46 results on '"Wolska, B"'
Search Results
2. 'Now we can drink, too': changing drinking practices among Polish- Australian women
- Author
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Hunt, L, Saggers, S, and Wolska, B
- Published
- 2004
3. Differential effects of isoflurane and ketamine/inactin anesthesia on cAMP and cardiac function in FVB/N mice during basal state and β–adrenergic stimulation
- Author
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Peña, J. R. and Wolska, B. M.
- Published
- 2005
- Full Text
- View/download PDF
4. Net transsarcolemmal Ca2+ shifts versus Ca/Ca exchange in guinea pig ventricular muscle
- Author
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Wolska, B. M. and Lewartowski, B.
- Published
- 1990
- Full Text
- View/download PDF
5. The European internet-based patient and research database for primary immunodeficiencies: results 2006-2008
- Author
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Gathmann B., Grimbacher B., Beauté J., Dudoit Y., Mahlaoui N., Fischer A., Knerr V., Kindle G., Micol R., Benslama L., Plebani A., Notarangelo L., PIGNATA, CLAUDIO, Bangs C., Lucas M., Tierney P., Core C., Dempster J., Exley A., Kumararatne D., Paschenko O., Kondratenko I., Shcherbina A., Velbri S., Ciznar P., Duobiene R., Kilic S., Kütükcüler N., Sanal O., Reisli I., Yegin O., Kanariou M., Papadopoulou Alataki E., Trachana M., Hatzistilianou M., Farber C.M., Meyts I., Pasic S., Richter D., Marodi L., Touitou I., Abuzakouk M., Feighery C., Thon V., Litzman J., Cucuruz M., Wolska B., Szaflarska A., Reda S., Soler P., Caragol I., Llobet P., Savchak I., Marques L., Koren A., Hörnes M., Shchebet S., Goldacker S., Ritterbusch H., Fasshauer M., Sollinger F., Witte T., Baumann U., Wittkowski H., Viemann D., Niehues T., Stimm H., Brodszki N., Institut de génétique humaine (IGH), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Gathmann, B., Grimbacher, B., Beauté, J., Dudoit, Y., Mahlaoui, N., Fischer, A., Knerr, V., Kindle, G., Micol, R., Benslama, L., Plebani, A., Notarangelo, L., Pignata, Claudio, Bangs, C., Lucas, M., Tierney, P., Core, C., Dempster, J., Exley, A., Kumararatne, D., Paschenko, O., Kondratenko, I., Shcherbina, A., Velbri, S., Ciznar, P., Duobiene, R., Kilic, S., Kütükcüler, N., Sanal, O., Reisli, I., Yegin, O., Kanariou, M., Papadopoulou Alataki, E., Trachana, M., Hatzistilianou, M., Farber, C. M., Meyts, I., Pasic, S., Richter, D., Marodi, L., Touitou, I., Abuzakouk, M., Feighery, C., Thon, V., Litzman, J., Cucuruz, M., Wolska, B., Szaflarska, A., Reda, S., Soler, P., Caragol, I., Llobet, P., Savchak, I., Marques, L., Koren, A., Hörnes, M., Shchebet, S., Goldacker, S., Ritterbusch, H., Fasshauer, M., Sollinger, F., Witte, T., Baumann, U., Wittkowski, H., Viemann, D., Niehues, T., Stimm, H., and Brodszki, N.
- Subjects
Male ,Databases, Factual ,Quality Assurance, Health Care ,International Cooperation ,PID controller ,registry ,0302 clinical medicine ,Epidemiology ,Prevalence ,Immunology and Allergy ,Data Protection Act 1998 ,Registries ,Child ,ComputingMilieux_MISCELLANEOUS ,Password ,ESID ,0303 health sciences ,Immunoglobulins, Intravenous ,Middle Aged ,3. Good health ,Europe ,Identification (information) ,Child, Preschool ,Female ,The Internet ,epidemiology ,Adult ,medicine.medical_specialty ,Adolescent ,Immunology ,online database ,primary immunodeficiency ,Young Adult ,03 medical and health sciences ,medicine ,Humans ,Aged ,030304 developmental biology ,Internet ,business.industry ,Immunologic Deficiency Syndromes ,Infant, Newborn ,Online database ,Infant ,Original Articles ,medicine.disease ,[SDV.GEN.GH]Life Sciences [q-bio]/Genetics/Human genetics ,Primary immunodeficiency ,business ,030215 immunology - Abstract
Summary Primary immunodeficiencies (PID) are rare diseases; therefore transnational studies are essential to maximize the scientific outcome and to improve diagnosis and therapy. In order to estimate the prevalence of PID in Europe as well as to establish and evaluate harmonized guidelines for the diagnosis and treatment of PID, the European Society for Immunodeficiencies (ESID) has developed an internet-based database for clinical and research data on patients with PID. This database is a platform for epidemiological analyses as well as the development of new diagnostic and therapeutic strategies and the identification of novel disease-associated genes. Within 4 years, 7430 patients from 39 countries have been documented in the ESID database. Common variable immunodeficiency (CVID) represents the most common entity, with 1540 patients or 20·7% of all entries, followed by isolated immunoglobulin (Ig)G subclass deficiency (546 patients, 7·4%). Evaluations show that the average life expectancy for PID patients varies from 1 to 49 years (median), depending on the type of PID. The prevalence and incidence of PID remains a key question to be answered. As the registration progress is far from finished we can only calculate minimum values for PID, with e.g. France currently showing a minimum prevalence of 3·72 patients per 100 000 inhabitants. The most frequently documented permanent treatment is immunoglobulin replacement; 2819 patients (42% of all patients alive) currently receive this form of treatment.
- Published
- 2009
6. SIMILAR N-TERMINAL TRUNCATING RAG1 MUTATIONS GIVE RISE TO A BROAD SPECTRUM OF CLINICAL PHENOTYPES
- Author
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IJspeert, H., Driessen, G.J., Hartwig, N.G., Wolska, B., Kalwak, K., Pituch-Noworolska, A., Kondratenko, I., Montfrans, J.M. van, Krasowska, A., Mejstrikova, E., Lankester, A.C., Langerak, A.W., Gent, D.C. van, Dongen, J.M. van, and Burg, M. van der
- Published
- 2012
7. Transplantation in patients with SCID: mismatched related stem cells or unrelated cord blood?
- Author
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Fernandes, Jf, Rocha, V, Labopin, M, Neven, B, Moshous, D, Gennery, Ar, Friedrich, W, Porta, F, Diaz de Heredia, C, Wall, D, Bertrand, Y, Veys, P, Slatter, M, Schulz, A, Chan, Kw, Grimley, M, Ayas, M, Gungor, T, Ebell, W, Bonfim, C, Kalwak, K, Taupin, P, Blanche, S, Gaspar, Hb, Landais, P, Fischer, A, Gluckman, E, Cavazzana Calvo, M, Eurocord, Inborn Errors Working Party of European Group for Blood, Marrow Transplantation: Ahmed, A, Auiti, A, Biffi, A, Cant, A, Fasth, A, Gennery, A, Hassan, A, Lankester, A, O'Mera, A, Plabani, A, Rovelli, A, Salmon, A, Scarselli, A, Thrasher, A, Van Royen, A, Villa, A, Wawer, A, Wahadneh, A, Worth, A, Belohradsky, B, Wolska, B, Gaspar, B, Bonfirm, C, Booth, C, Klein, C, Messina, C, Peters, C, Steward, C, Lindemans, C, Schuetz, C, de Heredia Rubio CD, Bensoussan, D, Gleadow, D, Lilic, D, Gambineri, Eleonora, Smith, E, Aerts, F, Caracseghi, F, Roberts, G, Davies, G, Al Mousa, H, Jossanc, H, Ozsahim, H, Hirsch, I, Meyts, I, Tezcan, I, Mueller, I, Andresc, I, Boelens, J, Fernandes, J, Folloni, J, Keuhl, J, Reichenbach, J, Stary, J, Wachowiak, J, Xu Bayford, J, Cunha, Jm, Ehlert, J, Rao, K, Sykora, K, Andais, L, Brown, L, Dal Cortivo, L, Griffith, L, Notarangelo, L, Abinun, M, Albert, M, Bierings, M, Bouchet, M, Cavazzana, M, Hirschfield, M, Cowan, M, Hoenig, M, Loubser, M, Roncarolo, M, Sauer, M, Schneider, M, Verstegen, M, Schroeder, M, Essink, M, Yesilipek, M, Entz Werle, N, Mahlaoui, N, Schlautmann, N, Taylor, N, Vanroyen, N, Walffraat, N, Sanal, O, Amrolia, P, Bordigoni, P, De Coppi, P, Frange, P, Orchard, P, Sedlacek, P, Shaw, P, Stephensky, P, Bacchetta, R, Bredius, R, Formankova, R, Gale, R, Seger, R, Wynn, R, Corbacioglu, S, Ehl, S, Hacein Bey, S, Hambleton, S, Mohsen, S, Mueller, S, Pai, Sy, Espanol, T, Flood, T, Guengoer, T, Bordon, V, Ormoor, V, Pashano, V, Courteille, V, Czogala, W, Qasim, W, Camci, Y, and Nademi, Z.
