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001-es BibID:	BIBFORM030280
Első szerző:	Nánási Péter Pál (élettanász)
Cím:	Effects of methylene blue and ascorbate on transmembrane potential in frog skeletal muscle / Péter P. Nánási, Mátyás Dely
Dátum:	1995
ISSN:	0306-3623
Megjegyzések:	1. The effects of methylene blue (MB, 10(-4) M) and ascorbate (ASC, 10(-4) M) on the resting membrane potential of frog skeletal muscle fibers were studied in Cl--free medium at various external K+ concentrations. 2. Muscle fibers formed two distinct populations according to their resting potentials (hyperpolarized to - 104 mV or depolarized to -31 mV) after a 90 min period of K+ withdrawal. ASC increased the relative contribution of hyperpolarized fibers, while in the presence of MB, all fibers depolarized during the 90 min of K+ withdrawal. 3. In the presence of 2.5 mM KC, ASC had no significant effect on the resting potential, while MB moved half of the fibers into the depolarized pool. Elevation of [K+](0) to 10 mM caused repolarization of all previously depolarized fibers (to -63 mV) in spite of the continuous presence of MB. 4. Ionic currents were measured during a 60 mV depolarization step using the double sucrose-gap technique. MB significantly increased the peak inward current, while ASC had no effect. The steady-state outward current was not affected by MB or ASC. 5. The results suggest that ionic conductances may be under redox control in frog skeletal muscle.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban egyetemen (Magyarországon) készült közlemény
Megjelenés:	General Pharmacology. - 26 : 6 (1995), p. 1307-1311. -
További szerzők:	Dely Mátyás
Internet cím:	DOI elektronikus változat Intézményi repozitóriumban (DEA) tárolt változat
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