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Cells Jun 2019There are many studies on certain skin cell specifications and their contribution to wound healing. In this review, we provide an overview of dermal cell heterogeneity... (Review)
Review
There are many studies on certain skin cell specifications and their contribution to wound healing. In this review, we provide an overview of dermal cell heterogeneity and their participation in skin repair, scar formation, and in the composition of skin substitutes. The papillary, reticular, and hair follicle associated fibroblasts differ not only topographically, but also functionally. Human skin has a number of particular characteristics that are different from murine skin. This should be taken into account in experimental procedures. Dermal cells react differently to skin wounding, remodel the extracellular matrix in their own manner, and convert to myofibroblasts to different extents. Recent studies indicate a special role of papillary fibroblasts in the favorable outcome of wound healing and epithelial-mesenchyme interactions. Neofolliculogenesis can substantially reduce scarring. The role of hair follicle mesenchyme cells in skin repair and possible therapeutic applications is discussed. Participation of dermal cell types in wound healing is described, with the addition of possible mechanisms underlying different outcomes in embryonic and adult tissues in the context of cell population characteristics and extracellular matrix composition and properties. Dermal white adipose tissue involvement in wound healing is also overviewed. Characteristics of myofibroblasts and their activity in scar formation is extensively discussed. Cellular mechanisms of scarring and possible ways for its prevention are highlighted. Data on keloid cells are provided with emphasis on their specific characteristics. We also discuss the contribution of tissue tension to the scar formation as well as the criteria and effectiveness of skin substitutes in skin reconstruction. Special attention is given to the properties of skin substitutes in terms of cell composition and the ability to prevent scarring.
Topics: Animals; Cicatrix; Dermis; Extracellular Matrix; Fibroblasts; Hair Follicle; Humans; Keloid; Myofibroblasts; Regeneration; Skin; Skin Physiological Phenomena; Skin, Artificial; Wound Healing
PubMed: 31216669
DOI: 10.3390/cells8060607 -
Wounds : a Compendium of Clinical... Dec 2019Burn wounds are one of the main causes of skin damage. Based on World Health Organization statistics, almost 300 000 people worldwide die of burns each year. In severe... (Review)
Review
Burn wounds are one of the main causes of skin damage. Based on World Health Organization statistics, almost 300 000 people worldwide die of burns each year. In severe burns, the cells and blood vessels are often injured and the blood supply to the wound is disturbed. Many factors such as oxygenation, infection, aging, hormones, and nutrition potentially can influence burn progression and disrupt repair with unbalanced release of various growth factors and cytokines. Different treatment approaches such as dressings and skin substitutes have been applied to aid wound healing. A thorough understanding of the effective factors on burns can improve wound healing outcomes. This review evaluates articles published on the Scopus, EMBASE, and PubMed databases that attempt to explain the pathophysiology, molecular components, and therapeutic approaches involved in the burn wound healing process.
Topics: Bandages; Burns; Disease Progression; Humans; Oxidative Stress; Skin Transplantation; Skin, Artificial; Wound Healing
PubMed: 31730513
DOI: No ID Found -
Cells Mar 2021With the global prevalence of type 2 diabetes mellitus steeply rising, instances of chronic, hard-healing, or non-healing diabetic wounds and ulcers are predicted to... (Review)
Review
With the global prevalence of type 2 diabetes mellitus steeply rising, instances of chronic, hard-healing, or non-healing diabetic wounds and ulcers are predicted to increase. The growing understanding of healing and regenerative mechanisms has elucidated critical regulators of this process, including key cellular and humoral components. Despite this, the management and successful treatment of diabetic wounds represents a significant therapeutic challenge. To this end, the development of novel therapies and biological dressings has gained increased interest. Here we review key differences between normal and chronic non-healing diabetic wounds, and elaborate on recent advances in wound healing treatments with a particular focus on biological dressings and their effect on key wound healing pathways.
