Separable Populations of Activated Thymus-derived Lymphocytes Identified in Two Assays for Cell-mediated Immunity to Murine Tumor Allografts

Overview

Journal J Exp Med

Specialties Allergy & Immunology
General Medicine

Date 1974 Jul 1

PMID 4545897

Citations 6

Authors

R E Tigelaar

R M Gorczynski

Affiliations

Soon will be listed here.

Abstract

The immune response of C57BL mice to a DBA/2 tumor allograft has been assessed in two assays of cell-mediated immunity, the in vitro lysis of (51)Cr-labeled target cells and the antigen-mediated inhibition of macrophage migration. Both assays were shown to be measuring a T-cell-mediated reaction. Three types of experiments suggested that distinct subpopulations of T cells mediate these reactions. The tissue distributions of these activities was distinctive; both activities were present in spleens from i.p. immunized mice, but only macrophage migration inhibition activity was found in the peripheral lymph nodes (PLN) of such mice. Adoptive transfer of immune spleen cells into irradiated syngeneic recipients revealed that while a substantial amount of migration inhibition activity could subsequently be found in PLN, cytotoxic activity was found predominantly in the spleens of these adoptive hosts. Velocity sedimentation analysis of immune cells 14 days after i.p. immunization indicated that while the majority of cytotoxic activity was associated with small and medium lymphocytes, the majority of migration inhibition activity was associated with medium and large lymphocytes. In addition, normal spleen cells were fractionated by velocity sedimentation immediately before allosensitization in vitro. Subsequent analysis of the sensitized fractions revealed that the activity profiles for cytotoxicity and macrophage migration inhibition were not coincident. The implications of these observations are discussed.

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