中国组织工程研究 ›› 2025, Vol. 29 ›› Issue (28): 6070-6082.doi: 10.12307/2025.481

• 材料力学及表面改性 material mechanics and surface modification • 上一篇    下一篇

负载钛酸钙取向性静电纺聚己内酯/丝素蛋白支架促进周围神经再生

柳小军1,2,商雨情3,管文超3,许琳琳1,2,李贵才3   

  1. 1河南省药品医疗器械检验院,河南省郑州市   450018;2国家药监局医用生物防护及植入器械质量评价重点实验室,河南省郑州市   450018;3南通大学神经再生教育部重点实验室,江苏省南通市   226001
  • 收稿日期:2024-06-01 接受日期:2024-07-30 出版日期:2025-10-08 发布日期:2024-12-07
  • 通讯作者: 李贵才,博士,教授,南通大学神经再生教育部重点实验室,江苏省南通市 226001
  • 作者简介:柳小军,男,1984年生,河南省开封市人,汉族,2011年河南工业大学毕业,硕士,工程师,主要从事医疗器械及生物材料的研究。
  • 基金资助:
    国家自然科学基金项目(32171352),项目负责人:李贵才;国家药监局医用生物防护及植入器械质量评价重点实验室开放课题项目(2023-02),项目负责人:李贵才

Oriented electrostatically spun polycaprolactone/silk fibroin scaffold loaded with calcium titanate promotes peripheral nerve regeneration

Liu Xiaojun1, 2, Shang Yuqing3, Guan Wenchao3, Xu Linlin1, 2, Li Guicai3   

  1. 1Henan Institute for Drug and Medical Device Inspection, Zhengzhou 450018, Henan Province, China; 2Key Laboratory for Quality Evaluation of Medical Protective and Implant Devices of National Medical Products Administration, Zhengzhou 450018, Henan Province, China; 3Key Laboratory of Neuroregeneration of Ministry of Education, Nantong University, Nantong 226001, Jiangsu Province, China
  • Received:2024-06-01 Accepted:2024-07-30 Online:2025-10-08 Published:2024-12-07
  • Contact: Li Guicai, PhD, Professor, Key Laboratory of Neuroregeneration of Ministry of Education, Nantong University, Nantong 226001, Jiangsu Province, China
  • About author:Liu Xiaojun, MS, Engineer, Henan Institute for Drug and Medical Device Inspection, Zhengzhou 450018, Henan Province, China; Key Laboratory for Quality Evaluation of Medical Protective and Implant Devices of National Medical Products Administration, Zhengzhou 450018, Henan Province, China
  • Supported by:
    National Natural Science Foundation of China, No. 32171352 (to LGC); Key Laboratory of Medical Biological Protection and Implant Device Quality Evaluation Open Project of National Medical Products Administration, No. 2023-02 (to LGC)

摘要:


文题释义:

钛酸钙:是一种导电陶瓷材料,表面带有正电荷,有利于细胞间的黏附,又因具有良好的导电性能及生物相容性被广泛运用于生物医学材料领域。
静电纺丝:是一种利用聚合物溶液在强电场作用下形成喷射流进行纺丝加工的工艺,主要用于制备微/纳米纤维支架。由于静电纺丝技术制备的微/纳米纤维具备较高比表面积、高孔隙率及高选择透过性等特点,目前在组织工程领域应用广泛。


背景:取向性聚己内酯/丝素蛋白共混静电纺丝支架修复周围神经损伤可促进神经再生,但修复效果有限,还需要进一步结合生物活性材料、生长因子等因素制备仿生神经支架。钛酸钙纳米颗粒具有促进施万细胞间黏附的能力,已被广泛运用于生物医学材料领域。

目的:采用静电纺丝技术制备取向性聚己内酯/丝素蛋白-钛酸钙功能化支架,进一步探索该支架对施万细胞活力与黏附的影响。
方法:采用静电纺丝技术制备聚己内酯/丝素蛋白支架,通过调整制备过程中的注射器流速、接收装置转速、纺丝时间筛选最优参数进行后续实验。在最优参数下,采用静电纺丝技术制备随机取向聚己内酯/丝素蛋白支架(记为PCL/SF-R)、取向性聚己内酯/丝素蛋白支架(记为CTO-0)及含0.1,0.5,1.0 mg/mL聚多巴胺修饰钛酸钙的取向性聚己内酯/丝素蛋白支架(依次记为 CTO-1、CTO-5、CTO-10),表征5组支架的物理性能。将5组支架浸提液分别与大鼠成纤维细胞系(L929)共培养,采用MTT法检测细胞增殖。将大鼠施万细胞系(RSC96)分别接种于5组支架上,进行细胞活力、细胞骨架染色及细胞骨架与细胞黏附相关基因检测。

