Chronic high dose of captopril induces depressive-like behaviors in mice: possible mechanism of regulatory T cell in depression

Oncotarget
Hyun-Sun ParkMin-Soo Kwon

Abstract

Major depression has various types of symptoms and disease courses with inconsistent response to monoamine-related antidepressants. Thus, monoamine theory may not be the only pathophysiologic pathway relevant to depression. Recently, it has been suggested that regulatory T cell (Treg) is associated with depression. Based on our previous study that showed decreased regulatory T cell (Treg) population following chronic high-dose captopril (CHC, 40 mg/kg/day * 21 days) administration, we examined whether CHC alone can induce depressive-like behaviors in mice even without stressful stimuli. In this study, we found that CHC induced depressive-like behaviors in tail suspension test (TST) and forced swimming test (FST) without systemic illness, while it did not induce anhedonic behavior, anxiety-like behaviors, or sociality-related behavior. The depressive-like behaviors were rescued by either CHC washout or antidepressant. CHC caused reduction in foxp3 and gata3 mRNA expression in the lymph nodes with elevation in plasma IL-1β and IL-6. Interestingly, CHC increased serum angiotensin II level. In the hippocampus, CHC increased TNF-α and IL-6 mRNA expression with microglia activation while reduced glucocorticoid receptor expression. Ho...Continue Reading

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Methods Mentioned

BETA
flow cytometry
PCR
protein assay
electrophoresis

Software Mentioned

EthoVision
ImageJ
Image J
FlowJo
GraphPad Prism
EthoVision®
EthoVision XT9

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