Burn Wound Healing In Rats Research Articles

The Comparison of Clinical and Histopathological Effects of Topical Psyllium (Plantago ovata) Powder and Silver Sulfadiazine on Second-Degree Burn Wound Healing in Rats.

BACKGROUNDBurn wounds are a worldwide health problem, leading to physical and psychological disabilities in all age’s groups. With regard to absorbent properties of Plantago ovata mucilage which can decrease wound moisture, we aimed to compare the effect of silver sulfadiazine (SSD) 1% and powdered P. ovata on second-degree burn wound healing in rats. METHODSThis experimental study was conducted on 30 male Wistar rats with second-degree burn in three groups. Group 1 (control) did not receive any treatment; group 2 and group 3 (treated groups) were dressed daily using SSD cream and P. ovata powder, respectively. The weight of rats, wound size (by applying ImageJ software) and percentage of wound healing on the 5th, 7th, 10th, 13th, 16th, 19th, and 22nd days (by diagnosing a plastic surgeon) and histological cutaneous changes at day 22 were evaluated. The Prism software was applied for data analysis. The Haematoxylin & Eosin as well as Masson's trichrome staining were performed on wound skin biopsies. RESULTSOn day 22nd, 20%, 50% and 60% of the rats had complete wound healing in the control, SSD and P. ovata groups, respectively. A significant decrease in wound size was shown in the treated groups compared to the control group (P<0.01), but no significant difference was shown between the treated groups (P>0.05).CONCLUSIONHowever, the wound healing in P. ovata group or SSD was better than the control group, and the significant difference was not found with the treated group.

Effect of topical Areca palm L. hydroalcoholic extract on burn wound healing in rats.

Objectives:Wound healing is a complex and dynamic process that begins immediately following tissue injury and continues until the wound is completely healed and remodeled. Applying the most effective burn repair techniques is a constant challenge in medicine. Antiulcerogenic and wound healing properties of Areca palm leaves have been validated through various investigations and animal studies. This study aimed to determine the potential for A. palm hydroalcoholic extract to heal burn wounds in rats.Materials and Methods:For 14 days, we examined 40 male Wistar albino rats in 5 groups: those receiving 1% silver sulfadiazine cream (reference standard), those receiving eucerin (positive control), and those receiving 5% and 10% ointments of Areca catechu hydroalcoholic extract (treatment groups). No treatment was given to the negative control group. On the dorsal part of the animals’ necks, burn wounds were made. After the rats were sacrificed, the wound contraction rate (WCR) was determined, and the wound sites were histopathologically examined.Results:On the 14th day, the WCR was significantly higher in rats treated with A. palm 10% extract ointment than in rats treated with 5% extract, positive or negative control groups (p < 0.001), or rats treated with silver sulphfadiazine (p = 0.01). After applying a 10% extract ointment to burn wound sites, complete healing occurred with only mild tissue inflammation and edema.Conclusion:The study’s findings indicate that the hydroalcoholic extract of A. palm L. has the ability to expedite the wound healing process. Additional research is necessary to identify the compounds responsible for their wound healing properties and comprehend their action mechanism.

The Effect of Educated Platelets on the Healing Process of Burn Wounds in Rats: Educated Platelets in Rat Burn Wound Healing

Burns are serious life-threatening health problems. This study was performed to determine the effect of educated platelets on burn wound healing process. 28 female wistar albino 200-220 gr rats were randomly divided into four groups. Group A1 rats(n:7) were the first-line burnt group from which blood samples are extracted to develop platelet-rich plasma(PRP) with the educated platelets that have a response to burn injury. Group B1 rats(n:7) were the unburnt group with ordinary platelets. Group A2 rats(n:8) were the second-line burnt group which was given PRP with educated platelets. Group B2 rats(n:6), as control group, were the second-line burnt group which was given PRP with ordinary platelets. Photos of rats' dorsum were taken by digital camera on the first day and 21st day of the study. Wound healing was determined by scar surface area. In the study group (Group A2) mean wound area was 53±37 mm², in the control group (Group B2) mean wound area was 114±55 mm² on the last day of the experiment. The sizes of the wounded areas were significantly lower in the study group compared with the control group (p: 0.039). Educated platelets seem to facilitate the recovery period of burn wound healing in rats.

