Inducible functions in hybrids of a Lyt-2+ BW5147 transfectant and the 2C CTL line.
Cytolytic activity and release of interleukin 2 (IL-2) were induced in Lyt-2-positive T-T cell hybrids by incubation with either concanavalin A or irradiated stimulator cells. Since hybrids of Lyt-2-positive class I-specific cytotoxic T lymphocytes (CTLs) with the fusable mouse thymoma cell line, BW5147, are invariably Lyt-2-negative, a derivative of BW5147 was produced by transfection which constitutively expresses surface Lyt-2.1. This cell line, 3B2, was fused with the H-2Ld-specific long term CTL line, 2C. Such hybrids expressed the transfected Lyt-2 gene but not the endogenous gene of the 2C fusion partner. That Lyt-2 plays a functional role in hybrids of 3B2 with 2C is shown by the observations that: 1) cytolysis by Lyt-2-positive hybrids was inhibited by Lyt-2-specific monoclonal antibody (mAb); 2) Lyt-2-positive but not Lyt-2-negative subclones of one such line develop specific cytotoxicity when incubated with stimulator cells; 3) Less IL-2 was released from Lyt-2-negative subclones incubated with stimulator cells than from Lyt-2-positive subclones; 4) Lyt-2-specific mAb inhibits release of IL-2 from Lyt-2-positive hybrids incubated with stimulator cells. All Lyt-2-positive hybrids expressed functional surface Lyt-3 encoded by the CTL fusion partner, demonstrating that expression of the Lyt-3 gene is not sensitive to the negative regulation which shuts off the endogenous Lyt-2 gene in hybrids of class I-specific CTLs with the 3B2 or BW5147 cell lines. The existence of inducible T-T cell hybrids expressing functional Lyt-2 and Lyt-3 provides a system for evaluation of the role(s) of Lyt-2 and Lyt-3 in the induction of function independent of cell growth.
Gu
J J
JJ
Department of Microbiology, University of Texas, Austin 78712.
Gottlieb
P D
PD
D000818:Animals; D000911:Antibodies, Monoclonal; D000950:Antigens, Ly / Q000032:analysis* / Q000235:genetics; D002460:Cell Line; D003208:Concanavalin A / Q000494:pharmacology; D005434:Flow Cytometry; D015870:Gene Expression; D006183:H-2 Antigens / Q000276:immunology; D006822:Hybrid Cells; D007376:Interleukin-2 / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D010641:Phenotype; D013602:T-Lymphocytes, Cytotoxic / Q000502:physiology*; D014162:Transfection
D000911:Antibodies, Monoclonal; D000950:Antigens, Ly; D006183:H-2 Antigens; D007376:Interleukin-2; D003208:Concanavalin A