Role of carbohydrate in human chorionic gonadotropin: deglycosylation uncouples hormone-receptor complex and adenylate cyclase system.

Role of carbohydrate in human chorionic gonadotropin: deglycosylation uncouples hormone-receptor complex and adenylate cyclase system.
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碳水化合物在人绒毛膜促性腺激素中的作用:去糖基化使激素受体复合物和腺苷酸环化酶系统解偶联。

DOI:
10.1016/0006-291x(82)91880-0
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发表时间:
1982
影响因子:
3.1
通讯作者:
Bahl,OP
Bahl,OP
中科院分区:
生物学4区
文献类型:
--
作者:
Thotakura,NR;Bahl,OP

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以往的工作表明,人绒毛膜促性腺激素(HCG)的脱糖不影响其受体结合特性,但其刺激卵巢细胞内循环AMP积聚和类固醇合成的能力被取消。为了确定hCG的碳水化合物参与激素作用机制的部位,我们研究了脱糖和天然hCG对卵巢膜制剂中腺苷环化酶活性的影响。去糖化的hCG不能刺激卵巢膜的腺苷环化酶,也能抑制hCG的作用。数据显示,hCG受体和儿茶酚胺受体都偶联到同一个腺苷环化酶复合体上。由于在脱糖hCG存在的情况下,腺苷环化酶活性仍然对儿茶酚胺反应最大,这表明腺苷环化酶复合体是有功能的,不受脱糖hCG与其受体的相互作用的影响。脱糖hCG不会损害鸟嘌呤核苷酸对腺苷环化酶的最大刺激,这一事实进一步支持了这一点。因此,hCG的碳水化合物的作用部位先于激素受体复合体和腺苷环化酶系统的偶联。
Previous work has shown that deglycosylation of human chorionic gonadotropin (hCG) does not affect its receptor binding characteristics, but its ability to stimulate intracellular cyclic AMP accumulation and steroidogenesis in ovarian cells is abolished. To identify the site at which carbohydrate of hCG is involved in the mechanism of action of the hormone, we have studied adenylate cyclase activity in ovarian membrane preparations in response to deglycosylated and native hCG. The deglycosylated hCG does not stimulate adenylate cyclase of ovarian membrane preparation and also it acts as an inhibitor of hCG action. Data are presented to show that both hCG- and catecholamine receptors are coupled to the same adenylate cyclase complex. Since adenylate cyclase activity in the presence of deglycosylated hCG remains still responsive maximally to catecholamines, it indicates that the adenylate cyclase complex is functional and is unaffected by the interaction of deglycosylated hCG to its receptor. This is further supported by the fact that the deglycosylated hCG does not impair the maximal stimulation of adenylate cyclase by guanine nucleotides. Thus, the site of action of the carbohydrate of hCG is prior to the coupling of the hormone-receptor complex and the adenylate cyclase system.
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