This family consists of several mammalian signaling lymphocytic activation molecule (SLAM) proteins. Optimal T cell activation and expansion require engagement of the TCR plus co-stimulatory signals delivered through accessory molecules. SLAM, a 70-kDa co-stimulatory molecule belonging to the Ig superfamily, is defined as a human cell surface molecule that mediates CD28-independent proliferation of human T cells and IFN-gamma production by human Th1 and Th2 clones [1]. SLAM has also been recognised as a receptor for measles virus [2].

1: Molecular and functional characterization of mouse signaling lymphocytic activation molecule (SLAM): differential expression and responsiveness in Th1 and Th2 cells. Castro AG, Hauser TM, Cocks BG, Abrams J, Zurawski S, Churakova T, Zonin F, Robinson D, Tangye SG, Aversa G, Nichols KE, de Vries JE, Lanier LL, O'Garra A; J Immunol 1999;163:5860-5870. PMID:10570270

2: Measles virus infects and suppresses proliferation of T lymphocytes from transgenic mice bearing human signaling lymphocytic activation molecule. Hahm B, Arbour N, Naniche D, Homann D, Manchester M, Oldstone MB; J Virol 2003;77:3505-3515. PMID:12610126