title: Enhanced periodontal tissue regeneration by periodontal cell implantation.
abstract: OBJECTIVE
  Due to a lack of regenerative potential, current treatments for periodontal defects do not always provide satisfactory clinical results. Previously, the implantation of a biomaterial scaffold-cell construct has been suggested as a clinically achievable approach. In this study, it was aimed to investigate the contribution of implanted periodontal ligament (PDL) cells to periodontal tissue regeneration.
  
  
  METHODS
  Gelatin sponges were seeded with green fluorescent protein (GFP) transfected PDL or gingival fibroblasts (GF) cells, and implanted into a surgically created rat intrabony periodontal defect model. After six weeks, decalcified maxillae were used for histomorphometrical and immunohistochemical analyses.
  
  
  RESULTS
  After six weeks, animals that had received the PDL cells exhibited significantly more functional bone and ligament. Furthermore, there were remarkable differences in the distribution of the transplanted cells. Periodontal ligament cells were always located directly lining the newly regenerated areas. In contrast, GF cells dispersed over the whole defect area, and did not provide a favourable effect on the regeneration of the periodontal tissues.
  
  
  CONCLUSIONS
  We concluded that PDL cells transplanted into a periodontal defect survive and favour regeneration of periodontium, possibly in a paracrine manner.
authors.affiliation: Department of Biomaterials, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
authors.forename: Na
authors.initials: N
authors.lastname: Yu
authors.forename: Daniel A W
authors.initials: DA
authors.lastname: Oortgiesen
authors.forename: Antonius L J J
authors.initials: AL
authors.lastname: Bronckers
authors.forename: Fang
authors.initials: F
authors.lastname: Yang
authors.forename: X Frank
authors.initials: XF
authors.lastname: Walboomers
authors.forename: John A
authors.initials: JA
authors.lastname: Jansen
mesh_terms: D016301:Alveolar Bone Loss / Q000601:surgery; D000818:Animals; D001861:Bone Regeneration / Q000502:physiology; D002448:Cell Adhesion / Q000502:physiology; D018929:Cell Culture Techniques; D048430:Cell Shape / Q000502:physiology; D002470:Cell Survival / Q000502:physiology; D005347:Fibroblasts / Q000637:transplantation*; D005781:Gelatin Sponge, Absorbable / Q000737:chemistry; D005881:Gingiva / Q000166:cytology; D049452:Green Fluorescent Proteins; D016557:Guided Tissue Regeneration, Periodontal / Q000379:methods*; D049408:Luminescent Agents; D008437:Maxilla / Q000601:surgery; D010012:Osteogenesis / Q000502:physiology; D010513:Periodontal Ligament / Q000166:cytology*; D051381:Rats; D011923:Rats, Nude; D017207:Rats, Sprague-Dawley; D055647:Rats, Transgenic; D023822:Tissue Engineering / Q000379:methods; D054457:Tissue Scaffolds / Q000737:chemistry
chemical_list: D049408:Luminescent Agents; D049452:Green Fluorescent Proteins