Harnessing microbial factories for withaferin-a: the future of plant-based oncotherapeutics

Withania somnifera (Ashwagandha), a member of the Solanaceae family, produces bioactive metabolites known as withanolides, predominantly synthesized in its leaves and roots. Among these, Withaferin-A is a major pharmacologically active compound with demonstrated efficacy across diverse preclinical models. It exhibits anti-cancer, anti-diabetic, anti-viral (including COVID-19), and neuroprotective activities through modulation of oncoproteins and cell signalling pathways. Notably, its specificity toward tumour-associated antigens and immune regulators positions Withaferin-A as a potential alternative to conventional therapies such as chemotherapy and radiotherapy, which often present severe side effects and resistance issues. This review critically explores the biosynthetic routes of Withaferin-A, encompassing chemical synthesis, natural extraction, and microbial production, while also emphasizing strategies for yield optimization through biotechnological interventions. Furthermore, we discuss the bioavailability and pharmacokinetic challenges of Withaferin-A, highlighting formulation and delivery strategies aimed at enhancing its clinical applicability. Overall, the review outlines its translational potential and provides a roadmap for future therapeutic and clinical integration.