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Functional inhibition of native volume-sensitive outwardly rectifying anion channels in muscle cells and Xenopus oocytes by anti-ClC-3 antibody.
Duan D
,
Zhong J
,
Hermoso M
,
Satterwhite CM
,
Rossow CF
,
Hatton WJ
,
Yamboliev I
,
Horowitz B
,
Hume JR
.
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Intracellular dialysis of NIH/3T3 cells with a commercially available anti-ClC-3 polyclonal antibody (Ab) for approximately 30 min completely inhibited expressed guinea-pig ClC-3 currents (IgpClC-3), while intracellular dialysis with antigen-preabsorbed anti-ClC-3 Ab failed to affect IgpClC-3. Anti-ClC-3 Ab was used as a selective probe to examine the relationship between endogenous ClC-3 expression and native volume-sensitive outwardly rectifying anion channels (VSOACs) in guinea-pig cardiac cells, canine pulmonary arterial smooth muscle cells (PASMCs) and Xenopus laevis oocytes. Intracellular dialysis or injection of anti-ClC-3 Ab abolished native VSOAC function in cardiac cells and PASMCs and significantly reduced VSOACs in oocytes. In contrast, native VSOAC function was unaltered by antigen-preabsorbed anti-ClC-3 Ab. It is suggested that endogenous ClC-3 represents a major molecular entity responsible for native VSOACs in cardiac and smooth muscle cells and Xenopus oocytes. Anti-ClC-3 Ab should be a useful experimental tool to directly test the relationship between endogenous ClC-3 expression and native VSOAC function, and help resolve existing controversies related to the regulation and physiological role of native VSOACs in a wide variety of different cells.
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