Modulation of immune cell function following fluoxetine administration in rats

Pharmacology, Biochemistry, and Behavior
T C Pellegrino, B M Bayer

Abstract

Fluoxetine (FLX) and other specific serotonin uptake inhibitors (SSRIs) have become the drugs of choice for treating depression. However, only a limited number of studies have addressed the effects of FLX on immune cell function. Our lab has measured the effects of both acute and chronic FLX administration on two functions of cell-mediated immunity, mitogen-induced lymphocyte proliferation (MILP) and natural killer cell cytolytic activity (NKCA). In this article we report that acute FLX administration (10 mg/kg) resulted in a dose- and time-dependent decrease in MILP and NKCA. MILP was more sensitive than NKCA to FLX, requiring lower doses for inhibition; however, the effects were more transient. Following chronic FLX administration, these effects were no longer observed, suggesting that an apparent tolerance to these particular measures of cell-mediated immunity had developed. Finally, a single microinjection of FLX directly into the lateral ventricle produced similar suppressive effects on MILP and NKCA, suggesting that the immunomodulatory mechanism may have a central component.

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