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• W3129690954 abstract "Mitochondria of hematopoietic stem cells (HSCs) play crucial roles in regulating cell fate and preserving HSC functionality and survival. However, the mechanism underlying HSC regulation remains poorly understood. Here, we identify transcription factor TWIST1 as a novel regulator of HSC maintenance through modulation of mitochondrial function. We demonstrate that Twist1 deletion results in significantly decreased lymphoid-biased HSC frequency, markedly reduced HSC dormancy and self-renewal capacity, and skewed myeloid differentiation in steady-state hematopoiesis. Twist1-deficient HSCs are more compromised in tolerance of irradiation- and 5-fluorouracil-induced stresses and exhibit typical phenotypes of senescence. Mechanistically, Twist1 deletion induces transactivation of voltage-gated calcium channel (VGCC) Cacna1b, which exhausts lymphoid-biased HSCs, impairs genotoxic hematopoietic recovery, and enhances mitochondrial calcium levels, metabolic activity, and reactive oxygen species production. Suppression of VGCC by a calcium channel blocker largely rescues the phenotypic and functional defects in Twist1-deleted HSCs under both steady-state and stress conditions. Collectively, our data, for the first time, characterize TWIST1 as a critical regulator of HSC function acting through the CACNA1B/Ca2+/mitochondria axis and highlight the importance of Ca2+ in HSC maintenance. These observations provide new insights into the mechanisms for the control of HSC fate." @default.
• W3129690954 created "2021-03-01" @default.
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• W3129690954 date "2021-02-22" @default.
• W3129690954 modified "2023-10-18" @default.
• W3129690954 title "TWIST1 preserves hematopoietic stem cell function via CACNA1B/Ca2+/mitochondria axis" @default.
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• W3129690954 doi "https://doi.org/10.1182/blood.2020007489" @default.
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