CSF miR-16 is decreased in major depression patients and its neutralization in rats induces depression-like behaviors via a serotonin transmitter system

Journal of Affective Disorders
Ming-Fen SongYa-Ying Lv

Abstract

Animal and cell line studies demonstrated that miR-16 may be associated with major depressive disorder (MDD) via regulation of the expression of serotonin transporter (SERT) gene. However, human studies about miR-16 of patients with MDD are still lacking. The aim of this study was to investigate the possible involvement of miR-16 in the mechanism of MDD in humans. Thirty-six drug-free patients with MDD and 30 healthy controls aged between 18 and 45 years old were recruited. 24-item Hamilton depression scale test was performed for each subject. MiR-16 in cerebrospinal fluid (CSF) and blood, as well as serotonin in CSF were assayed by the qRT-PCR or ELISA method. To confirm the role of CSF miR-16 in MDD, animal study about intracerebroventricular injection of anti-miR-16 was also performed. Depression-like behaviors, CSF miR-16 and serotonin, blood miR-16, and raphe SERT protein of rats were also tested. CSF miR-16 in MDD patients was significantly lower than that in controls. It was negatively correlated with Hamilton scores and positively associated with CSF serotonin. However, blood miR-16 was not significantly different between two groups and it was not statistically correlated with CSF miR-16. In animal study, anti-miR-16-tr...Continue Reading

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