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Pflügers Archiv

, Volume 398, Issue 3, pp 236–240 | Cite as

The influence of catecholamines on Na, K transport in slow- and fast-twitch muscles of the rat

  • György Pfliegler
  • Imre Szabó
  • Tibor Kovács
Article

Abstract

The effects of catecholamines on active sodium and potassium transport was compared in slow- (SOL) and fasttwitch (EDL) skeletal muscles of the rat. Stimulation of active Na+-extrusion and K+-uptake induced by adrenaline (6–30 μmol · 1−1) and isoprenaline (1–40 μmol · l−1) was markedly greater in slow- than in fast-twitch muscle. In sodiumpreloaded muscles the maximal stimulation of24Na-efflux induced by adrenaline was about 2-fold higher in SOL than in EDL. Isoprenaline caused a 2.4-fold increase in ouabainsensitive86Rb influx in SOL muscle, but failed to alter the ouabain-sensitive influx in EDL. The stimulating action of isoprenaline on86Rb influx in EDL was due to an increase in the ouabain-insensitive fraction of Rb uptake. The effects of catecholamines of fast- and slow-twitch muscles were probably due to the accumulation of cyclic AMP, however the fact that there were no significant differences between the nucleotides levels in fast- and slow-twitch muscle suggests the participation of other mechanism as well. The results presented suggest that cyclic AMP-induced stimulation of ouabain-insensitive transport of cation in the isolated EDL muscle of the rat is similar to that of barnacle muscle.

Key words

Slow- and fast-twitch muscles Quabainsensitive and ouabain-insensitive86Rb influx 24Na and42K transport 

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Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • György Pfliegler
    • 1
  • Imre Szabó
    • 1
  • Tibor Kovács
    • 1
  1. 1.Department of PhysiologyUniversity Medical SchoolDebrecenHungary

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