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Lethality of Drosophila lacking TSC tumor suppressor function rescued by reducing dS6K signaling
Thomas Radimerski1, Jacques Montagne, Maja Hemmings-Mieszczak
1Friedrich Miescher Institute for Biomedical Research, CH-4058, Basel, Switzerland.
Abstract:
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.
Insights
Tuberous sclerosis complex (TSC) is a genetic disorder. Reducing S6K signaling in flies rescues early lethality, suggesting the S6K pathway as a potential therapeutic target for TSC.
Area of Science:
- Genetics
- Molecular Biology
- Developmental Biology
Background:
- Tuberous sclerosis complex (TSC) is a genetic disorder caused by mutations in TSC1 or TSC2 tumor suppressor genes.
- The PI3K/AKT/mTOR pathway is implicated in TSC pathogenesis.
- Understanding the specific signaling nodes affected by TSC gene mutations is crucial for therapeutic development.
Purpose of the Study:
- To investigate the roles of Drosophila S6K (dS6K) and PKB (dPKB) in the context of Tsc1/2 loss.
- To determine the relationship between dS6K, dPKB, and dPTEN signaling in Drosophila.
- To identify potential therapeutic targets for TSC by examining the effects of modulating S6K signaling.
Main Methods:
- Utilized Drosophila melanogaster as a model organism.
- Investigated the effects of Tsc1/2 loss on dS6K and dPKB activity.
- Assessed the impact of dS6K and dPTEN on dPKB signaling.
- Examined the rescue of larval lethality by modulating dS6K signaling.
Main Results:
- Absence of Drosophila Tsc1/2 leads to constitutive dS6K activation and dPKB inhibition.
- Loss of dS6K function alleviates the inhibition of dPKB caused by Tsc1/2 loss.
- dPTEN negatively regulates dPKB but has minimal effect on dS6K.
- Reducing dS6K signaling rescues early larval lethality in Tsc1/2 mutants.
Conclusions:
- The S6K pathway plays a critical role in mediating the developmental defects associated with Tsc1/2 loss in Drosophila.
- Modulating S6K signaling presents a promising therapeutic strategy for treating TSC.
- The findings provide insights into the complex interplay of signaling pathways in TSC.