Chitosan based hydrogels and their applications for drug delivery in wound dressings: A review

https://escholarship.org/content/qt5188s9nk/qt5188s9nk.pdf

Cell-based tissue engineering strategies used in the clinical repair of articular cartilage.

Conductive biomaterials based on conductive polymers, carbon nanomaterials, or conductive inorganic nanomaterials demonstrate great potential in wound healing and skin tissue engineering, owing to the similar conductivity to human skin, good antioxidant and antibacterial activities, electrically controlled drug delivery, and photothermal effect. However, a review highlights the design and application of conductive biomaterials for wound healing and skin tissue engineering is lacking. In this review, the design and fabrication methods of conductive biomaterials with various structural forms including film, nanofiber, membrane, hydrogel, sponge, foam, and acellular dermal matrix for applications in wound healing and skin tissue engineering and the corresponding mechanism in promoting the healing process were summarized. The approaches that conductive biomaterials realize their great value in healing wounds via three main strategies (electrotherapy, wound dressing, and wound assessment) were reviewed. The application of conductive biomaterials as wound dressing when facing different wounds including acute wound and chronic wound (infected wound and diabetic wound) and for wound monitoring is discussed in detail. The challenges and perspectives in designing and developing multifunctional conductive biomaterials are proposed as well.
Highlights:
1 The design and application of conductive biomaterials for wound healing are comprehensively reviewed, including versatile conductive agents, the various forms of conductive wound dressings, and different in vivo applications.2 Three main strategies of which conductive biomaterials realizing their applications in wound healing and skin tissue engineering are discussed.3 The challenges and perspectives in designing multifunctional conductive biomaterials and further clinical translation are proposed.

Conductive Biomaterials as Bioactive Wound Dressing for Wound Healing and Skin Tissue Engineering.

Background. We developed an experimental model of ethanol-induced dermatotoxicity and hepatocytoxicity using normal human keratinocytes and normal human hepatocytes that preserve inducible cytochrome p450 activities. The original work was described in several articles. The objective of this study was to determine whether hyaluronic acid attenuates skin necrosis, and to further clarify its uses in wound repair in humans, animal models and in vitro studies. Methods. We performed a systematic review of the literature using the terms “hyaluronic acid” and “wound healing”. PubMed was searched for studies published during the period 2010-2014. Results. Hyaluronic acid is used in tissue regeneration alone or in combination with herbal or Western medicine. Scaffolds made up of hyaluronic acid were used to embed basic fibroblast growth factor. Conclusion. Hyaluronic acid extracts are safe and efficacious products to be used in skin repair. This article is open to POST-PUBLICATION REVIEW . Registered readers (see “For Readers”) may comment by clicking on ABSTRACT on the issue’s contents page.

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Hyaluronic acid and wound healing.

Emerging roles of hyaluronic acid bioscaffolds in tissue engineering and regenerative medicine.

Enhancement of skin wound healing with decellularized scaffolds loaded with hyaluronic acid and epidermal growth factor

There is no effective therapy for the treatment of deep and large area skin wounds. Decellularized scaffolds can be prepared from animal tissues and represent a promising biomaterial for investigation in tissue regeneration studies. In this study, MTT assay showed that epidermal growth factor (EGF) increased NIH3T3 cell proliferation in a bell-shaped dose response, and the maximum cell proliferation was achieved at a concentration of 25 ng/ml. Decellularized scaffolds were prepared from pig peritoneum by a series of physical and chemical treatments. Hyaluronic acid (HA) increased EGF adsorption to the scaffolds. Decellularized scaffolds containing HA sustained the release of EGF compared to no HA. Rabbits contain relatively large skin surface and are less expensive and easy to be taken care, so that a rabbit wound healing model was use in this study. Four full-thickness skin wounds were created in each rabbit for evaluation of the effects of the scaffolds on the skin regeneration. Wounds covered with scaffolds containing either 1 or 3 μg/ml EGF were significantly smaller than with vaseline oil gauzes or with scaffolds alone, and the wounds covered with scaffolds containing 1 μg/ml EGF recovered best among all four wounds. Hematoxylin-Eosin staining confirmed these results by demonstrating that significantly thicker dermis layers were also observed in the wounds covered by the decellularized scaffolds containing HA and either 1 or 3 μg/ml EGF than with vaseline oil gauzes or with scaffolds alone. In addition, the scaffolds containing HA and 1 μg/ml EGF gave thicker dermis layers than HA and 3 μg/ml EGF and showed the regeneration of skin appendages on day 28 post-transplantation. These results demonstrated that decellularized scaffolds containing HA and EGF could provide a promising way for the treatment of human skin injuries.

Decellularized scaffolds containing hyaluronic acid and EGF for promoting the recovery of skin wounds

PHBVHHx scaffolds loaded with umbilical cord-derived mesenchymal stem cells or hepatocyte-like cells differentiated from these cells for liver tissue engineering

Skin damage is one of the common clinical skin diseases, and the main cure is the use of skin graft, especially for large area of skin injury or deep-skin damage. However, skin graft demand is far greater than that currently available. In this study, xenogeneic decellularized scaffold was prepared with pig peritoneum by a series of biochemical treatments to retain normal three-dimensional tissue scaffold and remove cells and antigenic components from the tissue. Scaffold was combined with hyaluronic acid (HA) plus two different concentrations of basic fibroblast growth factor (bFGF) and tested for its use for the repair of skin wounds. HA enhanced bFGF to adsorb to the decellularized scaffolds and slowed the release of bFGF from the scaffolds in vitro. A total of 20 rabbits were sacrificed on day 3, 6, 11, or 14 postsurgery. The wound healing rate and the thickness of dermis layer of each wound were determined for analyzing the wound repair. Statistical analysis was performed by the two-tailed Student's t...

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Xing Wei

Papers

Enhancement of skin wound healing with decellularized scaffolds loaded with hyaluronic acid and epidermal growth factor

Decellularized scaffolds containing hyaluronic acid and EGF for promoting the recovery of skin wounds

PHBVHHx scaffolds loaded with umbilical cord-derived mesenchymal stem cells or hepatocyte-like cells differentiated from these cells for liver tissue engineering

Use of decellularized scaffolds combined with hyaluronic acid and basic fibroblast growth factor for skin tissue engineering.

Use of decellularized scaffolds combined with hyaluronic acid and bFGF for skin tissue engineering.