title: Preparation of BMP-2 containing bovine serum albumin (BSA) nanoparticles stabilized by polymer coating.
abstract: OBJECTIVE
  The purpose of this study was to investigate the preparation process of bone morphogenetic protein-2 (BMP-2) containing bovine serum albumin (BSA) nanoparticles (NPs), and to assess the bioactivity of BMP-2 encapsulated in such NPs.
  
  
  METHODS
  The NPs were prepared by a coacervation method, and the effects of process parameters on NP size and polydispersity were examined. Polymer coated NPs were characterized with respect to amount of adsorbed polymer, particle size and zeta potential. Using bone marrow stromal cells (BMSC), biocompatibility of the NPs was investigated by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide (MTT) Assay, and bioactivity of the encapsulated BMP-2 was investigated by alkaline phosphatase (ALP) induction and calcification.
  
  
  RESULTS
  The size of NPs could be controlled in the 50-400 nm range by process parameters including BSA concentration, non-solvent:solvent ratio and pH value. After coating with cationic polymers, the particle size and zeta potential were significantly increased. MTT assay indicated no toxicity of both the uncoated and coated NPs on BMSC. Based on ALP induction and calcification, full retention of BMP-2 bioactivity was retained in the polymer-coated NPs.
  
  
  CONCLUSIONS
  This study described a preparation procedure for BSA NPs with controllable particle size, and such polymer-coated BSA NPs are promising delivery agents for local and systemic administration of BMP-2 in bone regeneration.
authors: Department of Chemical and Materials Engineering, Faculty of Engineering, University of Alberta, Edmonton, Alberta, Canada.
authors: Guilin
authors: G
authors: Wang
authors: Kevin
authors: K
authors: Siggers
authors: Sufeng
authors: S
authors: Zhang
authors: Hongxing
authors: H
authors: Jiang
authors: Zhenghe
authors: Z
authors: Xu
authors: Ronald F
authors: RF
authors: Zernicke
authors: John
authors: J
authors: Matyas
authors: Hasan
authors: H
authors: Uludağ
mesh_terms: D000096:Acetone / Q000737:chemistry; D000818:Animals; D055396:Bone Morphogenetic Protein 2 / Q000737:chemistry*; D016503:Drug Delivery Systems; D004355:Drug Stability; D006801:Humans; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D011094:Polyethyleneimine / Q000737:chemistry; D011107:Polylysine / Q000737:chemistry; D051381:Rats; D012710:Serum Albumin, Bovine / Q000737:chemistry*
chemical_list: D055396:Bone Morphogenetic Protein 2; D000096:Acetone; D011107:Polylysine; D012710:Serum Albumin, Bovine; D011094:Polyethyleneimine