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A novel role mediated by adenoviral E1A in suppressing cancer through modulating decorin

Yan Ge1,2, Wen Zhang1, Jing Qin1

  • 1Cancer Institute, Xuzhou Medical University, Xuzhou, Jiangsu, China.

Medical Oncology (Northwood, London, England)
|October 30, 2019
PubMed

Insights

Adenoviral E1A protein enhances decorin expression and reduces VEGF, inhibiting lung cancer cell migration and invasion. This mechanism, mediated by decorin, offers a novel approach for oncolytic adenovirus gene therapy.

Area of Science:

  • Oncolytic virotherapy
  • Cancer extracellular matrix biology
  • Gene therapy

Background:

  • Oncolytic adenoviruses show therapeutic potential, but mechanisms of tumor inhibition by adenoviral E1A protein are not fully understood.
  • Decorin, an extracellular matrix component, plays a role in regulating cellular functions.
  • Reduced decorin expression is observed in lung cancer patients.

Purpose of the Study:

  • To investigate the impact of adenoviral E1A on the tumor extracellular matrix during gene therapy.
  • To elucidate the role of decorin in adenoviral E1A-mediated antitumor activity.

Main Methods:

  • Analysis of decorin expression in lung cancer patients.
  • Treatment of lung cancer cells and xenografts with adenoviral E1A and a mutant E1A.
  • Assessment of decorin and VEGF expression, cell migration, invasion, and tumor growth.
  • Investigation of E1A-decorin interaction and VEGF degradation pathways.

Main Results:

  • Adenoviral E1A and a mutant E1A (lacking Rb-binding ability) increased decorin expression and decreased VEGF levels in tumor cells.
  • Decorin mediated the suppression of lung cancer cell migration and invasion by E1A/mutant E1A.
  • E1A directly interacted with decorin and promoted proteasomal degradation of VEGF.
  • E1A and mutant E1A inhibited tumor growth in a lung cancer xenograft model.

Conclusions:

  • Decorin is a crucial mediator of adenoviral E1A-mediated antitumor effects by modulating the tumor extracellular matrix.
  • Adenoviral E1A's ability to upregulate decorin and downregulate VEGF presents a novel mechanism for oncolytic adenovirus gene therapy against lung cancer.
Keywords:
Adenoviral E1ADecorinExtracellular matrixLung carcinomaVEGF

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