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  • Title: NIK controls classical and alternative NF-κB activation and is necessary for the survival of human T-cell lymphoma cells.
    Author: Odqvist L, Sánchez-Beato M, Montes-Moreno S, Martín-Sánchez E, Pajares R, Sánchez-Verde L, Ortiz-Romero PL, Rodriguez J, Rodríguez-Pinilla SM, Iniesta-Martínez F, Solera-Arroyo JC, Ramos-Asensio R, Flores T, Palanca JM, Bragado FG, Franjo PD, Piris MA.
    Journal: Clin Cancer Res; 2013 May 01; 19(9):2319-30. PubMed ID: 23536439.
    Abstract:
    PURPOSE: Peripheral T-cell lymphomas (PTCL) are a heterogeneous entity of neoplasms with poor prognosis, a lack of effective therapies, and a largely unknown molecular pathology. Deregulated NF-κB activity has been associated with several lymphoproliferative diseases, but its importance in T-cell lymphomagenesis is poorly understood. We investigated the function of the NF-κB-inducing kinase (NIK), in this pathway and its role as a potential molecular target in T-cell lymphomas. EXPERIMENTAL DESIGN: We used immunohistochemistry to analyze the expression of different NF-κB members in primary human PTCL samples and to study its clinical impact. With the aim of inhibiting the pathway, we used genetic silencing of NIK in several T-cell lymphoma cell lines and observed its effect on downstream targets and cell viability. RESULTS: We showed that the NF-κB pathway was activated in a subset of PTCLs associated with poor overall survival. NIK was overexpressed in a number of PTCL cell lines and primary samples, and a pivotal role for NIK in the survival of these tumor cells was unveiled. NIK depletion led to a dramatic induction of apoptosis in NIK-overexpressing cell lines and also showed a more pronounced effect on cell survival than inhibitor of kappa B kinase (IKK) knockdown. NIK silencing induced a blockage of both classical and alternative NF-κB activation and reduced expression of several prosurvival and antiapoptotic factors. CONCLUSIONS: The results of the present study indicate that NIK could be a promising therapeutic target in these aggressive malignancies.
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