Journal
GENETICS
Volume 215, Issue 4, Pages 1013-1025Publisher
GENETICS SOCIETY AMERICA
DOI: 10.1534/genetics.120.303219
Keywords
hypoxia; Drosophila; FOXO; NF-kappa B; glucose metabolism; immunity; HIF-1 alpha
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Funding
- National Institutes of Health [P40 OD-018537]
- Government du Canada, National Sciences and Engineering Research Council of Canada (NSERC)
- Alberta Innovates Health Solutions Graduate Studentship
- NSERC summer studentship
- NSERC CGS-M graduate scholarship
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Exposure of tissues and organs to low oxygen (hypoxia) occurs in both physiological and pathological conditions in animals. Under these conditions, organisms have to adapt their physiology to ensure proper functioning and survival. Here, we define a role for the transcription factor Forkhead Box-O (FOXO) as a mediator of hypoxia tolerance inDrosophila. We find that upon hypoxia exposure, FOXO transcriptional activity is rapidly induced in both larvae and adults. Moreover, we see thatmutant animals show misregulated glucose metabolism in low oxygen and subsequently exhibit reduced hypoxia survival. We identify the innate immune transcription factor, NF-kappa B/Relish, as a key FOXO target in the control of hypoxia tolerance. We find that expression of Relish and its target genes is increased in a FOXO-dependent manner in hypoxia, and thatrelishmutant animals show reduced survival in hypoxia. Together, these data indicate that FOXO is a hypoxia-inducible factor that mediates tolerance to low oxygen by inducing immune-like responses.
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