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Bitzer, A.* ; Basler, M.* ; Krappmann, D. ; Groettrup, M.*

Immunoproteasome subunit deficiency has no influence on the canonical pathway of NF-κB activation.

Mol. Immunol. 83, 147-153 (2017)

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Open Access Green as soon as Postprint is submitted to ZB.

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Activation of the pro-inflammatory transcription factor NF-κB requires signal-induced proteasomal degradation of the inhibitor of NF-κB (IκB) in order to allow nuclear translocation. Most cell types are capable of expressing two types of 20S proteasome core particles, the constitutive proteasome and immunoproteasome. Inducible under inflammatory conditions, the immunoproteasome is mainly characterized through an altered cleavage specificity compared to the constitutive proteasome. However, the question whether immunoproteasome subunits affect NF-κB signal transduction differently from constitutive subunits is still up for debate. To study the effect of immunoproteasomes on LPS- or TNF-α-induced NF-κB activation, we used IFN-γ stimulated peritoneal macrophages and mouse embryonic fibroblasts derived from mice deficient for the immunoproteasome subunits low molecular mass polypeptide (LMP) 2, or LMP7 and multicatalytic endopeptidase complex-like 1 (MECL-1). Along the canonical signaling pathway of NF-κB activation no differences in the extent and kinetic of IκB degradation were observed. Neither the nuclear translocation and DNA binding of NF-κB nor the production of the NF-κB dependent cytokines TNF-α, IL-6, and IL-10 differed between immunoproteasome deficient and proficient cells. Hence, we conclude that immunoproteasome subunits have no specialized function for canonical NF-κB activation.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Immunoproteasome ; Inflammation ; Lmp2 ; Lmp7 ; Nf-κb

ISSN (print) / ISBN 0161-5890

e-ISSN 1872-9142

Journal Molecular Immunology

Quellenangaben Volume: 83, Pages: 147-153

Publisher Elsevier

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Research Unit Signaling and Translation (SAT)