Autophagy‐Sirt3 axis decelerates hematopoietic aging. Issue 10 (20th September 2020)

• Record Type: Journal Article
• Authors: Fang, Yixuan; An, Ni; Zhu, Lingjiang; Gu, Yue; Qian, Jiawei; Jiang, Gaoyue; Zhao, Ruijin; Wei, Wen; Xu, Li; Zhang, Gaochuan; Yao, Xingyun; Yuan, Na; Zhang, Suping; Zhao, Yun; Wang, Jianrong
• Is Part Of: Aging cell. Volume 19:Issue 10(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-09-20
• Subjects: Cells -- Aging -- Periodicals; 571.8783605
• DOI: 10.1111/acel.13232
• Languages: English
• ISSNs: 1474-9718

Abstract

ABSTRACT: Autophagy suppresses mitochondrial metabolism to preserve hematopoietic stem cells (HSCs) in mice. However, the mechanism by which autophagy regulates hematopoietic aging, in particular in humans, has largely been unexplored. Here, we demonstrate that reduction of autophagy in both hematopoietic cells and their stem cells is associated with aged hematopoiesis in human population. Mechanistically, autophagy delays hematopoietic aging by activating the downstream expression of Sirt3, a key mitochondrial protein capable of rejuvenating blood. Sirt3 is the most abundant Sirtuin family member in HSC‐enriched population, though it declines as the capacity for autophagy deteriorates with aging. Activation of autophagy upregulates Sirt3 in wild‐type mice, whereas in autophagy‐defective mice, Sirt3 expression is crippled in the entire hematopoietic hierarchy, but forced expression of Sirt3 in HSC‐enriched cells reduces oxidative stress and prevents accelerated hematopoietic aging from autophagy defect. Importantly, the upregulation of Sirt3 by manipulation of autophagy is validated in human HSC‐enriched cells. Thus, our results identify an autophagy‐Sirt3 axis in regulating hematopoietic aging and suggest a possible interventional solution to human blood rejuvenation via activation of the axis. Abstract : Autophagy collaborates with Sirt3, to form a regulatory axis that synergistically delays hematopoietic aging in both mice and humans. Positive intervention to the autophagy‐Sirt3 axis leads to blood rejuvenation.