MRE11 as a molecular signature and therapeutic target for cancer treatment with radiotherapy

Area of Science:

• Oncology
• Molecular Biology
• Radiation Oncology

Background:

• MRE11 (MRE11/RAD50/NBS1 complex) is a key DNA damage response protein.
• Its expression in cancer cells is linked to radioresistance and patient survival, though findings vary.
• Ionizing radiation can truncate MRE11, potentially affecting its function and explaining paradoxical survival data.

Purpose of the Study:

• To review the role of MRE11 in cancer radioresistance.
• To discuss biological modulation of MRE11 expression and potential therapeutic targeting.
• To explore MRE11's nuclease and non-nuclease activities in response to ionizing radiation.

Main Methods:

• Literature review of MRE11's role in DNA damage response and cancer radiotherapy.
• Analysis of research on MRE11 expression, truncation, and functional activities.
• Discussion of potential therapeutic strategies involving MRE11 inhibitors.

Main Results:

• Elevated MRE11 expression is often associated with poor survival in radiotherapy patients.
• Ionizing radiation-induced MRE11 truncation can decrease its efficacy.
• MRE11 exhibits both nuclease and non-nuclease activities crucial for DNA repair.

Conclusions:

• MRE11 is a promising target for radiosensitization strategies.
• Understanding MRE11's dual activities is vital for developing effective therapies.
• MRE11 expression may aid in stratifying cancer patients for radiotherapy and developing novel treatment approaches.