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Tubío-Santamaría N, Jayavelu AK, Schnoeder TM, Eifert T, Hsu CJ, Perner F, Zhang Q, Wenge DV, Hansen FM, Kirkpatrick JM, Jyotsana N, Lane SW, von Eyss B, Deshpande AJ, Kühn MWM, Schwaller J, Cammann C, Seifert U, Ebstein F, Krüger E, Hochhaus A, Heuser M, Ori A, Mann M, Armstrong SA, Heidel FH. Immunoproteasome function maintains oncogenic gene expression in KMT2A-complex driven leukemia. Mol Cancer 2023; 22:196. [PMID: 38049829 PMCID: PMC10694946 DOI: 10.1186/s12943-023-01907-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Accepted: 11/21/2023] [Indexed: 12/06/2023] Open
Abstract
Pharmacologic targeting of chromatin-associated protein complexes has shown significant responses in KMT2A-rearranged (KMT2A-r) acute myeloid leukemia (AML) but resistance frequently develops to single agents. This points to a need for therapeutic combinations that target multiple mechanisms. To enhance our understanding of functional dependencies in KMT2A-r AML, we have used a proteomic approach to identify the catalytic immunoproteasome subunit PSMB8 as a specific vulnerability. Genetic and pharmacologic inactivation of PSMB8 results in impaired proliferation of murine and human leukemic cells while normal hematopoietic cells remain unaffected. Disruption of immunoproteasome function drives an increase in transcription factor BASP1 which in turn represses KMT2A-fusion protein target genes. Pharmacologic targeting of PSMB8 improves efficacy of Menin-inhibitors, synergistically reduces leukemia in human xenografts and shows preserved activity against Menin-inhibitor resistance mutations. This identifies and validates a cell-intrinsic mechanism whereby selective disruption of proteostasis results in altered transcription factor abundance and repression of oncogene-specific transcriptional networks. These data demonstrate that the immunoproteasome is a relevant therapeutic target in AML and that targeting the immunoproteasome in combination with Menin-inhibition could be a novel approach for treatment of KMT2A-r AML.
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Affiliation(s)
- Nuria Tubío-Santamaría
- Innere Medizin C, Universitätsmedizin Greifswald, 17475, Greifswald, Germany
- Leibniz Institute On Aging, Fritz-Lipmann Institute, 07745, Jena, Germany
| | - Ashok Kumar Jayavelu
- Max-Planck-Institute of Biochemistry, Munich, Germany
- Proteomics and Cancer Cell Signaling Group, DKFZ, Heidelberg, Germany
| | - Tina M Schnoeder
- Innere Medizin C, Universitätsmedizin Greifswald, 17475, Greifswald, Germany
- Leibniz Institute On Aging, Fritz-Lipmann Institute, 07745, Jena, Germany
| | - Theresa Eifert
- Innere Medizin C, Universitätsmedizin Greifswald, 17475, Greifswald, Germany
- Leibniz Institute On Aging, Fritz-Lipmann Institute, 07745, Jena, Germany
| | - Chen-Jen Hsu
- Innere Medizin C, Universitätsmedizin Greifswald, 17475, Greifswald, Germany
- Leibniz Institute On Aging, Fritz-Lipmann Institute, 07745, Jena, Germany
| | - Florian Perner
- Innere Medizin C, Universitätsmedizin Greifswald, 17475, Greifswald, Germany
| | - Qirui Zhang
- Innere Medizin C, Universitätsmedizin Greifswald, 17475, Greifswald, Germany
| | - Daniela V Wenge
- Department of Pediatric Oncology, Dana Farber Cancer Institute, Harvard University, Boston, MA, 02215, USA
| | - Fynn M Hansen
- Max-Planck-Institute of Biochemistry, Munich, Germany
| | | | - Nidhi Jyotsana
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN, USA
| | - Steven W Lane
- Queensland Institute for Medical Research (QIMR), Brisbane, Australia
| | - Björn von Eyss
- Leibniz Institute On Aging, Fritz-Lipmann Institute, 07745, Jena, Germany
| | | | - Michael W M Kühn
- Medizinische Klinik 3, Hämatologie, Onkologie und Pneumologie, Universitätsmedizin Mainz, Mainz, Germany
| | - Juerg Schwaller
- Department of Biomedicine, University Children's Hospital of Basel, Basel, Switzerland
| | - Clemens Cammann
- Friedrich Loeffler-Institut für Medizinische Mikrobiologie - Virologie, Universitätsmedizin Greifswald, 17475, Greifswald, Germany
| | - Ulrike Seifert
- Friedrich Loeffler-Institut für Medizinische Mikrobiologie - Virologie, Universitätsmedizin Greifswald, 17475, Greifswald, Germany
| | - Frédéric Ebstein
- Department of Biochemistry, Universitätsmedizin Greifswald, 17475, Greifswald, Germany
| | - Elke Krüger
- Department of Biochemistry, Universitätsmedizin Greifswald, 17475, Greifswald, Germany
| | | | - Michael Heuser
- Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School (MHH), Hannover, Germany
| | - Alessandro Ori
- Leibniz Institute On Aging, Fritz-Lipmann Institute, 07745, Jena, Germany
| | - Matthias Mann
- Max-Planck-Institute of Biochemistry, Munich, Germany
| | - Scott A Armstrong
- Department of Pediatric Oncology, Dana Farber Cancer Institute, Harvard University, Boston, MA, 02215, USA
| | - Florian H Heidel
- Innere Medizin C, Universitätsmedizin Greifswald, 17475, Greifswald, Germany.
