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Journal Article
Research Support, U.S. Gov't, P.H.S.
Distribution of immunoreactive Na+,K+-ATPase in gerbil cochlea.
Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society 1989 Februrary
The distribution of Na+,K+-ATPase was mapped in cochleas of mature gerbils with normal hearing, using a specific and sensitive immunocytochemical method. Na+,K+-ATPase was abundant in the basolateral plasma membrane of marginal cells in the stria vascularis. Considerable levels of enzyme were also associated with the surfaces of spiral ganglion neurons and their central and peripheral processes. An unexpected finding was the detection of high levels of immunoreactive Na+,K+-ATPase in three different populations of cells lying in the inferior portion of the spiral ligament and at the medial and lateral border of the scala vestibuli just superior to the attachment of Reissner's membrane. Cells in these areas shared the morphological characteristics of cells specialized for active transport but appeared to be nonpolarized, suggesting a uniform distribution of Na+,K+-ATPase over their entire plasmalemma. The presence of these three distinct cell populations in the cochlea of several mammalian species suggests that they play an important role in cochlear function, perhaps that of regulating the cation content of perilymph. The absence of discrete concentrations of Na+,K+-ATPase-rich cells in the perilymphatic connective tissue of the bird cochlea and the mammalian vestibular system suggests further that these cells may be involved with generating and maintaining the high endolymphatic potential unique to the mammalian cochlea.
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