PMID: 45041May 1, 1979

Is a slow reacting substance-like compound involved in rat platelet agglutination

Prostaglandins and Medicine
C MeringoloO Barnabei

Abstract

Endoperoxide analogs at doses 100-fold higher than those required to aggregate human platelet-rich plasma (PRP), were ineffective on rat PRP. Indomethacin (20 microM) and imidazole did not affect arachidonate-induced aggregation of rat PRP. On the other hand, prostaglandin (PG) E1 inhibited aggregation at doses similar to those effective on human PRP, while high doses of PGI2 failed to inhibit arachidonate aggregation in the rat. Eicosatetraynoic acid (10 microgram) blocked the second phase of aggregation; the Ca2+-ionophore A 23187 potentiated the arachidonate effect. Thus, it appears that endoperoxides or thromboxane A2 may not be involved in rat platelet aggregation and that the formation of aggregants from arachidonate shares many properties with the biosynthesis of slow reacting substance, a metabolite of arachidonic acid containing a sulphate group. To test this, rat PRP was incubated with labeled sulphate and aggregated with arachidonate. After column and thin layer chromatography a labeled lipid was identified having a mobility higher than phospholipids but lower than PGF2 alpha. Treatment with arylsulphatase decreased radioactivity by at least 70%.

Citations

Oct 15, 1976·FEBS Letters·E FerrettiV Tomasi
Feb 1, 1978·Proceedings of the National Academy of Sciences of the United States of America·E G LapetinaP Cuatrecasas
Jan 1, 1977·Prostaglandins·F F SunJ C McGuire
Apr 1, 1978·Prostaglandins·J E Vincent, F J Zijlstra
Aug 1, 1975·Proceedings of the National Academy of Sciences of the United States of America·M HambergB Samuelsson
Feb 23, 1976·Biochimica Et Biophysica Acta·T K BillsM J Silver
Sep 1, 1974·Proceedings of the National Academy of Sciences of the United States of America·M Hamberg, B Samuelsson

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Pulmonary Fibrosis
Prostaglandin Endoperoxides
Platelet Aggregation
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Eicosatetraenoic Acids
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Autacoids

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