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TGF-beta1 release from biodegradable polymer microparticles: its effects on marrow stromal osteoblast function
L Lu1, M J Yaszemski, A G Mikos
1Department of Bioengineering, Rice University, Houston, Texas, USA.
The Journal of Bone and Joint Surgery. American Volume
|April 21, 2001
Summary
Biodegradable microparticles effectively deliver transforming growth factor-beta1 (TGF-beta1) for bone regeneration. Released TGF-beta1 promotes marrow stromal cell proliferation and osteoblastic differentiation in vitro.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Cell Biology
Background:
- Controlled delivery of transforming growth factor-beta1 (TGF-beta1) is crucial for bone regeneration.
- Biodegradable polymer microparticles offer a promising approach for sustained TGF-beta1 release.
Purpose of the Study:
- To evaluate poly(DL-lactic-co-glycolic acid) (PLGA)/poly(ethylene glycol) (PEG) microparticles for controlled TGF-beta1 delivery.
- To assess the impact of released TGF-beta1 on marrow stromal cell proliferation and osteoblastic differentiation in vitro.
Main Methods:
- TGF-beta1 and FITC-BSA were encapsulated in PLGA/PEG microparticles with varying PEG content and buffer pH.
- In vitro release kinetics and PLGA degradation were monitored over 28 days.
- Marrow stromal cells on poly(propylene fumarate) substrates were cultured with released TGF-beta1 to assess proliferation and differentiation.
Main Results:
- PLGA/PEG microparticles exhibited multiphasic TGF-beta1 release, influenced by PEG content and pH.
- Higher PEG content reduced protein release; acidic pH accelerated PLGA degradation and protein aggregation.
- Released TGF-beta1 retained biological activity, enhancing marrow stromal cell proliferation and osteoblastic differentiation (increased cell number, alkaline phosphatase, and osteocalcin).
Conclusions:
- PLGA/PEG microparticles are effective carriers for controlled TGF-beta1 release.
- Sustained TGF-beta1 delivery promotes marrow stromal cell proliferation and osteoblastic differentiation, supporting bone regeneration applications.
