SOD3 regulation of redox sensitive signaling in pulmonary vascular diseases

这项研究计划的总体任务是确定抗氧化酶、细胞外 超氧化物歧化酶(EC-SOD或SOD3)调节氧化还原敏感信号通路 不同年龄段肺血管疾病的炎症和纤维化，并利用这一知识 设计新的精确疗法。不同的研究项目基于三个互补的主题。 主题1探讨SOD3在健康和疾病人群中的表达、活性和分布规律 成熟肺和未成熟肺的肺循环。这些研究将包括体外和体内研究 使用动物模型的研究，以及通过新的人体研究来翻译这项工作的活动。他们会 解决多层次的SOD3调控，包括遗传多态、表观遗传调控或 其他翻译后SOD3修饰，可影响基因表达、酶活性、半衰期和 本地化。主题2评估SOD3活动或结合属性的变化如何影响氧化还原敏感性 导致肺血管疾病发展的信号通路，尤其是， 炎症和随后的血管重塑和纤维化。这些实验利用了一系列独特的 SOD3小鼠品系，包括一只具有已知人类SOD3多态基因敲入的小鼠 个体SOD3位置或含量的变化如何影响疾病的发病机制和严重程度。基座 关于SOD3在细胞外的独特定位，研究将测试SOD3不足对基质的影响 完整性、基质-细胞相互作用、细胞-细胞相互作用以及细胞外信号和 细胞内的细胞反应。正在进行的研究正在测试血管SOD3的丧失如何增加 定位于细胞外基质(ECM)的两个关键氧化还原敏感靶点的敏感性：潜伏激活 转化生长因子-β，促进PASMC和成纤维细胞的生长、炎症和合成功能，或氧化 与巨噬细胞CD44受体结合并激活NLRP3的透明质酸裂解 炎症者。未来计划中的研究将测试改变SOD3如何影响氧化还原环境以进行调制 先天免疫、细胞代谢和线粒体功能障碍与PH血管纤维化有关。 主题3将这些发现转化为新的治疗策略，以补充缺乏SOD3的SOD3以恢复氧化还原 动态平衡。这一框架得到了一项新倡议的支持，该倡议由院长的战略基础设施提供资金 研究委员会奖，购买电子顺磁共振光谱仪，以开发 一个协作性和跨学科的UCD氧化还原生物学共享资源设施，以促进对 氧化还原生物学。这些研究将共同提供与Precision任务相关的新见解 医学计划，因为他们将揭示影响SOD3的单个变量如何影响发展 关于肺动脉高压的炎症和纤维化的研究。

The overall mission of this research program is to determine how the antioxidant enzyme, extracellular superoxide dismutase (EC-SOD or SOD3) regulates redox-sensitive signaling pathways responsible for inflammation and fibrosis in pulmonary vascular diseases across the age span, and harness this knowledge to design new and precise therapies. The different research projects are based on three complementary themes. Theme 1 interrogates the regulation of SOD3 expression, activity and distribution in the healthy and diseased pulmonary circulation in the mature and immature lung. These studies would include in vitro, and in vivo studies using animal models, as well as activity translating the work through new human studies. They will address the multiple levels of SOD3 regulation, including genetic polymorphisms, epigenetic regulation, or other post-translation SOD3 modifications, that can influence gene expression, enzyme activity, half-life and localization. Theme 2 evaluates how changes in SOD3 activity or binding properties impact redox sensitive signaling pathways that are responsible for the development of pulmonary vascular disease, in particular, inflammation and subsequent vascular remodeling and fibrosis. These experiments utilize a unique series of SOD3 mouse strains, including a mouse with knock-in of a known human SOD3 polymorphism, to interrogate how individual changes in SOD3 location or content can influence disease pathogenesis and severity. Based on the unique extracellular localization of SOD3, studies will test the effects of insufficient SOD3 on matrix integrity, matrix-cell interactions, cell-cell interactions and communication between extracellular signals and intracellular cellular responses. Ongoing studies are testing how the loss of vascular SOD3 increases the susceptibility of two key redox-sensitive targets localized to the extracellular matrix (ECM): activation of latent TGF-β, which enhances PASMC and fibroblast growth, inflammation and synthetic function, or oxidative fragmentation of hyaluronan, which binds to macrophage CD44 receptors and activates the NLRP3 inflammasome. Future planned studies will test how altered SOD3 impacts the redox landscape to modulate innate immunity, cellular metabolism and mitochondrial dysfunction responsible for vascular fibrosis in PH. Theme 3 translates the findings into new therapeutic strategies to replenish deficient SOD3 to restore redox homeostasis. This framework is supported by a new initiative, funded by a Dean's Strategic Infrastructure Research Committee Award for the purchase of an electron paramagnetic resonance spectrometer, to develop a collaborative and interdisciplinary UCD Redox Biology Shared Resource Facility to advance the study of Redox Biology. These studies collectively will provide new insight relevant to the mission of the Precision Medicine Initiative, as they will uncover how individual variables that influence SOD3 impact the development of inflammation and fibrosis in pulmonary hypertension.