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Related Experiment Videos

Selective macrophage suppression during sepsis.

Ekram Ellaban1, Gerry Bolgos, Daniel Remick

  • 1Department of Pathology, University of Michigan Medical School, Ann Arbor, MI 48109-0602, USA.

Cellular Immunology
|May 28, 2005
PubMed
Summary
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HYDROCORTISONE, ASCORBIC ACID, AND THIAMINE THERAPY DECREASE RENAL OXIDATIVE STRESS AND ACUTE KIDNEY INJURY IN MURINE SEPSIS.

Shock (Augusta, Ga.)·2022

Sepsis impairs macrophage function, but they are not completely paralyzed. Macrophages can still produce inflammatory mediators, especially in milder sepsis cases, indicating a selective rather than a complete loss of immune response.

Area of Science:

  • Immunology
  • Microbiology
  • Pathophysiology

Background:

  • Polymicrobial sepsis is known to suppress macrophage function.
  • Reduced pro-inflammatory cytokine production after lipopolysaccharide (LPS) re-exposure suggests impaired macrophage activity.
  • It remains unclear if macrophages are broadly immunoparalyzed or only refractory to specific stimuli like LPS.

Purpose of the Study:

  • To investigate the functional status of peritoneal macrophages during sepsis.
  • To determine if macrophages are broadly unresponsive (immunoparalyzed) or selectively impaired in their response to various immune stimuli.
  • To evaluate cytokine and chemokine production by macrophages following mild or severe sepsis induced by cecal ligation and puncture (CLP).

Main Methods:

  • Cecal ligation and puncture (CLP) was used to induce mild and severe polymicrobial sepsis in mice.

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  • Peritoneal macrophages were isolated 29 hours post-CLP.
  • Isolated macrophages were stimulated in vitro with lipopolysaccharide (LPS), lipoteichoic acid (LTA), or zymosan (ZYM) to assess cytokine and chemokine production.

    • Main Results:

    • Lipopolysaccharide (LPS) was a more potent stimulus for cytokine induction than lipoteichoic acid (LTA) or zymosan (ZYM) in both mild and severe sepsis.
    • In mild sepsis, macrophage responses to LPS were selective and less impaired compared to severe sepsis.
    • While IL-6 and KC production decreased, TNF-alpha and MIP-1alpha secretion increased in macrophages from mildly septic mice; IL-10, IL-1 receptor antagonist, MIP-2, and MCP-1 levels were comparable to naive macrophages.

    Conclusions:

    • Macrophages are not completely immunoparalyzed during sepsis.
    • The immune response of macrophages during sepsis is stimulus-dependent and can be selective.
    • Macrophages retain the capacity to secrete inflammatory mediators even during sepsis, particularly in less severe forms.