Surface triggering receptor expressed on myeloid cells 1 expression patterns in septic shock

Area of Science:

• Immunology
• Critical Care Medicine
• Molecular Biology

Background:

• Septic shock is a life-threatening condition characterized by dysregulated immune responses.
• Triggering receptor expressed on myeloid cells (TREM) 1 is an immune receptor implicated in inflammatory processes.
• Understanding TREM-1 expression patterns in septic shock is crucial for diagnosis and patient management.

Purpose of the Study:

• To investigate the cell-surface expression patterns of TREM-1 in patients with septic shock.
• To compare TREM-1 expression between septic shock, non-infectious shock, and healthy individuals.
• To assess the potential of TREM-1 as a biomarker for monitoring septic shock progression and outcomes.

Main Methods:

• A prospective clinical study was conducted in a medical intensive care unit.
• Flow cytometry was used to analyze TREM-1 expression on monocytes and neutrophils.
• Blood samples were collected from 25 septic shock patients, 15 non-infectious shock patients, and 7 healthy volunteers, with serial sampling in septic patients.

Main Results:

• Monocytic TREM-1 expression was significantly higher in septic shock patients compared to nonseptic patients and healthy volunteers.
• No significant differences in TREM-1 expression were observed on neutrophils across the groups.
• The temporal expression profile of TREM-1 on monocytes differed between survivors and non-survivors by day 3.

Conclusions:

• TREM-1 expression is specifically upregulated on monocytes during septic shock, indicating its role in infection-driven inflammation.
• Surface TREM-1 expression on monocytes shows potential as a dynamic biomarker for tracking patient recovery in septic shock.
• These findings highlight the diagnostic and prognostic value of monitoring TREM-1 in critical care settings.