Antidepressant-like actions of pregnancy, and progesterone in Wistar rats forced to swim

Psychoneuroendocrinology
M Molina-Hernández, N P Téllez-Alcántara

Abstract

In rats, some behavioral changes occurring during pregnancy related to the presence of progesterone may be analyzed in the forced swimming task (FST), which is designed to test the antidepressant profile of drugs. The present study was aimed to analyze in pregnant rats, in rats after delivery, or in rats after receiving progesterone those behavioral changes displayed in the FST. We hypothesize that pregnancy and progesterone will produce antidepressant-like effects in rats forced to swim. Therefore, pregnant rats (14th, 17th, and 20th days), or rats after delivery (3rd, and 7th days) were tested in the FST. Ovariectomized rats receiving saline (0.9%; i.p.), clomipramine (1.25 mg/kg; i.p.), or desipramine (2.14 mg/kg; i.p.) for 28 days were also tested in the FST. In a second series of experiments, ovariectomized rats receiving vehicle or progesterone (0.5 mg/kg; or 2.0 mg/kg; sc.) were tested in the FST. Locomotion was evaluated in the open field test. Results showed that in the FST: 1) pregnancy (P < 0.05), or progesterone (P < 0.05), or desipramine (P < 0.05), reduced immobility by increasing climbing; 2) clomipramine (P < 0.05) reduced immobility by increasing swimming; 3) rats tested after delivery displayed similar behavio...Continue Reading

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