The function of Gp170, the multidrug-resistance gene product, in the brush border of rat intestinal mucosa.

The function of Gp170, the multidrug-resistance gene product, in the brush border of rat intestinal mucosa.
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多重耐药基因产物Gp170在大鼠肠粘膜刷状缘中的功能。

DOI:
10.1016/0016-5085(92)90173-v
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发表时间:
1992
期刊:
影响因子:
29.4
通讯作者:
Arias,IM
Arias,IM
中科院分区:
医学1区
文献类型:
--
作者:
Hsing,S;Gatmaitan,Z;Arias,IM

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Gp170是一种跨膜糖蛋白,在多药耐药肿瘤细胞中过表达,存在于小肠粘膜细胞的顶质膜结构域。研究了Gp170在大鼠小肠中的功能。空肠和回肠刷状边界膜泡,而不是基底侧膜泡,显示了Gp170底物daunomycin的三磷酸腺苷(ATP)依赖性转运,daunomycin含有约170千道顿的蛋白,可与抗Gp170单克隆抗体反应。而ATP支持道诺霉素运输,非水解ATP类似物是无效的。atp依赖的道诺霉素通过刷状边界囊泡的转运是单向的(由内到外)和温度依赖的,并被Gp170抑制剂阻断,但不被牛磺胆酸盐或溴磺胺谷胱甘肽阻断。利用小肠外翻的研究揭示了Gp170底物罗丹明123从浆膜表面通过粘膜的运输和Gp170抑制剂的抑制作用。这些结果表明,大鼠小肠刷状边界膜泡中的Gp170是一个atp依赖的外排泵,负责将Gp170底物转运到小肠腔中。Gp170可能对外源性的潜在破坏性疏水阳离子具有保护作用,并有助于人类和许多动物的小肠癌的罕见性。
Gp170 is a transmembrane glycoprotein that is overexpressed in multidrug-resistant tumor cells and is present in the apical plasma membrane domain of small intestinal mucosal cells. The function of Gp170 was studied in the small intestine of the rat. Jejunal and ileal brush border membrane vesicles, but not basolateral membrane vesicles, manifested adenosine triphosphate (ATP)-dependent transport of daunomycin, a substrate for Gp170, and contained a ~170-kilodalton protein that reacts with anti-Gp170 monoclonal antibody. Whereas ATP supported daunomycin transport, nonhydrolyzable ATP analogues were ineffective. ATP-dependent daunomycin transport by brush border vesicles was unidirectional (inside to outside) and temperature dependent and was blocked by Gp170 inhibitors but not by taurocholate or bromsulphalein glutathione. Studies using everted small intestine revealed transport of rhodamine 123, a Gp170 substrate, from the serosal surface through the mucosa and inhibition by Gp170 inhibitors. These results suggest that Gp170 in rat small intestinal brush border membrane vesicles is an ATP-dependent efflux pump responsible for the transport of Gp170 substrates into the small intestinal lumen. Gp170 may protect against exogenously derived potentially damaging hydrophobic cations and contribute to the rarity of small intestinal cancer in humans and many animals.
DOI: 10.1073/pnas.87.19.7777
发表时间: 1990-10-01
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冻融和高压放电使大分子摄取到回肠刷状缘囊泡中。
DOI: 10.1152/ajpgi.1987.252.6.g723
发表时间: 1987
期刊: The American journal of physiology
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发表时间: 1974-01-01
影响因子: 5.6
作者:
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通讯作者: THOMPSON, LH
使用 Mg/EGTA 通过沉淀法制备的大鼠小肠刷状缘膜囊泡的异质性。
DOI: --
发表时间: 1983
期刊: European Journal of Biochemistry
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发表时间: 1988
期刊: The Journal of biological chemistry
影响因子: --
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