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hTERT-targeted RNA interference inhibits tumorigenicity and motility of HCT116 cells

Ying Shen1, Yong-Wei Zhang, Zhi-Xiang Zhang

  • 1Division of Anti-Tumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.

Cancer Biology & Therapy
|December 7, 2007
PubMed

Insights

This study shows that a novel small interfering RNA (siRNA) targeting human telomerase reverse transcriptase (hTERT) effectively inhibits cancer cell growth and tumor formation. The hTERT siRNA also reduces cancer cell migration and adhesion, independent of telomere length.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Telomerase is a key target for anticancer therapies.
  • Emerging evidence suggests telomerase has roles beyond telomere extension.
  • Human telomerase reverse transcriptase (hTERT) is the catalytic subunit of telomerase.

Purpose of the Study:

  • To investigate the therapeutic potential of a small interfering RNA (siRNA) targeting hTERT.
  • To determine the effects of hTERT depletion on cancer cell behavior and tumorigenicity.
  • To explore the role of hTERT in functions independent of telomere extension.

Main Methods:

  • Designed and utilized siRNA targeting hTERT in telomerase-positive HCT116 colon cancer cells.
  • Employed transient and persistent transfection methods.
  • Assessed hTERT expression, telomerase activity, cell proliferation, adhesion, migration, invasion, and in vivo tumorigenicity.

Main Results:

  • hTERT siRNA significantly suppressed hTERT expression and telomerase activity.
  • hTERT depletion inhibited HCT116 cell growth and in vivo tumor formation.
  • Reduced cell adhesion, migration, and invasion were observed prior to proliferation inhibition.
  • Downregulation of hTERT decreased expression of c-Met and integrins.
  • No significant effect on telomere length was detected.

Conclusions:

  • A novel hTERT siRNA demonstrates significant therapeutic potential against colon cancer.
  • hTERT plays a crucial role in regulating cancer cell motility and adhesion independently of telomere length.
  • Targeting hTERT offers a promising strategy for cancer treatment by affecting both proliferation and metastasis.

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