Liu Caiqiong, Tazzeo Tracy, Guy Alexandre, Durand Thierry, Janssen Luke J
Firestone Institute for Respiratory Health, St. Joseph's Hospital and the Department of Medicine, McMaster University, L-314, St. Joseph's Hospital, 40 Charlton Avenue East, Hamilton, Ontario, Canada L8N 3Z5.
Prostaglandins Leukot Essent Fatty Acids. 2007 Jan;76(1):57-64. doi: 10.1016/j.plefa.2006.08.005. Epub 2006 Oct 16.
We examined the responses to various isoprostane derivatives in bovine/human airway and pulmonary arteries. All biological activity of 15-F(2t)-IsoP was lost in its two major metabolites (15-keto-15-F(2t)-IsoP and 13,14-dihydro-15-keto-15-F(2t)-IsoP). We also examined the effects of several metabolites of 15-F(2t)-IsoP synthesized within our own laboratory-both epimers of 2,3-dinor-15-F(2t)-IsoP and of 2,3-dinor-5,6-dihydro-15-F(2t)-IsoP, as well as 20-carboxy-2,3,4,5-tetranor-15 oxo-5,6,13,14-tetrahydro-15-F(2t)-isoP)-finding none of these to have any substantial excitatory effect. Finally, several plant-derived isoprostanes ("phytoprostanes") synthesized within our laboratory elicited little or no excitatory response in these three pulmonary smooth muscle preparations. We conclude that, although isoprostane exhibit powerful constrictor effects on airway and pulmonary vascular smooth muscles, metabolic processing of those isoprostanes essentially abolishes those biological actions; also, the phytoprostanes lack any appreciable pharmacological activity on those smooth muscle preparations.
