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ABSTRACT:
PROVIDER: PRJNA728136 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Extrafollicular IgD+ B cells Generate IgE Antibody Secreting Cells in the Nasal Mucosa
| PRJNA729498 | ENA
Project description:Here we describe the dynamics underlying the generation of IgE-antibody secreting cells (ASC) in human nasal polyps (NP), mucosal tissues rich in ASC without germinal centers (GC). Using VH next generation sequencing, we identified an extrafollicular (EF) mucosal IgD+ naïve-like intermediate B cell population with high connectivity to the mucosal IgE ASC. Mucosal IgD+ B cells, express germline epsilon transcripts and predominantly co-express IgM. However, a small but significant fraction co-express IgG or IgA instead which also show connectivity to ASC IgE. Phenotypically, NP IgD+ B cells display an activated profile and molecular evidence of BCR engagement. Transcriptionally, mucosal IgD+ B cells reveal an intermediate profile between naïve B cells and ASC. Single cell IgE ASC analysis demonstrates lower mutational frequencies relative to IgG, IgA, and IgD ASC consistent with IgE ASC derivation from mucosal IgD+ B cell with low mutational load. In conclusion, we describe a novel mechanism of GC-independent, extrafollicular IgE ASC formation at the nasal mucosa whereby activated IgD+ naïve B cells locally undergo direct and indirect (through IgG and IgA), IgE class-switch.
2021-05-13 | GSE174349 | GEO
Project description:Here we investigate the transcriptional landscapes of nasal polyp IgD+ (naïve-like) B cells, nasal polyp ASC, and blood naïve B cells using RNA-seq. These data found that nasal polypP IgD+ naïve-like B cells are activated and similar to nasal polyp ASC and distinct from circulating B cells in the blood.
2021-05-20 | GSE174681 | GEO
Project description:Basophils are blood leukocytes associated to Th2 responses and allergy reactions primarily through the IgE bound to their surface throught the Fc Epsilon hifh affinity receptor. Soluble IgD is an enigmatic antibody isotype whose function remains elusive. We have characterised the presence of this antibody isotype on the surface of basophils where we hypothesise that it plays a role in Th2 responses and allergy reactions.
2018-12-31 | GSE115296 | GEO
Project description:This pilot study is a double-blinded, randomized controlled, two-centre trial in which subjects will receive 4 to 8 (subcutaneous administered) doses of medication (Omalizumab or placebo) (dose and dosing interval calculated on body weight and baseline total serum IgE). During the treatment period and follow-up, the clinical efficacy of the treatment will be assessed by evaluation of symptoms, Quality of Life questionnaire, morning Peak Expiratory Flow measurement, smell test, nasal endoscopy, CT-scan, peak nasal inspiratory flow and spirometry. Biological activity will be evaluated by measuring peripheral and local (in serum, in nasal secretions, biopsies) markers of inflammation.
Study hypothesis
1. Evaluation of the efficacy and safety of anti-IgE (Omalizumab) in patients with nasal polyposis and comorbid asthma.
2. Exploration of anti-IgE effects on local and systemic metabolism of IgE in nasal polyposis
3. Clinical assessment of the IgE theory in the pathogenesis of nasal polyps
| 2109692 | ecrin-mdr-crc
Project description:The airway mucociliary epithelium is consituted of three main cell types : columnar ciliated plus secretory cells and basal cells. Columnar cells are represented by a great majority of ciliated cells. We used Cell sorting by FACSaria to separate basal cells from ciliated and secreting columnar cells. Then, we performed microRNA high throughput sequencing to investigate the specific signature of microRNA of basal and columnar cells. miRNAs high throughput sequencing profiling of human nasal mucosa: basals cells (B) and columnars (C) cells for 3 donors.
