Oligodendrocyte development and myelinogenesis are not impaired by high concentrations of phenylalanine or its metabolites.

Oligodendrocyte development and myelinogenesis are not impaired by high concentrations of phenylalanine or its metabolites.
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高浓度的苯丙氨酸或其代谢产物不会损害少突胶质细胞的发育和骨髓生成。

DOI:
10.1007/s10545-010-9052-3
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发表时间:
2010-04
影响因子:
4.2
通讯作者:
Bours, Vincent
Bours, Vincent
中科院分区:
医学2区
文献类型:
--
作者:
Schoemans, Renaud;Aigrot, Marie-Stephane;Wu, Chaohong;Maree, Raphael;Hong, Pengyu;Belachew, Shibeshi;Josse, Claire;Lubetzki, Catherine;Bours, Vincent

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苯丙酮尿症(PKU)是一种代谢遗传病,其特征是苯丙氨酸羟化酶(PAH)酶活性缺陷。据报道,未经治疗的患者存在脑髓鞘发育不良,但其机制仍不清楚。因此,我们研究了苯丙氨酸 (Phe)、苯丙酮酸 (PP) 和苯乙酸 (PA) 对少突胶质细胞的影响。我们首先在 PKU 小鼠模型中证明,胼胝体切片中少突胶质细胞的数量与成年突变体或对照大脑没有差异。然后,使用富集的少突胶质细胞培养物,我们检测到高浓度的 Phe、PP 或 PA 没有细胞毒性作用。最后,我们使用基于髓鞘碱性蛋白(MBP)启动子激活的体外髓鞘形成指数,以及通过光学测量和生物信息学方法直接定量髓鞘,分析了 Phe、PP 和 PA 对有髓鞘共培养物中髓鞘形成过程的影响。这些参数均不受 Phe 或其衍生物水平增加的影响。总而言之,我们的数据表明,高水平的 Phe(例如 PKU 中的 Phe)不太可能直接诱发大脑髓鞘形成不足,这表明在这种髓鞘形成缺陷中存在其他机制。
Phenylketonuria (PKU) is a metabolic genetic disease characterized by deficient phenylalanine hydroxylase (PAH) enzymatic activity. Brain hypomyelination has been reported in untreated patients, but its mechanism remains unclear. We therefore investigated the influence of phenylalanine (Phe), phenylpyruvate (PP), and phenylacetate (PA) on oligodendrocytes. We fisrt showed in a mouse model of PKU that the number of oligodendrocytes is not different in corpus callosum sections from adult mutants or from control brains. Then, using enriched oligodendroglial cultures, we detected no cytotoxic effect of high concentrations of Phe, PP, or PA. Finally, we analyzed the impact of Phe, PP, and PA on the myelination process in myelinating cocultures using both an in vitro index of myelination, based on activation of the myelin basic protein (MBP) promoter, and the direct quantification of myelin sheaths by both optical measurement and a bioinformatics method. None of these parameters was affected by the increased levels of Phe or its derivatives. Taken together, our data demonstrate that high levels of Phe, such as in PKU, are unlikely to directly induce brain hypomyelination, suggesting involvement of alternative mechanisms in this myelination defect.
DOI: 10.1002/humu.10198
发表时间: 2003-04-01
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