Healing Effects of Human Amniotic Membrane and Burned Wool on the Second-degree Burn in Rats

ackground: This study aimed to compare sheep burnt wool and human amniotic membrane (AM) on second-degree burn wound healing in rats. Materials and Methods: Seventy-two adult male rats of Sprague Dawley underwent general anesthesia, and a deep second-degree burn was created on their skin by a hot iron plate. Afterward, human AM, silver sulfadiazine ointment (SSD), and sheep burned wool were used on wound area for burn treatment. On days 7, 14, and 21 of the experiment, the rats were sacrificed, and histopathological assessments were done. Results: Human AM, in comparison with other groups, significantly (P&lt;0.05) showed better improvement in all pathologic variables. Burned wool showed significant improvement compared to the control group on day 7 in the angiogenesis, on day 14 in granulation tissue formation and epithelial formation, and on day 21 in new epithelial formation (P&lt;0.05). Burned wool compared with SSD ointment in granulation tissue formation improved significantly (P&lt;0.05) on days 7 and 14. Also, SSD ointment in comparison with the control group significantly improved (P&lt;0.05) granulation tissue formation and macrophage on day 7. Conclusion: Human AM has a significant effect on the treatment of second-degree burn. Burned wool has a better effect on wound healing than SSD ointment and negative control group without treatment in terms of granulation tissue and epithelium formation. [GMJ.2020;9:e1759]

Healing Effects of Human Amniotic Membrane and Burned Wool on the Second-degree Burn in Rats.

Background: This study aimed to compare sheep burnt wool and human amniotic membrane (AM) on second-degree burn wound healing in rats. Materials and Methods: Seventy-two adult male rats of Sprague Dawley underwent general anesthesia, and a deep second-degree burn was created on their skin by a hot iron plate. Afterward, human AM, silver sulfadiazine ointment (SSD), and sheep burned wool were used on wound area for burn treatment. On days 7, 14, and 21 of the experiment, the rats were sacrificed, and histopathological assessments were done. Results: Human AM, in comparison with other groups, significantly (P<0.05) showed better improvement in all pathologic variables. Burned wool showed significant improvement compared to the control group on day 7 in the angiogenesis, on day 14 in granulation tissue formation and epithelial formation, and on day 21 in new epithelial formation (P<0.05). Burned wool compared with SSD ointment in granulation tissue formation improved significantly (P<0.05) on days 7 and 14. Also, SSD ointment in comparison with the control group significantly improved (P<0.05) granulation tissue formation and macrophage on day 7. Conclusion: Human AM has a significant effect on the treatment of second-degree burn. Burned wool has a better effect on wound healing than SSD ointment and negative control group without treatment in terms of granulation tissue and epithelium formation.

Dynamics of Burn Wound Healing in Rats Irradiated by Nanosecond Microwave Pulses

The problem of skin regeneration after burns, which is ranked high on the list of injuries by the World Health Organization...

Repair function of essential oil from Crocodylus Siamensis (Schneider, 1801) on the burn wound healing via up-regulated growth factor expression and anti-inflammatory effect

