title: Platelet-rich plasma enhances human osteoblast-like cell proliferation and differentiation.
abstract: OBJECTIVE
  Platelet-rich plasma (PRP) is widely used to promote tissue healing. However, there is no concrete evidence for the biological effects of PRP. This study evaluated the biological effects of PRP on the proliferation and differentiation of 2 human osteoblast-like cell lines.
  
  
  METHODS
  Human osteosarcoma cell lines HOS and SaOS-2 were used in this study. PRP was prepared from freshly drawn human venous blood containing a large number of platelets. The MTT assay was used to examine the effects of PRP on osteoblast viability. To evaluate the growth and differentiation, alkaline phosphatase activity was assessed and the expression of procollagen type I, osteopontin, and osteoprotegerin mRNA was measured using semiquantitative reverse transcriptase-polymerase chain reaction. Further, core binding factor alpha 1 (cbfa1/Runx2/AML3/PebpalphaA), a critical regulator of osteoblast differentiation, was also determined.
  
  
  RESULTS
  The administration of PRP enhanced the viability of HOS and SaOS-2 cells in a dose-dependent manner. Alkaline phosphatase activity was suppressed during the cell growth phase, but was strongly enhanced when the cells reached confluence. Semiquantitative reverse-transcription polymerase chain reaction analysis showed that PRP enhanced the levels of procollagen type I, osteopontin, osteoprotegerin, and core binding factor alpha 1 (cbfa1) mRNA.
  
  
  CONCLUSIONS
  These results suggest that PRP has a favorable effect on human osteoblast-like cells, and acts both to enhance bone regeneration and as an activator in wound healing.
authors.affiliation: Second Department of Oral and Maxillofacial Surgery, Kyushu Dental College, Fukuoka, Japan. tkanno@kyu-dent.ac.jp
authors.forename: Takahiro
authors.initials: T
authors.lastname: Kanno
authors.forename: Tetsu
authors.initials: T
authors.lastname: Takahashi
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Tsujisawa
authors.forename: Wataru
authors.initials: W
authors.lastname: Ariyoshi
authors.forename: Tatsuji
authors.initials: T
authors.lastname: Nishihara
mesh_terms: D000469:Alkaline Phosphatase / Q000032:analysis; D001792:Blood Platelets / Q000502:physiology*; D001861:Bone Regeneration; D002454:Cell Differentiation / Q000502:physiology; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D002470:Cell Survival / Q000502:physiology; D024042:Collagen Type I / Q000032:analysis; D004396:Coloring Agents; D050657:Core Binding Factor alpha Subunits; D004268:DNA-Binding Proteins / Q000032:analysis; D006023:Glycoproteins / Q000032:analysis; D006801:Humans; D010006:Osteoblasts / Q000502:physiology*; D053495:Osteopontin; D053244:Osteoprotegerin; D012516:Osteosarcoma / Q000473:pathology; D010750:Phosphoproteins / Q000032:analysis; D010949:Plasma; D018160:Receptors, Cytoplasmic and Nuclear / Q000032:analysis; D018124:Receptors, Tumor Necrosis Factor / Q000032:analysis; D012795:Sialoglycoproteins / Q000032:analysis; D013778:Tetrazolium Salts; D013844:Thiazoles; D014157:Transcription Factors / Q000032:analysis; D014945:Wound Healing
chemical_list: D024042:Collagen Type I; D004396:Coloring Agents; D050657:Core Binding Factor alpha Subunits; D004268:DNA-Binding Proteins; D006023:Glycoproteins; D053244:Osteoprotegerin; D010750:Phosphoproteins; D018160:Receptors, Cytoplasmic and Nuclear; D018124:Receptors, Tumor Necrosis Factor; C506895:SPP1 protein, human; D012795:Sialoglycoproteins; C506030:TNFRSF11B protein, human; D013778:Tetrazolium Salts; D013844:Thiazoles; D014157:Transcription Factors; C406688:core binding factor alpha; D053495:Osteopontin; D000469:Alkaline Phosphatase; C022616:thiazolyl blue