Rabbit retinal neurons and glia express a variety of ENaC/DEG subunits

被引:67
作者
Brockway, LM
Zhou, ZH
Bubien, JK
Jovov, B
Benos, DJ
Keyser, KT
机构
[1] Univ Alabama, Vis Sci Res Ctr, Birmingham, AL 35294 USA
[2] Univ Alabama, Dept Physiol & Biophys, Birmingham, AL 35294 USA
来源
AMERICAN JOURNAL OF PHYSIOLOGY-CELL PHYSIOLOGY | 2002年 / 283卷 / 01期
关键词
epithelial sodium channel; amiloride; retina; reverse transcriptase-polymerase chain reaction; patch clamp;
D O I
10.1152/ajpcell.00457.2001
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Some members of the epithelial Na+ channel/degenerin (ENaC/DEG) family of ion channels have been detected in mammalian brain. Therefore, we examined the RNA and protein expression of these channels in another part of the central nervous system, the rabbit retina. We next sought to demonstrate physiological evidence for an amiloride-sensitive current in Muller glia, which, on the basis of a previous study, are thought to express alpha-ENaC (Golestaneh N, de Kozak Y, Klein C, and Mirshahi M. Glia 33: 160-168, 2001). RT-PCR of retinal RNA revealed the presence of alpha-, beta-, gamma-, and delta-ENaC as well as acid-sensing ion channel (ASIC) 1, ASIC2, ASIC3, and ASIC4. Immunohistochemical localization with antibodies against alpha-ENaC and beta-ENaC showed labeling in Muller cells and neurons, respectively. The presence of alpha-ENaC, beta-ENaC, and ASIC1 was detected by Western blotting. Cultured Muller cells were whole cell patch clamped. These cells exhibited an inward Na+ current that was blocked by amiloride. These data demonstrate for the first time both the expression of a variety of ENaC and ASIC subunits in the rabbit retina as well as distinct cellular expression patterns of specific subunits in neurons and glia.
引用
收藏
页码:C126 / C134
页数:9
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