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001-es BibID:	BIBFORM057409
Első szerző:	Kistamás Kornél (biológus)
Cím:	Changes in intracellular calcium concentration influence beat-to-beat variability of action potential duration in canine ventricular myocytes / K. Kistamas, N. Szentandrassy, B. Hegyi, K. Vaczi, F. Ruzsnavszky, B. Horvath, T. Banyasz, P.P. Nanasi, J. Magyar
Dátum:	2015
ISSN:	0867-5910
Megjegyzések:	The aim of the present work was to study the influence of changes in intracellular calcium concentration ([Ca2+]i) onbeat-to-beat variability (short term variability, SV) of action potential duration (APD) in isolated canine ventricularcardiomyocytes. Series of action potentials were recorded from enzymatically isolated canine ventricular cells usingconventional microelectrode technique. Drug effects on SV were evaluated as relative SV changes determined byplotting the drug-induced changes in SV against corresponding changes in APD and comparing these data to theexponential SV-APD function obtained with inward and outward current injections. Exposure of myocytes to the Ca2+chelator BAPTA-AM (5 ?M) decreased, while Ca2+ ionophore A23187 (1 ?M) increased the magnitude of relative SV.Both effects were primarily due to the concomitant changes in APD. Relative SV was reduced by BAPTA-AM undervarious experimental conditions including pretreatment with veratridine, BAY K8644, dofetilide or E-4031.Contribution of transient changes of [Ca2+]i due to Ca2+ released from the sarcoplasmic reticulum (SR) was studied using10 ?M ryanodine and 1 ?M cyclopiazonic acid: relative SV was reduced by both agents. Inhibition of the Na+-Ca2+exchanger by 1 ?M SEA0400 increased relative SV.It is concluded that elevation of [Ca2+]i increases relative SVsignificantly. More importantly, Ca2+ released from the SR is an important component of this effect.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban intracellular calcium concentration short term variability action potential duration cardiac ion currents myocytes
Megjelenés:	Journal of Physiology and Pharmacology. - 66 : 1 (2015), p. 73-81. -
További szerzők:	Szentandrássy Norbert (1976-) (élettanász) Hegyi Bence (1987-) (élettanász) Váczi Krisztina (1987-) (élettanász) Ruzsnavszky Ferenc (1984-) (élettanász) Horváth Balázs (1981-) (élettanász) Bányász Tamás (1960-) (élettanász) Nánási Péter Pál (1956-) (élettanász) Magyar János (1961-) (élettanász)
Pályázati támogatás:	K100151 OTKA K109736 OTKA K101196 OTKA PD101171 OTKA NK104331 OTKA TÁMOP-4.2.2.A-11/1/KONV-2012-0045 TÁMOP Élettan Kutatócsoport TÁMOP-4.2.2.A-11/1/KONV-2012-0045 TÁMOP
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
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