Monocyte TREM-1 membrane expression in non-infectious inflammation

Area of Science:

• Immunology
• Cell Biology
• Pathology

Background:

• Sterile inflammation and severe infections exhibit overlapping pathophysiological events.
• Molecular patterns, such as damage-associated molecular patterns (DAMPs) and pathogen-associated molecular patterns (PAMPs), initiate inflammatory responses.
• These patterns trigger the release of inflammatory mediators and alter cell surface receptor expression.

Purpose of the Study:

• To elucidate the shared molecular mechanisms underlying sterile and infectious inflammation.
• To identify common cellular markers indicative of both inflammatory states.

Main Methods:

• Analysis of inflammatory mediator release.
• Assessment of cell surface receptor expression, specifically focusing on myeloid cells.
• Comparative study of immune responses in sterile versus infectious inflammatory conditions.

Main Results:

• Both sterile and infectious inflammation involve similar inflammatory mediator release.
• A significant increase in the expression of triggering receptor expressed on myeloid cells 1 (TREM1) was observed on monocytes and neutrophils in both conditions.
• TREM1 expression serves as a common hallmark for both infectious and non-infectious inflammatory processes.

Conclusions:

• Infectious and sterile inflammation share common molecular triggers and cellular responses.
• Increased TREM1 expression on myeloid cells is a conserved marker for diverse inflammatory conditions.
• Targeting TREM1 may offer therapeutic potential for a broad range of inflammatory diseases.