CD44 Variant Regulates Redox Status in Cancer Cells by Stabilizing the xCT Subunit of System xc- and Thereby Promotes Tumor Growth

Takatsugu Ishimoto, Osamu Nagano, Toshifumi Yae, Mayumi Tamada, Takeshi Motohara, Hiroko Oshima, Masanobu Oshima, Tatsuya Ikeda, Rika Asaba, Hideki Yagi, Takashi Masuko, Takatsune Shimizu, Tomoki Ishikawa, Kazuharu Kai, Eri Takahashi, Yu Imamura, Yoshifumi Baba, Mitsuyo Ohmura, Makoto Suematsu, Hideo BabaHideyuki Saya

研究成果: Article査読

688 被引用数 (Scopus)

抄録

CD44 is an adhesion molecule expressed in cancer stem-like cells. Here, we show that a CD44 variant (CD44v) interacts with xCT, a glutamate-cystine transporter, and controls the intracellular level of reduced glutathione (GSH). Human gastrointestinal cancer cells with a high level of CD44 expression showed an enhanced capacity for GSH synthesis and defense against reactive oxygen species (ROS). Ablation of CD44 induced loss of xCT from the cell surface and suppressed tumor growth in a transgenic mouse model of gastric cancer. It also induced activation of p38MAPK, a downstream target of ROS, and expression of the gene for the cell cycle inhibitor p21CIP1/WAF1. These findings establish a function for CD44v in regulation of ROS defense and tumor growth.

本文言語English
ページ(範囲)387-400
ページ数14
ジャーナルCancer Cell
19
3
DOI
出版ステータスPublished - 08-03-2011
外部発表はい

All Science Journal Classification (ASJC) codes

  • 腫瘍学
  • 細胞生物学
  • 癌研究

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