Enzymatically degradable temperature-sensitive polypeptide as a new in-situ gelling biomaterial

Yuri Jeong, Min Kyung Joo, Kyung Hyun Bahk, Yun Young Choi, Ho Tae Kim, Won Ki Kim, Hwa Jeong Lee, Youn Soo Sohn, Byeongmoon Jeong

Research output: Contribution to journalArticle

97 Citations (Scopus)

Abstract

We are reporting a poly (ethylene glycol)-block-poly(alanine-co-phenyl alanine) (PEG-PAF) aqueous solution that undergoes sol-to-gel transition as the temperature increases. The sol-to-gel transition was observed at as low a concentration as 3.0-7.0 wt.%. Micellar aggregation accompanying small conformational changes of the peptide from random coils to β-sheets is suggested as the sol-to-gel transition mechanism of the PEG-PAF aqueous solution. The PEG-PAF is stable in phosphate buffered saline, however, it degraded in the subcutaneous layer of rats. In vitro study showed that proteolytic enzymes such as cathepsin B, cathepsin C, and elastase that are present in the subcutaneous layer of the mammalian tissue might be responsible for the degradation of the polymer in rats. As a feasibility study of this material, a single shot of an aqueous insulin formulation (13.8 mg insulin/kg) showed a hypoglycemic effect over 18 days in rats. The current functional polypeptide may be very promising as an in-situ gelling system for tissue engineering, cell/stem cell therapy, and drug delivery.

Original languageEnglish
Pages (from-to)25-30
Number of pages6
JournalJournal of Controlled Release
Volume137
Issue number1
DOIs
Publication statusPublished - 2009 Jul 1

Keywords

  • Enzymatic degradability
  • Hydrogel
  • Polymer
  • Polypeptide
  • Sol-gel transition

ASJC Scopus subject areas

  • Pharmaceutical Science

Fingerprint Dive into the research topics of 'Enzymatically degradable temperature-sensitive polypeptide as a new in-situ gelling biomaterial'. Together they form a unique fingerprint.

  • Cite this

    Jeong, Y., Joo, M. K., Bahk, K. H., Choi, Y. Y., Kim, H. T., Kim, W. K., Jeong Lee, H., Sohn, Y. S., & Jeong, B. (2009). Enzymatically degradable temperature-sensitive polypeptide as a new in-situ gelling biomaterial. Journal of Controlled Release, 137(1), 25-30. https://doi.org/10.1016/j.jconrel.2009.03.008