OBJECTIVE Influence of irradiation and phenytoin sodium on modulatory activities of wound fluid on proliferation of fibroblasts and collagen synthesis was studied. METHODS The male Wistar rats were used in this study. The rats were divided into irradiated and non-irradiated groups, and in each of them it was subdivided into phenytoin group and control. A 7 cm long incisional wound was made on the back of each rat, in which a polyvinyl alcohol sponge (PVAS) with a size of 1.0 cm x 0.4 cm was implanted into the wound and the wound was sutured up. The PVAS was prepared by rinsing in running water over night and then was boiled for 30 minutes. Before implantation, the sponge was immersed in phenytoin sodium solution (10 mg/l ml) or normal saline (as control). From each wound the wound fluid and fibroblasts were collected. The methods of incorporation of 3H were adopted to assess the proliferation of fibroblasts and synthesis of collagen. RESULTS It was shown that proliferation of fibroblasts and collagen synthesis were stimulated by wound fluid remarkably on 5 to 8 days after wounding, and that 6 Gy to total-body irradiation wound decrease this effect. It was also noted that topical phenytoin sodium increased the modulatory activity of wound fluid irrespective of being irradiated or not. CONCLUSION It could be drawn that, after total-body irradiation, stimulation of hyperplasia of fibroblasts and collagen synthesis by wound fluid was markedly lowered indicating the total-body irradiation resulted in changes of local conditions of the wound which was unbenefitted to repair of tissue cells, while phenytoin sodium could enhance the stimulating action of wound fluid on proliferation of fibroblasts and synthesis of collagen which was beneficial to wound healing.
Thirtysix patients with a total of 89 places of skin wounds which was involved with various depths of skin were treated by application of autogenous whole layer skin mash, in which the ratio betweenepidermis and dermis was 3∶1 and the ratio between the donor area and that of the recipient ranged from 1∶5 to 1∶20. The patients were followed from 6 months to 18 months. The results were excellent in 58, good in 15, fair in 11 and bad in 5. Different depths of the skin wounds such as superficial dermis, deep dermis, subcutis and deep fascia were responsible in seqence for the decreasing percentage of survival of the microcutaneous particle graft. It was shown that a considerably high survival might be obtained in both wounds down to fat or fascial layer.
To investigate the best way of using fibroblast growth factor (FGF) in wound healing, the following experiments were performed. Twelve Wistar rats were chosen. Four 1.5 cm x 1.5 cm middle-thick skin wounds were made in the back of each rat, 2 in each side, and labelled as number 1 to 4. Number 1 wound of each rat was used as control, only PBS was applied to the wound, 50 microliters per time, twice a day from the first day to 11th day. Number 2 wound was sustained medication group, 50 microliters 4 micrograms/ml FGF was applied twice a day from the first day to 11th day; Number 3 wound was early medication group, 50 microliters 8 micrograms/ml FGF was applied twice a day from the first day to 5th day; Number 4 wound was late medication group, 50 microliters 8 micrograms/ml FGF was added twice a day from the 5th day to 11th day. By day 4, 8, 12 and 16, the area of wounds were measured, and the healing time of each wound was recorded. The elastic fiber, collagen fiber and DNA content were measured by immunohistological method. The result showed that the elastic fiber, collagen fiber and DNA content in the groups of FGF used were more than those in the control group. The healing time of the control group was 14.4 days while that of the early meduation group was 13.4 days, late medation group was 13.5 days and sustained medication group was 12.2 days. It was suggested that FGF could accelerate the wound healing, and sustained use of FGF was the best way of giving the drug.
ObjectiveTo observe the growth characteristics of human umbilical cord mesenchymal stem cells (hUCMSCs) cultured on the alginate gel scaffolds and to explore the feasibility of hUCMSCs-alginate dressing for wound healing. MethodshUCMSCs were separated from human umbilical cords and cultured in vitro. After the 4th passage cells were co-cultured with alginate gel (experimental group), the cell growth characteristics were observed under the inverted phase contrast microscope. Vascular endothelial growth factor (VEGF) content was measured and the number of cells was counted at 0, 3, 6, and 9 days after culture; and the cell migration capacity was observed. The hUCMSCs were cultured without alginated gel as control. The model of full-thickness skin defects was established in 32 8-weekold Balb/c male mice and they were randomly divided into 4 groups (n=8): wounds were covered with hUCMSCsalginate gel compound (MSC-gel group), cell supernatants-alginate gel compound (CS-gel group), 10% FBS-alginate gel compound (FBS-gel group), and 0.01 mol/L PBS-alginate compound (PBS-gel group), respectively. Wound healing rates at 5, 10, and 15 days were observed and calculated; and the wound tissues were harvested for histological and immunohistochemical staining to assess new skin conditions at 15 days after operation. ResultshUCMSCs grew well with grape-like proliferation on the alginate gel, but no cell migration was observed at 7 days after cultivation. VEGF expression and cell number in experimental group were significantly less than those in control group at 3 days（P<0.05）; then they gradually increased, and VEGF expression and cell number were significantly more than those in control group at 9 days (P<0.05). The wound healing rates of MSC-gel and CS-gel groups were significantly higher than those of FBSgel and PBS-gel groups at 5, 10, and 15 days (P<0.05). The squamous epithelium, fibroblasts, sebaceous glands, capillaries and VEGF expression of the new skin in MSC-gel and CS-gel groups were significantly more than FBS-gel and PBS-gel groups (P<0.05). But there was no significance between MSC-gel and CS-gel groups (P>0.05). ConclusionhUCMSCs can continuously express VEGF in alginate gel, which is necessary for wound healing. The hUCMSCs-alginate compound is probably a good wound dressing.
