ERK5 activates NF-kappaB in leukemic T cells and is essential for their growth in vivo

Abstract : MAPK cascades play a central role in the cellular response to the environment. The pathway involving the MAPK ERK5 mediates growth factor- and stress-induced intracellular signaling that controls proliferation or survival depending upon the cell context. In this study, we show that reducing ERK5 levels with a specific small hairpin RNA 5 (shERK5) reduced cell viability, sensitized cells to death receptor-induced apoptosis, and blocked the palliative effects of phorbol ester in anti-Fas Ab-treated cells. shERK5 decreased nuclear accumulation of the NF-kappaB p65 subunit, and conversely, ectopic activation of ERK5 led to constitutive nuclear localization of p65 and increased its ability to trans activate specific reporter genes. Finally, the T lymphoma cell line EL-4, upon expression of shERK5, proliferated in vitro, but failed to induce s.c. tumors in mice. Our results suggest that ERK5 is essential for survival of leukemic T cells in vivo, and thus represents a promising target for therapeutic intervention in this type of malignancy.
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Submitted on : Friday, August 2, 2019 - 3:19:00 PM
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J. Garaude, S. Cherni, S. Kaminski, E. Delepine, C. Chable-Bessia, et al.. ERK5 activates NF-kappaB in leukemic T cells and is essential for their growth in vivo. Journal of Immunology, Publisher : Baltimore : Williams & Wilkins, c1950-. Latest Publisher : Bethesda, MD : American Association of Immunologists, 2006, 177 (11), pp.7607--17. ⟨hal-02262459⟩

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