Hydrogen ion cotransport by the renal brush border glutamate transporter.

Hydrogen ion cotransport by the renal brush border glutamate transporter.
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氢离子通过肾刷状缘谷氨酸转运蛋白协同转运。

DOI:
10.1021/bi00292a030
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发表时间:
1983
期刊:
影响因子:
2.9
通讯作者:
Rudnick,G
Rudnick,G
中科院分区:
生物学3区
文献类型:
--
作者:
Nelson,PJ;Dean,GE;Aronson,PS;Rudnick,G

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纳尔逊,加里E.作者:Peter S. Aronson和加里Rudnick* 摘要:钠离子依赖性谷氨酸转运进入兔肾刷状缘膜囊泡受到低外部pH的刺激,并受到低内部pH的抑制。在没有其他驱动力的情况下,跨囊泡膜施加pH差()(内部碱性)驱动谷氨酸蓄积。这一过程需要Na+,但不是由于响应于Na+而产生Na+梯度。内源性K+刺激谷氨酸受体的速率和程度,二羧酸氨基酸谷氨酸是肾脏和大脑中特异性转运系统的底物。在脑中,谷氨酸作为神经递质的作用被认为通过快速和有效地再摄取到突触前神经末梢中而终止(Curtis等人,1960年)。脑切片和突触体通过高亲和力过程积累谷氨酸(Navon & Lathja,1969; Balear &约翰逊,1972; Logan & Snyder,1972;惠勒& Hollingsworth,1978),该过程也已在培养的小脑细胞中研究(Stallcup等,1979)和分离的突触质膜囊泡(Kanner & Sharon,1978; Kanner & Marva,1982)。在肾脏中,谷氨酸(与其他氨基酸一样)在近曲小管中自由过滤和广泛重吸收(Weber,1962)。谷氨酸被快速转运到完整的近曲小管上皮细胞中(Siebernagl等人,1975年;萨马尔齐亚和
Pamlea J. Nelson, Gary E. Dean, Peter S. Aronson, and Gary Rudnick* abstract: Sodium ion dependent glutamate transport into rabbit renal brush border membranevesicles is stimulated by low external pH and inhibited by low internal pH. Imposition of a pH difference ()(interior alkaline) across the vesicle membrane drives glutamate accumulation in the absence of other driving forces. This process requires Na+ but is not due to generation of an Na+ gradient in response to. Internal K+ stimulates both the rate and extent of glutamate accue dicarboxylic amino acid glutamate is the substrate for specific transport systems in kidney and brain. In brain, the action of glutamate as a neurotransmitter is believed to be terminated by rapid and efficient reuptake into presynaptic nerve terminals (Curtis et al., 1960). Brain slices and sy-naptosomes accumulateglutamate by a high-affinity process (Navon & Lathja, 1969; Balear & Johnson, 1972; Logan & Snyder, 1972; Wheeler & Hollingsworth, 1978) that has also been studied in cultured cerebellarcells (Stallcup et al., 1979) and in isolated synaptic plasma membrane vesicles (Kanner & Sharon, 1978; Kanner & Marva, 1982). In the kidney, glutamate (like other amino acids) is freely filtered and ex-tensively reabsorbed in the proximal convoluted tubule (Weber, 1962). Glutamate is rapidly transported into intact proximal tubule epithelial cells (Siebernagl et al., 1975; Samarzija &
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