IU1 suppresses proliferation of cervical cancer cells through MDM2 degradation

Area of Science:

• Oncology
• Molecular Biology
• Biochemistry

Background:

• The antitumor potential of IU1 is linked to selective inhibition of ubiquitin-specific protease 14 (USP14).
• Murine double minute 2 (MDM2) is overexpressed in various cancers, including cervical cancer, and is crucial for tumor progression.
• USP15 and USP7 stabilize MDM2 protein by removing ubiquitin chains, but USP14's role in MDM2 regulation is less understood.

Purpose of the Study:

• To investigate the molecular mechanisms of IU1's antitumor activity in cervical cancer.
• To examine the interaction between USP14 and MDM2 in cervical cancer cells.
• To determine the effect of IU1 on MDM2 protein expression and degradation pathways.

Main Methods:

• Treatment of HeLa cervical cancer cells with IU1.
• Analysis of cell proliferation, cell cycle progression, and apoptosis.
• Investigation of MDM2 protein levels and its interaction with USP14.
• Assessment of ubiquitin-proteasome system (UPS) and autophagy-lysosomal degradation pathways.

Main Results:

• IU1 treatment significantly reduced MDM2 protein expression in HeLa cells.
• IU1 activated both autophagy-lysosomal and ubiquitin-proteasome system (UPS) degradation pathways.
• IU1 blocked G0/G1 to S phase transition, decreased cell growth, and induced apoptosis.
• Evidence of USP14-MDM2 protein interaction was observed.

Conclusions:

• IU1 induces MDM2 degradation by simultaneously targeting the UPS and autophagy-lysosomal systems.
• IU1 exhibits antitumor effects in cervical cancer by inhibiting cell proliferation and promoting apoptosis.
• These findings elucidate the molecular mechanisms underlying IU1's therapeutic potential in cervical cancer.