Mutant p53 upregulates HDAC6 to resist ER stress and facilitates Ku70 deacetylation, which prevents its degradation and mitigates DNA damage in colon cancer cells
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View abstract on PubMed
Summary
This summary is machine-generated.Mutant p53 (mutp53) enhances cancer cell survival by protecting against endoplasmic reticulum (ER) stress. It achieves this by upregulating HDAC6, which aids DNA repair and promotes resistance to ER stress-induced damage.
Area Of Science
- Molecular Biology
- Cancer Biology
- Cellular Stress Response
Background
- Cancer cells utilize complex mechanisms to survive stress.
- Mutant p53 (mutp53) is implicated in resistance to endoplasmic reticulum (ER) stress.
- ER stress can trigger DNA damage in cancer cells.
Purpose Of The Study
- To investigate how mutp53 confers resistance to ER stress-induced DNA damage.
- To identify key molecular players involved in this protective mechanism.
Main Methods
- Analysis of protein levels (Ku70, Ku80, HDAC6, ATF6).
- Investigation of protein modification (deacetylation) and localization.
- Assessment of DNA repair pathway activity (non-homologous end joining - NHEJ).
- Evaluation of unfolded protein response (UPR) activation.
Main Results
- Mutp53 sustains high levels of Ku70, essential for NHEJ DNA repair.
- HDAC6 upregulation is critical, deacetylating Ku70 and promoting its nuclear localization and stability.
- HDAC6 also maintains ATF6 activation, enhancing ER stress resistance.
- This mutp53-driven mechanism facilitates repair of ER stress-induced DNA damage.
Conclusions
- Mutp53 confers enhanced resistance to ER stress-induced DNA damage through the Ku70/NHEJ pathway, driven by HDAC6.
- HDAC6 plays a dual role in promoting DNA repair and UPR activation, bolstering cancer cell survival under stress.
- Targeting HDAC6 presents a potential therapeutic strategy to sensitize mutp53 cancer cells to ER stress.
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