BRAIN (Biomimetic Regenerative Angiogenic Immunomodulating Nanocomposite) materials for brain repair after stroke

BRAIN（仿生再生血管生成免疫调节纳米复合材料）用于中风后大脑修复的材料

基本信息

批准号：
10545034
负责人：
Lina R. Nih
金额：
$ 46.09万
依托单位：
LUNDQUIST INSTITUTE FOR BIOMEDICAL INNOVATION AT HARBOR-UCLA MEDICAL CENTER
依托单位国家：
美国
项目类别：
财政年份：
2022
资助国家：
美国
起止时间：
2022-01-01 至 2026-12-31
项目状态：
未结题

项目摘要

PROJECT SUMMARY Stroke is the leading cause of adult disability and one of the most common causes of death in the US. To date, no clinical trials have succeeded in alleviating patients' neurological impairment. The clinical and economical burden of this disease urges the need for a medical solution outside the confines of conventional practices in neurology. While the overwhelming majority of research on brain repair is centered on neurons, an increasing body of evidence suggests that angiogenesis and immunomodulation in the injured brain play a fundamental role in guiding post-stroke neuroplasticity and functional recovery. Recent advances in tissue engineering have led to the development of hydrogel materials that can be injected directly into the stroke lesion site to form cell- instructive scaffolds for tissue repair. However, these biomaterials have not been actively designed to promote angiogenesis and reduce inflammation in the lesion site, which significantly limits their reparative capability. We have recently shown that injection of hydrogels that are actively designed to promote angiogenesis or reduce inflammation enhance brain tissue repair, but do not lead to complete tissue regeneration or functional recovery. The studies in this grant investigate the development of a novel injectable material that is specifically designed to mimic the mechanical, structural, and biological properties of the brain extracellular matrix (ECM), while simultaneously inducing the formation of a mature and functional vascular network with a restored blood brain barrier, and modulating the immune response of reactive astrocytes and microglia in the injured brain. We propose to design, fabricate, characterize, and optimize the development of a “biomimetic regenerative angiogenic immunomodulating nanocomposite” (BRAIN) material that combines the synergic reparative potential of two distinct engineered systems previously developed by our team: 1) a microporous scaffold made of annealable microgel building blocks to target the post-stroke immune response, and 2) highly clustered vascular endothelial growth factor (hcV) immobilized onto heparin nanoparticles, to promote angiogenesis in the lesion site. We will follow a systematic multifactorial mathematical approach to simultaneously alter the mechanical, structural and biological hydrogel properties and screen for the optimal formulations that result in the highest degree of brain tissue regeneration and functional recovery. Successful completion of this proposal will pave the way for pioneering nanotechnology-based medical solutions to repair the injured brain and regain lost function after stroke.

项目概要迄今为止，中风是美国成人残疾的主要原因，也是最常见的死亡原因之一。尚无临床试验成功地减轻患者的神经功能障碍。这种疾病的负担促使我们需要一种超越传统做法范围的医疗解决方案虽然绝大多数关于大脑修复的研究都集中在神经元上，但越来越多的研究都集中在神经元上。大量证据表明，受伤大脑中的血管生成和免疫调节发挥着重要作用组织工程的最新进展在指导中风后神经可塑性和功能恢复方面发挥着重要作用。导致了水凝胶材料的开发，该材料可以直接注射到中风病变部位以形成细胞- 然而，这些生物材料尚未被积极设计来促进组织修复。血管生成并减少病变部位的炎症，这显着限制了它们的修复能力。最近的研究表明，注射水凝胶可以促进血管生成或减少炎症增强脑组织修复，但不会导致组织完全再生或功能恢复。这项资助的研究调查了一种专门设计的新型注射材料的开发模仿大脑细胞外基质（ECM）的机械、结构和生物特性，同时同时诱导成熟且功能齐全的血管网络的形成以及血脑的恢复屏障，并调节受伤大脑中反应性星形胶质细胞和小胶质细胞的免疫反应。提议设计、制造、表征和优化“仿生再生”的开发血管生成免疫调节纳米复合材料”（BRAIN）材料，结合了协同修复潜力我们团队之前开发的两个不同的工程系统：1）由以下材料制成的微孔支架可退火的微凝胶构建块，以针对中风后免疫反应，以及2）高度聚集的血管内皮生长因子（hcV）固定在肝素纳米颗粒上，促进病变部位的血管生成我们将遵循系统的多因素数学方法来同时改变机械、结构和生物水凝胶的最佳特性并筛选可产生最高效果的配方该提案的成功完成将为脑组织再生和功能恢复程度铺平道路。开创基于纳米技术的医疗解决方案来修复受伤的大脑并恢复失去的功能中风后。