MiRNA-181a regulates Toll-like receptor agonist-induced inflammatory response in human fibroblasts

J. C. Galicia, A. R. Naqvi, C. C. Ko, S. Nares, A. A. Khan

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


MicroRNAs (miRNAs) regulate the synthesis of cytokines in response to Toll-like receptor (TLR) activation. Our recent microarray study comparing normal and inflamed human dental pulps showed that miRNA-181 (miR-181) family is differentially expressed in the presence of inflammation. Prior studies have reported that the dental pulp, which is composed primarily of TLR4/2+ fibroblasts, expresses elevated levels of cytokines including interleukin-8 (IL-8) when inflamed. In this study, we employed an in-vitro model to determine the role of the miRNA-181 family in the TLR agonist-induced response in human fibroblasts. TLR4/2+ primary human dental pulp fibroblasts were stimulated with lipopolysaccharide from Porphyromonas gingivalis (Pg LPS), a known oral pathogen, and IL-8 and miR-181 expression measured. An inversely proportional relationship between IL-8 and miR-181a was observed. In-silico analysis identified a miR-181a-binding site on the 3′ untranslated region (UTR) of IL-8, which was confirmed by dual-luciferase assays. MiR-181a directly binds to the 3′UTR of IL-8, an important inflammatory component of the immune response, and modulates its levels. This is the very first report demonstrating miR-181a regulation of IL-8.

Original languageEnglish (US)
Pages (from-to)333-337
Number of pages5
JournalGenes and Immunity
Issue number5
StatePublished - 2014
Externally publishedYes

ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics
  • Immunology


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