, Clark, L. A., additional, Ibrahim, M., additional, Siedlecka, U., additional, Navaratnarajah, M., additional, Yacoub, M. H., additional, Camelliti, P., additional, Terracciano, C. M., additional, Chester, A., additional, Gonzalez-Tendero, A., additional, Torre, I., additional, Garcia-Garcia, F., additional, Dopazo, J., additional, Gratacos, E., additional, Taylor, D., additional, Bhandari, S., additional, Seymour, A.-M., additional, Fliegner, D., additional, Jost, J., additional, Bugger, H., additional, Ventura-Clapier, R., additional, Carpi, A., additional, Campesan, M., additional, Canton, M., additional, Menabo, R., additional, Pelicci, P. G., additional, Giorgio, M., additional, Di Lisa, F., additional, Hancock, M., additional, Venturini, A., additional, Al-Shanti, N., additional, Stewart, C., additional, Ascione, R., additional, Angelini, G., additional, Suleiman, M.-S., additional, Kravchuk, E., additional, Grineva, E., additional, Galagudza, M., additional, Kostareva, A., additional, Bairamov, A., additional, Krychtiuk, K. A., additional, Watzke, L., additional, Kaun, C., additional, Demyanets, S., additional, Pisoni, J., additional, Kastl, S. P., additional, Huber, K., additional, Maurer, G., additional, Wojta, J., additional, Speidl, W. S., additional, Varga, Z. V., additional, Farago, N., additional, Zvara, A., additional, Kocsis, G. F., additional, Pipicz, M., additional, Csonka, C., additional, Csont, T., additional, Puskas, G. L., additional, Ferdinandy, P., additional, Klevstigova, M., additional, Silhavy, J., additional, Manakov, D., additional, Papousek, F., additional, Novotny, J., additional, Pravenec, M., additional, Kolar, F., additional, Novakova, O., additional, Novak, F., additional, Neckar, J., additional, Barallobre-Barreiro, J., additional, Didangelos, A., additional, Yin, X., additional, Fernandez-Caggiano, M., additional, Drozdov, I., additional, Willeit, P., additional, Domenech, N., additional, Mayr, M., additional, Lemoine, S., additional, Allouche, S., additional, Coulbault, L., additional, Galera, P., additional, Gerard, J. L., additional, Hanouz, J. L., additional, Suveren, E., additional, Whiteman, M., additional, Studneva, I. M., additional, Pisarenko, O., additional, Shulzhenko, V., additional, Serebryakova, L., additional, Tskitishvili, O., additional, Timoshin, A., additional, Fauconnier, J., additional, Meli, A. C., additional, Thireau, J., additional, Roberge, S., additional, Lompre, A. M., additional, Jacotot, E., additional, Marks, A. M., additional, Lacampagne, A., additional, Dietel, B., additional, Altendorf, R., additional, Daniel, W. G., additional, Kollmar, R., additional, Garlichs, C. D., additional, Parente, V., additional, Balasso, S., additional, Pompilio, G., additional, Colombo, G., additional, Milano, G., additional, Squadroni, L., additional, Cotelli, F., additional, Pozzoli, O., additional, Capogrossi, M. C., additional, Ajiro, Y., additional, Saegusa, N., additional, Iwade, K., additional, Giles, W. R., additional, Stafforini, D. M., additional, Spitzer, K. W., additional, Sirohi, R., additional, Candilio, L., additional, Babu, G., additional, Roberts, N., additional, Lawrence, D., additional, Sheikh, A., additional, Kolvekar, S., additional, Yap, J., additional, Hausenloy, D. J., additional, Yellon, D. M., additional, Aslam, M., additional, Rohrbach, S., additional, Schlueter, K.-D., additional, Piper, H. M., additional, Noll, T., additional, Guenduez, D., additional, Malinova, L., additional, Ryabukho, V. P., additional, Lyakin, D. V., additional, Denisova, T. P., additional, Montoro-Garcia, S., additional, Shantsila, E., additional, Lip, G. Y. H., additional, Kalaska, B., additional, Sokolowska, E., additional, Kaminski, K., additional, Szczubialka, K., additional, Kramkowski, K., additional, Mogielnicki, A., additional, Nowakowska, M., additional, Buczko, W., additional, Stancheva, N., additional, Mekenyan, E., additional, Gospodinov, K., additional, Tisheva, S., additional, Darago, A., additional, Rutkai, I., additional, Kalasz, J., additional, Czikora, A., additional, Orosz, P., additional, Bjornson, H. D., additional, Edes, I., additional, Papp, Z., additional, Toth, A., additional, Riches, K., additional, Warburton, P., additional, O'regan, D. J., additional, Ball, S. G., additional, Turner, N. A., additional, Wood, I. C., additional, Porter, K. E., additional, Kogaki, S., additional, Ishida, H., additional, Nawa, N., additional, Takahashi, K., additional, Baden, H., additional, Ichimori, H., additional, Uchikawa, T., additional, Mihara, S., additional, Miura, K., additional, Ozono, K., additional, Lugano, R., additional, Padro, T., additional, Garcia-Arguinzonis, M., additional, Badimon, L., additional, Ferraro, F., additional, Viner, R., additional, Ho, J., additional, Cutler, D., additional, Matchkov, V., additional, Aalkjaer, C., additional, Krijnen, P. A. J., additional, Hahn, N. E., additional, Kholova, I., additional, Sipkens, J. A., additional, Van Alphen, F. P., additional, Simsek, S., additional, Schalkwijk, C. G., additional, Van Buul, J. D., additional, Van Hinsbergh, V. W. M., additional, Niessen, H. W. M., additional, Caro, C. G., additional, Seneviratne, A., additional, Monaco, C., additional, Hou, D., additional, Singh, J., additional, Gilson, P., additional, Burke, M. G., additional, Heraty, K. B., additional, Krams, R., additional, Coppola, G., additional, Albrecht, K., additional, Schgoer, W., additional, Wiedemann, D., additional, Bonaros, N., additional, Steger, C., additional, Theurl, M., additional, Stanzl, U., additional, Kirchmair, R., additional, Amadesi, S., additional, Spinetti, G., additional, Cangiano, E., additional, Valgimigli, M., additional, Miller, A. M., additional, Cardinali, A., additional, Vierlinger, K., additional, Pagano, G., additional, Liccardo, D., additional, Zincarelli, C., additional, Femminella, G. D., additional, Lymperopoulos, A., additional, De Lucia, C., additional, Koch, W. J., additional, Leosco, D., additional, Rengo, G., additional, Hinkel, R., additional, Husada, W., additional, Trenkwalder, T., additional, Di, Q., additional, Lee, S., additional, Petersen, B., additional, Bock-Marquette, I., additional, Niemann, H., additional, Di Maio, M., additional, Kupatt, C., additional, Nourian, M., additional, Yassin, Z., additional, Kelishadi, R., additional, Memarian, S. H., additional, Heidari, A., additional, Leuner, A., additional, Poitz, D. M., additional, Brunssen, C., additional, Ravens, U., additional, Strasser, R. H., additional, Morawietz, H., additional, Vogt, F., additional, Grahl, A., additional, Flege, C., additional, Marx, N., additional, Borinski, M., additional, De