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Molecular Targeted Regulation Studies and Therapy

The JAK2 inhibitor AG490 predominantly abrogates the growth of human B-precursor leukemic cells with 11q23 translocation or Philadelphia chromosome

Leukemia volume 15, pages 1758–1768 (2001)Cite this article

Abstract

The Janus kinase (JAK) family is one of intracellular protein tyrosine kinases (PTKs) present in hematopoietic and lymphoid cells and has been shown to play a crucial role in a variety of biological responses. It was reported that a human B-precursor leukemic cell line was potently inhibited in its proliferation by one of synthetic PTK inhibitors (tyrphostins), AG490, via anti-JAK2 activity. However, no extensive studies about it have been performed. In the present study, we tested 16 human lymphoid leukemic cell lines (B-precursor, 12; T cell, four) for their sensitivity to AG490 using 3H-thymidine incorporation and colony formation assays, and found that B-precursor cell lines with 11q23 translocation or Philadelphia chromosome (Ph1) whose JAK2 proved to be constitutively phosphorylated were predominantly sensitive to AG490 at a concentration that has few inhibitory effect on normal hematopoiesis. We first revealed the association of JAK2 with BCR-ABL in Ph1-positive cell lines and with Bruton's tyrosine kinase (BTK) in cell lines with 11q23 translocation by coimmunoprecipitation experiments. Of interest, AG490 markedly down-regulated phosphorylation of JAK2, but rather transiently up-regulated phosphorylation of BCR-ABL and BTK, suggesting direct implication of AG490 in the process of the JAK2 dephosphorylation. These results indicate that AG490 exerts a potent inhibitory activity to B-precursor leukemia with specific chromosomal abnormalities, and a therapeutic approach using AG490 is expected.

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Authors and Affiliations

  1. Department of Pediatrics, Yamanashi Medical University, Yamanashi, Japan

    N Miyamoto, K Sugita, K Goi, T Inukai, K Iijima, T Tezuka, S Kojika, M Nakamura, K Kagami & S Nakazawa

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Miyamoto, N., Sugita, K., Goi, K. et al. The JAK2 inhibitor AG490 predominantly abrogates the growth of human B-precursor leukemic cells with 11q23 translocation or Philadelphia chromosome. Leukemia 15, 1758–1768 (2001). https://doi.org/10.1038/sj.leu.2402260

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