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.
Eizirik, Decio L.
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Gurzov, Esteban N.;Ortis, Fernanda;Bakiri, Latifa;Wagner, Erwin F.;Eizirik, Decio L.

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细胞因子通过调节β细胞基因表达网络促进1型糖尿病(T1 D)胰腺β细胞凋亡。转录因子激活蛋白-1(AP-1)是炎症和细胞凋亡的关键调节因子。目前,我们评估了AP-1亚基JunB在精氨酸介导的β细胞功能障碍和死亡中的功能。细胞因子IL-1β+IFN-γ通过激活NF-κB诱导JunB的早期和短暂上调。通过RNA干扰敲低JunB增加了精氨酸介导的诱导型一氧化氮合酶(iNOS)和内质网(ER)应激标志物的表达,导致胰岛素产生细胞系(INS-1 E)和纯化的大鼠原代β细胞凋亡增加。JunB敲除的β细胞和JunB−/−成纤维细胞对化学ER应激因子环匹阿尼酸(CPA)也更敏感。相反,腺病毒介导的JunB过表达减少了iNOS和ER标记物的表达,并保护β细胞免受奎宁诱导的细胞死亡。这些发现证明了JunB作为细胞因子和ER应激介导的细胞凋亡的防御机制的调节剂的一种新的和意想不到的作用。
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.
DOI: 10.1042/bst0360321
发表时间: 2008-06-01
影响因子: 3.9
作者:
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