Volume 123, Issue 3 pp. 702-708
Cancer Therapy

IFN-γ withdrawal after immunotherapy potentiates B16 melanoma invasion and metastasis by intensifying tumor integrin αvβ3 signaling

Wei Gong

Wei Gong

Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China

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Gui-Mei Zhang

Gui-Mei Zhang

Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China

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Yi Liu

Yi Liu

Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China

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Zhang Lei

Zhang Lei

Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China

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Dong Li

Dong Li

Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China

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Ye Yuan

Ye Yuan

Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China

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Bo Huang

Corresponding Author

Bo Huang

Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China

Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of ChinaSearch for more papers by this author
Zuo-Hua Feng

Corresponding Author

Zuo-Hua Feng

Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China

Fax: +86-27-83650754

Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of ChinaSearch for more papers by this author
First published: 28 May 2008
Citations: 32

Abstract

Immunotherapy can effectively suppress tumor, yet complete tumor eradication occurs infrequently. The metastatic potential of remnant tumor cells after immunotherapy and the underlying mechanisms have not been fully elucidated. Here, we report that the termination of immunotherapy strikingly increases the metastatic potential of remnant melanoma. This is mainly due to the withdrawal of IFN-γ after immunotherapy. The relief of IFN-γ stress led to the increase of αvβ3 integrin expression in B16 cells, which increased the adhesion of B16 cells to fibrinogen, fibronectin and laminin. Through αvβ3 signaling, the activation of FAK, upregulation of cdc2, production of active MMP-2 and MMP-9 and actin polymerization were intensified in B16 cells stimulated with ECM molecules 24 h after the withdrawal of IFN-γ. The i.v. injection of such tumor cells into mice resulted in more metastatic tumor nodes in lung and shortened the survival of mice. The pitfall of immunotherapy termination can be remedied by the administration of recombinant CBD-HepII polypeptide of fibronectin, which effectively inhibits αvβ3 signaling. These findings suggest that the risk of tumor metastasis can be increased after the termination of immunotherapy, due to the withdrawal of IFN-γ and that targeting αvβ3 signaling pathway can improve the therapeutic effect of immunotherapeutic approaches by reducing such metastatic risk. © 2008 Wiley-Liss, Inc.

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