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Leukotrienes and Lipoxins: Structures, Biosynthesis, and Biological Effects

Samuelsson, Bengt, Dahlén, Sven-Erik, Lindgren, Jan Åke, Rouzer, Carol A., Serhan, Charles N.·1987·Science

Abstract

Arachidonic acid is released from membrane phospholipids upon cell stimulation (for example, by immune complexes and calcium ionophores) and converted to leukotrienes by a 5-lipoxygenase that also has leukotriene A 4 synthetase activity. Leukotriene A 4, an unstable epoxide, is hydrolyzed to leukotriene B 4 or conjugated with glutathione to yield leukotriene C 4 and its metabolites, leukotriene D 4 and leukotriene E 4. The leukotrienes participate in host defense reactions and pathophysiological conditions such as immediate hypersensitivity and inflammation. Recent studies also suggest a neuroendocrine role for leukotriene C 4 in luteinizing hormone secretion. Lipoxins are formed by the action of 5- and 15-lipoxygenases on arachidonic acid. Lipoxin A causes contraction of guinea pig lung strips and dilation of the microvasculature. Both lipoxin A and B inhibit natural killer cell cytotoxicity. Thus, the multiple interaction of lipoxygenases generates compounds that can regulate specific cellular responses of importance in inflammation and immunity.

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Authors
Samuelsson, B., Dahlén, S.-E., Lindgren, J. Å., Rouzer, C. A., & Serhan, C. N.
Venue
Science
Published
1987-09-04
Volume
237
Issue
4819
Pages
1171-1176
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2024176341
Cited by
2,233
References
0
FWCI
47.47
Type
journal article
Language
en
Open access
closed

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