Impact of 2 Doses of Clorgyline on the Rat Preimplantation Embryo Development and the Monoamine Levels in Urine

Abstract

We have evaluated the impact of chronic administration of clorgyline, a potent monoamine oxidase A inhibitor and a former antidepressant, on the preimplantation embryo development in Wistar rats. Females were injected intraperitoneally daily for 30 days with saline (control animals), or with a low-dose clorgyline (LDC, 0.1 mg/kg per d) or with a high-dose clorgyline (HDC, 1 mg/kg per d). Embryos were isolated on day 5 of pregnancy and urine was collected by puncture of the urinary bladder. The number of embryos per female did not differ between experimental groups and control, but we have recorded a decreased number of embryos in HDC group compared to LDC (P < .05). We have found that LDC significantly reduced the presence of healthy embryos and increased the presence of the degenerated embryos (P < .001). The administration of the LDC resulted in the lowest cell number in blastocysts. We have observed significantly increased serotonin levels in HDC group compared to both control (P < .05) and LDC animals (P < .01). Norepinephrine (NE) levels in both experimental groups were significantly elevated compared to controls. Dopamine levels did not differ between groups (P > .05). We speculate that lesser negative effect of HDC compared to LDC on the preimplantation embryo development could be the consequence of the lower NE levels and/or elevated serotonin levels. Potential mechanisms mediating clorgyline-induced impaired preimplantation embryo development are proposed.

Keywords

MAO-A inhibitor noradrenalin norepinephrine dopamine serotonin catecholamine

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