- Subjects
Male ,medicine.medical_specialty ,Transplantation Conditioning ,medicine.medical_treatment ,Immunology ,Graft vs Host Disease ,Kaplan-Meier Estimate ,Cord Blood Stem Cell Transplantation ,Hematopoietic stem cell transplantation ,Biochemistry ,Gastroenterology ,SCID HSCT ,Internal medicine ,medicine ,Humans ,Proportional Hazards Models ,Retrospective Studies ,Preparative Regimen ,Severe combined immunodeficiency ,business.industry ,Umbilical Cord Blood Transplantation ,Incidence ,Hematopoietic Stem Cell Transplantation ,Infant, Newborn ,Infant ,Cell Biology ,Hematology ,medicine.disease ,Surgery ,Transplantation ,Treatment Outcome ,Child, Preschool ,Histocompatibility ,Cord blood ,Female ,Severe Combined Immunodeficiency ,business - Abstract
Pediatric patients with SCID constitute medical emergencies. In the absence of an HLA-identical hematopoietic stem cell (HSC) donor, mismatched related-donor transplantation (MMRDT) or unrelated-donor umbilical cord blood transplantation (UCBT) are valuable treatment options. To help transplantation centers choose the best treatment option, we retrospectively compared outcomes after 175 MMRDTs and 74 UCBTs in patients with SCID or Omenn syndrome. Median follow-up time was 83 months and 58 months for UCBT and MMRDT, respectively. Most UCB recipients received a myeloablative conditioning regimen; most MMRDT recipients did not. UCB recipients presented a higher frequency of complete donor chimerism (P = .04) and faster total lymphocyte count recovery (P = .04) without any statistically significance with the preparative regimen they received. The MMRDT and UCBT groups did not differ in terms of T-cell engraftment, CD4+ and CD3+ cell recoveries, while Ig replacement therapy was discontinued sooner after UCBT (adjusted P = .02). There was a trend toward a greater incidence of grades II-IV acute GVHD (P = .06) and more chronic GVHD (P = .03) after UCBT. The estimated 5-year overall survival rates were 62% ± 4% after MMRDT and 57% ± 6% after UCBT. For children with SCID and no HLA-identical sibling donor, both UCBT and MMRDT represent available HSC sources for transplantation with quite similar outcomes.
- Published
- 2012
8. Differential effects of isoflurane and ketamine/inactin anesthesia on cAMP and cardiac function in FVB/N mice during basal state and ??adrenergic stimulation
- Author
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Pe�a, J. R., primary and Wolska, B. M., additional
- Published
- 2004
- Full Text
- View/download PDF
9. Multifunctional action of in situ formed Zn-salt of monoallylmaleamic acid
- Author
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Rzymski, W.M., primary, Wolska, B., additional, and Balicki, T., additional
- Published
- 2003
- Full Text
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10. Troponin I in the murine myocardium: influence on length-dependent activation and interfilament spacing
- Author
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Konhilas, J. P, primary, Irving, T. C, additional, Wolska, B. M, additional, Jweied, E. E, additional, Martin, A. F, additional, John Solaro, R, additional, and de Tombe, P. P, additional
- Published
- 2003
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11. The Effect of EMD 57033 is Decreased in Myofilaments from Transgenic Mouse Hearts over-expressing Slow Skeletal Troponin I (ssTnI) • 81
- Author
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Arteaga, G M, primary, Wolska, B M, additional, Martin, A F, additional, Kecskes, S A, additional, and Solaro, R J, additional
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- 1998
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12. Method for isolation of adult mouse cardiac myocytes for studies of contraction and microfluorimetry
- Author
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Wolska, B. M., primary and Solaro, R. J., additional
- Published
- 1996
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13. Effect of ablation of phospholamban on dynamics of cardiac myocyte contraction and intracellular Ca2+
- Author
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Wolska, B. M., primary, Stojanovic, M. O., additional, Luo, W., additional, Kranias, E. G., additional, and Solaro, R. J., additional
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- 1996
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14. Calcium in the in situ mitochondria of rested and stimulated myocardium
- Author
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Wolska, B, primary
- Published
- 1991
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15. Quinolinic acid: a modulator of the heart calcium channel in the rat and a binder of calcium ions
- Author
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Beskid, M., primary, Finkiewicz-Murawiejska, L., additional, Obminski, Z., additional, and Wolska, B., additional
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- 1991
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16. Quinolinic acid: Effect on 45Ca content in perfused rat heart preparations and its calcium ion binding property in Krebs-Henseleit medium and blood serum
- Author
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Beskid, M., primary, Finkiewicz-Murawiejska, L., additional, Obminski, Z., additional, and Wolska, B., additional
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- 1991
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17. 'Now we can drink, too': changing drinking practices among Polish-Australian women.
- Author
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Wolska B, Saggers S, and Hunt L
- Published
- 2004
18. A4 amyloid protein deposition and the diagnosis of Alzheimer's disease.
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Davies, L., Wolska, B., Hilbich, C., Multhaup, G., Martins, R., Simms, G., Beyreuther, K., and Masters, C. L.
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- 1988
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19. Multifunctional action of in situformed Zn‐salt of monoallylmaleamic acid
- Author
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Rzymski, W.M., Wolska, B., and Balicki, T.
- Abstract
Monoallylmaleamic acid (CH2=CH‐CH”2‐NH‐CO‐CH=CH‐CO‐OH; MAMA) when used in combination with zinc basic carbonate (ZBC) shows multifunctional action during processing and peroxide curing of hydrogenated nitrile rubber (HNBR). It follows from the lower viscosity, higher crosslinking degree and higher tensile strength of samples prepared from HNBR, MAMA, ZBC and peroxide, compared with the HNBR cured with the peroxide only. This kind of activity of the such system is connected with the in situformation of very small particles of Zn‐MAMA salt dispersed in the rubber matrix and in part chemically bound to the rubber.
- Published
- 2003
- Full Text
- View/download PDF
20. Net transsarcolemmal Ca2+ shifts versus Ca/Ca exchange in guinea pig ventricular muscle
- Author
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Wolska, B. M. and Lewartowski, B.
