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Long Term Chronic Pseudomonas aeruginosa Airway Infection in Mice
15:43

Long Term Chronic Pseudomonas aeruginosa Airway Infection in Mice

Published on: March 17, 2014

Aging and PMN response to P. aeruginosa infection

K A Kernacki1, R P Barrett, S A McClellan

  • 1Department of Anatomy and Cell Biology, Wayne State University School of Medicine, Detroit, Michigan 48201, USA.

Investigative Ophthalmology & Visual Science
|September 1, 2000
PubMed
Abstract

Insights

Aging impairs polymorphonuclear neutrophil (PMN) function, leading to delayed bacterial clearance and increased corneal damage after Pseudomonas aeruginosa infection. Macrophage inflammatory protein-2 (MIP-2) neutralization mitigates these aging-related immune deficits.

Area of Science:

  • Immunology
  • Ophthalmology
  • Microbiology

Background:

  • Aging is linked to immune system dysfunction, potentially increasing disease severity in older individuals.
  • Polymorphonuclear neutrophils (PMNs) are critical immune cells involved in combating bacterial infections, including those affecting the cornea.

Purpose of the Study:

  • To investigate aging-related alterations in PMN function following corneal infection with Pseudomonas aeruginosa.
  • To determine the role of macrophage inflammatory protein-2 (MIP-2) in the aged immune response to P. aeruginosa keratitis.

Main Methods:

  • Comparison of PMN number, MIP-2 expression (mRNA and protein), and bacterial load in young (8-week) and aged (12-month) BALB/c mice post-P. aeruginosa infection.
  • Systemic administration of MIP-2 neutralizing antibody in aged mice to assess its impact on ocular disease and PMN recruitment.

Main Results:

  • Aged mice exhibited delayed PMN infiltration and impaired bacterial load reduction in the cornea.
  • Increased PMN numbers in aged corneas correlated with persistent MIP-2 expression.
  • MIP-2 neutralization in aged mice reduced corneal PMN infiltration and attenuated ocular disease severity.

Conclusions:

  • Persistent PMN presence in the cornea of aged mice contributes to tissue destruction after P. aeruginosa challenge.
  • The chemoattractant MIP-2 plays a significant role in the altered PMN response observed in aged individuals during P. aeruginosa keratitis.

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