Geest, B., additional, Jacobs, F., additional, Muthuramu, I., additional, Gordts, S. C., additional, Van Craeyveld, E., additional, Herijgers, P., additional, Weinert, S., additional, Medunjanin, S., additional, Herold, J., additional, Schmeisser, A., additional, Braun-Dullaeus, R. C., additional, Wagner, A. H., additional, Moeller, K., additional, Adolph, O., additional, Schwarz, M., additional, Schwale, C., additional, Bruehl, C., additional, Nobiling, R., additional, Wieland, T., additional, Schneider, S. W., additional, Hecker, M., additional, Cross, A., additional, Strom, A., additional, Cole, J., additional, Goddard, M., additional, Hultgardh-Nilsson, A., additional, Nilsson, J., additional, Mauri, C., additional, Mitkovskaya, N. P., additional, Kurak, T. A., additional, Oganova, E. G., additional, Shkrebneva, E. I., additional, Kot, Z. H. N., additional, Statkevich, T. V., additional, Molica, F., additional, Burger, F., additional, Matter, C. M., additional, Thomas, A., additional, Staub, C., additional, Zimmer, A., additional, Cravatt, B., additional, Pacher, P., additional, Steffens, S., additional, Blanco, R., additional, Sarmiento, R., additional, Parisi, C., additional, Fandino, S., additional, Blanco, F., additional, Gigena, G., additional, Szarfer, J., additional, Rodriguez, A., additional, Garcia Escudero, A., additional, Riccitelli, M. A., additional, Wantha, S., additional, Simsekyilmaz, S., additional, Megens, R. T., additional, Van Zandvoort, M. A., additional, Liehn, E., additional, Zernecke, A., additional, Klee, D., additional, Weber, C., additional, Soehnlein, O., additional, Lima, L. M., additional, Carvalho, M. G., additional, Gomes, K. B., additional, Santos, I. R., additional, Sousa, M. O., additional, Morais, C. A. S., additional, Oliveira, S. H. V., additional, Gomes, I. F., additional, Brandao, F. C., additional, Lamego, M. R. A., additional, Fornai, L., additional, Kiss, A., additional, Giskes, F., additional, Eijkel, G., additional, Fedrigo, M., additional, Valente, M. L., additional, Heeren, R. M. A., additional, Grdinic, A., additional, Vojvodic, D., additional, Djukanovic, N., additional, Grdinic, A. G., additional, Obradovic, S., additional, Majstorovic, I., additional, Rusovic, S., additional, Vucinic, Z., additional, Tavciovski, D., additional, Ostojic, M., additional, Lai, S.-C., additional, Chen, M.-Y., additional, Wu, H.-T., additional, Gouweleeuw, L., additional, Oberdorf-Maass, S. U., additional, De Boer, R. A., additional, Van Gilst, W. H., additional, Maass, A. H., additional, Van Gelder, I. C., additional, Benard, L., additional, Li, C., additional, Warren, D., additional, Shanahan, C. M., additional, Zhang, Q. P., additional, Bye, A., additional, Vettukattil, R., additional, Aspenes, S. T., additional, Giskeodegaard, G., additional, Gribbestad, I. S., additional, Wisloff, U., additional, Bathen, T. F., additional, Cubedo, J., additional, Alonso, R., additional, Mata, P., additional, Ivic, I., additional, Vamos, Z., additional, Cseplo, P., additional, Kosa, D., additional, Torok, O., additional, Hamar, J., additional, Koller, A., additional, Norita, K., additional, De Noronha, S. V., additional, Sheppard, M. N., additional, Amat-Roldan, I., additional, Iruretagoiena, I., additional, Psilodimitrakopoulos, S., additional, Crispi, F., additional, Artigas, D., additional, Loza-Alvarez, P., additional, Harrison, J. C., additional, Smart, S. D., additional, Besely, E. H., additional, Kelly, J. R., additional, Yao, Y., additional, Sammut, I. A., additional, Hoepfner, M., additional, Kuzyniak, W., additional, Sekhosana, E., additional, Hoffmann, B., additional, Litwinski, C., additional, Pries, A., additional, Ermilov, E., additional, Fontoura, D., additional, Lourenco, A. P., additional, Vasques-Novoa, F., additional, Pinto, J. P., additional, Roncon-Albuquerque, R., additional, Oyeyipo, I. P., additional, Olatunji, L. A., additional, Usman, T. O., additional, Olatunji, V. A., additional, Bacova, B., additional, Viczenczova, C., additional, Dosenko, V., additional, Goncalvesova, E., additional, Vanrooyen, J., additional, Maulik, S. K., additional, Seth, S., additional, Dinda, A. K., additional, Jaiswal, A., additional, Mearini, G., additional, Khajetoorians, D., additional, Kraemer, E., additional, Gedicke-Hornung, C., additional, Precigout, G., additional, Eschenhagen, T., additional, Voit, T., additional, Garcia, L., additional, Lorain, S., additional, Mendes-Ferreira, P., additional, Maia-Rocha, C., additional, Adao, R., additional, Cerqueira, R. J., additional, Mendes, M. J., additional, Castro-Chaves, P., additional, De Keulenaer, G. W., additional, Bras-Silva, C., additional, Ruiter, G., additional, Wong, Y. Y., additional, Lubberink, M., additional, Knaapen, P., additional, Raijmakers, P., additional, Lammertsma, A. A., additional, Marcus, J. T., additional, Westerhof, N., additional, Van Der Laarse, W. J., additional, Vonk-Noordegraaf, A., additional, Steinbronn, N., additional, Koch, E., additional, Steiner, G., additional, Berezin, A., additional, Lisovaya, O. A., additional, Soldatova, A. M., additional, Kuznetcov, V. A., additional, Yenina, T. N., additional, Rychkov, A. Y. U., additional, Shebeko, P. V., additional, Altara, R., additional, Hessel, M. H. M., additional, Hermans, J. J. R., additional, Blankesteijn, W. M., additional, Berezina, T. A., additional, Seden, V., additional, Bonanad, C., additional, Nunez, J., additional, Navarro, D., additional, Chilet, M. F., additional, Sanchis, F., additional, Bodi, V., additional, Minana, G., additional, Chaustre, F., additional, Forteza, M. J., additional, Llacer, A., additional, Galasso, G., additional, Ferrara, N., additional, Akhmedov, A., additional, Klingenberg, R., additional, Brokopp, C., additional, Hof, D., additional, Zoller, S., additional, Corti, R., additional, Gay, S., additional, Von Eckardstein, A., additional, Hoerstrup, S. P., additional, Luescher, T. F., additional, Heijman, J., additional, Zaza, A., additional, Johnson, D. M., additional, Rudy, Y., additional, Peeters, R. L. M., additional, Volders, P. G. A., additional, Westra, R. L., additional, Fujita, S., additional, Okamoto, R., additional, Taniguchi, M., additional, Konishi, K., additional, Goto, I., additional, Sugimoto, K., additional, Nakamura, M., additional, Shiraki, K., additional, Buechler, C., additional, and Ito, M., additional

