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Zinc Ions Block the Intracellular Calcium Release Induced by Caffeine in Guinea-pig Taenia Caeci

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Journal Experientia
Specialty Science
Date 1995 Feb 15
PMID 7875248
Citations 2
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Abstract

Zn2+ in low concentrations (0.005-0.1 mM) inhibited the transient contractions in response to caffeine (25 mM) in a dose-dependent manner in smooth muscle of intact guinea-pig taenia caeci. At Zn2+ concentrations higher than 0.1 mM, caffeine did not elicit any response. After saponin-treatment of the fibres, which leaves the Ca2+ storage sites intact, caffeine contraction was completely inhibited by Zn2+ at a relatively low concentration (0.003 mM). However, in Triton-X-100-treated fibres, in which the Ca2+ release sites are destroyed, the contraction could be induced in the presence of Zn2+ by an increase in Ca2+. In conclusion, Zn2+ can block the intracellular Ca2+ release from caffeine-sensitive release sites in taenia caeci.

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