McKeon-Fischer Kristin D, Browe Daniel P, Olabisi Ronke M, Freeman Joseph W
Department of Biomedical Engineering, Rutgers University, Piscataway, New Jersey, 08854.
J Biomed Mater Res A. 2015 Nov;103(11):3633-41. doi: 10.1002/jbm.a.35481. Epub 2015 Jun 25.
Injuries to peripheral nerves and/or skeletal muscle can cause scar tissue formation and loss of function. The focus of this article is the creation of a conductive, biocompatible scaffold with appropriate mechanical properties to regenerate skeletal muscle. Poly(3,4-ethylenedioxythiophene) (PEDOT) nanoparticles (Np) were electrospun with poly(ɛ-caprolactone) (PCL) to form conductive scaffolds. During electrospinning, ribboning, larger fiber diameters, and unaligned scaffolds were observed with increasing PEDOT amounts. To address this, PEDOT Np were sonicated prior to electrospinning, which resulted in decreased conductivity and increased mechanical properties. Multi-walled carbon nanotubes (MWCNT) were added to the 1:2 solution in an effort to increase conductivity. However, the addition of MWCNT had little effect on scaffold conductivity, and the elastic modulus and yield stress of the scaffold increased as a result. Rat muscle cells attached and were active on the 1-10, 1-2, 3-4, and 1-1 PCL-PEDOT scaffolds; however, the 3-4 scaffolds had the lowest level of metabolic activity. Although the scaffolds were cytocompatible, further development of the fabrication method is necessary to produce more highly aligned scaffolds capable of promoting skeletal muscle cell alignment and eventual regeneration.
外周神经和/或骨骼肌损伤会导致瘢痕组织形成和功能丧失。本文的重点是创建一种具有适当机械性能的导电、生物相容性支架,以促进骨骼肌再生。聚(3,4-乙撑二氧噻吩)(PEDOT)纳米颗粒(Np)与聚(ε-己内酯)(PCL)进行电纺丝,以形成导电支架。在电纺丝过程中,随着PEDOT含量的增加,观察到带状、更大的纤维直径和排列不齐的支架。为了解决这个问题,在电纺丝之前对PEDOT Np进行超声处理,这导致电导率降低和机械性能提高。添加多壁碳纳米管(MWCNT)到1:2的溶液中,以提高电导率。然而,MWCNT的添加对支架电导率影响不大,结果支架的弹性模量和屈服应力增加。大鼠肌肉细胞附着在1-10、1-2、3-4和1-1的PCL-PEDOT支架上并具有活性;然而,3-4支架的代谢活性水平最低。尽管这些支架具有细胞相容性,但仍需要进一步改进制造方法,以生产出能够促进骨骼肌细胞排列并最终实现再生的排列更整齐的支架。