[Host inflammatory and anti-inflammatory response during sepsis]

Area of Science:

• Immunology
• Critical Care Medicine
• Molecular Biology

Context:

• Sepsis is a leading cause of death in intensive care units (ICUs).
• Systemic inflammatory response syndrome (SIRS) occurs in ICU patients due to sepsis, shock, trauma, burns, or surgery.
• Both sepsis and non-infectious SIRS involve microbial motifs and cytokine dysregulation, complicating diagnosis.

Purpose:

• To investigate the altered ex vivo response of circulating leukocytes, particularly monocytes, in ICU patients with sepsis and SIRS.
• To understand the mechanisms behind leukocyte hyporesponsiveness to lipopolysaccharide (LPS).
• To explore the role of the transcription factor NF-κB and its regulators in this hyporesponsiveness.

Summary:

• Sepsis and SIRS patients exhibit altered ex vivo responses in circulating leukocytes, especially monocytes.
• This hyporesponsiveness to LPS is linked to reduced NF-κB activation and increased expression of its negative regulators.
• The observed leukocyte hyporesponsiveness is variable, depending on patient type, stimulus, timing, and cytokine profiles.

Impact:

• Highlights the complexity of diagnosing sepsis versus non-infectious SIRS using biological markers.
• Provides insights into the immunomodulatory mechanisms underlying critical illness.
• Suggests potential targets for therapeutic interventions aimed at restoring immune function in sepsis and SIRS.