Abstract
Background
Nitric oxide (NO) has been implicated as a mediator of penile erection, because the neuronal isoform of NO synthase (NOS) is localized to the penile innervation and NOS inhibitors selectively block erections. NO can also be formed by two other NOS isoforms derived from distinct genes, inducible NOS (iNOS) and endothelial NOS (eNOS). To clarify the source of NO in penile function, we have examined mice with targeted deletion of the nNOS gene (nNOS− mice).
Materials and Methods
Mating behavior, electro-physiologically induced penile erection, isolated erectile tissue isometric tension, and eNOS localization by immunohistochemistry and Western blot were performed on nNOS− mice and wild-type controls.
Results
Both intact animal penile erections and isolated erectile tissue function are maintained in nNOS mice, in agreement with demonstrated normal sexual behaviors, but is stereospecifically blocked by the NOS inhibitor, L-nitroarginine methyl ester (L-NAME). eNOS is abundantly present in endothelium of penile vasculature and sinusoidal endothelium within the corpora cavernosa, with levels that are significantly higher in nNOS− mice than in wild-type controls.
Conclusions
eNOS mediates NO-dependent penile erection in nNOS− animals and normal penile erection. These data clarify the role of nitric oxide in penile erection and may have implications for therapeutic agents with selective effects on NOS isoforms.
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Acknowledgments
This work was supported by a New Investigator Grant from the American Foundation for Urologic Disease with funds contributed by G. D. Searle (ALB); USPHS Grants HD22201 and CA58618 (RJN); USPHS Grant DA-00266 and Research Scientist Award DA-0074 (SHS), USPHS CIDA NS-01578 and NS33277, the Paul Beeson Physician Scholars in Aging Research Program, and the International Life Sciences Institute (TMD); and USPHS Grant NS33142 (VLD).
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Burnett, A.L., Nelson, R.J., Calvin, D.C. et al. Nitric Oxide-Dependent Penile Erection in Mice Lacking Neuronal Nitric Oxide Synthase. Mol Med 2, 288–296 (1996). https://doi.org/10.1007/BF03401627
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DOI: https://doi.org/10.1007/BF03401627