J Lipid Res:高脂饮食和病毒引发的肠道炎症的机理相同

2017-06-22 MedSci MedSci原创

加州大学洛杉矶分校的科学家的一项新研究发现,当小鼠吃高脂肪饮食时,小肠中细胞的反应和病毒感染的反应一样,它们会产生某些免疫分子,并导致全身炎症。科学家们还发现,给小鼠喂食含有类似高密度脂蛋白或"有益胆固醇"的西红柿,同时给予普通的胆固醇药物Ezetimibe,炎症得以逆转。研究结果可能会带来新的药物类型,靶向肠道细胞,以减少人们心脏病发作和中风的风险,或者治疗与炎症有关的其他疾病,包括癌症和炎症性

加州大学洛杉矶分校的科学家的一项新研究发现,当小鼠吃高脂肪饮食时,小肠中细胞的反应和病毒感染的反应一样,它们会产生某些免疫分子,并导致全身炎症。科学家们还发现,给小鼠喂食含有类似高密度脂蛋白或"有益胆固醇"的西红柿,同时给予普通的胆固醇药物Ezetimibe,炎症得以逆转。

研究结果可能会带来新的药物类型,靶向肠道细胞,以减少人们心脏病发作和中风的风险,或者治疗与炎症有关的其他疾病,包括癌症和炎症性肠病

研究人员已经知道,长时间的肥胖会导致肝脏和脂肪组织的炎症,而这种炎症会导致糖尿病和心脏病的发生。研究还表明高水平的高密度脂蛋白和胆固醇能降低人患心脏病的风险。

加州大学洛杉矶分校研究小组,先前在大卫·杰芬医学院医学系主任艾伦·福格尔曼(Alan Fogelman)的带领下,开发了含有6F的转基因番茄,6F是一种类似于高密度脂蛋白中主要蛋白的蛋白质。在对6F的早期实验中,他们发现该化合物在小鼠小肠中有活性,并可以降低炎症。但具体是如何做到的还不清楚。

科学家们分别给小鼠喂食标准的食物和高脂肪、高胆固醇的西方食物。之后用含有6F的西红柿浓缩液、Ezetimibe或两者的混合物对一些小鼠进行了治疗。两周后,收集小鼠小肠的细胞,采集血样。测量肠内和体液中的胆固醇水平以及炎症和免疫分子的水平。

这些发现揭示了高脂饮食如何在体内引起炎症的分子细节,即肠道激活了通常由病毒引发的途径。这意味着阻断这种免疫反应--如6F和Ezetimibe--可以治疗炎症性疾病,并降低人们心脏病发作和中风的风险。

这项研究于2017年6月7日发表在《脂质研究》杂志上。

原文出处: Pallavi Mukherjee et al. Transgenic Tomatoes Expressing the 6F Peptide and Ezetimibe Prevent Diet-induced Increases of Interferon-β and Cholesterol 25-hydroxylase in Jejunum, Journal of Lipid Research (2017).

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    2017-12-18 bettycmoon
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    2017-06-24 pcw111
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    2017-06-23 184****9840

    学习了谢谢分享

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    2017-06-22 1e1a50a1m36(暂无匿称)

    长时间的肥胖会导致肝脏和脂肪组织的炎症

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近日,刊登在国际杂志PNAS上的一篇研究论文中,来自索尔克研究所的研究人员通过研究揭示了一种长寿激素如何帮助出生时线粒体发生多种突变的小鼠在其年轻时候维持机体代谢的自我平衡,相关研究或为开发治疗人类线粒体及代谢疾病相关的新型疗法提供帮助。 研究者Ronald Evans教授指出,本文研究或可帮助我们理解饮食、健康及机体老化之间的关系,同时也为我们分析这三者之间的关联来开发治疗人类代谢疾病的疗

Brain Behav Immun:小心!经常吃高脂肪食物会损害你的大脑

这项前后交叉随机对照试验发表在Brain, Behavior and Immunity,表明高脂饮食破坏神经元之间的突触连接和海马区脑细胞,可能会影响学习和记忆。

Cell Metabolism封面:两篇文章教你科学减肥

Salk生物研究所的科学家们发现,限制进食8-12小时比时不时吃点东西要好得多。这种限时进食(time-restricted eating)能影响肠道菌的平衡,有助于预防甚至逆转肥胖症和二型糖尿病。就算周末偶尔“放纵”一下,也不会抵消限时进食带来的好处。这一成果以两篇文章的形式发表在本期的Cell Metabolism杂志上,文章的通讯作者是Dr. Satchidananda Panda。