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Mol Metab:研究发现肝脏中的一种酶是导致脂肪肝疾病与胰岛素抵抗的重要推手!

2017-08-26 sunshine2015 来宝网

在饲喂高脂肪饮食的小鼠中,肝脏酶DPP4的增加促进身体脂肪的增加,脂肪肝疾病和胰岛素抵抗的发展。这些是DZD研究人员在波茨坦和图宾根的研究结果。



在肝脏中产生的酶促进肥胖、脂肪肝疾病和胰岛素抵抗】在饲喂高脂肪饮食的小鼠中,肝脏酶DPP4的增加促进身体脂肪的增加,脂肪肝疾病和胰岛素抵抗的发展。这些是DZD研究人员在波茨坦和图宾根的研究结果。

研究主管AnnetteSchürmann说:“结合我们来自额外的人和细胞研究的观察结果,这些结果表明,肝脏DPP4产生增加是造成脂肪肝和胰岛素抵抗的原因,而不是脂肪肝和胰岛素抵抗的后果。研究小组现已发表他们在分子代谢方面的发现。

“DPP4抑制剂从治疗糖尿病中是众所周知的,因此,我们认为,它们可以用于未来,不仅可以改善糖代谢,还可用于治疗非酒精性脂肪性肝病。”

DPP4是在很大程度上由肝脏产生的酶,其抑制参与血糖代谢的重要肠激素的作用。此外,患有非酒精性脂肪性肝病的患者血液中DPP4水平升高。然而,迄今为止,尚不清楚脂肪肝中DPP4水平升高是否是疾病的原因或结果。

为了找到这个问题的答案,与Schürmann和Baumeier合作的科学家将两组不同的小鼠相互比较。虽然一组小鼠由于遗传修饰而在肝脏中产生增加的DPP4的量,但是对照组显示出低量的酶。两组均给予相同的高脂肪饲料约6个月。在肝脏中产生DPP4量增加的动物比对照组获得了大约三分之一以上的脂肪,并且显示为肝脏脂肪的两倍。他们也对胰岛素反应较差。关于人肝细胞系以及小鼠分离的肝细胞的另外的研究也表明,正常量的DPP4(500ng / ml)足以使细胞对胰岛素的敏感程度低于其脂肪含量。此外,科学家们观察到,患有胰岛素抵抗和非酒精性脂肪性肝病的人在血液中的活性DPP4比健康人多。

Baumeier说:“从其他研究来看,我们知道DPP4基因的表观遗传修饰与酶的生成量增加有关,在脂肪性肝病出现之前,对年轻小鼠的肝脏代谢有负面影响。

DIFE实验糖尿病司司长Schürmann补充说,“进一步研究中DPP4抑制剂可以用于预防或治疗非酒精性脂肪肝的发展似乎是合理的。”

原始出处:

Christian Baumeier et al, Elevated hepatic DPP4 activity promotes insulin resistance and non-alcoholic fatty liver disease, Molecular Metabolism (2017). DOI: 10.1016/j.molmet.2017.07.016.

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    2017-12-01 guojianrong
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    2018-07-21 baoya
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    2018-05-11 一闲
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    2017-08-30 游手好闲

    学习了

    0

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    2017-08-26 thlabcde

    好东西学习了!

    0

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    2017-08-26 Y—xianghai

    学习了新知识

    0

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    2017-08-26 1ddf0692m34(暂无匿称)

    学习了.涨知识

    0

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铁元素是人体必需的微量元素之一,是构成血红蛋白、参与氧化反应及细胞增殖的必需元素,它广泛参与重要的生命代谢过程。正常人体的含铁量为3~4g,男性平均约3.8g,女性平均约2.3g。人体内铁元素超过正常值会对人体造成危害,这种现象被称作"铁超负荷"。通常认为,血清铁蛋白浓度>300 ng/mL,转铁蛋白饱和度>45%时即可以诊断为铁超负荷。肝脏铁超负荷(IO)是输血治疗时的主要并发症。一般认为,其在

4大疾病领域基因疗法管线大盘点

自转基因技术于上世纪70年代问世以来,基因疗法就被视为解决许多疾病,尤其是遗传病的终极疗法。过去二三十年来基因工程领域取得了突飞猛进的发展,但是,将基因疗法应用到人身上的过程却并非一帆风顺。基因疗法的长期有效性和长期安全性是这一领域的主要瓶颈。 2017年对于基因疗法来说可能是里程碑的一年,美国FDA有望批准Spark公司voretigene neparvovec用于治疗由RPE65突变引起

Nature:研究揭示肝细胞再生新机制!

国际研究协作首次证明胆管细胞(上皮胆管细胞)在肝脏再生中的作用。研究结果对再生医学和抗击肝病具有重要意义。该团队的发现已发表在“自然”杂志上。

Nat Genet:科学家发现与肝纤维化有关的蛋白

近期,来自于悉尼Westmead医学研究所的研究团队在Nature子刊《Nature Genetics》发表文章,揭示了引发肝脏组织损伤的罪魁祸首,为肝病治疗带来新的启示。他们首次发现,干扰素λ3(INLF3)蛋白突变会导致肝纤维化。由Jacob George教授和Mohammed Eslam博士领导的国际研究小组之前已经证实,与肝纤维化有关联的常见基因变异位于染色体9号上的IFNL3和IFNL4

JCI Insights:新药URMC-099——脂肪肝、肝炎等肝脏疾病的强大“克星”!

科学家今天在JCI Insights杂志的一项研究报告中称,一种称为“URMC-099”的药物在饮食脂肪,糖和胆固醇高的动物中逆转肝脏炎症,损伤和疤痕。饮食是为了复制西方快餐饮食,重现人们发现的非酒精性脂肪肝病的特征。该药物耐受性良好,研究团队计划进一步测试,以将URMC-099转化为早期人体试验。

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