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  1. Article ; Online: Identification of Tensin-3 as a MALT1 substrate that controls B cell adhesion and lymphoma dissemination.

    Juilland, Mélanie / Alouche, Nagham / Ubezzi, Ivana / Gonzalez, Montserrat / Rashid, Harun-Or / Scarpellino, Leonardo / Erdmann, Tabea / Grau, Michael / Lenz, Georg / Luther, Sanjiv A / Thome, Margot

    Proceedings of the National Academy of Sciences of the United States of America

    2023  Volume 120, Issue 52, Page(s) e2301155120

    Abstract: The protease MALT1 promotes lymphocyte activation and lymphomagenesis by cleaving a limited set of cellular substrates, most of which control gene expression. Here, we identified the integrin-binding scaffold protein Tensin-3 as a MALT1 substrate in ... ...

    Abstract The protease MALT1 promotes lymphocyte activation and lymphomagenesis by cleaving a limited set of cellular substrates, most of which control gene expression. Here, we identified the integrin-binding scaffold protein Tensin-3 as a MALT1 substrate in activated human B cells. Activated B cells lacking Tensin-3 showed decreased integrin-dependent adhesion but exhibited comparable NF-κB1 and Jun N-terminal kinase transcriptional responses. Cells expressing a noncleavable form of Tensin-3, on the other hand, showed increased adhesion. To test the role of Tensin-3 cleavage in vivo, mice expressing a noncleavable version of Tensin-3 were generated, which showed a partial reduction in the T cell-dependent B cell response. Interestingly, human diffuse large B cell lymphomas and mantle cell lymphomas with constitutive MALT1 activity showed strong constitutive Tensin-3 cleavage and a decrease in uncleaved Tensin-3 levels. Moreover, silencing of Tensin-3 expression in MALT1-driven lymphoma promoted dissemination of xenografted lymphoma cells to the bone marrow and spleen. Thus, MALT1-dependent Tensin-3 cleavage reveals a unique aspect of the function of MALT1, which negatively regulates integrin-dependent B cell adhesion and facilitates metastatic spread of B cell lymphomas.
    MeSH term(s) Mice ; Humans ; Animals ; Adult ; Tensins/genetics ; Caspases/metabolism ; NF-kappa B/metabolism ; Cell Adhesion/genetics ; Neoplasm Proteins/genetics ; Neoplasm Proteins/metabolism ; Mucosa-Associated Lymphoid Tissue Lymphoma Translocation 1 Protein/genetics ; Mucosa-Associated Lymphoid Tissue Lymphoma Translocation 1 Protein/metabolism ; Lymphoma, Large B-Cell, Diffuse/genetics ; Integrins
    Chemical Substances Tensins ; Caspases (EC 3.4.22.-) ; NF-kappa B ; Neoplasm Proteins ; Mucosa-Associated Lymphoid Tissue Lymphoma Translocation 1 Protein (EC 3.4.22.-) ; Integrins ; MALT1 protein, human (EC 3.4.22.-)
    Language English
    Publishing date 2023-12-18
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2301155120
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Fine-tuning of MEK signaling is pivotal for limiting B and T cell activation.

    Houde, Nicolas / Beuret, Laurent / Bonaud, Amélie / Fortier-Beaulieu, Simon-Pierre / Truchon-Landry, Kim / Aoidi, Rifdat / Pic, Émilie / Alouche, Nagham / Rondeau, Vincent / Schlecht-Louf, Géraldine / Balabanian, Karl / Espéli, Marion / Charron, Jean

    Cell reports

    2022  Volume 38, Issue 2, Page(s) 110223

    Abstract: MEK1 and MEK2, the only known activators of ERK, are attractive therapeutic candidates for both cancer and autoimmune diseases. However, how MEK signaling finely regulates immune cell activation is only partially understood. To address this question, we ... ...

