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Pivotal Role of CXCR3 in Melanoma Cell Metastasis to Lymph Nodes

Departments of ¹ Pharmacology, ² Clinical Pathology, and ³ Gastroenterological Surgery, Graduate School of Medicine, Kyoto University, Kyoto; ⁴ Kitano Hospital Medical Institute, Osaka; and Departments of ⁵ Animal Development and Physiology, and ⁶ Immunology and Cell Biology, Graduate School of Biostudies, Kyoto University, Kyoto, Japan

Chemokines and their receptors play key roles in leukocyte trafficking and are also implicated in cancer metastasis to specific organs. Here we show that mouse B16F10 melanoma cells constitutively express chemokine receptor CXCR3, and that its ligands CXCL9/Mig, CXCL10/IP-10, and CXCL11/I-TAC induce cellular responses in vitro, such as actin polymerization, migration, invasion, and cell survival. To determine whether CXCR3 could play a role in metastasis to lymph nodes (LNs), we constructed B16F10 cells with reduced CXCR3 expression by antisense RNA and investigated their metastatic activities after s.c. inoculations to syngeneic hosts, C57BL/6 mice. The metastatic frequency of these cells to LNs was markedly reduced to 15% (P < 0.05) compared with the parental or empty vector-transduced cells. On the other hand, pretreatment of mice with complete Freund’s adjuvant increased the levels of CXCL9 and CXCL10 in the draining LNs, which caused 2.5–3.0-fold increase (P < 0.05) in the metastatic frequency of B16F10 cells to the nodes with much larger foci. Importantly, such a stimulation of metastasis was largely suppressed when CXCR3 expression in B16F10 cells was reduced by antisense RNA or when mice were treated with specific antibodies against CXCL9 and CXCL10. We also demonstrate that CXCR3 is expressed on several human melanoma cell lines as well as primary human melanoma tissues (5 of 9 samples tested). These results suggest that CXCR3 inhibitors may be promising therapeutic agents for treatment of LN metastasis, including that of melanoma.

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