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Related Experiment Videos

Plasma and CSF GABA in affective illness

W H Berrettini, J I Nurnberger, T Hare

    The British Journal of Psychiatry : the Journal of Mental Science
    |November 1, 1982
    PubMed
    Summary

    This study found lower plasma levels of gamma-aminobutyric acid (GABA) in patients with bipolar disorder compared to healthy individuals. Genetic factors and seasonal variations may influence GABA levels in bipolar disorder.

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    Area of Science:

    • Neuroscience
    • Psychiatry
    • Biochemistry

    Background:

    • Bipolar disorder is a complex mood disorder with suspected neurochemical underpinnings.
    • Gamma-aminobutyric acid (GABA) is the primary inhibitory neurotransmitter in the central nervous system.
    • Previous research on GABA in bipolar disorder has yielded inconsistent results.

    Purpose of the Study:

    • To investigate the relationship between cerebrospinal fluid (CSF) and plasma GABA levels in bipolar patients.
    • To determine if plasma GABA levels differ between euthymic, medication-free bipolar patients and healthy controls.
    • To explore the influence of genetics and seasonality on GABA levels in bipolar disorder.

    Main Methods:

    • Measurement of GABA in CSF and plasma samples from bipolar patients and matched controls.

    Related Experiment Videos

  • Comparison of plasma GABA levels between bipolar patients and normal volunteers across two independent studies.
  • Analysis of plasma GABA levels in monozygotic twin pairs to assess genetic influence.
  • Bimonthly sampling over one year to evaluate diurnal and seasonal variations.

    • Main Results:

    • No significant correlation was found between CSF and plasma GABA levels.
    • Significantly lower plasma GABA levels were observed in euthymic, medication-free bipolar patients compared to normal volunteers (P < .02).
    • High correlation of plasma GABA levels was found between members of monozygotic twin pairs (P < .008).
    • Minimal diurnal variation was noted, with slightly higher GABA levels in late summer compared to late winter.

    Conclusions:

    • Plasma GABA levels may serve as a potential biomarker for bipolar disorder.
    • Genetic factors appear to play a significant role in regulating plasma GABA levels.
    • Seasonal variations might influence GABA levels, suggesting environmental interactions in bipolar disorder pathophysiology.