Abstract:
:Peptidylprolyl cis/trans isomerase, NIMA-interacting 1 (PIN1) modulates phospho-signaling by catalyzing rotation of the bond between a phosphorylated serine or threonine before proline in proteins. As depletion of PIN1 increased inflammatory protein expression in cultured endothelial cells treated with bacterial endotoxin (lipopolysaccharide, LPS) and interferon-γ, we hypothesized that PIN1 knockout would increase sensitivity to LPS-induced lung inflammation in mice. Mortality due to a high dose of LPS (30mg/kg) was greater in knockout than wildtype mice. Lung myeloperoxidase activity, reflecting neutrophils, was increased to a 35% higher level in PIN1 knockout mouse lung, as compared with wildtype, after treatment with a sublethal dose of 3mgLPS/kg, ip. Unexpectedly, plasma tumor necrosis factor-α (TNF) was approximately 50% less than in wildtype mice. Knockout mice, however, were more sensitive than wildtype to TNF-induced neutrophil accumulation. The neutrophil adhesion molecule, E-selectin, was also elevated in lungs of knockout mice treated with TNF, suggesting that PIN1 depletion increases endothelial sensitivity to TNF. Indeed, TNF induced more reactive oxygen species in cultured endothelial cells depleted of PIN1 with short hairpin RNA than in control cells. Collectively, the results indicate that while PIN1 normally facilitates TNF production in LPS-treated mice, it suppresses pulmonary and endothelial reactions to the cytokine. Tissue or cell-specific effects of PIN1 may affect the overall inflammatory response to LPS and other stimuli.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Liu T,Schneider RA,Lee NY,Hoyt DGdoi
10.1016/j.bbrc.2014.08.089subject
Has Abstractpub_date
2014-09-26 00:00:00pages
468-72issue
3eissn
0006-291Xissn
1090-2104pii
S0006-291X(14)01512-5journal_volume
452pub_type
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