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Corticotropin-releasing hormone (CRH) and GABA have been implicated in depression, and there is reason to believe that GABA may influence CRH functioning. The levels of CRH, and mRNA for CRH-binding protein, CRH1, and CRH2 receptors, as well as various GABA(A) receptor subunits (alpha1, alpha2, alpha3, alpha4, alpha5, delta, and gamma2), were determined in several frontal cortical brain regions of depressed suicide victims and nondepressed individuals who had not died by suicide. Relative to the comparison group, CRH levels were elevated in frontopolar and dorsomedial prefrontal cortex, but not in the ventrolateral prefrontal cortex of suicide victims. Conversely, using quantitative PCR analyses, it was observed that, in frontopolar cortex, mRNA for CRH1, but not CRH2, receptors were reduced in suicide brains, possibly secondary to the high levels of CRH activity. In addition, mRNA of the alpha1, alpha3, alpha4, and delta receptor subunits was reduced in the frontopolar region of suicide victims. Interestingly, a partial analysis of the GABA(A) receptor functional genome revealed high cross-correlations between subunit expression in cortical regions of nondepressed individuals, suggesting a high degree of coordinated gene regulation. However, in suicide brains, this regulation was perturbed, independent of overall subunit abundance. These findings raise the possibility that the CRH and GABA(A) receptor subunit changes, or the disturbed coordination between these GABA(A) receptor subunits, contribute to depression and/or suicidality or are secondary to the illness/distress associated with it.

the journal of neuroscience/the journal of neuroscience

Dysregulation in the Suicide Brain: mRNA Expression of Corticotropin-Releasing Hormone Receptors and GABA<sub>A</sub>Receptor Subunits in Frontal Cortical Brain Region

Dysregulation in the Suicide Brain: mRNA Expression of Corticotropin-Releasing Hormone Receptors and GABAAReceptor Subunits in Frontal Cortical Brain Region

Dysregulation in the Suicide Brain: mRNA Expression of Corticotropin-Releasing Hormone Receptors and GABA_AReceptor Subunits in Frontal Cortical Brain Region