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[Cancer Research 62, 6682-6687, November 15, 2002]
© 2002 American Association for Cancer Research


Tumor Biology

Essential Roles of Tumor Necrosis Factor Receptor p55 in Liver Metastasis of Intrasplenic Administration of Colon 26 Cells

Hidekazu Kitakata, Yoko Nemoto-Sasaki, Yutaka Takahashi, Toshikazu Kondo, Masayoshi Mai and Naofumi Mukaida1

Divisions of Molecular Bioregulation [H. K., Y. N-S., N. M.] and Surgical Oncology, Cancer Research Institute [H. K., Y. T., M. M.], and Division of Environmental, Forensic, and Environmental Social Medicine, Graduate School of Medicine [T. K.], Kanazawa University, Kanazawa 920-0934, Japan

Intrasplenic administration of a colon adenocarcinoma cell line, colon 26, induced tumor necrosis factor (TNF) {alpha} protein expression around the central and portal veins of the liver at 3 days, and liver metastases by 24 days after the tumor injection, in 90% of wild-type (WT) mice. To explore the roles of TNF-{alpha} in the process, we administered colon 26 cells into tumor necrosis factor receptor p55 (TNF-Rp55) knockout (KO) mice. Less than 50% of TNF-Rp55 KO mice developed liver metastasis with significantly lower liver weights and the volumes of metastatic foci. These observations suggest the critical roles of TNF-Rp55-mediated signals in this liver metastasis model. The intrasplenic tumor injection induced mRNA expressions of vascular endothelial growth factor, heparin-binding epidermal growth factor, matrix metalloproteinase-9, and tissue inhibitor of matrix metalloproteinase-1 at similar levels in the livers of both WT and TNF-Rp55 KO mice. Immunohistochemical analyses of the livers of WT mice after tumor injection demonstrated the enhanced expression of vascular cell adhesion molecule (VCAM)-1 and E-selectin on sinusoidal endothelial cells. Enhanced E-selectin expression was similarly observed in the liver of TNF-Rp55 KO mice after tumor injection. However, the enhancement in VCAM-1 mRNA expression and its protein production was significantly attenuated in the liver of TNF-Rp55 KO mice when compared with WT mice. Collectively, these observations suggest that TNF-Rp55-mediated signals can up-regulate both VCAM-1 expression in the liver and subsequent liver metastasis after intrasplenic tumor injection.




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Copyright © 2002 by the American Association for Cancer Research.