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The Journal of General Physiology logoLink to The Journal of General Physiology
. 1978 Dec 1;72(6):775–800. doi: 10.1085/jgp.72.6.775

Nile blue fluorescence signals from cut single muscle fibers under voltage or current clamp conditions

PMCID: PMC2228492  PMID: 310445

Abstract

A method is presented for recording extrinsic optical signals from segments of single skeletal muscle fibers under current or voltage clamp conditions. Such segments, which are cut from intact fibers, are maintained in a relaxed state, while exhbiting otherwise normal physiological properties, including healthy delayed rectifier currents. Extrinsic fluorescence changes are demonstrated, using the permeant potentiometric probe, Nile Blue A. These changes vary nonlinearly with the controlled surface membrane potential, in a manner which suggests that they arise from potential changes in the sarcoplasmic reticulum. According to this interpretation, a simple model based on the gating charge movement implicated in excitation-contraction coupling, provides a self-consistent description of the voltage dependence of the signal that requires no additional parameters.

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