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Chagraoui J, Girard S, Mallinger L, Mayotte N, Tellechea MF, Sauvageau G. KBTBD4-mediated reduction of MYC is critical for hematopoietic stem cell expansion upon UM171 treatment. Blood 2024; 143:882-894. [PMID: 38207291 DOI: 10.1182/blood.2023021342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 12/27/2023] [Accepted: 12/29/2023] [Indexed: 01/13/2024] Open
Abstract
ABSTRACT Ex vivo expansion of hematopoietic stem cells (HSCs) is gaining importance for cell and gene therapy, and requires a shift from dormancy state to activation and cycling. However, abnormal or excessive HSC activation results in reduced self-renewal ability and increased propensity for myeloid-biased differentiation. We now report that activation of the E3 ligase complex CRL3KBTBD4 by UM171 not only induces epigenetic changes through CoREST1 degradation but also controls chromatin-bound master regulator of cell cycle entry and proliferative metabolism (MYC) levels to prevent excessive activation and maintain lympho-myeloid potential of expanded populations. Furthermore, reconstitution activity and multipotency of UM171-treated HSCs are specifically compromised when MYC levels are experimentally increased despite degradation of CoREST1.
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Affiliation(s)
- Jalila Chagraoui
- Molecular Genetics of Stem Cells Laboratory, Institute for Research in Immunology and Cancer, University of Montreal, Montreal, QC, Canada
| | - Simon Girard
- Molecular Genetics of Stem Cells Laboratory, Institute for Research in Immunology and Cancer, University of Montreal, Montreal, QC, Canada
| | - Laure Mallinger
- Molecular Genetics of Stem Cells Laboratory, Institute for Research in Immunology and Cancer, University of Montreal, Montreal, QC, Canada
| | - Nadine Mayotte
- Molecular Genetics of Stem Cells Laboratory, Institute for Research in Immunology and Cancer, University of Montreal, Montreal, QC, Canada
| | - Maria Florencia Tellechea
- Molecular Genetics of Stem Cells Laboratory, Institute for Research in Immunology and Cancer, University of Montreal, Montreal, QC, Canada
| | - Guy Sauvageau
- Molecular Genetics of Stem Cells Laboratory, Institute for Research in Immunology and Cancer, University of Montreal, Montreal, QC, Canada
- Division of Hematology, Maisonneuve-Rosemont Hospital, Montreal, QC, Canada
- Department of Medicine, Faculty of Medicine, University of Montreal, Montreal, QC, Canada
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Meaker GA, Wilkinson AC. Ex vivo hematopoietic stem cell expansion technologies: recent progress, applications, and open questions. Exp Hematol 2024; 130:104136. [PMID: 38072133 DOI: 10.1016/j.exphem.2023.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 11/23/2023] [Accepted: 12/05/2023] [Indexed: 12/27/2023]
Abstract
Hematopoietic stem cells (HSCs) are a rare but potent cell type that support life-long hematopoiesis and stably regenerate the entire blood and immune system following transplantation. HSC transplantation represents a mainstay treatment for various diseases of the blood and immune systems. The ex vivo expansion and manipulation of HSCs therefore represents an important approach to ask biological questions in experimental hematology and to help improve clinical HSC transplantation therapies. However, it has remained challenging to expand transplantable HSCs ex vivo. This review summarizes recent progress in ex vivo HSC expansion technologies and their applications to biological and clinical problems and discusses current questions in the field.
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Affiliation(s)
- Grace A Meaker
- MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Adam C Wilkinson
- MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK.
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