Schwartz I L, Shlatz L J, Kinne-Saffran E, Kinne R
Proc Natl Acad Sci U S A. 1974 Jul;71(7):2595-9. doi: 10.1073/pnas.71.7.2595.
The plasma membrane of the bovine renal collecting duct epithelial cell has been resolved into its apical (luminal) and basal-lateral (contraluminal) components by free flow electrophoresis. The contraluminal, but not the luminal, membrane was found to contain antidiuretic hormone-sensitive adenylate cyclase. The luminal membrane was found to contain a cyclic 3':5'-adenosine monophosphate-sensitive self-phosphorylating system consisting of a membrane-bound protein kinase and its membrane-bound substrate(s); this intrinsic protein kinase was not present in the contraluminal membrane. These findings provide direct evidence that the initiating steps in the action of antidiuretic hormone on the kidney take place at the contraluminal pole of the hormonesensitive target cell and that the late or terminal steps occur at the luminal pole, where they involve an alteration in the level of membrane phosphorylation.
通过自由流动电泳,牛肾集合管上皮细胞的质膜已被分离为其顶端(管腔)和基底外侧(对管腔)成分。发现对管腔侧而非管腔侧的膜含有抗利尿激素敏感的腺苷酸环化酶。发现管腔侧膜含有一个由膜结合蛋白激酶及其膜结合底物组成的环3':5'-腺苷单磷酸敏感的自磷酸化系统;这种内在蛋白激酶不存在于对管腔侧膜中。这些发现提供了直接证据,表明抗利尿激素对肾脏作用的起始步骤发生在激素敏感靶细胞的对管腔极,而后期或终末步骤发生在管腔极,在那里它们涉及膜磷酸化水平的改变。