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  1. Article ; Online: IFN-I inducible

    Vuillier, Françoise / Li, Zhi / Black, Iain / Cruciani, Melania / Rubino, Erminia / Michel, Frédérique / Pellegrini, Sandra

    Frontiers in immunology

    2022  Volume 13, Page(s) 939907

    Abstract: Regulation of innate immune responses is essential for maintenance of immune homeostasis and development of an appropriate immunity against microbial infection. We show here ... ...

    Abstract Regulation of innate immune responses is essential for maintenance of immune homeostasis and development of an appropriate immunity against microbial infection. We show here that
    MeSH term(s) Adenosine Deaminase/metabolism ; Antibodies ; Antiviral Agents ; HeLa Cells ; Humans ; Immunity, Innate ; Interferon Type I ; MicroRNAs/genetics ; Protein Isoforms ; RNA, Double-Stranded ; RNA-Binding Proteins/metabolism ; Transcription Factors/genetics ; Tripartite Motif Proteins/genetics ; Ubiquitin-Protein Ligases/genetics
    Chemical Substances Antibodies ; Antiviral Agents ; Interferon Type I ; MicroRNAs ; Protein Isoforms ; RNA, Double-Stranded ; RNA-Binding Proteins ; Transcription Factors ; Tripartite Motif Proteins ; TRIM25 protein, human (EC 2.3.2.27) ; Ubiquitin-Protein Ligases (EC 2.3.2.27) ; ADAR protein, human (EC 3.5.4.37) ; Adenosine Deaminase (EC 3.5.4.4)
    Language English
    Publishing date 2022-07-22
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2606827-8
    ISSN 1664-3224 ; 1664-3224
    ISSN (online) 1664-3224
    ISSN 1664-3224
    DOI 10.3389/fimmu.2022.939907
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Two common disease-associated TYK2 variants impact exon splicing and TYK2 dosage.

    Li, Zhi / Rotival, Maxime / Patin, Etienne / Michel, Frédérique / Pellegrini, Sandra

    PloS one

    2020  Volume 15, Issue 1, Page(s) e0225289

    Abstract: TYK2 belongs to the JAK protein tyrosine kinase family and mediates signaling of numerous antiviral and immunoregulatory cytokines (type I and type III IFNs, IL-10, IL-12, IL-22, IL-23) in immune and non-immune cells. After many years of genetic ... ...

    Abstract TYK2 belongs to the JAK protein tyrosine kinase family and mediates signaling of numerous antiviral and immunoregulatory cytokines (type I and type III IFNs, IL-10, IL-12, IL-22, IL-23) in immune and non-immune cells. After many years of genetic association studies, TYK2 is recognized as a susceptibility gene for some inflammatory and autoimmune diseases (AID). Seven TYK2 variants have been associated with AIDs in Europeans, and establishing their causality remains challenging. Previous work showed that a protective variant (P1104A) is hypomorphic and also a risk allele for mycobacterial infection. Here, we have studied two AID-associated common TYK2 variants: rs12720270 located in intron 7 and rs2304256, a non-synonymous variant in exon 8 that causes a valine to phenylalanine substitution (c.1084 G > T, Val362Phe). We found that this amino acid substitution does not alter TYK2 expression, catalytic activity or ability to relay signaling in EBV-B cell lines or in reconstituted TYK2-null cells. Based on in silico predictions that these variants may impact splicing of exon 8, we: i) analyzed TYK2 transcripts in genotyped EBV-B cells and in CRISPR/Cas9-edited cells, ii) measured splicing using minigene assays, and iii) performed eQTL (expression quantitative trait locus) analysis of TYK2 transcripts in primary monocytes and whole blood cells. Our results reveal that the two variants promote the inclusion of exon 8, which, we demonstrate, is essential for TYK2 binding to cognate receptors. In addition and in line with GTEx (Genetic Tissue Expression) data, our eQTL results show that rs2304256 mildly enhances TYK2 expression in whole blood. In all, these findings suggest that these TYK2 variants are not neutral but instead have a potential impact in AID.
    MeSH term(s) Alleles ; Amino Acid Substitution/genetics ; Autoimmune Diseases/blood ; Autoimmune Diseases/genetics ; Autoimmune Diseases/pathology ; B-Lymphocytes/metabolism ; B-Lymphocytes/pathology ; Cytokines/chemistry ; Cytokines/genetics ; Gene Expression Regulation/genetics ; Genetic Association Studies ; Genetic Predisposition to Disease ; Genotype ; Humans ; Inflammation/blood ; Inflammation/genetics ; Inflammation/pathology ; Phenylalanine/genetics ; Polymorphism, Single Nucleotide/genetics ; Quantitative Trait Loci/genetics ; TYK2 Kinase/blood ; TYK2 Kinase/genetics
    Chemical Substances Cytokines ; Phenylalanine (47E5O17Y3R) ; TYK2 Kinase (EC 2.7.10.2) ; TYK2 protein, human (EC 2.7.10.2)
    Language English
    Publishing date 2020-01-21
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0225289
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  3. Article ; Online: Expression of endogenous retroviruses reflects increased usage of atypical enhancers in T cells.

