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Gender and the Renal Nitric Oxide Synthase System in Healthy Humans

Sofia B. Ahmed^*, Naomi D.L. Fisher, and Norman K. Hollenberg^,

^* Department of Medicine, University of Calgary, Calgary, Alberta, Canada; and Departments of Medicine and Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts

Correspondence: Dr. Sofia B. Ahmed, Foothills Medical Centre, 1403 29th Street NW, Room C201D, Calgary, Alberta, Canada T2N 2T9. Phone: 403-944-8168; Fax: 403-944-2876; E-mail: sofia.ahmed{at}calgaryhealthregion.ca

Background and Objectives: It is widely known that men with kidney disease progress to ESRD at a much greater rate than do women. The mechanism for these gender differences is not clear, but reduced availability of nitric oxide is thought to contribute to the age-related decline in renal plasma flow observed in both healthy men and women. Animal models suggest that the renal vasculature of men may be significantly more dependent on nitric oxide than that of women.

Design, Setting, Participants, & Measurements: Renal plasma flow response to the nonspecific nitric oxide synthase inhibitor nitro-L-arginine methyl ester (L-NAME) was measured by para-aminohippurate clearance technique in 21 healthy, normotensive (8 male, 13 female) individuals in balance on a high-salt diet.

Results: There were striking differences between the genders in the renal hemodynamic response to L-NAME according to age, a difference that remained even after adjustment for other significant covariates. In men, the fall in renal plasma flow induced by L-NAME increased remarkably with increasing age. In women, there was no influence of age on the renovascular response to L-NAME. Neither age nor gender predicted the mean arterial pressure response to L-NAME.

Conclusions: The renal vasculature of men becomes more dependent on nitric oxide with age compared with that of women, suggesting that any renal disease that interferes with nitric oxide production may, over time, cause existent kidney damage to progress more quickly in men relative to women.