Recent Updates on Alzheimer's Disease: Pathogenesis, Pathophysiology, Molecular Approaches and Natural Bioactive Compounds Used in Contemporary Time to Alleviate Disease

Alzheimer's disease (AD), characterised by gradual memory loss and neurodegeneration, is an important risk to global health. Despite the recent advances in the field of neuroscience, the complex biological mechanisms underlying the aetiology and pathology of AD have not been elucidated yet. The development of amyloid-beta plaques, hyperphosphorylation of tau protein, oxidative stress, and neuroinflammation have been identified as important components. The genesis of AD has been illuminated by advances in molecular techniques, which have shown the contributions of environmental, genetic, and epigenetic variables. Ongoing research is focused on the potential of bioactive compounds as therapeutic agents. Quercetin, epigallocatechin gallate, huperzine A, ginsenosides, omega-3 fatty acids, vitamin E, zinc, bacosides from brahmi, and withanolide A from ashwagandha are among the compounds that have demonstrated encouraging effects in modifying disease pathways. These bioactive substances demonstrate their potential for symptomatic relief by providing neuroprotective, antioxidant, anti-inflammatory, and cognitive-enhancing properties. The present review presents the recent findings on AD pathogenesis, molecular mechanisms, and the impact of natural compounds, offering a comprehensive perspective on current and emerging strategies for managing this debilitating condition.