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血管活性肠肽与大鼠和兔肠上皮细胞基底外侧膜的优先结合。

Preferential binding of vasoactive intestinal polypeptide to basolateral membrane of rat and rabbit enterocytes.

作者信息

Dharmsathaphorn K, Harms V, Yamashiro D J, Hughes R J, Binder H J, Wright E M

出版信息

J Clin Invest. 1983 Jan;71(1):27-35. doi: 10.1172/jci110748.

Abstract

Binding of radioiodinated vasoactive intestinal polypeptide (VIP) to intestinal cell membranes of the rabbit ileum and rat jejunum was investigated. Specific binding of 125I-labeled VIP could be demonstrated only on the basolateral membrane and not on the brush border membrane. This corresponded with the lack of an effect on ion transport when VIP was applied to the mucosal side of an in vitro preparation of rabbit ileum. VIP altered ion transport only when it was applied to the serosal side. The binding of 125I-VIP was specific and dependent upon incubation temperature. There was a close correlation between the potency of VIP for inhibition of 125I-VIP binding and that for increasing adenylate cyclase activity. These observations demonstrate that VIP receptors are located on the basolateral membrane.

摘要

研究了放射性碘化血管活性肠肽(VIP)与兔回肠和大鼠空肠肠细胞膜的结合情况。仅在基底外侧膜上可证明125I标记的VIP有特异性结合,而在刷状缘膜上则没有。这与将VIP应用于兔回肠体外制剂的黏膜侧时对离子转运缺乏影响相一致。仅当将VIP应用于浆膜侧时,它才会改变离子转运。125I-VIP的结合是特异性的,且依赖于孵育温度。VIP抑制125I-VIP结合的效力与其增加腺苷酸环化酶活性的效力之间存在密切相关性。这些观察结果表明,VIP受体位于基底外侧膜上。

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