Blayney, Lynda Mary, Gapper, Peter William James and Newby, A. C. 1992. Vasoconstrictor agonists activate G-protein-dependent receptor-operated calcium channels in pig aortic microsomes. Biochemical Journal 282 (1) , pp. 81-84. |
Abstract
Receptor-operated Ca2+ channels were characterized by their ability to decrease steady-state ATP-dependent Ca2+ accumulation into pig aortic microsomes. The vasoconstrictor agents noradrenaline, angiotensin II and adenosine 5'-[alpha beta-methylene]triphosphate (pp[CH2]pA) all decreased Ca2+ accumulation only when sonicated into vesicles (to allow access to receptor sites) and in the presence of guanosine 5'-[beta gamma-imido]triphosphate to activate transducing G-proteins. The effect of noradrenaline was inhibited by the alpha 2 antagonist yohimbine, but not by the alpha 1 antagonist prazosin. The effect of none of the agonists was reversed by diltiazem. SK&F 96365 (an inhibitor of receptor-mediated Ca2+ influx into intact cells) reversed the effect of noradrenaline, but not that of pp[CH2]pA, which suggests that at least two receptor-operated channels may be present in this preparation.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Medicine |
Subjects: | R Medicine > R Medicine (General) |
Publisher: | Portland Press |
ISSN: | 0264-6021 |
Related URLs: | |
Last Modified: | 31 Jan 2020 04:19 |
URI: | https://orca.cardiff.ac.uk/id/eprint/65326 |
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