Format

Send to

Choose Destination
Acta Biomater. 2011 Mar;7(3):986-95. doi: 10.1016/j.actbio.2010.10.009. Epub 2010 Oct 20.

Development of nano- and microscale chondroitin sulfate particles for controlled growth factor delivery.

Author information

1
W.H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, 313 Ferst Drive, Atlanta, GA 30332, USA.

Abstract

Size scale plays an important role in the release properties and cellular presentation of drug delivery vehicles. Because negatively charged chondroitin sulfate (CS) is capable of electrostatically sequestering positively charged growth factors, CS-derived nanoscale micelles and microscale spheroids were synthesized as potential growth factor carriers to enhance differentiation of stem cells. Particles were characterized for morphology, size distribution, surface charge and cytocompatibility, as well as release of transforming growth factor-β1 (TGF-β1) and tumor necrosis factor-α (TNF-α). CS micelles were spherical and negatively charged with a bimodal distribution of 324.1±8.5 and 73.2±4.4 nm diameters, and CS microspheres possessed a rounded morphology and a diameter of 4.3±0.93 μm. Positively charged TGF-β1 demonstrated minimal release after loading in CS microspheres, while negatively charged TNF-α exhibited substantial release over the first 15 h, suggesting that TGF-β1 electrostatically complexed with CS. The micelles and microparticles were found to be cytocompatible at moderate concentrations with marrow stromal cell monolayers and within embryonic stem cell embryoid bodies. These synthesis techniques, which allow the formation of CS-based carriers over a variety of nano- and microscale sizes, offer versatility for tailored release of positively charged growth factors and controlled CS presentation for a variety of stem cell-based applications in tissue engineering and regenerative medicine.

PMID:
20965281
PMCID:
PMC3032265
DOI:
10.1016/j.actbio.2010.10.009
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Elsevier Science Icon for PubMed Central
Loading ...
Support Center