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Activation of rat cerebellum granule cells by N-methyl-D-aspartate (NMDA, 10(-4)-10(-3) M) results in progressive increase in reactive oxygen species (ROS) and suppression of the ouabain-sensitive part of Na/K-ATPase activity. When Na/K-ATPase was inhibited by high ouabain concentrations (10(-5)-5 x 10(-4) M), an increase in stationary ROS level in neuronal cells was noted, this effect being attenuated by NMDA antagonists, MK-801 and D-AP5. It is concluded that in cerebellum neurons, ouabain-resistant Na/K-ATPase is responsible for suppression of intracellular level of ROS, which, in turn, inhibit ouabain-sensitive Na/K-ATPase.

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