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In double-transgenic mice expressing a gene construct encoding hen egg lysozyme as well as rearranged anti-lysozyme antibody genes, large numbers of anti-lysozyme B cells are present in peripheral lymphoid tissues but are profoundly tolerant. The cellular basis for this form of non-deletional self-tolerance was explored. The tolerant anti-lysozyme B cells from double-transgenic mice were found to produce much less antibody than nontransgenic controls in T-cell-dependent antigen-specific responses, in adoptive transfer in vivo, and in hanging-drop cultures in vitro, as well as in response to stimulation with the nonspecific mitogen lipopolysaccharide. The diminished responsiveness of the tolerant B cells was not due to a reduction in the number of responding B-cell precursors per se nor were suppressor cells detected in titration, depletion, or mixing experiments. Nondeletional tolerance in this model, therefore, appears to result from an intrinsic functional change in the self-reactive B cells themselves.

Intrinsic B-cell hyporesponsiveness accounts for self-tolerance in lysozyme/anti-lysozyme double-transgenic mice.