Cited by 181Wound Healing and TreatmentsNeutrophil, Myeloperoxidase and Oxidative MechanismsInflammation biomarkers and pathways

Reduced Neutrophil Chemotaxis and Infiltration Contributes to Delayed Resolution of Cutaneous Wound Infection with Advanced Age

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Brubaker, Aleah L, Rendon, Juan L, Ramirez, Luis, Choudhry, Mashkoor A, Kovacs, Elizabeth J·2013·The Journal of Immunology

Abstract

Advanced age is associated with alterations in innate and adaptive immune responses, which contribute to an increased risk of infection in elderly patients. Coupled with this immune dysfunction, elderly patients demonstrate impaired wound healing with elevated rates of wound dehiscence and chronic wounds. To evaluate how advanced age alters the host immune response to cutaneous wound infection, we developed a murine model of cutaneous Staphylococcus aureus wound infection in young (3–4 mo) and aged (18–20 mo) BALB/c mice. Aged mice exhibit increased bacterial colonization and delayed wound closure over time compared with young mice. These differences were not attributed to alterations in wound neutrophil or macrophage TLR2 or FcγRIII expression, or age-related changes in phagocytic potential and bactericidal activity. To evaluate the role of chemotaxis in our model, we first examined in vivo chemotaxis in the absence of wound injury to KC, a neutrophil chemokine. In response to a s.c. injection of KC, aged mice recruited fewer neutrophils at increasing doses of KC compared with young mice. This paralleled our model of wound infection, where diminished neutrophil and macrophage recruitment was observed in aged mice relative to young mice despite equivalent levels of KC, MIP-2, and MCP-1 chemokine levels at the wound site. This reduced leukocyte accumulation was also associated with lower levels of ICAM-1 in wounds from aged mice at early time points. These age-mediated defects in early neutrophil recruitment may alter the dynamics of the inflammatory phase of wound healing, impacting macrophage recruitment, bacterial clearance, and wound closure.

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  • Neutrophil numbers do not change with age, but neutrophils show profound functional alterations.

    “The number of neutrophils does not change with age, but profound functional alterations have been observed in this cell type [37,38].”

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Authors
Brubaker, A. L., Rendon, J. L., Ramirez, L., Choudhry, M. A., & Kovacs, E. J.
Affiliations
  • Loyola University Chicago (US)
  • Burn and Shock Trauma Institute, Loyola University Chicago Health Sciences Division , Maywood, IL 60153
Venue
The Journal of Immunology
Published
2013-02
Volume
190
Issue
4
Pages
1746-1757
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W1865977598
Cited by
181
References
97
Citations by year
2026: 10 · 2025: 17 · 2024: 11 · 2023: 18 · 2022: 15 · 2021: 16 · 2020: 19 · 2019: 12 · 2018: 11 · 2017: 12 · 2016: 15 · 2015: 8 · 2014: 11 · 2013: 6
FWCI
14.23
Type
journal article
Language
en
Open access
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Dr. Ralph and Marian Falk Medical Research Trust
  • National Institutes of Health
  • National Institute on Alcohol Abuse and Alcoholism (F30AA020167, T32AA013527)
  • National Institute on Aging (R01AG018859, T32AG031780)
Topics
  • Health Sciences › Medicine › Rehabilitation › Wound Healing and Treatments
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
  • Life Sciences › Immunology and Microbiology › Immunology › Inflammation biomarkers and pathways
Keywords
aging, neutrophil chemotaxis, neutrophil infiltration, Staphylococcus aureus, wound healing, KC chemokine, ICAM-1, macrophage recruitment, TLR2, FcγRIII, chronic wounds, elderly patients, innate immune dysregulation
MeSH terms
Aging, Animals, Chemotaxis, Leukocyte, Disease Models, Animal, Neutrophils, Skin, Staphylococcal Infections, Wound Healing, Down-Regulation, Neutrophil Infiltration, Mice

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