当前位置： SCI文献检索 > LIFE SCIENCES期刊下所有文献 > A comparative study of the affinities of some tricyclic antidepressants for the muscarinic cholinergic receptor in human and guinea-pig bladder, ileum and brain in relation to differential drug potency.

A comparative study of the affinities of some tricyclic antidepressants for the muscarinic cholinergic receptor in human and guinea-pig bladder, ileum and brain in relation to differential drug potency.

Abstract：

:Following a report that nortriptyline was found useful in the control of enuresis in adults, presumably as an anticholinergic, its likely mechanism of action and apparent bladder specificity have now been investigated in vitro. The ratios of anticholinergic potencies (reciprocal of dissociation contents, Ki) for four different tricyclic antidepressants, derived from competitive binding assays with (-)[3H]QNB in tissue homogenates, in the order (human) detrusor muscle/ileal longitudinal muscle/caudate, are as follows: Nortriptyline, 5/4/7; desipramine, 2/1/5/; clomipramine, 4/3/27; amitriptyline, 25/14/56. The apparent selective effect of nortriptyline on the bladder cannot be ascribed to its higher affinity to bladder receptors. Still, this drug is the least discriminatory of the four. Hence, at a given concentration, it is expected to affect tissue embodying a low density receptor pool sooner than tissue having a large receptor reserve. The ratios of the densities of (-)[3H]QNB binding sites in the order detrusor muscle/ileal muscle/cortex is 1/3/5, supporting the present contention. In the guinea-pig, the ratios of the anticholinergic potency in the order bladder/proximal ileum/distal ileum/cortex are as follows: Nortriptyline, 25/5/6/33; desipramine, 8/2/2/14; amitriptyline, 100/14/20/100; clomipramine, 17/3/5/33. Also, the ratios of the densities of binding sites are 1/6/5/2. Hence, data derived from assays in the guinea-pig are not representative of those derived from human tissue.

journal_name

Life Sci

journal_title

Life sciences

authors

Rehavi M,Weiss H,Nissenkorn I,Rubinstein R,Cohen S

doi

10.1016/0024-3205(87)90093-2

subject

Has Abstract

pub_date

1987-05-04 00:00:00

pages

1819-27

issue

18

eissn

0024-3205

issn

1879-0631

pii

0024-3205(87)90093-2

journal_volume

40

pub_type

杂志文章

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