Biodegradable hyaluronan hydrogel coatings on acellular dermis grafts—A potential strategy to improve biologic graft durability in hernia repair application

Abstract

Biologic grafts used in hernia repair undergo rapid cellular infiltration and remodeling, but their premature degradation often results in hernia recurrence. We hypothesize that a temporary barrier that prevents infiltration of acute inflammatory cells into the graft during the initial 4 weeks of implantation could mitigate graft degradation. The purpose of this study is to design tyramine‐substituted hyaluronan (THA) hydrogel coatings with tunable degradation properties, as a means to develop a resorbable barrier for human acellular dermis grafts (HADM). THA plugs prepared at different cross‐linking densities, by varying cross‐linking agent concentration (0.0001–0.0075% H2O2), demonstrated varying rates of in vitro degradation (25 U/mL hyaluronidase, 48 h). Based on these results, HADM grafts were coated with THA at three cross‐linking densities (0.0001%, 0.00075%, and 0.003% H2O2) and THA coating degradation was evaluated in vitro (25 U/mL hyaluronidase, 48 h) and in vivo (rat intraperitoneal implantation, 1–4 weeks). THA coatings degraded in vitro and in vivo with the lowest cross‐linking density (0.0001% H2O2), generally showing greater degradation as evidenced by significant decrease in coating cross‐sectional area. However, all three coatings remained partially degraded after 4 weeks of in vivo implantation. Alternate strategies to accelerate in vivo degradation of THA coatings are required to allow investigation of the study hypothesis. © 2019 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 107B:2664–2672, 2019.

Principles for the use of modern wound dressings for local treatment of limited borderline burns

“…Следовательно, необходимо применение раневых покрытий с совершенно иными свойствами -прежде всего обеспечивающими щелочную среду в ране и определенный микроклимат. Все больший интерес вызывает сульфатированный хитозан -главным образом из-за структурного сходства с гепарином [40,41], а также благодаря его совместимости с биологически активными веществами [42].…”

Abdominal wall hernia repair: from prosthetic meshes to smart materials

“…Hydrogels, with simple composition [ 22 , 23 ] or chemically modified or physically doped, can produce adhesive and tough hydrogels, which can be used for tissue regeneration including hernia. Due to the relatively weak mechanical strength, hydrogels are used as surface coatings to reduce tissue adhesion or increase the biocompatibility of hernia repair materials [ 24 , 25 ]. Electrospinning, on the other hand, has emerged as a leading strategy in tissue engineering to fabricate fibrous membranes with large surface-area-to-volume ratios and nano-to-micro-sized fibers [ 26 , 27 ].…”