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Sustained baculovirus-mediated expression in myogenic cells.

Heng-Chun Shen1, Chia-Ni Yeh, Guan-Yu Chen

  • 1Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan.

The Journal of Gene Medicine
|August 30, 2008
PubMed
Summary

Baculovirus gene delivery shows sustained transgene expression in differentiating myotubes, lasting over 63 days. This overcomes transient expression limitations, supporting its use in muscle gene therapy.

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Area of Science:

  • Biotechnology
  • Gene Therapy
  • Cell Biology

Background:

  • Baculovirus is a promising gene delivery vector with low cytotoxicity.
  • Baculovirus-mediated expression is typically transient (<14 days) in mammalian cells.
  • This transient nature limits applications requiring stable transgene expression.

Purpose of the Study:

  • To investigate the longevity of baculovirus-mediated transgene expression in muscle cells.
  • To determine if baculovirus can achieve sustained gene expression for potential muscle-based gene therapy.

Main Methods:

  • Transduction of myoblast cell lines (C2C12, Sol 8) and primary myoblasts with baculovirus encoding EGFP.
  • Monitoring EGFP expression via flow cytometry and fluorescence microscopy.
  • Assessing myogenic differentiation using RT-PCR and quantifying DNA/mRNA persistence via real-time PCR.

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Main Results:

  • Baculovirus efficiently transduced various myoblast cell types.
  • Sustained EGFP expression (≥63 days) observed in differentiating myotubes, contrasting with transient expression (<7 days) in HeLa cells.
  • Sustained expression correlated with myogenic differentiation and intracellular persistence of EGFP DNA and mRNA.

Conclusions:

  • Baculovirus-delivered transgenes persist in myotubes, enabling sustained expression.
  • This sustained expression in muscle cells is distinct from rapid degradation in other cell types.
  • Findings support baculovirus as a viable vector for muscle-based gene therapy.