在小鼠β细胞中的NADPH氧化酶4参与慢性营养过载的炎症
Blanka Holendová1, Štěpánka Benáková1,2, Monika Křivonosková1,3
1Laboratory of Pancreatic Islet Research, Institute of Physiology of the Czech Academy of Sciences, Prague, Czech Republic.
Obesity (Silver Spring, Md.)
|December 12, 2023
概括
在胰腺β细胞中删除NADPH氧化酶4 (NOX4) 减少了高脂肪饮食的小鼠的炎症. 这表明NOX4是NOX4.
科学领域:
- 分子生物学分子生物学
- 代谢性疾病研究研究
- 炎症和免疫学 炎症和免疫学
背景情况:
- 胰腺β细胞中的氧化应激与代谢功能障碍有关.
- 在β细胞炎症中NADPH氧化酶异型4 (NOX4) 的作用尚未完全理解.
- 营养过多,例如高脂肪饮食 (HFD),可以触发导致糖尿病的炎症反应.
研究的目的:
- 在饮食诱导的代谢炎症的背景下,研究NOX4在胰腺β细胞中的作用.
- 为了确定是否删除β细胞中的NOX4会影响糖尿病炎症表型的发展.
- 阐明将β细胞的氧化还原状态与营养过量下的炎症联系在一起的机制.
主要方法:
- 产生β细胞特异的NOX4淘汰赛小鼠 (βNOX4-/-).
- 向高脂肪饮食 (HFD) 暴露的小鼠进行了代谢表型化 (胰岛素,葡萄糖水平,热量计).
- 在孤立的小岛和细胞培养物中,使用测定caspase-1活性,插白素-1β (IL-1β) 水平和NLRP3炎症酶活性来评估炎症.
主要成果:
- 在HFD的βNOX4-/-小鼠中,没有出现过高胰岛素血症或高血糖症,而是积累了脂质.
- 小鼠表现出显著减少的全身和局部小岛炎症.
- 在βNOX4-/-岛屿和NOX4-沉默细胞中观察到降低的IL-1β水平和NLRP3炎症酶活性,减弱了促炎性巨细胞两极分化.
结论:
- 在β细胞中NOX4的亲氧化活性在营养过载期间促进NLRP3炎症酶激活.
- 贝塔细胞NOX4有助于局部炎症信号,可能影响周围组织和糖尿病表型.
- 准β细胞NOX4可能是缓解饮食诱导的代谢炎症的治疗策略.
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