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001-es BibID:	BIBFORM054413
Első szerző:	Kalász Judit (molekuláris biológus)
Cím:	Single acute stress-induced progesterone and ovariectomy alter cardiomyocyte contractile function in female rats / Judit Kalász, Enikő Pásztor Tóth, Beáta Bódi, Miklós Fagyas, Attila Tóth, Bhattoa Harjit Pal, Sándor G. Vári, Marta Balog, Senka Blažetić, Marija Heffer, Zoltán Papp, Attila Borbély
Dátum:	2014
ISSN:	0353-9504
Megjegyzések:	AIM:To assess how ovarian-derived sex hormones (in particular progesterone) modify the effects of single acute stress on the mechanical and biochemical properties of left ventricular cardiomyocytes in the rat.METHODS:Non-ovariectomized (control, n=8) and ovariectomized (OVX, n=8) female rats were kept under normal conditions or were exposed to stress (control-S, n=8 and OVX-S, n=8). Serum progesterone levels were measured using a chemiluminescent immunoassay. Left ventricular myocardial samples were used for isometric force measurements and protein analysis. Ca(2+)-dependent active force (Factive), Ca(2+)-independent passive force (Fpassive), and Ca(2+)-sensitivity of force production were determined in single, mechanically isolated, permeabilized cardiomyocytes. Stress- and ovariectomy-induced alterations in myofilament proteins (myosin-binding protein C [MyBP-C], troponin I [TnI], and titin) were analyzed by sodium dodecyl sulfate gel electrophoresis using protein and phosphoprotein stainings.RESULTS:Serum progesterone levels were significantly increased in stressed rats (control-S, 35.6?4.8 ng/mL and OVX-S, 21.9?4.0 ng/mL) compared to control (10?2.9 ng/mL) and OVX (2.8?0.5 ng/mL) groups. Factive was higher in the OVX groups (OVX, 25.9?3.4 kN/m(2) and OVX-S, 26.3?3.0 kN/m(2)) than in control groups (control, 16.4?1.2 kN/m(2) and control-S, 14.4?0.9 kN/m(2)). Regarding the potential molecular mechanisms, Factive correlated with MyBP-C phosphorylation, while myofilament Ca(2+)-sensitivity inversely correlated with serum progesterone levels when the mean values were plotted for all animal groups. Fpassive was unaffected by any treatment.CONCLUSION:Stress increases ovary-independent synthesis and release of progesterone, which may regulate Ca(2+)-sensitivity of force production in left ventricular cardiomyocytes. Stress and female hormones differently alter Ca(2+)-dependent cardiomyocyte contractile force production, which may have pathophysiological importance during stress conditions affecting postmenopausal women.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban stress, progesteron, cardiomyocytes
Megjelenés:	Croatian Medical Journal. - 55 : 3 (2014), p. 239-249. -
További szerzők:	Pásztorné Tóth Enikő (1966-) (laboratóriumi analitikus) Bódi Beáta (1989-) (molekuláris biológus) Fagyas Miklós (1984-) (orvos) Tóth Attila (1971-) (biológus) Bhattoa Harjit Pal (1973-) (laboratóriumi szakorvos) Vári Sándor G. Balog Márta Blažetić, Senka Heffer, Marija Papp Zoltán (1965-) (kardiológus, élettanász) Borbély Attila (1978-) (kardiológus)
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