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J NEUROSCI:为什么糖尿病治疗药物会让人变胖?

2015-03-30 佚名 生物谷

近日,国际学术期刊the journal of neuroscience发表了美国科学家的一项最新研究进展,他们针对糖尿病治疗药物罗格列酮可导致体重增加这一副作用进行了相关研究,发现PPARγ在AgRP/NPY神经元中激活,AgRP表达增加是导致该副作用的主要原因。   PPARγ是临床治疗糖尿病开发糖尿病治疗药物的重要靶点,但靶向PPARγ开发的药物罗格列酮存在促进食物摄取,增

近日,国际学术期刊the journal of neuroscience发表了美国科学家的一项最新研究进展,他们针对糖尿病治疗药物罗格列酮可导致体重增加这一副作用进行了相关研究,发现PPARγ在AgRP/NPY神经元中激活,AgRP表达增加是导致该副作用的主要原因。
 
PPARγ是临床治疗糖尿病开发糖尿病治疗药物的重要靶点,但靶向PPARγ开发的药物罗格列酮存在促进食物摄取,增加体重等副作用。但目前对罗格列酮副作用的机制原因以及PPARγ在食欲方面的作用了解较少。为解决这些问题,研究人员选择了西伯利亚仓鼠和C57BL/6小鼠作为模型进行了如下几个方面的检测:(1)腹腔注射罗格列酮(PPARγ激动剂)或GW9662(PPARγ拮抗剂)以及第三脑室注射罗格列酮或GW9662是如何影响西伯利亚仓鼠进食行为的;(2)饥饿状态是否会促进西伯利亚仓鼠和C57BL/6小鼠AGRP和PPARγ mRNA表达;(3)腹腔注射罗格列酮能否增加AGRP和NPY表达;(4)腹腔注射PPARγ拮抗剂能够阻断饥饿诱导的AGRP和NPY表达增加;最终(5)通过腹腔注射的方法调节PPARγ表达能否影响血浆中gprelin的水平。
 
结果发现,通过第三脑室和腹腔注射罗格列酮会促进实验动物的食物囤积行为,增加其摄食量,而在第三脑室注射PPARγ拮抗剂能够改善这一行为,在两部位注射拮抗剂均会抑制饥饿诱导的进食行为。研究人员通过观察饥饿状态下两种实验动物发现饥饿会诱导AgRP表达增加,同时伴随下丘脑部位PPARγ在AgRP/NPY神经元细胞中的特异性表达增加,而罗格列酮会产生类似作用,通过PPARγ拮抗剂作用会抑制这一现象的发生。
 
因此,这项研究证明了PPARγ激活能够促进动物囤积食物,增加摄食量,同时也说明饥饿诱导的AgRP/NPY增加或许是一个PPARγ依赖性过程,对于控制摄食行为具有重要作用。

原始出处:

John T. Garretson, Brett J.W. Teubner, Kevin L. Grove, Almira Vazdarjanova, Vitaly Ryu, and Timothy J. Bartness.Peroxisome Proliferator-Activated Receptor γ Controls Ingestive Behavior, Agouti-Related Protein, and Neuropeptide Y mRNA in the Arcuate Hypothalamus[J].The Journal of Neuroscience, 18 March 2015, 35(11):4571-4581; doi:10.1523/JNEUROSCI.2129-14.2015

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    2015-04-11 x35042875

    AKI对心衰临床治疗意义重大,但依然需要研究检验其适用性

    0

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    2015-04-01 lsndxfj
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    2015-03-30 cd90

    有意思

    0

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