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Okabe-Kado, J. et al.

Junko Okabe-Kado, Takashi Kasukabe, Yoshio Honma, Hirofumi Kobayashi, Nobuo Maseki, Yasuhiko Kaneko,

Extracellular NM23 protein promotes the growth and survival of primary cultured human acute myelogenous leukemia cells.

An elevated serum level of NM23-H1 protein is found in acute myelogenous leukemia (AML), and predicts a poor treatment outcome in AML patients. To investigate the potential pathological link between the elevated serum level of this protein and poor prognosis, we examined the extracellular effects of recombinant NM23-H1 protein on the in vitro growth and survival of primary cultured AML cells at concentrations equivalent to the levels found in the serum of AML patients. Extracellular NM23-H1 protein promoted the in vitro growth and survival of AML cells and this activity was associated with the cytokine production and activation of the MAPK and signal transducers and activators of transcription signaling pathways. Inhibitors specific to MAPK signaling pathways inhibited the growth- and survival-promoting activity of NM23-H1. These findings indicate the novel biological action of extracellular NM23-H1 and its association with poor prognosis, and suggest an important role for extracellular NM23-H1 in the malignant progression of leukemia and a potential therapeutic target for these malignancies.[1]

References

Extracellular NM23 protein promotes the growth and survival of primary cultured human acute myelogenous leukemia cells. Okabe-Kado, J., Kasukabe, T., Honma, Y., Kobayashi, H., Maseki, N., Kaneko, Y. Cancer Sci. (2009) [Pubmed]

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