Published
2012
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11. Mmot1, a new helix-loop-helix transcription factor gene displaying a sharp expression boundary in the embryonic mouse brain.

Author

Malgaretti, N, Pozzoli, O, Bosetti, A, Corradi, A, Ciarmatori, S, Panigada, M, Bianchi, M E, Martinez, S, and Consalez, G G

Abstract

Several genetic factors have been proven to contribute to the specification of the metencephalic-mesencephalic territory, a process that sets the developmental foundation for prospective morphogenesis of the cerebellum and mesencephalon. However, evidence stemming from genetic and developmental studies performed in man and various model organisms suggests the contribution of many additional factors in determining the fine subdivision and differentiation of these central nervous system regions. In man, the cerebellar ataxias/aplasias represent a large and heterogeneous family of genetic disorders. Here, we describe the identification by differential screening and the characterization of Mmot1, a new gene encoding a DNA-binding protein strikingly similar to the helix-loop-helix factor Ebf/Olf1. Throughout midgestation embryogenesis, Mmot1 is expressed at high levels in the metencephalon, mesencephalon, and sensory neurons of the nasal cavity. In vitro DNA binding data suggest some functional equivalence of Mmot1 and Ebf/Olf1, possibly accounting for the reported lack of olfactory or neural defects in Ebf-/- knockout mutants. The isolation of Mmot1 and of an additional homolog in the mouse genome defines a novel, phylogenetically conserved mammalian family of transcription factor genes of potential relevance in studies of neural development and its aberrations.

Published
1997

12. Xebf3 Is a Regulator of Neuronal Differentiation during Primary Neurogenesis in Xenopus

Author

Alessandro Bosetti, Monica L. Vetter, G. Giacomo Consalez, Laura Croci, Ombretta Pozzoli, Pozzoli, O, Bosetti, A, Croci, L, Consalez, GIAN GIACOMO, and Vetter, M.

Subjects
primary neurogenesis, Ebf, Molecular Sequence Data, HLH transcription factor, Regulator, Xenopus, Nerve Tissue Proteins, Xenopus Proteins, Nervous System, 03 medical and health sciences, Xenopus laevis, 0302 clinical medicine, Olf-1 homolog, Protein biosynthesis, Basic Helix-Loop-Helix Transcription Factors, Animals, Amino Acid Sequence, Binding site, Cloning, Molecular, Transcription factor, Molecular Biology, In Situ Hybridization, 030304 developmental biology, DNA Primers, Neurons, 0303 health sciences, biology, Base Sequence, Sequence Homology, Amino Acid, Neurogenesis, Helix-Loop-Helix Motifs, Gene Expression Regulation, Developmental, Embryo, Cell Differentiation, Cell Biology, biology.organism_classification, Molecular biology, Cell biology, DNA-Binding Proteins, Neural plate, 030217 neurology & neurosurgery, Transcription Factors, Developmental Biology
Abstract

During primary neurogenesis in Xenopus, a cascade of helix–loop–helix (HLH) transcription factors regulates neuronal determination and differentiation. While XNeuroD functions at a late step in this cascade to regulate neuronal differentiation, the factors that carry out terminal differentiation are still unknown. We have isolated a new Xenopus member of the Ebf/Olf-1 family of HLH transcription factors, Xebf3, and provide evidence that, during primary neurogenesis, it regulates neuronal differentiation downstream of XNeuroD. In developing Xenopus embryos, Xebf3 is turned on in the three stripes of primary neurons at stage 15.5, after XNeuroD. In vitro, XEBF3 binds the EBF/OLF-1 binding site and functions as a transcriptional activator. When overexpressed, Xebf3 is able to induce ectopic neurons at neural plate stages and directly convert ectodermal cells into neurons in animal cap explants. Expression of Xebf3 can be activated by XNeuroD both in whole embryos and in animal caps, indicating that this new HLH factor might be regulated by XNeuroD. Furthermore, in animal caps, XNeuroD can activate Xebf3 in the absence of protein synthesis, suggesting that, in vitro, this regulation is direct. Similar to XNeuroD, but unlike Xebf2/Xcoe2, Xebf3 expression and function are insensitive to Delta/Notch-mediated lateral inhibition. In summary, we conclude that Xebf3 functions downstream of XNeuroD and is a regulator of neuronal differentiation in Xenopus.

Published
2001
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13. GKLF in thymus epithelium as a developmentally regulated element of thymocyte-stroma cross-talk

Author

Francesca Sutti, G. Giacomo Consalez, Ombretta Pozzoli, Simona Porcellini, Maria Guttinger, Maddalena Panigada, Luisa Doneda, Fabio Grassi, Panigada, M, Porcellini, S, Sutti, F, Doneda, L, Pozzoli, O, Consalez, GIAN GIACOMO, Guttinger, M, and Grassi, F.

Subjects
Embryology, Time Factors, Kruppel-Like Transcription Factors, Down-Regulation, Thymus Gland, Biology, Epithelium, Cell Line, Kruppel-Like Factor 4, Mice, Ribonucleases, medicine, Transcriptional regulation, Animals, Tissue Distribution, In Situ Hybridization, Regulation of gene expression, Mice, Inbred BALB C, Immunomagnetic Separation, Reverse Transcriptase Polymerase Chain Reaction, T-cell receptor, Antibodies, Monoclonal, Gene Expression Regulation, Developmental, 3T3 Cells, Sequence Analysis, DNA, Gene rearrangement, Immunohistochemistry, Up-Regulation, Cell biology, DNA-Binding Proteins, Kinetics, Haematopoiesis, Thymocyte, medicine.anatomical_structure, Cancer research, RNA, Stromal Cells, CD8, Signal Transduction, Transcription Factors, Developmental Biology
Abstract

Gut-enriched Kruppel-like factor (GKLF) is a transcriptional regulator expressed in differentiated epithelia. We identified GKLF transcript as a regulated element in thymic epithelium of recombinase-deficient mice during thymus development induced by anti-CD3 antibody injection. This treatment recapitulates the organogenetic process depending on productive rearrangement of T cell receptor (TCR) β gene with thymocytes expansion and acquisition of the CD4+8+ double positive phenotype. In wildtype mice, GKLF is expressed very early in embryogenesis and becomes intensely up-regulated in thymus epithelium at day 18 of gestation when TCR β expressing cells have selectively expanded and express both CD4 and CD8. The results presented here suggest that thymocytes may regulate GKLF transcriptionally in the cortical epithelium at the developmental check-point controlled by TCR β gene rearrangement. Furthermore, GKLF expression in hematopoietic stroma might suggest the thus far uncharacterised participation of this factor in hematopoiesis.