    Azébi, Saliha / Batsché, Eric / Michel, Frédérique / Kornobis, Etienne / Muchardt, Christian

    The EMBO journal

    2019  Volume 38, Issue 12

    Abstract: Several autoimmune diseases including multiple sclerosis (MS) cause increased transcription of endogenous retroviruses (HERVs) normally repressed by heterochromatin. In parallel, HERV-derived sequences were reported to drive gene expression. Here, we ... ...

    Abstract Several autoimmune diseases including multiple sclerosis (MS) cause increased transcription of endogenous retroviruses (HERVs) normally repressed by heterochromatin. In parallel, HERV-derived sequences were reported to drive gene expression. Here, we have examined a possible link between promoter and enhancer divergent transcription and the production of HERV transcripts. We find that HERV-derived sequences are in general counter-selected at regulatory regions, a counter-selection that is strongest in brain tissues while very moderate in stem cells. By exposing T cells to the pesticide dieldrin, we further found that a series of HERV-driven enhancers otherwise active only at stem cell stages can be reactivated by stress. This in part relies on peptidylarginine deiminase activity, possibly participating in the reawakening of silenced enhancers. Likewise, usage of HERV-driven enhancers was increased in myelin-reactive T cells from patients with MS, correlating with activation of nearby genes at several sites. Altogether, we propose that HERV-driven enhancers constitute a reservoir of auxiliary enhancers transiently induced by stress while chronically active in diseases like MS.
    MeSH term(s) Adult ; Case-Control Studies ; Cells, Cultured ; Endogenous Retroviruses/genetics ; Female ; Gene Expression Regulation, Viral/physiology ; Humans ; Jurkat Cells ; Male ; Middle Aged ; Multiple Sclerosis/genetics ; Multiple Sclerosis/immunology ; Multiple Sclerosis/metabolism ; Multiple Sclerosis/virology ; Regulatory Sequences, Nucleic Acid/genetics ; T-Lymphocytes/metabolism ; T-Lymphocytes/pathology
    Language English
    Publishing date 2019-05-08
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 586044-1
    ISSN 1460-2075 ; 0261-4189
    ISSN (online) 1460-2075
    ISSN 0261-4189
    DOI 10.15252/embj.2018101107
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Central Role of Macrophages and Nucleic Acid Release in Myasthenia Gravis Thymus.

