title: Growth of mesenchymal stem cells on electrospun type I collagen nanofibers.
abstract: We reconstituted type I collagen nanofibers prepared by electrospin technology and examined the morphology, growth, adhesion, cell motility, and osteogenic differentiation of human bone marrow-derived mesenchymal stem cells (MSCs) on three nano-sized diameters (50-200, 200-500, and 500-1,000 nm). Results from scanning electron microscopy showed that cells on the nanofibers had a more polygonal and flattened cell morphology. MTS (3-[4,5-dimethythiazol-2-yl]-5-[3-carboxy-methoxyphenyl]-2-[4-sul-fophenyl]-2H-tetrazolium compound) assay demonstrated that the MSCs grown on 500-1,000-nm nanofibers had significantly higher cell viability than the tissue culture polystyrene control. A decreased amount of focal adhesion formation was apparent in which quantifiable staining area of the cytoplasmic protein vinculin for the 200-500-nm nanofibers was 39% less compared with control, whereas the area of quantifiable vinculin staining was 45% less for both the 200-500-nm and 500-1,000-nm nanofibers. The distances of cell migration were quantified on green fluorescent protein-nucleofected cells and was 56.7%, 37.3%, and 46.3% for 50-200, 200-500, and 500-1,000 nm, respectively, compared with those on the control. Alkaline phosphatase activity demonstrated no differences after 12 days of osteogenic differentiation, and reverse transcription-polymerase chain reaction (RT-PCR) analysis showed comparable osteogenic gene expression of osteocalcin, osteonectin, and ostepontin between cells differentiated on polystyrene and nanofiber surfaces. Moreover, single-cell RT-PCR of type I collagen gene expression demonstrated higher expression on cells seeded on the nanofibers. Therefore, type I collagen nanofibers support the growth of MSCs without compromising their osteogenic differentiation capability and can be used as a scaffold for bone tissue engineering to facilitate intramembranous bone formation. Further efforts are necessary to enhance their biomimetic properties.
authors.affiliation: Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan.
authors.forename: Yu-Ru V
authors.initials: YR
authors.lastname: Shih
authors.forename: Chung-Nan
authors.initials: CN
authors.lastname: Chen
authors.forename: Shiao-Wen
authors.initials: SW
authors.lastname: Tsai
authors.forename: Yng Jiin
authors.initials: YJ
authors.lastname: Wang
authors.forename: Oscar K
authors.initials: OK
authors.lastname: Lee
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D001854:Bone Marrow Cells / Q000187:drug effects* / Q000378:metabolism; D002448:Cell Adhesion / Q000187:drug effects; D002454:Cell Differentiation / Q000187:drug effects; D002465:Cell Movement / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects*; D048430:Cell Shape / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D024042:Collagen Type I / Q000737:chemistry / Q000494:pharmacology*; D005069:Evaluation Studies as Topic; D022001:Focal Adhesions / Q000187:drug effects; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D059630:Mesenchymal Stem Cells / Q000187:drug effects* / Q000378:metabolism; D049329:Nanostructures; D010006:Osteoblasts / Q000187:drug effects* / Q000378:metabolism; D015675:Osteocalcin / Q000235:genetics / Q000378:metabolism; D010012:Osteogenesis / Q000502:physiology; D015676:Osteonectin / Q000235:genetics / Q000378:metabolism; D053495:Osteopontin / Q000235:genetics / Q000378:metabolism; D010316:Particle Size; D012333:RNA, Messenger / Q000378:metabolism; D023822:Tissue Engineering / Q000379:methods
chemical_list: D024042:Collagen Type I; D015676:Osteonectin; D012333:RNA, Messenger; D015675:Osteocalcin; D053495:Osteopontin; D000469:Alkaline Phosphatase