Abstract
ATP-dependent trapping of [14C]methylamine was demonstrated in vesicles selectively derived from the sinusoidal plasma membrane of rat hepatocytes; activity was lacking in vesicles prepared from the canalicular domain of the plasma membrane of rat hepatocytes. The proton movement was inhibited by carbonyl cyanide p-trifluoromethoxyphenylhydrazone, strophanthidin, vanadate, amiloride, and absence of sodium. 22Na efflux from sinusoidal membrane vesicles increased inversely to extravesicular pH. The results indicate that the sinusoidal plasma membrane of rat hepatocytes contains a Na+/H+ antiport.
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