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Department of Biochemistry, McGill University, Montreal, Quebec, Canada H3G 1A4
The
Na+-K+-ATPase, or sodium pump, is the
membrane-bound enzyme that maintains the Na+ and
K+ gradients across the plasma membrane of animal cells.
Because of its importance in many basic and specialized cellular
functions, this enzyme must be able to adapt to changing cellular and
physiological stimuli. This review presents an overview of the
many mechanisms in place to regulate sodium pump activity in a
tissue-specific manner. These mechanisms include regulation by
substrates, membrane-associated components such as cytoskeletal
elements and the
-subunit, and circulating endogenous inhibitors as
well as a variety of hormones, including corticosteroids, peptide
hormones, and catecholamines. In addition, the review considers the
effects of a range of specific intracellular signaling pathways
involved in the regulation of pump activity and subcellular
distribution, with particular consideration given to the effects of
protein kinases and phosphatases.
-subunit; dopamine; norepinephrine; aldosterone; protein kinase
A; protein kinase C
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