Comparative studies on the induction of muscle contracture in mouse diaphragm and Ca2+ release from sarcoplasmic reticulum vesicles by organotin compounds

Jaw Jou Kang, Shing Hwa Liu, I. Ling Chen, Yu Wen Cheng, Shoei Yn Lin-Shiau

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Effects of organotins, including triethyltin and tributyltin, on skeletal muscle were studied with diaphragm and isolated sarcoplasmic reticulum membrane vesicles. Triethyltin induced muscle contracture in mouse diaphragm while tributyltin had comparatively less potency and efficacy in inducing the muscle contracture. The contracture induced by tributyltin was inhibited when the diaphragm was pretreated with low Ca2+ medium or caffeine while the contracture induced by triethyltin persisted in the Ca2+-free medium but was inhibited by pretreatment of caffeine. Pretreatment of dithiothreitol blocked the contracture induced by tributyltin but not that by triethyltin. Triethyltin dose-dependently induced Ca2+ release from sarcoplasmic reticulum vesicles and inhibited the Ca2+-ATPase activity. These results suggested that triethyltin induced contracture in mouse diaphragm was mainly by induction of Ca2+ release and inhibition of Ca2+ uptake of the internal Ca2+ storage site the sarcoplasmic reticulum, while the tributyltin induced contracture might be due to enhancement of extracellular Ca2+ influx which further induce the release of internal Ca2+ through the Ca2+induced Ca2+ release mechanism.

Original languageEnglish
Pages (from-to)23-27
Number of pages5
JournalPharmacology and Toxicology
Volume82
Issue number1
Publication statusPublished - 1998
Externally publishedYes

ASJC Scopus subject areas

  • Pharmacology
  • Toxicology
  • Health, Toxicology and Mutagenesis

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