双功能铁螯合剂的设计与评价及其对保护多巴胺能神经元免受毒物损伤的作用。
Design and evaluation of bi-functional iron chelators for protection of dopaminergic neurons from toxicants.
机构信息
In Vitro Toxicology and Biomedicine, Department Inaugurated By the Doerenkamp-Zbinden Foundation, University of Konstanz, 78457, Konstanz, Germany.
Roche Pharma Research and Early Development, Roche Innovation Center Basel, Grenzacherstrasse, 4070, Basel, Switzerland.
出版信息
Arch Toxicol. 2020 Sep;94(9):3105-3123. doi: 10.1007/s00204-020-02826-y. Epub 2020 Jun 30.
While the etiology of non-familial Parkinson's disease (PD) remains unclear, there is evidence that increased levels of tissue iron may be a contributing factor. Moreover, exposure to some environmental toxicants is considered an additional risk factor. Therefore, brain-targeted iron chelators are of interest as antidotes for poisoning with dopaminergic toxicants, and as potential treatment of PD. We, therefore, designed a series of small molecules with high affinity for ferric iron and containing structural elements to allow their transport to the brain via the neutral amino acid transporter, LAT1 (SLC7A5). Five candidate molecules were synthesized and initially characterized for protection from ferroptosis in human neurons. The promising hydroxypyridinone SK4 was characterized further. Selective iron chelation within the physiological range of pH values and uptake by LAT1 were confirmed. Concentrations of 10-20 µM blocked neurite loss and cell demise triggered by the parkinsonian neurotoxicants, methyl-phenyl-pyridinium (MPP) and 6-hydroxydopamine (6-OHDA) in human dopaminergic neuronal cultures (LUHMES cells). Rescue was also observed when chelators were given after the toxicant. SK4 derivatives that either lacked LAT1 affinity or had reduced iron chelation potency showed altered activity in our assay panel, as expected. Thus, an iron chelator was developed that revealed neuroprotective properties, as assessed in several models. The data strongly support the role of iron in dopaminergic neurotoxicity and suggests further exploration of the proposed design strategy for improving brain iron chelation.
虽然非家族性帕金森病(PD)的病因尚不清楚,但有证据表明组织铁水平升高可能是一个促成因素。此外,接触某些环境毒物被认为是另一个风险因素。因此,脑靶向铁螯合剂作为多巴胺毒性中毒的解毒剂,以及作为潜在的 PD 治疗方法,引起了人们的兴趣。因此,我们设计了一系列对三价铁具有高亲和力的小分子,其中包含允许其通过中性氨基酸转运蛋白 LAT1(SLC7A5)转运到大脑的结构元件。合成了五个候选分子,并初步对其进行了保护人神经元免受铁死亡的特性分析。进一步对有前景的羟基吡啶酮 SK4 进行了表征。在生理 pH 值范围内选择性螯合铁并通过 LAT1 摄取得到了确认。浓度为 10-20µM 可阻断帕金森神经毒性剂甲基苯吡啶(MPP)和 6-羟基多巴胺(6-OHDA)在人多巴胺能神经元培养物(LUHMES 细胞)中引起的神经突损失和细胞死亡。当在毒性剂之后给予螯合剂时,也观察到了挽救作用。如预期的那样,既缺乏 LAT1 亲和力又降低铁螯合能力的 SK4 衍生物在我们的测定面板中表现出改变的活性。因此,开发了一种铁螯合剂,该螯合剂在几种模型中显示出神经保护特性。这些数据强烈支持铁在多巴胺能神经毒性中的作用,并表明进一步探索所提出的设计策略以改善脑铁螯合作用。