Ex Vivo Irradiation Protocol in Murine Lymph Node Cells

Area of Science:

• Radiation biology
• Molecular biology
• Immunology

Background:

• Assessing DNA damage and cellular response is crucial for understanding radiation effects.
• Developing efficient protocols for lymphoid tissue analysis is essential for radiosensitivity studies.

Purpose of the Study:

• To validate a method for isolating mouse lymph node cells for ex vivo irradiation studies.
• To characterize DNA damage and the expression of key proteins involved in repair, cell cycle arrest, and apoptosis post-irradiation.

Main Methods:

• Mouse lymph node cell suspensions were subjected to ex vivo X-ray irradiation (2 Gy).
• DNA damage was quantified using the comet assay.
• Levels of DNA repair (γH2AX, Rad51, XPA), cell cycle arrest (Cdc25A, p21, p16), and apoptosis (Bax, Bcl-2) proteins were analyzed.

Main Results:

• Irradiation significantly increased DNA damage (7-fold) and levels of repair proteins (γH2AX, Rad51, XPA) and cell cycle arrest proteins (Cdc25A, p21, p16).
• Pro-apoptotic protein Bax increased significantly, while Bcl-2 levels remained unchanged.
• The protocol allows for rapid sample preparation for radiosensitivity assessment.

Conclusions:

• The developed protocol effectively isolates lymphoid tissue for radiosensitivity analysis.
• Ex vivo irradiation induces measurable DNA damage and modulates critical cellular response pathways in mouse lymphoid cells.
• This method is valuable for studying radiosensitivity in various mouse strains and experimental conditions.