alexa The NPM-ALK oncoprotein abrogates CD30 signaling and constitutive NF-kappaB activation in anaplastic large cell lymphoma.


Journal of Clinical & Cellular Immunology

Author(s): Horie R, Watanabe M, Ishida T, Koiwa T, Aizawa S,

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Abstract NPM-ALK characterizes anaplastic large cell lymphoma (ALCL), as does the high expression of CD30, a feature shared with H-RS cells of classic Hodgkin's lymphoma. In H-RS cells, ligand-independent signaling by overexpressed CD30 drives constitutive NF-kappaB activation, which is absent in ALCL cells. Here we show that NPM-ALK impedes CD30 signaling and NF-kappaB activation, dependent on both ALK kinase activity and the N-terminal NPM domain. NPM-ALK transduction into H-RS cell lines abrogates recruitment and aggregation of TRAF proteins, inducing an ALCL-like morphology and phenotype. TRAF2 associates with NPM-ALK at a consensus binding motif located in the kinase domain. Thus, NPM-ALK abrogates CD30-driven NF-kappaB activation and can also induce an ALCL phenotype, distinguishing ALCL cells from H-RS cells of T cell origin.
This article was published in Cancer Cell and referenced in Journal of Clinical & Cellular Immunology

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