Volume 13, Issue 8b pp. 2271-2281

A novel strategy for tumour therapy combining cell apoptosis and active immunity induced by caspy2, a zebrafish caspase

Lei Liu

Lei Liu

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

These authors contributed equally to this work.

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Hongxin Deng

Corresponding Author

Hongxin Deng

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

These authors contributed equally to this work.

Correspondence to: Hongxin DENG and Yuquan Wei, State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Ke-yuan Road 4, No.1, Gao-peng Street, Chengdu, Sichuan, 610041, The People’s Republic of China.
Tel.: +86–28-85164059
Fax: +86–28-85164060
E-mail: [email protected], [email protected]Search for more papers by this author
Yongsheng Wang

Yongsheng Wang

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

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Ping Chen

Ping Chen

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

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Yang Yang

Yang Yang

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

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Hanshuo Yang

Hanshuo Yang

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

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Xiancheng Chen

Xiancheng Chen

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

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Lijuan Chen

Lijuan Chen

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

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Wen Zhu

Wen Zhu

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

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Shufang Liang

Shufang Liang

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

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Jinliang Yang

Jinliang Yang

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

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Zhiyong Qian

Zhiyong Qian

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

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Jiong Li

Jiong Li

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

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Yanjun Wen

Corresponding Author

Yanjun Wen

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

Correspondence to: Hongxin DENG and Yuquan Wei, State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Ke-yuan Road 4, No.1, Gao-peng Street, Chengdu, Sichuan, 610041, The People’s Republic of China.
Tel.: +86–28-85164059
Fax: +86–28-85164060
E-mail: [email protected], [email protected]Search for more papers by this author
Bin Kan

Bin Kan

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

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Yongqiu Mao

Yongqiu Mao

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

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Xia Zhao

Xia Zhao

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

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Yuquan Wei

Yuquan Wei

State Key Laboratory of Biotherapy, West China Hospital and College of Life Science, Sichuan University, Chengdu, Sichuan, The People’s Republic of China

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First published: 11 February 2009
Citations: 4

Abstract

Caspy2, a zebrafish protease, is an active caspase for inducing apoptosis in mammalian cells. To investigate whether caspy2-mediated apoptosis could be used in cancer therapy, its cDNA was amplified and cloned into eukaryotic expression vector pcDNA3.1+. The recombinant plasmid was mixed with cationic liposome and introduced into various tumour cell lines in vitro. Our data showed that caspy2 induced remarkable apoptosis of cancer cells in vitro. Treatment of mice-bearing CT26 colon carcinoma or MethA fibrosarcoma with intratumoral injection of liposome-caspy2 plasmid complex resulted in substantial killing of neoplastic cells and long-term survivors. Apoptotic cells were widely distributed in caspy2-treated tumour tissue. Infiltration of CD8+ T lymphocyte was also observed apparently in the tumour tissue after the treatment with caspy2. Tumour-specific major histocompatibility complex (MHC) class I-dependent CD8+ cytotoxic T lymphocyte activity was found by means of 51Cr release assay. In MethA model, the mice acquired a long-time protective immunity against the parental tumour cell re-challenge. These results indicated that caspy2 can act as both apoptosis inducer and immune response initiator, which may account for its extraordinary antitumour effect. Furthermore, in vivo depletion of CD8+ T lymphocytes could completely abrogate the antitumour immune activity, whereas the depletion of CD4+ cells showed partial abrogation. In this study, we developed a novel anticancer strategy that combines both induction of apoptosis and immune response in mice-bearing tumours with a single caspy2 gene. This approach may provide an important way for treatment of cancer.

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