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  1. Article ; Online: Correction: Ikaros antagonizes DNA binding by STAT5 in pre-B cells.

    Heizmann, Beate / Le Gras, Stéphanie / Simand, Célestine / Marchal, Patricia / Chan, Susan / Kastner, Philippe

    PloS one

    2021  Volume 16, Issue 1, Page(s) e0246570

    Abstract: This corrects the article DOI: 10.1371/journal.pone.0242211.]. ...

    Abstract [This corrects the article DOI: 10.1371/journal.pone.0242211.].
    Language English
    Publishing date 2021-01-29
    Publishing country United States
    Document type Published Erratum
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0246570
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Kidins220 and Aiolos promote thymic iNKT cell development by reducing TCR signals.

    Herr, Laurenz A / Fiala, Gina J / Sagar / Schaffer, Anna-Maria / Hummel, Jonas F / Zintchenko, Marina / Raute, Katrin / Velasco Cárdenas, Rubí M-H / Heizmann, Beate / Ebert, Karolina / Fehrenbach, Kerstin / Janowska, Iga / Chan, Susan / Tanriver, Yakup / Minguet, Susana / Schamel, Wolfgang W

    Science advances

    2024  Volume 10, Issue 11, Page(s) eadj2802

    Abstract: Development of T cells is controlled by the signal strength of the TCR. The scaffold protein kinase D-interacting substrate of 220 kilodalton (Kidins220) binds to the TCR; however, its role in T cell development was unknown. Here, we show that T cell- ... ...

    Abstract Development of T cells is controlled by the signal strength of the TCR. The scaffold protein kinase D-interacting substrate of 220 kilodalton (Kidins220) binds to the TCR; however, its role in T cell development was unknown. Here, we show that T cell-specific Kidins220 knockout (T-KO) mice have strongly reduced invariant natural killer T (iNKT) cell numbers and modest decreases in conventional T cells. Enhanced apoptosis due to increased TCR signaling in T-KO iNKT thymocytes of developmental stages 2 and 3 shows that Kidins220 down-regulates TCR signaling at these stages. scRNA-seq  indicated that the transcription factor Aiolos is down-regulated in Kidins220-deficient iNKT cells. Analysis of an Aiolos KO demonstrated that Aiolos is a downstream effector of Kidins220 during iNKT cell development. In the periphery, T-KO iNKT cells show reduced TCR signaling upon stimulation with α-galactosylceramide, suggesting that Kidins220 promotes TCR signaling in peripheral iNKT cells. Thus, Kidins220 reduces or promotes signaling dependent on the iNKT cell developmental stage.
    MeSH term(s) Animals ; Mice ; Cell Differentiation ; Gene Expression Regulation ; Mice, Inbred C57BL ; Mice, Knockout ; Natural Killer T-Cells/metabolism ; Receptors, Antigen, T-Cell/metabolism ; Signal Transduction ; Membrane Proteins/metabolism ; Ikaros Transcription Factor/metabolism ; Thymus Gland/cytology ; Thymus Gland/metabolism
    Chemical Substances Receptors, Antigen, T-Cell ; Kidins220 protein, mouse ; Ikzf3 protein, mouse ; Membrane Proteins ; Ikaros Transcription Factor (148971-36-2)
    Language English
    Publishing date 2024-03-15
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2810933-8
    ISSN 2375-2548 ; 2375-2548
    ISSN (online) 2375-2548
    ISSN 2375-2548
    DOI 10.1126/sciadv.adj2802
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Ikaros antagonizes DNA binding by STAT5 in pre-B cells.

    Heizmann, Beate / Le Gras, Stéphanie / Simand, Célestine / Marchal, Patricia / Chan, Susan / Kastner, Philippe

    PloS one

    2020  Volume 15, Issue 11, Page(s) e0242211

    Abstract: The IKZF1 gene, which encodes the Ikaros transcription factor, is frequently deleted or mutated in patients with B-cell precursor acute lymphoblastic leukemias that express oncogenes, like BCR-ABL, which activate the JAK-STAT5 pathway. Ikaros ... ...

