PTGES2 (prostaglandin E synthase 2) is an isomerase that catalyzes the conversion of prostaglandin H2 (PGH2) to prostaglandin E2 (PGE2), though its biological function remains debated 1. The enzyme exhibits dual functionality: in vitro studies demonstrate PGE2 synthesis activity, while in vivo evidence suggests it may form complexes with glutathione and heme to catalyze PGH2 degradation rather than PGE2 production 1. PTGES2 plays critical roles in metabolic regulation, with its expression inversely correlating with insulin sensitivity in humans 2. The protein requires farnesylation for proper endoplasmic reticulum localization and optimal PGE2 production 3. Disease relevance includes potential roles in diabetic kidney disease, where mPGES-2 knockout attenuates renal lipotoxicity and fibrosis 4, and basal cell carcinoma, where PTGES2 has been identified as a potential biomarker and therapeutic target 5. Genetic variants such as the Arg298His polymorphism are associated with lower diabetes risk and improved insulin sensitivity parameters 6. The enzyme's regulation involves m6A-mediated mRNA decay in brown adipose tissue, affecting systemic metabolism 27.