Changes of K+ activities in the stria vascularis during anoxia.
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The DC potential and K<SUP>+</SUP> activity in the stria vascularis were simultaneously recovered from normal and Kanamycin-deafened guinea pigs, using K<SUP>+</SUP>-selective microelectrode. The positive DC potential, possibly the resting potential of marginal cell, was approximately 40-80mV and significantly lower than the endocochlear potential (EP). During anoxia, that DC potential of both groups showed parallel decreases. The K<SUP>+</SUP> activity ranged from 20 to 60mEq/1 and was much lower than that of the endolymph before and during anoxia in both groups. These results suggest that K<SUP>+</SUP> pumps may exist at the basolateral and luminal membranse of the strial marginal cell.
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