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Maes, M. et al.

Negative immunoregulatory effects of antidepressants: inhibition of interferon-gamma and stimulation of interleukin-10 secretion.

There is now some evidence that major depression is accompanied by activation of the inflammatory response system. There is also some evidence that antidepressants may suppress the release of cytokines, such as interleukin-1 beta (IL-1 beta) and IL-6 by activated monocytes and IL-2 and interferon-gamma (IFN gamma) by activated T cells. This study was carried out to examine the effects of clomipramine, sertraline, and trazodone on the stimulated production of IFN gamma, a pro-inflammatory cytokine, and IL-10, a negative immunoregulatory cytokine. Whole blood of nine healthy volunteers was stimulated with PHA, 5 micrograms/mL and LPS, 25 micrograms/mL for 72 hr with and without incubation with clomipramine, 10(-6) and 10(-9) M, sertraline, 10(-6) and 10(-8) M, and trazodone, 10(-6) and 10(-8) M. All three antidepressants significantly reduced IFN gamma secretion, whereas clomipramine and sertraline significantly increased IL-10 secretion in culture supernatant. All three antidepressants significantly reduced the IFN gamma/IL-10 ratio. The results suggest that antidepressants, at concentrations in the therapeutical range, have negative immunoregulatory effects through inhibition of IFN gamma and stimulation of IL-10 release.[1]

References

Negative immunoregulatory effects of antidepressants: inhibition of interferon-gamma and stimulation of interleukin-10 secretion. Maes, M., Song, C., Lin, A.H., Bonaccorso, S., Kenis, G., De Jongh, R., Bosmans, E., Scharpé, S. Neuropsychopharmacology (1999) [Pubmed]

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