The Ly-10 antigen is a marker of mouse-activated T lymphocytes.
Ly-10.1 is a lymphocyte surface antigen controlled by a gene linked to the Ly-1.1 locus and expressed on activated T helper, T suppressor (Ts), and cytotoxic T lymphocytes (CTL). In this report, we describe the following: 1) Ly-10 is a heterodimeric glycoprotein consisting of a 80,000 heavy and a 34,000 light chain. 2) Although mature CTL are Ly-10+ by negative selection with anti-Ly-10.1 and complement (C), CTL precursors reactive to allogeneic cells are Ly-10-. 3) Similarly, IL-2-producing effector T cells induced by Mls-incompatible cells and semiallogeneic stimulation are eliminated by anti-Ly-10.1 and C after activation but are not eliminated as precursors before activation. 4) In mixed lymphocyte culture with semiallogeneic cells, the frequency of Ly-10.1+ cells was highest on the 2nd to 5th day after stimulation, decreased by the 12th day, and increased after restimulation with fresh antigen as demonstrated by immunofluorescence, C-mediated lysis, and IL-2 production. 5) When spleen cells were treated with anti-Ly-10 and C before concanavalin A (Con A) activation, the suppressive activity in the Con A T blasts was reduced, suggesting that in normal mice, some Ts preexist in a Ly-10+ activated state. These results indicate that Ly-10 is a marker of activation of T cells, not expressed on precursor T cells and whose expression is both transient and dependent on the presence of antigen. The similarities in biochemical and cellular characteristics suggest that Ly-10 is a mouse homologue of the human lymphocyte activation marker 4F2.
Chan
M M
MM
Immunology Program, Memorial Sloan-Kettering Cancer Center, New York 10021.
Hämmerling
U
U
Stutman
O
O
D000818:Animals; D000945:Antigens, Differentiation, T-Lymphocyte / Q000235:genetics / Q000276:immunology* / Q000302:isolation & purification; D000950:Antigens, Ly / Q000235:genetics / Q000276:immunology* / Q000302:isolation & purification; D003208:Concanavalin A; D005455:Fluorescent Antibody Technique; D007376:Interleukin-2 / Q000096:biosynthesis; D007700:Kinetics; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D010641:Phenotype; D013234:Stem Cells / Q000145:classification / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000145:classification / Q000276:immunology* / Q000378:metabolism; D050378:T-Lymphocytes, Regulatory / Q000276:immunology
D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly; D007376:Interleukin-2; D003208:Concanavalin A