- Abstract
Summary We investigated the net transsarcolemmal Ca
2+ shifts and Ca/Ca exchange by means of45 Ca in isolated, perfused ventricles of guinea pig heart treated with vanadate to inhibit ATP-driven sarcolemmal Ca2+ pump. The heart was stimulated (at the rate of 60/min) and perfused with a solution containing45 Ca for 60 min. Thereafter stimulation was stopped and either perfusion with radioactive solution was continued or the solution was exchanged for a non-radioactive one. In the first case, tissue45 Ca content (equivalent to the exchangeable Ca2+ content) dropped from 1.960±0.120 mmol/kg of wet weight (w.w.) to 0.715±0.049 mmol/kg w.w. and stabilized at this level between 5th and 10th min. In the second case, decrease in45 Ca content continued and within 40 min attained 0.047±0.004 mmol/kg w.w., despite stabilizing of the total exchangeable Ca2+ content. Drop of45 Ca content in the rested heart perfused (until the end of experiments) with radioactive solution resulted from the net transsarcolemmal Ca2+ shift and it was strongly inhibited by removal of extracellular Na+ . The continuing drop in45 Ca content in the heart perfused with non-radioactive solution while total Ca2+ content stabilized must have resulted from Ca/Ca exchange; it was stimulated by removal of extracellular Na+ . These experiments separate two modes of45 Ca fluxes and suggest that a common route of these fluxes is the Na/Ca exchanger.- Published
- 1990
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21. Diarrhoea protracta in children with immunology deficiency,Biegunka przewlekła u dzieci z niedoborami immunologicznymi
- Author
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Popińska, K., Światkowska, E., Łyszkowska, M., Wolska, B., Cielecka-Kuszyk, J., Janusz Ksiazyk, Bernatowska, E., and Socha, J.
22. Multiple cryosauna sessions for post-exercise recovery of delayed onset muscle soreness (DOMS): a randomized control trial.
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Wolska B, Domagała Ł, Kisilewicz A, Hassanlouei H, Makar P, Kawczyński A, and Klich S
- Abstract
The main goal was to investigate the effectiveness of cryosauna in preventing the development of delayed onset muscle soreness and to analyze the regenerative changes within muscles after acute fatigue-induced exercises. Thirty-one volunteers were assigned into two groups: 1) an intervention group that participated in cryostimulation after fatigue-induced exercise protocol (CRYO, n = 16) and a control group that performed fatigue-induced exercise protocol, but without any intervention (CONT, n = 15). Main outcome measures include at baseline: blood sample testing (leukocyte content, myoglobin concentration, and creatine kinase activity) and muscle stiffness of lower extremity; immediately after (stiffness), and 24-48-72-96 h post-exercise (blood samples and stiffness). Both groups performed an exercise-induced muscle damage protocol based on repeated countermovement jumps (10 sets, 10 repetitions). The CRYO group underwent a cryosauna (temperature: -110°C, time: 1.5 min per session) intervention during four sessions (i.e., immediately after, 24-48-72 h post-exercise). Leukocyte content was significantly greater 24-48-72 h after exercise in CONT, compared with the CRYO group ( p ≤ 0.05 for all), while creatine kinase activity was greater 24-48-96 h in CONT, compared with the CRYO group ( p ≤ 0.05 for all). Muscle stiffness increased significantly in rectus femoris, tibialis anterior, and fibula muscle after 48 h post-exercise ( p ≤ 0.05 for all), as well as in tibialis anterior and fibula after 72 h post-exercise ( p ≤ 0.05 for all) in the CRYO group. Multiple cryosauna was an effective recovery strategy that reduced blood biomarkers and muscle stiffness after exercise-induced muscle damage. Moreover, the development of delayed onset muscle soreness, expressed by a greater muscle stiffness post-exercise, was attenuated to the first 48 h., 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 © 2023 Wolska, Domagała, Kisilewicz, Hassanlouei, Makar, Kawczyński and Klich.)
- Published
- 2023
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23. Reaching new heights: Testing the performance of metric approaches to estimate stature from burned skeletal remains.
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Wolska B, Vassalo AR, Marques MPM, Esteves Batista de Carvalho L, and Gonçalves D
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- Humans, Femur anatomy & histology, Body Height, Lower Extremity, Humerus, Forensic Anthropology methods, Body Remains, Burns
- Abstract
Bone heat-induced changes complicate osteometric stature estimation of human remains from forensic settings. The validity of current methods has not been tested to a great extent. Our aim was to determine how precise are stature estimations obtained from three different approaches, namely by using (i) Rösing's method (Rösing 1977), (ii) a 10% shrinkage correction factor (Strzałko et al. 1972) and (iii) chemosteometry (Gonçalves et al. 2020). For this purpose, pre- and post-burned head measurements from the humerus, radius and femur were used. The sample comprised 46 human skeletons of known sex and age-at-death. These were experimentally burnt to maximum temperatures ranging from 700 to 1100°C (attained after 90-188 min) for other research purposes. Stature estimations were performed through measurements in both pre-burned and burned bones using the three approaches and based on the method of Olivier and Tissier (1975). Mean absolute differences and the relative technical errors of measurements (TEM%) between the pre-burned and the estimations were calculated. Absolute mean differences indicated that the chemosteometric approach allowed for potentially more precise stature estimations than the other two procedures. However, the TEM% was very low for all approaches (smaller or close to 1%), and stature estimations were thus well within the error margin reported by Olivier and Tissier (1975). Results suggest that the chemosteometric approach enables more accurate predictions of the actual heat-induced shrinkage of each bone thus rendering more precise stature estimations. Nonetheless, the other procedures also provided quite reliable estimations although they require confirmation that the bone is calcined., (© 2022 American Academy of Forensic Sciences.)
- Published
- 2023
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24. Adaptive Coronary Artery Rotational Motion Through Uncaging of a Drug-Eluting Bioadaptor Aiming to Reduce Stress on the Coronary Artery.
- Author
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Kansal MM, Wolska B, Verheye S, and Vidovich MI
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- Coronary Angiography, Coronary Vessels diagnostic imaging, Humans, Treatment Outcome, Ultrasonography, Interventional, Coronary Artery Disease diagnostic imaging, Coronary Artery Disease etiology, Coronary Artery Disease therapy, Drug-Eluting Stents, Percutaneous Coronary Intervention adverse effects, Percutaneous Coronary Intervention methods
- Abstract
Background: Caged drug-eluting stents impede natural coronary rotational motion and increase vessel stress, which can contribute towards adverse events. The DynamX™ Drug-Eluting Bioadaptor is a cobalt‑chromium platform with a novel mechanism that uncages the vessel after the bioresorbable coating resorbs over six months. This study aimed to analyze the effects of the rotational uncaging in a finite element analysis (FEA) model, validating its effect on coronary artery rotational motion through in-vivo stationary intravascular ultrasound (IVUS)., Methods: Maximum Von Mises stresses were measured in an FEA model and compared for caged and uncaged bioadaptors. Stationary IVUS images from 20 patients enrolled in a single center were acquired post implantation and at 9-12-month follow-up to evaluate coronary artery rotational motion., Results: The FEA model showed that rotational uncaging of the bioadaptor reduces peak stress by 70%. In-vivo, the in-bioadaptor segment was significantly distorted post-implant compared to the native distal and proximal vessel, measured by IVUS: The sum of clockwise and counterclockwise rotational motion (net-effect rotational motion) was -2.7 ± 4.3° versus 0.5 ± 5.0° (proximal vessel), p = 0.036, and versus 0.2 ± 3.8° (distal vessel), p = 0.042. At follow up, when the bioadaptor had uncaged, the vessel returned towards its equilibrium (net-effect rotational motion -0.2 ± 5.6°), with no significant difference between the vessel segments., Conclusions: In concurrence with the FEA observation, the in-vivo IVUS-analysis demonstrates that uncaging of the bioadaptor affects coronary artery rotational motion. The effect of these findings on reducing clinical events warrants further investigation., Competing Interests: Declaration of competing interest M.K. reports consulting fees from Elixir Medical, S.V. reports consulting fees from Neovasc outside the submitted work and consulting fees from Elixir Medical. M.V. reports royalty payments from Merit Medical, and research grants from Boston Scientific. All other authors reported no conflict of interest., (Copyright © 2021 The Author(s). Published by Elsevier Inc. All rights reserved.)
