PMID: 6403041Mar 22, 1983Paper

Bradykinin-induced release of prostacyclin and thromboxanes from bovine pulmonary artery endothelial cells. Studies with lower homologs and calcium antagonists

Biochimica Et Biophysica Acta
D J CrutchleyG H Fisher

Abstract

Bovine pulmonary artery endothelial cells, in serum-free culture medium, release small quantities of prostacyclin and thromboxane A2 (3-10 and 0.1-0.3 ng/ml; measured as immunoreactive 6-ketoprostaglandin F1 alpha and thromboxane B2, respectively). The release of these substances is stimulated by up to 20-fold during a 3 min incubation with the vasodilator, bradykinin (Arg1-Pro2-Pro3-Gly4-Phe5-Ser6-Pro7-Phe8-Arg9). Endothelial cells incubated with [3H]arachidonic acid for 24 h and then exposed to bradykinin for 3 min release 3H into the medium, approximately 65% of which co-chromatographs with 6-ketoprostaglandin F1 alpha and 3% with thromboxane B2. The effects of bradykinin are dose-related and are often discernible when the hormone is used at concentrations believed to occur physiologically (10 pg/ml; approximately 10 pM). Furthermore, the bradykinin molecule must be intact: none of its lower homologs affects the release of prostacyclin, thromboxane A2, or 3H unless used at concentrations (1 microM or higher) unlikely to be achieved in vivo. The release appears to involve calcium uptake and calmodulin: it is abolished by EGTA (5 mM) and inhibited by the 'slow channel' calcium antagonists, verapamil and nifedipine (10-100 micr...Continue Reading

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