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Sex differences in behavioral despair: relationships between behavioral despair and open field activity.
S J Alonso1, M A Castellano, D Afonso
1Department of Physiology, Faculty of Medicine, University of La Laguna, Tenerife, Canary Islands, Spain.
Physiology & Behavior
|January 1, 1991
Summary
Male animals show higher immobility in depression models, indicating sex differences in depression. These findings were consistent across two validated animal models of depression.
Area of Science:
- Neuroscience
- Behavioral Science
- Psychiatry
Background:
- Human depression rates exhibit significant sex differences, but the underlying biological mechanisms remain unclear.
- Experimental challenges have hindered a precise understanding of the nature of these sexual dimorphisms in depression.
Purpose of the Study:
- To quantify sex differences in depression using established animal models.
- To investigate the validity and correlation between two distinct animal models of depression.
Main Methods:
- Utilized the Porsolt et al. forced swimming test in rodents.
- Employed the Hilakivi and Hilakivi forced swimming test in rodents.
- Assessed immobility duration as a primary measure of depressive-like behavior.
Main Results:
- Both animal models demonstrated significantly higher immobility durations in males compared to females.
- No significant correlation was found between general activity levels and immobility in either test, suggesting sex differences are not solely activity-dependent.
- A significant positive correlation was observed between the results of the two distinct depression models.
Conclusions:
- Animal models consistently reveal sex differences in depression, with males exhibiting greater immobility.
- These findings suggest that sex differences in depression are robust and potentially independent of general locomotor activity.
- The correlation between the two models supports their utility in studying the neurobiology of depression and its sex-related aspects.