title: Characterization of T lymphocyte clones isolated from BCNU-cured LSA mice.
abstract: 1,3-Bis(chloroethyl)-1-nitrosourea (BCNU) has been shown to "cure" over 90% of the mice bearing the syngeneic tumor LSA, and the cured mice acquire elevated levels of tumor-specific immunity. In the present study, we report for the first time the establishment and characterization of several tumor-specific CD8+ cytotoxic T cell (CTL) clones from splenic T cells of BCNU-cured LSA mice. Many of these clones were found to be strongly cytotoxic to LSA but not to a different H-2b tumor target such as EL-4, or the natural killer (NK)-susceptible target YAC-1, NK-resistant target P815, or con A or LPS blasts from H-2b mice. Some of the clones showed a moderate level of cytotoxicity to the NK-susceptible target YAC-1. The relative roles of interleukins such as IL-2, IL-4 or IL-6 in supporting the proliferative response of some LSA-activated CTL clones were analyzed. As expected, recombinant human (rh) IL-2 alone supported the proliferative response of activated CTL clones. Addition of recombinant murine (rm) IL-4 or rhIL-6 alone to the culture failed to influence the response. Also, in combination with rhIL-2, neither rmIL-4 nor rhIL-6 appreciably augmented rhIL-2-supported proliferative response of CTL clones. These studies may provide insights for the development of effective approaches to modulate function and activity of effector T cells.
authors.affiliation: Department of Biology, Virginia Polytechnic Institute, State University, Blacksburg.
authors.forename: R S
authors.initials: RS
authors.lastname: Selvan
authors.forename: P S
authors.initials: PS
authors.lastname: Nagarkatti
authors.forename: M
authors.initials: M
authors.lastname: Nagarkatti
mesh_terms: D000818:Animals; D016827:CD8 Antigens / Q000032:analysis*; D002330:Carmustine / Q000627:therapeutic use*; D002999:Clone Cells / Q000187:drug effects; D003602:Cytotoxicity, Immunologic; D005260:Female; D007376:Interleukin-2 / Q000494:pharmacology; D015847:Interleukin-4 / Q000494:pharmacology; D015850:Interleukin-6 / Q000494:pharmacology; D008223:Lymphoma / Q000188:drug therapy* / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D013601:T-Lymphocytes / Q000187:drug effects / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*
chemical_list: D016827:CD8 Antigens; D007376:Interleukin-2; D015850:Interleukin-6; D015847:Interleukin-4; D002330:Carmustine