Embelin inhibits endothelial mitochondrial respiration and impairs neoangiogenesis during tumor growth and wound healing.

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 Med

journal_title

EMBO molecular medicine

authors

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 H

doi

10.1002/emmm.201303016

subject

Has Abstract

pub_date

2014-05-01 00:00:00

pages

624-39

issue

5

eissn

1757-4676

issn

1757-4684

pii

emmm.201303016

journal_volume

6

pub_type

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