Model of Accelerated Aging in CB6F2 Mice Induced by Ionizing Radiation

Area of Science:

• Gerontology
• Radiation Biology
• Toxicology

Background:

• Accelerated aging models are crucial for understanding age-related diseases.
• Radiation exposure is known to induce premature aging and increase cancer risk.

Purpose of the Study:

• To develop and validate a mouse model for studying radiation-induced accelerated aging.
• To investigate the long-term effects of ionizing radiation on lifespan and healthspan.

Main Methods:

• CB6F2 mice (39-45 days old) were exposed to fractionated gamma radiation (¹³⁷Cs) at a total dose of 6.8 Gy.
• Animals were monitored for lifespan, physiological changes (leukopenia, lymphopenia), and age-associated pathologies, including cancer.

Main Results:

• Irradiated mice exhibited delayed growth, persistent leukopenia and lymphopenia, and significantly reduced median lifespans (35-38% decrease).
• Early onset of hair depigmentation, cachexia, and aging-associated diseases, including a 2-fold increase in oncological pathology, were observed.
• The developed model demonstrated a clear link between radiation dose and accelerated aging phenotypes.

Conclusions:

• The developed mouse model effectively replicates key features of accelerated aging induced by ionizing radiation.
• This model provides a valuable tool for investigating the mechanisms of radiation-induced aging and for developing preventative or therapeutic strategies.