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Vitamin K2 downregulates the expression of fibroblast growth factor receptor 3 in human hepatocellular carcinoma

Ke Cao1, Weidong Liu, Hideji Nakamura

  • 1Division of Hepatobiliary and Pancreatic Medicine, Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan.

Hepatology Research : the Official Journal of the Japan Society of Hepatology
|July 24, 2009
PubMed
Abstract

Insights

Vitamin K2 inhibits hepatocellular carcinoma (HCC) cell growth by downregulating fibroblast growth factor receptor 3 (FGFR3) expression. This study identifies FGFR3 as a key molecular target for vitamin K2

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Hepatocellular carcinoma (HCC) is a significant global health concern.
  • Vitamin K2 demonstrates antitumor properties, but its precise inhibitory mechanisms in HCC remain unclear.
  • Fibroblast growth factor receptor 3 (FGFR3) is implicated in various cancers.

Purpose of the Study:

  • To identify the molecular targets of vitamin K2 in HCC.
  • To investigate the effect of vitamin K2 on FGFR3 expression and its signaling pathway in HCC cells.

Main Methods:

  • DNA chip analysis to assess gene expression changes.
  • RT-PCR and real-time PCR to quantify FGFR3 mRNA levels.
  • Western blot analysis for FGFR3 protein expression.
  • Dual-luciferase assay to evaluate FGFR3 promoter activity.

Main Results:

  • Vitamin K2 significantly downregulated FGFR3 gene expression (60.6%) and mRNA levels (61.5%) in HuH-7 HCC cells.
  • Vitamin K2 suppressed FGFR3 protein expression and promoter activity in a dose-dependent manner.
  • The FGFR3-ERK1/2 signaling pathway was inhibited by vitamin K2 treatment.

Conclusions:

  • Vitamin K2 suppresses HCC cell proliferation by downregulating FGFR3 expression.
  • Transcriptional suppression of FGFR3 represents a novel mechanism for vitamin K2's action in HCC.

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