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001-es BibID:	BIBFORM096085
035-os BibID:	(WoS)000688514700002 (Scopus)85108233557 (PubMed)34089737
Első szerző:	Horváth Balázs (élettanász)
Cím:	Ion current profiles in canine ventricular myocytes obtained by the "onion peeling" technique / Horváth Balázs, Kiss Dénes, Dienes Csaba, Hézső Tamás, Kovács Zsigmond, Szentandrássy Norbert, Almássy János, Magyar János, Bányász Tamás, Nánási Péter P.
Dátum:	2021
ISSN:	0022-2828
Megjegyzések:	The profiles of ion currents during the cardiac action potential can be visualized by the action potential voltage clamp technique. To obtain multiple ion current data from the same cell, the "onion peeling" technique, based on sequential pharmacological dissection of ion currents, has to be applied. Combination of the two methods allows recording of several ion current profiles from the same myocyte under largely physiological conditions. Using this approach, we have studied the densities and integrals of the major cardiac inward (ICa, INCX, INa-late) and outward (IKr, IKs, IK1) currents in canine ventricular cells and studied the correlation between them. For this purpose, canine ventricular cardiomyocytes were chosen because their electrophysiological properties are similar to those of human ones. Significant positive correlation was observed between the density and integral of ICa and IKr, and positive correlation was found also between the integral of ICa and INCX. No further correlations were detected. The Ca2+-sensitivity of K+ currents was studied by comparing their parameters in the case of normal calcium homeostasis and following blockade of ICa. Out of the three K+ currents studied, only IKs was Ca2+-sensitive. The density and integral of IKs was significantly greater, while its time-to-peak value was shorter at normal Ca2+ cycling than following ICa blockade. No differences were detected for IKr or IK1 in this regard. Present results indicate that the positive correlation between ICa and IKr prominently contribute to the balance between inward and outward fluxes during the action potential plateau in canine myocytes. The results also suggest that the profiles of cardiac ion currents have to be studied under physiological conditions, since their behavior may strongly be influenced by the intracellular Ca2+ homeostasis and the applied membrane potential protocol.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk cardiac ion currents dog myocytes action potential voltage clamp sequential dissection of ionic currents onion peeling technique Ca2+ sensitive ion currents
Megjelenés:	Journal Of Molecular And Cellular Cardiology. - 158 (2021), p. 153-162. -
További szerzők:	Kiss Dénes Zsolt (1995-) (orvos, élettanász) Dienes Csaba (1995-) (gyógyszerész) Hézső Tamás (1993-) (élettanász) Kovács Zsigmond Máté (1995-) (orvos) Szentandrássy Norbert (1976-) (élettanász) Almássy János (1981-) (élettanász, biológus, angol-magyar szakfordító) Magyar János (1961-) (élettanász) Bányász Tamás (1960-) (élettanász) Nánási Péter Pál (1956-) (élettanász)
Pályázati támogatás:	FK128116 OTKA PD120794 NKFIH FK128116 NKFIH GINOP-2.3.2.-15-2016-00040 GINOP ÚNKP-20-2 Egyéb ÚNKP-20-3 Egyéb EFOP-3.6.3-VEKOP-16-2017-00009 EFOP
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001-es BibID:	BIBFORM083023
035-os BibID:	(WoS)000522138400002 (Scopus)85078193947 (PubMed)31958464
Első szerző:	Horváth Balázs (élettanász)
Cím:	Late sodium current in human, canine and guinea pig ventricular myocardium / Balázs Horváth, Tamás Hézső, Norbert Szentandrássy, Kornél Kistamás, Tamás Árpádffy-Lovas, Richárd Varga, Péter Gazdag, Roland Veress, Csaba Dienes, Dóra Baranyai, János Almássy, László Virág, Norbert Nagy, István Baczkó, János Magyar, Tamás Bányász, András Varró, Péter P. Nánási
Dátum:	2020
ISSN:	0022-2828
Megjegyzések:	Although late sodium current (INa-late) has long been known to contribute to plateau formation of mammalian cardiac action potentials, lately it was considered as possible target for antiarrhythmic drugs. However, many aspects of this current are still poorly understood. The present work was designed to study the true profile of INa-late in canine and guinea pig ventricular cells and compare them to INa-late recorded in undiseased human hearts. INa-late was defined as a tetrodotoxin-sensitive current, recorded under action potential voltage clamp conditions using either canonic- or self-action potentials as command signals. Under action potential voltage clamp conditions the amplitude of canine and human INa-late monotonically decreased during the plateau (decrescendo-profile), in contrast to guinea pig, where its amplitude increased during the plateau (crescendo profile). The decrescendo-profile of canine INa-late could not be converted to a crescendo-morphology by application of ramp-like command voltages or command action potentials recorded from guinea pig cells. Conventional voltage clamp experiments revealed that the crescendo INa-late profile in guinea pig was due to the slower decay of INa-late in this species. When action potentials were recorded from multicellular ventricular preparations with sharp microelectrode, action potentials were shortened by tetrodotoxin, which effect was the largest in human, while smaller in canine, and the smallest in guinea pig preparations. It is concluded that important interspecies differences exist in the behavior of INa-late. At present canine myocytes seem to represent the best model of human ventricular cells regarding the properties of INa-late. These results should be taken into account when pharmacological studies with INa-late are interpreted and extrapolated to human. Accordingly, canine ventricular tissues or myocytes are suggested for pharmacological studies with INa-late inhibitors or modifiers. Incorporation of present data to human action potential models may yield a better understanding of the role of INa-late in action potential morphology, arrhythmogenesis, and intracellular calcium dynamics.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Late Na+ current Ventricular repolarization Action potential voltage clamp Dog myocytes Human myocytes
Megjelenés:	Journal of Molecular and Cellular Cardiology. - 139 (2020), p. 14-23. -
További szerzők:	Hézső Tamás (1993-) (élettanász) Szentandrássy Norbert (1976-) (élettanász) Kistamás Kornél (1986-) (biológus) Árpádffy-Lovas Tamás Varga Richárd Gazdag Péter Veress Roland (1992-) (molekuláris biológus) Dienes Csaba (1995-) (gyógyszerész) Baranyai Dóra Almássy János (1981-) (élettanász, biológus, angol-magyar szakfordító) Virág László (élettanász Szeged) Nagy Norbert (1977-) (kísérletes farmakológus) Baczkó István Magyar János (1961-) (élettanász) Bányász Tamás (1960-) (élettanász) Varró András (1954-) (farmakológus, klinikai farmakológus) Nánási Péter Pál (1956-) (élettanász)
Pályázati támogatás:	GINOP-2.3.2.-15-2016-00040 GINOP EFOP-3.6.2-16-2017-00006 EFOP ÚNKP-19-4 Egyéb ÚNKP-19-2 Egyéb NKFIH-K115397 NKFIH NKFIH-PD120794 NKFIH NKFIH-FK128116 NKFIH
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