Resumo

GOMEZ-CHAVARIN, Margarita et al. Developmental effects of rotenone exposure on the rat nigro-striatal dopaminergic system. Salud Ment [online]. 2013, vol.36, n.1, pp.1-8. ISSN 0185-3325.

Rotenone is a pesticide used in Mexico, despite the experimental evidence showing dopaminergic neurons degeneration induced by this compound, which may lead to a psychomotor impairment. However, the possible effects of rotenone on the offspring when they are indirectly exposed through their mothers are still unknown. In this study rotenone was administered to female rats during pregnancy and nursing, in order to assess its effects on the offspring's dopaminergic neurons in the substantia nigra, as well as on motor coordination at 30 or 60 postnatal days. Six groups of pregnant Wistar rats were used: an intact control group, a vehicle group injected with the rotenone solvent, and four groups injected subcutaneously with the following doses of rotenone: 0.2, 0.4, 0.6, and 1 mg/kg/day. In a parallel experiment, the offspring of other groups of dams treated with rotenone 1 mg/kg/day, or controls vehicle-treated, were used to evaluate motor coordination at 30 and 60 postnatal days. Rotenone treated dams showed a significant lower amount of dopaminergic neurons in the substantia nigra, but only with the 1 mg/kg dose. This effect was also observed in the offspring but at all doses of rotenone tested, either at 30 or 60 postnatal days. Furthermore, the offspring of rotenone exposed dams significantly increased the time in which they accomplished the motor coordination test, compared to the offspring of control dams. These data indicate that rotenone is able to damage the dopaminergic neurons of the offspring though their mothers. This effect requires lower rotenone doses than in adult rats. The reduced number of dopaminergic neurons at early stages of life enhances the risk of developing disorders related to the brains' dopaminergic system.

Palavras-chave : Rotenone; Parkinson disease; tyrosine hydroxilase; substantia nigra; attention deficit hyperactivity disorder; and motor coordination.

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