A form of immunologic tolerance through impairment of germinal center development.

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Abstract
Primary immunization with the T-cell-dependent antigen (4-hydroxy-3-nitrophenyl)acetyl (NP) coupled to human serum albumin results in the development of two pathways of B-cell development, the extrafollicular pathway and the germinal center pathway. Soluble, deaggregated NP-human serum albumin injected before immunization results in a marked diminution of clonable higher-affinity antibody-forming cell precursors--i.e., a form of immunologic tolerance within the secondary B-cell repertoire. We describe here the cellular changes in the spleen that underlie this tolerance. Using multiparameter flow cytometry, we show that tolerant mice develop far fewer NP-binding, peanut agglutinin-positive, or germinal center cells than the control immunized mice; 14 days after challenge control spleens have approximately 2 x 10(5) such cell per spleen, whereas the tolerant mice have approximately 1 x 10(4) cells. Furthermore, we demonstrate by immunohistology a reduction in the number of germinal centers containing lambda-bearing cells, characteristic of the response of C57BL/6 mice to NP. Taken together, these data suggest an impairment of germinal center development in the tolerant mice.