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Injected biodegradable polyurethane scaffolds support tissue infiltration and delay wound contraction in a porcine excisional model.

Authors
  • Adolph, Elizabeth J1
  • Guo, Ruijing1
  • Pollins, Alonda C2
  • Zienkiewicz, Katarzyna1
  • Cardwell, Nancy2
  • Davidson, Jeffrey M3, 4
  • Guelcher, Scott A1, 5, 6
  • Nanney, Lillian B7, 8
  • 1 Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee.
  • 2 Department of Plastic Surgery, Vanderbilt University Medical Center, Nashville, Tennessee.
  • 3 Research Service, VA Tennessee Valley Healthcare System, Nashville, Tennessee.
  • 4 Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee.
  • 5 Department of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee.
  • 6 Center for Bone Biology, Vanderbilt University Medical Center, Nashville, Tennessee.
  • 7 Department of Plastic Surgery, Vanderbilt University Medical Center, Nashville, Tennessee. [email protected]
  • 8 Department of Cell & Developmental Biology, Vanderbilt University Medical Center, Nashville, Tennessee. [email protected]
Type
Published Article
Journal
Journal of Biomedical Materials Research Part B Applied Biomaterials
Publisher
Wiley (John Wiley & Sons)
Publication Date
Nov 01, 2016
Volume
104
Issue
8
Pages
1679–1690
Identifiers
DOI: 10.1002/jbm.b.33515
PMID: 26343927
Source
Medline
Keywords
License
Unknown

Abstract

The filling of wound cavities with new tissue is a challenge. We previously reported on the physical properties and wound healing kinetics of prefabricated, gas-blown polyurethane (PUR) scaffolds in rat and porcine excisional wounds. To address the capability of this material to fill complex wound cavities, this study examined the in vitro and in vivo reparative characteristics of injected PUR scaffolds employing a sucrose porogen. Using the porcine excisional wound model, we compared reparative outcomes to both preformed and injected scaffolds as well as untreated wounds at 9, 13, and 30 days after scaffold placement. Both injected and preformed scaffolds delayed wound contraction by 19% at 9 days and 12% at 13 days compared to nontreated wounds. This stenting effect proved transient since both formulations degraded by day 30. Both types of scaffolds significantly inhibited the undesirable alignment of collagen and fibroblasts through day 13. Injected scaffolds were highly compatible with sentinel cellular events of normal wound repair cell proliferation, apoptosis, and blood vessel density. The present study provides further evidence that either injected or preformed PUR scaffolds facilitate wound healing, support tissue infiltration and matrix production, delay wound contraction, and reduce scarring in a clinically relevant animal model, which underscores their potential utility as a void-filling platform for large cutaneous defects. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 104B: 1679-1690, 2016.

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