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Activation of ATP-sensitive K channels by a K channel opener (SR 44866) and the effect upon electrical and mechanical activity of frog skeletal muscle

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Abstract

To examine the effects of the activation of adenosine 5′-triphosphate (ATP)-sensitive K channels in a skeletal muscle we have applied the ATP-sensitive K channel opener SR44866 whilst recording single ion channels, voltage-clamped membrane currents, evoked action potentials and tension in sartorius muscles of the frog. In excised inside-out membrane patches SR44866 opened channels which could be inhibited by internal ATP and glibenclamide. In voltage-clamped individual muscle fibres SR44866 evoked a glibenclamide-sensitive membrane current which reversed at −70 mV. The effect of SR44866 was dose dependent with an effective concentration for 50% maximal effect (EC50) of 67 μM and a slope factor of 2. SR44866 dose dependently reduced the duration of the spike after-potential, spike overshoot, V max, tetrodotoxin-sensitive voltage-gated inward membrane currents and muscle twitch tension. From this evidence it can be concluded that the opening of ATP-sensitive K channels may be associated with the inhibition of contraction of skeletal muscle.

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Authors and Affiliations

  1. Laboratoire de Physiologie Comparée (URA CNRS 1121), Université de Paris XI, Bâtiment 443, F-91405, Orsay, France

    M. -P. Sauviat, E. Ecault, J. -F. Faivre & I. Findlay

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  1. M. -P. Sauviat
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  2. E. Ecault
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  3. J. -F. Faivre
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  4. I. Findlay
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Sauviat, M.P., Ecault, E., Faivre, J.F. et al. Activation of ATP-sensitive K channels by a K channel opener (SR 44866) and the effect upon electrical and mechanical activity of frog skeletal muscle. Pflügers Arch 418, 261–265 (1991). https://doi.org/10.1007/BF00370524

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  • DOI: https://doi.org/10.1007/BF00370524

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