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    Regulation of inflammatory microenvironment using a self-healing hydrogel loaded with BM-MSCs for advanced wound healing in rat diabetic foot ulcers. Bai Haotian,Kyu-Cheol Noh,Wang Zhonghan,Cui Yutao,Liu He,Liu Hou,Feng Yubin,Zhao Yue,Lin Quan,Li Zuhao Journal of tissue engineering A diabetic foot ulcer (DFUs) is a state of prolonged chronic inflammation, which can result in amputation. Different from normal skin wounds, various commercially available dressings have not sufficiently improved the healing of DFUs. In this study, a novel self-healing hydrogel was prepared by crosslinking of -carboxyethyl chitosan (-chitosan) and adipic acid dihydrazide (ADH) with hyaluronic acid-aldehyde (HA-ALD), to provide a moist and inflammatory relief environment to promote stem cell proliferation or secretion of growth factors, thus accelerating wound healing. The results demonstrated that this injectable and self-healing hydrogel has excellent swelling properties, stability, and mechanical properties. This biocompatible hydrogel stimulated secretion of growth factors from bone marrow mesenchymal stem cells (BM-MSCs) and regulated the inflammatory environment by inhibiting the expression of M1 macrophages and promoting the expression of M2 macrophages, resulting in granulation tissue formation, collagen deposition, nucleated cell proliferation, neovascularization, and enhanced diabetic wound healing. This study showed that -chitosan/HA-ALD hydrogel could be used as a multifunctional injectable wound dressing to regulate chronic inflammation and provide an optimal environment for BM-MSCs to promote diabetic wound healing. 10.1177/2041731420947242
    Polydimethylsiloxane incorporated with reduced graphene oxide (rGO) sheets for wound dressing application: Preparation and characterization. Qian Wei,Hu Xiaodong,He Weifeng,Zhan Rixing,Liu Menglong,Zhou Daijun,Huang Yong,Hu Xiaohong,Wang Zhanhua,Fei Guoxia,Wu Jun,Xing Malcolm,Xia Hesheng,Luo Gaoxing Colloids and surfaces. B, Biointerfaces Toward fabricating a novel multifunctional wound dressing material, we incorporated a series of contents of reduced graphene oxide (rGO) sheets into polydimethylsiloxane (PDMS) matrix to prepare the rGO-PDMS composite membrane and be used for wound dressing. The pore structure, dispersion of rGO, physical properties, water vapor transmission rate (WVTR), cytotoxicity and antibacterial activity were studied. Finally, the effect of the rGO-PDMS composite membrane on wound healing was investigated on a murine full-thickness skin wound model. The rGO-PDMS composite membrane exhibited bionic performance (ordered pore structure and suitable WVTR), improved mechanical properties, good compatibility and effective antibacterial activity. In vivo experiment indicated that the rGO-PDMS composite membrane could accelerate wound healing via enhancement of the re-epithelialization and granulation tissue formation. These findings suggest that rGO doping PDMS uniquely resulted in a multifunctional material for potential use in wound dressing. 10.1016/j.colsurfb.2018.03.008
    Polyurethane-modified graphene oxide composite bilayer wound dressing with long-lasting antibacterial effect. Jian Zhiwen,Wang He,Liu Menglong,Chen Siyao,Wang Zhanhua,Qian Wei,Luo Gaoxing,Xia Hesheng Materials science & engineering. C, Materials for biological applications In order to obtain a novel multifunctional wound dressing with good water vapor permeability and long-lasting antibacterial properties, a skin-like thermoplastic polyurethane (TPU) bilayer membrane containing self-made polyhexamethylene guanidine hydrochloride (PHMG) grafted graphene oxide (MGO) was prepared by non-solvent phase separation and particle filtration. The antibacterial properties and wound-healing ability of TPU, GO-TPU, MGO-TPU composite porous membrane are systematically compared. The results show that with the incorporation of MGO, the porous MGO-TPU membrane exhibits good biocompatibility, excellent water vapor transmission properties, and long-lasting broad-spectrum antibacterial properties (the antibacterial property remains unchanged for 30 days under continuously shaking and washing). The wound healing results for mouse model show that MGO-TPU could significantly accelerate the healing rate of wounds as it provides a sterile environment and also promotes the formation of re-epithelialization during wound healing. 10.1016/j.msec.2020.110833
    Novel Poly(vinyl alcohol)/Chitosan/Modified Graphene Oxide Biocomposite for Wound Dressing Application. Chen Siyao,Wang He,Jian Zhiwen,Fei Guoxia,Qian Wei,Luo Gaoxing,Wang Zhanhua,Xia Hesheng Macromolecular bioscience Rapid absorption of wound exudate and prevention of wound infection are prerequisites for wound dressing to accelerate wound healing. In this study, a novel kind of promising wound dressing is developed by incorporating polyhexamethylene guanidine (PHMG)-modified graphene oxide (mGO) into the poly(vinyl alcohol)/chitosan (PVA/CS) matrix, conferring the dressing the required mechanical properties, higher water vapor transmission rate (WVTR), less swelling time, improved antibacterial activity, and more cell proliferation compared to the PVA/CS film crosslinked by genipin. In vivo experiments indicate that the PVA/CS/mGO composite film can accelerate wound healing via enhancement of the re-epithelialization. PVA/CS/mGO composite film with 0.5 wt% mGO sheets displays the best wound healing properties, as manifested by the 50% higher antibacterial rate compared to GO and the wound healing rate of the mouse using this dressing is about 41% faster than the control group and 31% faster than the pure PVA/CS dressing. The underlying mechanism of the accelerated wound healing properties may be a result of the improved antibacterial ability to eradicate pathogenic bacteria on the wound area and maintain an appropriate moist aseptic wound healing environment to accelerate re-epithelialization. These findings suggest that this novel composite PVA/CS/mGO film may have promising applications in wound dressing. 10.1002/mabi.201900385