CYP4F8 is a cytochrome P450 monooxygenase with specialized functions in prostaglandin and fatty acid metabolism. The enzyme primarily catalyzes omega-2 and omega-3 hydroxylation of prostaglandin endoperoxides, converting PGH1 and PGH2 to their 19-hydroxy metabolites, which are the predominant prostaglandins in human seminal fluid 1. CYP4F8 also hydroxylates arachidonic acid predominantly at the omega-2 position to form 18R-HETE and can epoxidate polyunsaturated fatty acids including docosahexaenoic and docosapentaenoic acids 12. The enzyme is highly expressed in epithelial tissues including seminal vesicles, epidermis, hair follicles, and various epithelial linings 3. CYP4F8 shows dramatic upregulation in psoriatic skin lesions, with 15-fold increased mRNA expression compared to normal epidermis, suggesting involvement in inflammatory skin conditions 34. Clinical relevance includes associations with methotrexate toxicity in osteosarcoma patients, where genetic variants in CYP4F8 correlate with thrombocyte count changes 5. The enzyme co-localizes with COX-2 and microsomal PGE synthase-1 in tissues, forming an integrated pathway for specialized prostaglandin biosynthesis 64.