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Tympanic membrane metalloproteinase inflammatory response

Jason G Wilmoth1, Gregory S Schultz, Patrick J Antonelli

  • 1Department of Otolaryngology, University of Florida, Gainesville, FL 32610-0264, USA.

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|December 10, 2003
PubMed
Abstract

Insights

Matrix metalloproteinases (MMPs) in tympanic membranes (TM) are expressed in response to inflammatory mediators like tumor necrosis factor-alpha (TNF-alpha) and lipopolysaccharide (LPS). This suggests a role for MMPs in cholesteatoma pathogenesis.

Area of Science:

  • Otolaryngology
  • Biochemistry
  • Pathology

Background:

  • Cholesteatoma pathogenesis involves complex inflammatory processes.
  • Matrix metalloproteinases (MMPs) are implicated in tissue remodeling and degradation.

Purpose of the Study:

  • To investigate if tumor necrosis factor-alpha (TNF-alpha) and lipopolysaccharide (LPS) stimulate MMP expression in tympanic membranes (TM).
  • To explore the potential role of this stimulation in cholesteatoma development.

Main Methods:

  • Gerbil tympanic membranes (TMs) were cultured with TNF-alpha or LPS.
  • Quantitative analysis of TNF-alpha and MMPs was conducted on homogenized TMs and culture supernatants.

Main Results:

  • TMs cultured with inflammatory mediators showed MMP expression.
  • Supernatant levels of MMP2 increased with exposure to LPS and TNF-alpha.
  • TNF-alpha levels in the supernatant also elevated with LPS exposure.

Conclusions:

  • Cultured TMs express MMPs when exposed to bacterial and host inflammatory mediators.
  • These findings support a link between inflammation and MMP secretion in the TM.
  • This MMP secretion may contribute to the pathogenesis of cholesteatoma.

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