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Induction of Ocular Surface Inflammation and Collection of Involved Tissues
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MyD88 contribution to ocular surface homeostasis.

Rose Y Reins1, Justin Courson1, Carolina Lema1

  • 1The Ocular Surface Institute, College of Optometry, University of Houston, Houston, Texas, United States of America.

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Summary

Myeloid differentiation primary response (MyD88) is crucial for corneal immune defense. MyD88-deficient mice showed altered inflammatory responses and reduced corneal sensitivity, impacting infection outcomes.

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Area of Science:

  • Ocular immunology
  • Innate immunity
  • Corneal biology

Background:

  • The cornea requires homeostasis for rapid response to injury and infection.
  • Toll-like receptors (TLRs) mediate innate immune responses to pathogens.
  • Myeloid differentiation primary response (MyD88) is essential for TLR and IL-1R signaling in immune defense.

Purpose of the Study:

  • To investigate the role of TLR signaling in ocular surface tissues.
  • To determine the baseline inflammatory mediators, response to mechanical stimuli, and infection susceptibility in MyD88-deficient mice.

Main Methods:

  • Analysis of inflammatory mediators (cytokines, chemokines, MMPs) in MyD88-deficient (MyD88-/-) and wild-type (WT) mice.
  • Assessment of corneal sensitivity and response to Pseudomonas aeruginosa challenge.
  • Exposure of ocular surface cells to TLR agonists to determine cytokine, chemokine, and MMP expression.

Main Results:

  • MyD88-/- mice exhibited lower MMP-9, IL-1α, TNFα, IL-2, IL-6, and IL-9 levels compared to WT.
  • Reduced CXCL1 and RANTES expression was observed in MyD88-/- tissues.
  • MyD88-/- mice showed decreased corneal sensitivity but better clinical scores post-infection, despite higher bacterial load.

Conclusions:

  • MyD88 signaling is critical for maintaining corneal immune homeostasis and response to insult.
  • MyD88 deficiency compromises baseline innate immune responses in the cornea.
  • TLR signaling plays a significant role in corneal defense mechanisms.