Exp Mol Med.  2009 May;41(5):325-333. 10.3858/emm.2009.41.5.036.

LL-37 inhibits serum amyloid A-induced IL-8 production in human neutrophils

  • 1Department of Biochemistry, College of Medicine, Dong-A University, Busan 602-714, Korea. yoesik@donga.ac.kr


Serum amyloid A (SAA) has been regarded as an important mediator of inflammatory responses. The effect of several formyl peptide receptor-like 1 (FPRL1) ligands on the production of IL-8 by SAA was investigated in human neutrophils. Among the ligands tested, LL-37 was found to specifically inhibit SAA-induced IL-8 production in transcriptional and post-transcriptional levels. Since SAA stimulated IL-8 production via ERK and p38 MAPK in human neutrophils, we tested the effect of LL-37 on SAA induction for these two MAPKs. LL-37 caused a dramatic inhibition of ERK and p38 MAPK activity, which is induced by SAA. LL-37 was also found to inhibit SAA-stimulated neutrophil chemotactic migration. Further, the LL-37-induced inhibitory effect was mediated by FPRL1. Our findings indicate that LL-37 is expected to be useful in the inhibition of SAA signaling and for the development of drugs against SAA-related inflammatory diseases.


CAP18 lipopolysaccharide-binding protein; FPR2 protein, human; interleukin-8; mitogen-activated protein kinases; neutrophils; serum amyloid A protein
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