Cyclooxygenase enzyme (prostaglandin-endoperoxide synthase; includes COX-1 and COX-2) (COX (COX-1: PTGS1, COX-2: PTGS2))

Cyclooxygenase (COX; prostaglandin G/H synthase, PTGS) enzymes catalyze the rate-limiting step in the biosynthesis of prostaglandins from arachidonic acid, producing prostaglandin H2, the precursor to all prostanoids such as Prostaglandin D2 (PGD2)[1][2]. Two isoforms exist: COX-1 (constitutive) and COX-2 (inducible, inflammation-associated)[1][7]. Dimethyl fumarate, primarily known as an immunomodulatory drug, does not directly bind to COX, but may exert anti-inflammatory effects in part by reducing expression of COX-2 and downstream prostaglandins including PGD2[7]. PGD2, produced from PGH2 by prostaglandin D2 synthase, acts mainly as a modulator of inflammation, with anti-inflammatory roles in the gut, vasculature, and immune system[5][9].

Other names

Prostaglandin G/H synthasePGHSPTGSCOX-1COX-2

NSAIDs: Competitive reversible/irreversible inhibition of COX active site, blocking production of prostaglandin precursors[4][7]. Dimethyl fumarate: Indirect regulation of inflammatory pathways; may decrease COX-2 expression and downstream prostaglandin (e.g., PGD2) production through Nrf2 activation, rather than direct enzyme inhibition (mechanistic studies, not direct binding)[7].