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- 2022
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25. Excitation-contraction coupling in ventricular myocytes is enhanced by paracrine signaling from mesenchymal stem cells.
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DeSantiago J, Bare DJ, Semenov I, Minshall RD, Geenen DL, Wolska BM, and Banach K
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- Animals, Calcium metabolism, Cells, Cultured, Mice, Mice, Inbred C57BL, Mice, Knockout, Proto-Oncogene Proteins c-akt metabolism, Signal Transduction, Excitation Contraction Coupling physiology, Heart Ventricles metabolism, Mesenchymal Stem Cells metabolism, Myocytes, Cardiac metabolism, Paracrine Communication physiology
- Abstract
In clinical trials mesenchymal stem cells (MSCs) are transplanted into cardiac ischemic regions to decrease infarct size and improve contractility. However, the mechanism and time course of MSC-mediated cardioprotection are incompletely understood. We tested the hypothesis that paracrine signaling by MSCs promotes changes in cardiac excitation-contraction (EC) coupling that protects myocytes from cell death and enhances contractility. Isolated mouse ventricular myocytes (VMs) were treated with control tyrode, MSC conditioned-tyrode (ConT) or co-cultured with MSCs. The Ca handling properties of VMs were monitored by laser scanning confocal microscopy and whole cell voltage clamp. ConT superfusion of VMs resulted in a time dependent increase of the Ca transient amplitude (ConT(15min): ΔF/F(0)=3.52±0.38, n=14; Ctrl(15min): ΔF/F(0)=2.41±0.35, n=14) and acceleration of the Ca transient decay (τ: ConT: 269±18ms n=14; vs. Ctrl: 315±57ms, n=14). Voltage clamp recordings confirmed a ConT induced increase in I(Ca,L) (ConT: -5.9±0.5 pA/pF n=11; vs. Ctrl: -4.04±0.3 pA/pF, n=12). The change of τ resulted from increased SERCA activity. Changes in the Ca transient amplitude and τ were prevented by the PI3K inhibitors Wortmannin (100nmol/L) and LY294002 (10μmol/L) and the Akt inhibitor V (20μmol/L) indicating regulation through PI3K signal transduction and Akt activation which was confirmed by western blotting. A change in τ was also prevented in eNOS(-/-) myocytes or by inhibition of eNOS suggesting an NO mediated regulation of SERCA activity. Since paracrine signaling further resulted in increased survival of VMs we propose that the Akt induced change in Ca signaling is also a mechanism by which MSCs mediate an anti-apoptotic effect., (Published by Elsevier Ltd.)
- Published
- 2012
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26. Expression of slow skeletal troponin I in adult transgenic mouse heart muscle reduces the force decline observed during acidic conditions.
- Author
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Wolska BM, Vijayan K, Arteaga GM, Konhilas JP, Phillips RM, Kim R, Naya T, Leiden JM, Martin AF, de Tombe PP, and Solaro RJ
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- Acidosis physiopathology, Animals, Animals, Newborn, Calcium metabolism, Epitopes physiology, Hydrogen-Ion Concentration, In Vitro Techniques, Isometric Contraction physiology, Mice, Mice, Transgenic, Muscle Contraction physiology, Muscle Fibers, Skeletal physiology, Muscle Relaxation physiology, Myocardial Contraction physiology, Papillary Muscles physiology, Sarcoplasmic Reticulum metabolism, Muscle, Skeletal metabolism, Myocardium metabolism, Troponin I biosynthesis
- Abstract
1. Acidosis in cardiac muscle is associated with a decrease in developed force. We hypothesized that slow skeletal troponin I (ssTnI), which is expressed in neonatal hearts, is responsible for the observed decreased response to acidic conditions. To test this hypothesis directly, we used adult transgenic (TG) mice that express ssTnI in the heart. Cardiac TnI (cTnI) was completely replaced by ssTnI either with a FLAG epitope introduced into the N-terminus (TG-ssTnI) or without the epitope (TG-ssTnI) in these mice. TG mice that express cTnI were also generated as a control TG line (TG-cTnI). Non-transgenic (NTG) littermates were used as controls. 2. We measured the force-calcium relationship in all four groups at pH 7.0 and pH 6.5 in detergent-extracted fibre bundles prepared from left ventricular papillary muscles. The force-calcium relationship was identical in fibre bundles from NTG and TG-cTnI mouse hearts, therefore NTG mice served as controls for TG-ssTnIand TG-ssTnI mice. Compared to NTG controls, the force generated by fibre bundles from TG mice expressing ssTnI was more sensitive to Ca(2+). The shift in EC(50) (the concentration of Ca(2+) at which half-maximal force is generated) caused by acidic pH was significantly smaller in fibre bundles isolated from TG hearts compared to those from NTG hearts. However, there was no difference in the force-calcium relationship between hearts from the TG-ssTnIand TG-ssTnI groups. 3. We also isolated papillary muscles from the right ventricle of NTG and TG mouse hearts expressing ssTnI and measured isometric force at extracellular pH 7.33 and pH 6.75. At acidic pH, after an initial decline, twitch force recovered to 60 +/- 3 % (n = 7) in NTG papillary muscles, 98 +/- 2 % (n = 5) in muscles from TG-ssTnIand 96 +/- 3 % (n = 7) in muscles from TG-ssTnI hearts. Our results indicate that TnI isoform composition plays a crucial role in the determination of myocardial force sensitivity to acidosis.
- Published
- 2001
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27. Anti-adrenergic effects of nitric oxide donor SIN-1 in rat cardiac myocytes.
- Author
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Stojanovic MO, Ziolo MT, Wahler GM, and Wolska BM
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- Animals, Calcium metabolism, Calcium-Binding Proteins metabolism, Enzyme Inhibitors pharmacology, Free Radical Scavengers pharmacology, Humans, Molsidomine analogs & derivatives, Muscle Contraction drug effects, Myocardium cytology, Myosin Light Chains metabolism, Oxadiazoles pharmacology, Phosphorylation, Rats, Superoxide Dismutase pharmacology, Troponin I metabolism, Adrenergic beta-Agonists pharmacology, Isoproterenol pharmacology, Molsidomine pharmacology, Myocardium metabolism, Nitric Oxide Donors pharmacology
- Abstract
We studied how the nitric oxide (NO*) donor 3-morpholinosydnonimine (SIN-1) alters the response to beta-adrenergic stimulation in cardiac rat myocytes. We found that SIN-1 decreases the positive inotropic effect of isoproterenol (Iso) and decreases the extent of both cell shortening and Ca2+ transient. These effects of SIN-1 were associated with an increased intracellular concentration of cGMP, a decreased intracellular concentration of cAMP, and a reduction in the levels of phosphorylation of phospholamban (PLB) and troponin I (TnI). The guanylyl cyclase inhibitor 1H-8-bromo-1,2,4-oxadiazolo (3,4-d)benz(b)(1,4)oxazin-1-one (ODQ) was not able to prevent the SIN-1-induced reduction of phosphorylation levels of PLB and TnI. However, the effects of SIN-1 were abolished in the presence of superoxide dismutase (SOD) or SOD and catalase. These data suggest that, in the presence of Iso, NO-related congeners, rather than NO*, are responsible for SIN-1 effects. Our results provide new insights into the mechanism by which SIN-1 alters the positive inotropic effects of beta-adrenergic stimulation.
