Kubo Y, Fukuishi N, Yoshioka M, Kawasoe Y, Iriguchi S, Imajo N, Yasui Y, Matsui N, Akagi M. Bacterial components regulate the expression of Toll-like receptor 4 on human mast cells.
Inflamm Res 2007;
56:70-5. [PMID:
17431743 DOI:
10.1007/s00011-006-6064-4]
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Abstract
OBJECTIVES AND DESIGN
The aim of this study was to investigate whether the exposure of mast cells (MCs) to bacterial components affects the expression of Toll-like receptor (TLR) 4, and to elucidate the behavior of MCs during the early response to infection.
MATERIALS
Two human MC lines, HMC-1 and LAD2, were employed. Messenger RNA expression was observed by RT and real-time PCR. TLR4 expression was determined by Western blotting. TNF-alpha secretion was analyzed with ELISA. The degranulation ratio was measured with betahexosaminidase assay.
RESULTS
Although bacterial components increased TLR4 mRNA, only lipopolysaccharide (LPS) augmented the TLR4 protein expression. LAD2 pre-treated with LPS for 8 h resulted in 2-fold increased TNF-alpha secretion on LPS restimulation.
CONCLUSION
These results suggest that the exposure of MCs to LPS may reinforce the innate immune system due to up-regulation of MC TLR4, followed by increased TNF-alpha release.
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