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Low-dose Methotrexate Inhibits Lung Metastasis and Lengthens Survival in Rat Osteosarcoma

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Abstract

Lung metastasis is the most crucial event affecting the treatment of osteosarcoma and is dependent on tumor angiogenesis. To improve the prognosis for patients with osteosarcoma, prevention of lung metastasis is essential. Low-dose methotrexate is a useful drug for treating a variety of diseases. Low-dose methotrexate reportedly plays a role in antiangiogenesis for the synovial blood vessels in rheumatoid arthritis. However, whether low-dose methotrexate is correlated with tumor angiogenesis and metastasis is unclear. We investigated the inhibitory effect of methotrexate on lung metastasis in a rat osteosarcoma cell line with high metastatic potential, S-SLM. Two weeks after inoculation of S-SLM cells into male Fischer 344 rats, low-dose methotrexate (1.2 mg/kg once or twice a week) or saline was intraperitonealy injected for 4 weeks and the antimetastatic effect was evaluated. Low-dose methotrexate significantly reduced the number of lung metastatic nodules and the wet weight of the lungs. Immunohistochemical staining showed a decrease in microvessel density in the metastatic nodules. We also evaluated the effect of methotrexate on the proliferation of endothelial cells and S-SLM osteosarcoma cells in vitro. Methotrexate significantly inhibited the proliferation of endothelial cells at a lower concentration than that of S-SLM osteosarcoma cells. These data suggest that low-dose methotrexate inhibited lung metastasis of osteosarcoma through its antiangiogenic activity. Our results indicate that low-dose methotrexate is a promising drug for tumor dormancy therapy in patients with osteosarcoma and lung metastasis.

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Authors and Affiliations

  1. Department of Orthopedic Surgery, Mie University School of Medicine, Tsu, Mie, Japan

    Ryota Tomoda, Masashi Seto, Yasunari Hioki, Jun Sonoda, Akihiko Matsumine, Katsuyuki Kusuzaki & Atsumasa Uchida

  2. Department of Orthopedic Surgery, Mie University School of Medicine, 2-174 Edobashi, Tsu, Mie, 514-8507, Japan

    Ryota Tomoda

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  1. Ryota Tomoda
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  2. Masashi Seto
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  3. Yasunari Hioki
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  4. Jun Sonoda
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  5. Akihiko Matsumine
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  6. Katsuyuki Kusuzaki
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  7. Atsumasa Uchida
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Correspondence to Ryota Tomoda.

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Tomoda, R., Seto, M., Hioki, Y. et al. Low-dose Methotrexate Inhibits Lung Metastasis and Lengthens Survival in Rat Osteosarcoma. Clin Exp Metastasis 22, 559–564 (2005). https://doi.org/10.1007/s10585-005-5377-y

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  • DOI: https://doi.org/10.1007/s10585-005-5377-y

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