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Decreased wound neutrophils and indiscrete margination in the pathogenesis of wound infection

R W Yurt, B A Pruitt

    Surgery
    |August 1, 1985
    PubMed

    Insights

    Greater burn injuries in rats lead to fewer neutrophils (PMNs) at the wound site, despite increased PMN sensitivity to bacterial factors. This suggests impaired neutrophil migration contributes to infection susceptibility after severe burns.

    Area of Science:

    • Immunology
    • Wound Healing
    • Pathogenesis of Infection

    Background:

    • Severe burns increase susceptibility to infection and septic death.
    • Neutrophil (PMN) function is critical in combating infection.
    • Understanding PMN behavior post-burn is crucial for improving outcomes.

    Purpose of the Study:

    • To investigate the role of neutrophils (PMNs) in the pathogenesis of increased infection susceptibility following thermal injury.
    • To evaluate PMN presence, circulation, and in vivo activity in a rat model after 30% and 60% burns.

    Main Methods:

    • Quantification of neutrophils (PMNs) in wound tissue and circulation at various time points post-burn.
    • In vivo assessment of PMN responsiveness to chemotactic stimuli (F-Met-Leu-Phe and zymosan-activated serum).
    • Comparison of PMN activity between burn injury groups (30% vs. 60%) and sham-burned controls.

    Main Results:

    • Fewer PMNs were found in wounds of rats with 60% burns compared to 30% burns at 8 hours post-injury.
    • Circulating PMN counts did not differ significantly between groups.
    • PMNs from rats with 60% burns showed increased sensitivity to bacterial chemotactic factors in vivo.

    Conclusions:

    • Rats with more severe burns exhibit fewer wound neutrophils, correlating with increased infection susceptibility.
    • Enhanced PMN sensitivity to bacterial factors, coupled with reduced wound infiltration, suggests impaired neutrophil margination is a key factor in burn-related infections.

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