Effects of nitric oxide synthesis inhibition on the Na,K-ATPase activity in the kidney.
The present study was aimed at investigating the role of endogenous nitric oxide (NO) in regulating Na,K-ATPase activity in the kidney. The expression of alpha-1 and beta-1 subunits; and the enzymatic activity of Na,K-ATPase were determined in the kidney of rats treated with an NO synthase inhibitor, N(G)-nitro-L-arginine methyl ester (L-NAME). Following the treatment with L-NAME in the drinking water for 4 weeks, Na,K-ATPase activity was increased while tissue nitrite/nitrate levels were decreased in the kidney. Supplementation with L-arginine prevented the L-NAME-induced changes. The expression of either alpha-1 or beta-1 subunit protein of Na,K-ATPase, assessed by Western blot analysis, was not affected by L-NAME-treatment. An acute in vitro treatment of the kidney with L-NAME also caused an increase of Na,K-ATPase activity; which was again prevented by cotreatment with L-arginine. On the contrary, treatment with sodium nitroprusside significantly decreased Na,K-ATPase activity. These results suggest that the endogenous NO plays a direct inhibitory role on Na,K-ATPase activity in the kidney.
Kang
D G
DG
Department of Physiology, Chonnam University Medical School, 5 Hak-dong, Kwangju, 501-190, Korea.
Kim
J W
JW
Lee
J
J
D000818:Animals; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D007668:Kidney / Q000201:enzymology*; D008297:Male; D019331:NG-Nitroarginine Methyl Ester / Q000494:pharmacology*; D009569:Nitric Oxide / Q000502:physiology; D019001:Nitric Oxide Synthase / Q000037:antagonists & inhibitors*; D051381:Rats; D017207:Rats, Sprague-Dawley; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism*
D004791:Enzyme Inhibitors; D009569:Nitric Oxide; D019001:Nitric Oxide Synthase; D000254:Sodium-Potassium-Exchanging ATPase; D019331:NG-Nitroarginine Methyl Ester