Identification of novel small molecules for CNS myelin repair

描述（由申请人提供）：轴突的髓鞘形成对于脊椎动物中枢神经系统（CNS）的正常功能至关重要，并且是一个多步骤过程，需要少突胶质细胞前体细胞（OPC）识别靶轴突并分化为髓鞘形成细胞。虽然髓鞘形成主要发生在出生后的早期，但在成人CNS中，髓鞘形成可响应脱髓鞘损伤而重新启动。然而，这种髓鞘再生过程在脱髓鞘疾病如多发性硬化症中是有限的，部分原因是OPCs不能分化成成熟的少突胶质细胞。由于髓鞘再生促进轴突存活和功能恢复，如何诱导OPCs分化为髓鞘形成细胞是实现髓鞘修复和功能恢复的关键步骤。目前，还没有旨在促进髓鞘修复的临床治疗。因此，本提案的目标是鉴定促进OPCs分化为髓鞘形成细胞的小分子。我们将采用我们实验室最近建立的一种新的CNS髓鞘形成培养系统来筛选由20万种药物样化合物组成的化学库。为了实现少突胶质细胞成熟的高通量和直接可视化，我们将使用来自我们新产生的转基因小鼠的培养物，其中膜锚定增强型绿色荧光蛋白选择性地在髓鞘和成熟的少突胶质细胞中表达。通过化学筛选鉴定的先导化合物将在培养物中测试其促进OPCs进入髓鞘形成细胞和脱髓鞘动物模型的功效。这项拟议的研究有可能导致开发新的治疗干预措施，旨在促进髓鞘再生和功能恢复。

DESCRIPTION (provided by applicant): Myelination of axons is essential for the normal function of the vertebrate central nervous system (CNS), and is a multi-step process that requires oligodendrocyte precursor cells (OPCs) to recognize target axons and differentiate into myelinating cells. Although myelination occurs primarily in early postnatal life, it can be re- initiated in adult CNS in response to demyelinating injury. This remyelination process is, however, limited in demyelinating diseases such as multiple sclerosis, in part due to the failure of OPCs to differentiate into mature oligodendrocytes. As remyelination promotes axonal survival and functional recovery, how to coax OPCs to differentiate into myelinating cells represents a critical step in achieving myelin repair and functional recovery. Currently, there is no clinic therapy aimed at promoting myelin repair. Thus, the goal of this proposal is to identify small molecules that promote OPCs to differentiate into myelinating cells. We will employ a novel CNS myelinating culture system recently established in our laboratory to screen a chemical library consisting of 200,000-drug-like compounds. To achieve high throughput and direct visualization of oligodendrocyte maturation, we will use cultures derived from our newly generated transgenic mice where membrane-anchored enhanced green fluorescence protein is selectively expressed in myelin sheaths and mature oligodendrocytes. Lead compounds identified by chemical screening will then be tested in culture for their efficacy in promoting OPCs into myelinating cells and in an animal model of demyelination. This proposed study has the potential to lead to the development of novel therapeutic interventions aimed at promoting myelin regeneration and functional recovery.