The effect of diazepam on tension and electrolyte distribution in frog muscle

European Journal of Pharmacology
R C DegroofS Narayan

Abstract

The effect of diazepam on sartorius muscles of the frog was evaluated. Resting tension in sartorius muscle was not affected by diazepam (5 x 10(-5)M) but twitch tension was increased and tetanus tension decreased. The kinetics of 45Ca efflux were altered by diazepam. The calcium content of the intermediate pool was increased by diazepam (5 x 10(-6)M). When the diazepam concentration was increased (5 x 10(-5)M), the time constant of the slow pool decreased and the 45Ca content of the intermediate pool increased further. It is suggested that diazepam interferes with the calcium sequestering system of the sarcoplasmic reticulum (slow pool) and causes an increase of the calcium content of the myofibrillar space (intermediate pool).

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Citations

May 1, 1993·Naunyn-Schmiedeberg's Archives of Pharmacology·A DuvalT Piek
May 19, 1989·European Journal of Pharmacology·A De Mendonça, J A Ribeiro
Sep 1, 1986·Journal of the Neurological Sciences·M M JaweedJ F Ditunno
Apr 1, 1983·Acta Physiologica Scandinavica·A R Khan, K A Edman
Jan 1, 1988·Annals of the New York Academy of Sciences·L A HellandL A Wanek

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