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Analysis of proposed human B1 cells

ABSTRACT: The recent discovery of the human B1 cells, identified by the expression of CD20, CD27 and CD43 in absence of expression of CD70 and CD69 has been subject of debate. Some studies have raised the possibility that these cells are B cells differentiating towards the plasmablast and plasma cell stage rather than being the human counterpart of murine B1 cells. No further in depth studies have been performed. Therefore, a functional comparison was made between, the proposed B1 cells and plasmablasts. We observed that for several functional characteristics (distribution of isotypes of spontaneously producted antibodies, production of antigen-specific antibodies after vaccination with both T-cell dependent as well as T-cell independent antigen, the proposed B1 cells behaved similar to plasmablasts. In addition, we were able to differentiate the proposed B1 cells in vitro, indicating that they are not from a distinct lineage as the murine B1 cells. Gene expression analysis revealed that these cells cluster between memory B cells and plasmablasts, contradicting them being the genuine human counterpart of murine B1 cells, rather revealing a preplasmablast phenotype. Different B cells subsets were isolated from PBMC from healthy donors by a combination of magnetic and fluorescence activated cell sorting

ORGANISM(S): Homo sapiens

SUBMITTER: Leentje Van Lommel

PROVIDER: E-GEOD-42724 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Analysis of proposed human B1 cells

Project description:The recent discovery of the human B1 cells, identified by the expression of CD20, CD27 and CD43 in absence of expression of CD70 and CD69 has been subject of debate. Some studies have raised the possibility that these cells are B cells differentiating towards the plasmablast and plasma cell stage rather than being the human counterpart of murine B1 cells. No further in depth studies have been performed. Therefore, a functional comparison was made between, the proposed B1 cells and plasmablasts. We observed that for several functional characteristics (distribution of isotypes of spontaneously producted antibodies, production of antigen-specific antibodies after vaccination with both T-cell dependent as well as T-cell independent antigen, the proposed B1 cells behaved similar to plasmablasts. In addition, we were able to differentiate the proposed B1 cells in vitro, indicating that they are not from a distinct lineage as the murine B1 cells. Gene expression analysis revealed that these cells cluster between memory B cells and plasmablasts, contradicting them being the genuine human counterpart of murine B1 cells, rather revealing a preplasmablast phenotype.

2013-05-01 | GSE42724 | GEO

Homo sapiens

Project description:Analysis of proposed human B1 cells

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Analysis of CD70 wild type or CD70 knock out CD70-specific nanoCAR T cells

Project description:CD70 is an attractive target for chimeric antigen receptor (CAR) T cell therapy as treatment for both solid and liquid malignancies. However, functionality of CD70-specific CAR T cells is only modest. Here, we optimized a CD70-specific VHH based CAR (nanoCAR). We evaluated the nanoCARs in clinically relevant models in vitro, using co-cultures of CD70-specific nanoCAR T cells with malignant rhabdoid tumor organoids, and in vivo by using a diffuse large B cell lymphoma (DLBCL) patient-derived xenograft (PDX) model. Whereas the nanoCAR T cells were highly efficient in organoid co-cultures, they showed only modest efficacy in the PDX model. Knocking out CD70 expression in the nanoCAR T cells resulted in dramatically enhanced functionality in the PDX model, suggesting that CD70 interaction in cis with the nanoCAR induces exhaustion. Through single-cell transcriptomics, we obtained evidence that CD70 KO CD70-specific nanoCAR T cells are protected from antigen-induced exhaustion. Our data show that CARs targeted to endogenous T cell antigens, negatively affect CAR T cell functionality by inducing an exhausted state, which can be overcome by knocking out the specific target, in this case CD70.

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CD70 identifies donor derived alloreactive T cells in severe acute Graft vs Host Disease post allogeneic SCT

