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Am J Psychiatry. 1998 May;155(5):666-71.

Dynamics of ECT normalization of low G protein function and immunoreactivity in mononuclear leukocytes of patients with major depression.

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  • 1Department of Clinical Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel.



Heterotrimeric G proteins were previously implicated in the biochemical mechanisms underlying the pathophysiology and treatment of mood disorders. Low function and immunoreactivity of G proteins were observed in patients with major depression. In the present study the authors evaluated the effects of ECT on the low measures of G proteins in patients with major depression.


Repeated G protein measurements in mononuclear leukocytes of 10 patients with major depression were made. Each patient was examined while untreated and after successive sessions of ECT; 14 normal subjects were also studied. G protein function was evaluated through beta-adrenergic- and muscarinic-agonist-enhanced guanine nucleotide binding capacity, substantiated by quantitative measures of G proteins through immunoblot analyses using polyclonal antibodies against Gs alpha, Gi alpha, and G beta proteins.


Mononuclear leukocytes of patients with depression showed immunoreactive levels of Gs alpha and Gi alpha that were significantly lower than those of normal subjects; the depressed patients also had markedly hypofunctional Gs and Gi. The low levels of G protein function and immunoreactivity were alleviated by ECT. Repeated measurements in the same patients after successive ECT sessions showed that the normalization of G protein measures preceded, and thus predicted, clinical improvement. The function and quantity of Gs and Gi proteins in patients given ECT were significantly correlated.


These findings support the implication of G proteins in the pathophysiology and treatment of mood disorders. G protein measurements in patients with depression may potentially serve not only as a biochemical marker for affective state but also for biochemical prediction and evaluation of responses to ECT.

[PubMed - indexed for MEDLINE]
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