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Induction and Validation of Cellular Senescence in Primary Human Cells
Published on: June 20, 2018
Jun and JunD-dependent functions in cell proliferation and stress response
A Meixner1, F Karreth, L Kenner
1Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna, Austria.
Cell Death and Differentiation
|March 20, 2010
Summary
Jun protein is vital for fetal development, preventing liver and heart defects. While JunD partially compensates, it cannot fully replace Jun's role in cellular protection against oxidative stress and senescence.
Area of Science:
- Molecular Biology
- Developmental Biology
- Cellular Biology
Background:
- Jun is crucial for fetal development, with its absence leading to mid-gestation lethality and cellular defects in the liver and heart.
- JunD can partially rescue fetal development but fails to prevent cardiac defects, indicating Jun's unique functions.
Purpose of the Study:
- To investigate the functional role of Jun in fetal development, cellular senescence, and protection against oxidative stress.
- To determine if JunD can functionally replace Jun in these processes.
Main Methods:
- Comparative analysis of Jun-deficient (Jun(-/-)) and JunD-substituted (Jun(d/d)) mouse models.
- Assessment of fetal development, liver and heart cellular integrity, fibroblast senescence, and oxidative stress markers (hydrogen peroxide, Nrf1/Nrf2 expression).
- Evaluation of epidermal growth factor (EGF) and HB-EGF rescue effects on fibroblast senescence.
Main Results:
- Jun(-/-) fetuses exhibit lethality, liver, and heart defects.
- JunD substitution rescues liver development but not cardiac defects, and Jun(d/d) fibroblasts show premature senescence.
- Jun deficiency leads to increased oxidative stress and downregulated Nrf1/Nrf2 in fetal livers, which are rescued by JunD.
- Fibroblast senescence in Jun(d/d) MEFs is rescued by EGF/HB-EGF, suggesting Akt pathway involvement.
Conclusions:
- Jun is essential for protecting fetal livers and fibroblasts against oxidative stress.
- Jun plays a critical role in preventing cellular senescence, a process that can be restored by epidermal growth factor receptor pathway activation.
- JunD cannot fully substitute for Jun's essential functions in fetal development and cellular homeostasis.
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