Activation of the NF-κB pathway by the leukemogenic TEL-Jak2 and TEL-Abl fusion proteins leads to the accumulation of antiapoptotic IAP proteins and involves IKKα

S. Malinge, R. Monni, O. Bernard, V. Penard-Lacronique

Résultats de recherche: Contribution à un journalArticleRevue par des pairs

28 Citations (Scopus)

Résumé

Abnormal activation of tyrosine kinases and of signaling pathways they control plays a critical role in the neoplastic process of human hematopoietic malignancy. The nuclear factor-κB (NF-κB) pathway is one of the signalings activated by the TEL-Jak2 and TEL-Abl oncoproteins and required for their antiapoptotic activity. To define the signal relay responsible for this activation, we used mouse embryonic fibroblast (MEF) cells and observed that TEL-Jak2- and TEL-Abl-mediated NF-κB induction was abolished in cells lacking the IκB kinase (IKK)α but not in IKKβ-+- cells. Similar observations were performed with oncogenic forms of the FMS-like tyrosine kinase 3 (Flt-3) involved in the pathogenesis of one-third of acute myeloid leukemias. Rescue of TEL-Jak2-mediated NF-κB activation was obtained with a kinase-proficient form of IKKα in IKKα-+- MEF. Hematopoietic cells transformed by TEL-Jak2 and TEL-Abl showed sustained IKKα activity without promotion of NF-κB2/p100 processing, generally associated to IKKα functions. Furthermore, IAP1, IAP2 and XIAP, which are central regulators of the NF-κB-mediated survival pathway, were highly expressed in cells transformed by these oncoproteins. Our results indicate that these oncogenic tyrosine kinases preferentially use an IKKα-dependent mechanism to induce a persistent NF-κB activity and allow the production of antiapoptotic effectors that participate to their leukemogenic properties.

langue originaleAnglais
Pages (de - à)3589-3597
Nombre de pages9
journalOncogene
Volume25
Numéro de publication25
Les DOIs
étatPublié - 15 juin 2006
Modification externeOui

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