Project description:Graft-versus-host disease (GvHD) remains a major challenge post allogeneic hematopoietic stem cell transplantation (allo-HSCT) and understanding its immunopathology is crucial for effective therapeutic intervention. Here we investigated the significance of CD70, a co-stimulatory molecule, in the context of aGvHD. CD70 was found to be transiently expressed on activated T cells during early immune reconstitution post-transplantation but persisted longer in aGvHD. Our findings illustrate that CD70+ T cells are characterized by upregulated activation receptors and enhanced cytokine production, while displaying signs of exhaustion. Remarkably, CD70+ T cells expressed chemokine receptors CCR4 and CCR6 and were actively recruited to inflamed tissues, implicating them in aGvHD pathogenesis. The chromatin at transcription factor MGA and NFAT5 loci was found to be selectively altered upon allo-antigenic stimulation in CD70+ T cells ex-vivo. Gene transcriptions of Toll-like receptors and MAPK signalling pathway were also found to differ in CD70+ and CD70- T cells of aGvHD patients. Insights into the clonality and antigen specificity of CD70+ T cell populations revealed potential novel antigenic targets. Further blocking CD70 in allogeneic T cells from aGvHD patients primed with autologous antigen presenting cells prior to HSCT demonstrated that anti-CD70 antibody reduced T cell proliferation and cytokine production. These findings implicate CD70 as a potential therapeutic target to modulate T cell responses and mitigate aGvHD. Targeting the CD70-CD27 co-stimulation pathway holds promise for prophylactic treatment.

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Transcription profiling by array of mouse wild type or CD27-/- OT-I T cells are stimulated with artficial antigen presenting cell lines expressing CD70 and/or CD80

Project description:WT or CD27-/- OT-I T cells are stimulated in vitro with artficial antigen presenting cell (aAPC) lines expressing CD70 and/or CD80 for 2, 4, 8 or 14 hours.

2010-09-29 | E-NCMF-38 | biostudies-arrayexpress

Analysis of CD70 wild type or CD70 knock out CD70-specific nanoCAR T cells [RNA-Seq]

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2024-06-17 | GSE265937 | GEO

Proteomic identification of anti-tetanus toxoid antibodies from human serum (HD1)

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Transcriptomic analysis of human B cell responses to vaccination

Project description:Analysis of the gene expression profiles of naÃ¯ve B cells, resting memory B cells (MBCs), activated B cells (ABCs) and antibody-secreting cells (ASCs) isolated from peripheral blood one week following influenza vaccination. Upon antigen exposure B cells eventually bifurcate into two distinct lineages, plasmablasts and memory B cells. We previously reported that plasmablasts or antibody-secreting cells (ASCs) could be transiently detected in blood shortly after infection or vaccination of humans. Here, we define the phenotype and the transcriptional program of a novel human antigen-specific B cell subset, referred to as activated B cells (ABCs). ABCs do not spontaneously secrete antibodies and possess a unique transcriptional profile that distinguishes them from ASCs and resting memory B cells. Clonal lineages present among day 7 ABCs persisted in blood for up to three months post-influenza immunization indicating that ABCs may be destined to join the long-term memory B cell pool. ABCs and ASCs can be clearly distinguished in blood following influenza and Ebola virus infections. Interrogating ABCs will expand our understanding of the differentiation, maturation and longevity of human B cell responses. Total RNA was isolated from 10,000 cells of each population.

2015-12-31 | E-GEOD-68245 | biostudies-arrayexpress

The B Cell Repertoire in Multiple Sclerosis Reveals Molecular Mimicry between EBNA1 and GlialCAM

Project description:This data set contains the mass spectrometry raw files for the paper The B Cell Repertoire in Multiple Sclerosis Reveals Molecular Mimicry between EBNA1 and GlialCAM. In multiple sclerosis (MS) intrathecal B lymphocytes are directly involved in inflammation and secrete oligoclonal immunoglobulin. However, our understanding of their phenotype, function, and antigen-specificity in MS is incomplete. Molecular mimicry to viruses and self-antigens could be a trigger of autoimmunity. Here we describe phenotypic differences of B cells in blood and cerebro-spinal fluid (CSF) and predominantly implicate plasmablasts in MS pathogenesis. Single-cell paired-chain antibody repertoire sequencing in blood and CSF suggests ongoing intrathecal somatic hypermutation and antigen-specific clonal expansion of intrathecal plasmablasts. The presence of these antibodies was verified using mass spectrometry sequencing of the IgGs isolated from CSF. Selected CSF-derived antibodies were tested against a spectrum of viruses implicated in MS pathogenesis. Antibody MS39p2w174 binds Epstein-Barr Virus (EBV) transcription factor EBNA1 and cross-reacts to the glial cellular adhesion molecule GlialCAM, which is facilitated by serine-phosphorylation. EBNA1 peptide immunization aggravates the mouse model of MS. EBNA1-GlialCAM cross-reactive antibodies are more prevalent in MS patients than in healthy controls. Together, our results suggest that anti-EBNA1- antibodies cross-react with GlialCAM and contribute to MS pathology. This dataset contains the RAW files for the CSF isolated IgGs.

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