Abstract:
:Incubation of lipoxin A4 (LXA4) either with human leukocytes or with rat liver microsomes in the presence of NADPH very selectively led to a more polar metabolite retaining the conjugated tetraenic structure of LXA4. Lipoxin B4 (LXB4) underwent a very similar metabolism into a more polar metabolite, whereas the all-trans isomers of LXA4 and LXB4 were selectively transformed by the same biological systems into metabolites derived from the reduction of one of the double bonds of the conjugated tetraene moiety of the starting compounds. Microsomal metabolism of LXA4 and LXB4 was NADPH-dependent and strongly inhibited by CO and miconazole indicating the involvement of cytochrome P-450 monooxygenase enzymes. Striking similarities between the metabolism of lipoxins and that of leukotriene B4 (LTB4) suggest that LXA4 and LXB4 are mainly hydroxylated, on omega or omega-I position, by human leukocytes and rat and human liver microsomes, whereas their all-trans isomers are mainly reduced into conjugated trienic compounds.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Boucher JL,Delaforge M,Mansuy Ddoi
10.1016/0006-291x(91)91958-fsubject
Has Abstractpub_date
1991-05-31 00:00:00pages
134-9issue
1eissn
0006-291Xissn
1090-2104pii
0006-291X(91)91958-Fjournal_volume
177pub_type
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