    Abstract The IKZF1 gene, which encodes the Ikaros transcription factor, is frequently deleted or mutated in patients with B-cell precursor acute lymphoblastic leukemias that express oncogenes, like BCR-ABL, which activate the JAK-STAT5 pathway. Ikaros functionally antagonizes the transcriptional programs downstream of IL-7/STAT5 during B cell development, as well as STAT5 activity in leukemic cells. However, the mechanisms by which Ikaros interferes with STAT5 function is unknown. We studied the genomic distribution of Ikaros and STAT5 on chromatin in a murine pre-B cell line, and found that both proteins colocalize on >60% of STAT5 target regions. Strikingly, Ikaros activity leads to widespread loss of STAT5 binding at most of its genomic targets within two hours of Ikaros induction, suggesting a direct mechanism. Ikaros did not alter the level of total or phosphorylated STAT5 proteins, nor did it associate with STAT5. Using sequences from the Cish, Socs2 and Bcl6 genes that Ikaros and STAT5 target, we show that both proteins bind overlapping sequences at GGAA motifs. Our results demonstrate that Ikaros antagonizes STAT5 DNA binding, in part by competing for common target sequences. Our study has implications for understanding the functions of Ikaros and STAT5 in B cell development and transformation.
    MeSH term(s) Animals ; Base Sequence ; Cell Line ; Chromatin/metabolism ; DNA/chemistry ; DNA/metabolism ; Ikaros Transcription Factor/deficiency ; Ikaros Transcription Factor/genetics ; Ikaros Transcription Factor/metabolism ; Interleukin-17/pharmacology ; Mice ; Mice, Knockout ; Phosphorylation ; Precursor Cells, B-Lymphoid/cytology ; Precursor Cells, B-Lymphoid/metabolism ; Protein Binding ; STAT5 Transcription Factor/genetics ; STAT5 Transcription Factor/metabolism ; Suppressor of Cytokine Signaling Proteins/chemistry ; Suppressor of Cytokine Signaling Proteins/metabolism ; Up-Regulation/drug effects
    Chemical Substances Chromatin ; Interleukin-17 ; STAT5 Transcription Factor ; Socs2 protein, mouse ; Suppressor of Cytokine Signaling Proteins ; Zfpn1a1 protein, mouse ; cytokine inducible SH2-containing protein ; Ikaros Transcription Factor (148971-36-2) ; DNA (9007-49-2)
    Language English
    Publishing date 2020-11-12
    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.0242211
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: The Ikaros family in lymphocyte development.

    Heizmann, Beate / Kastner, Philippe / Chan, Susan

    Current opinion in immunology

    2017  Volume 51, Page(s) 14–23

    Abstract: The IKZF family of transcription factors are essential regulators of lymphopoiesis. Ikaros, Helios, Aiolos and Eos function as transcriptional repressors and activators during T and B cell differentiation and in mature cell function, depending on the ... ...

    Abstract The IKZF family of transcription factors are essential regulators of lymphopoiesis. Ikaros, Helios, Aiolos and Eos function as transcriptional repressors and activators during T and B cell differentiation and in mature cell function, depending on the stage of development and/or cell type. Their potential mechanisms of action are varied. Ikaros family proteins partner with multiple complexes, including NuRD, PRC2 and transcription elongation factors, to modulate gene expression and the chromatin state. In humans, mutations in the IKZF genes are associated with B cell deficiency, leukemias and autoimmunity. In this review, we focus on the function of Ikaros family proteins in early T and B lymphocyte development, and discuss the molecular and physiological activities of this family.
    MeSH term(s) Animals ; Cell Differentiation/genetics ; Cell Lineage ; Gene Expression Regulation ; Humans ; Ikaros Transcription Factor/genetics ; Ikaros Transcription Factor/metabolism ; Lymphocyte Subsets/cytology ; Lymphocyte Subsets/immunology ; Lymphocyte Subsets/metabolism ; Lymphocytes/cytology ; Lymphocytes/immunology ; Lymphocytes/metabolism ; Lymphopoiesis/genetics ; Mice ; Multigene Family ; Signal Transduction
    Chemical Substances Ikaros Transcription Factor (148971-36-2)
    Language English
    Publishing date 2017-12-24
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1035767-1
    ISSN 1879-0372 ; 0952-7915
    ISSN (online) 1879-0372
    ISSN 0952-7915
    DOI 10.1016/j.coi.2017.11.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Ikaros deficiency is associated with aggressive BCR-ABL1 B-cell precursor acute lymphoblastic leukemia independent of the lineage and developmental origin.