Topics: Chronic Disease; Diabetes Mellitus, Type 2; Diabetic Foot; Humans; Skin, Artificial; Wound Healing; Wounds and Injuries
PubMed: 33804192
DOI: 10.3390/cells10030655 -
International Journal of Molecular... Apr 2017Tissue engineered skin substitutes for wound healing have evolved tremendously over the last couple of years. New advances have been made toward developing skin... (Review)
Review
Tissue engineered skin substitutes for wound healing have evolved tremendously over the last couple of years. New advances have been made toward developing skin substitutes made up of artificial and natural materials. Engineered skin substitutes are developed from acellular materials or can be synthesized from autologous, allograft, xenogenic, or synthetic sources. Each of these engineered skin substitutes has their advantages and disadvantages. However, to this date, a complete functional skin substitute is not available, and research is continuing to develop a competent full thickness skin substitute product that can vascularize rapidly. There is also a need to redesign the currently available substitutes to make them user friendly, commercially affordable, and viable with longer shelf life. The present review focuses on providing an overview of advances in the field of tissue engineered skin substitute development, the availability of various types, and their application.
Topics: Biocompatible Materials; Humans; Regeneration; Skin Physiological Phenomena; Skin Transplantation; Skin, Artificial; Tissue Engineering; Wound Healing
PubMed: 28387714
DOI: 10.3390/ijms18040789 -
Critical Care (London, England) Jun 2015Burns are a prevalent and burdensome critical care problem. The priorities of specialized facilities focus on stabilizing the patient, preventing infection, and... (Review)
Review
Burns are a prevalent and burdensome critical care problem. The priorities of specialized facilities focus on stabilizing the patient, preventing infection, and optimizing functional recovery. Research on burns has generated sustained interest over the past few decades, and several important advancements have resulted in more effective patient stabilization and decreased mortality, especially among young patients and those with burns of intermediate extent. However, for the intensivist, challenges often exist that complicate patient support and stabilization. Furthermore, burn wounds are complex and can present unique difficulties that require late intervention or life-long rehabilitation. In addition to improvements in patient stabilization and care, research in burn wound care has yielded advancements that will continue to improve functional recovery. This article reviews recent advancements in the care of burn patients with a focus on the pathophysiology and treatment of burn wounds.
Topics: Bandages; Biomarkers; Burns; Diagnostic Imaging; Edema; Fluid Therapy; Humans; Inflammation; Keratinocytes; Nutritional Support; Obesity; Resuscitation; Skin Transplantation; Skin, Artificial; Stem Cell Transplantation; Wound Healing; Wound Infection
PubMed: 26067660
DOI: 10.1186/s13054-015-0961-2 -
Nature Materials Apr 2024Microactuators provide controllable driving forces for precise positioning, manipulation and operation at the microscale. Development of microactuators using active...
Microactuators provide controllable driving forces for precise positioning, manipulation and operation at the microscale. Development of microactuators using active materials is often hampered by their fabrication complexity and limited motion at small scales. Here we report light-fuelled artificial goosebumps to actuate passive microstructures, inspired by the natural reaction of hair bristling (piloerection) on biological skin. We use light-responsive liquid crystal elastomers as the responsive artificial skin to move three-dimensionally printed passive polymer microstructures. When exposed to a programmable femtosecond laser, the liquid crystal elastomer skin generates localized artificial goosebumps, resulting in precise actuation of the surrounding microstructures. Such microactuation can tilt micro-mirrors for the controlled manipulation of light reflection and disassemble capillary-force-induced self-assembled microstructures globally and locally. We demonstrate the potential application of the proposed microactuation system for information storage. This methodology provides precise, localized and controllable manipulation of microstructures, opening new possibilities for the development of programmable micromachines.
PubMed: 38336868
DOI: 10.1038/s41563-024-01810-6 -
Minerva Medica Jun 2021Wound healing, especially of chronic wounds, is still an unmet therapeutic area since assessment and management are extremely complicated. Although many efforts have... (Review)
Review
Wound healing, especially of chronic wounds, is still an unmet therapeutic area since assessment and management are extremely complicated. Although many efforts have been made to treat wounds, all strategies have achieved limited results for chronic wounds. Stem cell-based therapy is considered a promising approach for complex wounds such as those occurring in diabetics. Mesenchymal stem cell transplantation significantly improves wound closure, angiogenesis and wound healing. However, cell therapy is complex, expensive and time-consuming. Recent studies have shown that stem cell-derived exosomes can be an exciting approach to treat wounds. Exosomes derived from mesenchymal stem cells can induce benefit in almost all stages of wound healing, including control of immune responses, inhibition of inflammation, promoting cell proliferation and angiogenesis, while reducing scar formation during the wound healing process. This review aimed at offering an updated overview of the use of exosomes in biological applications, such as wound healing, and addresses not only current applications but also new directions for this next-generation approach in wound healing.
