Moreno Ana Isabel, Orozco Yeison, Ocampo Sebastián, Malagón Sarita, Ossa Alex, Peláez-Vargas Alejandro, Paucar Carlos, Lopera Alex, Garcia Claudia
Grupo de Cerámicos y Vítreos, Universidad Nacional de Colombia sede Medellín, Medellín 050034, Colombia.
Faculty of Dentistry, Universidad Cooperativa de Colombia sede Medellín, Medellín 055422, Colombia.
Polymers (Basel). 2023 Jun 9;15(12):2629. doi: 10.3390/polym15122629.
Several diseases and injuries cause irreversible damage to bone tissues, which may require partial or total regeneration or replacement. Tissue engineering suggests developing substitutes that may contribute to the repair or regeneration process by using three-dimensional lattices (scaffolds) to create functional bone tissues. Herein, scaffolds comprising polylactic acid and wollastonite particles enriched with propolis extracts from the Arauca region of Colombia were developed as gyroid triply periodic minimal surfaces using fused deposition modeling. The propolis extracts exhibited antibacterial activity against (ATCC 25175) and (ATCC 12228), which cause osteomyelitis. The scaffolds were characterized using scanning electron microscopy, Fourier-transform infrared spectroscopy, differential scanning calorimetry, contact angle, swelling, and degradation. Their mechanical properties were assessed using static and dynamic tests. Cell viability/proliferation assay was conducted using hDP-MSC cultures, while their bactericidal properties against monospecies cultures ( and ) and cocultures were evaluated. The wollastonite particles did not affect the physical, mechanical, or thermal properties of the scaffolds. The contact angle results showed that there were no substantial differences in the hydrophobicity between scaffolds with and without particles. Scaffolds containing wollastonite particles suffered less degradation than those produced using PLA alone. A representative result of the cyclic tests at F = 450 N showed that the maximum strain reached after 8000 cycles is well below the yield strain (i.e., <7.5%), thereby indicating that even under these stringent conditions, these scaffolds will be able to work properly. The scaffolds impregnated with propolis showed a lower % of cell viability using hDP-MSCs on the 3rd day, but these values increased on the 7th day. These scaffolds exhibited antibacterial activity against the monospecies cultures of and and their cocultures. The samples without propolis loads did not show inhibition halos, whereas those loaded with EEP exhibited halos of 17.42 ± 0.2 mm against and 12.9 ± 0.5 mm against . These results made the scaffolds possible bone substitutes that exert control over species with a proliferative capacity for the biofilm-formation processes required for typical severe infectious processes.
几种疾病和损伤会对骨组织造成不可逆转的损害,这可能需要部分或全部再生或置换。组织工程学建议通过使用三维晶格(支架)来创建功能性骨组织,从而开发出有助于修复或再生过程的替代品。在此,利用熔融沉积建模技术,将包含聚乳酸和富含来自哥伦比亚阿劳卡地区蜂胶提取物的硅灰石颗粒的支架开发成类螺旋周期性最小表面。蜂胶提取物对引起骨髓炎的金黄色葡萄球菌(ATCC 25175)和大肠杆菌(ATCC 12228)具有抗菌活性。使用扫描电子显微镜、傅里叶变换红外光谱、差示扫描量热法、接触角、溶胀和降解对支架进行了表征。通过静态和动态测试评估了它们的力学性能。使用人脱细胞牙髓间充质干细胞(hDP-MSC)培养物进行细胞活力/增殖测定,同时评估了它们对单一菌种培养物(金黄色葡萄球菌和大肠杆菌)及其共培养物的杀菌性能。硅灰石颗粒未影响支架的物理、力学或热性能。接触角结果表明,含颗粒和不含颗粒的支架在疏水性方面没有实质性差异。含有硅灰石颗粒的支架比仅使用聚乳酸制备的支架降解程度更低。在F = 450 N下进行循环测试的一个代表性结果表明,8000次循环后达到的最大应变远低于屈服应变(即<7.5%),从而表明即使在这些严格条件下,这些支架仍能够正常工作。用蜂胶浸渍的支架在第3天使用hDP-MSCs时细胞活力百分比较低,但在第7天这些值有所增加。这些支架对金黄色葡萄球菌和大肠杆菌的单一菌种培养物及其共培养物表现出抗菌活性。未负载蜂胶的样品没有显示出抑菌圈,而负载乙醇提取物蜂胶(EEP)的样品对金黄色葡萄球菌显示出17.42±0.2 mm的抑菌圈,对大肠杆菌显示出12.9±0.5 mm的抑菌圈。这些结果使支架成为可能的骨替代物,能够控制对典型严重感染过程所需生物膜形成过程具有增殖能力的菌种。