Abstract:
:Nakajo-Nishimura syndrome (NNS) is an immunoproteasome-associated autoinflammatory disorder caused by a mutation of the PSMB8 gene. Although dysfunction of the immunoproteasome causes various cellular stresses attributed to the overproduction of inflammatory cytokines and chemokines in NNS, the underlying mechanisms of the autoinflammation are still largely unknown. To investigate and understand the mechanisms and signal pathways in NNS, we established a panel of isogenic pluripotent stem cell (PSC) lines with PSMB8 mutation. Activity of the immunoproteasome in PSMB8-mutant PSC-derived myeloid cell lines (MT-MLs) was reduced even without stimulation compared with non-mutant-MLs. In addition, MT-MLs showed an overproduction of inflammatory cytokines and chemokines, with elevated reactive oxygen species (ROS) and phosphorylated p38 MAPK levels. Treatment with p38 MAPK inhibitor and antioxidants decreased the abnormal production of cytokines and chemokines. The current PSC model revealed a specific ROS-mediated inflammatory pathway, providing a platform for the discovery of alternative therapeutic options for NNS and related immunoproteasome disorders.
journal_name
Stem Cell Reportsjournal_title
Stem cell reportsauthors
Honda-Ozaki F,Terashima M,Niwa A,Saiki N,Kawasaki Y,Ito H,Hotta A,Nagahashi A,Igura K,Asaka I,Li HL,Yanagimachi M,Furukawa F,Kanazawa N,Nakahata T,Saito MKdoi
10.1016/j.stemcr.2018.04.004subject
Has Abstractpub_date
2018-06-05 00:00:00pages
1835-1850issue
6issn
2213-6711pii
S2213-6711(18)30172-3journal_volume
10pub_type
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