Department of Sports Medicine, Institute of Sports Medicine of Peking University, Peking University Third Hospital, Beijing 100191, China.
Beijing Key Laboratory of Sports Injuries, Beijing 100191, China.
ACS Appl Mater Interfaces. 2024 Jan 10;16(1):292-304. doi: 10.1021/acsami.3c14959. Epub 2023 Dec 22.
Rotator cuff tear (RCT) is a prevalent shoulder injury that poses challenges for achieving continuous and functional regeneration of the tendon-to-bone interface (TBI). In this study, we controlled the delivery of growth factors (GFs) from liposomal nanohybrid cerasomes by ultrasound and implanted three-dimensional printed polycaprolactone (PCL) scaffolds modified with polydopamine loaded with bone marrow mesenchymal stem cells (BMSCs) to repair tears of the infraspinatus tendon in a lapine model. Direct suturing (control, CTL) was used as a control. The PCL/BMSC/cerasome (PBC) devices are sutured with the enthesis of the infraspinatus tendon. The cerasomes and PCL scaffolds are highly stable with excellent biocompatibility. The roles of GFs BMP2, TGFβ1, and FGF2 in tissue-specific differentiation are validated. Compared with the CTL group, the PBC group had significantly greater proteoglycan deposition ( = 0.0218), collagen volume fraction ( = 0.0078), and proportions of collagen I ( = 0.0085) and collagen III ( = 0.0048). Biotin-labeled in situ hybridization revealed a high rate of survival for transplanted BMSCs. Collagen type co-staining at the TBI is consistent with multiple collagen regeneration. Our studies demonstrate the validity of biomimetic scaffolds of TBI with BMSC-seeded PCL scaffolds and GF-loaded cerasomes to enhance the treatment outcomes for RCTs.
肩袖撕裂(RCT)是一种常见的肩部损伤,它对实现肌腱-骨界面(TBI)的连续和功能再生提出了挑战。在这项研究中,我们通过超声控制脂质体纳米杂化神经酰胺体中生长因子(GFs)的释放,并植入了经聚多巴胺负载骨髓间充质干细胞(BMSCs)改性的三维打印聚己内酯(PCL)支架,以修复兔模型中冈下肌腱的撕裂。直接缝合(对照组,CTL)作为对照。PCL/BMSC/cerasome(PBC)装置与冈下肌腱的附着点缝合。神经酰胺体和 PCL 支架具有高度稳定性和良好的生物相容性。验证了 GFs BMP2、TGFβ1 和 FGF2 在组织特异性分化中的作用。与 CTL 组相比,PBC 组的糖胺聚糖沉积显著增加(=0.0218),胶原体积分数显著增加(=0.0078),I 型胶原和 III 型胶原的比例也显著增加(=0.0085 和=0.0048)。生物素标记原位杂交显示移植的 BMSCs 存活率很高。TBI 处的胶原类型共染色与多种胶原再生一致。我们的研究证明了具有 BMSC 种子的 PCL 支架和负载 GFs 的神经酰胺体的 TBI 仿生支架的有效性,可增强 RCT 的治疗效果。