1.14.99.1 arachidonate + 2 O2 - 1.14.99.1 arachidonate + AH2 + 2 O2 - 1.14.99.1 arachidonate + AH2 + O2 - 1.14.99.1 arachidonate + reduced acceptor + O2 - 1.14.99.1 additional information first step in prostaglandin synthesis 1.14.99.1 additional information enzyme has a central position in prostanoic metabolism: first step in formation of prostaglandins and thromboxanes, the conversion of arachidonic acid to prostaglandin endoperoxides G and H 1.14.99.1 additional information the expression of PGHS-2 may be involved in inhibiting progesterone production 1.14.99.1 additional information prostaglandin synthesis within the fetal central nervous system is critical for the the modulation of hypotension-induced fetal ACTH secretion involving PGHS-2, overview 1.14.99.1 additional information dopamine precursor L-dihydroxyphenylalanine, i.e. L-DOPA, and metabolites dihydroxyphenylacetic acid, homovanillic acid, and 3-methoxytyramine may serve as substrates for prostaglandin H synthase-catalyzed bioactivation to free radical intermediates 1.14.99.1 additional information PGHS-2 also shows cyclooxygenase activity 1.14.99.1 additional information activity with arachidonate in presence of glutathione leads to formation of malondialdehyde and (15S)-8-iso-prostaglandin F2alpha 1.14.99.1 prostaglandin G2 + AH2 -