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HOST RESPONSE TO INFECTION |
to secrete cytokines in response to lipopolysaccharides, lipoteichoic acids and peptidoglycans
Department of Microbiology and Immunology, Tohoku University School of Dentistry, Sendai 980-8575 Japan
Corresponding author: Professor H. Takada (e-mail: dent-ht{at}mail.cc.tohoku.ac.jp).
Received 3 Dec. 2001; revised version accepted 14 March 2002.
Abstract
An earlier study reported that human gingival epithelial cells in primary culture and oral epithelial cell lines KB and HSC-2 cells were devoid of membrane CD14 (mCD14) and did not show enhanced production of interleukin (IL)-8 or granulocyte macrophage-colony stimulating factor (GM-CSF) upon stimulation with bacterial cell-surface components such as lipopolysaccharide (LPS), lipoteichoic acid (LTA), peptidoglycan (PGN) and synthetic muramyldipeptide (MDP) even in the presence of serum. The present study demonstrated that after treatment with interferon (IFN)-
for 3 days, these cells secreted IL-8 and GM-CSF in response to the bacterial components. Treatment with IFN- enhanced Toll-like receptor (TLR) 2, TLR4, MD-2 and MyD88 mRNA expression as determined by reverse transcriptase PCR. Anti-TLR2 and anti-TLR4 monoclonal antibodies (MAbs) inhibited the IL-8 production induced by PGN and LTA as well as LPS, respectively, in IFN--primed oral epithelial cells, whereas neither MAb inhibited IL-8 production induced by MDP. These findings suggested that IFN- primed oral epithelial cells to produce cytokines upon stimulation with various bacterial components by up-regulation of the TLR system.
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