    Abstract MEK1 and MEK2, the only known activators of ERK, are attractive therapeutic candidates for both cancer and autoimmune diseases. However, how MEK signaling finely regulates immune cell activation is only partially understood. To address this question, we specifically delete Mek1 in hematopoietic cells in the Mek2 null background. Characterization of an allelic series of Mek mutants reveals the presence of distinct degrees of spontaneous B cell activation, which are inversely proportional to the levels of MEK proteins and ERK activation. While Mek1 and Mek2 null mutants have a normal lifespan, 1Mek1 and 1Mek2 mutants retaining only one functional Mek1 or Mek2 allele in hematopoietic cell lineages die from glomerulonephritis and lymphoproliferative disorders, respectively. This establishes that the fine-tuning of the ERK/MAPK pathway is critical to regulate B and T cell activation and function and that each MEK isoform plays distinct roles during lymphocyte activation and disease development.
    MeSH term(s) Alleles ; Animals ; B-Lymphocytes/metabolism ; Female ; Humans ; Lymphocyte Activation/genetics ; Lymphocyte Activation/physiology ; MAP Kinase Kinase 1/metabolism ; MAP Kinase Kinase 1/physiology ; MAP Kinase Kinase 2/genetics ; MAP Kinase Kinase 2/metabolism ; MAP Kinase Kinase 2/physiology ; MAP Kinase Signaling System/genetics ; MAP Kinase Signaling System/physiology ; Male ; Mice ; Mice, 129 Strain ; Mitogen-Activated Protein Kinase 1/metabolism ; Phosphorylation ; Signal Transduction/physiology ; T-Lymphocytes/metabolism
    Chemical Substances Mitogen-Activated Protein Kinase 1 (EC 2.7.11.24) ; MAP Kinase Kinase 1 (EC 2.7.12.2) ; MAP Kinase Kinase 2 (EC 2.7.12.2) ; Map2k1 protein, mouse (EC 2.7.12.2) ; Map2k2 protein, mouse (EC 2.7.12.2)
    Language English
    Publishing date 2022-01-12
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2649101-1
    ISSN 2211-1247 ; 2211-1247
    ISSN (online) 2211-1247
    ISSN 2211-1247
    DOI 10.1016/j.celrep.2021.110223
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Sec22b is a critical and nonredundant regulator of plasma cell maintenance.

    Bonaud, Amélie / Gargowitsch, Laetitia / Gilbert, Simon M / Rajan, Elanchezhian / Canales-Herrerias, Pablo / Stockholm, Daniel / Rahman, Nabila F / Collins, Mark O / Taskiran, Hakan / Hill, Danika L / Alloatti, Andres / Alouche, Nagham / Balor, Stéphanie / Soldan, Vanessa / Gillet, Daniel / Barbier, Julien / Bachelerie, Françoise / Smith, Kenneth G C / Jellusova, Julia /
    Bruhns, Pierre / Amigorena, Sebastian / Balabanian, Karl / Linterman, Michelle A / Peden, Andrew A / Espéli, Marion

    Proceedings of the National Academy of Sciences of the United States of America

    2023  Volume 120, Issue 2, Page(s) e2213056120

    Abstract: Despite the essential role of plasma cells in health and disease, the cellular mechanisms controlling their survival and secretory capacity are still poorly understood. Here, we identified the soluble N-ethylmaleimide-sensitive factor attachment protein ... ...

    Abstract Despite the essential role of plasma cells in health and disease, the cellular mechanisms controlling their survival and secretory capacity are still poorly understood. Here, we identified the soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) Sec22b as a unique and critical regulator of plasma cell maintenance and function. In the absence of Sec22b, plasma cells were hardly detectable and serum antibody titers were dramatically reduced. Accordingly,
    MeSH term(s) Mice ; Animals ; Plasma Cells/metabolism ; R-SNARE Proteins/metabolism ; SNARE Proteins/metabolism ; Endoplasmic Reticulum/metabolism ; Biological Transport
    Chemical Substances R-SNARE Proteins ; SNARE Proteins ; Sec22b protein, mouse
    Language English
    Publishing date 2023-01-03
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2213056120
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: FcγRIIb differentially regulates pre-immune and germinal center B cell tolerance in mouse and human.

