Toker-Bayraktar Melis, Garipcan Bora, Waldman Stephen D
Institute of Biomedical Engineering, Bogazici University, Istanbul, Turkey.
Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Canada.
Biomed Mater. 2025 Jul 11;20(4). doi: 10.1088/1748-605X/adebd2.
Cartilage is a load-bearing connective tissue with limited self-healing capacity and tissue engineering approaches aim to develop functional scaffolds for the repair and regeneration of damaged cartilage. Scaffold porosity and mechanical characteristics play important roles to support cell growth and provide tissue function. In most cases, however, they are inversely correlated. Therefore, manufacturing highly porous scaffolds with suitable mechanical properties is one of the major challenges in cartilage tissue engineering. In this study, lucky bamboo () was chosen as a cartilage tissue engineering scaffold since it can provide high porosity (86 ± 10%), appropriate pore size (26 ± 8 µm) and desirable elastic modulus (0.9 ± 0.4 MPa) comparable with native articular cartilage (∼1 MPa). Chemical decellularization was accomplished using sodium dodecyl sulfate to remove the cellular content (-77%) without causing any significant damage to the cellulose structure of the lucky bamboo scaffolds. Decellularized scaffolds were seeded with primary bovine chondrocytes and cultured for up to 8 weeks. Effect on cell proliferation and extracellular matrix (ECM) accumulation were analyzed using biochemical, histological and immunohistochemical methods. A homogenous cell distribution throughout the decellularized scaffolds was observed and the presence of type Ⅱ collagen and aggrecan indicated that the seeded cells retained their chondrogenic phenotype during the culture period. In addition, cellularity and ECM accumulation within the scaffolds significantly increased with time in culture. Overall, these findings were very promising and support decellularized lucky bamboo as a potential scaffold material in cartilage tissue engineering applications.
软骨是一种具有有限自我修复能力的承重结缔组织,组织工程方法旨在开发用于受损软骨修复和再生的功能性支架。支架的孔隙率和力学特性对支持细胞生长和提供组织功能起着重要作用。然而,在大多数情况下,它们是负相关的。因此,制造具有合适力学性能的高孔隙率支架是软骨组织工程中的主要挑战之一。在本研究中,幸运竹被选作软骨组织工程支架,因为它能提供与天然关节软骨(约1兆帕)相当的高孔隙率(86±10%)、合适的孔径(26±8微米)和理想的弹性模量(0.9±0.4兆帕)。使用十二烷基硫酸钠进行化学脱细胞处理,以去除细胞成分(-77%),而不会对幸运竹支架的纤维素结构造成任何显著损伤。将原代牛软骨细胞接种到脱细胞支架上,并培养长达8周。使用生化、组织学和免疫组织化学方法分析对细胞增殖和细胞外基质(ECM)积累的影响。观察到整个脱细胞支架中有均匀的细胞分布,Ⅱ型胶原蛋白和聚集蛋白聚糖的存在表明接种的细胞在培养期间保持了其软骨形成表型。此外,支架内的细胞密度和ECM积累随着培养时间的延长而显著增加。总体而言,这些发现非常有前景,并支持脱细胞幸运竹作为软骨组织工程应用中的潜在支架材料。