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Oncogenic Kit controls neoplastic mast cell growth through a Stat5/PI3-kinase signaling cascade

Abstract : The D816V-mutated variant of Kit triggers multiple signaling pathways and is considered essential for malignant transformation in mast cell (MC) neoplasms. We here describe that constitutive activation of the Stat5-PI3K-Akt-cascade controls neoplastic MC development. Retrovirally transduced active Stat5 (cS5F) was found to trigger PI3K and Akt activation, and to transform murine bone marrow progenitors into tissue-infiltrating MCs. Primary neoplastic Kit D816V+ MCs in patients with mastocytosis also displayed activated Stat5, which was found to localize to the cytoplasm and to form a signaling complex with PI3K, with consecutive Akt activation. Finally, the knock-down of either Stat5 or Akt activity resulted in growth inhibition of neoplastic Kit D816V+ MCs. These data suggest that a downstream Stat5-PI3K-Akt signaling cascade is essential for Kit D816V-mediated growth and survival of neoplastic MCs
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https://hal-univ-tours.archives-ouvertes.fr/hal-02424605
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Submitted on : Saturday, October 30, 2021 - 10:07:39 AM
Last modification on : Tuesday, January 11, 2022 - 5:56:33 PM

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Noria Harir, Cedric Boudot, Katrin Friedbichler, Karoline Sonneck, Rudin Kondo, et al.. Oncogenic Kit controls neoplastic mast cell growth through a Stat5/PI3-kinase signaling cascade. Blood, American Society of Hematology, 2008, 112 (6), pp.2463-2473. ⟨10.1182/blood-2007-09-115477⟩. ⟨hal-02424605⟩

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