ATP-dependent and DCCD-insensitive Cl- uptake by membrane vesicles from the rat brain plasma membrane fractions.
ATP-dependent Cl- uptake by membrane vesicles from the rat brain plasma membrane fractions was not affected by the addition of 40 mM of K+, Na+ or HCO3- to the assay medium. Na+ and K+ did not alter the uptake even in the presence of a K+ ionophore, valinomycin (10 microM), or a H+/K+ exchanger, nigericin (10 microM), whereas in the presence of both of these ionophores, K+, but not Na+, reduced the Cl- uptake. Inhibitors of proton pump activity, N,N'-dicyclohexylcarbodiimide (1 mM) and 5-(N,N-hexamethylene)amiloride (40 microM), however, did not affect the Cl- uptake. These findings suggest the presence of a primary Cl- transport system probably associated with passive H+ flux in the brain plasma membranes.
Shiroya
T
T
Department of Biology, Kyoto Pharmaceutical University, Japan.
Cragoe
E J
EJ
Inagaki
C
C
D000255:Adenosine Triphosphate / Q000502:physiology*; D000818:Animals; D001692:Biological Transport / Q000187:drug effects; D001921:Brain / Q000187:drug effects / Q000378:metabolism*; D002234:Carbodiimides / Q000494:pharmacology*; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism; D002463:Cell Membrane Permeability / Q000187:drug effects; D002712:Chlorides / Q000378:metabolism*; D004024:Dicyclohexylcarbodiimide / Q000494:pharmacology*; D007425:Intracellular Membranes / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D009994:Osmolar Concentration; D051381:Rats; D011919:Rats, Inbred Strains
D002234:Carbodiimides; D002712:Chlorides; D004024:Dicyclohexylcarbodiimide; D000255:Adenosine Triphosphate