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Autophagy-Sirt3 axis decelerates hematopoietic aging.

Yixuan Fang1,2,3, Ni An1,2, Lingjiang Zhu1,2

  • 1Hematology Center of Cyrus Tang Medical Institute, Jiangsu Institute of Hematology, Institute of Blood and Marrow Transplantation, Collaborative Innovation Center of Hematology, National Clinical Research Center for Hematologic Diseases, The First Affiliated Hospital, Soochow University School of Medicine, Suzhou, China.

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Autophagy decline accelerates blood aging in humans. Activating autophagy boosts Sirt3, a protein that rejuvenates blood stem cells, offering a potential intervention for age-related hematopoiesis decline.

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Area of Science:

  • Hematology
  • Cellular Biology
  • Aging Research

Background:

  • Autophagy is known to preserve hematopoietic stem cells (HSCs) in mice by suppressing mitochondrial metabolism.
  • The role of autophagy in human hematopoietic aging remains largely uncharacterized.
  • Reduced autophagy is increasingly linked to age-related cellular dysfunction.

Purpose of the Study:

  • To investigate the mechanism by which autophagy regulates hematopoietic aging in humans.
  • To explore the relationship between autophagy, Sirt3 expression, and blood rejuvenation.
  • To identify potential therapeutic targets for combating age-related decline in blood cell production.

Main Methods:

  • Analysis of autophagy levels in human hematopoietic cells and HSCs across different age groups.
  • Investigating the regulatory link between autophagy and Sirt3 expression in mouse and human hematopoietic cells.
  • Utilizing genetic manipulation (forced Sirt3 expression) in mouse models to assess its impact on hematopoietic aging.
  • Validating the effect of autophagy modulation on Sirt3 expression in human HSC-enriched cells.

Main Results:

  • A reduction in autophagy in human hematopoietic cells and HSCs correlates with aged hematopoiesis.
  • Autophagy activation upregulates Sirt3, a mitochondrial protein crucial for blood rejuvenation.
  • In mice, autophagy deficiency impairs Sirt3 expression, leading to accelerated hematopoietic aging.
  • Forced Sirt3 expression in HSCs mitigates oxidative stress and prevents aging-related hematopoietic decline caused by autophagy defects.
  • Autophagy-induced Sirt3 upregulation is confirmed in human HSC-enriched cells.

Conclusions:

  • An autophagy-Sirt3 axis is identified as a key regulator of hematopoietic aging.
  • This axis plays a critical role in maintaining blood cell function and rejuvenation.
  • Targeting the autophagy-Sirt3 pathway presents a promising strategy for human blood rejuvenation interventions.