Unipolar depressed inpatients without comorbid personality disorder exhibit elevated IL-6 levels at admission and a...

Area of Science:

• Neuroscience
• Immunology
• Psychiatry

Background:

• Unipolar depression (UD) affects many patients, with one-third not achieving remission.
• Inflammation is increasingly implicated in UD pathogenesis.
• No prior studies have compared cytokine levels in UD patients with and without comorbid personality disorders (PD).

Purpose of the Study:

• To compare cytokine levels (IFN-γ, TNF-α, IL-2, IL-4, IL-6, IL-10, and IL-17) among inpatients with UD, UD with comorbid PD, and healthy controls (HC).

Main Methods:

• A longitudinal study involving three groups: UD (n=53), UD+PD (n=31), and HC (n=100).
• Cytokine levels were measured at admission and discharge.
• Statistical analyses included one-way ANOVA, Bonferroni post hoc tests, and multiple linear regressions.

Main Results:

• At admission, IL-6 and IL-17 were elevated in both UD and UD+PD groups versus HC. IL-10 was higher in the UD group versus HC.
• IL-6 levels were higher in the UD group compared to the UD+PD group at admission.
• At discharge, IL-6 and IL-17 remained elevated in both clinical groups versus HC. IL-6 levels decreased in the UD group by discharge.

Conclusions:

• Both UD and UD+PD groups exhibited elevated cytokine levels compared to HC.
• UD patients without PD showed higher IL-6 levels at admission than those with PD.
• Findings suggest potential for biologically based treatments targeting inflammation in UD management.