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Cell and Tumor Biology |
1 Laboratory of Angiogenesis Research, Microbiology and Tumor Biology Center, and 2 Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden and Departments of 3 Molecular and Medical Pharmacology and 4 Urology, David Geffen School of Medicine at University of California, Los Angeles, California
Requests for reprints: Yihai Cao, Microbiology and Tumor Biology Center, Karolinska Institutet, 171 77 Stockholm, Sweden. Phone: 46-8-5248-7596; Fax: 46-8-31-94-70; E-mail: yihai.cao{at}mtc.ki.se.
Metastases are commonly found in the lymphatic system. The molecular mechanism of lymphatic metastasis is, however, poorly understood. Here we report that vascular endothelial growth factor (VEGF)-A stimulated lymphangiogenesis in vivo and that overexpression of VEGF-A in murine T241 fibrosarcomas induced the growth of peritumoral lymphatic vessels, which occasionally penetrated into the tumor tissue. As a result of peritumoral lymphangiogenesis, metastases in lymph nodes of mice were detected. VEGF-A–overexpressing tumors contained high numbers of infiltrating inflammatory cells such as macrophages, which are known to express VEGF receptor (VEGFR)-1. It seemed that in the mouse cornea, VEGF-A stimulated lymphangiogenesis through a VEGF-C/-D/VEGFR-3–independent pathway as a VEGFR-3 antagonist selectively inhibited VEGF-C–induced, but not VEGF-A–induced, lymphangiogenesis. Our data show that VEGF-A contributes to lymphatic mestastasis. Thus, blockage of VEGF-A–induced lymphangiogenesis may provide a novel approach for prevention and treatment of lymphatic metastasis.
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