    Payet, Cloé A / You, Axel / Fayet, Odessa-Maud / Hemery, Edouard / Truffault, Frederique / Bondet, Vincent / Duffy, Darragh / Michel, Frédérique / Fadel, Elie / Guihaire, Julien / Demeret, Sophie / Berrih-Aknin, Sonia / Le Panse, Rozen

    Annals of neurology

    2023  Volume 93, Issue 4, Page(s) 643–654

    Abstract: Objective: Myasthenia gravis (MG) is a neuromuscular disease mediated by antibodies against the acetylcholine receptor (AChR). The thymus plays a primary role in AChR-MG and is characterized by a type I interferon (IFN) signature linked to IFN-β. We ... ...

    Abstract Objective: Myasthenia gravis (MG) is a neuromuscular disease mediated by antibodies against the acetylcholine receptor (AChR). The thymus plays a primary role in AChR-MG and is characterized by a type I interferon (IFN) signature linked to IFN-β. We investigated if AChR-MG was characterized by an IFN-I signature in the blood, and further investigated the chronic thymic IFN-I signature.
    Methods: Serum levels of IFN-β and IFN-α subtypes, and mRNA expression for IFN-I subtypes and IFN-stimulated genes in peripheral mononuclear blood cells (PBMCs) were analyzed. The contribution of endogenous nucleic acids in thymic expression of IFN-I subtypes was investigated in human thymic epithelial cell cultures and the mouse thymus. By immunohistochemistry, thymic CD68
    Results: No IFN-I signature was observed in the periphery emphasizing that the IFN-I signature is restricted to the MG thymus. Molecules mimicking endogenous dsDNA signalization (Poly(dA:dT) and 2'3'-cGAMP), or dexamethasone-induced necrotic thymocytes increased IFN-β and α-AChR expression by thymic epithelial cells, and in the mouse thymus. A significant decrease in thymic macrophages was demonstrated in AChR-MG. In mice, a decrease in thymic macrophages led to an increase of necrotic thymocytes associated with IFN-β and α-AChR expression.
    Interpretation: These results suggest that the decrease of thymic macrophages in AChR-MG impairs the elimination of apoptotic thymocytes favoring the release of endogenous nucleic acids from necrotic thymocytes. In this inflammatory context, thymic epithelial cells may overexpress IFN-β, which specifically induces α-AChR, resulting in self-sensitization and thymic changes leading to AChR-MG. ANN NEUROL 2023;93:643-654.
    MeSH term(s) Humans ; Mice ; Animals ; Nucleic Acids ; Myasthenia Gravis ; Thymus Gland/metabolism ; Receptors, Cholinergic ; Macrophages/metabolism
    Chemical Substances Nucleic Acids ; Receptors, Cholinergic
    Language English
    Publishing date 2023-01-25
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 80362-5
    ISSN 1531-8249 ; 0364-5134
    ISSN (online) 1531-8249
    ISSN 0364-5134
    DOI 10.1002/ana.26590
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Type I interferon-enhanced IL-10 expression in human CD4 T cells is regulated by STAT3, STAT2, and BATF transcription factors.

    Govender, Umeshree / Corre, Béatrice / Bourdache, Yasmine / Pellegrini, Sandra / Michel, Frédérique

    Journal of leukocyte biology

    2017  Volume 101, Issue 5, Page(s) 1181–1190

    Abstract: Type I IFN can exert pro- and anti-inflammatory activities in the immune system. Here, we have investigated the mechanism by which IFN-α enhances early expression of the anti-inflammatory cytokine IL-10 in human ... ...

