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In vitro BMP-2 peptide release from thiolated chitosan based hydrogel
Xujie Liu1, Bo Yu2, Qianli Huang3
1Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
International Journal of Biological Macromolecules
|August 22, 2016
Summary
Thiolated chitosan hydrogels offer enhanced delivery of cysteine-rich peptides. This study shows CS-TBA hydrogels improve peptide release for potential bone repair applications.
Area of Science:
- Biomaterials Science
- Drug Delivery Systems
- Tissue Engineering
Background:
- Thiolated chitosan hydrogels are water-soluble systems with thiol groups beneficial for delivering cysteine-rich peptides.
- Chitosan-4-thio-butylamidine (CS-TBA) conjugate was developed for creating advanced hydrogels.
- Peptide 24 (P24), a cysteine-terminated peptide from BMP-2, was synthesized for delivery.
Purpose of the Study:
- To characterize CS-TBA and prepare a thermo-sensitive hydrogel using CS-TBA, hydroxyapatite (HA), and beta-glycerophosphate disodium (β-GP).
- To investigate the in vitro release behavior of P24 from the CS-TBA based hydrogel.
- To evaluate the potential of this hydrogel system for bone repair applications.
Main Methods:
- Synthesis and characterization of chitosan-4-thio-butylamidine (CS-TBA) conjugate.
- Preparation of CS-TBA/hydroxyapatite (HA)/beta-glycerophosphate disodium (β-GP) thermo-sensitive hydrogel.
- In vitro release studies of cysteine-terminated peptide 24 (P24) from the hydrogel.
- Assessment of P24 bioactivity post-release.
Main Results:
- The CS-TBA based hydrogel demonstrated thermo-sensitive properties.
- Thiol groups in CS-TBA potentially reacted with thiol groups in P24, slowing peptide release.
- Sustained release of P24 was observed over a longer period compared to unmodified chitosan hydrogels.
- The bioactivity of P24 was maintained during the release process.
Conclusions:
- CS-TBA based thermo-sensitive hydrogels provide a promising platform for sustained peptide delivery.
- The developed hydrogel system preserves peptide bioactivity, crucial for therapeutic efficacy.
- This CS-TBA hydrogel holds potential as a biomaterial for minimally invasive bone repair surgery.
