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LPS stimulates MUC5AC expression in human biliary epithelial cells: whether there exists a possible pathway of

Min Li1, Yu Tian, Shuodong Wu

  • 1Biliary & Vascular Surgery, Shengjing Hospital of China Medical University, Shenyang, 110004, People's Republic of China.

Molecular and Cellular Biochemistry
|September 26, 2013
PubMed

Insights

Lipopolysaccharide (LPS) increases MUC5AC, a key mucus component, in human biliary cells. This process involves reactive oxygen species (ROS), regulated by PKC and NADPH oxidase, clarifying bacterial infection

Area of Science:

  • Biliary tract pathophysiology
  • Mucus hypersecretion mechanisms
  • Cellular signaling pathways

Background:

  • Lipopolysaccharide (LPS) is known to upregulate MUC5AC in airway cells.
  • The link between bacterial infection and mucus changes in the biliary tract is not well understood.

Purpose of the Study:

  • To investigate the mechanism of MUC5AC regulation by LPS in human biliary epithelial cells.
  • To determine the role of reactive oxygen species (ROS) in LPS-induced MUC5AC production.

Main Methods:

  • Human biliary epithelial cells were treated with LPS.
  • Hydrogen peroxide (H2O2) production was measured.
  • MUC5AC expression was analyzed using real-time PCR, Western blot, and immunohistochemistry.
  • Specific inhibitors were used to block signaling pathways.

Main Results:

  • LPS treatment dose-dependently increased H2O2 production.
  • LPS significantly upregulated MUC5AC at both mRNA and protein levels.
  • Inhibitors targeting specific pathways reduced LPS-induced MUC5AC expression.
  • Reactive oxygen species (ROS) were found to mediate LPS-induced MUC5AC secretion.

Conclusions:

  • Reactive oxygen species (ROS) play a crucial role in LPS-induced MUC5AC upregulation in biliary epithelial cells.
  • Protein kinase C (PKC) and NADPH oxidase are key regulators of MUC5AC production in response to LPS.
  • This study elucidates a novel mechanism for altered mucus secretion in the biliary tract during bacterial challenges.

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