Sodium inward currents through calcium channels in mealworm muscle fibers

Daisuke Yamamoto

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)


    The contribution of Na+ ions to the nonsynaptic electrogenesis was studied in the larval muscle fibers of mealworm, Tenebrio molitor, using currentclamp and voltage‐clamp techniques. Na‐dependent graded responses were generated by depolarizing current stimuli in Ca2+‐free solutions. These responses were insensitive to tetrodotoxin and were blocked by Co2+. Large inward‐going currents were elicited by step depolarizations in Ca2+‐free solutions under voltage‐clamp conditions. The inward currents were totally eliminated by removal of Na+ from the bathing solution. These results indicate that the calcium channel of mealworm muscle is permeable to Na+.

    Original languageEnglish
    Pages (from-to)227-231
    Number of pages5
    JournalArchives of Insect Biochemistry and Physiology
    Issue number4
    Publication statusPublished - 1987 Aug


    • Ca channel
    • Na spike
    • ion selectivity
    • mealworm
    • muscle membrane
    • voltage‐clamp

    ASJC Scopus subject areas

    • Physiology
    • Biochemistry
    • Insect Science


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