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miR‑146a reduces depressive behavior by inhibiting microglial activation

  • Authors:
    • Chuan-Peng Liu
    • Ming Zhong
    • Jun-Xia Sun
    • Jin He
    • Yong Gao
    • Fang-Xia Qin
  • View Affiliations / Copyright

    Affiliations: Department of Psychiatry, Binzhou People's Hospital, Binzhou, Shandong 256600, P.R. China, Department of Psychiatry, Binzhou Youfu Hospital, Binzhou, Shandong 256600, P.R. China, Department of Psychology, Shandong Provincial Mental Health Center, Jinan, Shandong 250014, P.R. China
    Copyright: © Liu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 463
    |
    Published online on: April 19, 2021
       https://doi.org/10.3892/mmr.2021.12102
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Abstract

Depression is one of the major psychiatric diseases affecting the quality of life for individuals worldwide. Numerous reports have investigated depression, although its etiology remains to be elucidated. microRNA (miR)‑146a is suggested to regulate innate immune and inflammatory responses. However, it is unclear whether miR‑146a is involved in depression. Depression model mice were established using lipopolysaccharide‑induced depression and chronic unpredictable mild stress, separately. miR‑146a mimic and short interfering RNA were used to treat depressed mice. Depression‑like behaviors and levels of pro‑inflammatory cytokines were measured, while ionized calcium binding adapter molecule 1 (Iba‑1) expression in hippocampus was quantified by immunohistochemistry. Neuroinflammatory factor levels in hippocampus were measured by western blotting. BV‑2 cells were used to confirm that miR‑146a suppressed microglia activation. Compared with control mice, the two depressed mouse models showed clearly decreased sucrose preference and significantly increased immobility time in the forced swimming test and tail suspension test (P<0.05). miR‑146a overexpression significantly increased sucrose preference and reduced immobility time in depressed mice (P<0.05). However, total distance traveled in the locomotor activity test did not differ among groups. Compared with controls, expression levels of Iba‑1, inducible nitric oxide, IL‑1β, TNF‑α, interleukin 1 receptor associated kinase 1 (IRAK1), TNF receptor‑associated factor 6 (TRAF6) and phosphorylated NF‑κB p65 were significantly increased in depressed mice (P<0.05). miR‑146a overexpression effectively inhibited expression of these neuroinflammatory proteins, while miR‑146a silencing significantly upregulated their expression (P<0.05). Consistent with these in vivo results, miR‑146a mimic treatment inhibited TNF‑α, IL‑1β, IRAK1 and TRAF6 expression in BV‑2 cells. miR‑146a improved depressive behaviors in depressed model mice by inhibiting microglial activation and neuroinflammatory factor expression.
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Copy and paste a formatted citation
Spandidos Publications style
Liu C, Zhong M, Sun J, He J, Gao Y and Qin F: miR‑146a reduces depressive behavior by inhibiting microglial activation. Mol Med Rep 23: 463, 2021.
APA
Liu, C., Zhong, M., Sun, J., He, J., Gao, Y., & Qin, F. (2021). miR‑146a reduces depressive behavior by inhibiting microglial activation. Molecular Medicine Reports, 23, 463. https://doi.org/10.3892/mmr.2021.12102
MLA
Liu, C., Zhong, M., Sun, J., He, J., Gao, Y., Qin, F."miR‑146a reduces depressive behavior by inhibiting microglial activation". Molecular Medicine Reports 23.6 (2021): 463.
Chicago
Liu, C., Zhong, M., Sun, J., He, J., Gao, Y., Qin, F."miR‑146a reduces depressive behavior by inhibiting microglial activation". Molecular Medicine Reports 23, no. 6 (2021): 463. https://doi.org/10.3892/mmr.2021.12102
Copy and paste a formatted citation
x
Spandidos Publications style
Liu C, Zhong M, Sun J, He J, Gao Y and Qin F: miR‑146a reduces depressive behavior by inhibiting microglial activation. Mol Med Rep 23: 463, 2021.
APA
Liu, C., Zhong, M., Sun, J., He, J., Gao, Y., & Qin, F. (2021). miR‑146a reduces depressive behavior by inhibiting microglial activation. Molecular Medicine Reports, 23, 463. https://doi.org/10.3892/mmr.2021.12102
MLA
Liu, C., Zhong, M., Sun, J., He, J., Gao, Y., Qin, F."miR‑146a reduces depressive behavior by inhibiting microglial activation". Molecular Medicine Reports 23.6 (2021): 463.
Chicago
Liu, C., Zhong, M., Sun, J., He, J., Gao, Y., Qin, F."miR‑146a reduces depressive behavior by inhibiting microglial activation". Molecular Medicine Reports 23, no. 6 (2021): 463. https://doi.org/10.3892/mmr.2021.12102
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