In situ characterization of the degradation of PLGA microspheres in hyaluronic acid hydrogels by optical coherence tomography

Jennifer Patterson, Patrick S. Stayton, Xingde Li

Research output: Contribution to journalArticle

Abstract

The polymeric implant material poly(lactide-co-glycolide) (PLGA) degrades by a process of bulk degradation, which allows it to be used for the controlled release of therapeutic molecules from implants and microspheres. The temporal characterization of PLGA microsphere degradation has been limited by the need to destructively monitor the samples at each time point. In this study, a noninvasive imaging technology, optical coherence tomography (OCT), was utilized to characterize the in situ degradation of PLGA microspheres suspended within photo-crosslinked hyaluronic acid (HA) hydrogels. Microspheres with differing degradation rates were loaded with bovine serum albumin (BSA) as a marker protein, and temporal release of protein was correlated with morphological changes observed during 3-D OCT imaging. As proof-of-principle, a microsphere-loaded hydrogel scaffold was implanted in a modified rat calvarial critical size defect model and imaged using OCT. This animal model presents the opportunity to monitor microsphere degradation over time in living animals.

Original languageEnglish (US)
Article number4556633
Pages (from-to)74-81
Number of pages8
JournalIEEE transactions on medical imaging
Volume28
Issue number1
DOIs
StatePublished - Jan 1 2009
Externally publishedYes

Keywords

  • Optical coherence tomography (OCT)

ASJC Scopus subject areas

  • Software
  • Radiological and Ultrasound Technology
  • Computer Science Applications
  • Electrical and Electronic Engineering

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