- Published
- 2001
- Full Text
- View/download PDF
28. Increased contractility and altered Ca(2+) transients of mouse heart myocytes conditionally expressing PKCbeta.
- Author
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Huang L, Wolska BM, Montgomery DE, Burkart EM, Buttrick PM, and Solaro RJ
- Subjects
- Aging, Animals, Calcium metabolism, Calcium-Binding Proteins metabolism, Cells, Cultured, Gene Expression Regulation, Enzymologic, Heart growth & development, Isoenzymes genetics, Mice, Mice, Transgenic, Myocardium cytology, Phosphates metabolism, Phosphorylation, Protein Kinase C genetics, Protein Kinase C beta, Calcium Signaling physiology, Heart physiology, Isoenzymes metabolism, Myocardial Contraction physiology, Protein Kinase C metabolism
- Abstract
Activation of protein kinase C (PKC) in heart muscle signals hypertrophy and may also directly affect contractile function. We tested this idea using a transgenic (TG) mouse model in which conditionally expressed PKCbeta was turned on at 10 wk of age and remained on for either 6 or 10 mo. Compared with controls, TG cardiac myocytes demonstrated an increase in the peak amplitude of the Ca(2+) transient, an increase in the extent and rate of shortening, and an increase in the rate of relengthening at both 6 and 10 mo of age. Phospholamban phosphorylation and Ca(2+)-uptake rates of sarcoplasmic reticulum vesicles were the same in TG and control heart preparations. At 10 mo, TG skinned fiber bundles demonstrated the same sensitivity to Ca(2+) as controls, but maximum tension was depressed and there was increased myofilament protein phosphorylation. Our results differ from studies in which PKCbeta was constitutively overexpressed in the heart and in studies that reported a depression of myocyte contraction with no change in the Ca(2+) transient.
- Published
- 2001
- Full Text
- View/download PDF
29. Altered hemodynamics in transgenic mice harboring mutant tropomyosin linked to hypertrophic cardiomyopathy.
- Author
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Evans CC, Pena JR, Phillips RM, Muthuchamy M, Wieczorek DF, Solaro RJ, and Wolska BM
- Subjects
- Actin Cytoskeleton drug effects, Actin Cytoskeleton metabolism, Adrenergic beta-Agonists pharmacology, Adrenergic beta-Antagonists pharmacology, Animals, Ca(2+) Mg(2+)-ATPase metabolism, Calcium metabolism, Calcium pharmacokinetics, Cyclic AMP-Dependent Protein Kinases metabolism, Cyclic AMP-Dependent Protein Kinases pharmacology, Dose-Response Relationship, Drug, Hemodynamics drug effects, In Vitro Techniques, Mice, Mice, Transgenic, Myocardial Contraction drug effects, Myocardial Contraction genetics, Papillary Muscles cytology, Papillary Muscles metabolism, Sarcoplasmic Reticulum genetics, Sarcoplasmic Reticulum metabolism, Tropomyosin metabolism, Ventricular Function, Left genetics, Cardiomyopathy, Hypertrophic genetics, Hemodynamics genetics, Point Mutation genetics, Tropomyosin genetics
- Abstract
We used transgenic (TG) mice overexpressing mutant alpha-tropomyosin [alpha-Tm(Asp175Asn)], linked to familial hypertrophic cardiomyopathy (FHC), to test the hypothesis that this mutation impairs cardiac function by altering the sensitivity of myofilaments to Ca(2+). Left ventricular (LV) pressure was measured in anesthetized nontransgenic (NTG) and TG mice. In control conditions, LV relaxation was 6,970 +/- 297 mmHg/s in NTG and 5,624 +/- 392 mmHg/s in TG mice (P < 0.05). During beta-adrenergic stimulation, the rate of relaxation increased to 8,411 +/- 323 mmHg/s in NTG and to 6,080 +/- 413 mmHg/s in TG mice (P < 0.05). We measured the pCa-force relationship (pCa = -log [Ca(2+)]) in skinned fiber bundles from LV papillary muscles of NTG and TG hearts. In control conditions, the Ca(2+) concentration producing 50% maximal force (pCa(50)) was 5.77 +/- 0.02 in NTG and 5.84 +/- 0.01 in TG myofilament bundles (P < 0.05). After protein kinase A-dependent phosphorylation, the pCa(50) was 5.71 +/- 0.01 in NTG and 5.77 +/- 0. 02 in TG myofilament bundles (P < 0.05). Our results indicate that mutant alpha-Tm(Asp175Asn) increases myofilament Ca(2+)-sensitivity, which results in decreased relaxation rate and blunted response to beta-adrenergic stimulation.
- Published
- 2000
- Full Text
- View/download PDF
30. Mouse model of a familial hypertrophic cardiomyopathy mutation in alpha-tropomyosin manifests cardiac dysfunction.
- Author
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Muthuchamy M, Pieples K, Rethinasamy P, Hoit B, Grupp IL, Boivin GP, Wolska B, Evans C, Solaro RJ, and Wieczorek DF
- Subjects
- Animals, Calcium physiology, Cardiomyopathy, Hypertrophic pathology, Homeostasis physiology, Mice, Mice, Transgenic genetics, Myocardial Contraction physiology, Myocardium pathology, Cardiomyopathy, Hypertrophic genetics, Cardiomyopathy, Hypertrophic physiopathology, Heart physiopathology, Mutation physiology, Tropomyosin genetics
- Abstract
To investigate the functional consequences of a tropomyosin (TM) mutation associated with familial hypertrophic cardiomyopathy (FHC), we generated transgenic mice that express mutant alpha-TM in the adult heart. The missense mutation, which results in the substitution of asparagine for aspartic acid at amino acid position 175, occurs in a troponin T binding region of TM. S1 nuclease mapping and Western blot analyses demonstrate that increased expression of the alpha-TM 175 transgene in different lines causes a concomitant decrease in levels of endogenous alpha-TM mRNA and protein expression. In vivo physiological analyses show a severe impairment of both contractility and relaxation in hearts of the FHC mice, with a significant change in left ventricular fractional shortening. Myofilaments that contain alpha-TM 175 demonstrate an increased activation of the thin filament through enhanced Ca2+ sensitivity of steady-state force. Histological analyses show patchy areas of mild ventricular myocyte disorganization and hypertrophy, with occasional thrombi formation in the left atria. Thus, the FHC alpha-TM transgenic mouse can serve as a model system for the examination of pathological and physiological alterations imparted through aberrant TM isoforms.
- Published
- 1999
- Full Text
- View/download PDF
31. Impaired cardiomyocyte relaxation and diastolic function in transgenic mice expressing slow skeletal troponin I in the heart.
- Author
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Fentzke RC, Buck SH, Patel JR, Lin H, Wolska BM, Stojanovic MO, Martin AF, Solaro RJ, Moss RL, and Leiden JM
- Subjects
- Animals, Calcium metabolism, Cyclic AMP-Dependent Protein Kinases pharmacology, Diastole physiology, Gene Expression, Intracellular Fluid metabolism, Isoproterenol pharmacology, Mice, Mice, Transgenic, Muscle, Skeletal physiology, Myocardial Contraction drug effects, Myocardium cytology, Myocardium metabolism, Phenotype, Tissue Distribution, Heart physiology, Myocardial Contraction physiology, Troponin I genetics, Troponin I physiology
- Abstract
1. To assess the specific functions of the cardiac isoform of troponin I (cTnI), we produced transgenic mice that expressed slow skeletal troponin I (ssTnI) specifically in cardiomyocytes. Cardiomyocytes from these mice displayed quantitative replacement of cTnI with transgene-encoded ssTnI. 2. The ssTnI transgenic mice were viable and fertile and did not display increased mortality or detectable cardiovascular histopathology. They exhibited normal ventricular weights and heart rates. 3. Permeabilized transgenic cardiomyocytes demonstrated an increased Ca2+ sensitivity of tension and a lack of contractile responsiveness to cAMP-dependent protein kinase (PKA). Isolated cardiomyocytes from transgenic mice had normal velocities of unloaded shortening but unlike wild-type controls exhibited no enhancement of the velocity of shortening in response to treatment with isoprenaline. Transgenic cardiomyocytes exhibited greater extents of shortening than non-transgenic cardiomyocytes at baseline and after treatment with isoprenaline. 4. The rates of rise of intracellular [Ca2+] and the peak amplitudes of the intracellular [Ca2+] transients were similar in transgenic and wild-type myocytes. However, the half-time of intracellular [Ca2+] decay was significantly greater in the transgenic myocytes. This change in decay of intracellular [Ca2+] was correlated with an increase in the re-lengthening time of the transgenic cells. 5. These changes in cardiomyocyte function in vitro were manifested in vivo as impaired diastolic function both at baseline and after stimulation with isoprenaline. 6. Thus, cTnI has important roles in regulating the Ca2+ sensitivity of cardiac myofibrils and controlling cardiomyocyte relaxation and cardiac diastolic function. cTnI is also required for the normal responsiveness of cardiomyocytes to beta-adrenergic receptor stimulation.
