Identifying and Implementing Endpoints for Geriatric Mice

Area of Science:

• Gerontology
• Comparative Medicine
• Animal Research

Background:

• Aging in humans and animals shares common physiological and behavioral changes.
• Existing rodent health scoring systems may not be optimal for aged populations.
• Frailty assessments offer a global health evaluation for aged rodents and humans.

Purpose of the Study:

• To evaluate the suitability of frailty assessments for aged rodents.
• To identify objective parameters for predicting imminent death in aging mice.
• To improve health monitoring and intervention strategies for elderly research animals.

Main Methods:

• Utilized frailty assessments for global health evaluation in aged mice.
• Monitored body weight and temperature as objective parameters.
• Correlated frailty scores and physiological parameters with mortality risk.

Main Results:

• Mouse frailty scores correlate with the likelihood of death.
• Reduced body weight and temperature are key indicators of impending death in many aged mice.
• These parameters facilitate prediction of mortality and guide intervention decisions.

Conclusions:

• Frailty assessments and monitoring body weight/temperature are effective for assessing aging rodents.
• These methods aid in timely interventions, including preemptive euthanasia.
• Improved monitoring benefits research integrity and reduces animal suffering.