Clos M V, Pera M, Ratia M, Román S, Camps P, Muñoz-Torrero D, Colombo L, Salmona M, Badia A
Departamento de Farmacologia, de Terapèutica, i de Toxicologia, Instituto Neurociències, UAB, Barcelona, Spain.
J Mol Neurosci. 2006;30(1-2):89-90. doi: 10.1385/JMN:30:1:89.
Transmissible spongiform encephalopaties are caused by an extracellular surface protein, the scrapie prion protein (PrPsc), which is an aberrant form of normal and functional cellular PrP (PrPc). The pathological hallmarks of these diseases are the accumulation and deposition of PrPsc in the form of amyloid fibrils in the central nervous system (Tateishi et al., 1988), similar to amyloid-beta (Abeta) protein in Alzheimer's disease (AD). In some patients, Abeta and prion pathology can coexist (Hainfellner et al., 1998), and a common spatial pattern of protein deposition has been described (Armstrong et al., 2001). In addition, it is well-known that acetylcholinesterase (AChE) colocalizes with Abeta deposits of brains in AD patients and accelerates assembly of Abeta peptides through the peripheral site of the enzyme (Inestrosa et al., 1996). The aim of the present study was to analyze time course and concentration dependence of the AChE proaggregating effect on synthetic peptide-spanning residues 106-126 of human PrP (PrP106-126) and the reversion of this effect by different AChE inhibitors (AChEIs).
传染性海绵状脑病由一种细胞外表面蛋白即瘙痒病朊病毒蛋白(PrPsc)引起,它是正常功能性细胞朊蛋白(PrPc)的异常形式。这些疾病的病理特征是PrPsc以淀粉样原纤维的形式在中枢神经系统中积累和沉积(Tateishi等人,1988年),这与阿尔茨海默病(AD)中的β淀粉样蛋白(Abeta)相似。在一些患者中,Abeta和朊病毒病理可以共存(Hainfellner等人,1998年),并且已经描述了一种常见的蛋白质沉积空间模式(Armstrong等人,2001年)。此外,众所周知,乙酰胆碱酯酶(AChE)与AD患者大脑中的Abeta沉积物共定位,并通过该酶的外周位点加速Abeta肽的组装(Inestrosa等人,1996年)。本研究的目的是分析AChE对人PrP(PrP106 - 126)跨越残基106 - 126的合成肽的促聚集作用的时间进程和浓度依赖性,以及不同乙酰胆碱酯酶抑制剂(AChEIs)对这种作用的逆转。