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Detecting the Ligand-binding Domain Dimerization Activity of Estrogen Receptor Alpha Using the Mammalian Two-Hybrid Assay
Published on: December 19, 2018
PC-1 works in conjunction with E3 ligase CHIP to regulate androgen receptor stability and activity
Jian Wang1, Hui Zhang2, Xiaoqing Zhang1
1Laboratory of Medical Molecular Biology, Beijing Institute of Biotechnology, Beijing 100850, China.
Abstract:
The androgen receptor (AR) is not only a ligand-dependent transcription factor, but also functions as a licensing factor, a component of DNA replication, which is degraded during mitosis. Furthermore, the deregulation of AR activity is involved in the initiation of prostate cancer and contributes to castration resistant prostate cancer (CRPC). While AR degradation is known to occur primarily through a proteasome-mediated pathway, very little is known about how this process is regulated, especially in M phase. PC-1 is an androgen-responsive factor and expresses specificity in prostate cancer, with higher expression noted at G2/M. In this study, PC-1 was shown to interact with AR and E3 ligase CHIP (Carboxy-terminus of Hsc70 Interacting Protein) and to enhance AR/CHIP interactions, thereby decreasing AR stability. Moreover, PC-1 was found to act in conjunction with CHIP in the decreasing of AR via ubiquitination, with the subsequent degradation predominantly occurring during M phase. PC-1 was also found to repress AR transcriptional activity in androgen-dependent and androgen-independent prostate cancer cells and attenuate the growth inhibition of AR. In conclusion, these findings should provide new clues regarding the modulation of AR turnover and activity via PC-1 and reveals an essential role of PC-1 in AR signaling.
Insights
The androgen receptor (AR) is degraded during mitosis, and PC-1 enhances this process by interacting with AR and E3 ligase CHIP. This interaction regulates AR stability and activity, impacting prostate cancer progression.
Area of Science:
- Molecular Biology
- Cell Biology
- Cancer Research
Background:
- The androgen receptor (AR) is a key regulator in prostate cancer, and its degradation is crucial for cell cycle progression.
- AR deregulation contributes to castration-resistant prostate cancer (CRPC).
- Regulation of AR degradation, particularly during mitosis (M phase), remains poorly understood.
Purpose of the Study:
- To investigate the role of PC-1 in regulating androgen receptor (AR) stability and activity.
- To elucidate the mechanism by which PC-1 influences AR degradation during the cell cycle.
Main Methods:
- Co-immunoprecipitation assays to assess protein interactions (AR, PC-1, CHIP).
- Western blotting to evaluate AR protein levels and stability.
- Ubiquitination assays to detect AR modification.
- Reporter assays to measure AR transcriptional activity.
Main Results:
- PC-1 interacts with AR and enhances its interaction with the E3 ligase CHIP.
- PC-1 promotes AR ubiquitination and degradation, predominantly during M phase.
- PC-1 represses AR transcriptional activity in both androgen-dependent and independent prostate cancer cells.
- PC-1 attenuates growth inhibition mediated by AR.
Conclusions:
- PC-1 plays a critical role in modulating androgen receptor (AR) turnover and activity.
- PC-1 enhances AR degradation via the CHIP-mediated ubiquitination pathway during M phase.
- PC-1 represents a potential therapeutic target for modulating AR signaling in prostate cancer.
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