High molecular weight peptide with corticotropin-releasing factor activity from porcine hypothalami.

High molecular weight peptide with corticotropin-releasing factor activity from porcine hypothalami.
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来自猪下丘脑的具有促肾上腺皮质激素释放因子活性的高分子量肽。

DOI:
10.1073/pnas.78.8.5197
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发表时间:
1981
影响因子:
11.1
通讯作者:
Vigh,S
Vigh,S
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Schally,AV;Chang,RC;Arimura,A;Redding,TW;Fishback,JB;Vigh,S

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通过在Sephadex G-25上然后在Sephadex G-50上进行凝胶过滤纯化猪下丘脑提取物后,确定了表现为分子量约5000的肽的促肾上腺皮质激素释放因子(CRF)的存在。纯化的 CRF 在三个体外系统中刺激促肾上腺皮质激素 (ACTH) 的释放:分离的大鼠垂体区、分散垂体细胞的单层培养物以及柱上灌注的垂体细胞。每毫升50至200微克的CRF制剂与灌注的垂体细胞释放的ACTH总量之间存在线性对数剂量反应关系。垂体区系统中垂体ACTH对CRF的反应也与CRF剂量的对数近似线性相关。 CRF 还刺激用氯丙嗪、吗啡和戊巴比妥预处理的大鼠体内 ACTH 的释放。 CRF 活性不易被胰蛋白酶和胰凝乳蛋白酶消化,并被胃蛋白酶部分破坏。证据表明猪源的CRF是一种分子量比之前假设的更高的多肽。
The presence of a corticotropin-releasing factor (CRF) behaving as a peptide with a molecular weight of about 5000 was established after purification of porcine hypothalamic extracts by gel filtration on Sephadex G-25 and then on Sephadex G-50. Purified CRF stimulated the release of corticotropin (ACTH) in three in vitro systems: isolated rat pituitary quarters, monolayer cultures of dispersed pituitary cells, and superfused pituitary cells on a column. A linear logarithmic dose-response relationship existed between 50 and 200 micrograms of CRF preparations per ml and the total amount of ACTH released by the superfused pituitary cells. The pituitary ACTH response to CRF in the pituitary quarters system was also approximately linearly related to the logarithm of the dose of CRF. CRF also stimulated in vivo release of ACTH in rats pretreated with chlorpromazine, morphine, and Nembutal. CRF activity was labile to digestion with trypsin and chymotrypsin and was partially destroyed by pepsin. The evidence indicates that CRF of porcine origin is a polypeptide of a higher molecular weight than previously assumed.
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