Transplantable lymphoma cells, called reticulum cell sarcomas (RCS), from SJL mice induce strong proliferative responses and lymphokine production in syngeneic Lyl?+? 2?-? T cells but not in T cells from F?1? hybrid mice of SJL with strains expressing I-E. Thymus and lymph node cells from bone marrow chimeras of nonresponder F?1? into SJL respond as well as do SJL T cells and, conversely, T cells from SJL to F?1? chimeras fail to respond. It has been established that RCS cells do not express alien I-E-alpha chains, and monoclonal antibody to I-A?S? completely blocks T cell stimulation by RCS. Two-dimensional gel electrophoresis of labeled surface I-A show acidic A-alpha chains or RCS cells absent from normal SJL spleen cells but at least partially present on LPS-induced B-cell blasts. The molecular heterogeneity with respect to charge but not size is removed by treatment with neuraminidase, whereas tunicamycin-treated RCS and SJL spleen cell I-A molecules appear identical. Neuraminidase treatment enhances, while tunicamycin treatment abolishes, the ability of RCS to stimulate syngeneic T cells. Recently derived RCS-specific T cell clones respond to both RCS cells and to LPS-induced B cell blasts, but not to resting spleen cells from SJL or (SJL x BALB/c) F?1? hybrids and not to allogeneic (H2?b?) B cell blasts. The results to date suggest that the T cells which are stimulated by RCS, and whose response appears needed for RCS growth in vivo, are specific for activated B cell antigens, possibly glycosylated I-A molecules. These T cells may represent physiologically important autoreactive helper cells which, in SJL mice, are deregulated and promote growth of lymphomas of the B cell lineage. (LB)

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA014462-17
Application #
3163927
Study Section
Immunobiology Study Section (IMB)
Project Start
1976-05-01
Project End
1992-04-30
Budget Start
1989-06-12
Budget End
1990-04-30
Support Year
17
Fiscal Year
1989
Total Cost
Indirect Cost
Name
New York University
Department
Type
Schools of Medicine
DUNS #
004514360
City
New York
State
NY
Country
United States
Zip Code
10012
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