SMALL LINEAR CHLORIDE CHANNELS ARE ENDOGENOUS TO NONEPITHELIAL CELLS

被引:37
作者
GABRIEL, SE [1 ]
PRICE, EM [1 ]
BOUCHER, RC [1 ]
STUTTS, MJ [1 ]
机构
[1] UNIV N CAROLINA,DEPT PHARMACOL,CHAPEL HILL,NC 27599
来源
AMERICAN JOURNAL OF PHYSIOLOGY | 1992年 / 263卷 / 03期
关键词
SINGLE-CHANNEL AND WHOLE CELL PATCH CLAMP; CYSTIC FIBROSIS TRANSMEMBRANE CONDUCTANCE REGULATOR;
D O I
10.1152/ajpcell.1992.263.3.C708
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
We used both single-channel and whole cell patch-clamp techniques to characterize chloride channels and currents endogenous to Sf9 cells, 3T3 fibroblasts, and Chinese hamster ovary cells. In cell-attached patches from these cell types, anion channels were observed with low ohmic conductance (4-11 ps), linear current-voltage relationships, and little time- or voltage-dependent behavior. These channels are very similar to the Cl- channels reported to appear concomitant with the expression of cystic fibrosis transmembrane conductance regulator (CFTR) in these cell lines. The presence of such endogenous channels suggests either that low levels of CFTR are present in all of these cell lines prior to transfection or that an endogenous non-CFTR channel is present in these cell types. Our results suggest that at least some of the channel behaviors attributed to expressed, recombinant CFTR in previous studies may have been due to these endogenous Cl- channels.
引用
收藏
页码:C708 / C713
页数:6
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