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Science:蓓萨罗丁在小鼠中如何抵抗阿尔茨海默症效应

2012-02-15 MedSci MedSci原创

近日,国际著名杂志《科学》Science在线刊登了国外研究人员的最新研究成果“ApoE-Directed Therapeutics Rapidly Clear β-Amyloid and Reverse Deficits in AD Mouse Models,”,文章中,作者揭示了药物在小鼠中是如何对抗阿尔茨海默症的。 研究人员报告,一种FDA批准的叫做蓓萨罗丁的药物可在小鼠模型中对抗阿尔茨海默

近日,国际著名杂志《科学》Science在线刊登了国外研究人员的最新研究成果“ApoE-Directed Therapeutics Rapidly Clear β-Amyloid and Reverse Deficits in AD Mouse Models,”,文章中,作者揭示了药物在小鼠中是如何对抗阿尔茨海默症的。

研究人员报告,一种FDA批准的叫做蓓萨罗丁的药物可在小鼠模型中对抗阿尔茨海默氏病的许多效应。 被称作β-淀粉样蛋白片段的积聚是该疾病的一个主要特征;每个人的脑都会产生β-淀粉样蛋白,但在健康人中,在一种叫做ApoE的蛋白的帮助下,酶会使这些片段分解。 Paige Cramer及其同事知道,蓓萨罗丁会激活一种蛋白,该蛋白可帮助启动ApoE基因;

他们推测,该药因而能够增进脑中β-淀粉样蛋白的清除。 他们给那些经过遗传工程设计而患有阿尔茨海默症样疾病的小鼠这种药物并观察到,小鼠脑中的该蛋白碎片浓度仅在几天内就有了显著的下降。 这些小鼠还显示了其认知、社交及嗅觉表现的改善。 文章的作者指出,蓓萨罗丁也被称作塔革雷汀,该药目前用于治疗某种形式的皮肤癌,它具有良好的安全特性。 该药会激活被称作RXR的核受体蛋白,该蛋白会与2种其它核受体——PPAR和LXR中的一种结合。 这些成对受体接着会激活ApoE基因的转录。

ApoE-Directed Therapeutics Rapidly Clear β-Amyloid and Reverse Deficits in AD Mouse Models

Paige E. Cramer1, John R. Cirrito2, Daniel W. Wesson1,3 , C. Y. Daniel Lee1, J. Colleen Karlo1, Adriana E. Zinn1, Brad T. Casali1, Jessica L. Restivo2, Whitney D. Goebel2, Michael J. James4, Kurt R. Brunden4, Donald A. Wilson3, Gary E. Landreth1,*

Alzheimer's disease is associated with impaired clearance of β-amyloid from the brain, a process normally facilitated by apolipoprotein E (ApoE). ApoE expression is transcriptionally induced through the action of the nuclear receptors peroxisome proliferator activated receptor (PPARγ) and liver X receptors (LXR) in coordination with retinoid X receptors (RXR). Oral administration of the RXR agonist, bexarotene, to a murine model of Alzheimer's disease resulted in enhanced clearance of soluble Aβ within hours in an apoE-dependent manner. Aβ plaque area was reduced >50% within just 72 hours. Furthermore, bexarotene stimulated the rapid reversal of cognitive, social, and olfactory deficits and improved neural circuit function. Thus, RXR activation stimulates physiological Aβ clearance mechanisms, resulting in the very rapid reversal of a broad range of Aβ-induced deficits.

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    2012-02-17 爆笑小医
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