The presence of a common idiotype in anti-H-2 immune sera as detected by anti-idiotype to a monoclonal anti-H-2 antibody

Evidence for a regulatory idiotypic network in the in vivo response to H-2 antigens

Treatment of BALB/c mice with purified pig antiidiotype to 11-4.1 (anti-H-2Kk) monoclonal antibody has been found previously to induce the appearance of idiotype-bearing molecules (Id') in the serum of these mice, in the absence of detectable antigen-binding activity. In the present study we examined the effect of subsequent immunization of such antiidiotype-primed mice with the original H-2Kk antigen. Skin grafting of virgin BALB/c mice with BALB.K skin did not generate any detectable Id' antibodies when tested by enzyme-linked immunosorbent assay (ELISA). In contrast, grafting of antiidiotype-primed mice with BALB.K skin specifically boosted ther serum level of Id' molecules. Challenge of antiidiotype-primed mice with either B10.D2 or rat skin had no effect on the production of such Id' molecules. Absorption studies demonstrated that the majority of Id' molecules induced by H-2Kk antigenic stimulus and detected in ELISA are antigen-nonbinding molecules, thus indicating specific restimulation by the original H-2Kk antigen of nonbinding idiotype-positive B cell clones. The relevance of these findings to the existence of network interactions in the immune response to H-2 antigens is discussed.

Long-term passive enhancement of allogeneic skin grafts with monoclonal antibodies

Monoclonal antibodies (mAb) to graft-specific class I or class II major histocompatibility antigens were tested for their ability to enhance the survival of allogeneic skin transplants. Mutant mouse strains were grafted with wild type tissue to restrict the antigenic differences being recognized. For allogeneic recognition of the class I antigen Ld, mutant BALB/c-H-2dm2 (dm2) mice were grafted with wild type BALB/cKh skin, and two dm2 anti-BALB/cKh mAb, 23-10-1 and 30-5-7, were tested for their ability to enhance. The anti-Ld antibody 23-10-1 (IgM) was found not to enhance the survival of BALB/c skin on dm2 mice. 30-5-7, however, an IgG2a antibody of indistinguishable specificity from 23-10-1, prolonged graft survival for approximately 5 days. For recognition of selected Iab determinants, mutant B6.C-H-2bm12 (bm12) mice were grafted with wild type B6/Kh skin, and mAb specific for the serological change(s) in bm12 were tested for their ability to enhance. The anti-Iab antibody 25-9-17 (IgG2a) was found not to enhance B6 grafts on bm12 mice. However, the enhancement seen with 25-9-17 using (C3H X bm12)F1 recipients was extraordinary, such that treated mice had a mean survival time three times that of the controls. Since 25-9-17 is of C3H origin, these results suggest that allotype (or possibly idiotype) compatibility is important in antibody enhancement. Another anti-Iab antibody 28-16-8 (IgM), also of C3H origin, failed to enhance a B6 graft on (C3H X bm 12)F1 mice.(ABSTRACT TRUNCATED AT 250 WORDS)

Analysis of the repertoire of anti-HLA antibodies with anti-idiotypes to a murine anti-HLA-A2,A28 monoclonal antibody

Xenoantibodies to idiotypes of the anti-HLA-A2,A28 MoAb CR11 -351 were isolated from an antiserum raised in rabbit #81 by immunizations with purified MoAb CR11 -351. The purification procedure involved absorption with insolubilized mouse immunoglobulins and monoclonal antibodies and affinity chromatography on insolubilized MoAb CR11 -351. Two antibody populations were identified in the xenoantibody preparation #81: one recognizes a recurrent idiotope expressed by the MoAb CR10 -215, CR10 -402, Q1/28, Q6 /64, and 6/31 to monomorphic determinants of HLA-A,B antigens and by the MoAb CR10 -343, CR11 -462, and Q5/6 to human Ia antigens. The other antibody population recognizes a private idiotope. Neither idiotope was detected on the anti-HLA-A2,A28 variant (A28) MoAbs BB7 .2, MA2 .2, and PA2.1, on the anti-HLA-A2,B17 MoAb MA2 .1 and on antibody populations in conventional anti-HLA-A2,A28 antisera. The idiotopes were also not detected on the anti-HLA-A2,A28 MoAb A2,A28 M1 which recognizes a determinant spatially close to that identified by the MoAb CR11 -351. The idiotope(s) recognized by the xenoantibodies #81 may be located in the combining site of the MoAb CR11 -351, since its incubation with the anti-idiotype antibodies specifically blocks the reactivity with lymphoid cells with the appropriate HLA phenotype.