Treatment with progesterone prevented the motor impairment induced by poisoning with seeds of cicada (Dioon spinulosum) in the male rat

Abstract

The chronic consumption of cycad seeds has been associated with neurodegenerative diseases, which are predominant in masculine gender. In Mexico, the cycad seeds (Dioon spinulosum) ared used as a maize substitute and at experimental level produce a motor deficit; probably caused by its neurotoxic compounds. Progesterone could prevent the neurotoxic effects against traumatic brain injury, hypoxia and neuronal death induced by colchicine in the CNS. In addition, progesterone could prevent these neurotoxic effects produced by the chronic administration of cycad seeds (Dioon spinulosum) in rats, a possibility explored in the present study. Male wistar rats were randomly divided in 4 groups: a) a control group received 1 ml purified water (PO) and oil (0.2 ml, s.c.); b) a cycad group received a cycad seed 5g/kg (PO) and oil (0.2 ml, s.c.); c) another group received 1 ml of purified water (PO) and progesterone (3mg/kg, s.c.) and d) the last group received cycad seed and progesterone. All treatments were administered daily during 40 days and the effect was evaluated in behavioral tests (open filed and forced swim) were conducted on 20, 30 and 40 days of treatment. The cycad group decreased the number of squares crossed in the open field whereas, in the forced swim test, rotational behavior was only observed in the group administered with cycad seeds, this effect was prevented by previous progesterone treatment. The vehicle and progesterone administration did not produce the rotational behavior per se. In conclusion, progesterone prevents the motor deficit induced by the chronic consumption of cycad seeds in forced swim rats.