Abstract:
:Fibroblasts are important to host defence and immunity, can also as initiators of inflammation as well. As the endogenous "braking signal", Lipoxins can regulate anti-inflammation and the resolution of inflammation. We investigated the effect of lipoxinA(4) on the expression of cyclooxygenase-2 in lipopolysaccharide-stimulated lung fibroblasts. We demonstrated that the expression of cyclooxygenase-2 protein was significantly increased and peaked initially at 6 hours, with a second increase, with maximal levels occurring 24 hours after lipopolysaccharide challenge. ProstaglandinE(2) levels also peaked at 6 hours, and prostaglandinD(2) levels were increased at both 6 and 24 hours. Exogenous lipoxinA(4) inhibited the first peak of cyclooxygenase-2 expression as well as the production of prostaglandinE(2) induced by lipopolysaccharide in a dose-dependent manner. In contrast, exogenous lipoxinA(4) increased the second peak of cyclooxygenase-2 expression as well as the production of prostaglandinD(2) induced by lipopolysaccharide in a dose-dependent manner. LipoxinA(4) receptor mRNA expression was markedly stimulated by lipopolysaccharide but inhibited by lipoxinA(4). We present evidence for a novel biphasic role of lipoxinA(4) on the expression of cyclooxygenase-2 in lipopolysaccharide-stimulated lung fibroblasts, whereby LXA(4) has an anti-inflammatory and proresolving activity in lung fibroblasts following LPS stimulation.
journal_name
Mediators Inflammjournal_title
Mediators of inflammationauthors
Zheng S,Wang Q,He Q,Song X,Ye D,Gao F,Jin S,Lian Qdoi
10.1155/2011/745340subject
Has Abstractpub_date
2011-01-01 00:00:00pages
745340eissn
0962-9351issn
1466-1861journal_volume
2011pub_type
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