期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 111, 期 40, 页码 14530-14535出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1410851111
关键词
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资金
- National Institutes of Health (NIH) [HL119587]
- NIH/National Heart, Lung, and Blood Institute Program of Excellence in Nanotechnology Award [HHSN268201000045C/BAA-HV-10-08]
- NIH/NHLBI [R01 HL107497, HL075662]
- NIH [HL106173, HL116186]
- Deutsche Forschungsgemeinschaft [BA 2258/2-1]
- European Commission
- Deutsches Zentrum fur Herz-Kreislauf-Forschung-German Centre for Cardiovascular Research
- BMBF German Ministry of Education and Research
- [MEDIA-261409]
Imbalances between proinflammatory and proresolving mediators can lead to chronic inflammatory diseases. The balance of arachidonic acid-derived mediators in leukocytes is thought to be achieved through intracellular localization of 5-lipoxygenase (5-LOX):nuclear 5-LOX favors the biosynthesis of proinflammatory leukotriene B-4 (LTB4), whereas, in theory, cytoplasmic 5-LOX could favor the biosynthesis of proresolving lipoxin A(4) (LXA(4)). This balance is shifted in favor of LXA(4) by resolvin D1 (RvD1), a specialized proresolving mediator derived from docosahexaenoic acid, but the mechanism is not known. Here we report a new pathway through which RvD1 promotes nuclear exclusion of 5-LOX and thereby suppresses LTB4 and enhances LXA(4) in macrophages. RvD1, by activating its receptor formyl peptide receptor2/lipoxin A(4) receptor, suppresses cytosolic calcium and decreases activation of the calcium-sensitive kinase calcium-calmodulin-dependent protein kinase II (CaMKII). CaMKII inhibition suppresses activation P38 and mitogen-activated protein kinase-activated protein kinase 2 kinases, which reduces Ser271 phosphorylation of 5-LOX and shifts 5-LOX from the nucleus to the cytoplasm. As such, RvD1's ability to decrease nuclear 5-LOX and the LTB4:LXA(4) ratio in vitro and in vivo was mimicked by macrophages lacking CaMKII or expressing S271A-5-LOX. These findings provide mechanistic insight into how a specialized proresolving mediator from the docosahexaenoic acid pathway shifts the balance toward resolution in the arachidonic acid pathway. Knowledge of this-mechanism may provide new strategies for promoting inflammation resolution in chronic inflammatory diseases.
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