Ethnopharmacological relevanceCrocodile oil has been used by traditional physicians around the world to treat wound healing and inflammation. However, the scientific rationale and mechanism behind its use in vivo has not been fully researched. Aims of the studyWe mainly investigated the mechanism during crocodile oil treatment of up-regulated growth factor expression and anti-inflammatory on burn wound healing in rats. Materials and methodsThe moisture and nitric oxide (NO) levels in the skin of rats were analyzed in the first 14 days after burn and the changes of the structure of the skin tissues in the wound healing were studied by hematoxylin-eosin (H.E.) staining within 21 days after scald. The inflammatory factor on burn wound healing in rats was dected by ELISA kits and Q-PCR. the expression of a variety of growth factors (TGF-β1, VEGE-α, EGF) and PCNA in the skin tissue after burns was evaluated using immunohistochemistry. The down-regulated phosphorylation of p38 MAPK in the wound healing was confirmed by Western-blot analysis. In addition, TEM was used to observe the ultrastructure of scalded skin. ResultsThis study showed that crocodile oil could significantly reduce the protein and mRNA levels of TNF-α, IL-1β and IL-6. And it was found that the phosphorylation of p38 MAPK was down-regulated in the wound healing (p < 0.05). Meanwhile, crocodile oil can promote the expression of a variety of growth factors (TGF-β1, VEGE-α, EGF) and PCNA in the skin tissue after burns, and promote the repair of collagen fibers in the dermis, preventing the production of melanin and maintain the appearance of repaired skin.

A Dermal Gel Made of Rutilus Kutum Skin Collagen-Chitosan for Deep Burn Healing

Natural compounds extracted from marine organisms consisting of biological active materials like collagen provide a major source of compound with medical applications including wound dressing particularly in co-treatment with other natural or synthetic materials to quick the wound healing process. The current study investigates the potential of Rutilus kutum skin-extracted collagen in combination with chitosan [collagen-chitosan (Col-CH) gel] for in vivo second-degree burn wound healing in rats following finding of the most effective collagen-chitosan ratio. Collagen and chitosan were extracted from R. Kutum skin and shell waste of shrimp, respectively, using acid–base method. SDS-PAGE was performed to determine subunit composition of collagen. After amino acid analysis using HPLC, different ratios of collagen and chitosan mixture (Col-CH, 1:3, 1:1 and 3:1) were prepared to fine the most effective of Col-CH gel on burn wound healing and compare to animals treated with silver sulfadiazine ointment. Wound surface area was analyzed using ImageJ software on days 15 and 30. H&E staining was performed to show the epithelialization, collagen deposition, fibroblast cell accumulation and vessel formation on days 15 and 30. The results from H&E were scored and quantified by pathologist. SDS-PAGE technique revealed that extracted-collagen was type 1 composed of two α (α1 and α2) chains. HPLC showed that Glycine was the most abundant amino acid which included one-third of total amino acid in the skin. The wound surface measurement showed a significant reduction in wound size in animals treated with Col-CH (1:1) compared to silver sulfadiazine treated group at day 25. Histopathological findings represented high score in epithelialization, vessel formation and a decrease in inflammatory cells infiltration in Col-CH (1:1) treated group on days 15 and 30. These data suggest collagen in combination with chitosan with 1:1 ratio can significantly restore burn wound compared to silver sulfadiazine ointment.

Macroscopic and Microscopic Survey of the Comparative Effects of Lactobacillus plantarum 299v, Its Supernatant, and Imipenem on Infectious Burn Wound Healing in Rats

Macroscopic and Microscopic Survey of the Comparative Effects of Lactobacillus plantarum 299v, Its Supernatant, and Imipenem on Infectious Burn Wound Healing in Rats

Amnion and collagen-based blended hydrogel improves burn healing efficacy on a rat skin wound model in the presence of wound dressing biomembrane.

