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CR2+ marginal zone B cell production of pathogenic natural antibodies is C3 independent.

ABSTRACT: Intestinal ischemia-reperfusion (IR)-induced damage requires complement receptor 2 (CR2) for generation of the appropriate natural Ab repertoire. Pathogenic Abs recognize neoantigens on the ischemic tissue, activate complement, and induce intestinal damage. Because C3 cleavage products act as ligands for CR2, we hypothesized that CR2(hi) marginal zone B cells (MZBs) require C3 for generation of the pathogenic Abs. To explore the ability of splenic CR2(+) B cells to generate the damaging Ab repertoire, we adoptively transferred either MZBs or follicular B cells (FOBs) from C57BL/6 or Cr2(-/-) mice into Rag-1(-/-) mice. Adoptive transfer of wild type CR2(hi) MZBs but not CR2(lo) FOBs induced significant damage, C3 deposition, and inflammation in response to IR. In contrast, similarly treated Rag-1(-/-) mice reconstituted with either Cr2(-/-) MZB/B1 B cells (B1Bs) or FOBs lacked significant intestinal damage and displayed limited complement activation. To determine whether C3 cleavage products are critical in CR2-dependent Ab production, we evaluated the ability of the natural Ab repertoire of C3(-/-) mice to induce damage in response to IR. Infusion of C3(-/-) serum into Cr2(-/-) mice restored IR-induced tissue damage. Furthermore, Rag-1(-/-) mice sustained significant damage after infusion of Abs from C3(-/-) but not Cr2(-/-) mice. Finally, adoptive transfer of MZBs from C3(-/-) mice into Rag-1(-/-) mice resulted in significant tissue damage and inflammation. These data indicate that CR2 expression on MZBs is sufficient to induce the appropriate Abs required for IR-induced tissue damage and that C3 is not critical for generation of the pathogenic Abs.

SUBMITTER: Woods KM

PROVIDER: S-EPMC3024465 | biostudies-literature | 2011 Feb

REPOSITORIES: biostudies-literature

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CR2+ marginal zone B cell production of pathogenic natural antibodies is C3 independent.

Woods Keith M KM Pope Michael R MR Hoffman Sara M SM Fleming Sherry D SD

Journal of immunology (Baltimore, Md. : 1950) 20101227 3

Intestinal ischemia-reperfusion (IR)-induced damage requires complement receptor 2 (CR2) for generation of the appropriate natural Ab repertoire. Pathogenic Abs recognize neoantigens on the ischemic tissue, activate complement, and induce intestinal damage. Because C3 cleavage products act as ligands for CR2, we hypothesized that CR2(hi) marginal zone B cells (MZBs) require C3 for generation of the pathogenic Abs. To explore the ability of splenic CR2(+) B cells to generate the damaging Ab reper ...[more]

PMID: 21187447

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Project description:Purpose: Production of broad-spectrum antibodies against T cell-dependent antigens requires marginal zone (MZ) B cells to present antigenic peptides complexed to MHC II. Here we describe the trogocytic acquisition of these complexes from dendritic cells (DCs). Complement C3 (C3) binds to MHC II on murine and human DCs. Recognition of C3 by MZ B cell complement receptor 2 triggers trogocytosis of DC plasma membrane and its receptors, which become exposed on the MZ B cells. Excessive trogocytosis is deleterious but prevented by membrane ubiquitin ligase MARCH1, which limits the number of MHC II–C3 complexes displayed on the DC surface. MHC II molecules are thus receptors for constitutively activated and potentially harmful C3, an activity that enables acquisition of DC-like functions by trogocytic MZ B cells. Methods: mRNA profiles of splenic cDC1s, B cells and CD11cintCD24+CD8int cells of wild type (WT) and March1-/- mice mice were generated by deep sequencing, in triplicate, using Illumina HiSeq 2500. All 100-base-pair single-end reads were mapped to the reference mouse genome (GRCm38/mm10) using STAR aligner, and gene-wise counts were obtained using Subread package. Differential expression analysis of RNA sequencingdata was carried out using the edgeR and limma-voom packages in Bioconductor. Results: Using an optimized data analysis workflow, we mapped about 14 million sequence reads per sample to the mouse genome (build mm10) and identified 16,182 genes in the different cell types from WT and March1−/− mice.Transcriptomic profiling revealed over 6500 genes differentially expressed between cDC1s and B cells. Principle component analyses revealed very few differences between WT and March1−/− cDC1s, and between WT and March1−/− B cells. Notably, the transcriptome of CD11cintCD24+CD8int cells was similar to those of WT or March1−/− B cells, indicating they belonged to the B cell lineage. Conclusions: In our study we have described that MHC II ubiquitination by MARCH1 plays two important roles: first, to enhance the removal of surface MHC II–C3 complexes on all APCs; and second, to limit MZ B cell trogocytosis and elimination of cDCs. It is conceivable these two functions, more than the regulation of MHC II antigen presentation, have been the major drivers for the conservation of MHC II ubiquitination through evolution.

Dataset Information

CR2+ marginal zone B cell production of pathogenic natural antibodies is C3 independent.

Publications

CR2+ marginal zone B cell production of pathogenic natural antibodies is C3 independent.

Similar Datasets

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