Published
1999

14. Role of HIF-1alpha in proton-mediated CXCR4 down-regulation in endothelial cells

Author

Maurizio C. Capogrossi, Gabriele Toietta, Daniele Porcelli, Carlo Gaetano, Chiara Cencioni, Valeria Ambrosino, Silvia Truffa, Roberta Melchionna, Ombretta Pozzoli, Marta Romani, Daniela D'Arcangelo, Claudia Cappuzzello, Antonella Mangoni, Monica Napolitano, Melchionna, R, Romani, M, Ambrosino, V, D'Arcangelo, D, Cencioni, C, Porcelli, D, Toietta, G, Truffa, S, Gaetano, C, Mangoni, A, Pozzoli, O, Cappuzzello, C, Capogrossi, M, and Napolitano, M

Subjects
Male, Chromatin Immunoprecipitation, Receptors, CXCR4, Time Factors, Transcription, Genetic, Physiology, Response element, Down-Regulation, Apoptosis, Biology, Transfection, Ammonium Chloride, Chemokine receptor, Mice, Physiology (medical), Transcriptional regulation, Gene silencing, Animals, Humans, RNA, Messenger, Phosphorylation, Promoter Regions, Genetic, Cells, Cultured, Binding Sites, Effector, Chemotaxis, HIF-1, Endothelial Cells, Hydrogen-Ion Concentration, Hypoxia-Inducible Factor 1, alpha Subunit, Cell Hypoxia, Chemokine CXCL12, Cell biology, Endothelial stem cell, Disease Models, Animal, Acidosi, Biochemistry, Chemokine, Mutation, RNA Interference, Cardiology and Cardiovascular Medicine, Acidosis, Chromatin immunoprecipitation
Abstract

AimsAcidification is associated with a variety of pathological and physiological conditions. In the present study, we aimed at investigating whether acidic pH may regulate endothelial cell (EC) functions via the chemokine receptor CXCR4, a key modulator of EC biological activities.Methods and resultsExposure of ECs to acidic pH reversibly inhibited mRNA and protein CXCR4 expression, CXCL12/stromal cell-derived factor (SDF)-1-driven EC chemotaxis in vitro, and CXCR4 expression and activation in vivo in a mouse model. Further, CXCR4 signalling impaired acidosis-induced rescue from apoptosis in ECs. The inhibition of CXCR4 expression occurred transcriptionally and was hypoxia-inducible factor (HIF)-1-dependent as demonstrated by both HIF-1 and HIF-1 dominant negative overexpression, by HIF-1 silencing, and by targeted mutation of the-29 to-25 hypoxia response element (HRE) in the-357/-59 CXCR4 promoter fragment. Moreover, chromatin immunoprecipitation (ChIP) analysis showed endogenous HIF-1 binding to the CXCR4 promoter that was enhanced by acidification.ConclusionThe results of the present study identify CXCR4 as a key player in the EC response to acidic pH and show, for the first time, that HRE may function not only as an effector of hypoxia, but also as an acidosis response element, and raise the possibility that this may constitute a more general mechanism of transcriptional regulation at acidic pH. © The Author 2009. For permissions please.

Published
2009

15. Expression of KIF3C kinesin during neural development and in vitro neuronal differentiation

Author

F, Navone, G G, Consalez, M, Sardella, E, Caspani, O, Pozzoli, C, Frassoni, E, Morlacchi, R, Sitia, T, Sprocati, A, Cabibbo, Navone, F, Consalez, GIAN GIACOMO, Sardella, M, Caspani, E, Pozzoli, O, Frassoni, C, Morlacchi, E, Sitia, Roberto, Sprocati, T, and Cabibbo, A.

Subjects
Brain Chemistry, Neurons, Immunoblotting, Brain, Gene Expression, Kinesins, Cell Differentiation, Gestational Age, Tretinoin, Blotting, Northern, Immunohistochemistry, Immunoenzyme Techniques, Kinetics, Mice, Neuroblastoma, Tumor Cells, Cultured, Animals, Humans, RNA, Messenger, Neuroglia, In Situ Hybridization
Abstract

KIF3A, KIF3B and KIF3C are kinesin-related motor subunits of the KIF3 family that associate to form the kinesin-II motor complex in which KIF3C and KIF3B are alternative partners of KIF3A. We have analysed the expression of Kif3 mRNAs during prenatal murine development. Kif3c transcripts are detectable from embryonic day 12.5 and persist throughout development both in the CNS and in some peripheral ganglia. Comparison of the expression patterns of the Kif3 genes revealed that Kif3c and Kif3a mRNAs colocalize in the CNS, while only Kif3a is also present outside the CNS. In contrast, Kif3b is detectable in several non-neural tissues. We have also performed immunocytochemical analyses of the developing rat brain and have found the presence of the KIF3C protein in selected brain regions and in several fibre systems. Using neuroblastoma cells as an in vitro model for neuronal differentiation, we found that retinoic acid stimulated the expression of the three Kif3 and the kinesin-associated protein genes, although with different time courses. The selective expression of Kif3c in the nervous system during embryonic development and its up-regulation during neuroblastoma differentiation suggest a role for this motor during maturation of neuronal cells.

Published
2001

16. Mab21, the mouse homolog of a C. elegans cell-fate specification gene, participates in cerebellar, midbrain and eye development

Author

Anna Corradi, Danila Baldessari, Ombretta Pozzoli, Riccardo Fesce, Nicoletta Malgaretti, G. Giacomo Consalez, Salvador Martinez, Edoardo Boncinelli, Margherita Mariani, Mariani, M, Corradi, A, Baldessari, D, Malgaretti, N, Pozzoli, O, Fesce, R, Martinez, S, Boncinelli, E, and Consalez, GIAN GIACOMO

Subjects
Embryology, Cerebellum, Central nervous system, Cell fate determination, Biology, Eye, Retina, Mice, Mesencephalon, medicine, Animals, Caenorhabditis elegans Proteins, Gene, Regulator gene, Homeodomain Proteins, Genetics, Gene Expression Regulation, Developmental, Helminth Proteins, Embryo, Mammalian, medicine.anatomical_structure, Animals, Newborn, Eye development, Homeobox, PAX6, Developmental Biology
Abstract

A multitude of regulatory genes are involved in phylogenetically conserved developmental cascades required for the patterning, cell-type specification, and differentiation of specific central nervous system (CNS) structures. Here, we describe the distribution of a mouse transcript encoding a homolog of the C. elegans mab-21 gene. In the nematode tail, mab-21 is required for the short-range patterning and cell-fate determination events mediated by egl-5 and mab-18, two homeobox genes homologous to Abd-B and Pax6, respectively. In mouse midgestation embryogenesis, Mab21 is expressed at its highest levels in the rhombencephalon, cerebellum, midbrain, and prospective neural retina. Our data and the genetic interactions previously documented in the nematode suggest that Mab21 may represent a novel, important regulator of mammalian cerebellum and eye development.