    Simand, Célestine / Keime, Céline / Cayé, Aurélie / Arfeuille, Chloé / Passet, Marie / Kim, Rathana / Cavé, Hélène / Clappier, Emmanuelle / Kastner, Philippe / Chan, Susan / Heizmann, Beate

    Haematologica

    2022  Volume 107, Issue 1, Page(s) 316–320

    MeSH term(s) Fusion Proteins, bcr-abl/genetics ; Humans ; Ikaros Transcription Factor/genetics ; Ikaros Transcription Factor/metabolism ; Precursor B-Cell Lymphoblastic Leukemia-Lymphoma/genetics ; Precursor Cell Lymphoblastic Leukemia-Lymphoma
    Chemical Substances IKZF1 protein, human ; Ikaros Transcription Factor (148971-36-2) ; Fusion Proteins, bcr-abl (EC 2.7.10.2)
    Language English
    Publishing date 2022-01-01
    Publishing country Italy
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2333-4
    ISSN 1592-8721 ; 0017-6567 ; 0390-6078
    ISSN (online) 1592-8721
    ISSN 0017-6567 ; 0390-6078
    DOI 10.3324/haematol.2021.279125
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Ikaros limits follicular B cell activation by regulating B cell receptor signaling pathways

    Heizmann, Beate / MacLean Sellars / Alejandra Macias-Garcia / Susan Chan / Philippe Kastner

    Biochemical and biophysical research communications. 2016 Feb. 12, v. 470

    2016  

    Abstract: The Ikaros transcription factor is essential for early B cell development, but its effect on mature B cells is debated. We show that Ikaros is required to limit the response of naive splenic B cells to B cell receptor signals. Ikaros deficient follicular ...

    Abstract The Ikaros transcription factor is essential for early B cell development, but its effect on mature B cells is debated. We show that Ikaros is required to limit the response of naive splenic B cells to B cell receptor signals. Ikaros deficient follicular B cells grow larger and enter cell cycle faster after anti-IgM stimulation. Unstimulated mutant B cells show deregulation of positive and negative regulators of signal transduction at the mRNA level, and constitutive phosphorylation of ERK, p38, SYK, BTK, AKT and LYN. Stimulation results in enhanced and prolonged ERK and p38 phosphorylation, followed by hyper-proliferation. Pharmacological inhibition of ERK and p38 abrogates the increased proliferative response of Ikaros deficient cells. These results suggest that Ikaros functions as a negative regulator of follicular B cell activation.
    Keywords cell cycle ; gene expression ; messenger RNA ; mitogen-activated protein kinase ; mutants ; phosphorylation ; signal transduction ; transcription factors ; MAPK ; B cell signaling ; Transcription factor ; B cell receptor ; Transcriptional program ; Activation ; Ikaros
    Language English
    Dates of publication 2016-0212
    Size p. 714-720.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 205723-2
    ISSN 0006-291X ; 0006-291X
    ISSN (online) 0006-291X
    ISSN 0006-291X
    DOI 10.1016/j.bbrc.2016.01.060
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Ikaros is absolutely required for pre-B cell differentiation by attenuating IL-7 signals.

    Heizmann, Beate / Kastner, Philippe / Chan, Susan

    The Journal of experimental medicine

    2013  Volume 210, Issue 13, Page(s) 2823–2832

    Abstract: Pre-B cell receptor (pre-BCR) signaling and migration from IL-7-rich environments cooperate to drive pre-B cell differentiation via transcriptional programs that remain unclear. We show that the Ikaros transcription factor is required for the ... ...

