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Related Experiment Videos

Postmortem cerebral cortex Gs alpha-subunit levels are elevated in bipolar affective disorder.

L T Young1, P P Li, S J Kish

  • 1Department of Psychiatry, University of Toronto, Clarke Institute of Psychiatry, Toronto, Canada.

Brain Research
|July 12, 1991
PubMed
Summary

This study found elevated levels of the Gs alpha protein in the brains of bipolar affective disorder (BAD) patients. These findings suggest altered Gs-mediated signal transduction may contribute to the disorder's pathophysiology.

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Area of Science:

  • Neuroscience
  • Biochemistry

Background:

  • Bipolar affective disorder (BAD) is a complex mental health condition.
  • The role of G-protein signaling pathways in BAD pathophysiology remains incompletely understood.

Purpose of the Study:

  • To investigate the relative abundance of specific G-protein subunits in the postmortem brain of individuals with BAD compared to controls.
  • To explore potential alterations in Gs-mediated signal transduction in BAD.

Main Methods:

  • Postmortem prefrontal cortex tissue from 7 BAD patients and 7 matched controls was analyzed.
  • G-protein subunit immunoreactivities were quantified using SDS-PAGE and immunoblotting techniques.
  • Specific antibodies were used to detect Gs alpha, Gi(1&2) alpha, Go alpha, and G beta(1&2) subunits.

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Main Results:

  • Significantly elevated Gs alpha immunoreactivity was observed in the frontal cortex (+34%) and occipital cortex (+80%) of BAD patients compared to controls (P < 0.05).
  • A non-significant increase in Gs alpha immunoreactivity was noted in the cerebellum (+22%) of BAD patients.
  • No significant differences were found for other examined G-protein subunits.

Conclusions:

  • The findings suggest that increased Gs alpha immunoreactivity in specific brain regions may indicate enhanced functional responsiveness of receptor-effector units in BAD.
  • Disturbances in Gs-mediated signal transduction are implicated as a potential contributing factor to the pathophysiology of bipolar affective disorder.