| Lipoxin A. Stereochemistry and biosynthesis. | |
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MedLine Citation:
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PMID: 3097008 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Lipoxin A (LXA) was prepared by incubation of either (15S)-15-hydroxy-5,8,11-cis-13-trans-eicosatetraenoic acid (15-HETE) or (15S)-15-hydroperoxy-5,8,11-cis-13-trans-eicosatetraenoic (15-HPETE) with human leukocytes stimulated by either the ionophore A23187 or the chemotactic peptide fMet-Leu-Phe. Comparison with four trihydroxyeicosatetraenoic acids prepared by total synthesis showed that biologically derived LXA is 5S,6R,15S)-5,6,15-trihydroxy-7,9,13-trans-11-cis-eicosatetraenoic acid. Three isomers of LXA were also identified in extracts of leukocytes utilizing an improved isolation procedure. These were (5S,6S,15S)-5,6,15-trihydroxy-7,9,13-trans-11-cis-eicosatetraenoic acid (6S-LXA), (5S,6R,15S)-5,6,15-trihydroxy-7,9,11,13-trans-eicosatetraenoic acid (11-trans-LXA), and (5S,6S,15S)-5,6,15-trihydroxy-7,9,11,13-trans-eicosatetraenoic acid (6S-11-trans-LXA). 18O2-labeling studies indicated that formation of LXA and its isomers occurred with incorporation of 18O at their C-5 but not C-6 positions. These results suggest that 15-hydroxy-5,6-epoxy-7,9,13-trans-11-cis-eicosatetraenoic acid or its equivalent may serve as one intermediate in the biosynthesis of LXA and 6S-LXA. When added to guinea pig lung strips LXA provoked contractions which were slow in onset and long lasting. In addition, dose response studies showed that biologically derived LXA and synthetic LXA were indistinguishable in this bioassay whereas synthetic 6S-LXA and biologically derived 6S-LXA did not share this activity. Taken together, these results suggest that activated leukocytes utilize exogenous 15-HETE to generate lipoxins which in turn can modulate cellular responses. |
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Authors:
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C N Serhan; K C Nicolaou; S E Webber; C A Veale; S E Dahlén; T J Puustinen; B Samuelsson |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of biological chemistry Volume: 261 ISSN: 0021-9258 ISO Abbreviation: J. Biol. Chem. Publication Date: 1986 Dec |
Date Detail:
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Created Date: 1987-01-12 Completed Date: 1987-01-12 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 2985121R Medline TA: J Biol Chem Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 16340-5 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Calcimycin
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pharmacology Chromatography, High Pressure Liquid Humans Hydroxyeicosatetraenoic Acids / biosynthesis, blood*, isolation & purification Kinetics Leukocytes / drug effects, metabolism*, physiology Lipoxins* Mass Spectrometry N-Formylmethionine Leucyl-Phenylalanine / pharmacology Spectrophotometry, Ultraviolet Stereoisomerism |
| Chemical | |
Reg. No./Substance:
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0/Hydroxyeicosatetraenoic Acids; 0/Lipoxins; 0/lipoxin A4; 52665-69-7/Calcimycin; 59880-97-6/N-Formylmethionine Leucyl-Phenylalanine |
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