Abstract:
:In the normal quiescent vasculature, only 0.01% of endothelial cells (ECs) are proliferating. However, this proportion increases dramatically following the angiogenic switch during tumor growth or wound healing. Recent evidence suggests that this angiogenic switch is accompanied by a metabolic switch. Here, we show that proliferating ECs increasingly depend on mitochondrial oxidative phosphorylation (OxPhos) for their increased energy demand. Under growth conditions, ECs consume three times more oxygen than quiescent ECs and work close to their respiratory limit. The increased utilization of the proton motif force leads to a reduced mitochondrial membrane potential in proliferating ECs and sensitizes to mitochondrial uncoupling. The benzoquinone embelin is a weak mitochondrial uncoupler that prevents neoangiogenesis during tumor growth and wound healing by exhausting the low respiratory reserve of proliferating ECs without adversely affecting quiescent ECs. We demonstrate that this can be exploited therapeutically by attenuating tumor growth in syngenic and xenograft mouse models. This novel metabolic targeting approach might be clinically valuable in controlling pathological neoangiogenesis while sparing normal vasculature and complementing cytostatic drugs in cancer treatment.
journal_name
EMBO Mol Medjournal_title
EMBO molecular medicineauthors
Coutelle O,Hornig-Do HT,Witt A,Andree M,Schiffmann LM,Piekarek M,Brinkmann K,Seeger JM,Liwschitz M,Miwa S,Hallek M,Krönke M,Trifunovic A,Eming SA,Wiesner RJ,Hacker UT,Kashkar Hdoi
10.1002/emmm.201303016subject
Has Abstractpub_date
2014-05-01 00:00:00pages
624-39issue
5eissn
1757-4676issn
1757-4684pii
emmm.201303016journal_volume
6pub_type
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