B6-hTREM1 Mouse

The Triggering Receptor Expressed on Myeloid Cells 1 (TREM1) gene encodes a transmembrane protein, also known as CD354, primarily expressed on myeloid cells such as neutrophils, monocytes, and macrophages, with expression also observed in dendritic cells, microglia, osteoclasts, platelets, and even some epithelial and endothelial cells ^[1]. Upon activation, the TREM1 protein amplifies inflammatory responses, often synergizing with Toll-like receptor (TLR) and NOD-like receptor (NLR) signaling pathways. This leads to the robust production and release of pro-inflammatory cytokines and chemokines, enhanced degranulation, phagocytosis, and respiratory burst in neutrophils and macrophages, and even promotes dendritic cell maturation ^[2]. A soluble form of TREM1 (sTREM1) also exists, which can act as a decoy receptor to modulate inflammation and serves as a biomarker for various inflammatory conditions ^[3]. Dysregulated TREM1 activity is implicated in a wide range of diseases, including infectious diseases like sepsis and pneumonia, chronic inflammatory conditions such as inflammatory bowel disease, atherosclerosis, rheumatoid arthritis, and various cancers (e.g., glioma, hepatocellular carcinoma, lung adenocarcinoma, breast, colon, and pancreatic cancers), as well as neurodegenerative disorders like Parkinson's and Alzheimer's disease, and kidney-related diseases ^[2-5].

The B6-hTREM1 mouse is a humanized model, constructed by replacing the mouse Trem1 signal peptide (aa. 1-20) and endogenous extracellular domain (aa. 21-202) with the human TREM1 signal peptide (aa. 1-20) and extracellular domain (aa. 21-205), while preserving the murine aa. 203-230. B6-hTREM1 mice can be used for research into the pathogenesis of various inflammatory diseases, cancers, neurodegenerative diseases, and kidney-related diseases, as well as for the screening, development, and safety evaluation of TREM1-targeted drugs.