EASD 2013:cereulide可损伤胰岛β细胞功能

2013-10-09 desperado—c DXY

1型糖尿病和2型糖尿病的患病率呈上升趋势,并且这种增加被认为与环境因素有关。食源性毒素能直接诱导β细胞功能紊乱和凋亡,可能部分解释这个预制食品和预包装食品时代糖尿病流行的原因。为了探讨cereulide[一种有蜡样芽孢杆菌特定菌株所产生的线粒体毒性肽,在米饭、意大利面和土豆餐中经常能发现低浓度cereulide(每克食物中大约含4ng cereulide)]对β细胞毒性,来自比利时公共卫生研究中心

1型糖尿病和2型糖尿病的患病率呈上升趋势,并且这种增加被认为与环境因素有关。食源性毒素能直接诱导β细胞功能紊乱和凋亡,可能部分解释这个预制食品和预包装食品时代糖尿病流行的原因。为了探讨cereulide[一种有蜡样芽孢杆菌特定菌株所产生的线粒体毒性肽,在米饭、意大利面和土豆餐中经常能发现低浓度cereulide(每克食物中大约含4ng cereulide)]对β细胞毒性,来自比利时公共卫生研究中心Roman Vangoitsenhoven教授及其团队进行了一项研究,该研究发现cereulide可损伤胰岛β细胞功能。该研究结果发表在2013年EASD会议上。【原文下载

该研究中,将小鼠和大鼠产胰岛素β细胞株(分别为MIN6和INS-1E)、以及人类肝细胞HepG2和猴成纤维细胞样COS细胞暴露于0.05ng/ml到5ng/ml浓度cereulide中24、48和72小时。由两位研究者在盲态下使用Hoechst/碘化丙啶分析法评估细胞死亡情况。从2周龄C57B1/6J小鼠分离完整鼠胰岛,暴露于相似浓度cereulide中1、3和5天,并使用相同的方法确定细胞死亡情况。为了评估导致细胞死亡的确切机制,将MIN6细胞暴露于低浓度cereulide(0.15-0.5ng/ml)中24小时,并通过mRNA表达谱和生物发光法分析caspase3/7活性评估cereulide毒性机制。最后,用低浓度cereulide(0.15-0.5ng/ml)处理MIN6细胞24小时后,通过分析MIN6细胞葡萄糖刺激胰岛素分泌评估β细胞功能。

该研究结果表明,cereulide暴露导致MIN6、INS-1E和胰腺胰岛细胞死亡,但不能导致HepG2或COS细胞死亡。caspase3/7激活证实凋亡细胞死亡过程(与对照组相比,0.25ng/ml cereulide诱导caspase3/7活性增加1.54±0.07倍)。有趣的是,0.25ng/ml cereulide暴露诱导线粒体应激指标(包括PUMA),以及内质网应激指标(例如CHOP)表达。暴露于0.25ng/ml cereulide 24小时后,葡萄糖刺激胰岛素分泌从10.48±3.33降至2.012±0.51。

该研究发现,cereulide,一种常在预制食品和预包装淀粉类食品中发现的毒素,即使在低剂量时也可增加大鼠和小鼠β细胞线粒体应激和内质网应激水平。Cereulide以剂量依赖性方式导致β细胞功能受损和凋亡。因此,Cereulide可能在当前糖尿病流行中发挥作用,尤其是亚洲糖尿病的急骤流行的原因。

原文下载

Foodborne cereulide causes beta cell dysfunction and apoptosis.pdf
 

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    2014-09-05 okhuali
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    2013-10-21 baoya
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    2013-10-11 qilu_qi
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