Abstract
Culture conditions were established for the reproducible induction of specific antibody responses in vitro using peripheral blood lymphocytes from tetanus toxoid (TT) immunized donors. Maximum anti-TT antibody responses (250-350 ng/ml) were detected on day 9 of culture, with optimum quantities of antigen (0.1-1.0 micrograms/ml TT) or Epstein-Barr virus (EBV). The antigen-driven antibody response unlike the EBV-induced polyclonal response was both T-cell and monocyte-dependent. TT stimulated mainly the IgM class of anti-TT antibody whereas EBV stimulated both IgM and IgG. A combination of TT and EBV caused a partially additive IgM response but suppressed the IgG class of anti-TT antibody. Transfer of cells from 9-day EBV-stimulated cultures to fresh cultures suppressed the anti-TT antibody response, possibly due to elevated levels of OKT8+ suppressor/cytotoxic cells found in culture after EBV infection. These results provide a reliable system for studying B-cell regulation in man.
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