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Mitochondrial complex III is necessary for endothelial cell proliferation during angiogenesis.

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2019

Nat Metab. 2019 Jan;1(1):158-171. doi: 10.1038/s42255-018-0011-x. Epub 2019 Jan 7.

Mitochondrial complex III is necessary for endothelial cell proliferation during angiogenesis.

LP Diebold;HJ Gil;P Gao;CA Martinez;SE Weinberg;NS Chandel

Departments of Medicine and Robert H. Lurie Cancer Center, Northwestern University Feinberg School of Medicine, Chicago, IL 60611. Center for Vascular and Developmental Biology, Feinberg Cardiovascular Research Institute, Northwestern University, Chicago, IL 60611. Robert H. Lurie Cancer Center Metabolomics Core, Northwestern University Feinberg School of Medicine, Chicago, IL 60611. Department of Biochemistry and Molecular Genetics, Northwestern University Feinberg School of Medicine, Chicago, IL 60611.

Service type: Knockout mice

Abstract

Endothelial cells (ECs) require glycolysis for proliferation and migration during angiogenesis; however, the necessity for the mitochondrial respiratory chain during angiogenesis is not known. Here we report that inhibition of respiratory chain complex III impairs proliferation, but not migration of ECs in vitro by decreasing the NAD+/NADH ratio. To determine whether mitochondrial respiration is necessary for angiogenesis in vivo, we conditionally ablate a subunit of the respiratory chain complex III (QPC) in ECs. Loss of QPC decreases respiration, resulting in diminished EC proliferation, and impairment in retinal and tumor angiogenesis. Loss of QPC does not decrease genes associated with anabolism or nucleotides levels in ECs, but diminishes amino acid levels. Our findings indicate that mitochondrial respiration is necessary for angiogenesis, and that the primary role of mitochondria in ECs is to serve as biosynthetic organelles for cell proliferation.

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