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Autophagic degradation of CDK4 is responsible for G0/G1 cell cycle arrest in NVP-BEZ235-treated neuroblastoma

Zhen Liu1,2, Xiao-Yang Wang3, Han-Wei Wang4

  • 1Department of Clinical Laboratory, Shanghai First Maternity and Infant Hospital, School of Medicine, Tongji University, Shanghai, China.

Cancer Biology & Therapy
|August 1, 2024
PubMed
Abstract

Insights

Targeting CDK4 degradation via autophagy is a novel therapeutic strategy for neuroblastoma (NB). This study reveals that autophagy, mediated by p62 and CTSB, degrades CDK4, inducing cell cycle arrest in NB cells.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Medicine

Background:

  • Cyclin-dependent kinase 4 (CDK4) is highly expressed in advanced neuroblastoma (NB), correlating with poor prognosis and reduced survival.
  • Targeting CDK4 degradation offers a promising therapeutic avenue beyond traditional CDK4 inhibitors.
  • The role of autophagic degradation of CDK4 and its anti-proliferative effects in NB cells remained uncharacterized.

Purpose of the Study:

  • To investigate the role of autophagy in CDK4 degradation within neuroblastoma cells.
  • To elucidate the mechanism of CDK4 autophagic degradation and its impact on cell cycle progression.
  • To explore the therapeutic potential of targeting CDK4 degradation in neuroblastoma.

Main Methods:

  • Investigated CDK4 degradation using autophagy inhibition and gene blockade in NVP-BEZ235 treated NB cells.
  • Utilized p62 and CTSB (cathepsin B) to demonstrate the mechanism of CDK4 binding and lysosomal degradation.
  • Validated findings in a neuroblastoma xenograft mouse model.

Main Results:

  • Autophagic degradation of CDK4 was identified as a critical mechanism for NVP-BEZ235-induced G0/G1 cell cycle arrest.
  • Overexpression of CDK4 and inhibition of autophagy confirmed the dependency of cell cycle arrest on CDK4 degradation.
  • p62 was found to bind CDK4, facilitating its lysosomal degradation in a CTSB-dependent manner in NB cells and xenografts.

Conclusions:

  • Autophagic degradation of CDK4 is a key mediator of G0/G1 cell cycle arrest in neuroblastoma cells treated with NVP-BEZ235.
  • This pathway represents a novel therapeutic target for neuroblastoma treatment.
Keywords:
CDK4NVP-BEZ235P62autophagic degradationneuroblastoma

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