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Delivering heparin-binding insulin-like growth factor 1 with self-assembling peptide hydrogels
Emily M Florine1, Rachel E Miller, Paul H Liebesny
11 Biological Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts.
Tissue Engineering. Part A
|September 19, 2014
Summary
Heparin-binding insulin-like growth factor 1 (HB-IGF-1) delivered via peptide hydrogels enhances cartilage matrix production. This approach shows promise for improving cartilage repair and integration in tissue engineering applications.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Achieving seamless integration between native and engineered cartilage is a significant challenge in cartilage repair.
- Heparin-binding insulin-like growth factor 1 (HB-IGF-1) demonstrates specific cartilage binding and promotes proteoglycan synthesis.
- Tissue engineering scaffolds offer a potential delivery system for growth factors to enhance cartilage regeneration.
Purpose of the Study:
- To investigate methods for adsorbing HB-IGF-1 onto self-assembling peptide hydrogels for controlled delivery.
- To evaluate the capacity of HB-IGF-1-loaded hydrogels to stimulate matrix synthesis in encapsulated chondrocytes and adjacent native cartilage.
- To assess the potential of this delivery system for improving cartilage integration and repair.
Main Methods:
- Developed self-assembling peptide hydrogels with adsorbed HB-IGF-1 using various methods, including pre-assembly and post-assembly adsorption, with and without heparan sulfate.
- Quantified the retention of HB-IGF-1 and heparan sulfate within the hydrogel matrix.
- Assessed matrix production by encapsulated chondrocytes and adjacent native cartilage explants using biochemical assays (sulfated glycosaminoglycan, hydroxyproline, proteoglycan synthesis).
Main Results:
- HB-IGF-1 and heparan sulfate were successfully retained in the peptide hydrogels under all tested conditions.
- Adsorption of HB-IGF-1 or IGF-1 prior to peptide assembly significantly increased sulfated glycosaminoglycan and hydroxyproline content in chondrocyte-seeded hydrogels.
- Cartilage explants adjacent to HB-IGF-1-loaded hydrogels exhibited increased proteoglycan synthesis, unlike those with IGF-1-loaded hydrogels.
Conclusions:
- Delivery of HB-IGF-1 using self-assembling peptide hydrogels is a viable strategy for cartilage tissue engineering.
- This method enhances matrix production by both engineered and native cartilage cells, promoting integration.
- HB-IGF-1-loaded hydrogels represent a promising approach for focal cartilage defect repair.
