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Ejaculatory abnormalities in mice lacking the gene for endothelial nitric oxide synthase (eNOS-/-)
L J Kriegsfeld1, G E Demas, P L Huang
1Department of Psychology, The Johns Hopkins University, Baltimore, MD 21218-2686, USA.
Physiology & Behavior
|November 5, 1999
Summary
Endothelial nitric oxide synthase (eNOS) impacts male reproductive function. Mice lacking eNOS showed altered ejaculation timing, suggesting eNOS involvement in ejaculatory physiology, not sexual drive.
Area of Science:
- Neuroscience
- Reproductive Physiology
- Molecular Biology
Background:
- Nitric oxide (NO) acts as a neurotransmitter in the nervous system.
- Three nitric oxide synthase (NOS) isoforms exist: endothelial (eNOS), inducible (iNOS), and neuronal (nNOS).
- Previous studies indicate NO's role in reproductive physiology and behavior, affecting sexual function.
Purpose of the Study:
- To investigate the specific role of the endothelial isoform of NOS (eNOS) in male reproductive behavior.
- To determine if eNOS influences sexual motivation and ejaculatory function.
Main Methods:
- Utilized gene-knockout mice lacking only the eNOS gene (eNOS-/-).
- Observed sexual behavior in eNOS-/- and wild-type (WT) mice over 45 minutes with an estrous female.
- Recorded mounting, intromissions, and ejaculation events.
Main Results:
- Both WT and eNOS-/- mice demonstrated similar sexual motivation.
- eNOS-/- mice exhibited significant alterations in ejaculatory function.
- eNOS-/- mice required fewer mounts and intromissions to achieve ejaculation compared to WT mice.
Conclusions:
- Endothelial nitric oxide synthase (eNOS) plays a role in regulating ejaculatory physiology.
- eNOS does not appear to be critical for male sexual motivation.
- NO synthesized by eNOS is implicated in the control of ejaculation timing.