Impaired regulation of Epstein-Barr virus-induced lymphocyte proliferation in rheumatoid arthritis is due to a T cell defect
- PMID: 6271870
Impaired regulation of Epstein-Barr virus-induced lymphocyte proliferation in rheumatoid arthritis is due to a T cell defect
Abstract
The rate of outgrowth of EBV-infected B lymphocytes is regulated by normal T lymphocytes. Removal of T cells from normal whole lymphoid populations (PBM) markedly shortens the outgrowth time of the remaining B lymphocytes. There is little difference in the much more rapid outgrowth of rheumatoid PBM after the removal of T cells, which suggests that RA lymphoid cells are unable to regulate this process. To determine whether RA T cells are defective, or EBV-infected RA B cells are unresponsive to regulatory signals, EBV-induced outgrowth in autologous and allogeneic mixtures of RA and normal B and T cells was evaluated, employing morphologic criteria and 3H-thymidine incorporation. The difference in outgrowth between RA and normal PBM was reproduced by reconstitution of EBV-infected B cells with mitomycin-treated autologous T cells. In cell-mixing experiments, normal T cells appropriately regulated both normal and RA B cells similarly, whereas RA T cells were defective in regulating either B cell population. Thus, the rapid outgrowth of EBV-infected rheumatoid lymphoid cells is due to defective T cell regulation. Moreover, normal regulation does not require cell proliferation.
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