title: Effect of platelet-rich plasma on the in vitro proliferation and osteogenic differentiation of human mesenchymal stem cells on distinct calcium phosphate scaffolds: the specific surface area makes a difference.
abstract: The in vitro effect of platelet-rich plasma (PRP) on cell loading, proliferation, and osteogenic differentiation of human mesenchymal stem cells (MSC) is assessed on distinct resorbable and synthetic calcium phosphate scaffolds. A high specific surface area scaffold composed of calcium-deficient hydroxyapatite (CDHA; 48m2/g) is compared with one made out of beta-tricalcium phosphate (beta-TCP; surface area <0.5 m2/g). Fivefold concentrated fresh PRP is applied to scaffolds loaded with 2 x 10(5) MSC (n = 5). These constructs are kept in a medium with osteogenic supplements for 3 weeks. The addition of PRP leads to a higher cell loading efficiency of MSC on CDHA (p = 0.0001), that reaches the values of beta-TCP. Proliferation over 21 days is improved by PRP both on CDHA (p = 0.0001) and beta-TCP (p = 0.014) compared to MSC/calcium phosphate composites. Without the addition of PRP, CDHA has a lower cell loading efficiency (p= 0.0001) and proliferation (p= 0.001) than beta-TCP. The ALP activity is higher in the MSC/ceramics groups than in the monolayer controls (p<0.05). The addition of PRP does not significantly affect ALP activity. However, ALP activity varies considerably within the cell donors and different PRP-pools (p = 0.001), while the cell numbers do not vary within these two parameters. PRP generates a positive effect on the loading efficiency of MSC on the high specific surface scaffold CDHA that thereby reaches the loading efficiency of beta-TCP. PRP improved proliferation, but its osteogenic properties on both calcium phosphate scaffolds are weak.
authors.affiliation: Orthopaedic Surgery, University of Heidelberg, Schlierbacher Landstr. 200a 69118 Heidelberg, Germany. Philip.Kasten@gmx.de
authors.forename: Philip
authors.initials: P
authors.lastname: Kasten
authors.forename: Julia
authors.initials: J
authors.lastname: Vogel
authors.forename: Ingo
authors.initials: I
authors.lastname: Beyen
authors.forename: Stefan
authors.initials: S
authors.lastname: Weiss
authors.forename: Philipp
authors.initials: P
authors.lastname: Niemeyer
authors.forename: Albrecht
authors.initials: A
authors.lastname: Leo
authors.forename: Reto
authors.initials: R
authors.lastname: Lüginbuhl
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D018786:Bone Substitutes / Q000737:chemistry; D002130:Calcium Phosphates / Q000737:chemistry*; D018929:Cell Culture Techniques / Q000379:methods; D002454:Cell Differentiation; D049109:Cell Proliferation; D002478:Cells, Cultured; D006801:Humans; D008422:Materials Testing; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000502:physiology*; D010006:Osteoblasts / Q000166:cytology* / Q000502:physiology; D010012:Osteogenesis / Q000502:physiology*; D053657:Platelet-Rich Plasma / Q000378:metabolism*; D023822:Tissue Engineering / Q000379:methods*
chemical_list: D001672:Biocompatible Materials; D018786:Bone Substitutes; D002130:Calcium Phosphates; C020243:calcium phosphate