Apatite-Polymer Composite Particles for Controlled Delivery of BMP-2
Name
MEBCS001.pdf
Size
329.61 KB
Format
Adobe PDF
Checksum (MD5)
c560d394b20555095dba73b78a57c85d
Author(s)
Yong, Tseh-Hwan
Hager, Elizabeth A.
Ying, Jackie Y.
Date Issued
January 2004
Series/Report no.
Molecular Engineering of Biological and Chemical Systems (MEBCS);
Abstract
We have developed a versatile delivery platform comprising a novel composite of two biomaterials with proven track records: apatite and poly(lactic-co-glycolic acid) (PLGA). These composites have been tested in the delivery of a model protein, bovine serum albumin (BSA), as well as a growth factor, bone morphogenetic protein-2 (BMP-2), which is a potent inducer of bone formation. The controlled release strategy is based on the use of a polymer with acidic degradation products to control the dissolution of a basic inorganic component, resulting in protein release. The release profile can be modified systematically by changing variables that affect polymer degradation and/or apatite dissolution, such as polymer molecular weight, polymer composition, apatite loading, and apatite particle size. We have found that an increase in polymer molecular weight and polymer hydrophobicity led to slower polymer degradation, and in turn, slower apatite dissolution and protein release. Protein release was enhanced by reducing apatite particle size and by lowering the apatite content in the composites. We anticipate that this delivery platform can be extended to the controlled release of other therapeutic proteins and chemicals.
Subjects
composite
apatite
PLGA
bone morphogenetic protein
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