Na+ and H+ gradient-dependent transport of p-aminohippurate in membrane vesicles from dog kidney cortex.

Na+ and H+ gradient-dependent transport of p-aminohippurate in membrane vesicles from dog kidney cortex.
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狗肾皮质膜囊泡中对氨基马尿酸的 Na 和 H 梯度依赖性转运。

DOI:
10.1016/0006-2952(88)90258-4
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发表时间:
1988
影响因子:
5.8
通讯作者:
C. V. van Ginneken
C. V. van Ginneken
中科院分区:
医学2区
文献类型:
--
作者:
F. Russel;P. van der Linden;W. G. Vermeulen;M. Heijn;C. van Os;C. V. van Ginneken

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研究了对氨基马尿酸(PAH)在犬肾皮质基底外侧(BLMV)和刷状缘膜泡(BBMV)中的转运。施加内向的100mN Na+梯度可刺激BLMV摄取50μ的M[3 H]PAH,而pH梯度(pH=6.0,Phin=7.4)仅轻微促进摄取。丙磺舒和几种阴离子药物对多环芳烃的摄取呈电子中和饱和,对丙磺舒和几种阴离子药物的抑制敏感,其Km=0.79±0.16 mm,Vnmax=0.80±0.05nmol/mg蛋白,15s,KI,丙磺舒=0.08±0.01 mm。同时施加pH梯度(向外的OH-−梯度)和向内的Na+梯度对多环芳烃摄取的刺激作用显著高于单独使用安娜+梯度。这些结果与安娜+梯度刺激的基侧膜多环芳烃/羟基−交换机制相一致。在BBMV中,向外的OH−梯度和向内的Na+梯度都可以刺激多环芳烃的摄取。这两种梯度都可以通过介导的丙磺舒敏感途径来驱动多环芳烃的转运。Na+梯度刺激摄取为电刺激,表观Km=4.93±0.57 mm,Vmax=6.71±0.36nmol/mg蛋白,15s,KI,Prob=0.13±0.01 mm。多环芳烃/羟基−交换的动力学参数基本相同,表观Km=5.72±0.49 mm,Vmax=7.87±0.33nmol/mg蛋白,15秒和KI,Prob=0.16±0.02 mm。当同时施加Na+和pH(外向的OH−)梯度时,摄取的刺激几乎是单独施加安娜+或pH梯度时的两倍。这些结果表明,两种梯度都通过相同的途径刺激PAH在BBMV中的转运。然而,各种有机阴离子的抑制实验表明,Na+和pH梯度刺激的多环芳烃吸收的特异性并不完全重叠。因此,我们的结果支持BBMV中的一种简单的运输,但不能排除涉及两条不同的途径。
The transport ofp-aminohippurate (PAH) was studied in basolateral (BLMV) and brush border membrane vesicles (BBMV) isolated from dog kidney cortex. Imposition of an inwardly directed 100 mN Na+gradient stimulated the uptake of 50 μM [3H]PAH into BLMV, whereas a pH gradient (pHout= 6.0, pHin= 7.4) only slightly enhanced uptake. The Na+gradient-dependent uptake of PAH was electroneutral, saturable and sensitive to inhibition by probenecid and several anionic drugs, with (apparent)Km= 0.79 ± 0.16 mM, Vnmax= 0.80 ± 0.05 nmol/mg protein,15 sec andKi, for probenecid = 0.08 ± 0.01 mM. Simultaneous imposition of the pH gradient (outward OH−gradient) and inward Na+gradient stimulated PAH uptake significantly over that with an Na+gradient alone. These results are consistent with an Na+gradient-stimulated PAH/OH−exchange mechanism in the basolateral membrane. In BBMV, PAH uptake could be stimulated by an outwardly directed OH−gradient as well as an inward Na+gradient. Both gradients could drive PAH transport via a mediated probenecidsensitive pathway. Na+gradient-stimulated uptake was electrogenic with a (apparent)Km= 4.93 ± 0.57 mM,Vmax= 6.71 ± 0.36 nmol/mg protein,15 sec andKi,prob= 0.13 ± 0.01 mM. The kinetic parameters for PAH/OH−exchange were virtually the same, (apparent)Km= 5.72 ± 0.49 mM,Vmax= 7.87 ± 0.33 nmol/mg protein, 15 sec andKi,prob= 0.16 ± 0.02 mM. When both the Na+and pH (outward OH−) gradient were simultaneously imposed an almost twofold stimulation in uptake was observed over that with either an Na+or pH gradient alone. These results suggested that both gradients stimulate PAH transport in BBMV via the same pathway. However, inhibition experiments with various organic anions showed that the specificities of Na+and pH gradient-stimulated PAH uptake do not entirely overlap. Thus, our results support a simple transport in BBMV, but it cannot be excluded that two separate pathways are involved.
狗肾微绒毛膜囊泡中通过阴离子交换的尿酸盐转运。
DOI: 10.1152/ajprenal.1983.244.1.f56
发表时间: 1983
期刊: The American journal of physiology
影响因子: --
作者:
Kahn,AM;Aronson,PS
通讯作者: Aronson,PS
代谢性酸中毒犬肾基底外侧囊泡中谷氨酰胺的转运。
DOI: 10.1152/ajprenal.1984.246.1.f78
发表时间: 1984
期刊: The American journal of physiology
影响因子: --
作者:
Windus,DW;Cohn,DE;Klahr,S;Hammerman,MR
通讯作者: Hammerman,MR
DOI: 10.1152/ajprenal.1982.243.3.f293
发表时间: 1982
期刊: The American journal of physiology
影响因子: --
作者:
Cohn,DE;Hruska,KA;Klahr,S;Hammerman,MR
通讯作者: Hammerman,MR
兔肾皮质基底侧膜囊泡中的对氨基马尿酸转运:pH 和钠梯度的刺激。
DOI: 10.1016/0005-2736(87)90444-5
发表时间: 1987
期刊: Biochimica et biophysica acta
影响因子: --
作者:
Eveloff,J
通讯作者: Eveloff,J
狗肾基底外侧膜囊泡中 Na 梯度依赖性 Pi 吸收。
DOI: 10.1152/ajprenal.1984.246.5.f663
发表时间: 1984
期刊: The American journal of physiology
影响因子: --
作者:
Schwab,SJ;Klahr,S;Hammerman,MR
通讯作者: Hammerman,MR