Abstract:
:Although leukotriene B4 (LTB4) has been reported to stimulate monocytes and neutrophils, its role on dendritic cell (DC) activity has not been examined. Here, we investigated the expression of LTB4 receptor and the effect of LTB4 on human DC chemotaxis. We analyzed LTB4 receptors, BLT1 and BLT2, by using RT-PCR. DCs express BLT2 but not BLT1 mRNA. DCs were chemotactically migrated to LTB4. LTB4-induced DC chemotaxis was completely inhibited by pertussis toxin, indicating the role of Gi proteins. LTB4 induced mitogen activated protein kinase activation and Akt activation. LTB4-induced DC chemotaxis was mediated by extracellular signal-regulated protein kinase and phosphoinositide 3-kinase but not by p38 kinase. BLT2-selevite antagonist, LY255283, almost completely inhibited DC chemotaxis induced by LTB4 but not by Trp-Lys-Tyr-Met-Val-D-Met. Thus human myeloid DCs express functional BLT2 but not BLT1, suggesting a physiological role of LTB4 and BLT2 in regulating DC trafficking during induction of immune responses.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Shin EH,Lee HY,Bae YSdoi
10.1016/j.bbrc.2006.07.084subject
Has Abstractpub_date
2006-09-22 00:00:00pages
606-11issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(06)01651-2journal_volume
348pub_type
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