A number of drawbacks in skin grafting for wound healing have drawn researchers to focus on skin tissue engineering as an alternative solution. The core idea of tissue engineering is to use scaffolds, cells, and/or bioactive molecules to help the skin to properly recover from injuries. Over the past decades, the field has significantly evolved, developing various strategies to accelerate and improve skin regeneration. However, there are still several limitations that should be addressed. Among these challenges, vascularization is known as a critical challenge that needs thorough consideration. Delayed wound healing of large defects results in an insufficient vascular network and ultimately ischemia. Recent advances in the field of tissue engineering paved the way to improve vascularization of skin substitutes. Generally, these solutions can be classified into two categories as (1) use of growth factors (GFs), reactive oxygen species (ROS)-inducing nanoparticles (NPs), and stem cells to promote angiogenesis, and (2) in vitro or in vivo prevascularization of skin grafts. This review summarizes the state-of-the-art approaches, their limitations, and highlights the latest advances on therapeutic vascularization strategies for skin tissue engineering.
To prevent postoperative complications, there has been a substantial interest in designing syringe-injectable hydrogels. To date, cryogels remain the only viable option for preformed and large-scale hydrogels to be delivered through a conventional needle–syringe injection. Cryogels, a type of hydrogel with exceptional features, are fabricated at subzero temperatures. This process typically results in a biomaterial with a unique macroporous network, shape-memory properties, and exceptional flexib...
Aim: To assess the potential of human induced pluripotent stem cell-derived smooth muscle cells (hiPSC-SMC) to accelerate diabetic wound healing. Methods: hiPSC-SMC were embedded in 3D collagen scaffolds and cultured in vitro for 72 h; scaffolds were then applied to diabetic, nude mouse, splinted back wounds to assess in vivo healing. Cultured medium after scaffold incubation was collected and analyzed for expression of pro-angiogenic cytokines. Results: hiPSC-SMC secrete increased concentration...
Last. Pankaj Karande(RPI: Rensselaer Polytechnic Institute)H-Index: 18
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Multilayered skin substitutes comprising allogeneic cells have been tested for the treatment of non-healing cutaneous ulcers. However, such non-native skin grafts fail to permanently engraft becaus...
Last. Du-yin Jiang(SDU: Shandong University)H-Index: 6
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Abstract It is the basic task of burn therapy to cover the wound with self-healthy skin timely and effectively. However, for patients with extensive burns, autologous skin is usually insufficient, and allogenic or heterogeneous skin leads to strong immune response. It is vital to choose an appropriate treatment for deep extensive burns. Nowadays, the dermal substitute combined with bone marrow mesenchymal stem cells (BM-MSCs) is a prospective strategy for burn wound healing. Denatured acellular ...
#1Liu Ouyang(HUST: Huazhong University of Science and Technology)H-Index: 3
#2Yang Dan(HUST: Huazhong University of Science and Technology)H-Index: 5
Last. Deyu Duan(HUST: Huazhong University of Science and Technology)H-Index: 5
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: Traumatic soft tissue defects such as bedsores, chronic skin ulcers, limb necrosis, osteonecrosis and other ischemic orthopedic diseases are the most clinically intractable and common problems in orthopedics due to unsatisfactory conventional treatments. The present study designed poly(ethylene glycol; PEG) hydrogels with covalently binded arginylglycylaspartic acid (RGD). Endothelial progenitor cells (EPCs) were encapsulated in the modified hydrogel along with vascular endothelial growth fact...
Abstract Introduction and aim Microangiopathy is a hallmark of systemic sclerosis (SSc). It is a progressive process from an early inflammatory and proangiogenic environment to insufficient microvascular repair with loss of microvessels. The exact underlying mechanisms remain ill-defined. Aim of the study was to investigate whether imbalanced angiopoietins/VEGF serum profile should be related in SSc to the altered microvascular reactivity characterized by aberrant angiogenesis and avascularity. ...
Abstract The aim of this study was to fabricate a hydrogel based therapy to accelerate full-thickness wound healing process. Hydrogel matrix was composed from of chitosan as backbone and maleic terminated polyethylene glycol (PEG-MA) as crosslinking agent. PEG-MA was synthesized through a reaction of PEG with maleic anhydride. For hydrogel preparation, various PEG-MA/chitosan ratios were assessed to find the optimum ratio. Further improvement on hydrogel properties was achieved by adding TiO2 na...