- Published
- 1999
- Full Text
- View/download PDF
32. Correlation between myofilament response to Ca2+ and altered dynamics of contraction and relaxation in transgenic cardiac cells that express beta-tropomyosin.
- Author
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Wolska BM, Keller RS, Evans CC, Palmiter KA, Phillips RM, Muthuchamy M, Oehlenschlager J, Wieczorek DF, de Tombe PP, and Solaro RJ
- Subjects
- Actin Cytoskeleton drug effects, Adenosine Triphosphatases metabolism, Animals, Gene Expression physiology, In Vitro Techniques, Mice, Mice, Inbred Strains, Mice, Transgenic, Muscle Contraction drug effects, Muscle Fibers, Skeletal cytology, Muscle Fibers, Skeletal drug effects, Muscle Fibers, Skeletal enzymology, Myocardium enzymology, Sarcomeres chemistry, Sarcomeres enzymology, Tropomyosin metabolism, Actin Cytoskeleton physiology, Calcium pharmacology, Muscle Contraction physiology, Myocardium cytology, Tropomyosin genetics
- Abstract
We compared the dynamics of the contraction and relaxation of single myocytes isolated from nontransgenic (NTG) mouse hearts and from transgenic (TG-beta-Tm) mouse hearts that overexpress the skeletal isoform of tropomyosin (Tm). Compared with NTG controls, TG-beta-Tm myocytes showed significantly reduced maximal rates of contraction and relaxation with no change in the extent of shortening. This result indicated that the depression in contraction dynamics determined in TG-beta-Tm isolated hearts is intrinsic to the cells. To further investigate the effect of Tm isoform switching on myofilament activity and regulation, we measured myofilament force and ATPase rate as functions of pCa (-log of [Ca2+]). Compared with controls, force generated by myofilaments from TG-beta-Tm hearts and myofibrillar ATPase activity were both more sensitive to Ca2+. However, the shift in pCa50 (half-maximally activating pCa) caused by changing sarcomere length from 1.8 to 2.4 microm was not significantly different between NTG and TG-beta-Tm fiber preparations. To test directly whether isoform switching affected the economy of contraction, force versus ATPase rate relationships were measured in detergent-extracted fiber bundles. In both NTG and TG-beta-Tm preparations, force and ATPase rate were linear and identically correlated, which indicated that crossbridge turnover was unaffected by Tm isoform switching. However, detergent extracted fibers from TG-beta-Tm demonstrated significantly less maximum tension and ATPase activity than NTG controls. Our results provide the first evidence that the Tm isoform population modulates the dynamics of contraction and relaxation of single myocytes by a mechanism that does not alter the rate-limiting step of crossbridge detachment. Our results also indicate that differences in sarcomere-length dependence of activation between cardiac and skeletal muscle are not likely due to differences in the isoform population of Tm.
- Published
- 1999
- Full Text
- View/download PDF
33. Molecular and physiological effects of alpha-tropomyosin ablation in the mouse.
- Author
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Rethinasamy P, Muthuchamy M, Hewett T, Boivin G, Wolska BM, Evans C, Solaro RJ, and Wieczorek DF
- Subjects
- Animals, Gene Deletion, Genes genetics, Heterozygote, Mice, Mice, Knockout, Mice, Transgenic, Mutagenesis, Site-Directed genetics, Protein Biosynthesis, RNA, Messenger analysis, RNA, Messenger genetics, RNA, Messenger metabolism, Tropomyosin genetics, Tropomyosin physiology
- Abstract
Tropomyosin (TM) is an integral component of the thin filament in muscle fibers and is involved in regulating actin-myosin interactions. TM is encoded by a family of four alternatively spliced genes that display highly conserved nucleotide and amino acid sequences. To assess the functional and developmental significance of alpha-TM, the murine alpha-TM gene was disrupted by homologous recombination. Homozygous alpha-TM null mice are embryonic lethal, dying between 8 and 11.5 days post coitum. Mice that are heterozygous for alpha-TM are viable and reproduce normally. Heterozygous knockout mouse hearts show a 50% reduction in cardiac muscle alpha-TM mRNA, with no compensatory increase in transcript levels by striated muscle beta-TM or TM-30 isoforms. Surprisingly, this reduction in alpha-TM mRNA levels in heterozygous mice is not reflected at the protein level, where normal amounts of striated muscle alpha-TM protein are produced and integrated in the myofibril. Quantification of alpha-TM mRNA bound in polysomal fractions reveals that both wild-type and heterozygous knockout animals have similar levels. These data suggest that a change in steady-state level of alpha-TM mRNA does not affect the relative amount of mRNA translated and amount of protein synthesized. Physiological analyses of myocardial and myofilament function show no differences between heterozygous alpha-TM mice and control mice. The present study suggests that translational regulation plays a major role in the control of TM expression.
- Published
- 1998
- Full Text
- View/download PDF
34. Changes in thyroid state affect pHi and Nai+ homeostasis in rat ventricular myocytes.
- Author
-
Wolska BM, Averyhart-Fullard V, Omachi A, Stojanović MO, Kallen RG, and Solaro RJ
- Subjects
- Animals, Heart Ventricles cytology, Heart Ventricles metabolism, Homeostasis, Hydrogen-Ion Concentration, Hyperthyroidism metabolism, Hypothyroidism metabolism, Male, Myocardial Contraction, RNA, Messenger, Rats, Rats, Sprague-Dawley, Sodium Channels genetics, Sodium Channels metabolism, Sodium-Calcium Exchanger metabolism, Sodium-Hydrogen Exchangers metabolism, Thyroid Hormones metabolism, Calcium metabolism, Myocardium metabolism, Sodium metabolism, Thyroid Gland metabolism
- Abstract
We have tested the hypothesis that thyroid state may influence both the flow of cellular Ca2+ and the myofilament response to Ca2+ by effects on intracellular pH (pHi) and Na+ (Nai+). Single cardiac myocytes isolated from hypothyroid, euthyroid and hyperthyroid animals were loaded with fura-2/AM (Cai2+ probe), BCECF/AM (pHi probe) or SBFI/AM (Nai+ probe). Compared with hypothyroid animals, myocytes isolated from hyperthyroid rat hearts demonstrated a significant: (1) increase in extent of shortening; (2) decrease in the time to peak contraction; (3) increase in the peak amplitude of the fura-2 fluorescence ratio; (4) decrease in pHi (DeltapHi=0. 19+/-0.05); and (5) increase in Nai+ (DeltaNai+=2.88+/-0.55 mM). We have also compared pHi in Langendorff perfused hypo- and hyperthyroid rat hearts using NMR. We have found that hyperthyroid hearts are 0.15+/-0.03 pH units more acidic than hypothyroid hearts. Analysis of mRNA levels demonstrated that hyperthyroidism increased expression of both the Na+/Ca2+ exchanger and Na+/H+ antiporter, and decreased expression of Na+ channel mRNAs. These changes appear partially responsible for the observed changes in Nai+ and pHi. Our results provide the first evidence that changes in cardiac contractility associated with altered thyroid state not only involve effects on Ca2+, but may also involve changes in the response of the myofilaments to Cai2+mediated by altered pHi and Nai+., (Copyright 1997 Academic Press Limited.)
