Basic Science and Pathogenesis

Memory impairment is a debilitating condition affecting millions worldwide, particularly the elderly. Alzheimer's disease, characterized by amyloid plaques and neurofibrillary tangles, is a major cause of dementia. Scopolamine, a muscarinic acetylcholine receptor antagonist, is commonly used to induce memory deficits in animal models. Curcumin, a natural polyphenol found in turmeric, has shown promise in improving cognitive function. In this study, we investigated the neuroprotective effects of nanocurcumin against scopolamine-induced memory impairment and its underlying mechanisms. The PI3K/Akt/GSK-3β signaling pathway plays a crucial role in neuronal survival and memory.

Adult male mice were randomly assigned to different groups. Memory function was assessed using novel object recognition and Y-maze tasks. Western blot analysis was used to evaluate the expression levels of phosphorylated Akt and GSK-3β in the hippocampus.

Scopolamine administration induced memory impairment, while pretreatment with nanocurcumin (2.5 mg/kg) prevented this deficit. Furthermore, scopolamine significantly decreased the ratio of phosphorylated to total Akt and reduced the phosphorylation of GSK-3β. Nanocurcumin treatment significantly reversed these effects. In contrast, natural curcumin at the same dose did not show any protective effects.

Our findings suggest that nanocurcumin can effectively ameliorate scopolamine-induced memory impairment by activating the Akt/GSK-3β signaling pathway in the hippocampus. This study highlights the potential of nanocurcumin as a therapeutic agent for cognitive disorders.