Electrophysiology of succinate transport across rabbit renal brush border membranes.

Electrophysiology of succinate transport across rabbit renal brush border membranes.
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琥珀酸跨兔肾刷状缘膜转运的电生理学。

DOI:
10.1113/jphysiol.1985.sp015605
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发表时间:
1985
期刊:
The Journal of physiology
影响因子:
--
通讯作者:
Wright,EM
Wright,EM
中科院分区:
--
文献类型:
--
作者:
Schell,RE;Wright,EM

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在兔肾刷状缘膜囊泡中,使用电压敏感光学探针(diS-C3-(5))监测膜电位。在一价阴离子以及一价、二价和三价阳离子存在的情况下,测定了产电Na+/琥珀酸共转运蛋白的离子依赖性。Na+和La 3+是能够支持琥珀酸依赖性膜去极化的唯一阳离子:Li+、K+、Rb+、Cs+、NH 4+、Hg 2+、Ca 2+、Ba 2+、Sr 2+、Mg 2+、Cu 2+、Fe 2+、Cd 2+、Be 2+、Pb 2+、Zn 2+、Mn 2+和Co2+不能。琥珀酸盐以可饱和的方式增加了刷状缘膜的Na+渗透性:饱和琥珀酸盐(3 mM)浓度将Na+/K+渗透性(PNa/PK)比从0.6增加到2.3。在Na+存在的情况下,Li+和Hg 2+抑制琥珀酸电位:cis-Li+抑制是竞争性的,表观Ki为2 mM,而trans-Li+是非竞争性的; cis-Hg 2+降低最大去极化,抑制剂常数Ki为8 μ M,这种效应是不可逆的。没有影响的阳离子包括K+、Rb+、Cs+、NH 4+、Ba 2+、Ca 2+、Mg 2+、Sr 2+、Cu 2+、Fe 2+、Cd 2+、Co 2+、Be 2+、Zn 2+、Pb 2+、Mn 2+和La 3+。可以得出结论,琥珀酸/Na+共转运产生了肾刷状缘Na+电导的特异性增加。
In rabbit renal brush border membrane vesicles, the membrane potential was monitored using a voltage‐sensitive optical probe (diS‐C3‐(5)). The ionic dependence of the electrogenic Na+/succinate co‐transporter was determined in the presence of monovalent anions and mono‐, di‐, and trivalent cations. Na+ and La3+ were the only cations capable of supporting a succinate‐dependent membrane depolarization: Li+, K+, Rb+, Cs+, NH4+, Hg2+, Ca2+, Ba2+, Sr2+, Mg2+, Cu2+, Fe2+, Cd2+, Be2+, Pb2+, Zn2+, Mn2+ and Co2+ did not. Succinate increased the Na+ permeability of the brush border membrane in a saturable manner: saturating succinate (3 mM) concentrations increased the Na+/K+ permeability (PNa/PK) ratio from 0.6 to 2.3. In the presence of Na+, Li+ and Hg2+ inhibit the succinate potential: cis‐Li+ inhibition is competitive with an apparent Ki of 2 mM, while trans‐Li+ is noncompetitive; cis‐Hg2+ decreased the maximal depolarization with an inhibitor constant Ki of 8 microM, and this effect was irreversible. Cations having no effect included K+, Rb+, Cs+, NH4+, Ba2+, Ca2+, Mg2+, Sr2+, Cu2+, Fe2+, Cd2+, Co2+, Be2+, Zn2+, Pb2+, Mn2+, and La3+. It is concluded that succinate/Na+ co‐transport produces a specific increase in the Na+ conductance of renal brush borders.
兔肾皮质基底外侧和腔膜囊泡对柠檬酸盐的摄取。
DOI: --
发表时间: 1983
影响因子: --
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通讯作者: M. Sheikh
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影响因子: 4.1
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琥珀酸钠跨肾刷状缘膜共转运的动力学。
DOI: --
发表时间: 1983
期刊: The Journal of biological chemistry
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DOI: 10.1073/pnas.79.23.7514
发表时间: 1982
影响因子: 11.1
作者:
Wright,EM;Wright,SH;Hirayama,B;Kippen,I
通讯作者: Kippen,I
DOI: 10.1152/ajprenal.1984.246.4.f363
发表时间: 1984
期刊: The American journal of physiology
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