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TGFβ-mediated apoptosis of Burkitt's lymphoma BL41 cells is associated with the relocation of mitochondrial BimEL

Abstract

In this study, we showed that the transforming growth factor β (TGFβ)-mediated apoptosis of Burkitt's lymphoma BL41 cells is dependent on the BH3-only protein Bim. In contrast to what has been observed with other cell types, TGFβ activation did not promote Bim upregulation in BL41 cells, but instead resulted in Bim release from the mitochondria. Indeed, Bim levels were high in healthy BL41 cells, in which they dimerized with the Bcl-2-like protein Mcl-1 at the mitochondrial surface. In healthy and TGFβ-activated BL41 cells, unlike in epithelial cells or hepatocytes, Bim did not associate with Bcl-2 or Bcl-xL. TGFβ activation of BL41 cells triggered the p38-dependent activation of caspase-8, causing the cleavage of Mcl-1 and the transfer of Bim from the mitochondria to the cytoskeleton. In addition to mitochondrial activation, this relocation of Bim may facilitate the complete demise of a cell death that is beyond the commitment point to apoptosis and may represent a hallmark of the TGFβ-mediated apoptosis of human lymphoma B cells.

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Acknowledgements

This work was supported by INSERM and grants from the Fondation de France, Association pour la Recherche sur le Cancer (ARC) and Agence Nationale de la Recherche (ANR). CC and BEM hold fellowships from Ministére de la Recherche, Fédération de la Recherche Médicale (FRM) and Société Française d'Hématologie, respectively. We thank Dr P Bouillet (The Walter and Eliza Hall Institute, Australia) for providing us with scrambled and Bim-shRNA.

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Correspondence to A Vazquez.

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Clybouw, C., E L Mchichi, B., Hadji, A. et al. TGFβ-mediated apoptosis of Burkitt's lymphoma BL41 cells is associated with the relocation of mitochondrial BimEL. Oncogene 27, 3446–3456 (2008). https://doi.org/10.1038/sj.onc.1211009

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