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. 1991 Oct;104(2):361–366. doi: 10.1111/j.1476-5381.1991.tb12436.x

Modulation of agonist-induced calcium mobilisation in bovine aortic endothelial cells by phorbol myristate acetate and cyclic AMP but not cyclic GMP.

K W Buchan 1, W Martin 1
PMCID: PMC1908532  PMID: 1665733

Abstract

1. In bovine aortic endothelial cells (BAEC), thrombin (1 mu ml-1), bradykinin (1-10 nM) and adenosine triphosphate (ATP) (0.3 microM-100 microM) each induced a biphasic elevation of cytosolic calcium ([Ca2+]i), consisting of an initial transient followed by a sustained plateau phase. 2. Pretreatment of BAEC with 4 beta-phorbol 12-myristate 13-acetate (PMA; 100 nM) reduced the magnitude of the initial transient elevation of [Ca2+]i, induced by thrombin (1 mu ml-1), low concentrations of bradykinin (1 nM) or ATP (0.3 microM, 3 microM), but not by higher concentrations of the latter two agonists. Addition of PMA (100 nM) during the plateau phase of the increase in [Ca2+]i induced by thrombin (1 mu ml-1), bradykinin (10 nM) or ATP (30 microM) resulted in a fall in [Ca2+]i. 3. The inhibitory effects of PMA (100 nM) were inhibited by staurosporine (100 nM) but not mimicked by the inactive phorbol ester, 4 alpha-phorbol 12,13-didecanoate (4 alpha-PDD; 100 nM). Furthermore, staurosporine (100 nM) increased [Ca2+]i when added during the plateau phase of the increase in [Ca2+]i induced by thrombin or bradykinin. In contrast, staurosporine (100 nM) reduced [Ca2+]i when added during the plateau phase of the increase in [Ca2+]i induced by ATP (30 microM). 4. Pretreatment with forskolin (10 microM) had no effect on the magnitude of the initial transient elevation of [Ca2+]i induced by thrombin (1 mu ml-1), bradykinin (1 nM and 10 nM) or ATP (30 microM).(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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