Dual growth factor delivery from degradable oligo(poly(ethylene glycol) fumarate) hydrogel scaffolds for cartilage tissue engineering
- 作者：Holland ; Theresa A. ; Tabata ; Yasuhiko ; Mikos ; Antonios G.
- 关键词：CC-PBS ; collagenase-containing phosphate buffered saline ; GA ; glutaraldehyde ; H ; oligo(poly(ethylene glycol) fumarate) hydrogel phase of composites ; IEP ; isoelectric point ; IGF-1 ; insulin-like growth factor-1 ; MPs ; microparticles ; OPF ; oligo(poly(ethylene
- 刊名：Journal of Controlled Release
- 出版年：2005
- 期刊代码：25_01683659
- 类别：pha
- 出版时间：January 3, 2005
- 卷：101
- 期：1-3
- 页码：111-125
- 文件大小：547 K
摘要
This work describes the development of a non-invasive means of simultaneously delivering insulin-like growth factor-1 (IGF-1) and transforming growth factor-脦脦1 (TGF-脦脦1) to injured cartilage tissue in a controlled manner. This novel delivery technology employs the water-soluble polymer, oligo(poly(ethylene glycol) fumarate) (OPF), in the fabrication of biodegradable hydrogels which encapsulate gelatin microparticles. Release studies first examined the effect of gelatin isoelectric point (IEP) and crosslinking extent on IGF-1 release from these microparticles. In the presence of collagenase, highly crosslinked, acidic gelatin (IEP=5.0) provided sustained release of IGF-1, 95.2脦脦2.9%cumulative release at day 28, while less crosslinked microparticles and microparticles of alternate IEP exhibited similar release values after only 6 days. Encapsulation of these highly crosslinked microparticles in a network of OPF provided a means to further control release, reducing final cumulative release to 70.2脦脦4.7%in collagenase-containing PBS. Final release values from OPF脦脦脦gelatin microparticle composites could be altered by incorporating less crosslinked, non-loaded microparticles within these constructs. Finally, this technology was extended to the dual delivery of IGF-1 and TGF-脦脦1 by loading these growth factors into either the OPF hydrogel phase or gelatin microparticle phase of composites. Release profiles were successfully manipulated by altering the phase of growth factor loading and microparticle crosslinking extent. For instance, by loading TGF-脦脦1 into the gelatin microparticle phase, a burst release of 10.8脦脦0.7%was achieved, while loading this growth factor into the OPF hydrogel phase resulted in a burst release of 25.2脦脦1.5%. With either system, simultaneous, slow release of IGF-1 over a 4-week period was accomplished by selectively loading this protein into highly crosslinked, encapsulated microparticles. These results demonstrate the utility of these systems in future studies to assess the interplay and time course of multiple growth factors in cartilage repair.