Topics: Animals; Bandages; Cell Proliferation; Chronic Disease; Cytokines; Exosomes; Extracellular Matrix; Hemostasis; Humans; Inflammation; Intercellular Signaling Peptides and Proteins; Mesenchymal Stem Cells; Models, Animal; Neovascularization, Physiologic; Skin, Artificial; Wound Healing; Wounds and Injuries
PubMed: 33263376
DOI: 10.23736/S0026-4806.20.07205-5 -
Cyborg and Bionic Systems (Washington,... 2021In the past few years, we have gained a better understanding of the information processing mechanism in the human brain, which has led to advances in artificial... (Review)
Review
In the past few years, we have gained a better understanding of the information processing mechanism in the human brain, which has led to advances in artificial intelligence and humanoid robots. However, among the various sensory systems, studying the somatosensory system presents the greatest challenge. Here, we provide a comprehensive review of the human somatosensory system and its corresponding applications in artificial systems. Due to the uniqueness of the human hand in integrating receptor and actuator functions, we focused on the role of the somatosensory system in object recognition and action guidance. First, the low-threshold mechanoreceptors in the human skin and somatotopic organization principles along the ascending pathway, which are fundamental to artificial skin, were summarized. Second, we discuss high-level brain areas, which interacted with each other in the haptic object recognition. Based on this close-loop route, we used prosthetic upper limbs as an example to highlight the importance of somatosensory information. Finally, we present prospective research directions for human haptic perception, which could guide the development of artificial somatosensory systems.
PubMed: 36285142
DOI: 10.34133/2021/9843259 -
Advanced Healthcare Materials Mar 2018Patients with extensive burns rely on the use of tissue engineered skin due to a lack of sufficient donor tissue, but it is a challenge to identify reliable and... (Review)
Review
Patients with extensive burns rely on the use of tissue engineered skin due to a lack of sufficient donor tissue, but it is a challenge to identify reliable and economical scaffold materials and donor cell sources for the generation of a functional skin substitute. The current review attempts to evaluate the performance of the wide range of biomaterials available for generating skin substitutes, including both natural biopolymers and synthetic polymers, in terms of tissue response and potential for use in the operating room. Natural biopolymers display an improved cell response, while synthetic polymers provide better control over chemical composition and mechanical properties. It is suggested that not one material meets all the requirements for a skin substitute. Rather, a composite scaffold fabricated from both natural and synthetic biomaterials may allow for the generation of skin substitutes that meet all clinical requirements including a tailored wound size and type, the degree of burn, the patient age, and the available preparation technique. This review aims to be a valuable directory for researchers in the field to find the optimal material or combination of materials based on their specific application.
Topics: Animals; Biocompatible Materials; Burns; Humans; Skin, Artificial; Tissue Engineering
PubMed: 29271580
DOI: 10.1002/adhm.201700897 -
Bioengineering (Basel, Switzerland) Feb 2023Neuromodulation, specifically spinal cord stimulation (SCS), has become a staple of chronic pain management for various conditions including failed back syndrome,... (Review)
Review
Neuromodulation, specifically spinal cord stimulation (SCS), has become a staple of chronic pain management for various conditions including failed back syndrome, chronic regional pain syndrome, refractory radiculopathy, and chronic post operative pain. Since its conceptualization, it has undergone several advances to increase safety and convenience for patients and implanting physicians. Current research and efforts are aimed towards novel programming modalities and modifications of existing hardware. Here we review the recent advances and future directions in spinal cord stimulation including a brief review of the history of SCS, SCS waveforms, new materials for SCS electrodes (including artificial skins, new materials, and injectable electrodes), closed loop systems, and neurorestorative devices.
PubMed: 36829678
DOI: 10.3390/bioengineering10020185