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Radiosensitivity of Cancer Stem Cells in Lung Cancer Cell Lines
Published on: August 21, 2019
Chk1 knockdown confers radiosensitization in prostate cancer stem cells
Xiaobin Wang1, Zhikun Ma, Zheng Xiao
1Department of Urology, The First Affiliated Hospital of Henan University of Science and Technology, Luoyang 471003, PR China.
Oncology Reports
|October 3, 2012
Summary
Inhibiting Chk1 (a DNA damage response protein) in prostate cancer stem cells enhances their sensitivity to radiation therapy. This approach may improve treatment outcomes for localized prostate cancer.
Area of Science:
- Oncology
- Cancer Stem Cell Biology
- Radiotherapy Resistance
Background:
- Radioresistance is a key factor in radiotherapy failure for localized prostate cancer.
- Prostate cancer stem cells contribute to radioresistance by activating DNA damage response pathways.
- Chk1 inhibition is a known sensitizer for various tumor cells to radiation.
Purpose of the Study:
- To investigate if Chk1 inhibition can enhance the efficacy of radiation therapy on prostate cancer stem cells.
- To determine the effects of Chk1 knockdown on the DNA damage response and cell cycle progression in these cells.
Main Methods:
- Isolation of CD133+CD44+ prostate cancer stem cells using microbeads.
- Chk1 knockdown in isolated cells via short hairpin RNA (shRNA).
- Assessment of cell cycle arrest, DNA repair, mitosis, apoptosis, and related protein activities post-irradiation.
Main Results:
- Chk1 knockdown abrogated radiation-induced G2/M arrest and inhibited DNA damage repair.
- Premature mitosis and increased apoptosis were observed in Chk1-knockdown cells after radiation.
- Caspase-2 activation and inactivation of phosphorylated Cdc25C and Cdc2 accompanied these effects.
Conclusions:
- Chk1 knockdown significantly increases the radiosensitivity of CD133+CD44+ prostate cancer stem cells.
- Targeting Chk1 in prostate cancer stem cells represents a potential therapeutic strategy to overcome radioresistance.
