title: Bioactivity assessment of PLLA/PCL/HAP electrospun nanofibrous scaffolds for bone tissue engineering.
abstract: OBJECTIVE
  The purpose of this paper was to fabricate PLLA/PCL nanofibrous scaffolds containing HAP to mimic the native bone extracellular matrix for potential applications as bone tissue engineering scaffolds materials and ultimately to help the repairing of bone defects.
  
  
  METHODS
  PLLA (MW 200kDa), PCL (MW 80kDa), HAP, dichloromethane, N,N-dimethylformamide; α-MEM, FBS, trypsin-EDTA, penicillin G, streptomycin, β-sodium glycerophosphate, l-ascorbic acid, dexamethasone; CCK-8, Alkaline Phosphatase Assay Kit, Mouse Osteocalcin ELISA Kit, MC3T3-E1 cells. PLLA, PCL and HAP were dissolved in the solution of DCM and DMF to fabricate nanofibrous scaffolds through electrospinning. The morphology of the scaffolds was investigated with SEM, while the diameter of the fibers, pore size and water uptake of the scaffolds were tested, respectively. TGA was carried out to verify the percentage of HAP in the composite scaffolds fabricated with different HAP concentrations. Cell count kit-8 assay, alkaline phosphatase (ALP) assay, and osteocalcin assay were applied to observe the MC3T3-E1 cells proliferation, differentiation on the composite scaffolds.
  
  
  RESULTS
  MC3T3-E1 cells were found to grow actively on the composite scaffolds based on the results of CCK-8 assay. The level of MC3T3-E1 differentiation was evaluated through the ALP activity and osteocalcin concentration, which showed higher value with HAP containing (PLLA/PCL/HAP) than that ones without (PLLA/PCL).
  
  
  CONCLUSIONS
  The results demonstrated that the biocomposite PLLA/PCL/HAP nanofibrous scaffold should be a promising candidate for proliferation, differentiation and mineralization of osteoblasts, and potentially can be used for bone tissue regeneration.
authors.affiliation: Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, People's Republic of China.
authors.forename: Hongfei
authors.initials: H
authors.lastname: Qi
authors.affiliation: Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, People's Republic of China.
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Ye
authors.affiliation: Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, People's Republic of China.
authors.forename: Hailong
authors.initials: H
authors.lastname: Ren
authors.affiliation: Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, People's Republic of China.
authors.forename: Nana
authors.initials: N
authors.lastname: Chen
authors.affiliation: Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, People's Republic of China.
authors.forename: Qingyan
authors.initials: Q
authors.lastname: Zeng
authors.affiliation: Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, People's Republic of China.
authors.forename: Xianglong
authors.initials: X
authors.lastname: Wu
authors.affiliation: Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, People's Republic of China. Electronic address: lutinglixinxin@nwpu.edu.cn.
authors.forename: Tingli
authors.initials: T
authors.lastname: Lu
mesh_terms: D016475:3T3 Cells; D000818:Animals; D001842:Bone and Bones / Q000187:drug effects* / Q000502:physiology; D049109:Cell Proliferation / Q000187:drug effects / Q000502:physiology; D004305:Dose-Response Relationship, Drug; D017886:Durapatite / Q000008:administration & dosage* / Q000737:chemistry; D008689:Methacrylates / Q000008:administration & dosage* / Q000737:chemistry; D051379:Mice; D057139:Nanofibers / Q000008:administration & dosage* / Q000737:chemistry; D010006:Osteoblasts / Q000187:drug effects / Q000502:physiology; D011091:Polyesters / Q000008:administration & dosage* / Q000737:chemistry; D023822:Tissue Engineering / Q000379:methods*; D054457:Tissue Scaffolds
chemical_list: D008689:Methacrylates; D011091:Polyesters; C499699:hydroxyapatite-polylactide; C507887:poly(epsilon-caprolactone) dimethacrylate; D017886:Durapatite
keywords: Bone tissue engineering; Electrospinning; Nanohydroxyapatite; Scaffold