DRα1-MOG: A Novel Immunomodulatory Therapeutic for Stroke

这是一项研究新型免疫调节剂Drα1-mog临床前疗效的I期试验。 临床相关的小鼠血栓栓塞性卒中模型。我们之前已经证明T细胞被激活 卒中后，可渗入脑内，加重缺血性脑损伤。减少T细胞活化的策略和 脑组织渗透已被研究为中风的潜在治疗策略；然而，非 对T细胞功能的特异性抑制是免疫抑制。因此，我们开发了重组T细胞受体 (TcR)配体(RTL)，是由共价连接的β1和α1链组成的部分MHC II分子 拴在抗原肽上。早期RTL构建成功地保护了缺血诱导的 脑损伤，但仅当RTL包含神经抗原肽和匹配的II类MHC部分时 收件人。使用这些早期RTL构造来治疗人类中风的一个显著限制是需要快速 将受体MHC II类与pMHC构建体的β1结构域进行匹配。因此，我们设计了一部小说 人白细胞抗原-DRα1结构域与MOG-35-55多肽相连的重组蛋白(DRα1-MOG) 在pMHC中发现的β1结构域。因为DRα1结构域存在于所有人类中，不会被识别 与国外一样，使用DRHLA1构建的治疗不需要对潜在的接受者进行α筛查。在证明中 在原理研究中，我们证明了α1-mog博士每天四次治疗可显著减少梗塞面积。 在小鼠中风后。然而，这项研究是使用大脑中动脉腔内闭塞进行的。 (MCAO)模型，它导致机械性而不是血栓栓塞性闭塞，这是最常见的 人类中风。为了更真实地模拟临床中风，我们开发了一种新的血栓栓塞术模型。 鼠标笔划，这将构成当前提案的基础。此外，衰老和生物性行为也很好 记录中风结局的关键决定因素，部分是通过对中风诱发的不同影响来实现的 炎症反应。建议的STTR值将进一步表征DRα1-MOG的保护效果 卒中的临床相关血栓栓塞术模型和临床上重要的初始时间变量 治疗，性别和年龄，以估计DRα1-MOG可以在多大程度上用于治疗中风患者。

This is a Phase I STTR to investigate the preclinical efficacy of a novel immunomodulator, DRα1-MOG, in a clinically relevant thromboembolic stroke model in mice. We have previously shown that T cells are activated after stroke, infiltrate brain, and exacerbate ischemic brain damage. Strategies that reduce T cell activation and brain tissue infiltration have been investigated as potential therapeutic strategies for stroke; however, non- specific inhibition of T cell function is immunosuppressive. We therefore developed Recombinant T cell receptor (TCR) Ligands (RTLs), which are partial MHC II molecules comprised of covalently linked β1 and α1 chains tethered to antigenic peptides. Early RTL constructs were successful in protecting against ischemia-induced brain injury but only if the RTL contains a neuroantigen peptide and the matched Class II MHC moiety of the recipient. A significant limitation for using these early RTL constructs to treat human stroke is the need to rapidly match recipient MHC class II with the β1 domain of the pMHC construct. We, therefore, designed a novel recombinant protein comprised of the HLA-DRα1 domain linked to MOG-35-55 peptide (DRα1-MOG) but lacking the β1 domain found in pMHC. Because the DRα1 domain is present in all humans and would not be recognized as foreign, treatment using DRα1 constructs would not require HLA screening of potential recipients. In a proof of principle study, we demonstrated that four daily treatments with DRα1-MOG significantly reduced infarct size after stroke in mice. That study, however, was conducted using the intraluminal middle cerebral artery occlusion (MCAO) model, which causes mechanical, rather than thromboembolic occlusion, the most common cause of human stroke. To more faithfully mimic clinical stroke, we have developed a novel thromboembolic model of stroke in mouse, which will form the basis of the current proposal. Furthermore, aging and biological sex are well documented key determinants of stroke outcome, in part by exerting differential influences on stroke-induced inflammatory response. The proposed STTR will further characterize the protective effect of DRα1-MOG using the clinically relevant thromboembolic model of stroke, and the clinically important variables of time of initial treatment, sex and age to estimate how broadly DRα1-MOG could be used to treat stroke patients.