期刊
JOURNAL OF LEUKOCYTE BIOLOGY
卷 95, 期 6, 页码 971-981出版社
WILEY
DOI: 10.1189/jlb.0513304
关键词
cathelicidin; Fc gamma R; TLR; innate immunity; infection
资金
- Swedish Research Council (Linneus Grant CERIC) [10350, 11217, 20854, 04342]
- CIDaT
- EC FP7 [201668]
- Torsten och Ragnar Soderberg Foundation
- Swedish Foundation for Strategic Research
- Cancer Foundation
- Distinguished Professor Award from Karolinska Institutet
LL-37/hCAP-18 is the only human member of the cathelicidin family and plays an important role in killing various pathogens, as well as in immune modulation. In this study, we investigated the effect of LL-37 on bacterial phagocytosis by macrophages and demonstrate that LL-37 enhances phagocytosis of IgG-opsonized Gram-negative and Gram-positive bacteria in a dose-and time-dependent manner by dTHP-1 cells. In addition, LL-37 enhanced phagocytosis of nonopsonized Escherichia coli by human macrophages. Consistently, LL-37 elevated the expression of Fc gamma Rs on macrophages but not the complement receptors CD11b and -c. Further studies revealed that the expression of TLR4 and CD14 is also increased on LL-37-treated macrophages. Several lines of evidence indicated that the FPR2/ALX receptor mediated LL-37-induced phagocytosis. However, TLR4 signaling was also coupled to the phagocytic response, as a specific TLR4 antibody significantly suppressed phagocytosis of IgG-opsonized E. coli and nonopsonized E. coli by dTHP-1 cells. Finally, macrophages from Cnlp(-/-) mice exhibited diminished bacterial phagocytosis compared with macrophages from their WT littermates. In conclusion, we demonstrate a novel, immune-modulatory mechanism of LL-37, which may contribute to bacterial clearance.
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