在美国,多达 40% 的成年女性患有尿失禁。压力性尿失禁 (SUI) 约占这些病例的三分之一,每年约有 200,000 次外科手术。通过尿道下支撑和尿道括约肌接合的相互作用来维持节制,特别是在增加腹内压力的活动期间。目前,SUI的手术矫正主要集中在尿道下支撑的重建上。然而,基于网片的修复与异物反应和局部组织愈合不良有关,这会导致网片暴露,促使人们寻求恢复外尿道括约肌功能和限制手术风险的技术。目前的工作利用人类血小板衍生的 CD41a 和 CD9 表达细胞外囊泡产物 (PEP),富含 NF-κB 和 PD-L1 并衍生以确保脂质双层的保存,以增强稳定性和与基于水凝胶的持续递送方法的兼容性。在体外,在体外将 PEP 应用于骨骼肌卫星细胞以 NF-κB 依赖性方式驱动增殖和分化,完全抑制对白藜芦醇暴露的影响。胶原蛋白-1 和纤维蛋白胶水凝胶的 PEP 生物增强在 37°C 下实现了持续的外泌体释放,在扫描电子显微镜下形成了超微结构“串珠”图案。在背阔肌损伤啮齿动物模型中的初步测试记录了骨骼肌增殖愈合的激活。在压力性尿失禁的猪模型中,PEP 生物增强型胶原蛋白-1 的递送诱导了外尿道括约肌的功能恢复。组织学评估发现,持续的 PEP 释放与新骨骼肌的形成和局部巨噬细胞向再生 M2 表型的极化有关。本文提供的结果首次描述了基于 PEP 的水凝胶生物增强功能,用于恢复骨骼肌功能,并可作为 SUI 非手术治疗的有前景的方法。组织学评估发现,持续的 PEP 释放与新骨骼肌的形成和局部巨噬细胞向再生 M2 表型的极化有关。本文提供的结果首次描述了基于 PEP 的水凝胶生物增强功能,用于恢复骨骼肌功能,并可作为 SUI 非手术治疗的有前景的方法。组织学评估发现,持续的 PEP 释放与新骨骼肌的形成和局部巨噬细胞向再生 M2 表型的极化有关。本文提供的结果首次描述了基于 PEP 的水凝胶生物增强功能,用于恢复骨骼肌功能,并可作为 SUI 非手术治疗的有前景的方法。
"点击查看英文标题和摘要"
Exosome biopotentiated hydrogel restores damaged skeletal muscle in a porcine model of stress urinary incontinence
Urinary incontinence afflicts up to 40% of adult women in the United States. Stress urinary incontinence (SUI) accounts for approximately one-third of these cases, precipitating ~200,000 surgical procedures annually. Continence is maintained through the interplay of sub-urethral support and urethral sphincter coaptation, particularly during activities that increase intra-abdominal pressure. Currently, surgical correction of SUI focuses on the re-establishment of sub-urethral support. However, mesh-based repairs are associated with foreign body reactions and poor localized tissue healing, which leads to mesh exposure, prompting the pursuit of technologies that restore external urethral sphincter function and limit surgical risk. The present work utilizes a human platelet-derived CD41a and CD9 expressing extracellular vesicle product (PEP) enriched for NF-κB and PD-L1 and derived to ensure the preservation of lipid bilayer for enhanced stability and compatibility with hydrogel-based sustained delivery approaches. In vitro, the application of PEP to skeletal muscle satellite cells in vitro drove proliferation and differentiation in an NF-κB-dependent fashion, with full inhibition of impact on exposure to resveratrol. PEP biopotentiation of collagen-1 and fibrin glue hydrogel achieved sustained exosome release at 37 °C, creating an ultrastructural “bead on a string” pattern on scanning electron microscopy. Initial testing in a rodent model of latissimus dorsi injury documented activation of skeletal muscle proliferation of healing. In a porcine model of stress urinary incontinence, delivery of PEP-biopotentiated collagen-1 induced functional restoration of the external urethral sphincter. The histological evaluation found that sustained PEP release was associated with new skeletal muscle formation and polarization of local macrophages towards the regenerative M2 phenotype. The results provided herein serve as the first description of PEP-based biopotentiation of hydrogels implemented to restore skeletal muscle function and may serve as a promising approach for the nonsurgical management of SUI.