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Oncogene. 2018 Apr;37(16):2122-2136. doi: 10.1038/s41388-017-0112-0. Epub 2018 Feb 2.

The oncogenic tyrosine kinase Lyn impairs the pro-apoptotic function of Bim.

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Université Côte d'Azur, INSERM, C3M, Nice, France.
CRCINA, UMR 1232 INSERM, Université de Nantes, Université d'Angers, Institut de Recherche en Santé-Université de Nantes, 8 Quai Moncousu - BP 70721, 44007, Nantes Cedex 1, France.
Institut de Cancérologie de l'Ouest, Bvd J Monod, Site René Gauducheau, 44805, Saint-Herblain, France.
Université Côte d'Azur, INSERM, C3M, Nice, France.


Phosphorylation of Ser/Thr residues is a well-established modulating mechanism of the pro-apoptotic function of the BH3-only protein Bim. However, nothing is known about the putative tyrosine phosphorylation of this Bcl-2 family member and its potential impact on Bim function and subsequent Bax/Bak-mediated cytochrome c release and apoptosis. As we have previously shown that the tyrosine kinase Lyn could behave as an anti-apoptotic molecule, we investigated whether this Src family member could directly regulate the pro-apoptotic function of Bim. In the present study, we show that Bim is phosphorylated onto tyrosine residues 92 and 161 by Lyn, which results in an inhibition of its pro-apoptotic function. Mechanistically, we show that Lyn-dependent tyrosine phosphorylation of Bim increases its interaction with anti-apoptotic members such as Bcl-xL, therefore limiting mitochondrial outer membrane permeabilization and subsequent apoptosis. Collectively, our data uncover one molecular mechanism through which the oncogenic tyrosine kinase Lyn negatively regulates the mitochondrial apoptotic pathway, which may contribute to the transformation and/or the chemotherapeutic resistance of cancer cells.

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