Nanofibers for improving the wound repair process: the combination of a grafted chitosan and an antioxidant agent

2017 ◽  
Vol 8 (10) ◽  
pp. 1664-1671 ◽  
Author(s):  
Lan Mei ◽  
Rangrang Fan ◽  
Xiaoling Li ◽  
Yuelong Wang ◽  
Bo Han ◽  
...  

Wound healing, a complex process involving several important biomolecules and pathways, requires efficient dressings to enhance the therapy effects.

Circulation ◽  
2014 ◽  
Vol 130 (suppl_2) ◽  
Author(s):  
Archita Das ◽  
Gin-Fu Chen ◽  
Ha Won Kim ◽  
Seock-Won Youn ◽  
Sudhahar Varadarajan ◽  
...  

Background: Wound healing is important repair process after injury associated with inflammation and angiogenesis. Copper (Cu) plays an important role in wound healing and angiogenesis; however, underlying mechanism is unknown. Bioavailability of Cu is tightly controlled by transport proteins (Cu importer CTR1 and Cu exporter ATP7A) and chaperone (antioxidant-1, Atox1) which transfers Cu to ATP7A. We reported that Atox1 also functions as a Cu-dependent transcription factor; however, its role in wound healing is unclear. Results: Using mouse skin puncture model, here we show that, Atox 1 protein (8 fold) and Cu level (by X-ray Fluorescence Microscope; 2.5 fold) increased in skin after wounding in WT mice at day 7 when Atox1 was localised in the nucleus of dermis endothelial cell (ECs) and ATP7A was markedly decreased. ATP7A transgenic mice showed impaired wound healing. Atox1 knockout (KO) mice exhibited decrease in wound repair (40% inhibition vs. WT, day 7) which was rescued by Atox1 gene transfer by lentivirus. Macrophage which secrets angiogenic cytokines/chemokines was significantly reduced which resulted in decreased VEGF and SDF-1α protein and angiogenesis at day 7. In cultured human ECs, inflammatory cytokine TNF-stimulation significantly decreased ATP7A protein (80%) and increased intracellular Cu and Atox1 in nucleus. ATP7A knockdown with siRNA in ECs increased intracellular Cu and promoted nuclear Atox1, which were rescued by Cu importer CTR1 siRNA or Cu chelator BCS, indicating ATP7A downregulation-induced Cu accumulation is required for Atox1 nuclear translocation. By screening Atox1 target genes, we found that NADPH oxidase p47phox promoter contains Atox1 binding responsible element. p47phox protein expression was significantly increased by wounding or overexpression of nuclear-targeted Atox1, which was markedly decreased in Atox1 KO mice with its downstream VCAM1/ICAM1. Conclusions: Cu chaperone Atox1 functions as a transcription factor by sensing ATP7A downregulation-induced intracellular Cu to upregulate NADPH oxidase p47phox and its downstream redox-sensitive VCAM1/ICAM1 expression in response to injury. This in turn promotes inflammatory cell recruitment and angiogenesis, and thus stimulating wound repair.


Author(s):  
Nurul Ibrahim ◽  
Sok Wong ◽  
Isa Mohamed ◽  
Norazlina Mohamed ◽  
Kok-Yong Chin ◽  
...  

Wound healing is a complex process of recovering the forms and functions of injured tissues. The process is tightly regulated by multiple growth factors and cytokines released at the wound site. Any alterations that disrupt the healing processes would worsen the tissue damage and prolong repair process. Various conditions may contribute to impaired wound healing, including infections, underlying diseases and medications. Numerous studies on the potential of natural products with anti-inflammatory, antioxidant, antibacterial and pro-collagen synthesis properties as wound healing agents have been performed. Their medicinal properties can be contributed by the content of bioactive phytochemical constituents such as alkaloids, essential oils, flavonoids, tannins, saponins, and phenolic compounds in the natural products. This review highlights the in vitro, in vivo and clinical studies on wound healing promotions by the selected natural products and the mechanisms involved.


Cells ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1729
Author(s):  
Raquel Guillamat-Prats

Tissue repair and regeneration after damage is not completely understood, and current therapies to support this process are limited. The wound healing process is associated with cell migration and proliferation, extracellular matrix remodeling, angiogenesis and re-epithelialization. In normal conditions, a wound will lead to healing, resulting in reparation of the tissue. Several risk factors, chronic inflammation, and some diseases lead to a deficient wound closure, producing a scar that can finish with a pathological fibrosis. Mesenchymal stem/stromal cells (MSCs) are widely used for their regenerative capacity and their possible therapeutically potential. Derived products of MSCs, such as exosomes or extravesicles, have shown a therapeutic potential similar to MSCs, and these cell-free products may be interesting in clinics. MSCs or their derivative products have shown paracrine beneficial effects, regulating inflammation, modifying the fibroblast activation and production of collagen and promoting neovascularization and re-epithelialization. This review describes the effects of MSCs and their derived products in each step of the wound repair process. As well, it reviews the pre-clinical and clinical use of MSCs to benefit in skin wound healing in diabetic associated wounds and in pathophysiological fibrosis.


