Metformin inhibits expression of the proinflammatory biomarker inducible nitric oxide synthase in hepatocytes

Authors

  • Richi Nakatake Department of Surgery, Kansai Medical University
  • Hiroya Iida
  • Morihiko Ishizaki
  • Kosuke Matsui
  • Yusuke Nakamura
  • Masaki Kaibori
  • Mikio Nishizawa
  • Tadayoshi Okumura

DOI:

https://doi.org/10.31989/ffhd.v8i3.423

Abstract

Background: Metformin is used to treat patients with type II diabetes. However, there are few scientific reports on its anti-inflammatory effects. In the inflamed liver, proinflammatory cytokines stimulate liver cells, followed by inducible nitric oxide synthase (iNOS) expression. Excessive NO levels produced by iNOS have been implicated as a factor in liver injury. As a result, it is essential to inhibit iNOS induction to prevent liver injury.

Objective: This study aimed to investigate liver protective effects of metformin by examining interleukin (IL)-1β-stimulated hepatocytes. 

Methods: Primary cultured rat hepatocytes were treated with interleukin (IL)-1β in the presence or absence of metformin. iNOS induction and its signaling pathway were analyzed.

Results: Metformin decreased iNOS protein and mRNA expression, resulting in the inhibition of hepatic NO production. Metformin also reduced tumor necrosis factor (TNF)-α and IL-6 mRNA expression. Metformin inhibited an essential signaling pathway for iNOS induction, type I IL-1 receptor upregulation. Transfection experiments revealed that metformin reduced iNOS mRNA levels through both promoter transactivation and mRNA stabilization. Delayed metformin administration after IL-1β addition also inhibited iNOS induction. 

Conclusions: Metformin affects the induction of inflammatory mediators including iNOS and TNF-α, demonstrating its therapeutic potential for organ injuries, including the liver.

Keywords: metformin, inducible nitric oxide synthase, liver injury, primary cultured hepatocytes, type I interleukin-1 receptor, tumor necrosis factor-α 

Published

2018-03-31

Issue

Section

Research Articles