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A Small Interfering CD147-Targeting RNA Inhibited the Proliferation, Invasiveness, and Metastatic Activity of Malignant Melanoma

¹ Department of Dermatology, XiangYa Hospital, Central South University, Changsha, Hunan, China and ² Department of Dermatology, Field of Sensory Organology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan

Requests for reprints: Xiang Chen, Department of Dermatology, XiangYa Hospital, Central South University, XiangYa Road, Changsha, Hunan 410008, China. Phone: 86-731-432-7128; Fax: 86-731-432-8478; E-mail: chenxck{at}yahoo.com.

CD147 plays a critical role in the invasive and metastatic activity of malignant melanoma cells by stimulating the surrounding fibroblasts to express matrix metalloproteinases and vascular endothelial growth factor. We developed a system that blocks CD147 in the human malignant melanoma cell line, A375, using RNA interference. By transfecting melanoma cells with the small interfering RNA (siRNA) that targets human CD147, we were able to establish two stable clones in which CD147 expression was significantly down-regulated. This resulted in the decreased proliferation and invasion of A375 cells in vitro. CD147 siRNA also down-regulated the expression of vascular endothelial growth factor in these cells and reduced the migration of vascular endothelial cells. The reduction in the CD147 level suppressed the size of s.c. tumors and the microvessel density in an A375 s.c. nude mouse xenograft model. In addition, the in vivo metastatic potential of A375 cells transfected with CD147 siRNA was suppressed in a nude mouse model of pulmonary metastasis. (Cancer Res 2006; 66(23): 11323-30)

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