- Published
- 1997
- Full Text
- View/download PDF
35. Phospholamban gene dosage effects in the mammalian heart.
- Author
-
Luo W, Wolska BM, Grupp IL, Harrer JM, Haghighi K, Ferguson DG, Slack JP, Grupp G, Doetschman T, Solaro RJ, and Kranias EG
- Subjects
- Adenosine Triphosphatases antagonists & inhibitors, Adenosine Triphosphatases metabolism, Animals, Calcium metabolism, Calcium-Binding Proteins metabolism, Female, Mice, Mice, Mutant Strains, Myocardial Contraction, Myocardium cytology, Myocardium metabolism, Sarcoplasmic Reticulum metabolism, Calcium-Binding Proteins genetics, Gene Dosage, Heart physiology
- Abstract
Phospholamban ablation has been shown to result in significant increases in cardiac contractile parameters and loss of beta-adrenergic stimulation. To determine whether partial reduction in phospholamban levels is also associated with enhancement of cardiac performance and to further examine the sensitivity of the contractile system to alterations in phospholamban levels, hearts from wild-type, phospholamban-heterozygous, and phospholamban-deficient mice were studied in parallel at the subcellular, cellular, and organ levels. The phospholamban-heterozygous mice expressed reduced cardiac phospholamban mRNA and protein levels (40 +/- 5%) compared with wild type mice. The reduced phospholamban levels were associated with significant decreases in the EC50 of the sarcoplasmic reticulum Ca2+ pump for CA2+ and increases in the contractile parameters of isolated myocytes and beating hearts. The relative phospholamban levels among wild-type, phospholamban-heterozygous, and phospholamban-deficient mouse hearts correlated well with the (1) EC50 of the Ca(2+)-ATPase for Ca2+ in sarcoplasmic reticulum, (2) rates of relaxation and contraction in isolated cardiac myocytes, and (3) rates of relaxation and intact beating hearts. These findings suggest that physiological and pathological changes in the levels of phospholamban will result in parallel changes in sarcoplasmic reticulum function and cardiac contraction.
- Published
- 1996
- Full Text
- View/download PDF
36. CGP-48506 increases contractility of ventricular myocytes and myofilaments by effects on actin-myosin reaction.
- Author
-
Wolska BM, Kitada Y, Palmiter KA, Westfall MV, Johnson MD, and Solaro RJ
- Subjects
- Actin Cytoskeleton metabolism, Animals, Calcium physiology, Diacetyl analogs & derivatives, Diacetyl pharmacology, Dogs, Dose-Response Relationship, Drug, Male, Myocardium cytology, Myocardium metabolism, Osmolar Concentration, Quinolines pharmacology, Rats, Rats, Sprague-Dawley, Thiadiazines pharmacology, Actin Cytoskeleton drug effects, Actins metabolism, Azocines pharmacology, Cardiotonic Agents pharmacology, Myocardial Contraction drug effects, Myosins metabolism, Ventricular Function drug effects
- Abstract
We measured the effects of the benzodiazocine derivative, CGP-48506 (5-methyl-6-phenyl-1,3,5,6-tetrahydro-3,6-methano-1, 5-benzodiazocine-2,4-dione), on contraction of intact myocytes and permeabilized fibers of rat ventricular muscle. CGP-48506 is unique in that it is able to sensitize cardiac myofilaments to Ca2+, but unlike all other agents in this class, it is not an inhibitor of type III phosphodiesterase. When added to isolated intact myocytes, CGP-48506 significantly increased the amplitude of cell shortening with little or no change in the Ca2+ transient, as determined by the fluorescence ratio of fura 2. The late phase of the relation between fura 2 ratio and cell length was shifted to the left in the presence of CGP-48506. CGP-48506 also induced a relatively small decrease in diastolic length. However, compared with the thiadiazinone EMD-57033, CGP-48506 had a much smaller effect on diastolic length at concentrations in which there was a bigger inotropic effect. When added to solutions bathing detergent-extracted (skinned) fiber bundles, CGP-48506 increased maximum force. CGP-48506 also increased submaximal force and shifted the pGa-force relation to the left. However, compared with EMD-57033, there was less of an effect of CGP-48506 on force at relatively high pCa values. CGP-48506 did not alter Ca2+ binding to myofilament troponin C. CGP-48506 was able to reverse inhibition of contraction induced by butanedione monoxime both in intact cells and in skinned fiber bundles. Our results indicate that CGP-48506, like EMD-57033, is a positive inotropic agent working through a direct effect downstream from troponin C. CGP-48506, however, appears to have a unique mechanism resulting in less effect on diastolic function.
- Published
- 1996
- Full Text
- View/download PDF
37. The effect of thapsigargin on sarcoplasmic reticulum Ca2+ content and contractions of single myocytes of rat ventricular myocardium.
- Author
-
Lewartowski B and Wolska B
- Subjects
- Animals, Heart Ventricles cytology, Histamine Release drug effects, In Vitro Techniques, Plant Extracts, Plants, Medicinal, Rats, Thapsigargin, Calcium metabolism, Heart Ventricles drug effects, Myocardial Contraction drug effects, Sarcoplasmic Reticulum drug effects, Terpenes pharmacology
- Abstract
The effect of Thapsigargin (TG) shown to block selectively the Ca(2+)-ATPase of sarcoplasmic reticulum (SR) on the SR Ca2+ content and contractions of single rat cadiomyocytes was investigated. In 80% of cells 10(-6) M TG blocked Ca2+ uptake by SR at rest, depleted the SR Ca2+, inhibited postrest potentiation and changed the pattern of response to premature contractions. Amplitude of steady state contractions was reduced to 11 +/- 4% of pre-TG control. In 20% of cells TG had similar effect on the SR function, however, amplitude of contractions was reduced to only 50 +/- 7% of control. It is concluded that the results obtained in 80% of the cells are compatible with the wide-spread notion that contractions of rat cardiac myocytes are activated predominantly by Ca2+ released from SR. However, population of myocytes of ventricular myocardium of this species is not homogeneous in this respect. In 20% of them contractions are activated by both sarcolemmal and SR Ca2+ contribution being approximately equal. These cells occupy intermediate position between guinea-pig cells and the bulk of rat cells.
- Published
- 1993
38. The effect of thapsigargin on sarcoplasmic reticulum Ca2+ content and contractions in single myocytes of guinea-pig heart.
- Author
-
Lewartowski B and Wolska BM
- Subjects
- Animals, Electric Stimulation, Guinea Pigs, In Vitro Techniques, Myocardial Contraction drug effects, Myocardium cytology, Myocardium metabolism, Sarcoplasmic Reticulum metabolism, Thapsigargin, Calcium metabolism, Calcium-Transporting ATPases antagonists & inhibitors, Heart drug effects, Sarcoplasmic Reticulum drug effects, Terpenes pharmacology
- Abstract
Contractures initiated by 1 s superfusion of single myocytes of guinea-pig heart with 10 mM caffeine were used as a relative index of the SR Ca2+ content. Thapsigargin (Tg) in concentration 2 x 10(-7) M completely blocked Ca2+ uptake during electrical stimulation by the SR from which Ca2+ has been previously depleted by caffeine. Tg did not affect the SR Ca2+ content in the resting myocytes and did not block release of the SR Ca2+ during electrically stimulated contractions (ESCs). It is concluded that in guinea-pig myocytes Tg affects SR Ca2+ by selective blocking the SR Ca2+ uptake. The amplitude of steady state ESCs dropped to 68 +/- 5.4% (S.D., n = 20) of that of the pre-Tg control. Time to peak contraction increased from 454 +/- 82.4 ms to 820 +/- 157.4 ms and time of relaxation increased from 368 +/- 90.8 ms to 474 +/- 87 ms after the SR Ca2+ has been depleted by Tg. Rest decay of contractions, post-extrasystolic potentiation and post-rest potentiation were inhibited.
