Prefrontal-amygdala emotion regulation and depression in multiple sclerosis

Area of Science:

• Neuroscience
• Psychiatry
• Neurology

Background:

• Depression is a common comorbidity in multiple sclerosis (MS).
• Neural mechanisms of emotion regulation, particularly involving the amygdala and prefrontal cortex, are key in depression but underexplored in MS.
• Understanding these mechanisms is crucial for managing psychosocial consequences in MS patients.

Purpose of the Study:

• To investigate neural emotion regulation in individuals with multiple sclerosis and depression.
• To examine the impact of depression and its interaction with lesions in amygdala-prefrontal tracts on brain activity.
• To compare emotion regulation in MS patients with and without depression.

Main Methods:

• Cross-sectional observational study using functional MRI.
• Assessed neural emotion regulation via a task contrasting negative stimulus perception (regulated vs. unregulated).
• Analyzed 16 individuals with MS and depression and 26 individuals with MS without depression, considering covariates like lesion load and sex.

Main Results:

• Patients with depression showed impaired behavioral downregulation of negative emotions.
• Reduced activity in the left amygdala during emotion regulation was observed in depressed MS patients.
• An interaction between depression and lesions in amygdala-prefrontal tracts affected amygdala activity, suggesting a link between MS pathology and emotional processing deficits.

Conclusions:

• Depression in multiple sclerosis is characterized by impaired neurobehavioral emotion regulation, aligning with cognitive depression theories.
• Lesion load within amygdala-prefrontal tracts significantly modulates the relationship between neural emotion regulation and depression in MS.
• These findings highlight the complex interplay between MS pathology and emotional dysfunction, offering insights for targeted interventions.