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

J Biomater Appl. 2008 Sep;23(2):169-88. doi: 10.1177/0885328207088269. Epub 2008 Jul 16.

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biocompatible Materials / chemistry*
  • Bone Substitutes / chemistry
  • Calcium Phosphates / chemistry*
  • Cell Culture Techniques / methods
  • Cell Differentiation
  • Cell Proliferation
  • Cells, Cultured
  • Humans
  • Materials Testing
  • Mesenchymal Stem Cells / cytology*
  • Mesenchymal Stem Cells / physiology*
  • Osteoblasts / cytology*
  • Osteoblasts / physiology
  • Osteogenesis / physiology*
  • Platelet-Rich Plasma / metabolism*
  • Tissue Engineering / methods*

Substances

  • Biocompatible Materials
  • Bone Substitutes
  • Calcium Phosphates
  • calcium phosphate