Résumé
Background: This study explored the efficacy of kolaviron—a biflavonoid complex isolatedfrom the seeds of Garcinia kola—in protecting against cuprizone (CPZ)-induced demyelination inboth the prefrontal cortex and the hippocampus of Wistar rats.Methodology: Thirty rats were treated to receive 0.5 mL phosphate-buffered saline (groupA, control), 0.5 mL corn oil (group B), 0.2% CPZ (group C), for 6 weeks, 0.2% CPZ for 3 weeks andthen 200 mg/kg of Kv for 3 weeks (group D), or 200 mg/kg of Kv for 3 weeks followed by 0.2%CPZ for 3 weeks (group E). Rats were assessed for exploratory functions and anxiety-like behaviourbefore being euthanised and perfused transcardially with 4% paraformaldehyde. Prefrontal andhippocampal thin sections were stained in hematoxylin and eosin and cresyl fast violet stains.Results: CPZ-induced demyelination resulted in behavioural impairment as seen byreduced exploratory activities, rearing behaviour, stretch attend posture, center square entry,and anxiogenic characteristics. Degenerative changes including pyknosis, karyorrhexis, neuronalhypertrophy, and reduced Nissl integrity were also seen. Animals treated with Kv showedsignificant improvement in behavioural outcomes and a comparatively normal cytoarchitecturalprofile.Conclusion: Kv provides protective roles against CPZ-induced neurotoxicity throughprevention of ribosomal protein degradation.
Résumé
Cuprizone is a neurotoxin with copper-chelating ability used in animal model of multiple sclerosis in which oxidative stress has been documented as one of the cascade in the pathogenesis. Moringa oleifera is a phytomedicinal plant with antioxidant and neuroprotective properties. This study aimed at evaluating the ameliorative capability of M. oleifera in cuprizone-induced behavioral and histopathological alterations in the prefrontal cortex and hippocampus of Wistar rats. Four groups of rats were treated with normal saline, cuprizone, M. oleifera and a combination of M. oleifera and cuprizone, for five weeks. The rats were subjected to Morris water maze and Y-maze to assess long and short-term memory respectively. The animals were sacrificed, and brain tissues were removed for histochemical and enzyme lysate immunosorbent assay for catalase, superoxide dismutase, and nitric oxide. Cuprizone significantly induced oxidative and nitrosative stress coupled with memory decline and cortico-hippocampal neuronal deficits; however, administration of M. oleifera significantly reversed the neuropathological deficits induced by cuprizone.