    Espéli, Marion / Bashford-Rogers, Rachael / Sowerby, John M / Alouche, Nagham / Wong, Limy / Denton, Alice E / Linterman, Michelle A / Smith, Kenneth G C

    Nature communications

    2019  Volume 10, Issue 1, Page(s) 1970

    Abstract: Several tolerance checkpoints exist throughout B cell development to control autoreactive B cells and prevent the generation of pathogenic autoantibodies. FcγRIIb is an Fc receptor that inhibits B cell activation and, if defective, is associated with ... ...

    Abstract Several tolerance checkpoints exist throughout B cell development to control autoreactive B cells and prevent the generation of pathogenic autoantibodies. FcγRIIb is an Fc receptor that inhibits B cell activation and, if defective, is associated with autoimmune disease, yet its impact on specific B cell tolerance checkpoints is unknown. Here we show that reduced expression of FcγRIIb enhances the deletion and anergy of autoreactive immature B cells, but in contrast promotes autoreactive B cell expansion in the germinal center and serum autoantibody production, even in response to exogenous, non-self antigens. Our data thus show that FcγRIIb has opposing effects on pre-immune and post-immune tolerance checkpoints, and suggest that B cell tolerance requires the control of bystander germinal center B cells with low or no affinity for the immunizing antigen.
    MeSH term(s) Algorithms ; Animals ; B-Lymphocytes/immunology ; Cell Differentiation/physiology ; Cell Proliferation/physiology ; Enzyme-Linked Immunosorbent Assay ; Female ; Flow Cytometry ; Germinal Center ; Humans ; Immune Tolerance/immunology ; Leukocytes, Mononuclear/immunology ; Leukocytes, Mononuclear/metabolism ; Male ; Mice ; Receptors, IgG/genetics ; Receptors, IgG/metabolism ; Software
    Chemical Substances Receptors, IgG
    Language English
    Publishing date 2019-04-29
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-019-09434-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: CXCR4 Antagonist in HPV5-Associated Perianal Squamous-Cell Carcinoma.

    Marin-Esteban, Viviana / Molet, Lucie / Laganà, Marta / Ciocan, Dragos / Dominguez-Lafage, Clément / Alouche, Nagham / Nguyen, Julie / Gallego, Carmen / Mercier-Nomé, Françoise / Jaracz-Ros, Agnieszka / Beaupain, Blandine / Bouligand, Jérôme / Proust, Alexis / Habib, Christophe / Bonnin, Rémy A / Girlich, Delphine / Fouyssac, Fanny / Schmutz, Jean-Luc / Bursztejn, Anne-Claire /
    Bellanné-Chantelot, Christine / Bourrat, Emmanuelle / Herfs, Michael / Espéli, Marion / Balabanian, Karl / Schlecht-Louf, Géraldine / Donadieu, Jean / Bachelerie, Françoise / Deback, Claire

    The New England journal of medicine

    2024  Volume 390, Issue 14, Page(s) 1339–1341

    MeSH term(s) Humans ; Antineoplastic Agents/therapeutic use ; Antiviral Agents/therapeutic use ; Anus Neoplasms/drug therapy ; Anus Neoplasms/virology ; Betapapillomavirus ; Carcinoma, Squamous Cell/drug therapy ; Carcinoma, Squamous Cell/virology ; Receptors, CXCR4/antagonists & inhibitors ; Papillomavirus Infections/complications ; Papillomavirus Infections/drug therapy ; Papillomavirus Infections/virology ; Primary Immunodeficiency Diseases/drug therapy ; Primary Immunodeficiency Diseases/genetics ; Primary Immunodeficiency Diseases/virology ; Warts/drug therapy ; Warts/genetics ; Warts/virology ; Gain of Function Mutation
    Chemical Substances Antineoplastic Agents ; Antiviral Agents ; CXCR4 protein, human ; plerixafor (S915P5499N) ; Receptors, CXCR4
    Language English
    Publishing date 2024-04-20
    Publishing country United States
    Document type Letter
    ZDB-ID 207154-x
    ISSN 1533-4406 ; 0028-4793
    ISSN (online) 1533-4406
    ISSN 0028-4793
    DOI 10.1056/NEJMc2213180
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Fibroblast-derived IL-33 is dispensable for lymph node homeostasis but critical for CD8 T-cell responses to acute and chronic viral infection.

