Lee Junhyeok, Song Hyeong-Woo, Nguyen Kim Tien, Kim Seokjae, Nan Minghui, Park Jong-Oh, Go Gwangjun, Choi Eunpyo
School of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
Robot Research Initiative, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
Micromachines (Basel). 2023 Feb 11;14(2):434. doi: 10.3390/mi14020434.
Magnetic microscaffolds capable of targeted cell delivery have been developed for tissue regeneration. However, the microscaffolds developed so far with similar morphologies have limitations for applications to osteochondral disease, which requires simultaneous treatment of the cartilage and subchondral bone. This study proposes magnetically actuated microscaffolds tailored to the cartilage and subchondral bone for osteochondral tissue regeneration, named magnetically actuated microscaffolds for cartilage regeneration (MAM-CR) and for subchondral bone regeneration (MAM-SBR). The morphologies of the microscaffolds were controlled using a double emulsion and microfluidic flow. In addition, due to their different sizes, MAM-CR and MAM-SBR have different magnetizations because of the different amounts of magnetic nanoparticles attached to their surfaces. In terms of biocompatibility, both microscaffolds were shown to grow cells without toxicity as potential cell carriers. In magnetic actuation tests of the microscaffolds, the relatively larger MAM-SBR moved faster than the MAM-CR under the same magnetic field strength. In a feasibility test, the magnetic targeting of the microscaffolds in 3D knee cartilage phantoms showed that the MAM-SBR and MAM-CR were sequentially moved to the target sites. Thus, the proposed magnetically actuated microscaffolds provide noninvasive treatment for osteochondral tissue disease.
能够进行靶向细胞递送的磁性微支架已被开发用于组织再生。然而,迄今为止开发的具有相似形态的微支架在应用于骨软骨疾病时存在局限性,骨软骨疾病需要同时治疗软骨和软骨下骨。本研究提出了针对软骨和软骨下骨定制的磁驱动微支架用于骨软骨组织再生,分别命名为用于软骨再生的磁驱动微支架(MAM-CR)和用于软骨下骨再生的磁驱动微支架(MAM-SBR)。使用双乳液和微流体流动来控制微支架的形态。此外,由于它们的尺寸不同,MAM-CR和MAM-SBR由于附着在其表面的磁性纳米颗粒数量不同而具有不同的磁化强度。在生物相容性方面,两种微支架均显示出作为潜在细胞载体在无毒性的情况下促进细胞生长。在微支架的磁驱动测试中,在相同磁场强度下,相对较大的MAM-SBR比MAM-CR移动得更快。在可行性测试中,微支架在三维膝关节软骨模型中的磁靶向显示,MAM-SBR和MAM-CR被依次移动到目标部位。因此,所提出的磁驱动微支架为骨软骨组织疾病提供了非侵入性治疗方法。
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