A burn wound is one of the most frequent and devastating injuries for patients which requires extensive care. Early treatment of burn wounds improves healing significantly. This study was designed to investigate the efficacy of amnion and collagen-based hydrogels on cutaneous burn wound healing in rats with covering membrane. We prepared a novel cell free hydrogel comprising human amnion, rabbit collagen, carboxymethyl cellulose sodium salt, citric acid, methyl paraben, propyl paraben, glycerin and triethanol amine. The wound covering membrane was developed from rabbit collagen and prawn shell chitosan. Beside swelling ratio, water absorption, equilibrium water content, gel fraction and spreadability analysis, in vitro cytotoxicity and biocompatibility tests were performed for the formulated hydrogels. Following the skin irritation study, second-degree burns were created on the dorsal region of the rats and the gels were applied with/without covering membrane to study the wound contraction and re-epithelialization period. The formulated hydrogels were observed non-cytotoxic and compatible with human blood cells. No erythema and edema were found in skin irritation assay confirming the safety and applicability. Hydrogel consisting in a combination of amnion and collagen demonstrated significantly rapid wound healing, driven by complete re-epithelialization (16.75 ± 0.96 days) and closure by wound contraction (72 ± 3.27%, P < 0.0000009) when wound dressing membrane was used, whereas this gel alone healed about 62.5 ± 4.43% (P < 0.00001) and required 18.75 ± 0.50 days to complete re-epithelialization. Additionally, the gel with covering membrane treated group had maximum average body weight, food and water intake. The amnion and collagen-based blended gel offers alternative possibilities to treat skin wounds when covered with film, which could overcome the limitations associated with modern therapeutic products such as high costs, long manufacturing times, complexities, storing, and presence of living biomaterials.

Bone Marrow-Derived Mesenchymal Stem Cells Combined With Simvastatin Accelerates Burn Wound Healing by Activation of the Akt/mTOR Pathway.

Burn wound healing is one of the most important problems in the field of medical science. Promising results have recently been reported by researchers who used bone marrow mesenchymal stem cells (BMSCs) to treat burn wounds. In this study, we investigated the effects of BMSC therapy in combination with simvastatin (SMV) on angiogenesis as well as on the activity of the Akt/mTOR signaling pathway during burn wound healing in rats. After creating second-degree burn wounds, 40 adult male Wistar rats were randomly divided into four treatment groups: the control, SMV, BMSCs, and the combination therapy group (BMSCs+SMV). Animals were killed 14 days after treatment initiation, and the wounds were removed for histological and molecular analyses. All in all, combination therapy produced better outcomes than individual therapy in terms of the wound closure area, epidermal regeneration level, collagen deposition intensity, and reepithelialization rate. In addition, the elevations of expression levels of Akt and mTOR genes, at both mRNA and protein levels, were more pronounced in the BMSCs+SMV group (P < .05, at least, for both qRT-PCR and western blot assessments). qRT-PCR findings also demonstrated that the wounds treated with the combination of BMSCs and SMV had the highest expression levels of CD31 and VEGF genes (P < .01 for all comparisons). These data suggest that the combined administration of BMSCs transplantation and topical SMV has a great potential in burn wound healing. According to the findings, the beneficial effects of the combination therapy are caused, at least in part, through stimulating Akt/mTOR signaling pathway.

The effects of melatonin on the healing of burn wounds in pinealectomized rats.

The present study aims to investigate the favorable effects of melatonin on burn wound healing in rats. In this study, forty Wistar-albino-type male rats were divided into four groups. Group 1 was the control group, Group 2 rats were treated using exogenous melatonin, Group 3 rats were pinealectomized, and Group 4 rats were pinealectomized then treated with exogenous melatonin. In all groups, a deep second-degree burn was created on the backs of the rats with a metal plate heated in boiling water. We monitored the progress of burn healing for seven days. At the end of them, we evaluated hydroxyproline levels, type III collagen, edema, inflammatory infiltration, congestion, vascular proliferation, fibrosis, the thickness of the zone of stasis and the epithelium to assess the progress of healing. The zone of stasis was less thick in Group 2 than the other groups (p=0.009). Type III collagen dyeing (p=0.031), fibrosis (p=0.011) and edema (p=0.031) were higher in Group 2 than the other groups. Congestion was higher in the control group than Group 4 (p=0.031). Other evaluated parameters showed no significant differences among the groups. In this study, it was noted that once total melatonin levels exceeded a certain threshold, a preventive effect was exerted on burn wound damage progression by reducing the zone of stasis. Melatonin may also prevent the development of hypertrophic scarring. Melatonin may be a potential therapeutic option that can supplement traditional treatment in burn wounds; however, further studies with higher doses of exogenous melatonin administered over longer periods are needed to further evaluate the effects noted in this study.

