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Long maternal separation has protective effects in rats exposed to activity-based anorexia
O Carrera1, M Cerrato, A Sanchez
1Complexo Hospitalario Universitario, Santiago de Compostela, Spain.
Insights
Prolonged maternal separation in infancy increased survival rates in female rats facing activity-based anorexia (ABA). This neonatal stressor appears to build resilience in females against life-threatening conditions.
Area of Science:
- Neuroscience
- Animal Behavior
- Endocrinology
Background:
- Neonatal stress, such as maternal separation, can have long-lasting effects on behavior and physiology.
- Activity-based anorexia (ABA) is a model of disordered eating characterized by food restriction and excessive exercise.
Purpose of the Study:
- To investigate the impact of different durations of neonatal maternal separation on the survival of young adult rats subjected to activity-based anorexia (ABA).
Main Methods:
- Rat pups were exposed to brief maternal separation (BMS), long maternal separation (LMS), or no handling (NH) during the first 20 postnatal days.
- Both male and female rats were subsequently exposed to the ABA protocol, involving food restriction and access to an activity wheel.
Main Results:
- Neonatal maternal separation did not significantly affect the survival time of male rats under ABA conditions.
- Female rats that underwent long maternal separation (LMS) exhibited significantly greater survival rates compared to non-handled (NH) females when exposed to ABA.
Conclusions:
- Prolonged maternal separation during infancy may confer resilience in female rodents exposed to severe, life-threatening conditions like activity-based anorexia.
- These findings suggest sex-specific effects of early life stress on coping mechanisms in the context of an eating disorder model.
Abstract:
This study examined the effect of three neonatal treatments of maternal separation during infancy in young adult rats exposed to standard activity-based anorexia (ABA) consisting of food restriction plus free access to an activity wheel. During the first 20 postnatal days of life rat pups were exposed to periods of either brief maternal separation (BMS, 15 min), long maternal separation (LMS, 180 min), or were non-handled (NH). Thereafter, male and female rats were exposed to ABA. Neonatal treatment produced no significant differences in the survival time of male rats, whereas survival was greater in female rats exposed to LMS than in NH rats under ABA procedure. In conclusion, prolonged maternal separation appears to promote resistance in female animals subjected to harsh ABA life-threatening conditions.