2011-06-06 | E-GEOD-22145 | biostudies-arrayexpress
Project description:An autoimmune B cell origin for childhood idiopathic nephrotic syndrome (INS) is predicted based on the efficacy of rituximab (RTX) at maintaining long-term remission from proteinuria. Knowledge regarding the nature of the culprit B cell response is very limited. In particular, no transcriptomics work has been performed to evaluate the B cell response in INS. Using single-cell RNA-sequencing (scRNAseq) on peripheral blood mononuclear cells (PBMC) isolated from four affected children with active INS and four age/sex-matched health controls (HC), we demonstrate that a B cell transcriptional program poised for effector functions represents the major immune perturbation in the blood of children with active INS. We show that this nephrotic B cell signature is conferred by the engagement of memory B cells through an extrafollicular developmental route defined by expression of the interfollicular-homing gene GPR183 and the expansion of atypical B cells and marginal zone-like B cells. Moreover, we show that genes involved in APRIL signaling, which promotes extrafollicular antibody-secreting cell development, were substantially upregulated in B cells, monocytes, and dendritic cells from INS children. Collectively, our study provides evidence for an extrafollicular origin for humoral immunity in active INS.
2023-10-29 | GSE233275 | GEO
Project description:This study is a double-blinded, randomized, placebo controlled, multi-center trial in which 120 subjects with nasal polyposis (NP) will be treated during 20 days with oral corticosteroids (OCS) in decreasing doses or oral doxycyclin (ODOX) or placebo. At each visit the clinical and the biological activity will be assessed by nasal peak inspiratory flow (nPIF), symptoms, olfactory test, endoscopic evaluation of nasal polyps, peripheral eosinophil levels and markers of inflammation IL-5, IL-5 receptor alpha, ECP, TGFβ1, IgE and specific IgE in serum and nasal secretion.
| 2040498 | ecrin-mdr-crc
Project description:Bone marrow plasma cells (BMPC) are the correlate of humoral immunity, consistently releasing antibodies into the bloodstream. It remains unclear if BMPC reflect different activation environments or maturation of their precursors. Here we define human BMPC heterogeneity and track the recruitment of antibody-secreting cells (ASC) from SARS-CoV-2 vaccine immune reactions to the bone marrow (BM). Trajectories based on single-cell transcriptomes and repertoires of peripheral and BM ASC reveal sequential colonisation of BMPC compartments. In activated B cells, IL-21 suppresses CD19 expression, indicating that CD19low-BMPC are derived from follicular, while CD19high-BMPC originate from extrafollicular immune reactions. In primary immune reactions, both CD19low- and CD19high-BMPC compartments are populated. In secondary immune reactions, most BMPC are recruited to CD19high-BMPC compartments, reflecting their origin from extrafollicular reactivations of memory B cells. A pattern also observed in vaccinated-convalescent individuals and upon diphtheria/tetanus/pertussis recall-vaccination. Thus, BMPC diversity reflects the evolution of a given humoral immune response.
2024-04-16 | GSE253857 | GEO
Project description:Bone marrow plasma cells (BMPC) are the correlate of humoral immunity, consistently releasing antibodies into the bloodstream. It remains unclear if BMPC reflect different activation environments or maturation of their precursors. Here we define human BMPC heterogeneity and track the recruitment of antibody-secreting cells (ASC) from SARS-CoV-2 vaccine immune reactions to the bone marrow (BM). Trajectories based on single-cell transcriptomes and repertoires of peripheral and BM ASC reveal sequential colonisation of BMPC compartments. In activated B cells, IL-21 suppresses CD19 expression, indicating that CD19low-BMPC are derived from follicular, while CD19high-BMPC originate from extrafollicular immune reactions. In primary immune reactions, both CD19low- and CD19high-BMPC compartments are populated. In secondary immune reactions, most BMPC are recruited to CD19high-BMPC compartments, reflecting their origin from extrafollicular reactivations of memory B cells. A pattern also observed in vaccinated-convalescent individuals and upon diphtheria/tetanus/pertussis recall-vaccination. Thus, BMPC diversity reflects the evolution of a given humoral immune response.
2024-04-16 | GSE252959 | GEO