Published
1998

17. MITO-Luc/GFP zebrafish model to assess spatial and temporal evolution of cell proliferation in vivo.

Author

de Latouliere L, Manni I, Ferrari L, Pisati F, Totaro MG, Gurtner A, Marra E, Pacello L, Pozzoli O, Aurisicchio L, Capogrossi MC, Deflorian G, and Piaggio G

Subjects
Animals, Animals, Genetically Modified genetics, Animals, Genetically Modified metabolism, Green Fluorescent Proteins genetics, Luciferases genetics, Regeneration, Zebrafish genetics, Zebrafish metabolism, Animals, Genetically Modified growth & development, Cell Proliferation, Evolution, Molecular, Green Fluorescent Proteins metabolism, Luciferases metabolism, Spatio-Temporal Analysis, Zebrafish growth & development
Abstract

We developed a novel reporter transgenic zebrafish model called MITO-Luc/GFP zebrafish in which GFP and luciferase expression are under the control of the master regulator of proliferation NF-Y. In MITO-Luc/GFP zebrafish it is possible to visualize cell proliferation in vivo by fluorescence and bioluminescence. In this animal model, GFP and luciferase expression occur in early living embryos, becoming tissue specific in juvenile and adult zebrafish. By in vitro and ex vivo experiments we demonstrate that luciferase activity in adult animals occurs in intestine, kidney and gonads, where detectable proliferating cells are located. Further, by time lapse experiments in live embryos, we observed a wave of GFP positive cells following fin clip. In adult zebrafish, in addition to a bright bioluminescence signal on the regenerating tail, an early unexpected signal coming from the kidney occurs indicating not only a fin cell proliferation, but also a systemic response to tissue damage. Finally, we observed that luciferase activity was inhibited by anti-proliferative interventions, i.e. 5FU, cell cycle inhibitors and X-Rays. In conclusion, MITO-Luc/GFP zebrafish is a novel animal model that may be crucial to assess the spatial and temporal evolution of cell proliferation in vivo.

Published
2021
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18. Identification of Kita (c-Kit) positive cells in the heart of adult zebrafish.

Author

Verduci L, Loparco G, Pozzoli O, Pompilio G, and Capogrossi MC

Subjects
Age Factors, Animals, Heart growth & development, Myocardium chemistry, Myocardium metabolism, Myocytes, Cardiac chemistry, Proto-Oncogene Proteins c-kit analysis, Zebrafish, Heart embryology, Myocytes, Cardiac metabolism, Proto-Oncogene Proteins c-kit biosynthesis, RNA, Messenger biosynthesis
Published
2014
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19. Hypoxia/reoxygenation cardiac injury and regeneration in zebrafish adult heart.

Author

Parente V, Balasso S, Pompilio G, Verduci L, Colombo GI, Milano G, Guerrini U, Squadroni L, Cotelli F, Pozzoli O, and Capogrossi MC

Subjects
Animals, Apoptosis, Cell Proliferation, Heart Injuries metabolism, Heart Injuries pathology, Heart Ventricles metabolism, Heart Ventricles pathology, Heart Ventricles physiopathology, Hypoxia metabolism, Hypoxia pathology, Hypoxia-Inducible Factor 1, alpha Subunit metabolism, Myocardial Reperfusion Injury metabolism, Myocardial Reperfusion Injury pathology, Myocardial Reperfusion Injury physiopathology, Myocardium pathology, Oxidative Stress, Recovery of Function, Zebrafish, Heart physiopathology, Heart Injuries physiopathology, Hypoxia physiopathology, Myocardium metabolism, Oxygen metabolism, Regeneration
Abstract

Aims: the adult zebrafish heart regenerates spontaneously after injury and has been used to study the mechanisms of cardiac repair. However, no zebrafish model is available that mimics ischemic injury in mammalian heart. We developed and characterized zebrafish cardiac injury induced by hypoxia/reoxygenation (H/R) and the regeneration that followed it., Methods and Results: adult zebrafish were kept either in hypoxic (H) or normoxic control (C) water for 15 min; thereafter fishes were returned to C water. Within 2-6 hours (h) after reoxygenation there was evidence of cardiac oxidative stress by dihydroethidium fluorescence and protein nitrosylation, as well as of inflammation. We used Tg(cmlc2:nucDsRed) transgenic zebrafish to identify myocardial cell nuclei. Cardiomyocyte apoptosis and necrosis were evidenced by TUNEL and Acridine Orange (AO) staining, respectively; 18 h after H/R, 9.9±2.6% of myocardial cell nuclei were TUNEL(+) and 15.0±2.5% were AO(+). At the 30-day (d) time point myocardial cell death was back to baseline (n = 3 at each time point). We evaluated cardiomyocyte proliferation by Phospho Histone H3 (pHH3) or Proliferating Cell Nuclear Antigen (PCNA) expression. Cardiomyocyte proliferation was apparent 18-24 h after H/R, it achieved its peak 3-7d later, and was back to baseline at 30d. 7d after H/R 17.4±2.3% of all cardiomyocytes were pHH3(+) and 7.4±0.6% were PCNA(+) (n = 3 at each time point). Cardiac function was assessed by 2D-echocardiography and Ventricular Diastolic and Systolic Areas were used to compute Fractional Area Change (FAC). FAC decreased from 29.3±2.0% in normoxia to 16.4±1.8% at 18 h after H/R; one month later ventricular function was back to baseline (n = 12 at each time point)., Conclusions: zebrafish exposed to H/R exhibit evidence of cardiac oxidative stress and inflammation, myocardial cell death and proliferation. The initial decrease in ventricular function is followed by full recovery. This model more closely mimics reperfusion injury in mammals than other cardiac injury models.

Published
2013
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20. Endothelial fate and angiogenic properties of human CD34+ progenitor cells in zebrafish.

