DOI: 10.1084/jem.189.11.1815. Dephosphorylation Targets Bcl-2 for Ubiquitin-dependent Degradation: A Link between the Apoptosome and the Proteasome Pathway

Dephosphorylation Targets Bcl-2 for Ubiquitin-dependent Degradation: A Link between the Apoptosome and the Proteasome Pathway

10.1084/jem.189.11.1815

Crossref journal-article

Rockefeller University Press

The Journal of Experimental Medicine (291)

Abstract

Injury of the endothelial cells by the induction of apoptotic cell death may play an important role in the pathophysiology of atherosclerosis and the progression of inflammatory diseases. Here, we demonstrate an essential role for the ubiquitin-dependent proteasome complex in stimulus-induced degradation of the antiapoptotic protein Bcl-2. Bcl-2 is specifically degraded after stimulation of human endothelial cells with tumor necrosis factor (TNF)-α in a process that is inhibited by specific proteasome inhibitors. In addition, the mutation of the potential ubiquitin-acceptor amino acids of Bcl-2 provides protection against TNF-α– and staurosporine-induced degradation in vitro and in vivo. Moreover, mimicking phosphorylation of the putative mitogen-activated protein (MAP) kinase sites of the Bcl-2 protein (Thr 56, Thr 74, and Ser 87) abolishes its degradation, suggesting a link between the MAP kinase pathway to the proteasome pathway. Finally, inhibition of Bcl-2 degradation either by suppressing ubiquitin-dependent proteasomal degradation or by mimicking continuous phosphorylation of the putative MAP kinase sites in the Bcl-2 protein confers resistance against induction of apoptosis. Thus, the degradation of Bcl-2 may unleash the inhibitory function of Bcl-2 over the apoptosome and may thereby amplify the activation of the caspase cascade.

Bibliography

Dimmeler, S., Breitschopf, K., Haendeler, J., & Zeiher, A. M. (1999). Dephosphorylation Targets Bcl-2 for Ubiquitin-dependent Degradation: A Link between the Apoptosome and the Proteasome Pathway. The Journal of Experimental Medicine, 189(11), 1815â1822.

Authors 4

Stefanie Dimmeler (first)
Kristin Breitschopf (additional)
Judith Haendeler (additional)
Andreas M. Zeiher (additional)

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 12:49 p.m.)
Deposited	2 years, 1 month ago (July 25, 2023, 5:35 a.m.)
Indexed	1 month, 2 weeks ago (July 14, 2025, 11:22 p.m.)
Issued	26 years, 2 months ago (June 7, 1999)
Published	26 years, 2 months ago (June 7, 1999)
Published Online	26 years, 2 months ago (June 7, 1999)
Published Print	26 years, 2 months ago (June 7, 1999)

Funders 0

None

BibTeX

@article{Dimmeler_1999, title={Dephosphorylation Targets Bcl-2 for Ubiquitin-dependent Degradation: A Link between the Apoptosome and the Proteasome Pathway}, volume={189}, ISSN={1540-9538}, url={http://dx.doi.org/10.1084/jem.189.11.1815}, DOI={10.1084/jem.189.11.1815}, number={11}, journal={The Journal of Experimental Medicine}, publisher={Rockefeller University Press}, author={Dimmeler, Stefanie and Breitschopf, Kristin and Haendeler, Judith and Zeiher, Andreas M.}, year={1999}, month=jun, pages={1815–1822} }

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