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NIM811 downregulates transforming growth factor‑β signal transduction in vivo and in vitro

Jing Chen1, Dian-Gang Liu2, Hui Wang1

  • 1Liver Research Center, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, P.R. China.

Molecular Medicine Reports
|November 18, 2015
PubMed

Insights

N‑methyl‑4‑isoleucine cyclosporine (NIM811) reduces liver fibrosis by inhibiting transforming growth factor (TGF)‑β signaling. This compound downregulates key fibrotic markers and downstream signaling molecules, offering potential therapeutic benefits for liver disease.

Area of Science:

  • Hepatology and Gastroenterology
  • Molecular Biology and Biochemistry
  • Pharmacology and Drug Discovery

Background:

  • Liver fibrosis, a precursor to cirrhosis and hepatocellular carcinoma (HCC), is a common outcome of chronic liver diseases.
  • Transforming growth factor (TGF)-β signaling is a critical pathway implicated in the pathogenesis of liver fibrosis.
  • N‑methyl‑4‑isoleucine cyclosporine (NIM811) has shown promise in attenuating liver fibrosis and inflammation.

Purpose of the Study:

  • To investigate the mechanism by which NIM811 downregulates transforming growth factor (TGF)-β signaling in a rat model of CCl4-induced liver fibrosis.
  • To examine the effects of NIM811 on TGF-β signaling pathway components in both in vivo liver tissues and in vitro HSC-T6 cells.

Main Methods:

  • Utilized a carbon tetrachloride (CCl4)-induced liver fibrosis rat model and cultured HSC-T6 cells.
  • Administered NIM811 to rats and HSC-T6 cells, assessing the expression of fibrotic markers (collagen I, α-SMA) and TGF-β signaling molecules (TGF-β1, TβR-I, Smad proteins).
  • Employed reverse transcription-quantitative polymerase chain reaction (RT-qPCR), western blotting, and ELISA for molecular and protein analysis.

Main Results:

  • NIM811 significantly inhibited the expression of collagen I, α-SMA, TGF-β1, and TβR-I in the livers of CCl4-treated rats.
  • NIM811 treatment decreased the phosphorylation of Smad2, 3, and 1/5/8, while increasing Smad7 expression in both rat livers and HSC-T6 cells.
  • NIM811 demonstrated inhibitory effects on collagen I, TGF-β1, and TβR-I expression in HSC-T6 cells, confirming its antifibrotic action.

Conclusions:

  • The antifibrotic effects of NIM811 are attributed to its ability to inhibit the TGF-β1 signaling pathway.
  • NIM811 effectively downregulates key fibrotic markers and downstream signaling molecules involved in liver fibrosis.
  • These findings suggest NIM811 as a potential therapeutic agent for managing liver fibrosis.

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