| First Author | Li N | Year | 2004 |
| Journal | J Immunol | Volume | 173 |
| Issue | 11 | Pages | 6806-12 |
| PubMed ID | 15557174 | Mgi Jnum | J:94361 |
| Mgi Id | MGI:3512643 | Doi | 10.4049/jimmunol.173.11.6806 |
| Citation | Li N, et al. (2004) Biochemical analysis of the regulatory T cell protein lymphocyte activation gene-3 (LAG-3; CD223). J Immunol 173(11):6806-12 |
| abstractText | Lymphocyte activation gene-3 (LAG-3; CD223) is a CD4-related transmembrane protein that binds to MHC class II molecules. We have recently shown that LAG-3 is required for maximal regulatory T cell function, and that ectopic expression of LAG-3 is sufficient to confer regulatory activity. In this study we show that LAG-3 is cleaved within the D4 transmembrane domain connecting peptide into two fragments that remain membrane associated: a 54-kDa fragment that contains all the extracellular domains and oligomerizes with full-length LAG-3 (70 kDa) on the cell surface via the D1 domain, and a 16-kDa peptide that contains the transmembrane and cytoplasmic domains. This NH(2)-terminal fragment is subsequently released as soluble LAG-3 (sLAG-3), a process that is increased after T cell activation in vitro and in vivo, and is found in the sera of C57BL/6 and RAG-1(-/-) mice. Modulation of LAG-3 cleavage may contribute to the function of this key regulatory T cell protein. |
