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8-iso-13,14-dihydro-15-keto Prostaglandin F2α (8-iso-13,14-dihydro-15-keto PGF2α) is a metabolite of the isoprostane, 8-isoprostane (8-iso PGF2α), in rabbits, monkeys and humans.1 8-iso PGF2α is a PG-like product of non-specific lipid peroxidation.2 In both humans and monkeys, exogenously infused 8-isoprostane is converted primarily to metabolites having 2 or 4 carbon atoms removed from the top side chain by β-oxidation.1 A similar pattern is observed when tritiated 8-isoprostane is infused into rabbits.3 Early in the infusion (within 10 minutes) 8-iso-13,14-dihydro-15-keto PGF2α was a significant component of the metabolite profile, which was comprised mostly of dinor 8-isoprostane metabolites. 8-iso-13,14-dihydro-15-keto PGF2α weakly inhibits the U-46619 or collagen-induced aggregation of human platelets, although a number of the E-series isoprostanes are much more potent in this assay.4
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1
Chiabrando, C., Valagussa, A., Rivalta, C., et al. Identification and measurement of endogenous β-oxidation metabolites of 8-epi-prostaglandin F2a. J Biol Chem 274 1313-1319 (1999).
2
Morrow, J.D., Hill, K.E., Burk, R.F., et al. A series of prostaglandin F2-like compounds are produced in vivo in humans by a non-cyclooxygenase, free radical-catalyzed mechanism. Proc Natl Acad Sci USA 87 9383-9387 (1990).
3
Basu, S. Metabolism of 8-iso-prostaglandin F2α FEBS Lett 428, 32-36 (1998).
4
Cranshaw, J.H., Evans, T.W., Mitchell, J.A. Charcterization of the effects of isoprostanes on platelet aggregation in human whole blood. Br J Pharmacol 132 1699-1706 (2001).
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