Intravenous Administration of Granulocyte-Colony Stimulating Factor for Stem Cells Mobilization and Third Degree Burn Wound Healing in Rats

Introduction: Burns are one the most common skin damages which require medical intervention to be fully-recovered. In this light, tissue engineering field presents a vide verity of strategies including both scaffold-based and cell-based approaches to recover the damaged site. Materials and Methods: In this study, the effects of granulocyte-colony stimulating factor (G-CSF) administration on mobilization of the bone marrow mesenchymal stem cells (MSCs) into defect area and treatment of the skin burn wound was examined in vivo. The G-CSF was injected intravenously into rats subjected to third degree burn wound. At days 3, 5, 7, 15 and 30 post-injections, the defect site was removed and investigated by H&E and Malory’s trichrome staining. The number of MSCs in blood samples was also determined by flow cytometry assay. Results: According to the results, intravenously administration of G-CSF significantly increased collagenesis and number of fibroblast cells infiltrated into the burned site, while decreased the severity of acute inflammatory response and amount of inflammatory cells comparing to control. The number of MSCs in bloodstream, representing the rate of MSCs migration, showed a 4-fold increase in the experimental group compared to control. Conclusions: The current study suggests the potential of intravenously administration of G-CSF as an effective strategy for treatment of severe burn injuries.

A topical ointment formulation containing leaves extract of Aegialitis rotundifolia Roxb., accelerates excision, incision and burn wound healing in rats

Abstract Background Aegialitis rotundifolia Roxb., is a small mangrove tree or shrub used traditionally as a potent cure for pain arising from various injuries. Presently, there is a single scientific report on the wound healing property of this mangrove species which has been performed in-vitro but there is no in vivo scientific evidence of the wound healing properties. Further, few reports have claimed that reduction of pain could accelerate wound healing process and thus, the present work deals with the development of a topical ointment formulation incorporated with Aegialitis rotundifolia Roxb., ethanolic leaves extract (ARELE) which could potentially accelerate healing of excision, incision and burn wound models in Wistar rats. Methods Topical ointment containing ARELE was first tested for their stability (90 days) and possible dermal toxicity using standard procedures. In the excision wound model, parameters such as in-vivo antioxidant, acute inflammatory marker (myeloperoxidase), wound microbial load, connective tissue parameters, and histopathology of healed skin were performed. Incision and burn (thermal and chemical) wounds were conducted following the standard methods. Results The ointment formulations were found to be stable and dermatologically non-toxic. In the excision wound model, a significant increase in percent wound contraction was observed for ARELE ointment treated groups which are substantiated by strong in-vivo antioxidant activity, increased collagen formation, almost normal skin histology, and reduced myeloperoxidase and microbial colonies. Strong wound breaking strength was observed in incision wound repair and a significant increase in percent wound closure in both thermal and chemical burn wound model was recorded for ARELE ointment treated groups. Conclusion Therefore, the topical application of ARELE ointment formulations showed remarkable excision, incision and burn wound healing in Wistar rats thus showing its potential as a promising wound healing agent.

Role of caveolin-1 in epidermal stem cells during burn wound healing in rats

Local transplantation of stem cells has therapeutic effects on skin damage but cannot provide satisfactory wound healing. Studies on the mechanisms underlying the therapeutic effects of stem cells on skin wound healing will be needed. Hence, in the present study, we explored the role of Caveolin-1 in epidermal stem cells (EpiSCs) in the modulation of wound healing. We first isolated EpiSCs from mouse skin tissues and established stable EpiSCs with overexpression of Caveolin-1 using a lentiviral construct. We then evaluated the epidermal growth factor (EGF)-induced cell proliferation ability using cell counting Kit-8 (CCK-8) assay and assessed EpiSC pluripotency by examining Nanog mRNA levels in EpiSCs. Furthermore, we treated mice with skin burn injury using EpiSCs with overexpression of Caveolin-1. Histological examinations were conducted to evaluate re-epithelialization, wound scores, cell proliferation and capillary density in wounds. We found that overexpression of Caveolin-1 in EpiSCs promoted EGF-induced cell proliferation ability and increased wound closure in a mouse model of skin burn injury. Histological evaluation demonstrated that overexpression of Caveolin-1 in EpiSCs promoted re-epithelialization in wounds, enhanced cellularity, and increased vasculature, as well as increased wound scores. Taken together, our results suggested that Caveolin-1 expression in the EpiSCs play a critical role in the regulation of EpiSC proliferation ability and alteration of EpiSC proliferation ability may be an effective approach in promoting EpiSC-based therapy in skin wound healing.

