Inhibition of Ca2+-activated tension and myosin light chain phosphorylation in skinned smooth muscle strips by the phenothiazines

P. Cassidy, P. E. Hoar, W. Glenn Kerrick

Research output: Contribution to journalArticle

26 Scopus citations


The antipsychotic phenothiazine drugs trifluoperazine, chlorpromazine, and promethazine inhibited Ca2+-activated tension in functionally skinned rabbit ileum and rabbit pulmonary artery strips. Exogenous calmodulin rapidly reversed the inhibition of tension. Inhibition of the endogenous myosin light chain kinase by these drugs resulted with ATP or its analog, ATPγS, as a substrate. The evidence presented suggests the inhibition of Ca2+ activation of tension in skinned smooth muscle preparations by phenothiazines is due to the inhibition of Ca2+-activated phosphorylation of the 20,000 dalton myosin light chain by the endogenous myosin light chain kinase.

Original languageEnglish
Pages (from-to)115-120
Number of pages6
JournalPflügers Archiv European Journal of Physiology
Issue number2
StatePublished - Sep 1 1980
Externally publishedYes



  • Calmodulin
  • CDR
  • Myosin light chain kinase
  • Phenothiazines
  • Smooth muscle

ASJC Scopus subject areas

  • Physiology

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