2021 ◽  
Vol 6 (2) ◽  
pp. 171-176
Author(s):  
Saurabh Verma ◽  
Gaurav K. Keshri ◽  
Manish Sharma ◽  
Asheesh Gupta

Treatment of non-healing burn injuries is a major challenge for the current scientific research. Hydrogen sulfide (H2S) is an endogenous gasotransmitter, which regulates redox homeostasis and cytoprotection during pathophysiological conditions. Similarly, heat shock proteins (HSPs) are molecular chaperones, which also confer cytoprotection during the wound repair process. Notably, the role of H2S as a regulator of HSPs during burn wound healing is still elusive. The present study investigated the effects of H2S supplementation on molecular chaperones during full-thickness, third-degree burn wound healing in the experimental rats. The animals were treated with sodium hydrosulphide (NaHS) as H2S donor (5 mg/kg body weight, intraperitoneal) daily for 10 days prior to burn-induction and continued till the fifth-day post-wounding. Histopathological analysis (Masson’s trichrome) revealed enhanced wound healing evident by increased collagen fiber deposition, cellular proliferation and re-epithelialisation in NaHS administered group as compared to the burn control. Furthermore, immunoblot analyses demonstrated significantly increased protein expression of molecular chaperons viz. HSP90, HSP70, HSP27, and GRP78 in H2S treated group as compared to control. Therefore, the present study signifies that H2S supplementation upregulates the protein expression levels of molecular chaperones, which could facilitate the cytoprotection during the tissue repair process and accelerates the burn wound healing.


2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Samir Malhotra ◽  
Michael S. Hu ◽  
Clement D. Marshall ◽  
Tripp Leavitt ◽  
Alexander T. M. Cheung ◽  
...  

Chronic wounds are a source of substantial morbidity for patients and are a major financial burden for the healthcare system. There are no current therapies that reliably improve nonhealing wounds or reverse pathological scarring. Mesenchymal stromal cells (MSCs) are a promising source of novel cell-based therapies due to the ease of their harvest and their integral role in the native wound repair process. Recent work has addressed the problems of loss of plasticity and off-target delivery through use of modern bioengineering techniques. Here we describe the applications of MSCs harvested from different sources to the wound healing process and recent advances in delivery of MSCs to targeted sites of injury.


2019 ◽  
Vol 20 (23) ◽  
pp. 6097 ◽  
Author(s):  
Xiang Xue ◽  
Daniel M. Falcon

Intestinal wound healing is a complicated process that not only involves epithelial cells but also immune cells. In this brief review, we will focus on discussing the contribution and regulation of four major immune cell types (neutrophils, macrophages, regulatory T cells, and innate lymphoid cells) and four cytokines (interleukin-10, tumor necrosis factor alpha, interleukin-6, and interleukin-22) to the wound repair process in the gut. Better understanding of these immune factors will be important for developing novel targeted therapy.


The biological process of Wound healing comprises the trauma and pathologic condition of the oral mucosa.For this requires proper management so the wound heal faster and without any complication.The strong indicator of wound healing is the increase in number of fibroblast cells in the oral mucosa. The remodelling phase of wound healing shows decreasing fibroblast cell proliferation and then collagen fibres are synthesized. Noni plant have tremendous medicinal uses, by observing this fact Noni leaf (Morinda citrifolia L.), a part of the noni plant, was successfully used in present research to make ointments to heal soft tissue in wounds. The leaves of Morinda have potential chemical compounds such as glycosides, sterol, amino acids and scopletin that may be useful in the wound repair process. In addition to this Morinda citrifolia leaf contains active substances such as saponin, tannin, polyphenol flavonoid, and triterpen. The purpose of this research is to discover the activeness of the Morinda citrifolia leaves extracts in normal solvent such as ethanol to make ointments in order to arrest the growth of the bacteria.[1] By using macernation extract of morinda leaves done successfully, ointment made and done the evalution test such as spreadibilty, diffusion study,washability and very important antimicrobial test. The entire test gives corresponding good result, so the present research showing good response to healing mechanism of wounds.[3]


2003 ◽  
Vol 83 (3) ◽  
pp. 835-870 ◽  
Author(s):  
SABINE WERNER ◽  
RICHARD GROSE

Werner, Sabine, and Richard Grose. Regulation of Wound Healing by Growth Factors and Cytokines. Physiol Rev 83: 835–870, 2003; 10.1152/physrev.00032.2002.—Cutaneous wound healing is a complex process involving blood clotting, inflammation, new tissue formation, and finally tissue remodeling. It is well described at the histological level, but the genes that regulate skin repair have only partially been identified. Many experimental and clinical studies have demonstrated varied, but in most cases beneficial, effects of exogenous growth factors on the healing process. However, the roles played by endogenous growth factors have remained largely unclear. Initial approaches at addressing this question focused on the expression analysis of various growth factors, cytokines, and their receptors in different wound models, with first functional data being obtained by applying neutralizing antibodies to wounds. During the past few years, the availability of genetically modified mice has allowed elucidation of the function of various genes in the healing process, and these studies have shed light onto the role of growth factors, cytokines, and their downstream effectors in wound repair. This review summarizes the results of expression studies that have been performed in rodents, pigs, and humans to localize growth factors and their receptors in skin wounds. Most importantly, we also report on genetic studies addressing the functions of endogenous growth factors in the wound repair process.


Author(s):  
Rick L. Vaughn ◽  
Shailendra K. Saxena ◽  
John G. Sharp

We have developed an intestinal wound model that includes surgical construction of an ileo-cecal patch to study the complex process of intestinal wound healing. This allows approximation of ileal mucosa to the cecal serosa and facilitates regeneration of ileal mucosa onto the serosal surface of the cecum. The regeneration of ileal mucosa can then be evaluated at different times. The wound model also allows us to determine the rate of intestinal regeneration for a known size of intestinal wound and can be compared in different situations (e.g. with and without EGF and Peyer’s patches).At the light microscopic level it appeared that epithelial cells involved in regeneration of ileal mucosa originated from the enlarged crypts adjacent to the intestinal wound and migrated in an orderly fashion onto the serosal surface of the cecum. The migrating epithelial cells later formed crypts and villi by the process of invagination and evagination respectively. There were also signs of proliferation of smooth muscles underneath the migratory epithelial cells.


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