Demonstration of adenylate cyclase coupled adenosine receptors in guinea pig ventricular membranes.

Abstract:

:Adenylate cyclase in homogenates of guinea pig ventricles was inhibited by the stable adenosine analogs N6-phenylisopropyladenosine (PIA) and 5(1)-N-ethylcarboxamidoadenosine (NECA). Inhibition required GTP and was enhanced by sodium ion. The maximum inhibition observed was 35.1 +/- 1.1%, the EC50 (95% confidence limits, n) for PIA and NECA were 0.20 microM (0.17-0.25 microM, 6) and 0.66 microM (0.26-1.7 microM, 4) respectively. 8-Phenyltheophylline (10 and 100 microM) and isobutylemethylxanthine (100 microM) antagonized the inhibitory effects of the adenosine analogs. These results indicate that adenosine receptors of the inhibitory type (RI or A1) are present in guinea pig myocardium and may mediate some of the cardiac responses to adenosine.

authors

Leung E,Johnston CI,Woodcock EA

doi

10.1016/0006-291x(83)91281-0

subject

Has Abstract

pub_date

1983-01-14 00:00:00

pages

208-15

issue

1

eissn

0006-291X

issn

1090-2104

pii

0006-291X(83)91281-0

journal_volume

110

pub_type

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