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Neurobiol Dis. 2015 Jul;79:59-69. doi: 10.1016/j.nbd.2015.04.004. Epub 2015 Apr 24.

Antidepressant effects of exercise are produced via suppression of hypocretin/orexin and melanin-concentrating hormone in the basolateral amygdala.

Author information

1
Department of Brain and Cognitive Sciences, Ewha Womans University, Seoul, Republic of Korea; Department of Sports Science, Sungkyunkwan University, Suwon, Republic of Korea.
2
Department of Brain and Cognitive Sciences, Ewha Womans University, Seoul, Republic of Korea.
3
Department of Anatomy, Inha University School of Medicine, Inchon, Republic of Korea.
4
Department of Sports Science, Sungkyunkwan University, Suwon, Republic of Korea.
5
Department of Brain and Cognitive Sciences, Ewha Womans University, Seoul, Republic of Korea; Department of Chemistry and Nano Science, Ewha Womans University, Seoul, Republic of Korea; Brain Disease Research Institute, Ewha Womans University, Seoul, Republic of Korea. Electronic address: plhan@ewha.ac.kr.

Abstract

Physical exercise is considered beneficial in the treatment of depression, but the underlying mechanism is not clearly understood. In the present study, we investigated the mechanism regulating antidepressant effects of exercise by focusing on the role of the amygdala using a well-defined animal model of depression. C57BL/6 mice treated with repeated restraint showed depression-like behaviors, which was counteracted by post-stress treatment with physical exercise. The two neuropeptides hypocretin/orexin (Hcrt/Orx) and melanin-concentrating hormone (MCH) were transcriptionally upregulated in the BLA after repeated stress, and their enhanced expression was downregulated by treatment with exercise, mirroring stress-induced depression-like behaviors and their reversal by exercise. Stereotaxic injection of either Hcrt/Orx peptide or MCH peptide within the BLA commonly increased phospho-CaMKIIα level and produced depression-like behaviors, mimicking the neural states in the BLA of mice subjected to repeated stress. In contrast, siRNA-mediated suppression of Hcrt/Orx or MCH in the BLA blocked stress-induced depression-like behaviors. Furthermore, siRNA-mediated inhibition of CaMKIIα in the BLA also counteracted stress-induced depression-like behaviors. Local injection of Hcrt/Orx peptide or MCH peptide within the BLA in exercise-treated animals blocked antidepressant-like effects of exercise. Together these results suggest that exercise produces antidepressant effects via suppression of Hcrt/Orx and MCH neural systems in the BLA.

KEYWORDS:

BLA; Depression; Exercise; Hypocretin/orexin; Melanin-concentrating hormone; Stress

PMID:
25917762
DOI:
10.1016/j.nbd.2015.04.004
[Indexed for MEDLINE]

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