THE ROLE OF IDIOTYPE-SPECIFIC, CD4+ T-CELLS IN TUMOR RESISTANCE AGAINST MAJOR HISTOCOMPATIBILITY COMPLEX CLASS-II MOLECULE NEGATIVE PLASMACYTOMA CELLS

被引:73
|
作者
LAURITZSEN, GF
BOGEN, B
机构
[1] Institute of Immunology and Rheumatology, University of Oslo
关键词
D O I
10.1006/cimm.1993.1100
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
It is known that immunoglobulins can be processed and that idiotypic peptides are presented on MHC class II molecules to T cells. It has also been demonstrated that T cells can recognize a complex of an Id-peptide/MHC molecule as a tumor-specific antigen on B lymphoma cells. However, plasmacytomas, an important type of B cell malignancies, most often lack class II molecules and are thus expected to be poor targets for Id-specific, CD4+ T cells. Nevertheless, we now demonstrate that cloned, MHC class II restricted T cells, specific for a λ2315 idiotypic peptide, convey protection in vivo (Winn assay) against the class II molecule-negative MOPC315 (α, λ2315) plasmacytoma. T cells can also inhibit the growth of MOPC315 cells in vitro provided that MHC compatible (H-2d) splenocytes and extra λ2315 are added. Based on these data we suggest that the myeloma protein secreted by MOPC315 cells attains such a high local concentration in vivo that it is processed and presented by neighboring host APC to the Id-specific T cells. Such activated T cells secrete lymphokines which may directly affect the growth of MOPC315 cells in the vicinity. Alternatively, lymphokines from activated T cells stimulate local host cells, like macrophages, to become tumoricidal. © 1993 Academic Press. All rights reserved.
引用
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页码:177 / 188
页数:12
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