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In vitro Reconstitution of the Active T. castaneum Telomerase
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Cancer therapy with a CRISPR-assisted telomerase-activating gene expression system.

Wei Dai1, Xinhui Xu1, Danyang Wang1

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A novel telomerase-activating gene expression (Tage) system effectively targets cancer cells by exploiting telomerase activity. This gene therapy demonstrates significant in vivo efficacy and safety, offering a promising new avenue for cancer treatment.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Therapy

Background:

  • Cancer arises from genomic and epigenomic alterations, presenting complex treatment challenges.
  • Telomerase, active in most cancers but not normal cells, is a key therapeutic target.
  • Previous telomerase inhibitors failed due to side effects, necessitating alternative strategies.

Purpose of the Study:

  • To develop a novel cancer gene therapy utilizing cancer-specific telomerase activity.
  • To engineer a system that selectively targets and eliminates cancer cells.
  • To evaluate the in vitro and in vivo safety and efficacy of this new approach.

Main Methods:

  • Development of the telomerase-activating gene expression (Tage) system, incorporating a telomerase-recognizable DNA sequence and CRISPR-Cas9 components.
  • In vitro testing against a panel of human and mouse cancer cell lines and normal cells.
  • In vivo studies in mice using adeno-associated virus (AAV) vectors for systemic delivery.

Main Results:

  • The Tage system demonstrated potent cancer cell killing across multiple cancer types (HepG2, HeLa, PANC-1, MDA-MB-453, A549, HT-29, SKOV-3, Hepa1-6, RAW264.7).
  • Normal cells (MRC-5, HL7702, BMSC) remained unaffected, indicating high specificity.
  • In vivo administration via AAV vectors led to significant and specific tumor cell reduction in mice without observable toxicity or side effects.

Conclusions:

  • The Tage system represents a novel and effective strategy for cancer gene therapy by leveraging cancer-specific telomerase activation.
  • This approach offers a safe and targeted method for eliminating cancer cells both in vitro and in vivo.
  • The use of AAV vectors facilitates effective systemic delivery and therapeutic application.