The regulation of platelet-activating factor production in endothelial cells. The role of calcium and protein kinase C.

Endothelial cells (EC) synthesize platelet-activating factor (PAF) when stimulated with agonists that bind to cell-surface receptors. We examined events that link receptor binding to synthesis of PAF by EC. Bovine EC stimulated with agonists that interact with specific cell-surface receptors accumulated PAF only in the presence of extracellular calcium. Hormonal stimulation of EC resulted in Ca2+ entry characteristic of that seen with receptor-operated calcium channels; Indo-1 measurements demonstrated that this inward flux of Ca2+ caused prolonged elevated levels of intracellular Ca2+. EC were exposed to melittin or theta toxin from Clostridium perfringens (pore-forming peptides that increase the permeability of the plasma membrane for small molecules) resulting in an inward flux of Ca2+ and accumulation of PAF. Ca2+ appears to be regulatory for PAF production at the level of phospholipase A2-mediated production of the PAF precursor 1-O-alkyl-2-lyso-sn-glycero-3-phosphocholine, as Ca2+ was required for the stimulated hydrolysis of 1-O-alkyl-2-acyl-sn-glycero-3-phosphocholine. PAF accumulation in EC is also regulated by protein kinase C. Pretreatment of EC with phorbol esters that activate protein kinase C or with dioctanoylglycerol, followed by stimulation, resulted in a 2-fold increase in stimulated PAF production. The regulatory effect of protein kinase C also appears to be at a phospholipase A2-mediated hydrolysis of 1-O-alkyl-2-acyl-sn-glycero-3-phosphocholine.

• Publication year

  1989

• Venue

  Journal of Biological Chemistry

• Publication date

  1989-04-15

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1016/s0021-9258(18)83351-8PMID 2703492
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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