An MTCH2 pathway repressing mitochondria metabolism regulates haematopoietic stem cell fate

Maria Maryanovich, Yehudit Zaltsman, Antonella Ruggiero, Andres Goldman, Liat Shachnai, Smadar Levin Zaidman, Ziv Porat, Karin Golan, Tsvee Lapidot and Atan Gross ()
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Maria Maryanovich: Weizmann Institute of Science
Yehudit Zaltsman: Weizmann Institute of Science
Antonella Ruggiero: Weizmann Institute of Science
Andres Goldman: Weizmann Institute of Science
Liat Shachnai: Weizmann Institute of Science
Smadar Levin Zaidman: Weizmann Institute of Science
Ziv Porat: Weizmann Institute of Science
Karin Golan: Weizmann Institute of Science
Tsvee Lapidot: Weizmann Institute of Science
Atan Gross: Weizmann Institute of Science

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract The metabolic state of stem cells is emerging as an important determinant of their fate. In the bone marrow, haematopoietic stem cell (HSC) entry into cycle, triggered by an increase in intracellular reactive oxygen species (ROS), corresponds to a critical metabolic switch from glycolysis to mitochondrial oxidative phosphorylation (OXPHOS). Here we show that loss of mitochondrial carrier homologue 2 (MTCH2) increases mitochondrial OXPHOS, triggering HSC and progenitor entry into cycle. Elevated OXPHOS is accompanied by an increase in mitochondrial size, increase in ATP and ROS levels, and protection from irradiation-induced apoptosis. In contrast, a phosphorylation-deficient mutant of BID, MTCH2’s ligand, induces a similar increase in OXPHOS, but with higher ROS and reduced ATP levels, and is associated with hypersensitivity to irradiation. Thus, our results demonstrate that MTCH2 is a negative regulator of mitochondrial OXPHOS downstream of BID, indispensible in maintaining HSC homeostasis.

Date: 2015
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DOI: 10.1038/ncomms8901

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