Cell Rep:研究确定非酒精性脂肪性肝病的诱发因素及治疗方法

2016-07-03 MedSci MedSci原创

除了改变生活方式和减轻体重外,目前还没有有效或安全的治疗非酒精性脂肪性肝病的方法。近日,来自俄亥俄州辛辛那提儿童医院医学中心的研究人员发现,小鼠模型和人类患者中CDK4的蛋白水平升高。此外,使用药物阻断小鼠体内的这种蛋白质时则可显著减少肝脏脂肪变性的发展,该研究已发表于Cell Reports。该研究的资深作者Nikolai Timchenko教授说道:“该研究首次表明CDK4引发非酒精性脂肪性肝

除了改变生活方式和减轻体重外,目前还没有有效或安全的治疗非酒精性脂肪性肝病的方法。近日,来自俄亥俄州辛辛那提儿童医院医学中心的研究人员发现,小鼠模型和人类患者中CDK4的蛋白水平升高。此外,使用药物阻断小鼠体内的这种蛋白质时则可显著减少肝脏脂肪变性的发展,该研究已发表于Cell Reports。

该研究的资深作者Nikolai Timchenko教授说道:“该研究首次表明CDK4引发非酒精性脂肪性肝病(NAFLD)的发生,抑制这种酶可预防并逆转该疾病发生的第一阶段。”

NAFLD是指多余脂肪在肝细胞中堆积,而其原因并非是饮酒。肝脏中含有一些脂肪是正常的,但如果所含的脂肪达到肝脏重量的5-10%,那么则被归类为脂肪肝。

NAFLD发展的第一阶段为肝脏脂肪变性,可进一步发展为非酒精性脂肪性肝炎(NASH),并最终发展为肝硬化或肝癌。

NAFLD往往发生在超重或肥胖的人群,或患有糖尿病、高胆固醇或高甘油三酯的人群。此外,NAFLD还可能是由于不良的饮食习惯和快速减肥所致。

然而,即使没有这些危险因素有些人也会发生非酒精性脂肪肝。据估计,约1/4的美国人存在NAFLD。

Timchenko教授表示,亟需新的安全有效的治疗措施来治疗NAFLD。目前,治疗这种疾病的唯一方法是减肥和改变生活方式。

他解释道,虽然目前正在进行临床试验的新的治疗方法已经显示出可喜的成果,但是也存在严重的副作用。


阻断CDK4可防止肝细胞脂肪变性

研究人员发现,NAFLD小鼠模型和人类患者中CDK4的蛋白水平较高。CDK4水平的升高可引发一连串的连锁反应,最终会导致肝细胞脂肪变性、纤维化和肝细胞癌(HCC或肝癌)。

另一部分研究中,研究人员发现阻断CDK4可扰乱通路并可预防小鼠肝细胞脂肪变性的发展,而通常情况下给予小鼠高脂喂食时则会诱导其肝细胞脂肪变性的发生。

此外,研究人员还发现,抑制脂肪变性小鼠的肝脏中的CDK4可逆转脂肪肝。研究中所使用的抑制剂为flavopiridol和PD-0332991。

最后,研究人员总结道,该研究的关键性发现在于确定了CDK4的升高或激活是NAFLD发生的一个关键步骤。他们认为,这一发现连同CDK4抑制剂或为使用CDK4抑制剂停止脂肪肝的进展甚至逆转已发生的脂肪变性提供强有力的证据。

Nikolai Timchenko教授最后说道,“我们测试的两种CDK4抑制剂都已经FDA批准,且已用于肝癌的临床试验中,因此,这两种抑制剂将很快进入到NAFLD的临床试验中。”

原始出处:

Catharine Paddock. Non-alcoholic fatty liver disease: Scientists identify trigger and treatment. MNT, 1 July 2016.

Jingling Jin et al.,Activation of CDK4 Triggers Development of Non-alcoholic Fatty Liver Disease, Cell Reports, doi:10.1016/j.celrep.2016.06.019, published online 30 June 2016.

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    2016-07-20 qjddjq
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