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PMID: 6961445 Published · ppublish English Journal Article

Cytochalasins inhibit arachidonic acid metabolism in thrombin-stimulated platelets.

Siess W, Lapetina EG, Cuatrecasas P

Abstract

Low concentrations (0.5-1 microM) of cytochalasins inhibit the thrombin-stimulated polymerization of monomeric actin to filamentous actin in platelets. Similar concentrations of cytochalasin B inhibit the formation and metabolism of arachidonic acid in horse platelets stimulated by low concentrations of thrombin (0.1-0.5 unit/ml). However, the release of serotonin is not inhibited by cytochalasin B. Cytochalasins B and D (0.5-1 microM) markedly reduce, in thrombin-stimulated human or horse platelets, the metabolism of the liberated arachidonic acid by cyclooxygenase activity to thromboxane B2 and 12-hydroxy-5,8,10-heptadecatrienoic acid and the conversion of arachidonic acid by lipoxygenase activity to 12-hydroxy-5,8,10,14-icosatetraenoic acid. The generation of arachidonic acid from platelet phospholipids and the formation of phosphatidic acid are much less affected by cytochalasin B or D. Cytochalasins do not directly inhibit platelet cyclooxygenase, lipoxygenase, phospholipase A2, or phosphatidyl-inositol-specific phospholipase C. In addition, the metabolism of exogenously added arachidonic acid by intact platelets is not inhibited by cytochalasins B and D. The results indicate that polymerization of actin in platelets stimulated by thrombin may be required for the effective metabolism of arachidonic acid released from platelet phospholipids.

MeSH Terms
Actins/metabolism Animals Arachidonic Acids/metabolism Blood Platelets/drug effects,metabolism Cytochalasins/pharmacology Cytoskeleton/drug effects Horses Phospholipases/metabolism Thrombin/metabolism
Chemicals
Actins Arachidonic Acids Cytochalasins Phospholipases Thrombin
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Siess W
Lapetina E G
Cuatrecasas P
References (30)
30 references, click to expand
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
Published
1982-12-00
Pages
7709-13
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC347417
Subset
IM
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