Journal
CELL REPORTS
Volume 34, Issue 5, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.celrep.2021.108723
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Funding
- Clarin-COFUND EU Program (Principado de Asturias, Spain)
- GR-Ex
- Cancer Research UK [C596/A17196, A23982]
- NIH [DK32094, HL144436, HL152099]
- FRM research grant (NutriDiff)
- ARC research grant (NutriDiff)
- French national (ANR) research grant (NutriDiff)
- French laboratory consortium (Labex) EpiGenMed
- French laboratory consortium (Labex) GR-Ex
- NCI Intramural Program
- Ligue fellowship
- ARC fellowship
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Research has shown that as hematopoietic stem and progenitor cells develop into erythroid-committed proerythroblasts, there is an increase in alpha-ketoglutarate production, driving oxidative phosphorylation. Late-stage erythropoiesis, however, relies on decreased alpha-ketoglutarate-driven oxidative phosphorylation, with IDH1 playing a central role. Ineffective erythropoiesis is regulated by vitamin C homeostasis, with oxidized ascorbate exacerbating abnormal erythroblast phenotypes in IDH1-downregulated progenitors.
The metabolic changes controlling the stepwise differentiation of hematopoietic stem and progenitor cells (HSPCs) to mature erythrocytes are poorly understood. Here, we show that HSPC development to an erythroid-committed proerythroblast results in augmented glutaminolysis, generating alpha-ketoglutarate (alpha KG) and driving mitochondrial oxidative phosphorylation (OXPHOS). However, sequential late-stage erythropoiesis is dependent on decreasing alpha KG-driven OXPHOS, and we find that isocitrate dehydrogenase 1 (IDH1) plays a central role in this process. IDH1 downregulation augments mitochondrial oxidation of alpha KG and inhibits reticulocyte generation. Furthermore, IDH1 knockdown results in the generation of multinucleated erythroblasts, a morphological abnormality characteristic of myelodysplastic syndrome and congenital dyserythropoietic anemia. We identify vitamin C homeostasis as a critical regulator of ineffective erythropoiesis; oxidized ascorbate increases mitochondrial superoxide and significantly exacerbates the abnormal erythroblast phenotype of IDH1-downregulated progenitors, whereas vitamin C, scavenging reactive oxygen species (ROS) and reprogramming mitochondrial metabolism, rescues erythropoiesis. Thus, an IDH1-vitamin C crosstalk controls terminal steps of human erythroid differentiation.
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