JunB Inhibits ER Stress and Apoptosis in Pancreatic Beta Cells.
JunB Inhibits ER Stress and Apoptosis in Pancreatic Beta Cells.
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DOI:
10.1371/journal.pone.0003030
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发表时间:
2008-08-21
期刊:
影响因子:
3.7
通讯作者:
Eizirik, Decio L.
中科院分区:
文献类型:
--
作者:
Gurzov, Esteban N.;Ortis, Fernanda;Bakiri, Latifa;Wagner, Erwin F.;Eizirik, Decio L.
Cytokines contribute to pancreatic β-cell apoptosis in type 1 diabetes (T1D) by modulation of β-cell gene expression networks. The transcription factor Activator Protein-1 (AP-1) is a key regulator of inflammation and apoptosis. We presently evaluated the function of the AP-1 subunit JunB in cytokine-mediated β-cell dysfunction and death. The cytokines IL-1β+IFN-γ induced an early and transitory upregulation of JunB by NF-κB activation. Knockdown of JunB by RNA interference increased cytokine-mediated expression of inducible nitric oxide synthase (iNOS) and endoplasmic reticulum (ER) stress markers, leading to increased apoptosis in an insulin-producing cell line (INS-1E) and in purified rat primary β-cells. JunB knockdown β-cells and junB−/− fibroblasts were also more sensitive to the chemical ER stressor cyclopiazonic acid (CPA). Conversely, adenoviral-mediated overexpression of JunB diminished iNOS and ER markers expression and protected β-cells from cytokine-induced cell death. These findings demonstrate a novel and unexpected role for JunB as a regulator of defense mechanisms against cytokine- and ER stress-mediated apoptosis.
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影响因子:
3.9
作者:
Eizirik, Decio L.;Moore, Fabrice;Ortis, Fernanda
通讯作者:
Ortis, Fernanda
影响因子:
8
作者:
Gurzov, E. N.;Bakiri, L.;Izquierdo, M.
通讯作者:
Izquierdo, M.
影响因子:
15.9
作者:
Hoorens, A;VandeCasteele, M;Pipeleers, D
通讯作者:
Pipeleers, D
DOI:
10.1073/pnas.211445998
发表时间:
2001-10-09
影响因子:
11.1
作者:
Karlsen, AE;Ronn, SG;Billestrup, N
通讯作者:
Billestrup, N
影响因子:
3.9
作者:
Lenzen, Sigurd
通讯作者:
Lenzen, Sigurd