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  • Title: Sodium-dependent depolarizing potentials in veratrinized crayfish muscle fibres.
    Author: Lehouelleur J, Laszczyca P, Bruner J.
    Journal: Neurosci Lett; 1988 Jul 08; 89(3):299-304. PubMed ID: 3419629.
    Abstract:
    In the slow abdominal flexor muscle fibers of the crayfish Procambarus clarkii, veratrine or veratridine applied during several minutes produced the persistent transformation of the muscle fibre from a nonspiking into a Ca-dependent spiking one and spikes were followed by a long-duration depolarization. The long-duration potential depends on external Na+ but is not blocked by 30 microM tetrodotoxin (TTX). In solutions containing normal concentrations of Na+ (207 mM) the absence of Ca2+ or the presence of calcium channel blockers abolished both potentials. The results show that alkaloid toxins reveal a Ca2+-dependent, TTX-resistant Na+ conductance in crayfish tonic muscle fibres.
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