Swelling, NEM, and A23187 activate Cl(-)-dependent K+ transport in high-K+ sheep red cells.

Swelling, NEM, and A23187 activate Cl(-)-dependent K+ transport in high-K+ sheep red cells.
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肿胀、NEM 和 A23187 激活高 K 绵羊红细胞中 Cl(-) 依赖性 K 转运。

DOI:
10.1152/ajpcell.1987.252.2.c197
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发表时间:
1987
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Lauf,PK
Lauf,PK
中科院分区:
--
文献类型:
--
作者:
Fujise,H;Lauf,PK

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在低K+ (LK)羊红细胞中,当Cl-被除Br- (Cl(-)依赖性K+通量)以外的其他Hofmeister系列阴离子取代时,很大一部分总抗瓦巴因(OR) K+通量被抑制。相比之下,等渗培养基中高K+ (HK)羊红细胞当Cl-被NO3-或I-取代时,没有明显的或Cl(-)依赖的K+通量。然而,暴露于低氧溶液中,用巯基(SH)基团试剂n -乙基马酰亚胺(NEM)或在没有外部Me2+的情况下用二价金属离子(Me2+)离子载体A23187处理,会导致Cl(-)依赖性K+转运的显著激活,以Rb+作为K+同系物进行测量。当Mn2+、Mg2+和Ca2+浓度为1mm时,a23187处理的细胞中没有Cl(-)依赖性Rb+通量,这表明这些Me2+的细胞积累是抑制性的。与LK红细胞类似,当用NEM预处理时,HK红细胞对A23187没有反应,这支持了最近提出的假设(Lauf, P. K. J. Membr.)。生物学杂志。88(1):1-13,1985)的一个共同机制的依赖Cl(-)的K+转运激活。在HK细胞中,Cl(-)依赖性Rb+通量的大小比在LK红细胞中相同处理所引起的要小得多,并且所有干预的效果都不是由于已知具有Cl(-)依赖性K+运输的网状红细胞的存在。(摘要删节250字)
In low K+ (LK) sheep red cells a significant fraction of the total ouabain-resistant (OR) K+ flux is inhibited when Cl- is replaced by other anions of the Hofmeister series except Br- (Cl(-)-dependent K+ flux). In contrast, high K+ (HK) sheep red cells in isosmotic media did not possess any significant OR Cl(-)-dependent K+ flux when Cl- was replaced by NO3- or I-. However, exposure to hyposmotic solutions, treatment with the sulfhydryl (SH) group reagent N-ethylmaleimide (NEM) or with the bivalent metal ion (Me2+) ionophore A23187 in absence of external Me2+ caused a significant activation of Cl(-)-dependent K+ transport as measured with Rb+ as K+ congener. There was no Cl(-)-dependent Rb+ flux in A23187-treated cells when Mn2+, Mg2+, and Ca2+ were present at 1 mM concentrations, suggesting that cellular accumulation of these Me2+ is inhibitory. Similar to LK red cells, HK red cells failed to respond to A23187 when pretreated with NEM supporting the hypothesis proposed recently (Lauf, P. K. J. Membr. Biol. 88: 1-13, 1985) of a common mechanism of Cl(-)-dependent K+ transport activation. The magnitudes of the Cl(-)-dependent Rb+ fluxes in HK cells were much smaller than those elicited by identical treatments in LK red cells, and the effect of all interventions was not due to the presence of reticulocytes known to possess Cl(-)-dependent K+ transport.(ABSTRACT TRUNCATED AT 250 WORDS)
A23187 和 Ca2+ 对低 K+ 绵羊红细胞中容量刺激和硫醇刺激、耐哇巴因 K+Cl− 通量的影响☆
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