Contagion of depression: a double-edged sword

Area of Science:

• Neuroscience
• Behavioral Science
• Psychiatry

Background:

• Depression is a major mental health concern with significant economic impact.
• Emerging evidence suggests depression may be contagious, but the underlying mechanisms are not well understood.
• The role of social buffering in depression contagion requires further investigation.

Purpose of the Study:

• To investigate the mechanisms of depression contagion in rodent models.
• To differentiate depression contagion from stress transmission.
• To explore the influence of social buffering on depression contagion.

Main Methods:

• Utilized three rodent models: stress crossover, cohabitation-induced depression contagion, and non-contact induced depression contagion.
• Assessed behavioral changes and corticosterone levels in naive mice exposed to depressed or stressed mice.
• Analyzed the impact of bedding from depressed mice on naive mice's behavior.

Main Results:

• Naive mice cohabiting with depressed mice exhibited increased corticosterone levels and depressive behaviors.
• Mice cohabiting with stressed mice did not show these changes and even showed reduced desperation.
• Exposure to bedding from depressed mice decreased sucrose preference in naive mice, indicating non-contact transmission.
• Depression contagion was observed to be independent of stress transmission.

Conclusions:

• Established reliable rodent models for studying depression contagion.
• Demonstrated that depression contagion can occur independently of stress transmission.
• Highlighted the complex interplay between depression contagion and social buffering, varying with context.
• Provided novel insights into depression contagion mechanisms and potential prevention strategies.