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(Hypertension. 2007;50:663.)
© 2007 American Heart Association, Inc.

Original Articles

Differential Regulation of NADPH Oxidase in Sympathetic and Sensory Ganglia in Deoxycorticosterone Acetate–Salt Hypertension

Xian Cao; Xiaoling Dai; Lindsay M. Parker; David L. Kreulen

From the Departments of Physiology (X.C., L.M.P., D.L.K.), Neurology and Ophthalmology (D.L.K.), Pharmacology and Toxicology (X.D.), and Neuroscience Program (X.C., X.D., D.L.K.), Michigan State University, East Lansing.

Correspondence to David L. Kreulen, Department of Physiology, 2201 Biomedical Physical Sciences, Michigan State University, East Lansing, MI 48824. E-mail dkreulen{at}msu.edu

We demonstrated recently that superoxide anion levels are elevated in prevertebral sympathetic ganglia of deoxycorticosterone acetate–salt hypertensive rats and that this superoxide anion is generated by reduced nicotinamide-adenine dinucleotide phosphate oxidase. In this study we compared the reduced nicotinamide-adenine dinucleotide phosphate oxidase enzyme system of dorsal root ganglion (DRG) and sympathetic celiac ganglion (CG) and its regulation in hypertension. The reduced nicotinamide-adenine dinucleotide phosphate oxidase activity of ganglion extracts was measured using fluorescence spectrometry of dihydroethidine; the activity in hypertensive dorsal root ganglion was 34% lower than in normotensive DRG. In contrast, activity was 79% higher in hypertensive CG than normotensive CG. mRNA for the oxidase subunits NOX1, NOX2, NOX4, p47^phox, and p22^phox were present in both CG and DRG; mRNA for NOX4 was significantly higher in CG than in DRG. The levels of mRNA and protein expression of the membrane-bound catalytic subunit p22^phox and of the regulatory subunits p47^phox and Rac-1 were measured in CG and DRG in normotensive and hypertensive rats. p22^phox mRNA and protein expression was greater in CG of hypertensive rats but not in DRG. Compared with normotensive controls, p47^phox mRNA and protein, as well as Rac-1 protein, were significantly decreased in hypertensive DRG but not in CG. Immunohistochemical staining of p47^phox showed translocation from cytoplasm to membrane in hypertensive CG but not in hypertensive DRG. This suggests that reduced nicotinamide-adenine dinucleotide phosphate oxidase activation in sympathetic neurons and sensory neurons is regulated in opposite directions in hypertension. This differential regulation may contribute to unbalanced vasomotor control and enhanced vasoconstriction in the splanchnic circulation.

Key Words: superoxide • sympathetic ganglia • sensory ganglia • NADPH oxidase • rat • hypertension

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