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Enhancing Oncolytic Adenovirus Replication by Early Region 1A Protein-Mediated Degradation of E1A Binding Protein

Boduan Xiao1, Qingzhe Yang1, Shichuan Hu1

  • 1Department of Biotherapy，Cancer Center and State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu People's Republic of China.

Medcomm
|April 3, 2026
PubMed

Insights

Oncolytic adenovirus (OAd) therapy uses E1A to reduce p300 expression, enhancing viral replication and tumor cell killing. This mechanism offers a potential biomarker for OAd patient selection and novel cancer treatment strategies.

Area of Science:

  • Oncolytic virotherapy
  • Molecular oncology
  • Cancer immunology

Background:

  • Oncolytic adenovirus (OAd) is a promising cancer treatment, relying on viral replication.
  • Adenovirus E1A protein is crucial for viral replication.
  • Understanding E1A's regulatory role in OAd replication is vital for optimizing therapy.

Purpose of the Study:

  • To investigate the mechanism by which E1A regulates OAd replication.
  • To explore the interaction between E1A and the p300 protein.
  • To evaluate the therapeutic potential of enhancing OAd activity through p300 modulation.

Main Methods:

  • Western blot to detect p300 and E1A expression.
  • Virus replication assays to quantify OAd replication.
  • Immunofluorescence and immunoprecipitation to analyze E1A-p300 interaction.
  • MTT assays and animal experiments to assess therapeutic efficacy.

Main Results:

  • OAd infection or E1A overexpression reduced p300 expression.
  • p300 knockdown enhanced OAd viral replication and cancer cell cytotoxicity.
  • E1A promoted OAd replication by mediating p300 ubiquitination and inhibiting the IFI16/STING/IRF3/IFN-β pathway.
  • OAd engineered to knockdown p300 (OAd-shp300) showed enhanced replication and potent antitumor activity in vitro and in vivo.

Conclusions:

  • OAd utilizes E1A to promote p300 ubiquitination and degradation, enhancing viral replication and cytotoxicity.
  • This mechanism provides a potential biomarker for identifying patients responsive to OAd therapy.
  • Targeting p300 offers a novel strategy for improving clinical outcomes in OAd cancer treatment.
Keywords:
E1A binding protein p300early region 1A proteinoncolytic adenovirusviral replication

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