Last. Feng Zhao(MTU: Michigan Technological University)H-Index: 71
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Abstract Functional and perfusable vascular network formation is critical to ensure the long-term survival and functionality of engineered tissues after their transplantation. Although several vascularization strategies have been reviewed in past, the significance of microvessel organization in three-dimensional (3D) scaffolds has been largely ignored. Advances in high-resolution microscopy and image processing have revealed that the majority of tissues including cardiac, skeletal muscle, bone, ...
#1Dimple Chouhan(IITG: Indian Institute of Technology Guwahati)H-Index: 12
#2Namit Dey(IITG: Indian Institute of Technology Guwahati)H-Index: 1
Last. Biman B. Mandal(IITG: Indian Institute of Technology Guwahati)H-Index: 38
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Abstract Current advances in skin tissue engineering and wound healing augur well for the development of split or full thickness skin substitutes to recapitulating the native functional skin. These engineered skin substitutes have fared successfully in recent years with exploration of various emerging technologies. As a result, recent clinical practice has been highly evolved incorporating various engineered skin substitutes as an adjunct to accelerate healing and improvement of quality of life ...
The re-epithelialization with appendages is a major challenge to skin injury. Given that topographical factors initially modulate cell activities, the design of biomaterials with the topography (such as pattern and diameter) offers a promising strategy for achieving optimal skin wound healing. Herein, we prepare an aligned fish collagen reinforced poly (lactide-co-glycolide) electrospinning membrane (FC/PLGA) with different fiber diameters for promoting the re-epithelialization with appendages. ...
With the emergence of the coronavirus disease 2019 (COVID-19), the world is experiencing a profound human health crisis. The number of infections and deaths due to the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) continues to increase every minute, pinpointing major shortcomings in our ability to prevent viral outbreaks. Although several COVID-19 vaccines have been recently approved for emergency use, therapeutic options remain limited, and their long-term potency has yet to be v...
Electrospinning of natural and synthetic polymers has shown to be a great candidate for the fabrication of tissue engineering scaffolds due to their similarity to the nanofibrous structure of natural extracellular matrix (ECM). Moreover, the addition of ECM-like proteins could enhance the biocompatibility of these scaffolds. In this study, soluble eggshell protein (SEP) was first extracted and synthesized from the raw eggshell membrane. The characteristics and biocompatibility of the extracted S...
Last. Negar Azarpira(Shiraz University of Medical Sciences)H-Index: 27
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Along with providing an environment for cell attachment and proliferation, a tissue engineering scaffolds should possess physical and mechanical properties that would fit the target tissue. The present study aimed to manipulate physico-mechanical properties of polyacrylamide/gelatin hydrogels using response surface method-central composite design (RSM-CCD) to reach a scaffold with defined properties. On this demand, mixtures of gelatin and acrylamide (AAm) monomer were used to prepare semi-inter...
Abstract Wound infection is considered a significant challenge in skin injuries. Sprayable antibacterial wound dressings are interesting alternatives to their traditional counterparts because of their facile preparation, ease-of-use, and the possibility of topical delivery of antibacterial materials. Herein, novel sprayable antibacterial dressings are formulated and reported. The dressings were developed by in-situ formation of Ag-nanoparticles (Ag-NPs) using Persian gum (PG) as a carbohydrate p...
The re-epithelialization with appendages is a major challenge to skin injury. Given that topographical factors initially modulate cell activities, the design of biomaterials with the topography (such as pattern and diameter) offers a promising strategy for achieving optimal skin wound healing. Herein, we prepare an aligned fish collagen reinforced poly (lactide-co-glycolide) electrospinning membrane (FC/PLGA) with different fiber diameters for promoting the re-epithelialization with appendages. ...
The success of skin tissue engineering for deep wound healing relies predominantly on the design of innovative and effective biomaterials. This study reports on the synthesis and characterization of a new type of naturally-derived and macroporous interpenetrating polymer network (IPN) for skin repair. These biomaterials consist of a biologically active fibrous fibrin network polymerized within a mechanically robust and macroporous construct made of polyethylene glycol and biodegradable serum alb...