Sodium inward currents through calcium channels in mealworm muscle fibers

Daisuke Yamamoto

doi:10.1002/arch.940050402

Sodium inward currents through calcium channels in mealworm muscle fibers

Daisuke Yamamoto

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	227-231
Number of pages	5
Journal	Archives of Insect Biochemistry and Physiology
Volume	5
Issue number	4
DOIs	https://doi.org/10.1002/arch.940050402
Publication status	Published - 1987 Aug

Keywords

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

ASJC Scopus subject areas

Physiology
Biochemistry
Insect Science

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10.1002/arch.940050402

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title = "Sodium inward currents through calcium channels in mealworm muscle fibers",

abstract = "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+.",

keywords = "Ca channel, Na spike, ion selectivity, mealworm, muscle membrane, voltage‐clamp",

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year = "1987",

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journal = "Archives of Insect Biochemistry and Physiology",

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T1 - Sodium inward currents through calcium channels in mealworm muscle fibers

AU - Yamamoto, Daisuke

PY - 1987/8

Y1 - 1987/8

N2 - 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+.

AB - 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+.

KW - Ca channel

KW - Na spike

KW - ion selectivity

KW - mealworm

KW - muscle membrane

KW - voltage‐clamp

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DO - 10.1002/arch.940050402

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