Abstract
Microsomal fractions were prepared from rat and guinea pig cerebral cortex. The Na, K, Mg-activated adenosine triphosphatase (Na, K, Mg-activated ATPase) activity of these fractions was consistently inhibited by diphenylhydantoin in concentration of 10 −4 M during experiments in vitro. Ouabain-induced inhibition was also increased by the addition of diphenylhydantoin. Neither diphenylhydantoin nor ouabain in concentrations up to 10 −3 M had any effect on Mg-activated ATPase activity. Whole homogenates of human cerebral cortex showed similar reactions.
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