Prostaglandin A1 inhibits increases in intracellular calcium concentration, TXA(2) production and platelet activation

  • Acta Pharmacol Sin. 2006 May;27(5):549-54. doi: 10.1111/j.1745-7254.2006.00311.x.
Yi Zhu  1 ,  Zhen-Lun Gu ,  Zhong-Qin Liang ,  Hui-Lin Zhang ,  Zheng-Hong Qin
Affiliations
  • 1. Department of Pharmacology, Soochow University School of Medicine, Suzhou 215123, China.
PMID: 16626509 DOI: 10.1111/j.1745-7254.2006.00311.x
Abstract

Aim: In our previous studies we found that cyclopentenane prostaglandin A1 (PGA1) had neuroprotective effects in a rodent ischemic model. In the present study we aimed to investigate the inhibitory effect of PGA1 on platelet function.

Method: The rate of aggregation of human platelets was measured by using turbidimetry. The rate of adhesion of platelets to cultured endothelial cells was determined by using [(3)H]-adenine labeled platelets. 5-Hydroxytryptamine release from platelets was measured with O-phthaldialdehyde fluorospectrophotometry. The levels of TXB(2), a stable metabolite of TXA(2), were determined by radioimmuno-assay. Alternations in platelet morphology were observed using an electron microscope, and the intraplatelet free calcium concentrations were measured with Fluo-3/AM FCM assay.

Results: PGA1 significantly inhibited thrombin-, collagen- and ADP-induced aggregation and adhesion of platelets. The morphological changes of platelets induced by Thrombin were blocked by PGA1. PGA1 inhibited the release of 5-hydroxytyptamine from dense granules and the synthesis of TXA(2).

Conclusion: PGA1 inhibits the activation of platelets probably through blocking increases in intracellular calcium concentration and TXA(2) synthesis.

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