Abstract
Recently, we reported that a cytosolic isoform of protein-tyrosine phosphatase ɛ (PTPɛC), when overexpressed, inhibits terminal differentiation and apoptosis of murine M1 myeloblastic leukemia cells induced by interleukin-6. To determine whether these observed effects in vitro correspond to a tumorigenicity of PTPɛC-expresser (M1-ɛC) cells in vivo, parent M1 and M1-ɛC cells were intravenously inoculated into scid or nude mice, and survival of mice receiving these cell lines was monitored. Unexpectedly, both scid and nude mice inoculated with M1-ɛC cells showed significantly prolonged survival time than those receiving parent M1 cells. While parent M1 cells inoculated by intravenous injection formed metastatic tumors in the spleen, expression of PTPɛC suppressed tumor development in the spleen. The results suggest a suppressive role of PTPɛC in tumorigenesis.
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Acknowledgements
We acknowledge Dr T Abo (Niigata University) for providing murine IFN-γ and Ajinomoto Co. (Yokohama, Japan) for IL-6. We are grateful to Dr M Hosokawa (Health Sciences University of Hokkaido) for critical reading of the manuscript. Thanks are also due to E Yoshida for secretarial assistance. This work was supported by a Grant-in-aid for Scientific Research on Priority Area (C) (2) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, Grant-in-aids for Scientific Research (B) and for Young Scientist (B) from the Japan Society for the Promotion of Science, and in part by a Grant from the Takeda Foundation.
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Tanuma, N., Shima, H., Shimada, S. et al. Reduced tumorigenicity of murine leukemia cells expressing protein-tyrosine phosphatase, PTPɛC. Oncogene 22, 1758–1762 (2003). https://doi.org/10.1038/sj.onc.1206267
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DOI: https://doi.org/10.1038/sj.onc.1206267
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