Dye-Independent Methods Reveal Elevated Mitochondrial Mass in Hematopoietic Stem Cells.

Dye-Independent Methods Reveal Elevated Mitochondrial Mass in Hematopoietic Stem Cells.
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DOI:
10.1016/j.stem.2017.11.002
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发表时间:
2017-12-07
期刊:
影响因子:
23.9
通讯作者:
Snoeck HW
Snoeck HW
中科院分区:
医学1区
文献类型:
--
作者:
de Almeida MJ;Luchsinger LL;Corrigan DJ;Williams LJ;Snoeck HW

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Hematopoietic stem cells (HSCs) produce most cellular energy through glycolysis rather than through mitochondrial respiration. Consistent with this notion, mitochondrial mass has been reported to be low in HSCs. However, we found that staining with mitotracker green, a commonly used dye to measure mitochondrial content, leads to artifactually low fluorescence specifically in HSCs because of dye efflux. Using mtDNA quantification, enumeration of mitochondrial nucleoids and fluorescence intensity of a genetically encoded mitochondrial reporter we unequivocally show here that HSCs and multipotential progenitors (MPPs) have higher mitochondrial mass than lineage-committed progenitors and mature cells. Despite similar mitochondrial mass, respiratory capacity of MPPs exceeds that of HSCs. Furthermore, although elevated mitophagy has been invoked to explain low mitochondrial mass in HSCs, we observed that mitochondrial turnover capacity is comparatively low in HSCs. We propose that the role of mitochondria in HSC biology may have to be revisited in light of these findings.
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