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Am J Physiol Cell Physiol 282: C817-C823, 2002. First published December 5, 2001; doi:10.1152/ajpcell.00352.2001
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Vol. 282, Issue 4, C817-C823, April 2002

Phosphorylation of the salivary Na+-K+-2Clminus cotransporter

Kinji Kurihara1,3, Nobuo Nakanishi2, Marilyn L. Moore-Hoon3, and R. James Turner3

Departments of 1 Oral Physiology and 2 Biochemistry, Meikai University, School of Dentistry, Sakada-shi, Saitama 350-0283, Japan; and 3 Membrane Biology Section, Gene Therapy and Therapeutics Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda MD 20892

We studied the phosphorylation of the secretory Na+-K+-2Cl- cotransporter (NKCC1) in rat parotid acinar cells. We have previously shown that NKCC1 activity in these cells is dramatically upregulated in response to beta -adrenergic stimulation and that this upregulation correlates with NKCC1 phosphorylation, possibly due to protein kinase A (PKA). We show here that when ATP is added to purified acinar basolateral membranes (BLM), NKCC1 is phosphorylated as a result of membrane-associated protein kinase activity. Additional NKCC1 phosphorylation is seen when PKA is added to BLMs, but our data indicate that this is due to an effect of PKA on endogenous membrane kinase or phosphatase activities, rather than its direct phosphorylation of NKCC1. Also, phosphopeptide mapping demonstrates that these phosphorylations do not take place at the site associated with the upregulation of NKCC1 by beta -adrenergic stimulation. However, this upregulatory phosphorylation can be mimicked by the addition of cAMP to permeabilized acini, and this effect can be blocked by a specific PKA inhibitor. These latter results provide good evidence that PKA is indeed involved in the upregulatory phosphorylation of NKCC1 and suggest that an additional factor present in the acinar cell but absent from isolated membranes is required to bring about the phosphorylation.

exocrine glands; fluid secretion; stimulus-secretion coupling; cation-chloride cotransporter


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