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Hippocampal CLOCK protein participates in the persistence of depressive-like behavior induced by chronic unpredictable stress

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Abstract

Rationale

Circadian disturbances are strongly linked with major depression. The circadian proteins CLOCK and BMAL1 are abundantly expressed but function differently in the suprachiasmatic nucleus (SCN) and hippocampus. However, their roles in depressive-like behavior are still poorly understood.

Objectives

To investigate the alterations of CLOCK and BMAL1 in the SCN and hippocampus in rats subjected to chronic unpredictable stress (CUS) and to explore the relationship of circadian protein and the depressive-like behavior.

Results

Together with depressive-like behavior induced by CUS, CLOCK and BMAL1 in the SC were inhibited during the light period, and the peak expression of CLOCK in the hippocampus was shifted from the dark to light period. BMAL1 expression in the hippocampus was not significantly changed. Two weeks after the termination of CUS, abnormalities of CLOCK in the CA1 and CA3 endured, with unchanged depressive-like behavior, but the expression of CLOCK and BMAL1 in the SCN recovered to control levels. Knockdown of the Clock gene in CA1 induced depressive-like behavior in normal rats. CLOCK in the SCN and hippocampus may participate in the development of depressive-like behavior. However, CLOCK in the hippocampus but not SCN was involved in the long-lasting effects of CUS on depressive-like behavior. BMAL1 in the hippocampus appeared to be unrelated to the effects of CUS on depressive-like behavior.

Conclusion

CLOCK protein in the hippocampus but not SCN play an important role in the long-lasting depressive-like behavior induced by CUS. These findings suggest a novel therapeutic target in the development of new antidepressants focusing on the regulation of circadian rhythm.

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Acknowledgments

This work was supported in part by a grant from the National Natural Science Foundation of China (no. 30800362). The authors declare that they do not have any conflicts of interest related to the data presented in this manuscript.

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Authors and Affiliations

  1. National Institute on Drug Dependence, Peking University, 38, Xue Yuan Road, Beijing, 100191, China

    Wen-Gao Jiang, Su-Xia Li, Jian-Feng Liu, Yan Sun, Shuang-Jiang Zhou, Wei-Li Zhu, Jie Shi & Lin Lu

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  1. Wen-Gao Jiang
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  2. Su-Xia Li
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  3. Jian-Feng Liu
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Correspondence to Wei-Li Zhu or Lin Lu.

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Jiang, WG., Li, SX., Liu, JF. et al. Hippocampal CLOCK protein participates in the persistence of depressive-like behavior induced by chronic unpredictable stress. Psychopharmacology 227, 79–92 (2013). https://doi.org/10.1007/s00213-012-2941-4

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  • DOI: https://doi.org/10.1007/s00213-012-2941-4

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