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Am J Physiol Renal Physiol 281: F531-F545, 2001;
0363-6127/01 $5.00
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Vol. 281, Issue 3, F531-F545, September 2001

Immunocytochemical localization of Na-K-ATPase alpha - and gamma -subunits in rat kidney

Randall K. Wetzel and Kathleen J. Sweadner

Laboratory of Membrane Biology, Neuroscience Center, Massachusetts General Hospital, Charlestown, Massachusetts 02129

The gamma -subunit of the Na-K-ATPase is a single-span membrane protein that alters the kinetic properties of the enzyme. It is expressed in the kidney, but our initial observations indicated that it is not present in all nephron segments (Arystarkhova E, Wetzel RK, Asinovski NK, and Sweadner KJ. J Biol Chem 274: 33183-33185, 1999). Here we used triple-label confocal immunofluorescence microscopy in rat kidney with antibodies to Na-K-ATPase alpha 1- and gamma -subunits and nephron segment-specific markers. Na-K-ATPase alpha 1-subunit stain was low but unambiguous in proximal segments, moderate in macula densa, connecting tubules, and cortical collecting ducts, high in thick ascending limb and distal convoluted tubules, and nearly undetectable in glomeruli, descending and ascending thin limb, and medullary collecting ducts. The gamma -subunit colocalized at staining levels similar to alpha 1-subunit in basolateral membranes in all segments except cortical thick ascending limb and cortical collecting ducts, which had alpha 1-subunit but no detectable gamma -subunit stain. Selective gamma -subunit expression may contribute to the variations in Na-K-ATPase properties in different renal segments.

immunofluorescence; confocal microscopy; nephron; colocalization; sodium pump


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