Published in:
01-06-2010 | Original Paper
Expression of IL-13Rα2 in liver cancer cells and its effect on targeted therapy of liver cancer
Authors:
Lingling Hou, Juan Du, Jianwei Wang, Yanfeng Liu, Weimin Sun, Yanpeng Zheng, Lishu Zhang, Honggang Hu, Xinxian Dai, Weijun Guan, Yuehui Ma, Tao Hong
Published in:
Journal of Cancer Research and Clinical Oncology
|
Issue 6/2010
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Abstract
Purpose
Liver cancer is the third leading cause of cancer-related deaths globally. The number of liver cancers diagnosed in the world is increasing at an alarming rate. It is of great significance to find the new targets of the tumor cells and specific medicine. This research investigated the expression of interleukin-13 receptor α2 (IL-13Rα2) in different liver cancer cell lines and liver cancer tissues, and assessed the cytotoxin DT389-hIL13-13E13K (IL-13 and diphtheria toxin fusion protein) targeted killing effect on liver cancer cells. Based on study above, we further analyzed the function of IL-13Rα2 on the targeted liver cancer therapy. The results will provide a novel strategy and an alternative way for liver cancer therapy.
Methods
The expression of IL-13Rα2 in different liver cancer cell lines and tissues were analyzed by RT-PCR and immunohistochemistry. Cytotoxicity assay of DT389-hIL13-13E13K was performed in eight different concentrations in liver cancer cell lines in vitro. At the same time, siRNA-mediated knockdown was introduced to assess the role of IL-13Rα2 in liver cancer therapy.
Results
Two out of four tested liver cancer cell lines and 27 out of 33 (81.82%) liver tissues expressed the IL-13Rα2. The fusion protein DT389-hIL13-13E13K showed a moderate cytotoxicity to the cancer cell line BEL-7402 in vitro, which 50% inhibition (IC50) concentration occurred at 1.4 × 10−5 M. Besides, the sensitivity to fusion protein DT389-hIL13-13E13K was decreased in siRNA-transfected liver cells compared with control ones. These results suggest that IL-13Rα2 chain is a specific target for IL-13-directed fusion protein.
Conclusions
We reported the expression of IL-13Rα2 in liver cancer cell lines and tissues as well as investigated the cytotoxin (DT389-hIL13-13E13K) targeted killing efficiency of liver cancer cells and potential role of IL-13Rα2 in the cancer treatment.