2. Academic Validation
  3. ATP citrate lyase controls hematopoietic stem cell fate and supports bone marrow regeneration

ATP citrate lyase controls hematopoietic stem cell fate and supports bone marrow regeneration

  • EMBO J. 2022 Apr 19;41(8):e109463. doi: 10.15252/embj.2021109463.
Terumasa Umemoto 1,  Alban Johansson 1,  Shah Adil Ishtiyaq Ahmad 1,  Michihiro Hashimoto 2,  Sho Kubota 3,  Kenta Kikuchi 4,  Haruki Odaka 5,  Takumi Era 5,  Daisuke Kurotaki 4,  Goro Sashida 3,  Toshio Suda 2 6
Affiliations

Affiliations

  • 1 Laboratory of Hematopoietic Stem Cell Engineering, International Research Center for Medical Sciences, Kumamoto University, Kumamoto, Japan.
  • 2 Laboratory of Stem Cell Regulation, International Research Center for Medical Sciences, Kumamoto University, Kumamoto, Japan.
  • 3 Laboratory of Transcriptional Regulation in Leukemogenesis, International Research Center for Medical Sciences, Kumamoto University, Kumamoto, Japan.
  • 4 Laboratory of Chromatin Organization in Immune Cell Development, International Research Center for Medical Sciences, Kumamoto University, Kumamoto, Japan.
  • 5 Department of Cell Modulation, Institute of Molecular Embryology and Genetics, Kumamoto University, Kumamoto, Japan.
  • 6 Cancer Science Institute of Singapore, National University of Singapore, Singapore City, Singapore.
PMID: 35229328 DOI: 10.15252/embj.2021109463
Abstract

In order to support bone marrow regeneration after myeloablation, hematopoietic stem cells (HSCs) actively divide to provide both stem and progenitor cells. However, the mechanisms regulating HSC function and cell fate choice during hematopoietic recovery remain unclear. We herein provide novel insights into HSC regulation during regeneration by focusing on Mitochondrial Metabolism and ATP Citrate Lyase (ACLY). After 5-fluorouracil-induced myeloablation, HSCs highly expressing endothelial protein C receptor (EPCRhigh ) were enriched within the stem cell fraction at the expense of more proliferative EPCRLow HSCs. These EPCRHigh HSCs were initially more primitive than EPCRLow HSCs and enabled stem cell expansion by enhancing histone acetylation, due to increased activity of ACLY in the early phase of hematopoietic regeneration. In the late phase of recovery, HSCs enhanced differentiation potential by increasing the accessibility of cis-regulatory elements in progenitor cell-related genes, such as CD48. In conditions of reduced Mitochondrial Metabolism and ACLY activity, these HSCs maintained stem cell phenotypes, while ACLY-dependent histone acetylation promoted differentiation into CD48+ progenitor cells. Collectively, these results indicate that the dynamic control of ACLY-dependent metabolism and epigenetic alterations is essential for HSC regulation during hematopoietic regeneration.

Keywords

Acly; bone marrow regeneration; hematopoietic stem cells; mitochondrial metabolism.

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