scholarly journals Tissue Fluidity Promotes Epithelial Wound Healing

2018 ◽  
Author(s):  
Robert J. Tetley ◽  
Michael F. Staddon ◽  
Shiladitya Banerjee ◽  
Yanlan Mao
Keyword(s):  
Wound Healing ◽  
Wound Closure ◽  
Tissue Mechanics ◽  
Animal Tissues ◽  
Wound Edge ◽  
Surrounding Environment ◽  
Epithelial Wound Healing ◽  
Repair Mechanisms ◽  
Tissue Tension

SummaryEpithelial tissues are inevitably damaged from time to time and must therefore have robust repair mechanisms. The behaviour of tissues depends on their mechanical properties and those of the surrounding environment1. However, it remains poorly understood how tissue mechanics regulates wound healing, particularly in in vivo animal tissues. Here we show that by tuning epithelial cell junctional tension, we can alter the rate of wound healing. We observe cells moving past each other at the wound edge by intercalating, like molecules in a fluid, resulting in seamless wound closure. Using a computational model, we counterintuitively predict that an increase in tissue fluidity, via a reduction in junctional tension, can accelerate the rate of wound healing. This is contrary to previous evidence that actomyosin tensile structures are important for wound closure2–6. When we experimentally reduce tissue tension, cells intercalate faster and wounds close in less time. The role we describe for tissue fluidity in wound healing, in addition to its known roles in developing7,8 and mature tissues9, reinforces the importance of the fluid state of a tissue.

scholarly journals Overexpression of the Oral Mucosa-Specific microRNA-31 Promotes Skin Wound Closure

2019 ◽  
Vol 20 (15) ◽  
pp. 3679 ◽  
Author(s):  
Lin Chen ◽  
Alyne Simões ◽  
Zujian Chen ◽  
Yan Zhao ◽  
Xinming Wu ◽  
...  
Keyword(s):  
Wound Healing ◽  
Oral Mucosa ◽  
Wound Closure ◽  
Expression Patterns ◽  
Skin Wound ◽  
Skin Wound Healing ◽  
Specific Expression ◽  
Keratinocyte Proliferation

Wounds within the oral mucosa are known to heal more rapidly than skin wounds. Recent studies suggest that differences in the microRNAome profiles may underlie the exceptional healing that occurs in oral mucosa. Here, we test whether skin wound-healing can be accelerating by increasing the levels of oral mucosa-specific microRNAs. A panel of 57 differentially expressed high expresser microRNAs were identified based on our previously published miR-seq dataset of paired skin and oral mucosal wound-healing [Sci. Rep. (2019) 9:7160]. These microRNAs were further grouped into 5 clusters based on their expression patterns, and their differential expression was confirmed by TaqMan-based quantification of LCM-captured epithelial cells from the wound edges. Of these 5 clusters, Cluster IV (consisting of 8 microRNAs, including miR-31) is most intriguing due to its tissue-specific expression pattern and temporal changes during wound-healing. The in vitro functional assays show that ectopic transfection of miR-31 consistently enhanced keratinocyte proliferation and migration. In vivo, miR-31 mimic treatment led to a statistically significant acceleration of wound closure. Our results demonstrate that wound-healing can be enhanced in skin through the overexpression of microRNAs that are highly expressed in the privileged healing response of the oral mucosa.

scholarly journals Continuous Delivery of Stromal Cell-Derived Factor-1 from Alginate Scaffolds Accelerates Wound Healing

2010 ◽  
Vol 19 (4) ◽  
pp. 399-408 ◽  
Author(s):  
Sina Y. Rabbany ◽  
Joseph Pastore ◽  
Masaya Yamamoto ◽  
Tim Miller ◽  
Shahin Rafii ◽  
...  
Keyword(s):  
Wound Healing ◽  
Stromal Cell ◽  
Wound Closure ◽  
Tissue Injury ◽  
Unmet Need ◽  
Novel Therapy ◽  
Yorkshire Pigs ◽  
Stromal Cell Derived Factor

