title: HB-EGF embedded in PGA/PLLA scaffolds via subcritical CO2 augments the production of tissue engineered intestine.
abstract: The ability to deliver sustained-release, biologically active growth factors through custom designed tissue engineering scaffolds at sites of tissue regeneration offers great therapeutic opportunity. Due to the short in vivo half-lives of most growth factors, it is challenging to deliver these proteins to sites of interest where they may be used before being degraded. The application of subcritical CO2 uses gas-phase CO2 at subcritical pressures ranging from 41 to 62 bar (595-913 PSI) which avoids foaming by reducing the amount of CO2 dissolved in the polymer and maintains completely reversible plasticization. In the current study, heparin-binding EGF-like growth factor (HB-EGF) was embedded into polyglycolic acid (PGA)/Poly-l-latic acid (PLLA) scaffolds via subcritical CO2 exposure for the production of tissue engineered intestine (TEI). PGA fiber morphology after subcritical CO2 exposure was examined by scanning electron microscopy (SEM) and the distribution of HB-EGF embedded in the scaffold fibers was detected by HB-EGF immunofluorescent staining. In vivo implantation of HB-EGF-embedded scaffolds confirmed significantly improved TEI structure as a result of local delivery of the trophic growth factor. These findings may be critical for the production of TEI in the treatment of patients with short bowel syndrome in the future.
authors.affiliation: Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, and the Department of Pediatric Surgery, Columbus, OH, USA.
authors.forename: Yanchun
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA.
authors.forename: Tyler
authors.initials: T
authors.lastname: Nelson
authors.affiliation: Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, and the Department of Pediatric Surgery, Columbus, OH, USA.
authors.forename: Barrett
authors.initials: B
authors.lastname: Cromeens
authors.affiliation: Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, and the Department of Pediatric Surgery, Columbus, OH, USA.
authors.forename: Terrence
authors.initials: T
authors.lastname: Rager
authors.affiliation: Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, USA.
authors.forename: John
authors.initials: J
authors.lastname: Lannutti
authors.affiliation: Nanofiber Solutions, Inc., Columbus, OH, USA.
authors.forename: Jed
authors.initials: J
authors.lastname: Johnson
authors.affiliation: Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, and the Department of Pediatric Surgery, Columbus, OH, USA. Electronic address: gail.besner@nationwidechildrens.org.
authors.forename: Gail E
authors.initials: GE
authors.lastname: Besner
mesh_terms: D000818:Animals; D002245:Carbon Dioxide / Q000737:chemistry*; D003692:Delayed-Action Preparations / Q000008:administration & dosage / Q000737:chemistry; D004867:Equipment Design; D066257:Heparin-binding EGF-like Growth Factor / Q000008:administration & dosage* / Q000737:chemistry; D007422:Intestines / Q000166:cytology / Q000187:drug effects / Q000254:growth & development*; D009924:Organ Culture Techniques / Q000295:instrumentation / Q000379:methods; D011091:Polyesters / Q000737:chemistry*; D011100:Polyglycolic Acid / Q000737:chemistry*; D051381:Rats; D011917:Rats, Inbred Lew; D023822:Tissue Engineering / Q000295:instrumentation* / Q000379:methods; D054457:Tissue Scaffolds
chemical_list: D003692:Delayed-Action Preparations; D066257:Heparin-binding EGF-like Growth Factor; D011091:Polyesters; D002245:Carbon Dioxide; D011100:Polyglycolic Acid; C033616:poly(lactide)
keywords: HB-EGF; Intestine; Polyglycolic acid; Stem cell; Tissue engineering