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1996-01-30
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Document 0542
DOCN M9610542
TI Increased proportion of CD8+ tumor responsive T cells after immunization
with tum- versus tum+ rat glioma.
DT 9601
AU Siesjo P; Visse E; Sjogren HO; Department of Tumor Immunology,
Wallenberg Laboratory, University; of Lund, Sweden.
SO Cell Immunol. 1995 Oct 15;165(2):225-33. Unique Identifier : AIDSLINE
MED/96021261
AB Previously established immunogenic (tum-) clones of an ENU
(ethyl-N-nitrosourea)-induced rat glioma, N32, were compared to the
original tumor concerning their capacity to induce T lymphocyte
responses after in vivo immunization and in vitro restimulation of
responder spleen cells in mixed lymphocyte tumor culture (MLTC) assays.
Quite unexpectedly, original N32 (tum+) in vivo primed spleen cells
proliferated to the same extent in vitro in response to tum+ stimulator
cells as did tum- in vivo primed spleen cells. However, flow-cytometric
analysis of parallel cultures showed a greatly increased proportion of
CD3+CD8+ lymphocytes in the proliferating responder cell population from
tum- immunized hosts, contrary to a CD3+CD4+ lymphocyte dominance after
tum+ immunization. Although the original tum+ N32 tumor cells are not
capable of inducing a clearly demonstrable isograft rejection response,
they induce a strong T cell response readily detectable in MLTC assays.
We propose that the increased CD8+ lymphocyte proliferation could be an
essential feature of the isograft rejection response induced by tum-
tumor variants. Possible mechanisms of the augmented CD8+ T cell
response are discussed.
DE Animal Comparative Study CD8-Positive T-Lymphocytes/*IMMUNOLOGY Flow
Cytometry Glioma/*IMMUNOLOGY Graft Rejection Immunization Lymphocyte
Transformation Rats Rats, Inbred F344 Support, Non-U.S. Gov't
Transplantation, Isogeneic Tumor Cells, Cultured JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).