Murine B-cell subpopulations responsive to T-dependent and T-independent antigens.

Abstract

Strain A/J mice made secondary indirect plaque-forming cell (PFC) responses to azobenzenearsonate (ABA) conjugates of giant keyhole limpet hemocyanin (KLH), a thymic-dependent antigen, but not to conjugates of Ficoll, a T-independent antigen. ABA-Ficoll was also unable to elicit a response in animals primed with ABA-KLH, which have an expanded anti-ABA memory cell pool. On the other hand, ABA-Ficoll rendered mice unresponsive to ABA-KLH when administered before priming or boosting with the T-dependent immunogen. Hence, the T-independent antigen was able to tolerize but unable to trigger B-memory cells responsive to the T-dependent antigen. A/J mice immunized with dinitrophenyl conjugates of Ficoll or bovine IgG (BGG) made vigorous IgM and IgG PFC responses. PFC responses to ABA-KLH and 2,4-dinitrophenyl (DNP)-BGG were abrogated by depleting mice of C3 with cobra venom factor, whereas the IgM and IgG PFC responses to DNP-Ficoll were unaffected. B lymphocytes were fractionated on the basis of receptors for C3 and the subpopulations were assayed for in vitro PFC responses to DNP-Ficoll. Very little response was obtained from complement receptor lymphocyte [CRL(+)] B cells, whereas CRL(-) cells were more responsive than unfractionated B cells. Both populations responded to a polyclonal B-cell mitogen (lipopolysaccharide). On the other hand, the in vitro PFC response to a T-dependent antigen (sheep erythrocytes) correlated with the presence of CRL(+) B cells in the cultures. However, a minor component of this response, sensitive to anti-Thy-1 serum, was made by CRL(-) B cells, indicating the existence of subpopulations of T-dependent B cells with different signalling requirements. The results suggest that most B cells responsive to T-dependent antigens possess receptors for C3 and that C3 plays an obligatory role in the response of these cells. A distinct subpopulation of B cells which lack C3 receptors respond to T-independent antigens. The precursors of PFC for the ABA epitope reside largely or exclusively in the CRL(+) compartment in A/J mice, whereas precursors for the DNP determinant are found in both compartments.

Surface phenotyping, histology and the nature of non-Hodgkin lymphoma in 157 patients

“…According to one view ) the SIg+C3+ precursor from marrow has SIg+C3-phenotype. T-cell help may be required for the differentiation of the SIg+C3+ B cell into a plasma-cell precursor (Lewis et al, 1976). Pro-plasma cells do not recirculate and they probably express SIg+ or SIg+CyIg+ profiles.…”

Antigen Structure and Lymphocyte Activation

“…Antigen-binding cells were assayed by formation of rosettes between lymphocytes and haptenated sheep erythrocytes (ABA-SRBC) (Lewis et al 1976). Antigen-binding cells were assayed by formation of rosettes between lymphocytes and haptenated sheep erythrocytes (ABA-SRBC) (Lewis et al 1976).…”

“…A significant response to immunization with RAT itself could be shown only by an increase in antigen-binding lymphocytes; no significant delayed hypersensitivity by footpad swelling or lymphocyte transformation in vitro was observed. Antigen-binding cells were assayed by formation of rosettes between lymphocytes and haptenated sheep erythrocytes (ABA-SRBC) (Lewis et al 1976). The number of rosette-forming cells increases about 30-fold following immimization with RAT in CFA (Table III).…”

Mitogenic analysis of murine B-cell heterogeneity.

“…Thus, those B cells that give rise to antibody-producing cells can be divided into a subset that requires cooperation with T-derived lymphocytes and another subset that is T independent (1)(2)(3)(4)(5)(6). Recently, it has been shown that the B-cell population also contains suppressor cells that regulate various functions of T cells (7)(8)(9)(10)(11) and that these suppressor cells seem to be different from antibody-producing cells (10,11).…”