Abstract
There is growing global number of persons affected with autism, and teratogenic influences arising from several epigenetic factors have been implicated. This study aimed to determine the effect of prenatal supplementation of extract of Curcuma longa on valproic acid-induced model of autism in Sprague-Dawley rats. Thirty pregnant Sprague-Dawley rats divided into five groups (n=6) were used. Valproic acid (500 mg/kg body weight) induced autism on gestation day 12.5. The groups were designated as control, valproic acid, and valproic acid with 5, 10 and 20 mg/kg body weights Curcuma longa respectively, (Curcuma longa was administered from day 1-21 of gestation). On postnatal day 21, five male pups were randomly selected from each group, and neurobehavioral tests were performed until postnatal day 28. The pups were sacrificed on postnatal day 28, and the hippocampus was dissected for histology and biochemical assays. Treated groups showed improvement in anxiety and social behaviour. The histological sections showed fewer atrophied cells, reduced degree of chromatolysis with better delineation of the cells within the pyramidal layer compared with valproic acid group. Dopamine, lL-6 and TGF β1 levels were not significantly different from control. Malondialdehyde and glutathione values of the treated groups were significantly different from valproic acid groups. Superoxide dismutase and catalase showed no significant difference when treated groups were compared to valproic acid group except the medium dose for catalase. This study shows that prenatal supplementation with Curcuma longa is a potential ameliorative agent against teratogenic epigenetic agents that may lead to autism.
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