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International Immunology Advance Access originally published online on November 14, 2006
International Immunology 2006 18(12):1749-1757; doi:10.1093/intimm/dxl109
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© The Japanese Society for Immunology. 2006. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

TLR-dependent Bim phosphorylation in macrophages is mediated by ERK and is connected to proteasomal degradation of the protein

Georg Häcker1, Kathrin Suttner1, Hisashi Harada2 and Susanne Kirschnek1

1 Institute for Medical Microbiology, Immunology and Hygiene, Technical University Munich, Trogerstrasse 30, D-81675 Munich, Germany
2 Department of Internal Medicine, Massey Cancer Center, Virginia Commonwealth University, Richmond, VA 23298, USA

Correspondence to: S. Kirschnek; E-mail: susanne.kirschnek{at}lrz.tum.de

The pro-apoptotic Bcl-2 homology domain 3-only protein Bim has been shown to play an important role in immune cell homeostasis and various forms of apoptosis in the immune system. Bim is expressed in most immune cells, and regulation of Bim activity can occur on both transcriptional and post-translational levels. Toll-like receptor (TLR) stimulation has previously been shown to increase Bim expression and to cause Bim phosphorylation in the absence of apoptosis in mouse macrophages. Here we identify extracellular signal-regulated kinase as the major kinase responsible for TLR-dependent Bim phosphorylation. Three TLR-dependent serine phosphorylation sites, S55, S65 and S100, on mouse Bim were identified, two of them unique to the splice form BimEL and one also present on BimL. A Bim mutant defective in these three phosphorylation sites showed slightly enhanced pro-apoptotic activity, which might indicate a protective effect of Bim phosphorylation in this system. Phosphorylation did not alter the association of Bim protein with the microtubule cytoskeleton. However, TLR-mediated phosphorylation led to accelerated degradation of Bim via the proteasome. Thus, TLR stimulation of macrophages can regulate Bim levels in opposing ways, namely by transcriptional induction and by phosphorylation-dependent degradation of the protein.

Keywords: apoptosis, Bcl-2 family

Transmitting editor: D. Wallach


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