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Related Experiment Videos

Altered brain protein kinase C in depression: a post-mortem study.

M A Coull1, S Lowther, C L Katona

  • 1Department of Pharmacology and Clinical Pharmacology, St. George's Hospital Medical School, SW17 ORE, London, UK.

European Neuropsychopharmacology : the Journal of the European College of Neuropsychopharmacology
|June 29, 2000
PubMed
Summary

Depression may involve protein kinase C, as indicated by altered [(3)H]Phorbol 12,13-dibutyrate (PDBu) binding in the brain of individuals who died by suicide and were not on antidepressants.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Psychiatry

Background:

  • Protein kinase C (PKC) is implicated in cellular signaling pathways relevant to mood disorders.
  • Altered PKC activity has been suggested in the pathophysiology of depression.
  • The specific role of PKC in depression remains incompletely understood.

Purpose of the Study:

  • To investigate the role of protein kinase C (PKC) in depression by examining [(3)H]Phorbol 12,13-dibutyrate (PDBu) binding.
  • To compare PDBu binding in the frontal cortex and hippocampus of individuals with depression who died by suicide with matched controls.
  • To differentiate findings based on antidepressant treatment status and cause of death.

Main Methods:

  • Measurement of [(3)H]PDBu binding in soluble and particulate fractions of frontal cortex and hippocampus.

Related Experiment Videos

  • Analysis of post-mortem brain tissue from suicides diagnosed with depression and individually matched controls.
  • Stratification of suicides into antidepressant-free (≥3 months) and antidepressant-treated groups.

    • Main Results:

    • Antidepressant-free suicides showed a 75% increase in soluble [(3)H]PDBu binding sites in the frontal cortex compared to controls.
    • Significant alterations in the distribution of soluble and particulate binding sites were observed in the frontal cortex of antidepressant-free suicides.
    • Increased particulate [(3)H]PDBu binding in the hippocampus of antidepressant-free suicides was noted, particularly in those who died by violent means.
    • No significant differences in PDBu binding were found in antidepressant-treated suicides compared to controls.

    Conclusions:

    • The findings suggest a role for protein kinase C in the pathophysiology of depression, particularly in individuals not receiving antidepressant treatment.
    • Altered PKC signaling may contribute to the neurobiological changes associated with severe depression.
    • Further research is warranted to elucidate the precise mechanisms linking PKC to depression and its treatment.