Ephedrae herba stimulates hepatocyte growth factor-induced MET endocytosis and downregulation via early/late endocytic pathways in gefitinib-resistant human lung cancer cells

Yukio Nishimura, Sumiko Hyuga, Soichi Takiguchi, Masashi Hyuga, Kazuyuki Itoh, Toshihiko Hanawa

研究成果: ジャーナルへの寄稿記事

3 引用 (Scopus)

抄録

The MET tyrosine kinase receptor and its ligand, hepatocyte growth factor (HGF), are known to be overexpressed in a variety of malignant tumor cells, and are implicated in the development of gefitinib-resistance in human non-small cell lung cancer (NSCLC) cells. Ephedrae herba was previously reported to prevent HGF-induced cancer cell motility by directly suppressing HGF/MET signaling through the inhibition of MET tyrosine kinase, and treatment with its extract also considerably reduced MET protein levels. To further investigate the mechanism underlying the Ephedrae herba-induced inhibition of MET phosphorylation as well as its degradation and subsequent disappearance, we examined the effect of Ephedrae herba on HGF-stimulated MET endocytosis and downregulation via early/late endocytic pathways in an NSCLC cell line. Using immunofluorescence microscopy, we found that pretreatment of cells with Ephedrae herba extract dramatically changed the intracellular distribution of plasma membrane-associated MET, and that the resultant MET staining was distributed throughout the cytoplasm. Pretreatment of the cells with Ephedrae herba extract also led to the rapid loss of MET and phosphorylated (p)-MET in HGF-stimulated cells. In contrast, inefficient endocytic delivery of MET and p-MET from early to late endosomes was observed in the absence of Ephedrae herba extract, since considerable amounts of the internalized MET accumulated in the early endosomes and were not delivered to lysosomes up to 1 h after HGF-stimulation. Furthermore, large amounts of MET and p-MET that had accumulated in late endosomes of Ephedrae herba-pretreated cells after HGF stimulation were observed along with bafilomycin A1. Therefore, we inferred that degradation of MET occurred in the late endosome/ lysosome pathway. Moreover, western blot analysis revealed the accelerated degradation of MET and p-MET proceeds in cells pretreated with Ephedrae herba extract. Collectively, our results suggest that some components of Ephedrae herba have a novel role in promoting HGF-stimulated MET and p-MET endocytosis followed by its downregulation, likely mediated by the early/late endocytic pathways.

元の言語英語
ページ(範囲)1895-1906
ページ数12
ジャーナルInternational journal of oncology
48
発行部数5
DOI
出版物ステータス出版済み - 5 2016

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Hepatocyte Growth Factor
Endocytosis
Lung Neoplasms
Down-Regulation
Endosomes
Lysosomes
Non-Small Cell Lung Carcinoma
Proto-Oncogene Proteins c-met
gefitinib
Fluorescence Microscopy
Protein-Tyrosine Kinases
Cell Movement
Neoplasms
Cytoplasm
Western Blotting
Phosphorylation
Cell Membrane
Staining and Labeling
Ligands
Cell Line

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research

これを引用

Ephedrae herba stimulates hepatocyte growth factor-induced MET endocytosis and downregulation via early/late endocytic pathways in gefitinib-resistant human lung cancer cells. / Nishimura, Yukio; Hyuga, Sumiko; Takiguchi, Soichi; Hyuga, Masashi; Itoh, Kazuyuki; Hanawa, Toshihiko.

:: International journal of oncology, 巻 48, 番号 5, 05.2016, p. 1895-1906.

研究成果: ジャーナルへの寄稿記事

Nishimura, Yukio ; Hyuga, Sumiko ; Takiguchi, Soichi ; Hyuga, Masashi ; Itoh, Kazuyuki ; Hanawa, Toshihiko. / Ephedrae herba stimulates hepatocyte growth factor-induced MET endocytosis and downregulation via early/late endocytic pathways in gefitinib-resistant human lung cancer cells. :: International journal of oncology. 2016 ; 巻 48, 番号 5. pp. 1895-1906.
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abstract = "The MET tyrosine kinase receptor and its ligand, hepatocyte growth factor (HGF), are known to be overexpressed in a variety of malignant tumor cells, and are implicated in the development of gefitinib-resistance in human non-small cell lung cancer (NSCLC) cells. Ephedrae herba was previously reported to prevent HGF-induced cancer cell motility by directly suppressing HGF/MET signaling through the inhibition of MET tyrosine kinase, and treatment with its extract also considerably reduced MET protein levels. To further investigate the mechanism underlying the Ephedrae herba-induced inhibition of MET phosphorylation as well as its degradation and subsequent disappearance, we examined the effect of Ephedrae herba on HGF-stimulated MET endocytosis and downregulation via early/late endocytic pathways in an NSCLC cell line. Using immunofluorescence microscopy, we found that pretreatment of cells with Ephedrae herba extract dramatically changed the intracellular distribution of plasma membrane-associated MET, and that the resultant MET staining was distributed throughout the cytoplasm. Pretreatment of the cells with Ephedrae herba extract also led to the rapid loss of MET and phosphorylated (p)-MET in HGF-stimulated cells. In contrast, inefficient endocytic delivery of MET and p-MET from early to late endosomes was observed in the absence of Ephedrae herba extract, since considerable amounts of the internalized MET accumulated in the early endosomes and were not delivered to lysosomes up to 1 h after HGF-stimulation. Furthermore, large amounts of MET and p-MET that had accumulated in late endosomes of Ephedrae herba-pretreated cells after HGF stimulation were observed along with bafilomycin A1. Therefore, we inferred that degradation of MET occurred in the late endosome/ lysosome pathway. Moreover, western blot analysis revealed the accelerated degradation of MET and p-MET proceeds in cells pretreated with Ephedrae herba extract. Collectively, our results suggest that some components of Ephedrae herba have a novel role in promoting HGF-stimulated MET and p-MET endocytosis followed by its downregulation, likely mediated by the early/late endocytic pathways.",
author = "Yukio Nishimura and Sumiko Hyuga and Soichi Takiguchi and Masashi Hyuga and Kazuyuki Itoh and Toshihiko Hanawa",
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AU - Nishimura, Yukio

AU - Hyuga, Sumiko

AU - Takiguchi, Soichi

AU - Hyuga, Masashi

AU - Itoh, Kazuyuki

AU - Hanawa, Toshihiko

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