Zinc Ions Block the Intracellular Calcium Release Induced by Caffeine in Guinea-pig Taenia Caeci
Overview
Authors
Affiliations
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.
Calcium's Role and Signaling in Aging Muscle, Cellular Senescence, and Mineral Interactions.
Terrell K, Choi S, Choi S Int J Mol Sci. 2023; 24(23).
PMID: 38069357 PMC: 10706910. DOI: 10.3390/ijms242317034.
Xia R, Cheng X, Wang H, Chen K, Wei Q, Zhang X Biochem J. 2000; 345 Pt 2:279-86.
PMID: 10620505 PMC: 1220757.