title: Bi-layer collagen/microporous electrospun nanofiber scaffold improves the osteochondral regeneration.
abstract: An optimal scaffold is crucial for osteochondral regeneration. Collagen and electrospun nanofibers have been demonstrated to facilitate cartilage and bone regeneration, respectively. However, the effect of combining collagen and electrospun nanofibers on osteochondral regeneration has yet to be evaluated. Here, we report that the combination of collagen and electrospun poly-l-lactic acid nanofibers synergistically promotes osteochondral regeneration. We first fabricated bi-layer microporous scaffold with collagen and electrospun poly-l-lactic acid nanofibers (COL-nanofiber). Mesenchymal stem cells were cultured on the bi-layer scaffold and their adhesion, proliferation and differentiation were examined. Moreover, osteochondral defects were created in rabbits and implanted with COL-nanofiber scaffold. Cartilage and subchondral bone regeneration were evaluated at 6 and 12weeks after surgery. Compared with COL scaffold, cells on COL-nanofiber scaffold exhibited more robust osteogenic differentiation, indicated by higher expression levels of OCN and runx2 genes as well as the accumulation of calcium nodules. Furthermore, implantation of COL-nanofiber scaffold seeded with cells induced more rapid subchondral bone emergence, and better cartilage formation, which led to better functional repair of osteochondral defects as manifested by histological staining, biomechanical test and micro-computed tomography data. Our study underscores the potential of using the bi-layer microporous COL-nanofiber scaffold for the treatment of deep osteochondral defects.
authors.affiliation: Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China.
authors.forename: Shufang
authors.initials: S
authors.lastname: Zhang
authors.forename: Longkun
authors.initials: L
authors.lastname: Chen
authors.forename: Yangzi
authors.initials: Y
authors.lastname: Jiang
authors.forename: Youzhi
authors.initials: Y
authors.lastname: Cai
authors.forename: Guowei
authors.initials: G
authors.lastname: Xu
authors.forename: Tong
authors.initials: T
authors.lastname: Tong
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Linlin
authors.initials: L
authors.lastname: Wang
authors.forename: Junfeng
authors.initials: J
authors.lastname: Ji
authors.forename: Peihua
authors.initials: P
authors.lastname: Shi
authors.forename: Hong Wei
authors.initials: HW
authors.lastname: Ouyang
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D020219:Chondrogenesis / Q000502:physiology; D003094:Collagen / Q000737:chemistry*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D050724:Fractures, Cartilage / Q000473:pathology / Q000503:physiopathology* / Q000601:surgery*; D048091:Guided Tissue Regeneration / Q000295:instrumentation*; D019344:Lactic Acid / Q000737:chemistry; D008297:Male; D008422:Materials Testing; D045164:Mesenchymal Stem Cell Transplantation / Q000295:instrumentation*; D057139:Nanofibers / Q000737:chemistry* / Q000648:ultrastructure; D010012:Osteogenesis / Q000502:physiology; D011091:Polyesters; D011108:Polymers / Q000737:chemistry; D016062:Porosity; D011817:Rabbits; D012038:Regeneration / Q000502:physiology; D013552:Swine; D054457:Tissue Scaffolds; D016896:Treatment Outcome
chemical_list: D011091:Polyesters; D011108:Polymers; D019344:Lactic Acid; C033616:poly(lactide); D003094:Collagen