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Association between increased serum interleukin-6 levels and sustained attention deficits in patients with major depressive disorder

  • Gang Ye (a1), Guang Zhong Yin (a1), Zhen Tang (a1), Jia Lin Fu (a1), Jie Chen (a1) (a2), Shan Shan Chen (a2), Jia Li (a1), Tian Fu (a1), Xin Yu (a2) (a3), Dong Wu Xu (a2), Jeffrey K. Yao (a4) (a5) and Li Hui (a1)...
Abstract
Background

The pathophysiology of cognitive impairment in patients with the major depressive disorder (MDD) may involve neuroinflammation mediated by cytokines.

Objective

The aim of this study was to examine the serum interleukin-6 (IL-6) levels, sustained attention, and their association in patients with MDD.

Methods

Thirty patients with MDD and 30 healthy controls were enrolled in this case-control study. Sustained attention was measured using the Rapid Visual Information Processing (RVP) task in the Cambridge Neuropsychological Tests Automated Battery. The serum IL-6 levels of all subjects were assessed by sandwich enzyme-linked immunosorbent assays.

Results

There were significant differences in the log10RVP total hits, log10RVP total misses, and log10RVP mean latency between patients with MDD and healthy controls (F = 6.04, p = 0.017; F = 19.77, p < 0.0001; F = 14.42, p < 0.0001, respectively). The serum levels of Log10IL-6 were significantly higher in patients with MDD than in healthy controls (F = 192.27, p < 0.0001). The log10IL-6 levels were also positively correlated with the log10RVP mean latency in patients with MDD (r = 0.45, p = 0.013). A further stepwise multivariate regression analysis indicated that the log10IL-6 levels were significantly associated with the log10RVP mean latency in patients with MDD (β = 0.31, t = 2.41, p = 0.025).

Conclusions

Our data suggested that increased IL-6 levels were associated with the psychopathology of MDD, and that abnormal IL-6 levels were implicated in the impairment of sustained attention in patients with MDD.

Copyright
Corresponding author
Author for correspondence: Li Hui, E-mail: huili004100@126.com
Footnotes
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Gang Ye, Guang Zhong Yin and Zhen Tang contributed equally to this work, and they should be regarded as joint first authors

Footnotes
References
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