Transcriptomic Analysis of DNA Repair Pathways in Human Non-Small Cell Lung Cancer Cells Surviving Multifraction...

Area of Science:

• Oncology
• Molecular Biology
• Radiation Oncology

Background:

• Non-small cell lung cancer (NSCLC) exhibits varying responses to radiation therapy.
• The p53 tumor suppressor protein plays a critical role in cellular response to DNA damage, including radiation-induced damage.
• Understanding the molecular mechanisms underlying radioresistance is crucial for improving NSCLC treatment outcomes.

Purpose of the Study:

• To investigate the characteristics of radioresistant NSCLC sublines with different p53 statuses.
• To analyze changes in gene expression and DNA repair pathways in cells that survived radiation exposure.
• To compare the responses of p53 wild-type and p53-deficient NSCLC cells to ionizing radiation.

Main Methods:

• Establishment of radioresistant NSCLC sublines (A549 - wild-type p53, H1299 - p53-deficient).
• Irradiation protocol: 2 Gy daily, 5 days/week, up to a total dose of 60 Gy.
• Analysis of differential gene expression and investigation of DNA repair signaling pathways in surviving cells.

Main Results:

• Irradiated cells demonstrated reduced radiosensitivity compared to parental cells.
• Significant changes in differential gene expression were observed in surviving radioresistant cells.
• Distinct differences were identified in the signaling pathways involved in DNA repair between the cell lines.

Conclusions:

• p53 status influences the development of radioresistance in NSCLC.
• Radiation exposure induces significant molecular alterations, including changes in gene expression and DNA repair mechanisms.
• Further research into these altered pathways may identify novel targets for overcoming radioresistance in NSCLC.