Investigation of eucalyptus essence 1% and its mixture with licorice gel 10% on the infected third-degree burn wound in rat model

Many people have irreversible defects and to be death due to burn wounds every year. The current study was conducted to assess the effects of eucalyptus essence (EE) and its mixture with licorice in burn wound healing in rats. One hundred fifty rats were divided to five equal groups. Twenty-four hours after induction of third-degree burn wound, inoculation of 108 colony-forming units of Pseudomonas aeruginosa (PA 103) into the burnt area was performed in form of subcutaneous. Group 1 was given no treatment, and group 2 received gel base. Group 3 (positive control) was treated with silver sulfadiazine (SSD). Groups 4 and 5 used EE 1% and its mixture with licorice gel 10%, respectively. After 3, 7, 14, 21, and 28 days, the animals were euthanized and the wound healing parameters were evaluated through macroscopic and microscopic examinations. Microscopically, the rats treated with EE and mixture gel showed better wound healing than SSD (P < 0.05). This was demonstrated by the increase in re-epithelialization rate and neovascularization moreover as expected and also macroscopic observation was completed on day 21. No infection was found in treatment groups. Finally, skin strength in EE group was better than other groups (P < 0.05). Enhanced wound contraction, histological features, and reduced reepithelialization time suggest that 1% EE may have therapeutic benefits in burn wound healing.

Bacterial cellulose membrane used as biological dressings on third-degree burns in rats.

Burn injuries represent a high risk of morbidity and mortality. The wound healing process is complex and requires the participation of different types of cells. Therefore, new biomaterials, which innovate the wound healing process, are being investigated. The aim of this study was to investigate the use of bacterial cellulose both in its pure state and enriched with lidocaine in full-thickness burns in rats. Thirty rats (Wistar) (260± 20gramas) divided into control group (CG), bacterial cellulose membrane group (MG) and bacterial cellulose membrane enriched with lidocaine group (MLG) were used. The burns were induced using a 150°C heated soldering iron, held on the animal neck for 10seconds. The biomaterial was applied immediately after injury and skin samples were collected on the tenth day of the treatment. The level of significance of p⩽0.05 was used for the conclusion of the statistical analysis. The groups treated with the biomaterials, a histological pattern compatible with a more advanced repair stage showing skin appendages, mild inflammatory infiltrate, better collagen fiber organization and mild immunostaining COX-2 and MMP-9 was observed, when compared to the control group that did not receive any type of treatment. Thus, was concluded that the bacterial cellulose-based biomaterial both in its pure state and enriched with lidocaine optimizing the full-thickness burn wound healing in rats.

The Effects of Adipose-Derived Stem Cell-Differentiated Adipocytes on Skin Burn Wound Healing in Rats.

