Abstract
We have investigated primary and secondary responses of mouse splenic T cells to strong mixed lymphocyte stimulating antigens controlled by theMls locus using MHC-identical mixtures of cells. Our studies show that strong primaryMls-locus specific responses involve recognition of self I-A antigens, since BUdR and light suicide or F1 into parent radiation bone-marrow chimeras both demonstrate a preference of unprimed F1 T cells to respond to Mis-locus antigens associated with one parent's MHC antigens. Furthermore, conventional anti-I-A antisera and monoclonal anti-I-A antibody both inhibitMls-locus responses in an MHC-specific manner. Finally, as is typical of T cells responding to I-A antigens or to nominal antigens associated with self I-A,Mlslocus responses are mediated by Lyt-1+, 2− cells. One striking finding in these studies was the very high frequency of cells capable of responding to Mls-locus antigens, the highest being 1/300 splenic T cells. This plus evidence for recruitment during primaryMls-locus responses may account for reports of a lack ofI-A restriction in secondary anti-Mls locus responses to strong Mls-locus antigens, a finding with which we concur. The possibility that these secondary responses between noncongenic strains of mice may be directed at other genetic loci is also discussed. These experiments leave open the question of the biological role of theMls-locus and of the very large number of T cells reactive to it.
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Abbreviations
- MHC:
-
Major histocompatibility complex
- MIg:
-
Mouse immunoglobulin
- MLC:
-
Mixed lymphocyte culture
- TCGF:
-
T-cell growth factor
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Janeway, C.A., Lerner, E.A., Jason, J.M. et al. T lymphocytes responding to Mls-locus antigens are Lyt-1+, 2− andI-A restricted. Immunogenetics 10, 481–497 (1980). https://doi.org/10.1007/BF01572583
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DOI: https://doi.org/10.1007/BF01572583