Injected biodegradable polyurethane scaffolds support tissue infiltration and delay wound contraction in a porcine excisional model.
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.
Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee.
Elizabeth J
EJ
Adolph
Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee.
Ruijing
R
Guo
Department of Plastic Surgery, Vanderbilt University Medical Center, Nashville, Tennessee.
Alonda C
AC
Pollins
Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee.
Katarzyna
K
Zienkiewicz
Department of Plastic Surgery, Vanderbilt University Medical Center, Nashville, Tennessee.
Nancy
N
Cardwell
Research Service, VA Tennessee Valley Healthcare System, Nashville, Tennessee.|Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee.
Jeffrey M
JM
Davidson
Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee.|Department of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee.|Center for Bone Biology, Vanderbilt University Medical Center, Nashville, Tennessee.
Scott A
SA
Guelcher
Department of Plastic Surgery, Vanderbilt University Medical Center, Nashville, Tennessee. Lillian.nanney@vanderbilt.edu.|Department of Cell & Developmental Biology, Vanderbilt University Medical Center, Nashville, Tennessee. Lillian.nanney@vanderbilt.edu.
Lillian B
LB
Nanney
D020341:Absorbable Implants; D000818:Animals; D063566:Biodegradable Plastics / Q000737:chemistry / Q000494:pharmacology; D004195:Disease Models, Animal; D011140:Polyurethanes / Q000737:chemistry / Q000494:pharmacology; D013552:Swine; D054457:Tissue Scaffolds / Q000737:chemistry*; D014945:Wound Healing / Q000187:drug effects*; D014947:Wounds and Injuries / Q000473:pathology / Q000628:therapy*
D063566:Biodegradable Plastics; D011140:Polyurethanes
biodegradable; polyurethane scaffold; porcine model; wound contraction; wound repair