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Vol. 16, No. 20, pp. 2627-2632, October 15, 2002
1 Friedrich Miescher Institute for Biomedical Research,
CH-4058, Basel, Switzerland; 2 Novartis Pharma AG,
CH-4056 Basel, Switzerland
Tuberous sclerosis complex (TSC) is a genetic disorder caused by
mutations in one of two tumor suppressor genes, TSC1 and TSC2. Here, we show that absence of Drosophila Tsc1/2
leads to constitutive dS6K activation and inhibition of dPKB, the
latter effect being relieved by loss of dS6K. In contrast, the dPTEN tumor suppressor, a negative effector of PI3K, has little effect on
dS6K, but negatively regulates dPKB. More importantly, we demonstrate that reducing dS6K signaling rescues early larval lethality associated with loss of dTsc1/2 function, arguing that the S6K pathway is a
promising target for the treatment of TSC.
[Key Words: growth; TSC; S6K; TOR; PTEN; PKB]
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