    Abstract Pre-B cell receptor (pre-BCR) signaling and migration from IL-7-rich environments cooperate to drive pre-B cell differentiation via transcriptional programs that remain unclear. We show that the Ikaros transcription factor is required for the differentiation of large pre-B to small pre-B cells. Mice deleted for Ikaros in pro/pre-B cells show a complete block of differentiation at the fraction C' stage, and Ikaros-null pre-B cells cannot differentiate upon withdrawal of IL-7 in vitro. Restoration of Ikaros function rescues pre-B cell differentiation in vitro and in vivo and depends on DNA binding. Ikaros is required for the down-regulation of the pre-BCR, Igκ germline transcription, and Ig L chain recombination. Furthermore, Ikaros antagonizes the IL-7-dependent regulation of >3,000 genes, many of which are up- or down-regulated between fractions C' and D. Affected genes include those important for survival, metabolism, B cell signaling, and function, as well as transcriptional regulators like Ebf1, Pax5, and the Foxo1 family. Our data thus identify Ikaros as a central regulator of IL-7 signaling and pre-B cell development.
    MeSH term(s) Animals ; B-Lymphocytes/cytology ; Cell Differentiation ; Cell Separation ; Down-Regulation ; Flow Cytometry ; Ikaros Transcription Factor/metabolism ; Immunoglobulin kappa-Chains/genetics ; Immunoglobulin lambda-Chains/genetics ; Interleukin-7/metabolism ; Leukemia/genetics ; Leukemia/metabolism ; Mice ; Mice, Knockout ; Mutation ; Phenotype ; Recombination, Genetic ; Retroviridae/genetics ; Signal Transduction ; Transcription, Genetic ; Transcriptome ; VDJ Recombinases/metabolism
    Chemical Substances Immunoglobulin kappa-Chains ; Immunoglobulin lambda-Chains ; Interleukin-7 ; Zfpn1a1 protein, mouse ; Ikaros Transcription Factor (148971-36-2) ; VDJ Recombinases (EC 2.7.7.-)
    Language English
    Publishing date 2013-12-02
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 218343-2
    ISSN 1540-9538 ; 0022-1007
    ISSN (online) 1540-9538
    ISSN 0022-1007
    DOI 10.1084/jem.20131735
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  8. Article ; Online: Ikaros limits follicular B cell activation by regulating B cell receptor signaling pathways.

    Heizmann, Beate / Sellars, MacLean / Macias-Garcia, Alejandra / Chan, Susan / Kastner, Philippe

    Biochemical and biophysical research communications

    2016  Volume 470, Issue 3, Page(s) 714–720

    Abstract: The Ikaros transcription factor is essential for early B cell development, but its effect on mature B cells is debated. We show that Ikaros is required to limit the response of naive splenic B cells to B cell receptor signals. Ikaros deficient follicular ...

    Abstract The Ikaros transcription factor is essential for early B cell development, but its effect on mature B cells is debated. We show that Ikaros is required to limit the response of naive splenic B cells to B cell receptor signals. Ikaros deficient follicular B cells grow larger and enter cell cycle faster after anti-IgM stimulation. Unstimulated mutant B cells show deregulation of positive and negative regulators of signal transduction at the mRNA level, and constitutive phosphorylation of ERK, p38, SYK, BTK, AKT and LYN. Stimulation results in enhanced and prolonged ERK and p38 phosphorylation, followed by hyper-proliferation. Pharmacological inhibition of ERK and p38 abrogates the increased proliferative response of Ikaros deficient cells. These results suggest that Ikaros functions as a negative regulator of follicular B cell activation.
    MeSH term(s) Animals ; B-Lymphocytes ; Cell Proliferation/physiology ; Cells, Cultured ; Gene Expression Regulation/physiology ; Ikaros Transcription Factor/metabolism ; Mice ; Mice, Inbred C57BL ; Receptors, Antigen, B-Cell/metabolism ; Signal Transduction/physiology ; Spleen/cytology
    Chemical Substances Receptors, Antigen, B-Cell ; Zfpn1a1 protein, mouse ; Ikaros Transcription Factor (148971-36-2)
    Language English
    Publishing date 2016-02-12
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 205723-2
    ISSN 1090-2104 ; 0006-291X ; 0006-291X
    ISSN (online) 1090-2104 ; 0006-291X
    ISSN 0006-291X
    DOI 10.1016/j.bbrc.2016.01.060
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Syk is a dual-specificity kinase that self-regulates the signal output from the B-cell antigen receptor

    Heizmann, Beate / Reth, Michael / Infantino, Simona

    Proceedings of the National Academy of Sciences of the United States of America. 2010 Oct. 26, v. 107, no. 43

    2010  

    Abstract: Upon B-cell activation, the signaling subunits Ig-α and Ig-β of the B-cell antigen receptor become phosphorylated not only on tyrosines but also on serine residues. Using a specific antibody, we show that serine 197 (S197) in the cytoplasmic tail of Ig-α ...