- Leibniz Institute On Aging, Fritz-Lipmann Institute, 07745, Jena, Germany.
- Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School (MHH), Hannover, Germany.
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Anuj A, Reuven N, Roberts SGE, Elson A. BASP1 down-regulates RANKL-induced osteoclastogenesis. Exp Cell Res 2023; 431:113758. [PMID: 37619639 DOI: 10.1016/j.yexcr.2023.113758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 07/03/2023] [Accepted: 08/21/2023] [Indexed: 08/26/2023]
Abstract
The cytokine RANKL (Receptor Activator of NFκB Ligand) is the key driver of differentiation of monocytes/macrophages to form multi-nucleated, bone-resorbing osteoclasts, a process that is accompanied by significant changes in gene expression. We show that exposure to RANKL rapidly down-regulates expression of Brain Acid Soluble Protein 1 (BASP1) in cultured primary mouse bone marrow macrophages (BMMs), and that this reduced expression is causally linked to the osteoclastogenic process in vitro. Knocking down BASP1 expression in BMMs or eliminating its expression in these cells or in RAW 264.7 cells enhanced RANKL-induced osteoclastogenesis, promoted cell-cell fusion, and generated cultures containing larger osteoclasts with increased mineral degrading abilities relative to controls. Expression of exogenous BASP1 in BMMs undergoing osteoclastogenic differentiation produced the opposite effects. Upon exposure to RANKL, primary mouse BMMs in which BASP1 had been knocked down exhibited increased expression of the key osteoclastogenic transcription factor Nfatc1and of its downstream target genes Dc-stamp, Ctsk, Itgb3, and Mmp9 relative to controls. The knock-down cells also exhibited increased sensitivity to the pro-osteoclastogenic effects of RANKL. We conclude that BASP1 is a negative regulator of RANKL-induced osteoclastogenesis, which down-regulates the pro-osteoclastogenic gene expression pattern induced by this cytokine. Decreased expression of BASP1 upon exposure of BMMs to RANKL removes a negative regulator of osteoclastogenesis and promotes this process.
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Affiliation(s)
- Anuj Anuj
- Department of Molecular Genetics, The Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Nina Reuven
- Department of Molecular Genetics, The Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Stefan G E Roberts
- School of Cellular & Molecular Medicine, University of Bristol, Bristol, BS8 1TD, United Kingdom
| | - Ari Elson
- Department of Molecular Genetics, The Weizmann Institute of Science, Rehovot, 76100, Israel.
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Wang Q, Xu T, Fang F, Wang Q, Lundquist P, Sun L. Capillary Zone Electrophoresis-Tandem Mass Spectrometry for Top-Down Proteomics of Mouse Brain Integral Membrane Proteins. Anal Chem 2023; 95:12590-12594. [PMID: 37595263 PMCID: PMC10540247 DOI: 10.1021/acs.analchem.3c02346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/20/2023]
Abstract
Mass spectrometry (MS)-based top-down characterization of integral membrane proteins (IMPs) is crucial for understanding their functions in biological processes. However, it is technically challenging due to their low solubility in typical MS-compatible buffers. In this work, for the first time, we developed an efficient capillary zone electrophoresis (CZE)-tandem MS (MS/MS) method for the top-down proteomics (TDP) of IMPs enriched from mouse brains. Our technique employs a sample buffer containing 30% (v/v) formic acid and 60% (v/v) methanol for solubilizing IMPs and utilizes a separation buffer of 30% (v/v) acetic acid and 30% (v/v) methanol for maintaining the solubility of IMPs during CZE separation. Single-shot CZE-MS/MS identified 51 IMP proteoforms from the mouse brain sample. Coupling size exclusion chromatography (SEC) to CZE-MS/MS enabled the identification of 276 IMP proteoforms from the mouse brain sample containing 1-4 transmembrane domains. This proof-of-concept work demonstrates the high potential of CZE-MS/MS for the large-scale TDP of IMPs.
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Affiliation(s)
- Qianjie Wang
- Department of Chemistry, Michigan State University, 578 S Shaw Lane, East Lansing, Michigan 48824, United States
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824, United States
- Plant Resilience Institute, Michigan State University, East Lansing, Michigan 48824, United States
| | - Tian Xu
- Department of Chemistry, Michigan State University, 578 S Shaw Lane, East Lansing, Michigan 48824, United States
| | - Fei Fang
- Department of Chemistry, Michigan State University, 578 S Shaw Lane, East Lansing, Michigan 48824, United States
| | - Qianyi Wang
- Department of Chemistry, Michigan State University, 578 S Shaw Lane, East Lansing, Michigan 48824, United States
| | - Peter Lundquist
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824, United States
- Plant Resilience Institute, Michigan State University, East Lansing, Michigan 48824, United States
| | - Liangliang Sun
- Department of Chemistry, Michigan State University, 578 S Shaw Lane, East Lansing, Michigan 48824, United States
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