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2015 ; 13
(8
): e1002239
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Dally Proteoglycan Mediates the Autonomous and Nonautonomous Effects on Tissue
Growth Caused by Activation of the PI3K and TOR Pathways
#MMPMID26313758
Ferreira A
; Milán M
PLoS Biol
2015[Aug]; 13
(8
): e1002239
PMID26313758
show ga
How cells acquiring mutations in tumor suppressor genes outcompete neighboring
wild-type cells is poorly understood. The phosphatidylinositol 3-kinase
(PI3K)-phosphatase with tensin homology (PTEN) and tuberous sclerosis complex
(TSC)-target of rapamycin (TOR) pathways are frequently activated in human
cancer, and this activation is often causative of tumorigenesis. We utilized the
Gal4-UAS system in Drosophila imaginal primordia, highly proliferative and
growing tissues, to analyze the impact of restricted activation of these pathways
on neighboring wild-type cell populations. Activation of these pathways leads to
an autonomous induction of tissue overgrowth and to a remarkable nonautonomous
reduction in growth and proliferation rates of adjacent cell populations. This
nonautonomous response occurs independently of where these pathways are
activated, is functional all throughout development, takes place across
compartments, and is distinct from cell competition. The observed autonomous and
nonautonomous effects on tissue growth rely on the up-regulation of the
proteoglycan Dally, a major element involved in modulating the spreading,
stability, and activity of the growth promoting Decapentaplegic
(Dpp)/transforming growth factor ?(TGF-?) signaling molecule. Our findings
indicate that a reduction in the amount of available growth factors contributes
to the outcompetition of wild-type cells by overgrowing cell populations. During
normal development, the PI3K/PTEN and TSC/TOR pathways play a major role in
sensing nutrient availability and modulating the final size of any developing
organ. We present evidence that Dally also contributes to integrating nutrient
sensing and organ scaling, the fitting of pattern to size.