MDM2 regulates the stability of AR, AR-V7, and TM4SF3 proteins in prostate cancer
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View abstract on PubMed
Summary
This summary is machine-generated.MDM2 E3 ligase targets androgen receptor (AR) and its variant AR-V7 for degradation. Inhibiting MDM2 stabilizes AR and AR-V7, promoting prostate cancer cell growth and migration.
Area Of Science
- Oncology
- Molecular Biology
- Biochemistry
Background
- Androgen receptor (AR) and its splice variant AR-V7 are key drivers of prostate cancer.
- Protein stability of AR and AR-V7 is regulated by the ubiquitination proteasomal pathway.
Purpose Of The Study
- To identify the E3 ligase responsible for the mutual stabilization of AR, AR-V7, and TM4SF3.
- To investigate the role of MDM2 in regulating AR, AR-V7, and TM4SF3 stability and its impact on prostate cancer progression.
Main Methods
- siRNA depletion of E3 ligases to identify MDM2.
- Pharmacological inhibition of MDM2 (MDM2i) and siRNA knockdown.
- Western blotting to assess protein levels and ubiquitination.
- Cell proliferation and migration assays.
Main Results
- MDM2 was identified as the common E3 ligase for AR, AR-V7, and TM4SF3.
- MDM2 inhibition or depletion led to increased levels of AR, AR-V7, and TM4SF3.
- MDM2 inhibition reduced ubiquitination of AR and TM4SF3.
- Increased AR/AR-V7 levels enhanced prostate cancer cell proliferation and migration.
Conclusions
- MDM2 plays a crucial role in the degradation of AR and AR-V7.
- MDM2 inhibition stabilizes AR and AR-V7, promoting prostate cancer progression.
- MDM2's role in TM4SF3 interaction with AR/AR-V7 expands its known functions in prostate cancer.
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