    Aparicio-Domingo, Patricia / Cannelle, Hélène / Buechler, Matthew B / Nguyen, Sylvain / Kallert, Sandra M / Favre, Stéphanie / Alouche, Nagham / Papazian, Natalie / Ludewig, Burkhard / Cupedo, Tom / Pinschewer, Daniel D / Turley, Shannon J / Luther, Sanjiv A

    European journal of immunology

    2020  Volume 51, Issue 1, Page(s) 76–90

    Abstract: Upon viral infection, stressed or damaged cells can release alarmins like IL-33 that act as endogenous danger signals alerting innate and adaptive immune cells. IL-33 coming from nonhematopoietic cells has been identified as important factor triggering ... ...

    Abstract Upon viral infection, stressed or damaged cells can release alarmins like IL-33 that act as endogenous danger signals alerting innate and adaptive immune cells. IL-33 coming from nonhematopoietic cells has been identified as important factor triggering the expansion of antiviral CD8
    MeSH term(s) Acute Disease ; Adaptive Immunity ; Animals ; CD8-Positive T-Lymphocytes/immunology ; Chronic Disease ; Endothelial Cells/immunology ; Fibroblasts/immunology ; Homeostasis ; Humans ; Immunity, Innate ; Interleukin-33/deficiency ; Interleukin-33/genetics ; Interleukin-33/metabolism ; Lymph Nodes/immunology ; Lymphocytic Choriomeningitis/immunology ; Lymphocytic choriomeningitis virus/immunology ; Male ; Mice ; Mice, Inbred C57BL ; Mice, Knockout ; Mice, Transgenic ; Models, Immunological
    Chemical Substances IL33 protein, human ; Il33 protein, mouse ; Interleukin-33
    Language English
    Publishing date 2020-08-05
    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.201948413
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Hematologic disorder-associated Cxcr4 gain-of-function mutation leads to uncontrolled extrafollicular immune response.

    Alouche, Nagham / Bonaud, Amélie / Rondeau, Vincent / Hussein-Agha, Rim / Nguyen, Julie / Bisio, Valeria / Khamyath, Mélanie / Crickx, Etienne / Setterblad, Niclas / Dulphy, Nicolas / Mahevas, Matthieu / McDermott, David H / Murphy, Philip M / Balabanian, Karl / Espéli, Marion

    Blood

    2021  Volume 137, Issue 22, Page(s) 3050–3063

    Abstract: The extrafollicular immune response is essential to generate a rapid but transient wave of protective antibodies during infection. Despite its importance, the molecular mechanisms controlling this first response are poorly understood. Here, we ... ...

    Abstract The extrafollicular immune response is essential to generate a rapid but transient wave of protective antibodies during infection. Despite its importance, the molecular mechanisms controlling this first response are poorly understood. Here, we demonstrate that enhanced Cxcr4 signaling caused by defective receptor desensitization leads to exacerbated extrafollicular B-cell response. Using a mouse model bearing a gain-of-function mutation of Cxcr4 described in 2 human hematologic disorders, warts, hypogammaglobulinemia, infections, and myelokathexis (WHIM) syndrome and Waldenström macroglobulinemia, we demonstrated that mutant B cells exhibited enhanced mechanistic target of rapamycin signaling, cycled more, and differentiated more potently into plasma cells than wild-type B cells after Toll-like receptor (TLR) stimulation. Moreover, Cxcr4 gain of function promoted enhanced homing and persistence of immature plasma cells in the bone marrow, a phenomenon recapitulated in WHIM syndrome patient samples. This translated in increased and more sustained production of antibodies after T-independent immunization in Cxcr4 mutant mice. Thus, our results establish that fine-tuning of Cxcr4 signaling is essential to limit the strength and length of the extrafollicular immune response.
    MeSH term(s) Animals ; Gain of Function Mutation ; Hematologic Diseases/genetics ; Hematologic Diseases/immunology ; Humans ; Mice ; Mice, Transgenic ; Plasma Cells/immunology ; Receptors, CXCR4/genetics ; Receptors, CXCR4/immunology ; Signal Transduction/genetics ; Signal Transduction/immunology ; TOR Serine-Threonine Kinases/genetics ; TOR Serine-Threonine Kinases/immunology
    Chemical Substances CXCR4 protein, mouse ; Receptors, CXCR4 ; mTOR protein, mouse (EC 2.7.1.1) ; TOR Serine-Threonine Kinases (EC 2.7.11.1)
    Language English
    Publishing date 2021-02-09
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 80069-7
    ISSN 1528-0020 ; 0006-4971
    ISSN (online) 1528-0020
    ISSN 0006-4971
    DOI 10.1182/blood.2020007450
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Efficient Plasma Cell Differentiation and Trafficking Require Cxcr4 Desensitization.

