Anti-I-J Alloantisera Elicited by Immunization of B10.A(3R) (I-Jb) Mice with Bone Marrow-derived Macrophages from B10.A(5R) (I-Jk) Mice

Overview

Journal Immunology

Specialty Allergy & Immunology

Date 1986 Mar 1

PMID 3957408

Authors

L M Bradley

S M Shiigi

A Malley

Affiliations

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Abstract

In this paper we describe production of alloantisera specific for determinants encoded by I-J gene loci expressed on macrophages. B10.A(3R) (I-Jb) mice were hyperimmunized with pure macrophages grown in vitro from bone marrow stem cells of congenic B10.A(5R) mice. The antisera contained predominantly IgM antibody that was non-adherent to protein-A-Sepharose with a minor component of IgG1, and IgG2a antibodies that were adherent to protein-A-Sepharose. The protein-A non-adherent antibody completely blocked the in vitro generation of humoral immune responses to sheep erythrocytes by spleen cell from B10.A(5R) mice and from inbred strains that share the I-Jk haplotypes, but did not alter the responses of spleen cells of the I-Jb haplotype. In the presence of complement, both protein-A adherent and protein-A non-adherent antibodies eliminated the capacity of B10.A(5R) spleen cells to generate humoral and proliferative responses, but the functional activity of B10.A(3R) cells was unaffected. These data indicate the I-Jk specificity of the antisera. The capacity of the anti-macrophage antibody to block humoral immune induction was removed by absorption with bone marrow-derived macrophages from B10.A(5R) mice, but not from B10.A(3R) mice. Further, the B10.A(5R) macrophages completely restored the humoral responses of antibody- and complement-treated B10.A(5R) spleen cells, but B10.A(3R) macrophages showed only partial restoration that was consistent with a factor-mediated allogeneic effect. These data demonstrate the specificity of our anti-I-J sera for macrophages and indicate that bone marrow-derived macrophages express surface I-J encoded molecules.

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