    Abstract Type I IFN can exert pro- and anti-inflammatory activities in the immune system. Here, we have investigated the mechanism by which IFN-α enhances early expression of the anti-inflammatory cytokine IL-10 in human CD45RA
    MeSH term(s) Antibodies/pharmacology ; Basic-Leucine Zipper Transcription Factors/antagonists & inhibitors ; Basic-Leucine Zipper Transcription Factors/genetics ; Basic-Leucine Zipper Transcription Factors/immunology ; Binding Sites ; CD28 Antigens/antagonists & inhibitors ; CD28 Antigens/genetics ; CD28 Antigens/immunology ; CD3 Complex/genetics ; CD3 Complex/immunology ; CD4-Positive T-Lymphocytes/cytology ; CD4-Positive T-Lymphocytes/drug effects ; CD4-Positive T-Lymphocytes/immunology ; Cycloheximide/pharmacology ; Enhancer Elements, Genetic ; Gene Expression Regulation ; Humans ; Interferon-alpha/immunology ; Interferon-alpha/pharmacology ; Interleukin-10/genetics ; Interleukin-10/immunology ; Phosphorylation/drug effects ; Primary Cell Culture ; Protein Binding ; Protein Isoforms/genetics ; Protein Isoforms/immunology ; RNA, Small Interfering/genetics ; RNA, Small Interfering/metabolism ; STAT1 Transcription Factor/antagonists & inhibitors ; STAT1 Transcription Factor/genetics ; STAT1 Transcription Factor/immunology ; STAT2 Transcription Factor/antagonists & inhibitors ; STAT2 Transcription Factor/genetics ; STAT2 Transcription Factor/immunology ; STAT3 Transcription Factor/antagonists & inhibitors ; STAT3 Transcription Factor/genetics ; STAT3 Transcription Factor/immunology ; Signal Transduction
    Chemical Substances Antibodies ; BATF protein, human ; Basic-Leucine Zipper Transcription Factors ; CD28 Antigens ; CD3 Complex ; IL10 protein, human ; Interferon-alpha ; Protein Isoforms ; RNA, Small Interfering ; STAT1 Transcription Factor ; STAT1 protein, human ; STAT2 Transcription Factor ; STAT2 protein, human ; STAT3 Transcription Factor ; STAT3 protein, human ; Interleukin-10 (130068-27-8) ; Cycloheximide (98600C0908)
    Language English
    Publishing date 2017-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 605722-6
    ISSN 1938-3673 ; 0741-5400
    ISSN (online) 1938-3673
    ISSN 0741-5400
    DOI 10.1189/jlb.2A0416-187RR
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  6. Article: Human Ubiquitin-Specific Peptidase 18 Is Regulated by microRNAs

    Rubino, Erminia / Cruciani, Melania / Tchitchek, Nicolas / Le Tortorec, Anna / Rolland, Antoine D / Veli, Önay / Vallet, Leslie / Gaggi, Giulia / Michel, Frédérique / Dejucq-Rainsford, Nathalie / Pellegrini, Sandra

    Frontiers in genetics

    2021  Volume 11, Page(s) 627007

    Abstract: Ubiquitin-specific peptidase 18 (USP18) acts as gatekeeper of type I interferon (IFN) responses by binding to the IFN receptor subunit IFNAR2 and preventing activation of the downstream JAK/STAT pathway. In any given cell type, the level of USP18 is a ... ...

    Abstract Ubiquitin-specific peptidase 18 (USP18) acts as gatekeeper of type I interferon (IFN) responses by binding to the IFN receptor subunit IFNAR2 and preventing activation of the downstream JAK/STAT pathway. In any given cell type, the level of USP18 is a key determinant of the output of IFN-stimulated transcripts. How the baseline level of USP18 is finely tuned in different cell types remains ill defined. Here, we identified microRNAs (miRNAs) that efficiently target
    Language English
    Publishing date 2021-02-03
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2606823-0
    ISSN 1664-8021
    ISSN 1664-8021
    DOI 10.3389/fgene.2020.627007
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  7. Article ; Online: Altered Immune Phenotypes and

    Devi-Marulkar, Priyanka / Moraes-Cabe, Carolina / Campagne, Pascal / Corre, Béatrice / Meghraoui-Kheddar, Aida / Bondet, Vincent / Llibre, Alba / Duffy, Darragh / Maillart, Elisabeth / Papeix, Caroline / Pellegrini, Sandra / Michel, Frédérique

    Frontiers in immunology

    2021  Volume 12, Page(s) 628375

    Abstract: Background: Interferon beta (IFN: Aim: To determine a combination of cellular and molecular blood signatures associated with the efficacy of IFN: Methods: The immune status of 40 RRMS patients, 15 of whom were untreated and 25 that received IFN: ...