- Published
- 1993
- Full Text
- View/download PDF
39. The role of sarcoplasmic reticulum and Na-Ca exchange in the Ca2+ extrusion from the resting myocytes of guinea-pig heart: comparison with rat.
- Author
-
Wolska BM and Lewartowski B
- Subjects
- Animals, Caffeine pharmacology, Calcium-Transporting ATPases metabolism, Female, Guinea Pigs, In Vitro Techniques, Ion Transport drug effects, Ion Transport physiology, Male, Myocardial Contraction drug effects, Myocardial Contraction physiology, Myocardium cytology, Rats, Species Specificity, Vanadates pharmacology, Calcium metabolism, Myocardium metabolism, Sarcoplasmic Reticulum metabolism, Sodium metabolism
- Abstract
Inhibition of the Na-Ca exchange at the beginning of rest in isolated myocytes of the guinea-pig heart by means of superfusion with Na,Ca-free solution or 5.0 mM Ni2+ resulted in appearance of multiple phasic contractures. Contractures could not be initiated when the sarcoplasmic reticulum (SR) Ca2+ had been depleted by short (1 s) or steady state exposure to 10 mM caffeine, 0.1 microM ryanodine or due to rapid spontaneous release of the SR Ca2+ occurring sometimes at the beginning of rest. Superfusion with 2 x 10(-7) M thapsigargin, which blocked the SR Ca2+ uptake, prevented contractures otherwise initiated by superfusion with the Na,Ca-free solution. The frequency of spontaneous contractures was positively related to the rate of stimulation before rest and negatively related to the duration of rest before superfusion with the Na,Ca-free solution. It is proposed that in guinea-pig myocardium Ca2+ taken up by the SR from sarcoplasm or other cellular compartments like mitochondria, is released during diastole and rest to the subsarcolemmal space from which it is extruded by means of Na-Ca exchange. The release is a primary event not dependent on decrease of the resting sarcoplasmic free [Ca2+] by the outward Ca2+ transport. Inhibition of the Na-Ca exchange at the beginning of rest did not initiate any contractile response in rat myocytes. If the spontaneous contractures were already present, they were inhibited by superfusion with the Na,Ca-free solution. The result reflects the basic difference in the properties of SR of guinea-pig and rat.
- Published
- 1993
- Full Text
- View/download PDF
40. The effects of blocking the Na-Ca exchange at intervals throughout the physiological contraction-relaxation cycle of single cardiac myocyte.
- Author
-
Lewartowski B, Wolska BM, and Zdanowski K
- Subjects
- Animals, Caffeine pharmacology, Calcium pharmacology, Calcium-Transporting ATPases drug effects, Calcium-Transporting ATPases physiology, Guinea Pigs, In Vitro Techniques, Ion Transport drug effects, Myocardial Contraction drug effects, Myocardium cytology, Myocardium metabolism, Perfusion, Sodium pharmacology, Solutions, Calcium metabolism, Myocardial Contraction physiology, Sodium metabolism
- Abstract
The method of rapid superfusion of the single isolated ventricular myocytes of guinea-pig heart was used in order to inhibit the Na-Ca exchange throughout the physiological contraction-relaxation cycle. Superfusion of the cell at selected intervals during the contraction with the Na,Ca-free solution resulted in increase in its amplitude, increase in time to peak shortening and in delay of relaxation, albeit the cells relaxed before reperfusion of normal Tyrode solution. The largest increase in amplitude of contraction (to 134 +/- 16%) was observed when the effective exchange of the cell's environment was attained approximately 50 ms after the pulse stimulating contraction. The effects declined promptly when the delay was increased beyond 100 ms. In the cells treated with 10 mM caffeine superfusion with the Na,Ca-free solution after the delay of 50-100 ms resulted in decrease in extent of shortening. Increase in delay resulted in slight increase in extent of shortening with respect to control and strong inhibition of relaxation. The strongest effects were observed when the delay was approximately 200 ms. Superfusion of the normal cells and of the cells treated with caffeine between contractions resulted in slight potentiation of the next beat. It is concluded that Na-Ca exchange provides an important mechanism of relaxation and outward Ca2+ transport in the physiological contraction of the ventricular cardiomyocyte.
- Published
- 1992
- Full Text
- View/download PDF
41. The effect of menadione on sarcoplasmic reticulum Ca2+ and contractions of single guinea-pig cardiomyocytes.
- Author
-
Lewartowski B, Zdanowski K, and Wolska BM
- Subjects
- Animals, Cell Separation, Electric Stimulation, Guinea Pigs, Myocardium cytology, Rest, Systole, Calcium metabolism, Myocardial Contraction, Myocardium metabolism, Sarcoplasmic Reticulum metabolism, Vitamin K pharmacology
- Abstract
We investigated the effect of 2-methyl-1,4-naphtoquinone (Menadione) on sarcoplasmic reticulum (SR) Ca2+ content and electrically stimulated contractions (ESCs) of single isolated myocytes of guinea-pig ventricular myocardium. The contractures initiated by means of microinjections of caffeine into the close vicinity of the cell were used as an indirect index of the SR Ca2+ content. Superfusion of the cells for 45 min with Menadione resulted in gradual disappearance of contractile responses to caffeine, prolongation of time to peak amplitude of ESCs by 48 +/- 15% and complete inhibition of postrest and postextrasystolic potentiation. These results are consistent with those of Floreani and Carpenedo (7) who found that Menadione strongly inhibits the SR Ca2+ ATPase. Despite depletion of the SR Ca2+ the amplitude of ESCs did not change which suggests that contractions were initiated in the cells treated with Menadione by Ca2+ derived from the sources other than the SR.
- Published
- 1991
42. Peptide-chain initiation activity of yeast ribosomal wash fraction.
- Author
-
Junosza-Wolska B, Jakubowicz T, and Gasior E
- Subjects
- Chromatography, DEAE-Cellulose, Fungal Proteins biosynthesis, Potassium Chloride, Peptide Chain Initiation, Translational, Ribosomes metabolism, Saccharomyces cerevisiae ultrastructure
- Published
- 1974
43. [Problems of social readaptation of mentally deeply deficient children in the light of sociometric studies].
- Author
-
Halaunbrenner J, Lysiak M, and Wolska B
- Subjects
- Adaptation, Psychological, Adolescent, Child, Child Psychiatry, Female, Humans, Male, Sociometric Techniques, Child Behavior Disorders rehabilitation, Education of Intellectually Disabled, Intellectual Disability rehabilitation
- Published
- 1969
44. [Tuberculosis masked by hematologic disorders].
- Author
-
Czernobielska W, Traczyk Z, and Wolska B
- Subjects
- Aged, Humans, In Vitro Techniques, Hematologic Diseases complications, Tuberculosis, Miliary complications
- Published
- 1966
45. The decomposition of veratrylglycerol-beta-coniferyl ether by Agrobacterium sp.
- Author
-
Trojanowski J, Wojtaś-Wasilewska M, and Junosza-Wolska B
- Subjects
- Chloroform, Chromatography, Paper, Cyclohexanes, Eugenol biosynthesis, Flavoring Agents biosynthesis, Formamides, Infrared Rays, Lignin chemical synthesis, Models, Chemical, Quinones biosynthesis, Spectrophotometry, Ultraviolet Rays, Lignin metabolism, Rhizobium metabolism
- Published
- 1970
46. The effect of Mg2+ and spermine on aminoacylation of tRNAphe by homologous and heterologous enzymes.
- Author
-
Jakubowicz T, Junosza-Wolska B, and Chmielewski T
- Subjects
- Acylation, Amino Acyl-tRNA Synthetases metabolism, Chromatography, DEAE-Cellulose, Escherichia coli enzymology, Phenylalanine, Saccharomyces cerevisiae enzymology, Magnesium pharmacology, RNA, Transfer, Spermine pharmacology
- Published
- 1973
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