Author

Pozzoli O, Vella P, Iaffaldano G, Parente V, Devanna P, Lacovich M, Lamia CL, Fascio U, Longoni D, Cotelli F, Capogrossi MC, and Pesce M

Subjects
Amputation, Surgical, Animal Fins surgery, Animals, Animals, Genetically Modified, Caco-2 Cells, Cell Movement, Endothelial Cells immunology, Fetal Blood immunology, Gene Expression Regulation, Developmental, Humans, Paracrine Communication, Phenotype, RNA Interference, Recombinant Fusion Proteins metabolism, Regeneration, Signal Transduction, Vascular Endothelial Growth Factor C genetics, Vascular Endothelial Growth Factor C metabolism, Zebrafish Proteins genetics, Zebrafish Proteins metabolism, Animal Fins blood supply, Antigens, CD34 analysis, Cell Differentiation drug effects, Cord Blood Stem Cell Transplantation, Endothelial Cells transplantation, Fetal Blood cytology, Hematopoietic Stem Cell Transplantation, Hematopoietic Stem Cells immunology, Neovascularization, Physiologic, Zebrafish embryology, Zebrafish genetics, Zebrafish growth & development
Abstract

Objective: The vascular competence of human-derived hematopoietic progenitors for postnatal vascularization is still poorly characterized. It is unclear whether, in the absence of ischemia, hematopoietic progenitors participate in neovascularization and whether they play a role in new blood vessel formation by incorporating into developing vessels or by a paracrine action., Methods and Results: In the present study, human cord blood-derived CD34(+) (hCD34(+)) cells were transplanted into pre- and postgastrulation zebrafish embryos and in an adult vascular regeneration model induced by caudal fin amputation. When injected before gastrulation, hCD34(+) cells cosegregated with the presumptive zebrafish hemangioblasts, characterized by Scl and Gata2 expression, in the anterior and posterior lateral mesoderm and were involved in early development of the embryonic vasculature. These morphogenetic events occurred without apparent lineage reprogramming, as shown by CD45 expression. When transplanted postgastrulation, hCD34(+) cells were recruited into developing vessels, where they exhibited a potent paracrine proangiogenic action. Finally, hCD34(+) cells rescued vascular defects induced by Vegf-c in vivo targeting and enhanced vascular repair in the zebrafish fin amputation model., Conclusions: These results indicate an unexpected developmental ability of human-derived hematopoietic progenitors and support the hypothesis of an evolutionary conservation of molecular pathways involved in endothelial progenitor differentiation in vivo.

Published
2011
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21. Gene transfer into human cord blood-derived CD34(+) cells by adeno-associated viral vectors.

Author

Schuhmann NK, Pozzoli O, Sallach J, Huber A, Avitabile D, Perabo L, Rappl G, Capogrossi MC, Hallek M, Pesce M, and Büning H

Subjects
Antineoplastic Agents pharmacology, Clinical Trials as Topic, Fetal Blood cytology, Genome, Viral, Humans, Hydroxamic Acids pharmacology, Integrin alpha5beta1 genetics, Myocardial Ischemia metabolism, Myocardial Ischemia therapy, Protein Synthesis Inhibitors pharmacology, Stem Cell Transplantation methods, Stem Cells, Transcription, Genetic drug effects, Transcription, Genetic genetics, Tretinoin pharmacology, Antigens, CD34, Dependovirus, Fetal Blood metabolism, Genetic Vectors, Integrin alpha5beta1 biosynthesis, Transduction, Genetic methods
Abstract

Objective: Bone marrow-derived CD34(+) cells are currently used in clinical trials in patients with ischemic heart disease. An option to enhance activity of injected progenitors may be offered by genetic engineering of progenitor cells with angiogenic growth factors. Recombinant adeno-associated viral vectors (rAAV) have emerged as a leading gene transfer systems. In contrast to other vector systems in use for genetic engineering of CD34(+) cells, rAAV-mediated gene expression does not depend on vector integration. This is relevant for application in regenerative medicine of ischemic tissues, where transient transgene expression is likely sufficient to achieve therapeutic benefits., Materials and Methods: We compared three different human AAV serotypes, packaged as pseudotypes by a helper virus-free production method, for their transduction efficiency in human cord blood-derived CD34(+) cells. We further assessed the impact of vector genome conformation, of alpha(v)beta(5) and alpha(5)beta(1) integrin availability and of the transcription-modulating drugs retinoic acid and Trichostatin A on rAAV-mediated human CD34(+) cell transduction., Results: We provide, for the first time, evidence that hCD34(+) cells can be reproducibly transduced with high efficiency by self-complementary rAAV2 without inducing cytotoxicity or interfering with their differentiation potential. We further show the involvement of alpha(5)beta(1) integrin as a crucial AAV2 internalization receptor and a function for transcription-modulating drugs in enhancing rAAV-mediated transgene expression., Conclusion: This study represents a first step toward translation of a combined cellular/rAAV-based therapy of ischemic disease.

Published
2010
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22. Role of HIF-1alpha in proton-mediated CXCR4 down-regulation in endothelial cells.

Author

Melchionna R, Romani M, Ambrosino V, D'Arcangelo D, Cencioni C, Porcelli D, Toietta G, Truffa S, Gaetano C, Mangoni A, Pozzoli O, Cappuzzello C, Capogrossi MC, and Napolitano M

Subjects
Acidosis chemically induced, Acidosis immunology, Acidosis pathology, Ammonium Chloride, Animals, Apoptosis, Binding Sites, Cell Hypoxia, Cells, Cultured, Chemokine CXCL12 metabolism, Chemotaxis, Chromatin Immunoprecipitation, Disease Models, Animal, Down-Regulation, Endothelial Cells immunology, Endothelial Cells pathology, Humans, Hydrogen-Ion Concentration, Hypoxia-Inducible Factor 1, alpha Subunit genetics, Male, Mice, Mutation, Phosphorylation, Promoter Regions, Genetic, RNA Interference, RNA, Messenger metabolism, Receptors, CXCR4 genetics, Time Factors, Transcription, Genetic, Transfection, Acidosis metabolism, Endothelial Cells metabolism, Hypoxia-Inducible Factor 1, alpha Subunit metabolism, Receptors, CXCR4 metabolism
Abstract

Aims: Acidification is associated with a variety of pathological and physiological conditions. In the present study, we aimed at investigating whether acidic pH may regulate endothelial cell (EC) functions via the chemokine receptor CXCR4, a key modulator of EC biological activities., Methods and Results: Exposure of ECs to acidic pH reversibly inhibited mRNA and protein CXCR4 expression, CXCL12/stromal cell-derived factor (SDF)-1-driven EC chemotaxis in vitro, and CXCR4 expression and activation in vivo in a mouse model. Further, CXCR4 signalling impaired acidosis-induced rescue from apoptosis in ECs. The inhibition of CXCR4 expression occurred transcriptionally and was hypoxia-inducible factor (HIF)-1alpha-dependent as demonstrated by both HIF-1alpha and HIF-1alpha dominant negative overexpression, by HIF-1alpha silencing, and by targeted mutation of the -29 to -25 hypoxia response element (HRE) in the -357/-59 CXCR4 promoter fragment. Moreover, chromatin immunoprecipitation (ChIP) analysis showed endogenous HIF-1alpha binding to the CXCR4 promoter that was enhanced by acidification., Conclusion: The results of the present study identify CXCR4 as a key player in the EC response to acidic pH and show, for the first time, that HRE may function not only as an effector of hypoxia, but also as an acidosis response element, and raise the possibility that this may constitute a more general mechanism of transcriptional regulation at acidic pH.

