Fluorescein-methotrexate transport in brush border membrane vesicles from rat small intestine.

Fluorescein-methotrexate transport in brush border membrane vesicles from rat small intestine.
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荧光素-甲氨蝶呤在大鼠小肠刷状缘膜囊泡中的转运。

DOI:
10.1016/s0024-3205(03)00616-7
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发表时间:
2003
期刊:
影响因子:
6.1
通讯作者:
T. Horie
T. Horie
中科院分区:
医学2区
文献类型:
--
作者:
Tiesong Li;T. Tomimatsu;Kousei Ito;T. Horie

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研究了荧光素-甲氨蝶呤(F-MTX)在大鼠小肠刷状缘膜囊泡(BBMVs)中的转运特性。通过快速过滤技术测量BBMV中的F-MTX摄取。我们的研究结果表明:1)在向外定向的OH−梯度或向内定向的H+梯度的实验条件下,F-MTX向囊泡中的摄取显著增加,2)对温度敏感,3)随着孵育缓冲液pH值的降低而增加,4)在摄取的早期阶段被4,4 ′-二异硫氰基二苯乙烯-2,2 ′-二磺酸(DIDS)显著抑制,甲氨蝶呤(MTX)可明显抑制该作用。因此,BBMV中F-MTX的转运部分由还原叶酸转运蛋白(RFC)介导,已知RFC可通过小肠上皮转运MTX。
The transport characteristics of fluorescein-methotrexate (F-MTX) in isolated brush border membrane vesicles (BBMVs) from rat small intestine were studied. F-MTX uptake in BBMVs was measured by a rapid filtration technique. Our results demonstrated that F-MTX uptake into vesicles was 1) significantly increased under the experimental conditions of an outwardly directed OH−gradient or an inwardly directed H+gradient, 2) sensitive to temperature, 3) increased with decreasing pH of the incubation buffer, 4) significantly inhibited by 4,4′-diisothiocyanostilbene-2,2′-disulfonic acid (DIDS) at the early stage of the uptake, and 5) significantly inhibited by methotrexate (MTX). Thus, the transport of F-MTX in BBMVs was shown to be mediated in part by the reduced folate transporter (RFC) which was known to transport MTX through the epithelium of small intestine.
DOI: 10.1016/s0006-2952(96)00730-7
发表时间: 1997
影响因子: 5.8
作者:
Sierra,EE;Brigle,KE;Spinella,MJ;Goldman,ID
通讯作者: Goldman,ID
DOI: --
发表时间: 1999-04
影响因子: 4
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DOI: 10.1016/0065-2571(89)90059-9
发表时间: 1989
期刊: Advances in enzyme regulation
影响因子: --
作者:
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通过荧光素甲氨蝶呤共价标记观察叶酸转运蛋白。
DOI: 10.1016/0065-2571(90)90005-m
发表时间: 1990
期刊: Advances in enzyme regulation
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作者:
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通讯作者: Huennekens,FM
DOI: 10.1126/science.283.5404.990
发表时间: 1999-02-12
期刊: SCIENCE
影响因子: 56.9
作者:
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通讯作者: Michnick, SW