Proper wound diagnosis and management is an increasingly important clinical challenge and is a large and growing unmet need. Pressure ulcers, hard-to-heal wounds, and problematic surgical incisions are emerging at increasing frequencies. At present, the wound-healing industry is experiencing a paradigm shift towards innovative treatments that exploit nanotechnology, biomaterials, and biologics. Our study utilized an alginate hydrogel patch to deliver stromal cell-derived factor-1 (SDF-1), a naturally occurring chemokine that is rapidly overexpressed in response to tissue injury, to assess the potential effects SDF-1 therapy on wound closure rates and scar formation. Alginate patches were loaded with either purified recombinant human SDF-1 protein or plasmid expressing SDF-1 and the kinetics of SDF-1 release were measured both in vitro and in vivo in mice. Our studies demonstrate that although SDF-1 plasmid- and protein-loaded patches were able to release therapeutic product over hours to days, SDF-1 protein was released faster (in vivo Kd 0.55 days) than SDF-1 plasmid (in vivo Kd 3.67 days). We hypothesized that chronic SDF-1 delivery would be more effective in accelerating the rate of dermal wound closure in Yorkshire pigs with acute surgical wounds, a model that closely mimics human wound healing. Wounds treated with SDF-1 protein ( n = 10) and plasmid ( n = 6) loaded patches healed faster than sham ( n = 4) or control ( n = 4). At day 9, SDF-1-treated wounds significantly accelerated wound closure (55.0 ± 14.3% healed) compared to nontreated controls (8.2 ± 6.0%, p < 0.05). Furthermore, 38% of SDF-1-treated wounds were fully healed at day 9 (vs. none in controls) with very little evidence of scarring. These data suggest that patch-mediated SDF-1 delivery may ultimately provide a novel therapy for accelerating healing and reducing scarring in clinical wounds.

scholarly journals Chitosan from Lucilia cuprina (Diptera: Calliphoridae) enhances sensitization to insulin treatment in a diabetic burn mice of wound healing

2020 ◽  
Vol 1 (1) ◽  
pp. 1-15
Author(s):  
Lamia M. El-Samad ◽  
◽  
Azza A. Attia ◽  
Basant A. Bakr ◽  
◽  
...  
Keyword(s):  
Wound Healing ◽  
Wound Closure ◽  
Lucilia Cuprina ◽  
Diabetic Mice ◽  
Burn Wound ◽  
Time Intervals ◽  
Burn Wound Healing ◽  
High Degree

Chitosan is recognized as a multipurpose biomaterial because of its low allergenicity, non-toxicity, biodegradability and biocompatibility. The present study was designed to estimate the role of chitosan derived from Lucilia cuprina on burn healing in diabetic mice; using histopathological and microbiological studies at different time intervals. Chitosan was prepared from L. cuprina with high molecular weight (MW) and high degree of deacetylation (DD) to evaluate its burn wound healing potential; skin burn closure assessment, histological and microbiological studies in vivo in male diabetic mice. Chitosan topical treatment was superior in wound closure acceleration; mainly in insulin injected group at all the time intervals. Additionally, earlier epidermal remodelling with mature and intense collagen deposition was encountered in all chitosan treated animals as well as non-diabetic burned animals. There was a significant delay in hair growth and poor epidermal remodelling with impairment of wound closure in diabetic groups. Moreover, chitosan treated groups assert the chitosan antibacterial effects with protecting the burn against contamination that hinders healing especially in this diabetic condition. Further researches needed to interpret effects of possible synergistic combination therapy.

scholarly journals Human interleukin-4–treated regulatory macrophages promote epithelial wound healing and reduce colitis in a mouse model

2020 ◽  
Vol 6 (23) ◽  
pp. eaba4376 ◽  
Author(s):  
Timothy S. Jayme ◽  
Gabriella Leung ◽  
Arthur Wang ◽  
Matthew L. Workentine ◽  
Sruthi Rajeev ◽  
...  
Keyword(s):  
Wound Healing ◽  
Healthy Volunteers ◽  
Wound Repair ◽  
Interleukin 4 ◽  
Cellular Immunotherapy ◽  
Blood Monocytes ◽  
Systemic Delivery ◽  
Epithelial Wound Healing

Murine alternatively activated macrophages can exert anti-inflammatory effects. We sought to determine if IL-4–treated human macrophages [i.e., hM(IL4)] would promote epithelial wound repair and can serve as a cell transfer treatment for inflammatory bowel disease (IBD). Blood monocytes from healthy volunteers and patients with active and inactive IBD were converted to hM(IL4)s. IL-4 treatment of blood-derived macrophages from healthy volunteers and patients with inactive IBD resulted in a characteristic CD206+CCL18+CD14low/− phenotype (RNA-seq revealed IL-4 affected expression of 996 genes). Conditioned media from freshly generated or cryopreserved hM(IL4)s promoted epithelial wound healing in part by TGF, and reduced cytokine-driven loss of epithelial barrier function in vitro. Systemic delivery of hM(IL4) to dinitrobenzene sulphonic acid (DNBS)–treated Rag1−/− mice significantly reduced disease. These findings from in vitro and in vivo analyses provide proof-of-concept support for the development of autologous M(IL4) transfer as a cellular immunotherapy for IBD.

scholarly journals Gypenoside LXXV Promotes Cutaneous Wound Healing In Vivo by Enhancing Connective Tissue Growth Factor Levels Via the Glucocorticoid Receptor Pathway