OBJECTIVE: To observe the curative effects of basic fibroblast growth factor (bFGF) on anus wound healing. METHODS: From April 1996 to December 2000, out of 109 patients with anus trauma, hemorrhoidectomy or fistula resection, 68 were treated with bFGF as the experimental group, while 41 were treated routinely as the control group. The healing of the wound, the general and local reaction were observed. RESULTS: The healing time of the experimental group was(17.00 +/- 1.54) days while that of the control group was(20.00 +/- 1.16) days (P lt; 0.01). Three weeks after operation, the healing rates of the experimental and control groups were 97.1% and 87.8%, respectively (P lt; 0.01). No general or local detrimental reactions were found in two groups. CONCLUSION: Local application of bFGF can accelerate the healing of anus wound, and the patients have little pain.
ObjectiveTo explore the research progress of the cell sources and related signaling pathways of the wound-induced hair follicle neogenesis (WIHN) in recent years.MethodsThe literature related to WIHN in recent years was reviewed, and the cell sources and molecular mechanism were summarized and discussed.ResultsCurrent research shows that WIHN is a rare regeneration phenomenon in the skin of adult mammals, with multiple cell origins, both hair follicle stem cells and epithelial stem cells around the wound. Its molecular mechanism is complicated, which is regulated by many signaling pathways. Besides, the process is closely related to the immune response, the immunocytes and their related cytokines provide suitable conditions for this process.ConclusionThere are still many unsolved problems on the cellular origins and molecular mechanisms of the WIHN. Further study on the mechanisms will enhance the understanding of adult mammals’ hair follicle regeneration and may provide new strategy for functional healing of the human skin.
OBJECTIVE: To seek a simple, safe and effective method for the instant repair of soft-tissue defects after excision of superficial tumor, chronic ulcer and scar constructure as well as injury. METHODS: From August 1993 to October 1997, according to the location and size of the lesion, adjacent single or double reverse tongue-shaped skin flaps were designed to repair the defects of head, face, limb and shoulder in 31 cases, and the donor sites were closed directly. RESULTS: The wounds were healed by first intention and the skin flaps were all survived postoperatively. CONCLUSION: It suggests that the tongue-shaped flap have the following characteristics: abundant blood supply, high survival rate, wide application, less trauma, and adjacent tissue can be fully used. It is a simple, safe and effective method for the instant repair of soft-tissue defects.
PURPOSE:In search of the mechanism for photic retinal injury. METHODS:A visible light damage model was established in the primary cultured healthy,adult human RPE cells by using intense fluorescence light (2 400 Lx). RESULTS:Electron microscopy revealed swelling of the mitochondria and obscurity of nuclear membranous structure in the light damaged cells. The decrease or dissolution of organelle,vacuolization of cytoplasm and myelinic degeneration were found in some severely damaged cells. The level of intracellular SOD was decreased to 41% of that of the controls (P＜0.05). CONCLUSION:The structure of the RPE was damaged by the light radiation and the level of intracellular SOD was decreased. These suggested the light damage might be associated with the production of free radicals and the lipid perioxide reaction in membranous structure of cell. （Chin J Ocul Fundus Dis,1996,12: 174-175 ）
OBJECTIVE: To summarize the application of simple skin traction technique in repair of soft tissue defect of limb. METHODS: From 1999, 42 cases of soft tissue defect of limbs were repaired by simple skin traction technique instantly; the defect area ranged from 2.5 cm x 2.0 cm to 8.0 cm x 6.5 cm. RESULTS: The soft tissue defect less than 8.0 cm can be sutured instantly. All of the wound achieved primary healing without infection and necrosis of skin edge, the circulation and sensation of limbs were normal; healing time was 10 days to 16 days, 12.8 days on average. Thirty-two cases were followed up for 6 months; the shape and function recovered well. CONCLUSION: Simple skin traction technique is a good option to repair the soft tissue defect of limbs.
OBJECTIVE This paper aims to explore the new method of continuous delivery of epidermal growth factor to wounds by transfected fibroblasts to promote wound repair. METHODS It was constructed a novel chimeric expression plasmid in which the biologically active portion of the human epidermal growth factor (EGF) gene was fused in-frame to the human granulocyte colony-stimulating factor signal sequence. RESULTS Clonally selected human fibroblasts transfected with this construct could secrete biologically active EGF. After the transplantation of irradiated gene-transfected fibroblasts suspended in fibrin glue to murine full-thickness wounds, EGF could be demonstrated for at least seven days in the wounds, slowly decreasing from initially 470 ng/L to 140 ng/L in 7 days. No EGF was found in the wound at 14 days. CONCLUSION A single application of irradiated EGF gene transfected fibroblasts to wounds can continuously deliver the transgene in vivo and can be used to administer drugs to the wound bed during the crucial first seven days of wound-healing.