Functionalization of multilayered DNA-coatings with bone morphogenetic protein 2

J Control Release. 2006 Jun 12;113(1):63-72. doi: 10.1016/j.jconrel.2006.03.016. Epub 2006 Apr 5.

Abstract

The focus of the present study was to functionalize multilayered DNA-coatings with the osteoinductive factor bone morphogenetic protein 2 (BMP-2) using different loading modalities. The multilayered DNA-coatings were built up from either poly-d-lysine (PDL) or poly(allylamine hydrochloride) (PAH) and DNA using electrostatic self-assembly (ESA). The amounts of BMP-2 loaded into the multilayered DNA-coatings and its subsequent release characteristics were determined using radiolabeled BMP-2. Additionally, the effect of BMP-2 functionalized multilayered DNA-coatings on the in vitro behavior of bone marrow-derived osteoblast-like cells was evaluated in terms of proliferation, differentiation, mineralization, and cell morphology. The results demonstrate the feasibility of multilayered DNA-coatings to be functionalized by embedding BMP-2 according to three different loading modalities: superficial (s), deep (d), and double-layer (dl). BMP-2 was incorporated proportionally into the multilayered DNA-coatings as: s+(4*d)=dl. All differently loaded multilayered DNA-coatings showed an initial burst release followed by an incremental sustained release of the remaining BMP-2. In vitro experiments demonstrated that the loaded factor remained biologically active, as an accelerated calcium deposition was observed on s- and dl-loaded multilayered DNA-coatings, without affecting cell proliferation. In contrast, d-loaded multilayered DNA-coatings influenced osteoblast-like cell behavior by decreasing the deposition of calcium.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkaline Phosphatase / analysis
  • Alkaline Phosphatase / metabolism
  • Animals
  • Bone Marrow Cells / cytology*
  • Bone Morphogenetic Protein 2
  • Bone Morphogenetic Proteins / genetics
  • Bone Morphogenetic Proteins / metabolism*
  • Bone Morphogenetic Proteins / physiology
  • Calcification, Physiologic / physiology
  • Cell Differentiation
  • Cell Proliferation
  • Cells, Cultured
  • Coated Materials, Biocompatible / chemistry*
  • DNA / chemistry*
  • DNA / ultrastructure
  • Feasibility Studies
  • Humans
  • Iodine Radioisotopes / metabolism
  • Male
  • Osteoblasts / cytology*
  • Osteoblasts / physiology
  • Osteoblasts / ultrastructure
  • Rats
  • Rats, Wistar
  • Recombinant Proteins / metabolism
  • Time Factors
  • Transforming Growth Factor beta / genetics
  • Transforming Growth Factor beta / metabolism*
  • Transforming Growth Factor beta / physiology

Substances

  • BMP2 protein, human
  • Bmp2 protein, rat
  • Bone Morphogenetic Protein 2
  • Bone Morphogenetic Proteins
  • Coated Materials, Biocompatible
  • Iodine Radioisotopes
  • Recombinant Proteins
  • Transforming Growth Factor beta
  • DNA
  • Alkaline Phosphatase