| Summary: | Reiji Yoshimura,1,* Taro Kishi,2,* Nakao Iwata2 1Department of Psychiatry, University of Occupational and Environmental Health, Kitakyushu, Fukuoka 8078555, Japan; 2Department of Psychiatry, Fujita Medical University, Toyoake Aichi 4701192, Japan*These authors contributed equally to this workCorrespondence: Reiji YoshimuraDepartment of Psychiatry, University of Occupational and Environmental Health, Kitakyushu Fukuoka 8078555, JapanTell +81936917253Email yoshi621@med.uoeh-u.ac.jpObjective: IL-6 and catecholamines play roles in the pathophysiology of major depressive disorder (MDD).Aim: The present study investigated associations between plasma IL-6 and plasma catecholamine metabolites in patients with MDD.Participants and methods: A total of 148 patients (male/female 65/83, age 49.5±12.1 years) who met the criteria for MDD based on the Diagnostic and Statistical Manual of Mental Disorders IV and 40 participants as healthy controls (HC; male/female 23/17, age 44.0±10.5 years) were enrolled in the present study. Plasma levels of 3-methoxy-4-hydroxyphenylglycol (MHPG) and homovanillic acid (HVA) were analyzed using high-performance liquid chromatography, and plasma IL-6 levels were measured using ELISA.Results: No correlations were observed among plasma IL-6 levels, MHPG levels, and HVA levels in patients with MDD. Plasma IL-6 levels in patients with MDD were significantly higher than in the HC. A positive correlation was found between plasma IL-6 levels and Hamilton Rating Scale for Depression-17 scores.Conclusion: No correlations existed between plasma IL-6 levels and plasma catecholamine metabolite levels in patients with MDD, and the severity of depressive state was related to plasma IL-6 levels in MDD.Keywords: IL-6, 3-methoxy-4-hydroxyphenylglycol, homovanillic acid, major depressive disorder, Hamilton Rating Scale for Depression
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