Molecules ◽  
2019 ◽  
Vol 24 (8) ◽  
pp. 1595 ◽  
Author(s):  
Sungjoo Park ◽  
Eunsu Ko ◽  
Jun Hyoung Lee ◽  
Yoseb Song ◽  
Chang-Hao Cui ◽  
...  
Keyword(s):  
Wound Healing ◽  
Growth Factor ◽  
Connective Tissue ◽  
Wound Closure ◽  
Tissue Growth ◽  
Cutaneous Wound Healing ◽  
Cutaneous Wound ◽  
And Migration ◽  
Proliferation And Migration

Cutaneous wound healing is a well-orchestrated event in which many types of cells and growth factors are involved in restoring the barrier function of skin. In order to identify whether ginsenosides, the main active components of Panax ginseng, promote wound healing, the proliferation and migration activities of 15 different ginsenosides were tested by MTT assay and scratched wound closure assay. Among ginsenosides, gypenoside LXXV (G75) showed the most potent wound healing effects. Thus, this study aimed to investigate the effects of G75 on wound healing in vivo and characterize associated molecular changes. G75 significantly increased proliferation and migration of keratinocytes and fibroblasts, and promoted wound closure in an excision wound mouse model compared with madecassoside (MA), which has been used to treat wounds. Additionally, RNA sequencing data revealed G75-mediated significant upregulation of connective tissue growth factor (CTGF), which is known to be produced via the glucocorticoid receptor (GR) pathway. Consistently, the increase in production of CTGF was confirmed by western blot and ELISA. In addition, GR-competitive binding assay and GR translocation assay results demonstrated that G75 can be bound to GR and translocated into the nucleus. These results demonstrated that G75 is a newly identified effective component in wound healing.

Silver Sulphadiazine- xanthan gum- hyaluronic Acid Composite Hydrogel for Wound Healing: Formulation Development and in vivo Evaluation

2020 ◽  
Vol 16 (1) ◽  
pp. 21-29 ◽  
Author(s):  
M.O. Ilomuanya ◽  
Z.A. Seriki ◽  
U.N. Ubani-Ukoma ◽  
B.A. Oseni ◽  
B.O. Silva
Keyword(s):  
Wound Healing ◽  
Hyaluronic Acid ◽  
Xanthan Gum ◽  
Wound Closure ◽  
Antimicrobial Agents ◽  
Biological Properties ◽  
Formulation Development ◽  
Hybrid Hydrogels ◽  
Silver Sulphadiazine

Background: Development and modifications of hybrid hydrogels have been done to improve biological properties or to decrease the disadvantages of biomaterials.Objectives: The efficacy of hyaluronic acid in combination with silver sulphadiazine in wound healing was investigated. The retaining properties of xanthan gum to aid re- epithelialization was also explored.Materials and Method: Four hybrid hydrogels comprising of different concentrations of xanthan gum, eugenol and antimicrobial agents – hyaluronic acid and silver sulphadiazine were formulated. The physicochemical properties of the gels were assessed, and the antimicrobial effectiveness of the different hydrogel were determined using the extent of wound closure as an index.Results: The hydrogel samples had approximately 90% moisture content with rate of evaporation between 26- 32% for a 5 h period at 37oC. The pH of all formulations was between 7.59 - 8.05 considering that the formulation would be applied to underlying tissues of the skin. The swelling index after a 12 h period in distilled water was 10% for HX 1, 27% for HX 2, 29% for HX 3 and 30% for HX 4. There was no new peak observed in the FTIR analysis to indicate formation of new bonds.Conclusion: Incorporation of silver sulphadiazine at 0.1% and hyaluronic acid at 1.5% in the formulation yielded the best results with regards to least presence of inflammatory cell infiltrates and excellent wound closure at 14 days compared to the control and other formulations. Further investigation may be required for clinical use as an effective wound dressing material. Keywords: Silver sulphadiazine, Xanthan gum, Hyaluronic acid, Hydrogels, Wound healing.

Fibronectin Enhancement of Corneal Epithelial Wound Healing of Rabbits In Vivo

1984 ◽  
Vol 102 (3) ◽  
pp. 455-456 ◽  
Author(s):  
T. Nishida ◽  
S. Nakagawa ◽  
C. Nishibayashi ◽  
H. Tanaka ◽  
R. Manabe
Keyword(s):  
Wound Healing ◽  
Corneal Epithelial ◽  
Epithelial Wound Healing

Effect of Ofloxacin on Corneal Epithelial Wound Healing Evaluated by In Vitro and In Vivo Methods

1993 ◽  
Vol 6 (2) ◽  
pp. 96-103 ◽  
Author(s):  
Steven S. Matsumoto ◽  
Michael E. Stern ◽  
Roger M. Oda ◽  
Corine R. Ghosn ◽  
Josephine W. Cheng ◽  
...  
Keyword(s):  
Wound Healing ◽  
Corneal Epithelial ◽  
Epithelial Wound Healing
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