M. Mckee et al., NITRIC-OXIDE, CGMP, AND HORMONE REGULATION OF ACTIVE SODIUM-TRANSPORT, Proceedings of the National Academy of Sciences of the United Statesof America, 91(25), 1994, pp. 12056-12060
The inter- and intracellular regulator nitric oxide (NO) has been sugg
ested to play a role in the modulation of cellular excitability, but t
he mechanism(s) by which this occurs remain unclear. Using the kidney
as a model system, we report here evidence that NO, produced in respon
se to various hormones and cytokines, can effect long-term alterations
in the activity of the membrane sodium pump. This regulation of Na,K-
ATPase, which occurs in a system of NO containing renal tubules, invol
ves cGMP and cGMP-dependent protein kinase. Na,K-ATPase can also be re
gulated by alterations of cGMP initiated through NO-independent factor
s, such as atriopeptin, and in nonrenal tissues, such as cerebellum. R
egulation of the membrane sodium pump by NO and cGMP, therefore, repre
sents a mechanism for hormonal modulation of ion gradients, not only i
n kidney but also in other organs, including brain, where NO and cGMP
play a prominent role in cellular function.