Differential regulation of monocytic expression of leukotriene and lipoxin receptors.
Prostaglandins Other Lipid Mediat
; 121(Pt A): 138-43, 2015 Sep.
Article
in En
| MEDLINE
| ID: mdl-26248046
ABSTRACT
INTRODUCTION:
Lipoxygenase pathway yields both pro-inflammatory leukotrienes and pro-resolving lipoxins. The aim of the present study was to determine the effects of T-lymphocytes and pro-inflammatory stimuli on the expression levels of the lipoxin FPR2/ALX receptor, and the leukotriene BLT1 receptor in monocytes and macrophages, and to characterize LXA4-induced effects on pro-inflammatory mediators.METHODS:
Human macrophages were co-cultured with activated CD4(+) cells. THP-1 cells were stimulated with different cytokines, LXA4 and supernatant from activated CD4(+) cells. mRNA was extracted for qPCR experiments and protein was analyzed by flow cytometry.RESULTS:
Co-culture of macrophages with activated CD4(+) cells or their supernatants up-regulated macrophage FPR2/ALX expression but did not alter BLT1 receptor expression. Monocyte stimulation with IFN-γ up-regulated FPR2/ALX mRNA and protein levels, whereas BLT1 mRNA was down-regulated. Finally, LXA4 decreased mRNA levels of MMP-9, CXCL16, IL-1ß, and IL-8 in THP-1 cells.CONCLUSION:
The present study shows that pro-inflammatory stimuli lead to FPR2/ALX expression. LXA4 induces an anti-inflammatory response, which could participate in the resolution of inflammation.Key words
Full text:
1
Database:
MEDLINE
Main subject:
Monocytes
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Down-Regulation
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Up-Regulation
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Receptors, Leukotriene B4
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Receptors, Lipoxin
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Receptors, Formyl Peptide
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Adaptor Proteins, Signal Transducing
Limits:
Humans
Language:
En
Year:
2015
Type:
Article