Both adipose-derived stem cells (ADSCs) and fat grafting promote burn wound healing, but whether adipogen-derived cells using various inducers such as 3-isobutyl-1-methylxanthine (IBMX) and insulin affect wound healing is unknown. Herein, ADSC-differentiated adipogenic lineages were used in rat burn wounds to evaluate wound healing potential. ADSCs were cultivated using six different adipogenic differentiation conditions (IBMX ± insulin, IBMX for 5 days, high and low Dulbecco's modified Eagle's medium) and in vitro morphological changes and cell proliferations during adipogenic differentiation were recorded. Intermediate burn wounds were inflicted in 15 Wistar male rats. Afterwards, the rats were divided into five groups for subcutaneous injections under the wounds: control; ADSCs; differentiated adipocytes (-IBMX+INSULIN and +IBMX[D1-5]+INSULIN) and fat prepared by Coleman technique. Macroscopic changes and histology were documented for 3 weeks. Repeated measures analysis of variance was performed to analyze cell growth and wound healing with a statistical level set of P < .05. Induction cocktails significantly reduced proliferation and induced lipid droplet accumulation. Conditioning without insulin induced the least lipid accumulation, while discontinuing IBMX generated larger adipocytes (P < .001). Adipogenic differentiated ADSCs had similar wound healing abilities with ADSC and fat injections, but differentiated adipocytes (+IBMX[D1-5]+INSULIN) and fat grafting accelerated the early healing process relative to ADSC (P < .001). Reduced fibrosis and mild inflammatory infiltration limited to superficial dermis were observed in +IBMX(D1-5)+INSULIN and fat injection groups, while those reactions were mild to moderate in ADSC group. Differentiated adipocytes achieve similar wound healing results compared with ADSC and fat injections, but differentiated adipocytes (+IBMX[D1-5]+INSULIN) and fat grafting accelerate early healing relative to ADSC.

Comparing the effect of visceral fat and barley seed ash (hordeum vulgare L) with silversulfadiazine on burn wound healing in rats.

Skin burn is one of the most common complications and remains a major public health issue worldwide. This experiment was conducted to study the effects of traditional medicine (Visceral Fat and Barely Seed Ash) compared with silversulfadiazine (SSD) cream on healing burn wounds in rats. Sixty adult male Wistar rats were randomly divided into four groups of equal numbers; each group consisted of 15 animals. After sedation, type II of skin burn with 1.5 cm diameter circle was created on the back of rats with a heated metal in boiling water. Group one was not treated and considered as control. The burned areas in the second, third and fourth groups were applied twice a day with normal saline, SSD cream and traditional preparation, respectively. Percentage of the burn wound concentration and histopathological examinations were used as parameters of our study on days 4, 9and 14. Obtained data were compared between the groups and days. SSD cream and traditional preparation had better effects on burnt wound healing compared with control group. Furthermore, on the final day of study, the average percentage of wound concentration in traditional medicine group was significantly greater than other groups (P < 0.05). This finding was supported and confirmed by histological examination as well. Traditional preparation significantly decreased inflammation and accelerated wound healing in treated rats. Furthermore, the findings of this study can be applied clinically in the future.

InGaP 670-nm laser therapy combined with a hydroalcoholic extract of Solidago chilensis Meyen in burn injuries.

Therapies that accelerate the healing of burn injuries, improving the quality of life of the patient and reducing the cost of treatment are important. This study evaluated the effects of InGaP 670-nm laser therapy combined with a hydroalcoholic extract of Solidago chilensis leaves on burn wound healing in rats. Seventy-two rats were divided randomly into four groups: control untreated (C), treated with InGaP 670-nm laser with power density of 0.41 W/cm(2) and energy density of 4.93 J/cm(2) (L), treated with S. chilensis extract (S) and treated with S. chilensis extract and laser (LS). Second-degree burns were produced on the back of the animals with metal plate. Wound samples were collected on days 7, 14 and 21 of treatment for structural analysis, morphometry and Western blotting to quantify the expression of transforming growth factor beta 1 (TGF-β1) and vascular endothelial growth factor (VEGF). The results showed that InGaP laser irradiation at 670 nm alone and combined with extract of S. chilensis promoted significant tissue repair responses in this experimental model, increasing the number of fibroblasts, collagen fibres and newly formed blood vessels throughout the experimental period and decreasing the number of granulocytes in burn wounds of second degree in all treated groups. Exclusive treatment of burn wounds with the hydroalcoholic extract of S. chilensis provided similar quantitative results to those seen in the untreated group throughout the experimental period. Therefore, it was observed in the L and LS groups different responses in the expression of TGF-β1 and VEGF. The application of 670-nm laser alone or combined with the extract of S. chilensis promoted favourable responses in tissue repair of second-degree burns in this experimental model.