在阿尔茨海默氏症细胞模型中,素乙化促进了家庭静止的粉样蛋白降低通路
Daniel C Xu1, Hanna Sas-Nowosielska1, Greg Donahue1
1Department of Cell and Developmental Biology, Perelman School of Medicine Philadelphia, Penn Institute of Epigenetics, Philadelphia, PA, 19104, USA.
Acta neuropathologica communications
|January 3, 2024
概括
激素乙化,在阿尔茨海默氏症 (AD) 的一个关键的表观遗传标记,似乎激活保护基因. 在AD模型中减少这个标记意外地增加了有毒的粉样β分泌,这表明在AD中对乙化有补偿作用.
科学领域:
- 神经科学是一个神经科学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
背景情况:
- 阿尔茨海默病 (AD) 涉及认知衰退和大脑病理,表观遗传基因组蛋白修饰可能影响疾病进展.
- 基因组H3 lysine 27乙化 (H3K27ac) 是一个活跃的基因转录标记,在AD脑组织中被发现是升高的.
- 在AD病变发生过程中H3K27ac的作用,特别是在对粉样蛋白前体蛋白 (APP) 重复的反应中,需要进一步研究.
研究的目的:
- 在家族性阿尔茨海默氏病的细胞模型中,研究调节CBP/P300酶的功能影响,这些酶催化H3K27ac.
- 确定降低H3K27ac如何影响APP重复神经元中的恒常基因表达和粉样β物种的分泌.
主要方法:
- 利用来自家族AD患者的诱导多能干细胞衍生神经元 (iPSC神经元),这些神经元具有APP重复 (APPDup神经元).
- 操纵CBP/P300酶水平以改变APPDup神经元中的H3K27ac水平.
- 测量了家庭静态粉样蛋白降低基因的基因表达和测量了细胞外粉样蛋白-β (Aβ) 分泌,特别是Aβ1-42).
主要成果:
- 与对照人群相比,Dup神经元表现出同源性粉样蛋白降低基因的上调.
- 减少CBP/P300,从而导致H3K27ac导致这些补偿基因的表达减少.
- 降低H3K27ac导致有毒Aβ1-42物种在细胞外环境中的分泌量增加.
结论:
- 包括H3K27ac在内的表观基因组基因组乙化似乎驱动了补偿性遗传程序,以应对AD相关的侮辱,例如APP重复.
- 这些由乙化驱动的程序可能通过减轻AD病态来发挥神经保护作用.
- 针对像H3K27ac这样的表观遗传修饰,需要进一步研究潜在的阿尔茨海默病治疗策略.
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