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Characterization of vinblastine-induced Bcl-xL and Bcl-2 phosphorylation: evidence for a novel protein kinase and a coordinated phosphorylation/dephosphorylation cycle associated with apoptosis induction

Oncogene volume 24, pages 107–117 (2005)Cite this article

Abstract

Bcl-xL and Bcl-2 are phosphorylated in response to microtubule inhibitors, but the kinase(s) responsible and the functional significance have remained unclear. In this study, we investigated the characteristics of Bcl-xL and Bcl-2 phosphorylation in KB-3 carcinoma cells treated with vinblastine. In both asynchronous and synchronous cell cultures, Bcl-xL and Bcl-2 underwent a well-defined and coordinated cycle of phosphorylation and dephosphorylation, with a lengthy period of phosphorylation preceding apoptosis induction, and with dephosphorylation closely correlated with initiation of apoptosis. Internally, validated inhibitors of JNK, ERK, p38MAPK, or CDK1 failed to inhibit vinblastine-induced phosphorylation of Bcl-xL or Bcl-2. In vitro, Bcl-xL and Bcl-2 were poor substrates relative to c-Jun and ATF2 for active recombinant JNK1. Both Bcl-xL and Bcl-2 were localized primarily to the mitochondrial fraction in both control and vinblastine-treated cells, indicating that phosphorylation did not promote subcellular redistribution. Bcl-xL kinase activity was demonstrated in mitochondrial extracts from vinblastine-treated, but not control, cells. These findings suggest that phosphorylation of these key antiapoptotic proteins may be catalysed by a novel or unsuspected kinase that is activated or induced in response to microtubule damage. Furthermore, the same kinase and phosphatase system may be operating in tandem on both proteins, and phosphorylation appears to maintain their antiapoptotic function, whereas dephosphorylation may trigger apoptosis. These results provide evidence for a novel signaling pathway connecting microtubule damage to apoptosis induction, and help to clarify some of the controversy concerning the role of Bcl-2 phosphorylation in microtubule inhibitor-induced apoptosis.

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Acknowledgements

This work was supported by National Institutes of Health Grants CA75577 and CA10982 from the National Cancer Institute and in part by a grant from the University of Arkansas for Medical Sciences Graduate Student Research Fund.

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  1. Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, AR, 72205, USA

    Lihua Du, Christopher S Lyle & Timothy C Chambers

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  1. Lihua Du
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Correspondence to Timothy C Chambers.

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Du, L., Lyle, C. & Chambers, T. Characterization of vinblastine-induced Bcl-xL and Bcl-2 phosphorylation: evidence for a novel protein kinase and a coordinated phosphorylation/dephosphorylation cycle associated with apoptosis induction. Oncogene 24, 107–117 (2005). https://doi.org/10.1038/sj.onc.1208189

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