结果与结论:①制备静电纺丝支架的最优参数为:注射器流速15 µL/min,接收装置转速1 800 r/min,纺丝时间1 h;②PCL/SF-R组水接触角最大、弹性模量最小,CTO-0组水接触角最小、弹性模量最大;CTO-0组支架降解速率低于CTO-1组,并且随着取向性支架中钛酸钙质量浓度的增加,支架的降解速率降低;③5组支架对L929细胞无毒性作用,具有良好的生物相容性;CCK-8检测结果显示,CTO-10可提升RSC96细胞活力;细胞骨架染色结果显示,取向性支架上细胞的长宽比和细胞突起长度均高于随机取向支架;qPCR检测结果显示,CTO-5组、CTO-0组YAP、Cntn2 mRNA表达均高于PCL/SF-R组(P < 0.05);④结果表明,取向性聚己内酯/丝素蛋白-钛酸钙支架具有良好的生物相容性、力学性能及亲水性,可提升施万细胞的活力与迁移能力,促进周围神经再生。

https://orcid.org/0000-0002-2897-1795 (柳小军) 

中国组织工程研究杂志出版内容重点:生物材料;骨生物材料;口腔生物材料;纳米材料;缓释材料;材料相容性;组织工程

关键词: 钛酸钙, 取向性静电纺丝, 聚己内酯, 丝素蛋白, 周围神经再生, 工程化神经材料

Abstract: BACKGROUND: Oriented polycaprolactone/silk fibroin blend electrospinning scaffolds can repair peripheral nerve damage and promote nerve regeneration, but the repair effect is limited, and it is necessary to further combine bioactive materials, growth factors, and other factors to prepare bionic neural scaffolds. Calcium titanate nanoparticles have the ability to promote adhesion between Schwann cells and have been widely used in the field of biomedical materials. 
OBJECTIVE: To prepare polycaprolactone/silk fibroin-calcium titanate functionalized scaffolds by electrospinning technology, and to further explore the effect of the scaffold on Schwann cell viability and adhesion. 
METHODS: Polycaprolactone/silk fibroin scaffolds were prepared by electrospinning technology. The optimal parameters were selected by adjusting the syringe flow rate, receiving device speed and spinning time during the preparation process for subsequent experiments. Under the optimal parameters, randomly oriented polycaprolactone/silk fibroin scaffolds (denoted as PCL/SF-R), oriented polycaprolactone/silk fibroin scaffolds (denoted as CTO-0), and oriented polycaprolactone/silk fibroin scaffolds containing 0.1, 0.5, and 1.0 mg/mL polydopamine modified calcium titanate (denoted as CTO-1, CTO-5, and CTO-10, respectively) were prepared by electrospinning technology. The physical properties of the five groups of scaffolds were characterized. The extracts of the five groups of scaffolds were co-cultured with rat fibroblast cell line (L929). Cell proliferation was detected by MTT assay. Rat Schwann cell line (RSC96) was inoculated on the five groups of scaffolds. Cell viability, cytoskeleton staining, and cytoskeleton and cell adhesion related genes were detected.
RESULTS AND CONCLUSION: (1) The optimal parameters for preparing electrospinning scaffolds were as follows: syringe flow rate 15 µL/min, receiving device speed 1 800 r/min, and spinning time 1 hour. (2) The PCL/SF-R group had the largest water contact angle and the smallest elastic modulus, while the CTO-0 group had the smallest water contact angle and the largest elastic modulus. The degradation rate of the scaffolds in the CTO-0 group was lower than that in the CTO-1 group, and the degradation rate of the scaffolds decreased with the increase of the mass concentration of calcium titanate in the oriented scaffolds. (3) The scaffolds in the five groups had no toxic effects on L929 cells and had good biocompatibility. CCK-8 assay results showed that CTO-10 could improve the viability of RSC96 cells. Cytoskeleton staining results showed that the aspect ratio and cell protrusion length of cells on the oriented scaffolds were higher than those on the randomly oriented scaffolds. qPCR test results showed that the mRNA expressions of YAP and Cntn2 in the CTO-5 and CTO-0 groups were higher than those in the PCL/SF-R group (P < 0.05). (4) The results indicate that the oriented polycaprolactone/silk fibroin-calcium titanate scaffold has good biocompatibility, mechanical properties, and hydrophilicity, which can enhance the viability and migration ability of Schwann cells and promote peripheral nerve regeneration.

Key words: calcium titanate, aligned electrospinning, polycaprolactone, silk fibroin, peripheral nerve regeneration, engineered neural material

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