Damaged Insula Network Contributes to Depression in Parkinson's Disease

Area of Science:

• Neuroscience
• Neurology
• Psychiatry

Background:

• Depression is a common comorbidity in Parkinson's disease (PD).
• Previous research indicates structural changes in the insula of depressed PD patients.
• The functional impact of these structural alterations on insula networks and depression remains unclear.

Purpose of the Study:

• To investigate functional connectivity alterations in the insula of patients with Parkinson's disease.
• To determine if disrupted insula functional networks contribute to depression in PD.

Main Methods:

• Recruited 17 depressed PD patients, 17 non-depressed PD patients, and 17 healthy controls.
• Conducted neurological and psychiatric assessments.
• Utilized resting-state functional magnetic resonance imaging (fMRI) with seed-based insula functional analyses.

Main Results:

• PD patients showed significantly decreased insula functional connectivity globally compared to controls.
• Depressed PD patients exhibited further reduced connectivity in the middle frontal gyrus and inferior parietal lobe.
• Left anterior insula to middle frontal gyrus connectivity positively correlated with cognitive scores.

Conclusions:

• Insula networks are significantly impaired in Parkinson's disease patients.
• Disrupted connectivity between salience and executive control networks may underlie depression in PD.
• Findings highlight the role of insula network dysfunction in PD-related depression.