Effect of the antimicrobial peptide LL-37 on Toll-like receptors 2-, 3- and 4-triggered expression of IL-6, IL-8 and CXCL10 in human gingival fibroblasts.

Abstract:

:The antimicrobial peptide LL-37 is known to have a potent LPS-neutralizing activity in monocytes and macrophages. Recently, LL-37 in gingival crevicular fluids is suggested to be the major protective factor preventing infection of periodontogenic pathogens. In this study, we tried to address the effect of LL-37 on proinflammatory responses of human gingival fibroblasts (HGFs) stimulated with Toll-like receptor (TLR)-stimulant microbial compounds. LL-37 potently suppressed LPS-induced gene expression of IL6, IL8 and CXCL10 and intracellular signaling events, degradation of IRAK-1 and IkappaBalpha and phosphorylation of p38 MAPK and IRF3, indicating that the LPS-neutralizing activity is also exerted in HGFs. LL-37 also suppressed the expression of IL6, IL8 and CXCL10 induced by the TLR3 ligand poly(I:C). LL-37 modestly attenuated the expression of IL6 and IL8 induced by the TLR2/TLR1 ligand Pam(3)CSK(4), but did not affect the expression induced by the TLR2/TLR6 ligand MALP-2. Interestingly, LL-37 rather upregulated the expression of IL6, IL8 and CXCL10 induced by another TLR2/TLR6 ligand FSL-1. Thus, the regulatory effect of LL-37 is differently exerted towards proinflammatory responses of HGFs induced by different microbial stimuli, which may lead to unbalanced proinflammatory responses of the gingival tissue to infection of oral microbes.

journal_name

Cell Immunol

journal_title

Cellular immunology

authors

Into T,Inomata M,Shibata K,Murakami Y

doi

10.1016/j.cellimm.2010.05.005

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

104-9

issue

1

eissn

0008-8749

issn

1090-2163

pii

S0008-8749(10)00126-7

journal_volume

264

pub_type

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