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- W3177387616 abstract "In almost all animals, physiologically low oxygen (hypoxia) during development slows growth and reduces adult body size 1–3 . The developmental mechanisms that determine growth under hypoxic conditions are, however, poorly understood. One hypothesis is that the effect of hypoxia on growth and final body size is a non-adaptive consequence of the cell-autonomous effects of hypoxia on cellular metabolism. Alternatively, the effect may be an adaptive coordinated response mediated through systemic physiological mechanisms. Here we show that the growth and body size response to moderate hypoxia (10% O 2 ) in Drosophila melanogaster is systemically regulated via the steroid hormone ecdysone, acting partially through the insulin-binding protein Imp-L2. Ecdysone is necessary to reduce growth in response to hypoxia: hypoxic growth suppression is ameliorated when ecdysone synthesis is inhibited. This hypoxia-suppression of growth is mediated by the insulin/IGF-signaling (IIS) pathway. Hypoxia reduces systemic IIS activity and the hypoxic growth-response is eliminated in larvae with suppressed IIS. Further, loss of Imp-L2 , an ecdysone-response gene that suppresses systemic IIS, significantly reduces the negative effect of hypoxia on final body size. Collectively, these data indicate that growth suppression in hypoxic Drosophila larvae is accomplished by systemic endocrine mechanisms rather than direct suppression of tissue aerobic metabolism." @default.
- W3177387616 created "2021-07-05" @default.
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- W3177387616 date "2021-06-25" @default.
- W3177387616 modified "2023-09-27" @default.
- W3177387616 title "A steroid hormone regulates growth in response to oxygen availability" @default.
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- W3177387616 doi "https://doi.org/10.1101/2021.06.25.449962" @default.
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