The interaction of verapamil and norverapamil with beta-adrenergic receptors.
The interaction of verapamil and norverapamil with beta-adrenergic receptors.
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维拉帕米和去甲维拉帕米与β-肾上腺素能受体的相互作用。
DOI:
10.1161/01.cir.72.3.547
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发表时间:
1985
期刊:
影响因子:
37.8
通讯作者:
Lai,CY
中科院分区:
文献类型:
--
作者:
Feldman,RD;Park,GD;Lai,CY
To determine the effect of calcium-channel blockers on beta-adrenergic receptors, we studied the interactions of verapamil, diltiazem, and nifedipine with both human lymphocyte beta 2-adrenergic receptors and rat myocardial beta 1-adrenergic receptors by means of radioligand binding assays. We also determined the functional consequences of these interactions by measuring adenylate cyclase activity. Radioligand binding studies in vitro demonstrated a Ki of verapamil for the lymphocyte beta 2-receptor of 32 +/- 4 microM. Diltiazem and nifedipine were much less potent. In studies of adenylate cyclase activity, verapamil was shown to act as a competitive beta-receptor antagonist. Also, norverapamil, the active metabolite of verapamil, had the highest affinity for the beta-receptor of any of the calcium-channel blockers studied (Ki = 4.2 +/- 0.8 microM). After 1 week of verapamil administration in six normal subjects, isoproterenol-stimulated adenylate cyclase activity in lymphocytes was increased from 60 +/- 4% to 83 +/- 10% over basal activity (p less than .05). This was associated with an increase in lymphocyte beta-receptor affinity for agonist as represented by the decrease in the IC50 for isoproterenol inhibition of [125I] iodocyanopindolol binding from 240 +/- 20 to 170 +/- 10 nM (p less than .05). Additionally, plasma norepinephrine levels were reduced from 206 +/- 58 to 92 +/- 18 pg/ml with 1 week of verapamil treatment (p less than .05). Our data suggest that verapamil affects lymphocyte beta-receptors in vitro and with long-term administration regulates lymphocyte beta-receptor function either directly or indirectly via a reduction in plasma catecholamine levels.
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影响因子:
3
作者:
Karliner,JS;Motulsky,HJ;Dunlap,J;Brown,JH;Insel,PA
通讯作者:
Insel,PA
DOI:
10.1016/s0140-6736(83)90855-3
发表时间:
1983
期刊:
The Lancet
影响因子:
--
作者:
D. Lima;P. Turner
通讯作者:
P. Turner
影响因子:
20.1
作者:
Motulsky,HJ;Snavely,MD;Hughes,RJ;Insel,PA
通讯作者:
Insel,PA
影响因子:
37.8
作者:
M. Olivari;C. Bartorelli;A. Polese;C. Fiorentini;P. Moruzzi;M. Guazzi
通讯作者:
M. Guazzi
影响因子:
1.9
作者:
A. O. Davies;R. Lefkowitz
通讯作者:
R. Lefkowitz