title: Efficacy of stem cells on periodontal regeneration: Systematic review of pre-clinical studies.
abstract: This systematic review aims to evaluate mesenchymal stem cells (MSC) periodontal regenerative potential in animal models. MEDLINE, EMBASE and LILACS databases were searched for quantitative pre-clinical controlled animal model studies that evaluated the effect of local administration of MSC on periodontal regeneration. The systematic review was conducted according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement guidelines. Twenty-two studies met the inclusion criteria. Periodontal defects were surgically created in all studies. In seven studies, periodontal inflammation was experimentally induced following surgical defect creation. Differences in defect morphology were identified among the studies. Autogenous, alogenous and xenogenous MSC were used to promote periodontal regeneration. These included bone marrow-derived MSC, periodontal ligament (PDL)-derived MSC, dental pulp-derived MSC, gingival margin-derived MSC, foreskin-derived induced pluripotent stem cells, adipose tissue-derived MSC, cementum-derived MSC, periapical follicular MSC and alveolar periosteal cells. Meta-analysis was not possible due to heterogeneities in study designs. In most of the studies, local MSC implantation was not associated with adverse effects. The use of bone marrow-derived MSC for periodontal regeneration yielded conflicting results. In contrast, PDL-MSC consistently promoted increased PDL and cementum regeneration. Finally, the adjunct use of MSC improved the regenerative outcomes of periodontal defects treated with membranes or bone substitutes. Despite the quality level of the existing evidence, the current data indicate that the use of MSC may provide beneficial effects on periodontal regeneration. The various degrees of success of MSC in periodontal regeneration are likely to be related to the use of heterogeneous cells. Thus, future studies need to identify phenotypic profiles of highly regenerative MSC populations.
authors.affiliation: Division of Periodontics, Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil.
authors.forename: S A
authors.initials: SA
authors.lastname: Tassi
authors.affiliation: Division of Periodontics, Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil.
authors.forename: N Z
authors.initials: NZ
authors.lastname: Sergio
authors.affiliation: Division of Periodontics, Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil.
authors.forename: M Y O
authors.initials: MYO
authors.lastname: Misawa
authors.affiliation: Division of Periodontics, Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil.|Department of Periodontics, University of Texas Health Science Center at San Antonio Dental School, San Antonio, TX, USA.
authors.forename: C C
authors.identifier: http://orcid.org/0000-0002-5905-5079
authors.initials: CC
authors.lastname: Villar
mesh_terms: D000818:Animals; D001861:Bone Regeneration; D018786:Bone Substitutes; D016025:Bone Transplantation; D025021:Cementogenesis / Q000502:physiology; D016208:Databases, Factual; D003782:Dental Pulp / Q000166:cytology; D004195:Disease Models, Animal; D016557:Guided Tissue Regeneration, Periodontal / Q000379:methods*; D006801:Humans; D059630:Mesenchymal Stem Cells; D015201:Meta-Analysis as Topic; D010012:Osteogenesis / Q000502:physiology; D010513:Periodontal Ligament / Q000502:physiology; D012038:Regeneration / Q000502:physiology*; D033581:Stem Cell Transplantation; D054457:Tissue Scaffolds
chemical_list: D018786:Bone Substitutes
keywords: cell biology; experimental periodontitis; periodontal regeneration; systematic reviews and evidence-based medicine