title: Enhancement of neurite adhesion, alignment and elongation on conductive polypyrrole-poly(lactide acid) fibers with cell-derived extracellular matrix.
abstract: Extracellular matrix (ECM) can promote peripheral nerve repair. In this study, a conductive fiber-film (CFF) with core-sheath structure and conductivity of ∼10Scm-1was prepared by electrospinning of aligned poly(l-lactide acid) (PLLA) fibers and electrochemical deposition of polypyrole (PPy) nanoparticles. Then the multiple components of ECM, including laminin, fibronectin and collagen, were coated on the surface of CFF by culturing and lysing L929 cells to fabricate the bioactive scaffold of ECM-linked CFF (ECM-CFF). The electrical stimulation (ES) of 100mV/cm for 14days and 2h per day did not significantly decrease the conductivity of ECM-CFF. The results of PC12 cells test indicated that, cells adhesion rate, neurite-bearing cell rate and neurite alignment rate on ECM-CFF were ∼95%, ∼77%, ∼70%, respectively, significantly larger than the corresponding values on bare CFF (17%, 29% and 14%, respectively). The neurites length on ECM-CFF (∼79mm) was also larger than that on bare CFF (∼25mm). ES of 100mV/cm onto PC12 cells through ECM-CFF could significantly promote neurite extension in first 3days of the neurite growth. These results indicated that, the combination of ECM-CFF with ES could improve the nerve regeneration by encouraging neural-cell adhesion, neurite growth and extension.
authors: College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China.
authors: Xingxing
authors: X
authors: Zhou
authors: College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China.
authors: Anneng
authors: A
authors: Yang
authors: College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China. Electronic address: zbhuang@scu.edu.cn.
authors: Zhongbing
authors: Z
authors: Huang
authors: College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China.
authors: Guangfu
authors: G
authors: Yin
authors: College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China.
authors: Ximing
authors: X
authors: Pu
authors: College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China.
authors: Juan
authors: J
authors: Jin
mesh_terms: D000818:Animals; D002448:Cell Adhesion / Q000187:drug effects; D002454:Cell Differentiation; D002460:Cell Line; D003094:Collagen / Q000737:chemistry / Q000494:pharmacology*; D004553:Electric Conductivity; D004558:Electric Stimulation; D005109:Extracellular Matrix / Q000737:chemistry; D005347:Fibroblasts / Q000166:cytology; D005353:Fibronectins / Q000737:chemistry / Q000494:pharmacology*; D007797:Laminin / Q000737:chemistry / Q000494:pharmacology*; D051379:Mice; D053758:Nanoparticles / Q000737:chemistry*; D000071446:Neuronal Outgrowth / Q000187:drug effects*; D009474:Neurons / Q000166:cytology / Q000187:drug effects* / Q000502:physiology; D016716:PC12 Cells; D011091:Polyesters / Q000737:chemistry / Q000494:pharmacology; D011108:Polymers / Q000737:chemistry / Q000494:pharmacology; D011758:Pyrroles / Q000737:chemistry / Q000494:pharmacology; D051381:Rats
chemical_list: D005353:Fibronectins; D007797:Laminin; D011091:Polyesters; D011108:Polymers; D011758:Pyrroles; C067635:polypyrrole; C033616:poly(lactide); D003094:Collagen
keywords: Conductive composite fibers; Extracellular matrix; Nerve cell adhesion; Nerve regeneration; Neurites elongation and alignment