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Autophagy. 2013 Nov 1;9(11):1737-49. doi: 10.4161/auto.26681. Epub 2013 Oct 11.

Mitophagy in hematopoietic stem cells: the case for exploration.

Author information

1
Department of Pathology; St. Jude Children's Research Hospital; Memphis, TN USA.

Abstract

Hematopoietic stem cells (HSCs) are inherently quiescent and self-renewing, yet can differentiate and commit to multiple blood cell types. Intracellular mitochondrial content is dynamic, and there is an increase in mitochondrial content during differentiation and lineage commitment in HSCs. HSCs reside in a hypoxic niche within the bone marrow and rely heavily on glycolysis, while differentiated and committed progenitors rely on oxidative phosphorylation. Increased oxidative phosphorylation during differentiation and commitment is not only due to increased mitochondrial content but also due to changes in mitochondrial cytosolic distribution and efficiency. These changes in the intracellular mitochondrial landscape contribute signals toward regulating differentiation and commitment. Thus, a functional relationship exists between the mitochondria in HSCs and the state of the HSCs (i.e., stemness vs. differentiated). This review focuses on how autophagy-mediated mitochondrial clearance (i.e., mitophagy) may affect HSC mitochondrial content, thereby influencing the fate of HSCs and maintenance of hematopoietic homeostasis.

KEYWORDS:

autophagy; commitment; differentiation; hematopoiesis; hematopoietic progenitor cells; hematopoietic stem cells; mitochondria; mitophagy; quiescence; self-renewal

PMID:
24135495
PMCID:
PMC4028333
DOI:
10.4161/auto.26681
[Indexed for MEDLINE]
Free PMC Article

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