Regulation of phosphoinositide breakdown by guanine nucleotides

Irene Litosch, John N. Fain

Research output: Contribution to journalShort surveypeer-review

88 Scopus citations


Phosphoinositide hydrolysis is coupled to receptor systems involved in the elevation of cytosolic Ca2+ and activation of protein kinase C. In cell-free systems, guanine nucleotides are required to transduce the effects of receptor activation to phosphoinositide breakdown. Non-hydrolyzable guanine nucleotides stimulate phosphoinositide breakdown in permeabilized cells as well as membranes prepared from salivary glands, GH3 cells, neutrophils, hepatocytes and cerebral cortical tissue. In blowfly salivary gland membranes, 5-hydroxytryptamine stimulates a guanine-nucleotide dependent breakdown of both endogenous and exogenous phosphoinositide substrate through activation of phospholipase C. These data suggest that a GTP-binding protein modulates phospholipase C activity. The identity of this GTP-binding protein has not been established but may resemble other regulatory GTP-binding proteins which have been identified as transducing proteins in a variety of receptor systems.

Original languageEnglish (US)
Pages (from-to)187-194
Number of pages8
JournalLife Sciences
Issue number3
StatePublished - Jul 21 1986

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)


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