NANOFORMULATIONS OF REDOX ENZYMES FOR TREATMENT OF ISCHEMIC STROKE

这个子项目是许多研究子项目中的一个 由NIH/NCRR资助的中心赠款提供的资源。子项目和 研究者（PI）可能从另一个NIH来源获得了主要资金， 因此可在其他CRISP条目中表示。所列机构为 研究中心，而研究中心不一定是研究者所在的机构。 该提案的长期目标是开发自由基清除剂RedOx酶的脑递送系统，以减轻缺血性卒中患者的神经炎症并增加神经保护。中风的初步治疗包括清除阻塞和恢复血液流动。当急性期结束时，治疗重点是恢复脑功能和细胞存活。在这个阶段，将Redox酶输送到大脑以减少炎症非常重要。然而，血脑屏障（BBB）严重限制了治疗性多肽向脑的递送，并且是成功治疗许多破坏性中枢神经系统（CNS）疾病的主要障碍。为了改善治疗性多肽向脑的转运、保持酶活性并降低免疫原性，治疗性RedOx酶将与相反电荷的合成酶交联以形成稳定的聚离子复合物胶束“纳米酶”。我们假设1）酶掺入的纳米容器在生理条件下将是稳定的，2）将增强酶穿过体外BBB的渗透性，3）将增加体内循环时间和/或穿过BBB的渗透性，以及4）将改善体外脑缺氧和体内中风模型中的生物活性。具体目标是：1）组装RedOx纳米酶（SOD，过氧化氢酶），并定制组合物以增加稳定性、循环时间和/或穿过BBB的渗透性，2）确定在体外和体内SA 1中合成的纳米酶穿过脑微血管内皮细胞（BMVEC）的渗透性和转运机制，3）确定在SA 2中选择的最有前途的纳米酶是否可以在体外脑缺氧和体内中风模型中减轻神经炎症并提供神经保护。预计这些研究将提供一种新的平台，用于通过BBB递送治疗性蛋白质以进行再生治疗。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. The long-term objective of this proposal is to develop delivery system of free-radical scavengers, RedOx enzymes, to the brain to attenuate neuroinflammation and increase neuroprotection in patients with ischemic stroke. Initial treatment for stroke involves removing the blockage and restoring blood flow. When acute phase is over, the treatment focused on restoration of brain function and cell survival. At this stage, delivery of RedOx enzymes to the brain to decrease inflammation is of great importance. However, the blood brain barrier (BBB) severely limits the delivery of therapeutic polypeptides to the brain and is a major obstacle to the successful treatment of many devastating central nervous system (CNS) diseases. To improve the therapeutic polypeptide transport to the brain, preserve enzyme activity, and reduce immunogenecity, the therapeutic RedOx enzymes will be cross-linked with a synthetic polyelectrolyte of opposite charge to form a stable polyion complex micelle, "nanozyme". We hypothesize that 1) enzyme incorporated nanocontainers will be stable at physiological conditions, 2) will enhance permeability of the enzyme across the in vitro BBB, 3) will increase circulation time and/or permeability across the BBB in vivo, and 4) will improve biological activity in in vitro brain hypoxia and in vivo stroke models. Specific Aims are 1) to assemble RedOx nanozymes (SOD, catalase) and tailor the composition for increased stability, circulation time and/or permeability across the BBB, 2) to determine permeability and transport mechanisms of the nanozymes synthesized in SA1 across the brain microvascular endothelial cells (BMVEC) in vitro and in vivo, 3) to determine whether the most promising nanozymes selected in SA2 can attenuate neuroinflammation and provide neuroprotection in an in vitro brain hypoxia and in vivo stroke models. It is anticipated that these studies will provide a novel platform for the delivery of therapeutic proteins across the BBB for regenerative therapy.