The 4E-BP1/eIF4E ratio is a determinant for rapamycin response in esophageal cancer cells

被引:10
作者
Hsu, Han-Shui [1 ,2 ]
Lin, Ming-Hsien [3 ,4 ]
Jang, Yi-Hua [5 ]
Kuo, Ting-Ting [5 ]
Liu, Chen-Chi [6 ]
Cheng, Tzu-Hao [5 ]
机构
[1] Natl Yang Ming Univ, Sch Med, Inst Emergency & Crit Care Med, Taipei 112, Taiwan
[2] Taipei Vet Gen Hosp, Dept Surg, Div Thorac Surg, Taipei, Taiwan
[3] Natl Yang Ming Univ, Dept Biomed Imaging & Radiol Sci, Taipei 112, Taiwan
[4] Taipei City Hosp, Zhongxiao Branch, Div Nucl Med, Taipei, Taiwan
[5] Natl Yang Ming Univ, Inst Biochem & Mol Biol, Taipei 112, Taiwan
[6] Natl Yang Ming Univ, Sch Med, Inst Clin Med, Taipei 112, Taiwan
关键词
INITIATION-FACTOR; 4E; TARGETED THERAPIES; SIGNALING PATHWAY; PROSTATE-CANCER; PHASE-I; MTOR; EXPRESSION; TRANSLATION; ACTIVATION; EVEROLIMUS;
D O I
10.1016/j.jtcvs.2014.09.047
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Objectives: Rapamycin inhibits products of molecular pathways in esophageal squamous cell carcinoma and limits tumor cell growth by targeting 4E-BP1- and eIF4E-dependent gene translation. In this study, we investigate the influence of 4E-BP1-to-eIF4E ratio on rapamycin response in esophageal squamous cell carcinoma cells, and the underlying mechanism is discussed. Methods: The response to rapamycin treatment was examined in 6 esophageal cancer cell lines. Adjustment of the 4E-BP1/eIF4E ratio was carried out by knockdown or overexpression of 4E-BP1 and eIF4E. The relationship between Egr-1 and 4E-BP1 expression in esophageal cancer cells was also studied. Results: The 4E-BP1/eIF4E ratio was adjusted to evaluate the response to rapamycin treatment in TE1 and TE2 esophageal cancer cells. TE2 cells are sensitized to rapamycin treatment after overexpression of 4E-BP1 or knockdown of eIF4E; TE1 cells become resistant to rapamycin after knockdown of 4E-BP1 or overexpression of eIF4E. These data suggest that the 4E-BP1/eIF4E ratio is a determinant for the response of TE1 and TE2 cells to rapamycin treatment. Egr-1 expression was higher in TE2 cells compared with other esophageal cancer cell lines, and its knockdown increased 4E-BP1 expression in TE2 cells, which became sensitive to rapamycin treatment. Conclusions: The 4E-BP1/eIF4E ratio is a determinant of the response of rapamycin treatment in esophageal cancer cells. Egr-1 can reduce 4E-BP1 gene expression and render esophageal squamous cell carcinoma cells resistant to rapamycin with a relatively low 4E-BP1/eIF4E ratio. Thus, the 4E-BP1/eIF4E ratio may represent a therapeutic index for the prediction of clinical outcome of rapamycin treatment in patients with esophageal squamous cell carcinoma.
引用
收藏
页码:378 / 385
页数:8
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