    Abstract Background: Interferon beta (IFN
    Aim: To determine a combination of cellular and molecular blood signatures associated with the efficacy of IFN
    Methods: The immune status of 40 RRMS patients, 15 of whom were untreated and 25 that received IFN
    Results: Clinical responders and non-responders displayed similar plasma levels of IFN
    MeSH term(s) Adult ; CD4-Positive T-Lymphocytes/immunology ; CD4-Positive T-Lymphocytes/metabolism ; Case-Control Studies ; Female ; Genetic Variation ; HLA-DQ beta-Chains/genetics ; HLA-DQ beta-Chains/immunology ; Humans ; Immunologic Factors/therapeutic use ; Interferon Regulatory Factors/genetics ; Interferon Regulatory Factors/metabolism ; Interferon beta-1a/therapeutic use ; Male ; Middle Aged ; Multiple Sclerosis, Relapsing-Remitting/blood ; Multiple Sclerosis, Relapsing-Remitting/drug therapy ; Multiple Sclerosis, Relapsing-Remitting/genetics ; Multiple Sclerosis, Relapsing-Remitting/immunology ; Phenotype ; Treatment Failure ; Young Adult
    Chemical Substances HLA-DQ beta-Chains ; HLA-DQB1 antigen ; Immunologic Factors ; Interferon Regulatory Factors ; Interferon beta-1a (XRO4566Q4R)
    Language English
    Publishing date 2021-05-25
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2606827-8
    ISSN 1664-3224 ; 1664-3224
    ISSN (online) 1664-3224
    ISSN 1664-3224
    DOI 10.3389/fimmu.2021.628375
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: CD28-mediated co-stimulation: a quantitative support for TCR signalling.

    Acuto, Oreste / Michel, Frédérique

    Nature reviews. Immunology

    2003  Volume 3, Issue 12, Page(s) 939–951

    MeSH term(s) Adaptor Proteins, Signal Transducing ; Animals ; CD28 Antigens/immunology ; Carrier Proteins/immunology ; Cell Cycle/immunology ; Humans ; Lymphocyte Activation/immunology ; Membrane Proteins/immunology ; Mice ; Phosphatidylinositol 3-Kinases/immunology ; Phosphoproteins/immunology ; Signal Transduction/immunology ; T-Lymphocytes/immunology
    Chemical Substances Adaptor Proteins, Signal Transducing ; CD28 Antigens ; Carrier Proteins ; LAT protein, human ; Lat protein, mouse ; Membrane Proteins ; Phosphoproteins ; Phosphatidylinositol 3-Kinases (EC 2.7.1.-)
    Language English
    Publishing date 2003-12
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2062776-2
    ISSN 1474-1741 ; 1474-1733
    ISSN (online) 1474-1741
    ISSN 1474-1733
    DOI 10.1038/nri1248
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  9. Article: Tailoring T-cell receptor signals by proximal negative feedback mechanisms.

    Acuto, Oreste / Di Bartolo, Vincenzo / Michel, Frédérique

    Nature reviews. Immunology

    2008  Volume 8, Issue 9, Page(s) 699–712

    Abstract: The T-cell receptor (TCR) signalling machinery is central in determining the response of a T cell (establishing immunity or tolerance) following exposure to antigen. This process is made difficult by the narrow margin of self and non-self discrimination, ...

