title: Microvascular maturity elicited in tissue treated with cytokine-loaded hyaluronan-based hydrogels.
abstract: Hydrogels composed of crosslinked, chemically modified hyaluronic acid (HA), gelatin (Gtn) and heparin (Hp) were preloaded with vascular endothelial growth factor (VEGF), angiopoietin-1 (Ang-1), keratinocyte growth factor (KGF) or platelet derived growth factor (PDGF) either individually or in combination with VEGF and implanted into the Balb/c mouse ear pinna. At 7 and 14 days post-surgery, elicited vascular maturity levels were quantified using immunohistochemical (IHC) staining techniques and reported as a vascular maturity index (VMI). At both time points, it was discovered that the dual cytokine combinations elicited greater maturity levels than that of cytokine administered individually. For example, VEGF and KGF-containing HA:Hp implants at day 7 yielded VMI values of -0.1375 and -0.092, respectively, whereas their combination resulted in a VMI of 0.176 (p<0.007). At day 7, only one of the seven HA:Hp experimental cases yielded a positive VMI (VEGF+KGF), whereas four of the seven HA:Hp cases yielded positive VMI values at day 14, indicating a sustained maturity response. The same general trends were found to exist in tissue treated with HA:Hp:Gtn experimental implants. Differences in elicited maturity also existed between tissue treated with HA:Hp and HA-containing hydrogels (VMI=0.176 for HA:Hp-VEGF+KGF vs. -0.064 for HA-VEGF+KGF, p<0.012), and these differences are thought to result from differences in characteristic cytokine release rates. This result also suggests that the presentation of multiple growth factors (GFs) on immobilized Hp may actively contribute to cytokine related signal transduction, a characteristic that may be exploited in the future to improve the efficacy of cytokine-loaded implants towards tissue regeneration therapeutic strategies.
authors.affiliation: Department of Chemical Engineering, Oregon State University, 102 Gleeson Hall, Corvallis, OR 97331-2702, United States. hosackl@onid.orst.edu
authors.forename: Luke W
authors.initials: LW
authors.lastname: Hosack
authors.forename: Matthew A
authors.initials: MA
authors.lastname: Firpo
authors.forename: J Anna
authors.initials: JA
authors.lastname: Scott
authors.forename: Glenn D
authors.initials: GD
authors.lastname: Prestwich
authors.forename: Robert A
authors.initials: RA
authors.lastname: Peattie
mesh_terms: D042683:Angiopoietin-1 / Q000494:pharmacology; D000818:Animals; D016207:Cytokines / Q000494:pharmacology*; D003692:Delayed-Action Preparations / Q000138:chemical synthesis / Q000737:chemistry*; D054644:Ear Auricle / Q000098:blood supply; D004730:Endothelium, Vascular / Q000187:drug effects / Q000254:growth & development; D051523:Fibroblast Growth Factor 7 / Q000494:pharmacology; D005780:Gelatin / Q000737:chemistry; D006493:Heparin / Q000737:chemistry; D006801:Humans; D006820:Hyaluronic Acid / Q000737:chemistry*; D020100:Hydrogels / Q000138:chemical synthesis / Q000737:chemistry*; D051379:Mice; D008807:Mice, Inbred BALB C; D008833:Microcirculation / Q000187:drug effects; D015394:Molecular Structure; D009131:Muscle, Smooth, Vascular / Q000187:drug effects / Q000254:growth & development; D018919:Neovascularization, Physiologic / Q000187:drug effects*; D010982:Platelet-Derived Growth Factor / Q000494:pharmacology; D011994:Recombinant Proteins / Q000494:pharmacology; D042461:Vascular Endothelial Growth Factor A / Q000494:pharmacology
chemical_list: C467630:ANGPT1 protein, human; D042683:Angiopoietin-1; D016207:Cytokines; D003692:Delayed-Action Preparations; D020100:Hydrogels; D010982:Platelet-Derived Growth Factor; D011994:Recombinant Proteins; C467484:VEGFA protein, human; D042461:Vascular Endothelial Growth Factor A; C075278:platelet-derived growth factor A; D051523:Fibroblast Growth Factor 7; D005780:Gelatin; D006820:Hyaluronic Acid; D006493:Heparin