Published
2010
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23. Myocardial infarction induces embryonic reprogramming of epicardial c-kit(+) cells: role of the pericardial fluid.

Author

Limana F, Bertolami C, Mangoni A, Di Carlo A, Avitabile D, Mocini D, Iannelli P, De Mori R, Marchetti C, Pozzoli O, Gentili C, Zacheo A, Germani A, and Capogrossi MC

Subjects
Aged, Animals, Cell Differentiation, Cell Proliferation, Female, Humans, Male, Mice, Mice, Inbred C57BL, Middle Aged, Myocardial Infarction pathology, Pericardial Effusion metabolism, Proto-Oncogene Proteins c-kit genetics, Signal Transduction, WT1 Proteins metabolism, Myocardial Infarction metabolism, Pericardium metabolism, Proto-Oncogene Proteins c-kit metabolism
Abstract

Stem cells expressing c-kit have been identified in the adult epicardium. In mice, after myocardial infarction, these cells proliferate, migrate to the injury site and differentiate toward myocardial and vascular phenotype. We hypothesized that, acutely after myocardial infarction, pericardial sac integrity and pericardial fluid (PF) may play a role on epicardial cell gene expression, proliferation and differentiation. Microarray analysis indicated that, in the presence of an intact pericardial sac, myocardial infarction modulated 246 genes in epicardial cells most of which were related to cell proliferation, cytoskeletal organization, wound repair and signal transduction. Interestingly, WT1, Tbx18 and RALDH2, notably involved in epicardial embryonic development, were markedly up-regulated. Importantly, coexpression of stem cell antigen c-kit and WT1 and/or Tbx18 was detected by immunohistochemistry in the mouse epicardium during embryogenesis as well as in adult mouse infarcted heart. Injection of human pericardial fluid from patients with acute myocardial ischemia (PFMI) in the pericardial cavity of non-infarcted mouse hearts, enhanced, epicardial cell proliferation and WT1 expression. Further, PFMI supplementation to hypoxic cultured human epicardial c-kit(+) cells increased WT1 and Tbx18 mRNA expression. Finally, insulin-like growth factor 1, hepatocyte growth factor and high mobility group box 1 protein, previously involved in cardiac c-kit(+) cell proliferation and differentiation, were increased in PFMI compared to the pericardial fluid of non ischemic patients. In conclusion, myocardial infarction reactivates an embryonic program in epicardial c-kit(+) cells; soluble factors released in the pericardial fluids following myocardial necrosis may play a role in this process., (Copyright (c) 2009 Elsevier Ltd. All rights reserved.)

Published
2010
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24. Regulated expression pattern of gremlin during zebrafish development.

Author

Nicoli S, Gilardelli CN, Pozzoli O, Presta M, and Cotelli F

Subjects
Amino Acid Sequence, Animals, Base Sequence, Blastula physiology, Body Patterning, Conserved Sequence, Female, Humans, Molecular Sequence Data, Morphogenesis, Sequence Alignment, Sequence Homology, Amino Acid, Transcription, Genetic, Carrier Proteins genetics, Gene Expression Regulation, Developmental, Zebrafish embryology, Zebrafish Proteins genetics
Abstract

Xenopus laevis Gremlin has been isolated as a novel dorsalizing factor, belonging to a family of secreted proteins with axial patterning activity . In a search for genes that control development in zebrafish (Danio rerio), we have identified a sequence homologous to Xenopus gremlin. This paper describes the cloning of zebrafish gremlin (grm) and its expression pattern during development. Our results show that grm encodes a maternal transcript, and the zygotic transcription is turned on at the mid-blastula transition (MBT), when grm is detected in the entire blastoderm. In the gastrula grm becomes restricted to the dorsolateral region of the embryo, and during somitogenesis it is strongly expressed in the presomitic mesoderm and developing somites, and in the ventral neural tube. From 24 hpf to 48 hpf, we show that grm transcription is downregulated in the whole embryo, even though Grm protein is still present and localized into the entire myotome at 48-72 hpf. Finally, grm transcript is strongly downregulated in fibroblast growth factor-8 (fgf8) and sonic hedgehog (shh) mutants, thus implicating a putative role of Fgf/Shh signalling loop in grm expression regulation.

Published
2005
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25. Identification and expression pattern of mago nashi during zebrafish development.

Author

Pozzoli O, Gilardelli CN, Sordino P, Doniselli S, Lamia CL, and Cotelli F

Subjects
Amino Acid Sequence, Animals, Base Sequence, Biological Transport drug effects, Biological Transport physiology, Blastoderm metabolism, Expressed Sequence Tags, Gastrula metabolism, Gene Expression Regulation, Developmental, In Situ Hybridization, Microtubules drug effects, Microtubules metabolism, Molecular Sequence Data, RNA, Messenger biosynthesis, RNA-Binding Proteins, Yolk Sac embryology, Yolk Sac metabolism, Zebrafish embryology, Zebrafish genetics, Zebrafish Proteins genetics, Drosophila Proteins genetics, Nuclear Proteins genetics, Zebrafish metabolism, Zebrafish Proteins metabolism
Abstract

In a search for zebrafish genes expressed during early stages of development, we have identified two ESTs encoding proteins related to Drosophila mago nashi. Zebrafish mago nashi codes for a small protein with no clearly identified functional domains, and which is highly conserved during evolution. This paper describes the identification and a detailed gene expression analysis of zebrafish mago nashi during development. Our results demonstrate that mago nashi encodes a maternal transcript detected in both blastomeres and yolk cell at the 1-2 cell stages, and in the blastoderm during segmentation. We show that a putative microtubule-mediated transport of mago nashi mRNA from the vegetal hemisphere into animal blastomeres determines the localization of the transcript in the animal pole, immediately after fertilization. Furthermore, the microtubule array contained into the yolk cell seems to be responsible for the high level of mago nashi transcript detected in the central blastomeres at the 8-16 cell stages. Zygotic mago nashi is expressed into the dorsal-marginal region during gastrulation, and starting from somitogenesis to 24 hpf, the expression domain becomes progressively restricted to the developing neural tube and paraxial structures, and ventrally to the pronephric ducts.

