Differential expression of TLR-2 and TLR-4 in the epithelial cells in oral lichen planus

Srihari B. Janardhanam, Sivaraman Prakasam, Venkatesh T. Swaminathan, Krithika N. Kodumudi, Susan L. Zunt, Mythily Srinivasan

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Objective: Oral lichen planus (OLP) is a chronic inflammatory condition of the mucosa mediated by a complex signalling network between the keratinocytes and the sub-epithelial lymphocytes. Since OLP occurs in constantly renewing epithelium continuously exposed to commensals, we hypothesised that the epithelial cell microflora interactions may mediate the persistent inflammation. By virtue of their ability to respond to most oral commensal microorganisms, the toll like receptor-2 (TLR-2) and TLR-4 are the most widely investigated receptors in oral diseases. The overall objective of this study was to investigate the role of TLR-2 and TLR-4 in OLP. Design: Systemically healthy OLP and control subjects were recruited after obtaining the institutional review board approval. Expression of TLR-2 and TLR-4 proteins and transcripts in the tissue epithelium and in the epithelial cells isolated from saliva were determined by immunohistochemistry and quantitative real-time polymerase chain reaction respectively. Results: The tissue epithelium and the salivary epithelial cells expressed reduced TLR-2 and increased TLR-4 proteins and transcripts in OLP. The salivary epithelial cells from OLP subjects secreted elevated IL-12. However, upon stimulation with bacterial lipopolysaccharide the epithelial cells from OLP exhibited a mixed Th1 (IL-12) and Th2 (IL-4) response. Presence of dexamethasone significantly reduced inflammatory cytokines in the in vitro stimulated cultures of salivary epithelial cells from OLP subjects. Conclusion: Collectively, our data support a critical role for the host-microbial interactions in the OLP pathogenesis. The potential use of exfoliated oral epithelial cells in saliva for functional analysis exponentially increases its value as biological specimen for clinical research.

Original languageEnglish (US)
Pages (from-to)495-502
Number of pages8
JournalArchives of Oral Biology
Volume57
Issue number5
DOIs
StatePublished - May 2012
Externally publishedYes

Fingerprint

Oral Lichen Planus
Toll-Like Receptor 2
Epithelial Cells
Epithelium
Interleukin-12
Saliva
Mouth Diseases
Microbial Interactions
Research Ethics Committees
Keratinocytes
Cell Communication
Interleukin-4
Dexamethasone
Lipopolysaccharides
Real-Time Polymerase Chain Reaction
Mucous Membrane
Proteins
Immunohistochemistry
Lymphocytes
Cytokines

Keywords

  • Keratinocytes
  • Oral lichen planus
  • Saliva
  • Toll-like receptor

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Cell Biology
  • Dentistry(all)

Cite this

Differential expression of TLR-2 and TLR-4 in the epithelial cells in oral lichen planus. / Janardhanam, Srihari B.; Prakasam, Sivaraman; Swaminathan, Venkatesh T.; Kodumudi, Krithika N.; Zunt, Susan L.; Srinivasan, Mythily.

In: Archives of Oral Biology, Vol. 57, No. 5, 05.2012, p. 495-502.

Research output: Contribution to journalArticle

Janardhanam, Srihari B. ; Prakasam, Sivaraman ; Swaminathan, Venkatesh T. ; Kodumudi, Krithika N. ; Zunt, Susan L. ; Srinivasan, Mythily. / Differential expression of TLR-2 and TLR-4 in the epithelial cells in oral lichen planus. In: Archives of Oral Biology. 2012 ; Vol. 57, No. 5. pp. 495-502.
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