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Bile duct ligation increased dopamine levels in the cerebral cortex of rats partly due to induction of tyrosine hydroxylase
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  • Weimin kong,
  • Xueying Sun,
  • Siyu Yu,
  • Peihua Liu,
  • Xiaoke zheng,
  • Jiaxin Zhang,
  • Liang Zhu,
  • Tianxin Jiang,
  • Mengmeng Jin,
  • Jinghui Gao,
  • XiaoDong Liu,
  • Li Liu
Weimin kong
China Pharmaceutical University
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Xueying Sun
China Pharmaceutical University
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Siyu Yu
China Pharmaceutical University
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Peihua Liu
China Pharmaceutical University
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Xiaoke zheng
China Pharmaceutical University
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Jiaxin Zhang
China Pharmaceutical University
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Liang Zhu
China Pharmaceutical University
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Tianxin Jiang
China Pharmaceutical University
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Mengmeng Jin
China Pharmaceutical University
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Jinghui Gao
China Pharmaceutical University
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XiaoDong Liu
China Pharmaceutical University
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Li Liu
China Pharmaceutical University
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Abstract

Background and Purpose Liver failure is often associated with psychiatric alterations, partly resulting from the increased dopamine levels in brain. We aimed to investigate relationship between increased dopamine levels and mental abnormalities using bile duct ligation (BDL) rats and document mechanism that liver failure increased dopamine levels in SH-SY5Y cells. Experimental Approach Psychiatric alterations were operated following 14-day BDL. Dopamine and its metabolite levels in cortex, expressions of enzymes and transporters related to dopamine metabolism and transport in cortex and hippocampus were measured. SH-SY5Y cells were used to investigate whether NH4Cl, bile acids and bilirubin affected expression of tyrosine hydroxylase (TH) or not. TH expression in SH-SY5Y cells co-incubated with bilirubin and signal pathway inhibitors was measured. Key Results Open-field test results showed a remarkable increase in exploratory behavior following BDL. BDL increased dopamine levels and expression of TH protein in cortex. MAO-A and Mb-COMT slightly but significantly decreased. Data from SH-SY5Y cells showed that increased bilirubin levels was a factor in inducing TH expression. Both inhibitor of NF-κB pathway BAY117082 and silencing p65 remarkably reversed bilirubin-induced upregulation of TH protein. NF-κB activator TNF-α increased expression of TH protein. Roles of bilirubin in TH expression and increases in dopamine levels were documented using hyperbilirubinemia rats. Significant increases in dopamine levels, expressions of TH, p65 and p-p65 protein were observed in hyperbilirubinemia rats. Conclusion and Implications BDL significantly increased dopamine levels in rat cortex partly due to bilirubin-mediated TH induction. Increased bilirubin induced TH expression via activating NF-κB signaling pathway.

Peer review status:UNDER REVIEW

19 Feb 2021Submitted to British Journal of Pharmacology
22 Feb 2021Assigned to Editor
22 Feb 2021Submission Checks Completed
13 Mar 2021Reviewer(s) Assigned