Dexmedetomidine reduces lipopolysaccharide induced neuroinflammation, sickness behavior, and anhedonia

Ching Hua Yeh, Liang Po Hsieh, Ming Chung Lin, Tsui Shan Wei, Hui Ching Lin, Chia Cheng Chang, Chung Hsi Hsing

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


Background Peripheral innate immune response may induce sickness behavior through activating microglia, excessive cytokines production, and neuroinflammation. Dexmedetomidine (Dex) has anti-inflammatory effect. We investigated the effects of Dex on lipopolysaccharide (LPS)induced neuroinflammation and sickness behavior in mice. Materials and methods BALB/c mice were intraperitoneally (i.p.) injected with Dex (50 ug/kg) or vehicle. One hour later, the mice were injected (i.p.) with Escherichia coli LPS (0.33 mg/kg) or saline (n = 6 in each group). We analyzed the food and water intake, body weight loss, and sucrose preference of the mice for 24h. We also determined microglia activation and cytokines expression in the brains of the mice. In vitro, we determine cytokines expression in LPS-treated BV-2 microglial cells with or without Dex treatment. Results In the Dex-pretreated mice, LPS-induced sickness behavior (anorexia, weight loss, and social withdrawal) were attenuated and microglial activation was lower than vehicle control. The mRNA expression of TNF-α, MCP-1, indoleamine 2, 3 dioxygenase (IDO), caspase-3, and iNOS were increased in the brain of LPS-challenged mice, which were reduced by Dex but not vehicle. Conclusion Dexmedetomidine diminished LPS-induced neuroinflammation in the mouse brain and modulated the cytokine-associated changes in sickness behavior.

Original languageEnglish
Article numbere0191070
JournalPLoS ONE
Issue number1
Publication statusPublished - Jan 2018
Externally publishedYes

ASJC Scopus subject areas

  • General
  • General Biochemistry,Genetics and Molecular Biology
  • General Agricultural and Biological Sciences


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