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Autoimmunity in Down’s syndrome via cytokines, CD4 T cells and CD11c+ B cells
An autoimmune-prone state of steady-state cytokinopathy, hyperactivated CD4 T cells and ongoing B cell activation contributes to a breach in immune tolerance in individuals with Down’s syndrome.
- Louise Malle
- , Roosheel S. Patel
- & Dusan Bogunovic
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Article
| Open AccessNovel antigen-presenting cell imparts Treg-dependent tolerance to gut microbiota
Single-cell transcriptomic and epigenetic analysis has enabled the identification of Thetis cells, a class of RORγt+ antigen-presenting cells with a key role in the differentiation of commensal microbiota-induced peripheral regulatory T cells.
- Blossom Akagbosu
- , Zakieh Tayyebi
- & Chrysothemis C. Brown
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Article
| Open AccessDysregulated naive B cells and de novo autoreactivity in severe COVID-19
Single-cell B cell repertoire analysis identifies the expansion of a naive-derived population of antibody-secreting cells contributing to de novo autoreactivity in patients with severe COVID-19 and those with post-COVID symptoms.
- Matthew C. Woodruff
- , Richard P. Ramonell
- & Ignacio Sanz
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Article
| Open AccessTLR7 gain-of-function genetic variation causes human lupus
The missense TLR7Y264H gain-of-function genetic variation causes systemic lupus erythematosus in humans and mice.
- Grant J. Brown
- , Pablo F. Cañete
- & Carola G. Vinuesa
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Article |
Establishment of fetomaternal tolerance through glycan-mediated B cell suppression
Pathways of glycan-mediated B cell suppression during pregnancy are important for promoting fetomaternal tolerance.
- G. Rizzuto
- , J. F. Brooks
- & A. Erlebacher
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Article |
Local immune response to food antigens drives meal-induced abdominal pain
In mice, oral tolerance to food antigens can break down after enteric infection, and this leads to food-induced pain resembling irritable bowel syndrome in humans.
- Javier Aguilera-Lizarraga
- , Morgane V. Florens
- & Guy E. Boeckxstaens
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Letter |
Genome-wide analysis identifies NR4A1 as a key mediator of T cell dysfunction
Tolerant T cells display characteristic patterns of gene expression and epigenetics that are distinct from other types of T cells and are orchestrated by the transcription factor NR4A1.
- Xindong Liu
- , Yun Wang
- & Chen Dong
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Letter |
Single-cell mapping of the thymic stroma identifies IL-25-producing tuft epithelial cells
A comprehensive characterization of the thymic stroma identifies a tuft-cell-like thymic epithelial cell population that is critical for shaping the immune niche in the thymus.
- Chamutal Bornstein
- , Shir Nevo
- & Ido Amit
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Letter |
Pancreatic islets communicate with lymphoid tissues via exocytosis of insulin peptides
A sensitive T cell tracking assay reveals immunogenic activity of specific catabolized peptide fragments of insulin and their effects on T cell activity in lymph nodes, highlighting communication between pancreatic islets and lymphoid tissue.
- Xiaoxiao Wan
- , Bernd H. Zinselmeyer
- & Emil R. Unanue
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Letter |
c-MAF-dependent regulatory T cells mediate immunological tolerance to a gut pathobiont
The transcription factor c-MAF is required for the generation of Helicobacter-specific regulatory T cells that selectively restrain pro-inflammatory TH17 cells; the absence of c-MAF in mouse regulatory T cells results in pathobiont-dependent inflammatory bowel disease.
- Mo Xu
- , Maria Pokrovskii
- & Dan R. Littman
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Letter |
Themis sets the signal threshold for positive and negative selection in T-cell development
This work shows that the Themis protein has a critical role in positive and negative thymocyte selection by dampening responses to low-affinity ligands but without affecting responses to high-affinity ligands, thus enabling positive selection of weakly self-reactive thymocytes.
- Guo Fu
- , Javier Casas
- & Nicholas R. J. Gascoigne
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News & Views |
Tolerating pregnancy
The activity of specific suppressive immune cells, some of which persist to aid subsequent pregnancies, helps to explain how a pregnant female's immune system tolerates fetal antigens inherited from the father. See Letter p.102
- Alexander G. Betz
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Letter |
Pregnancy imprints regulatory memory that sustains anergy to fetal antigen
Successful pregnancy requires immune tolerance against paternal antigens expressed by the fetus; here pregnancy is shown to stimulate the selective accumulation of maternal immune-suppressive regulatory T cells with fetal specificity that are retained post-partum, which may explain the protective benefits of prior pregnancy against pre-eclampsia and other complications in subsequent pregnancy.
- Jared H. Rowe
- , James M. Ertelt
- & Sing Sing Way
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Letter |
Endogenous antigen tunes the responsiveness of naive B cells but not T cells
Mature B cells encounter antigens during development that induce anergy or functional unresponsiveness; this large reservoir of dormant autoreactive B cells may serve as a pool of extended antibody specificity for purposes of protective immunity, as well as the source of pathogenic autoantibodies that characterize rheumatic diseases such as systemic lupus erythematosus.
- Julie Zikherman
- , Ramya Parameswaran
- & Arthur Weiss
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Outlook |
Treatment: In search of a booster shot
A plethora of therapies can keep the symptoms of allergy under control, but they can't cure. New research aims to prevent allergies from developing in the first place.
- Lauren Gravitz
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Letter |
Peripheral education of the immune system by colonic commensal microbiota
- Stephanie K. Lathrop
- , Seth M. Bloom
- & Chyi-Song Hsieh
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Letter |
Tumour hypoxia promotes tolerance and angiogenesis via CCL28 and Treg cells
- Andrea Facciabene
- , Xiaohui Peng
- & George Coukos
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News & Views |
Context is key in the gut
The vitamin-A metabolite retinoic acid normally favours immune tolerance in the gut. But in coeliac disease — an intestinal inflammatory disorder due to adverse reactivity to a dietary protein — it may do just the opposite. See Letter p.220
- Craig L. Maynard
- & Casey T. Weaver
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Letter |
Inhibition of follicular T-helper cells by CD8+ regulatory T cells is essential for self tolerance
Immune cells that recognize 'self' tissues need to be eliminated or controlled in order to prevent autoimmune diseases. Here, a T-cell population is delineated that is necessary to maintain self tolerance in mice. Genetic disruption of the inhibitory interaction between these CD8+ T cells and their target Qa-1+ follicular T-helper cells results in a lethal systemic-lupus-erythematosus-like autoimmune disease.
- Hye-Jung Kim
- , Bert Verbinnen
- & Harvey Cantor