Abstract:
:Persistent activation of nuclear factor B (NF-κB) is very important in the modulation of macrophages cellular response to microbial infections. The deubiquitinase USP14, which is critical for ubiquitin-mediated proteasomal degradation of proteins, is known to be involved in cancer, neurological diseases, and aging. However, the mechanism by which USP14 regulates inflammation remains unclear. Here, we demonstrated that decreasing the deubiquitinase activity of USP14 resulted in reduced lipopolysaccharides (LPS)-mediated tumor necrosis factor-α (TNF-α) and interleukin (IL)-6 release in THP-1 and RAW264.7 cells. Meanwhile, USP14 knockdown by siRNA showed the same effects, with no cytotoxicity in THP-1 cells. Moreover, inhibiting the deubiquitinase activity of USP14 or USP14 knockdown resulted in decreased ERK1/2 and IκBα phosphorylation, increased amounts of the NF-κB inhibitor IκBα, and reduced NF-κB p65 transport from the cytoplasm into nucleus. These findings suggested that USP14 induces NF-κB activity and ERK1/2 phosphorylation triggered by microbial infection.
journal_name
Mol Cell Biochemjournal_title
Molecular and cellular biochemistryauthors
Liu N,Kong T,Chen X,Hu H,Gu H,Liu S,Chen X,Yang Q,Li A,Xiong X,Zhang Zdoi
10.1007/s11010-017-2978-0subject
Has Abstractpub_date
2017-07-01 00:00:00pages
87-96issue
1-2eissn
0300-8177issn
1573-4919pii
10.1007/s11010-017-2978-0journal_volume
431pub_type
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