Volume 125, Issue 12 pp. 2879-2886
Tumor Immunology

Gene transfer of NK4, an angiogenesis inhibitor, induces CT26 tumor regression via tumor-specific T lymphocyte activation

Takeshi Kubota

Corresponding Author

Takeshi Kubota

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

Fax: +81-75-251-5522.

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kamigyo-ku, Kyoto 602-8566 JapanSearch for more papers by this author
Hiroaki Taiyoh

Hiroaki Taiyoh

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

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Atsushi Matsumura

Atsushi Matsumura

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

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Yasutoshi Murayama

Yasutoshi Murayama

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

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Daisuke Ichikawa

Daisuke Ichikawa

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

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Kazuma Okamoto

Kazuma Okamoto

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

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Hitoshi Fujiwara

Hitoshi Fujiwara

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

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Hisashi Ikoma

Hisashi Ikoma

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

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Masayoshi Nakanishi

Masayoshi Nakanishi

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

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Shojiro Kikuchi

Shojiro Kikuchi

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

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Toshiya Ochiai

Toshiya Ochiai

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

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Chouhei Sakakura

Chouhei Sakakura

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

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Yukihito Kokuba

Yukihito Kokuba

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

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Teruhisa Sonoyama

Teruhisa Sonoyama

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

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Yoshinori Suzuki

Yoshinori Suzuki

Division of Tumor Dynamics and Regulation, Kanazawa University Cancer Research Institute, Kanazawa, Japan

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Kunio Matsumoto

Kunio Matsumoto

Division of Tumor Dynamics and Regulation, Kanazawa University Cancer Research Institute, Kanazawa, Japan

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Toshikazu Nakamura

Toshikazu Nakamura

Kringle Pharma Joint Research Division for Regenerative Drug Discovery, Center for Advanced Science and Innovation, Osaka University, Osaka, Japan

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Eigo Otsuji

Eigo Otsuji

Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

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First published: 08 July 2009
Citations: 3

Abstract

Hepatocyte growth factor (HGF) has been shown to be involved in malignant behaviors, such as invasion and metastasis, in different tumors. Hence, HGF could be a target molecule for control of the malignant potential of cancer. NK4 is a competitive antagonist for HGF and exerts an antitumor activity, not only by HGF antagonism but also by antiangiogenesis. Here, we studied the participation of cellular immunity in CT26 tumor regression by NK4 gene transfer. In vivo experiments showed that NK4-induced inhibition of subcutaneous tumor growth (as demonstrated in immunocompetent BALB/c mice) was weakened in T lymphocyte-deficient nude mice. In addition, the immunocompetent BALB/c mice that had shown complete regression of CT26-NK4 tumors generated an immune memory against repeated challenge with the same tumor antigen. Immunohistochemistry of tumor-infiltrating lymphocytes showed that the ratio of CD8/CD4 in CT26-NK4 tumors was significantly higher than that in control tumors. Also, the presence of tumor-specific cytotoxic T lymphocytes (CTL) was demonstrated by cytotoxicity assays. Depletion of CD8+ T lymphocytes markedly abrogated the antitumor activity of NK4. However, NK4 had no direct effect on the in vitro cellular immune system. Taken together, these data indicate that NK4 expression by gene transfer, at the tumor site, triggers tumor-specific CTL activation, resulting in complete CT26 tumor regression in vivo. This action was considered to be due to apoptosis induced by NK4's potent antiangiogenic and HGF antagonistic effects. © 2009 UICC

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