alpha-ketoglutarate

alpha-ketoglutarate (CAS No.: 328-50-7) is a central endogenous α-keto acid and key metabolic intermediate in the tricarboxylic acid cycle, where it functions as a rate-limiting substrate linking carbon and nitrogen metabolism and supporting cellular bioenergetics through ATP and GTP production. Generated via oxidative decarboxylation of isocitrate or deamination of glutamate, alpha-ketoglutarate serves as a principal carbon skeleton for nitrogen assimilation and participates in transamination reactions that lead to the biosynthesis of glutamate and glutamine, thereby contributing to amino acid metabolism, ammonia detoxification, and maintenance of nitrogen balance. It is also implicated in diverse physiological processes including immune cell function, antioxidant defense, protein synthesis, and tissue repair, with experimental evidence suggesting roles in modulating muscle protein turnover and mitigating metabolic stress. In biochemical and pharmacological research, alpha-ketoglutarate is widely utilized to investigate mitochondrial metabolism, metabolic reprogramming, and nitrogen handling pathways, as well as to study enzyme systems such as dehydrogenases and transaminases; it has also been identified as a reversible inhibitor of tyrosinase with activity observed at low millimolar concentrations. Although not approved for therapeutic use, it remains an investigational compound in clinical research settings, including early-stage studies evaluating its metabolic effects in rare disorders. In vitro and in vivo applications typically employ concentration ranges tailored to specific experimental models, supporting its continued use as a versatile tool in metabolic, nutritional, and drug discovery research.