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The triggering receptor expressed on myeloid cells (TREM) gene cluster encodes a group of transmembrane proteins that are emerging as important components in innate and adaptive immunity. In both mice and humans, the TREM gene cluster encodes eight receptors; only four of these, however, are direct homologs: TREM-1, TREM-2, TREM-like transcript 1 (TLT1), and TLT2. Of the transmembrane receptors encoded by the four conserved genes within this cluster, TLT2 has not been studied previously. Data presented in this study demonstrate that TLT2 is expressed early in B cell development in conjunction with B220 and is detected on all developing mouse B cell populations as well as B cells in the periphery. TLT2 expression on B cells in the periphery exhibits a distinct hierarchy with the highest detectable levels observed on B1 B cells in the peritoneum. The overall gradation of TLT2 expression on B cells is: B1 &gt; marginal zone/transitional 2 &gt; transitional 1 &gt; follicular. Additionally, TLT2 expression was observed on mouse neutrophils throughout the body. Although monocytes were not observed to express TLT2, resident peritoneal and lung macrophages do express TLT2, suggesting that it is up-regulated in association with terminal differentiation of monocytes. Finally, both neutrophils and macrophages were observed to up-regulate TLT2 expression in vivo in response to inflammatory stimuli, whereas TLT2 expression on B cells remained unchanged. In conclusion, the data suggest that TLT2 may be involved in the innate immune response based on its expression profile and the fact that it is up-regulated in response to inflammation.

Trem-Like Transcript 2 Is Expressed on Cells of the Myeloid/Granuloid and B Lymphoid Lineage and Is Up-Regulated in Response to Inflammation