Therapy of disseminated murine leukemia with cyclophosphamide and immune Lyt-1+,2- T cells. Tumor eradication does not require participation of cytotoxic T cells

J Exp Med. 1985 May 1;161(5):1122-34. doi: 10.1084/jem.161.5.1122.


The ability of noncytolytic Lyt-1+,2- T cells immune to FBL-3 leukemia to effect eradication of disseminated FBL-3 was studied. Adult thymectomized, irradiated, and T-depleted bone marrow-reconstituted (ATXBM) B6 hosts were cured of disseminated FBL-3 by treatment with 180 mg/kg cyclophosphamide (CY) and adoptively transferred Lyt-1+,2- T cells obtained from congenic B6/Thy-1.1 donors immune to FBL-3. Analysis of the T cell compartment of ATXBM hosts treated and rendered tumor-free by this therapy revealed that the only T cells present in the mice were donor-derived Lyt-1+,2- T cells. In vitro stimulation of these T cells with FBL-3 tumor cells, which express class I but no class II major histocompatibility complex antigens, induced lymphokine secretion, but did not result in the generation of cytotoxic T lymphocytes (CTL). Thus, in a setting in which mice lack Lyt-2+ T cells, and in which no CTL of either host or donor origin could be detected, immune Lyt-1+,2- T cells, in conjunction with CY, mediated eradication of a disseminated leukemia. The results suggest that delayed-type hypersensitivity responses induced by immune T cells represent a potentially useful effector mechanism for in vivo elimination of disseminated tumor cells.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Antigens, Ly / genetics
  • Cyclophosphamide / therapeutic use*
  • Graft Rejection*
  • Histocompatibility Antigens Class II / analysis
  • Immunization, Passive / methods*
  • Interferon-gamma / pharmacology
  • Leukemia, Experimental / drug therapy
  • Leukemia, Experimental / immunology
  • Leukemia, Experimental / therapy*
  • Mice
  • Mice, Inbred BALB C
  • Mice, Inbred C57BL
  • Phenotype
  • Radiation Chimera
  • Spleen / cytology
  • T-Lymphocytes / classification
  • T-Lymphocytes / immunology
  • T-Lymphocytes / transplantation*
  • T-Lymphocytes, Cytotoxic / immunology
  • T-Lymphocytes, Cytotoxic / transplantation


  • Antigens, Ly
  • Histocompatibility Antigens Class II
  • Interferon-gamma
  • Cyclophosphamide