Published
2004
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26. Functional and hierarchical interactions among zebrafish vox/vent homeobox genes.

Author

Gilardelli CN, Pozzoli O, Sordino P, Matassi G, and Cotelli F

Subjects
Amino Acid Sequence, Animals, Base Sequence, Body Patterning genetics, Bone Morphogenetic Proteins metabolism, Embryo, Nonmammalian drug effects, Gene Expression Regulation, Developmental, Microinjections, Models, Biological, Molecular Sequence Data, Oligonucleotides, Antisense pharmacology, Phylogeny, Protein Structure, Tertiary, Sequence Homology, Amino Acid, Zebrafish embryology, Zebrafish genetics, Zebrafish Proteins chemistry, Genes, Homeobox, Transcription Factors genetics, Transcription Factors metabolism, Zebrafish Proteins genetics, Zebrafish Proteins metabolism
Abstract

The vertebrate Vox/Vent family of transcription factors plays a crucial role in the establishment of the dorsoventral (DV) axis, by repressing organizer genes such as bozozok/dharma, goosecoid, and chordino. In Danio rerio (zebrafish), members of the vox/vent gene family (vox/vega1, vent/vega2, and ved) are thought to share expression patterns and functional properties. Bringing novel insights in the differential activity of the zebrafish vox/vent genes, we propose a critical role for the ved gene in DV patterning of vertebrate embryos. ved is not only expressed as a maternal gene, but it also appears to function as a repressor of dorsal factors involved in organizer formation. At early- and mid-gastrula stage, ved appears to be finely controlled by antagonist crosstalks in a complex regulatory network, involving gradients of bone morphogenetic protein (BMP) activity, dorsal factors, and vox/vent family members. We show that ved transcripts are ventrally restricted by BMP factors such as bmp2b, bmp7, smad5, and alk8, and by dorsal factors (chd and gsc). Alteration of ved expression in both vox and vent deletion mutants and vox and vent mRNAs-injected embryos, suggests that vox and vent function downstream of BMP signaling to negatively regulate ved expression. This inhibitory role is emphasized by a vox and vent redundant activity, compared with single gene effects., (Copyright 2004 Wiley-Liss, Inc.)

Published
2004
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27. Xebf3 is a regulator of neuronal differentiation during primary neurogenesis in Xenopus.

Author

Pozzoli O, Bosetti A, Croci L, Consalez GG, and Vetter ML

Subjects
Amino Acid Sequence, Animals, Base Sequence, Basic Helix-Loop-Helix Transcription Factors, Cell Differentiation, Cloning, Molecular, DNA Primers genetics, DNA-Binding Proteins genetics, DNA-Binding Proteins physiology, Gene Expression Regulation, Developmental, Helix-Loop-Helix Motifs, In Situ Hybridization, Molecular Sequence Data, Nerve Tissue Proteins genetics, Nerve Tissue Proteins physiology, Nervous System cytology, Neurons cytology, Sequence Homology, Amino Acid, Transcription Factors chemistry, Transcription Factors genetics, Xenopus laevis genetics, Nervous System embryology, Transcription Factors physiology, Xenopus Proteins, Xenopus laevis embryology
Abstract

During primary neurogenesis in Xenopus, a cascade of helix--loop--helix (HLH) transcription factors regulates neuronal determination and differentiation. While XNeuroD functions at a late step in this cascade to regulate neuronal differentiation, the factors that carry out terminal differentiation are still unknown. We have isolated a new Xenopus member of the Ebf/Olf-1 family of HLH transcription factors, Xebf3, and provide evidence that, during primary neurogenesis, it regulates neuronal differentiation downstream of XNeuroD. In developing Xenopus embryos, Xebf3 is turned on in the three stripes of primary neurons at stage 15.5, after XNeuroD. In vitro, XEBF3 binds the EBF/OLF-1 binding site and functions as a transcriptional activator. When overexpressed, Xebf3 is able to induce ectopic neurons at neural plate stages and directly convert ectodermal cells into neurons in animal cap explants. Expression of Xebf3 can be activated by XNeuroD both in whole embryos and in animal caps, indicating that this new HLH factor might be regulated by XNeuroD. Furthermore, in animal caps, XNeuroD can activate Xebf3 in the absence of protein synthesis, suggesting that, in vitro, this regulation is direct. Similar to XNeuroD, but unlike Xebf2/Xcoe2, Xebf3 expression and function are insensitive to Delta/Notch-mediated lateral inhibition. In summary, we conclude that Xebf3 functions downstream of XNeuroD and is a regulator of neuronal differentiation in Xenopus., (Copyright 2001 Academic Press.)

Published
2001
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28. Expression of KIF3C kinesin during neural development and in vitro neuronal differentiation.

Author

Navone F, Consalez GG, Sardella M, Caspani E, Pozzoli O, Frassoni C, Morlacchi E, Sitia R, Sprocati T, and Cabibbo A

Subjects
Animals, Blotting, Northern, Brain Chemistry, Gestational Age, Humans, Immunoblotting, Immunoenzyme Techniques, Immunohistochemistry, In Situ Hybridization, Kinesins analysis, Kinetics, Mice, Neuroblastoma metabolism, Neuroblastoma pathology, Neuroglia chemistry, Neurons chemistry, RNA, Messenger analysis, Tretinoin pharmacology, Tumor Cells, Cultured, Brain embryology, Cell Differentiation, Gene Expression drug effects, Kinesins genetics, Neurons cytology
Abstract

KIF3A, KIF3B and KIF3C are kinesin-related motor subunits of the KIF3 family that associate to form the kinesin-II motor complex in which KIF3C and KIF3B are alternative partners of KIF3A. We have analysed the expression of Kif3 mRNAs during prenatal murine development. Kif3c transcripts are detectable from embryonic day 12.5 and persist throughout development both in the CNS and in some peripheral ganglia. Comparison of the expression patterns of the Kif3 genes revealed that Kif3c and Kif3a mRNAs colocalize in the CNS, while only Kif3a is also present outside the CNS. In contrast, Kif3b is detectable in several non-neural tissues. We have also performed immunocytochemical analyses of the developing rat brain and have found the presence of the KIF3C protein in selected brain regions and in several fibre systems. Using neuroblastoma cells as an in vitro model for neuronal differentiation, we found that retinoic acid stimulated the expression of the three Kif3 and the kinesin-associated protein genes, although with different time courses. The selective expression of Kif3c in the nervous system during embryonic development and its up-regulation during neuroblastoma differentiation suggest a role for this motor during maturation of neuronal cells.

Published
2001
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