TY - JOUR TI - Salt-inducible kinases mediate nutrient-sensing to link dietary sugar and tumorigenesis in Drosophila AU - Hirabayashi, Susumu AU - Cagan, Ross L A2 - Pan, Duojia VL - 4 PY - 2015 DA - 2015/11/17 SP - e08501 C1 - eLife 2015;4:e08501 DO - 10.7554/eLife.08501 UR - https://doi.org/10.7554/eLife.08501 AB - Cancer cells demand excessive nutrients to support their proliferation but how cancer cells sense and promote growth in the nutrient favorable conditions remain incompletely understood. Epidemiological studies have indicated that obesity is a risk factor for various types of cancers. Feeding Drosophila a high dietary sugar was previously demonstrated to not only direct metabolic defects including obesity and organismal insulin resistance, but also transform Ras/Src-activated cells into aggressive tumors. Here we demonstrate that Ras/Src-activated cells are sensitive to perturbations in the Hippo signaling pathway. We provide evidence that nutritional cues activate Salt-inducible kinase, leading to Hippo pathway downregulation in Ras/Src-activated cells. The result is Yorkie-dependent increase in Wingless signaling, a key mediator that promotes diet-enhanced Ras/Src-tumorigenesis in an otherwise insulin-resistant environment. Through this mechanism, Ras/Src-activated cells are positioned to efficiently respond to nutritional signals and ensure tumor growth upon nutrient rich condition including obesity. KW - Drosophila KW - salt-inducible kinase KW - Hippo pathway KW - cancer JF - eLife SN - 2050-084X PB - eLife Sciences Publications, Ltd ER -