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IGF-1 receptor regulates lifespan and resistance to oxidative stress in mice

机译:IGF-1受体调节小鼠的寿命和抗氧化应激能力

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Studies in invertebrates have led to the identification of a number of genes that regulate lifespan, some of which encode components of the insulin or insulin-like signalling pathways. Examples include the related tyrosine kinase receptors InR (Drosophila melanogaster) and DAF-2 (Caenorhabditis elegans) that are homologues of the mammalian insulin-like growth factor type 1 receptor (IGF-1R). To investigate whether IGF-1R also controls longevity in mammals, we inactivated the IGF-1R gene in mice (Igf1r). Here, using heterozygous knockout mice because null mutants are not viable, we report that Igf1r~(+/-) mice live on average 26% longer than their wild-type littermates (P < 0.02). Female Igf1r~(+/-) mice live 33% longer than wild-type females (P < 0.001), whereas the equivalent male mice show an increase in lifespan of 16%, which is not statistically significant. Long-lived Igf1r~(+/-) mice do not develop dwarf-ism, their energy metabolism is normal, and their nutrient uptake, physical activity, fertility and reproduction are unaffected. The Igf1r~(+/-) mice display greater resistance to oxidative stress, a known determinant of ageing. These results indicate that the IGF-1 receptor may be a central regulator of mammalian lifespan.
机译:对无脊椎动物的研究已导致鉴定出许多调节寿命的基因,其中一些编码胰岛素或类胰岛素信号通路的成分。实例包括相关的酪氨酸激酶受体InR(果蝇(Drosophila melanogaster))和DAF-2(秀丽隐杆线虫(Caenorhabditis elegans)),它们是哺乳动物胰岛素样生长因子1型受体(IGF-1R)的同源物。为了研究IGF-1R是否也能控制哺乳动物的寿命,我们使小鼠(Igf1r)中的IGF-1R基因失活。在这里,由于无效突变体是不可行的,所以使用杂合敲除小鼠,我们报告Igf1r〜(+/-)小鼠的寿命平均比野生型同窝小鼠长26%(P <0.02)。雌性Igf1r〜(+/-)小鼠的寿命比野生型雌性小鼠长33%(P <0.001),而同等的雄性小鼠的寿命增加16%,这在统计学上没有统计学意义。寿命长的Igf1r〜(+/-)小鼠不会出现侏儒症,其能量代谢正常,其养分吸收,体力活动,繁殖力和繁殖均未受到影响。 Igf1r〜(+/-)小鼠表现出对氧化应激的更大抵抗力,氧化应激是衰老的已知决定因素。这些结果表明,IGF-1受体可能是哺乳动物寿命的中央调节剂。

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