    Abstract The T-cell receptor (TCR) signalling machinery is central in determining the response of a T cell (establishing immunity or tolerance) following exposure to antigen. This process is made difficult by the narrow margin of self and non-self discrimination, and by the complexity of the genetic programmes that are induced for each outcome. Recent studies have identified novel negative feedback mechanisms that are rapidly induced by TCR engagement and that have key roles in the regulation of signal triggering and propagation. In vitro and in vivo data suggest that they are important in determining ligand discrimination by the TCR and in regulating signal output in response to antigen.
    MeSH term(s) Adaptor Proteins, Signal Transducing/immunology ; Animals ; Feedback, Physiological ; Models, Immunological ; Phosphoric Monoester Hydrolases/metabolism ; Receptors, Antigen, T-Cell/immunology ; Signal Transduction/immunology
    Chemical Substances Adaptor Proteins, Signal Transducing ; Receptors, Antigen, T-Cell ; Phosphoric Monoester Hydrolases (EC 3.1.3.2)
    Language English
    Publishing date 2008-09
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2062776-2
    ISSN 1474-1741 ; 1474-1733
    ISSN (online) 1474-1741
    ISSN 1474-1733
    DOI 10.1038/nri2397
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  10. Article ; Online: Type I interferon potentiates T-cell receptor mediated induction of IL-10-producing CD4⁺ T cells.

    Corre, Béatrice / Perrier, Julie / El Khouri, Margueritte / Cerboni, Silvia / Pellegrini, Sandra / Michel, Frédérique

    European journal of immunology

    2013  Volume 43, Issue 10, Page(s) 2730–2740

    Abstract: Type I interferons (IFNs) have the dual ability to promote the development of the immune response and exert an anti-inflammatory activity. We analyzed the integrated effect of IFN-α, TCR signal strength, and CD28 costimulation on human CD4⁺ T-cell ... ...

    Abstract Type I interferons (IFNs) have the dual ability to promote the development of the immune response and exert an anti-inflammatory activity. We analyzed the integrated effect of IFN-α, TCR signal strength, and CD28 costimulation on human CD4⁺ T-cell differentiation into cell subsets producing the anti- and proinflammatory cytokines IL-10 and IFN-γ. We show that IFN-α boosted TCR-induced IL-10 expression in activated peripheral CD45RA⁺CD4⁺ T cells and in whole blood cultures. The functional cooperation between TCR and IFN-α efficiently occurred at low engagement of receptors. Moreover, IFN-α rapidly cooperated with anti-CD3 stimulation alone. IFN-α, but not IL-10, drove the early development of type I regulatory T cells that were mostly IL-10⁺ Foxp3⁻ IFN-γ⁻ and favored IL-10 expression in a fraction of Foxp3⁺ T cells. Our data support a model in which IFN-α costimulates TCR toward the production of IL-10 whose level can be amplified via an autocrine feedback loop.
    MeSH term(s) CD28 Antigens/immunology ; Cell Differentiation/immunology ; Cells, Cultured ; Feedback, Physiological ; Forkhead Transcription Factors/metabolism ; Humans ; Inflammation Mediators/metabolism ; Interferon-alpha/immunology ; Interferon-gamma/metabolism ; Interleukin-10/metabolism ; Leukocyte Common Antigens/metabolism ; Lymphocyte Activation ; Protein Binding ; Receptor Cross-Talk/immunology ; Receptors, Antigen, T-Cell/immunology ; Receptors, Antigen, T-Cell/metabolism ; Signal Transduction/immunology ; T-Lymphocyte Subsets/immunology ; T-Lymphocytes, Regulatory/immunology
    Chemical Substances CD28 Antigens ; FOXP3 protein, human ; Forkhead Transcription Factors ; Inflammation Mediators ; Interferon-alpha ; Receptors, Antigen, T-Cell ; Interleukin-10 (130068-27-8) ; Interferon-gamma (82115-62-6) ; Leukocyte Common Antigens (EC 3.1.3.48)
    Language English
    Publishing date 2013-10
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 120108-6
    ISSN 1521-4141 ; 0014-2980
    ISSN (online) 1521-4141
    ISSN 0014-2980
    DOI 10.1002/eji.201242977
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