    Abstract Upon B-cell activation, the signaling subunits Ig-α and Ig-β of the B-cell antigen receptor become phosphorylated not only on tyrosines but also on serine residues. Using a specific antibody, we show that serine 197 (S197) in the cytoplasmic tail of Ig-α is phosphorylated upon B-cell antigen receptor activation, and that this modification inhibits the signal output of the B-cell antigen receptor. Surprisingly, we found that the well-known protein tyrosine kinase Syk (spleen tyrosine kinase) phosphorylates S197 on Ig-α, thus not only activating but also inhibiting signaling from the B-cell antigen receptor. This finding identifies Syk as a dual-specificity kinase and establishes a previously unexplored paradigm for the self-regulation of biological signaling processes.
    Keywords B-lymphocytes ; antibodies ; antigens ; dual-specificity kinase ; non-specific protein-tyrosine kinase ; serine
    Language English
    Dates of publication 2010-1026
    Size p. 18563-18568.
    Publishing place National Academy of Sciences
    Document type Article
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.1009048107
    Database NAL-Catalogue (AGRICOLA)

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  10. Article ; Online: Syk is a dual-specificity kinase that self-regulates the signal output from the B-cell antigen receptor.

    Heizmann, Beate / Reth, Michael / Infantino, Simona

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

    2010  Volume 107, Issue 43, Page(s) 18563–18568

    Abstract: Upon B-cell activation, the signaling subunits Ig-α and Ig-β of the B-cell antigen receptor become phosphorylated not only on tyrosines but also on serine residues. Using a specific antibody, we show that serine 197 (S197) in the cytoplasmic tail of Ig-α ...

    Abstract Upon B-cell activation, the signaling subunits Ig-α and Ig-β of the B-cell antigen receptor become phosphorylated not only on tyrosines but also on serine residues. Using a specific antibody, we show that serine 197 (S197) in the cytoplasmic tail of Ig-α is phosphorylated upon B-cell antigen receptor activation, and that this modification inhibits the signal output of the B-cell antigen receptor. Surprisingly, we found that the well-known protein tyrosine kinase Syk (spleen tyrosine kinase) phosphorylates S197 on Ig-α, thus not only activating but also inhibiting signaling from the B-cell antigen receptor. This finding identifies Syk as a dual-specificity kinase and establishes a previously unexplored paradigm for the self-regulation of biological signaling processes.
    MeSH term(s) Amino Acid Sequence ; Animals ; B-Lymphocytes/immunology ; B-Lymphocytes/metabolism ; CD79 Antigens/chemistry ; CD79 Antigens/genetics ; CD79 Antigens/metabolism ; Cell Line ; Drosophila ; Intracellular Signaling Peptides and Proteins/chemistry ; Intracellular Signaling Peptides and Proteins/genetics ; Intracellular Signaling Peptides and Proteins/metabolism ; Mice ; Mice, Inbred BALB C ; Mice, Knockout ; Mice, Transgenic ; Models, Molecular ; Molecular Sequence Data ; Mutation ; Phosphorylation ; Protein-Tyrosine Kinases/chemistry ; Protein-Tyrosine Kinases/genetics ; Protein-Tyrosine Kinases/metabolism ; Receptors, Antigen, B-Cell/chemistry ; Receptors, Antigen, B-Cell/genetics ; Receptors, Antigen, B-Cell/metabolism ; Recombinant Proteins/chemistry ; Recombinant Proteins/genetics ; Recombinant Proteins/metabolism ; Serine/chemistry ; Signal Transduction ; Structural Homology, Protein ; Syk Kinase
    Chemical Substances CD79 Antigens ; Cd79a protein, mouse ; Intracellular Signaling Peptides and Proteins ; Receptors, Antigen, B-Cell ; Recombinant Proteins ; Serine (452VLY9402) ; Protein-Tyrosine Kinases (EC 2.7.10.1) ; Syk Kinase (EC 2.7.10.2) ; Syk protein, mouse (EC 2.7.10.2)
    Language English
    Publishing date 2010-10-12
    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.1009048107
    Database MEDical Literature Analysis and Retrieval System OnLINE

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