Triggering receptor expressed on myeloid cells 1 (TREM1) is also known as CD antigen CD354, and is a type I transmembrane protein with a single Ig-like domain. TREM1 is highly expressed in adult liver, lung and spleen than in corresponding fetal tissue. TREM-1 / CD354 stimulates neutrophil and monocyte-mediated inflammatory responses, and also triggers release of pro-inflammatory chemokines and cytokines, as well as increased surface expression of cell activation markers. Amplifier of inflammatory responses that are triggered by bacterial and fungal infections and is a crucial mediator of septic shock. TREM1 can interacts with TYROBP / DAP12.