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Conditionally replicating adenovirus prevents pluripotent stem cell-derived teratoma by specifically eliminating

Kaoru Mitsui1, Kanako Ide2, Akiko Takayama2

  • 1Department of Gene Therapy and Regenerative Medicine, Kagoshima University Graduate School of Medical and Dental Sciences , Kagoshima, Japan ; Center for Innovative Therapy Research and Application, Kagoshima University Graduate School of Medical and Dental Sciences , Kagoshima, Japan.

Molecular Therapy. Methods & Clinical Development
|August 14, 2015
PubMed

Insights

Multifactor conditionally replicating adenoviruses (m-CRAs) effectively eliminate undifferentiated human pluripotent stem cells (hPSCs), preventing tumor formation. This discovery offers a novel strategy for enhancing the safety of hPSC-based regenerative medicine therapies.

Area of Science:

  • Regenerative Medicine
  • Oncolytic Virology
  • Stem Cell Biology

Background:

  • Tumorigenicity of human pluripotent stem cells (hPSCs) poses safety risks in regenerative medicine.
  • Anticancer agents, specifically oncolytic viruses, may offer solutions for stem cell safety.

Purpose of the Study:

  • To evaluate the potential of multifactor conditionally replicating adenoviruses (m-CRAs) as antitumorigenic agents in hPSC therapy.
  • To compare the efficacy of survivin-promoter-driven (Surv.m-CRA) versus TERT-promoter-driven (Tert.m-CRA) m-CRAs against hPSCs.

Main Methods:

  • Utilized survivin and TERT promoters to control m-CRA replication in hPSCs and differentiated cells.
  • Assessed viral replication, cytotoxicity, and antitumorigenic effects of m-CRAs in vitro and in vivo (teratoma formation).

Main Results:

  • Survivin promoter showed higher activity in undifferentiated hPSCs than TERT promoter.
  • Surv.m-CRA demonstrated superior killing of undifferentiated hPSCs compared to Tert.m-CRA.
  • Pre-treatment with m-CRAs dose-dependently abolished in vivo teratoma formation from hPSC implantation.

Conclusions:

  • m-CRAs, particularly Surv.m-CRAs, are effective antitumorigenic agents against hPSCs.
  • m-CRAs can significantly mitigate the tumorigenicity risk associated with hPSC-based therapies.
  • This approach holds promise for advancing the clinical application of hPSC-based regenerative medicine.

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