Traditional and emerging roles for the SLC9 Na+/H+ exchangers

被引:137
作者
Fuster, Daniel G. [1 ,2 ]
Alexander, R. Todd [3 ]
机构
[1] Univ Bern, Div Nephrol Hypertens & Clin Pharmacol, Bern, Switzerland
[2] Univ Bern, Inst Biochem & Mol Med, Bern, Switzerland
[3] Univ Alberta, Dept Pediat, Div Nephrol, Fac Med & Dent, Edmonton, AB, Canada
来源
PFLUGERS ARCHIV-EUROPEAN JOURNAL OF PHYSIOLOGY | 2014年 / 466卷 / 01期
基金
瑞士国家科学基金会;
关键词
Sodium/hydrogen exchanger; NHE; SLC9; SODIUM-LITHIUM COUNTERTRANSPORT; LINKED MENTAL-RETARDATION; PROTEIN-KINASE-A; MOLECULAR-CLONING; PLASMA-MEMBRANE; SODIUM/PROTON EXCHANGER; MICE LACKING; MYOCARDIAL-INFARCTION; FUNCTIONAL EXPRESSION; TARGETED DISRUPTION;
D O I
10.1007/s00424-013-1408-8
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
The SLC9 gene family encodes Na+/H+ exchangers (NHEs). These transmembrane proteins transport ions across lipid bilayers in a diverse array of species from prokaryotes to eukaryotes, including plants, fungi, and animals. They utilize the electrochemical gradient of one ion to transport another ion against its electrochemical gradient. Currently, 13 evolutionarily conserved NHE isoforms are known in mammals [22, 46, 128]. The SLC9 gene family (solute carrier classification of transporters: www.bioparadigms.org) is divided into three subgroups [46]. The SLC9A subgroup encompasses plasmalemmal isoforms NHE1-5 (SLC9A1-5) and the predominantly intracellular isoforms NHE6-9 (SLC9A6-9). The SLC9B subgroup consists of two recently cloned isoforms, NHA1 and NHA2 (SLC9B1 and SLC9B2, respectively). The SLC9C subgroup consist of a sperm specific plasmalemmal NHE (SLC9C1) and a putative NHE, SLC9C2, for which there is currently no functional data [46]. NHEs participate in the regulation of cytosolic and organellar pH as well as cell volume. In the intestine and kidney, NHEs are critical for transepithelial movement of Na+ and HCO3- and thus for whole body volume and acid-base homeostasis [46]. Mutations in the NHE6 or NHE9 genes cause neurological disease in humans and are currently the only NHEs directly linked to human disease. However, it is becoming increasingly apparent that members of this gene family contribute to the pathophysiology of multiple human diseases.
引用
收藏
页码:61 / 76
页数:16
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