Volume 100, Issue 7 pp. 1351-1358
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Systemic NK4 gene therapy inhibits tumor growth and metastasis of melanoma and lung carcinoma in syngeneic mouse tumor models

Yuko Kishi

Yuko Kishi

Division of Molecular Regenerative Medicine, Osaka University Graduate School of Medicine, Suita, Osaka;

Present address: Clinical Operations Center, Sanofi-Aventis in Japan, Tokyo, Japan.

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Keiji Kuba

Keiji Kuba

Division of Molecular Regenerative Medicine, Osaka University Graduate School of Medicine, Suita, Osaka;

Division of Molecular Pharmacology and Experimental Therapeutics, Department of Physiology and Pharmacology, Akita University Graduate School of Medicine, Akita;

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Takahiro Nakamura

Takahiro Nakamura

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

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Jinhua Wen

Jinhua Wen

Peking University Stem Cell Research Center and Cell Biology Department, Peking University Health Science Center, Beijing, China;

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Yoshinori Suzuki

Yoshinori Suzuki

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

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Shinya Mizuno

Shinya Mizuno

Division of Molecular Regenerative Medicine, Osaka University Graduate School of Medicine, Suita, Osaka;

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Toshihiro Nukiwa

Toshihiro Nukiwa

Department of Respiratory Oncology and Molecular Medicine, Institute of Development, Aging, and Cancer, Tohoku University, Sendai;

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Kunio Matsumoto

Kunio Matsumoto

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

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Toshikazu Nakamura

Corresponding Author

Toshikazu Nakamura

Division of Molecular Regenerative Medicine, Osaka University Graduate School of Medicine, Suita, Osaka;

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

To whom correspondence should be addressed. E-mail: [email protected]Search for more papers by this author
First published: 10 June 2009
Citations: 23

Abstract

Hepatocyte growth factor (HGF) promotes malignant development of cancer cells by enhancing invasion and metastasis. NK4, a competitive antagonist for HGF, is a bifunctional molecule that acts as a HGF antagonist and angiogenesis inhibitor. Although successful tumor inhibition by NK4 gene expression in tumor models has been demonstrated, the effects of systemic NK4 gene introduction are yet to be addressed. Here we show that systemic administration of a replication-defective adenovirus expressing NK4 (Ad.NK4) inhibits tumor growth and lung metastasis of B16F10 melanoma and Lewis lung carcinoma in syngeneic mice. Single tail-vein injection of Ad.NK4 achieved therapeutic levels of NK4 in the circulation and in multiple organs. Despite NK4 expression that was highest in the liver, toxicity in the liver was minimal. Ad.NK4-mediated growth inhibition was associated with decreased blood vessel density and increased apoptosis in tumor tissues, which suggests that NK4 suppressed tumor growth as an angiogenesis inhibitor. Metastasis of B16F10 melanoma and Lewis lung carcinoma cells to the lung was potently inhibited by systemic Ad.NK4-administration. Our results demonstrated that the adenovirus-mediated induction of high levels of circulating NK4 significantly inhibited in vivo tumor growth and distant metastasis without obvious side effects. NK4 gene therapy is thus a safe and promising strategy for the treatment of cancer patients, and further validation in clinical trials is needed. (Cancer Sci 2009; 100: 1351–1358)

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