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Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
Published on: June 7, 2019
Antagonistic TSC22D1 variants control BRAF(E600)-induced senescence
Cornelia Hömig-Hölzel1, Remco van Doorn, Celia Vogel
1Division of Molecular Genetics, The Netherlands Cancer Institute, Amsterdam, The Netherlands.
Oncogene-induced cellular senescence (OIS) suppresses tumors by regulating TGFβ-stimulated clone 22 (TSC22D1) variants. Differential regulation of these TSC22D1 forms is crucial for establishing OIS and controlling BRAF(E600) driven cancers.
Area of Science:
- Molecular Biology
- Cell Biology
- Cancer Research
Background:
- Oncogene-induced cellular senescence (OIS) is a key tumor suppressor mechanism.
- The molecular pathways governing OIS are complex and not fully understood.
Purpose of the Study:
- To investigate the role of TGFβ-stimulated clone 22 (TSC22D1) in OIS.
- To elucidate the functions of different TSC22D1 protein variants in senescence.
Main Methods:
- Gene-expression profiling in human fibroblasts and melanocytes.
- Analysis of TSC22D1 transcript and protein variant levels.
- Manipulation of TSC22D1 variant expression and function.
Main Results:
- TSC22D1 showed a >100-fold increase in BRAF(E600)-induced senescence.
- Only the short TSC22D1 transcript was upregulated; the large variant was suppressed.
- Differential regulation of TSC22D1 variants, in complex with THG1, controlled OIS establishment.
- TSC22D1 variants exerted opposing functions, impacting inflammatory factors and p15(INK4B).
Conclusions:
- The differential regulation of antagonistic TSC22D1 variants is essential for OIS.
- TSC22D1 acts as a critical effector of C/EBPβ in OIS.
- Distinct TSC22 family members may contribute differently to BRAF(E600)-driven neoplasia.
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