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Related Experiment Videos

Neuroactive steroids.

S M Paul1, R H Purdy

  • 1Section on Molecular Pharmacology, National Institute of Mental Health, Bethesda, Maryland 20892.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|March 1, 1992
PubMed
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Neuroactive steroids rapidly modulate neuronal excitability by interacting with neurotransmitter receptors. These steroids, like allopregnanolone, influence the central nervous system through non-genomic mechanisms, impacting conditions related to stress and hormonal cycles.

Area of Science:

  • Neuroscience
  • Endocrinology
  • Pharmacology

Background:

  • Neuroactive steroids are endogenous or synthetic compounds that rapidly alter neuronal excitability.
  • Key examples include progesterone and deoxycorticosterone metabolites like allopregnanolone and allotetrahydroDOC.
  • These steroids bind to membrane receptors, notably gamma-amino-butyric acid (GABA) receptors, influencing neuronal function.

Purpose of the Study:

  • To review the mechanisms of action of neuroactive steroids.
  • To highlight their diverse effects on neuronal excitability, including both inhibitory and excitatory pathways.
  • To discuss their potential roles as neuromodulators in the central nervous system.

Main Methods:

  • Review of biochemical and electrophysiological studies on neuroactive steroids.

Related Experiment Videos

  • Analysis of steroid interactions with GABA and excitatory amino acid receptors.
  • Measurement of neurosteroid levels in brain and plasma under various physiological conditions.

    • Main Results:

    • 3 alpha-hydroxysteroids, such as allopregnanolone, augment GABA-activated chloride currents, similar to barbiturates.
    • Some steroids act as GABA(A) receptor antagonists, while others modulate excitatory amino acid receptors.
    • Neurosteroid levels, including allopregnanolone, fluctuate with stress and reproductive cycles.

    Conclusions:

    • Neuroactive steroids represent a significant class of neuromodulators.
    • They rapidly alter central nervous system excitability through non-genomic mechanisms.
    • Their diverse receptor interactions suggest broad implications for neurological function and potential therapeutic applications.