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Minocycline produced antidepressant-like effects on the learned helplessness rats with alterations in levels of monoamine in the amygdala and no changes in BDNF levels in the hippocampus at baseline.
Pharmacology, Biochemistry, and Behavior 2012 January
Previous studies have indicated that minocycline might function as an antidepressant drug. The aim of this study was to evaluate the antidepressant-like effects of minocycline, which is known to suppress activated microglia, using learned helplessness (LH) rats (an animal model of depression). Infusion of minocycline into the cerebral ventricle of LH rats induced antidepressant-like effects. However, infusion of minocycline into the cerebral ventricle of naïve rats did not produce locomotor activation in the open field tests, suggesting that the antidepressant-like effects of minocycline were not attributed to the enhanced locomotion. LH rats showed significantly higher serotonin turnover in the orbitofrontal cortex and lower levels of brain-derived neurotrophic factor (BDNF) in the hippocampus than control rats. However, these alterations in serotonin turnover and BDNF expression remained unchanged after treatment with minocycline. On the contrary, minocycline treatment of LH rats induced significant increases in the levels of dopamine and its metabolites in the amygdala when compared with untreated LH rats. Taken together, minocycline may be a therapeutic drug for the treatment of depression.
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