title: CD133: enhancement of bone healing by local transplantation of peripheral blood cells in a biologically delayed rat osteotomy model.
abstract: Sufficient angiogenesis is crucial during tissue regeneration and therefore also pivotal in bone defect healing. Recently, peripheral blood derived progenitor cells have been identified to have in addition to their angiogenic potential also osteogenic characteristics, leading to the hypothesis that bone regeneration could be stimulated by local administration of these cells. The aim of this study was to evaluate the angiogenic potential of locally administered progenitor cells to improve bone defect healing. Cells were separated from the peripheral blood of donor animals using the markers CD34 and CD133. Results of the in vitro experiments confirmed high angiogenic potential in the CD133(+) cell group. CD34(+) and CD133(+) cells were tested in an in vivo rat femoral defect model of delayed healing for their positive effect on the healing outcome. An increased callus formation and higher bone mineral density of callus tissue was found after the CD133(+) cell treatment compared to the group treated with CD34(+) cells and the control group without cells. Histological findings confirmed an increase in vessel formation and mineralization at day 42 in the osteotomy gap after CD133(+) cell transplantation. The higher angiogenic potential of CD133(+) cells from the in vitro experients therefore correlates with the in vivo data. This study demonstrates the suitability of angiogenic precursors to further bone healing and gives an indication that peripheral blood is a promising source for progenitor cells circumventing the problems associated with bone marrow extraction.
authors: Julius Wolff Institut and Center for Musculoskeletal Surgery, Charité - University Medicine Berlin, Berlin, Germany.
authors: Bernd
authors: B
authors: Preininger
authors: Georg
authors: G
authors: Duda
authors: Hinnerk
authors: H
authors: Gerigk
authors: Jonas
authors: J
authors: Bruckner
authors: Agnes
authors: A
authors: Ellinghaus
authors: F Andrea
authors: FA
authors: Sass
authors: Carsten
authors: C
authors: Perka
authors: Katharina
authors: K
authors: Schmidt-Bleek
authors: Anke
authors: A
authors: Dienelt
mesh_terms: D000071916:AC133 Antigen; D000818:Animals; D015703:Antigens, CD / Q000032:analysis*; D018952:Antigens, CD34 / Q000032:analysis; D001861:Bone Regeneration; D005260:Female; D005269:Femur / Q000098:blood supply* / Q000293:injuries* / Q000473:pathology / Q000502:physiology; D015870:Gene Expression; D006023:Glycoproteins / Q000032:analysis*; D061307:Human Umbilical Vein Endothelial Cells; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics; D007963:Leukocytes, Mononuclear / Q000166:cytology / Q000378:metabolism / Q000637:transplantation*; D018919:Neovascularization, Physiologic; D010455:Peptides / Q000032:analysis*; D051381:Rats; D017207:Rats, Sprague-Dawley; D014945:Wound Healing
chemical_list: D000071916:AC133 Antigen; D015703:Antigens, CD; D018952:Antigens, CD34; D006023:Glycoproteins; D036341:Intercellular Signaling Peptides and Proteins; C000606023:PROM1 protein, human; D010455:Peptides; C000606025:Prom1 protein, rat