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In vitro delivery, cytotoxicity, swelling, and degradation behavior of a liquid‐to‐solid gelling polymer system for cerebral aneurysm embolization
Author(s) -
Brennecka Celeste R.,
Preul Mark C.,
Ver Brent L.
Publication year - 2012
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.32696
Subject(s) - degradation (telecommunications) , swelling , polymer , embolization , cytotoxicity , in vitro , materials science , biomedical engineering , chemistry , medicine , composite material , surgery , biochemistry , computer science , telecommunications
Abstract This study examines the in vitro characteristics of a crosslinking polymer system for cerebral aneurysm embolization. The polymeric material is composed of poly(propylene glycol)diacrylate (PPODA) and pentaerythritol tetrakis(3‐mercaptopropionate) (QT), formulated with the liquid contrast agents Conray™ or Omnipaque™ 300. The PPODA–QT system was tested for delivery feasibility through mock delivery into a model aneurysm. Cytotoxicity was performed by exposing 3T3 cells to gel formulations, followed by a cell viability assay. Swelling was measured on samples submerged in 150 m M phosphate buffered saline at 37 or 50°C. The same samples underwent compression testing to assess degradation, characterized by reduction in Young's modulus over time. The PPODA–QT system was easily deliverable to mock aneurysms. Cytotoxicity results indicated that Conray‐formulated gels are initially less toxic than Omnipaque‐formulated gels, but show greater susceptibility to swelling and degradation over time. In general, these experiments represented more challenging conditions than would be present in vivo , and therefore, reported results are likely overestimations of in vivo outcomes. However, these results highlight potential issues with each PPODA–QT formulation. Given the desired outcome of neointimal tissue growth over the polymer material, initial cytotoxicity may be more important than long‐term factors when choosing an optimal formulation for aneurysm embolization. © 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 2012.