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Neurotransmitters: central and peripheral mechanisms.

K E Andersson1

  • 1Department of Clinical Pharmacology, University of Lund, Lund, Sweden. Karl-Erik.Andersson@klinfarm.lu.se

International Journal of Impotence Research
|October 18, 2000
PubMed
Summary

Erectile function involves complex neural pathways and neurotransmitters. Nitric oxide (NO) is key for penile smooth muscle relaxation, while other factors like noradrenaline cause contraction.

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Area of Science:

  • Neuroscience
  • Urology
  • Physiology

Background:

  • Penile erection is a complex reflex involving autonomic and somatic pathways.
  • Supraspinal centers modulate spinal cord-mediated erection reflexes.
  • Neurotransmitter balance is crucial for regulating penile smooth muscle tone.

Purpose of the Study:

  • To review the neurochemical control of penile erection.
  • To elucidate the roles of various neurotransmitters and factors in erectile function.
  • To understand the peripheral mechanisms regulating penile smooth muscle contraction and relaxation.

Main Methods:

  • Review of existing literature on the neurophysiology of erection.
  • Analysis of the roles of different neurotransmitters (dopamine, acetylcholine, NO, oxytocin, ACTH/alpha-MSH, serotonin, enkephalins).
  • Examination of peripheral factors influencing corpus cavernosum smooth muscle tone.

Main Results:

  • Dopamine, acetylcholine, nitric oxide (NO), oxytocin, and ACTH/alpha-MSH generally facilitate erection.
  • Serotonin can be facilitatory or inhibitory; enkephalins are inhibitory.
  • Noradrenaline contracts penile smooth muscle via alpha1-adrenoceptors; NO is the primary relaxant.
  • The roles of endothelins and other neuro-endothelial mediators remain unclear.

Conclusions:

  • Penile erection is regulated by a complex interplay of central and peripheral factors.
  • Nitric oxide is the principal mediator of penile smooth muscle relaxation.
  • Further research is needed to clarify the roles of less-established mediators in erectile function.

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