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Visualization of the Oncolytic Alphavirus M1 Life Cycle in Cancer Cells

Jia Dan1, Lin Nie2, Xudong Jia2

  • 1Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, China.

Virologica Sinica
|January 22, 2021
PubMed

Insights

Oncolytic alphavirus M1 infects liver cancer cells, causing apoptosis and revealing its replication cycle. The endoplasmic reticulum aids in viral assembly, with special vacuoles involved in M1 virus maturation and release.

Area of Science:

  • Oncolytic virology
  • Cancer biology
  • Cellular microbiology

Background:

  • Oncolytic alphavirus M1 demonstrates selective cancer cell targeting.
  • The M1 virus's cytopathic effects and life cycle in cancer cells require further elucidation.

Purpose of the Study:

  • To investigate the M1 virus's infection and replication stages in HepG2 liver cancer cells.
  • To characterize the M1 virus's cytopathic morphologies and intracellular life cycle.

Main Methods:

  • Transmission electron microscopy (TEM) was employed to visualize M1 virus infection.
  • Key stages studied included viral entry, assembly, maturation, and release in HepG2 cells.

Main Results:

  • M1 virus infection induced cancer cell vacuolization and nuclear marginalization, indicative of apoptosis.
  • The endoplasmic reticulum was implicated in nucleocapsid assembly.
  • Three distinct cytopathic vacuoles were observed, potentially involved in viral replication, maturation, and release.

Conclusions:

  • The study elucidates the M1 virus infection process in tumor cells.
  • Provides a structural basis for understanding M1 virus-host interactions.
Keywords:
AlphavirusElectron microscopyLife cycle of virusM1Oncolytic virus

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