    Biajoux, Vincent / Natt, Jessica / Freitas, Christelle / Alouche, Nagham / Sacquin, Antoine / Hemon, Patrice / Gaudin, Françoise / Fazilleau, Nicolas / Espéli, Marion / Balabanian, Karl

    Cell reports

    2016  Volume 17, Issue 1, Page(s) 193–205

    Abstract: CXCR4 plays a central role in B cell immune response, notably by promoting plasma cell (PC) migration and maintenance in the bone marrow (BM). Gain-of-function mutations in CXCR4 affecting receptor desensitization have been reported in the rare ... ...

    Abstract CXCR4 plays a central role in B cell immune response, notably by promoting plasma cell (PC) migration and maintenance in the bone marrow (BM). Gain-of-function mutations in CXCR4 affecting receptor desensitization have been reported in the rare immunodeficiency called WHIM syndrome (WS). Despite lymphopenia, patients mount an immune response but fail to maintain it over time. Using a knockin mouse model phenocopying WS, we showed that, counter-intuitively, a gain of Cxcr4 function inhibited the maintenance of antibody titers after immunization. Although the Cxcr4 mutation intrinsically and locally promoted germinal center response and PC differentiation, antigen-specific PCs were barely detected in the BM, a defect mirrored by early accumulation of immature plasmablasts potentially occupying the survival niches for long-lived PCs. Therefore, fine-tuning of Cxcr4 desensitization is critically required for efficient PC differentiation and maintenance, and absence of such a regulatory process may account for the defective humoral immunity observed in WS patients.
    MeSH term(s) Animals ; Antibodies/blood ; B-Lymphocyte Subsets/drug effects ; B-Lymphocyte Subsets/immunology ; B-Lymphocyte Subsets/pathology ; Bone Marrow/drug effects ; Bone Marrow/immunology ; Bone Marrow/pathology ; Cell Differentiation ; Cell Movement ; Desensitization, Immunologic ; Disease Models, Animal ; Gene Expression ; Gene Knock-In Techniques ; Germinal Center ; Haptens ; Hemocyanins/administration & dosage ; Humans ; Immunity, Humoral ; Immunization ; Immunologic Deficiency Syndromes/genetics ; Immunologic Deficiency Syndromes/immunology ; Immunologic Deficiency Syndromes/pathology ; Mice ; Mice, Transgenic ; Ovalbumin/administration & dosage ; Plasma Cells/drug effects ; Plasma Cells/immunology ; Plasma Cells/pathology ; Receptors, CXCR4/genetics ; Receptors, CXCR4/immunology ; Signal Transduction ; Warts/genetics ; Warts/immunology ; Warts/pathology
    Chemical Substances 4-hydroxy-3-nitrophenylacetyl-keyhole limpet hemocyanin ; Antibodies ; CXCR4 protein, mouse ; Haptens ; Receptors, CXCR4 ; Ovalbumin (9006-59-1) ; Hemocyanins (9013-72-3)
    Language English
    Publishing date 2016-09-27
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2649101-1
    ISSN 2211-1247 ; 2211-1247
    ISSN (online) 2211-1247
    ISSN 2211-1247
    DOI 10.1016/j.celrep.2016.08.068
    Database MEDical Literature Analysis and Retrieval System OnLINE

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