Abstract
Neurodevelopmental disorders (NDDs), including autism spectrum disorder (ASD), impose significant burdens on society due to their genetic and clinical complexity. We explored the therapeutic potential of Glycyrrhiza glabra (licorice) extract in a prenatal valproic acid (VPA) model of ASD. Neurobehavioral parameters encompassing social interaction, locomotor activity, repetitive behaviour, anxiety-related behaviour, and learning and memory were assessed in Wistar rat offspring. Licorice extract administration at 150 mg/kg and 300 mg/kg was initiated from postnatal day 21, emulating the developmental stage of early childhood. The study incorporated a controlled group, a VPA-induced ASD group, and groups treated with two different doses of licorice extract and Risperidone.Results revealed that licorice extract, particularly at 300 mg/kg, exhibited remarkable potential in restoring social interaction deficits, enhancing locomotor activity, attenuating repetitive behaviour, and mitigating anxiety-related behaviour-like behaviours. Furthermore, licorice extract displayed cognitive benefits, as evidenced by the discrimination index enhancement in object recognition memory. Importantly, licorice extract demonstrated modulatory effects on neuroinflammation and oxidative stress, evident through suppressed interleukin-6 (IL-6) and tumour necrosis factor-α (TNF-α) levels, as well as reduced thiobarbaturic acid reactive substances (TBARS) in the brain.These findings underscore the promising neuroprotective properties of Glycyrrhiza glabra extract against prenatal VPA-induced ASD-like behaviours. The elucidation of licorice's multifaceted impact on behaviour, cognition, and neurobiochemical markers offers a potential avenue for future therapeutic interventions for ASD, meriting further investigation in clinical contexts. This study contributes to the expanding knowledge of natural compounds in ameliorating complex neurodevelopmental disorders and highlights the necessity of multi-faceted approaches to address their intricate etiology and manifestation.
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