Browsing by Subject "epithelization"
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Item The effects of acetylcholine and propolis extract on corneal epithelial wound healing in rats(Lippincott Williams and Wilkins, 1999) Öztürk F.; Kurt E.; Inan U.U.; Emiroǧlu L.; Ilker S.S.Purpose. To investigate the effects of topical acetylcholine and topical administration of propolis, a natural beehive product, on corneal epithelial wound healing. Methods. The whole corneal epithelium was debrided in 42 eyes of 21 rats by mechanical scraping with a dulled scalpel blade. Animals were divided into three groups. Group 1 received topical 1% water extract of propolis (WEP), group 2 received topical acetylcholine (ACh), and group 3 (control group) received topical phosphate-buffered saline, 6 times a day for 3 days, starting immediately after debridement. The area of the corneal epithelial defect was stained with fluorescein, photographed, and then measured every 12 h. The mean epithelial defect area and the mean percentage of epithelial defect remaining at each follow-up were compared between the groups. Results. The mean epithelial defect area and the mean percentage of epithelial defect remaining at each time were significantly smaller (p < 0.001, p < 0.05, respectively) in the ACh and propolis groups as compared with control groups. There was no statistically significant difference between the propolis or ACh groups at any time (p > 0.05). At 72 h, the mean percentage of defect remaining was 2.58% in the ACh group, 1.3% in the propolis-treated group, and 8.68% in the control group. Conclusions. This study demonstrated that ACh and propolis facilitated corneal epithelial wound healing of rats. Although the mechanisms of the effect of propolis on wound healing and its clinical use still remain to be determined, ACh may have a place in the treatment of corneal epithelial injuries.Item Histopathological evaluation of the urethra after the Snodgrass operation: An experimental study in rabbits(2002) Genç A.; Taneli C.; Günşar C.; Türkdoǧan P.; Yilmaz O.; Arslan O.A.; Mir E.Objective: To investigate the histopathological outcome of the incised urethral plate after tubularized incised-plate urethroplasty (the Snodgrass procedure to repair hypospadias) in a hypospadiac rabbit model, as it can produce meatal and neourethral strictures, and healing with scarring. Materials and methods: The study comprised 10 male New Zealand White rabbits (2.2-2.4 kg); under general anaesthesia the ventral urethra was completely excised 1 cm from the meatus proximally and a model of hypospadias formed. A full-thickness incision was then made in the distal dorsal urethra and the two sides of the incision marked by Indian ink tattooing. After placing a feeding tube (5 F) as a urethral catheter, both urethral wings were sutured ventrally by a 7/0 polydioxanone running suture, and the penile skin approximated by 5/0 chromic catgut. At 21 days and 3 months after surgery the penises were harvested. assessed histopathologically, and compared with those from control untreated rabbits of the same age and weight. Results: In the study group the incised area of the dorsal urethra was re-epithelialized; the regional tissue and vascularity were normal. Conclusion: In this rabbit model the dorsal urethral incisions healed with no scar tissue: only the ventral suture lines had minimal fibrosis and inflammatory reaction.Item Biochemical analysis of urethral collagen content after tubularized incised plate urethroplasty: An experimental study in rabbits(Springer Verlag, 2004) Taneli F.; Ulman C.; Genc A.; Yilmaz O.; Taneli C.The aim of the present study was the biochemical analysis of tissue hydroxyproline levels in incised urethral plates in order to show the total collagen content after the Snodgrass operation in the hypospadiac rabbit model. The study comprised 21 male New Zealand rabbits, (2.2-2.4 kg). The animals were randomly allocated to three groups each containing seven rabbits as follows: group 1, the ventral urethra was completely excised and a model of hypospadias formed. A full-thickness incision was made on the distal dorsal urethra, a feeding tube was placed as an urethral catheter and both urethral wings were sutured ventrally. Group 2, inserting an iris knife into the urethra, the ventral wall was incised mimicking an urethrotome. Group 3 consisted of normal control rabbits to determine the basal tissue hydroxyproline level. A slight increase in the hydroxyproline level was observed in the ventral part of the urethral tissue compared to the dorsal part in both groups 1 and 2; however, these differences were not significant. After the Snodgrass operation in the rabbit model, no significant differences were observed in the hydroxyproline levels of the dorsal and ventral parts of the urethra or between these and of the controls. Further studies are required in order to determine the mechanism underlying urethral healing through normal re-epithelization without excess collagen deposition after incised urethral plate urethroplasty.Item Isotretinoin-induced effects of mast cells on wound healing(2010) Gencoglan G.; Tosun M.; Gencoglan O.Wound healing is a complex process, and the role of retinoids in wounds is confusing and controversial. In this study, the authors aimed to evaluate the role of oral isotretinoin on mast cells, collagen production and remodeling in the wound healing process. In the first group 2 mg/kg/day isotretinoin dissolved in sunflower oil were administrated for 28 days. In the second group, only sunflower oil was administered. At the end of first week, four incisions were made on rats' back. In the seventh (group 1a and 2a), fourteenth (group 1b and 2b) and twenty-first (group 1c and 2c) days, the skin biopsies were taken from around of the incision areas from both groups. The authors revealed that isotretinoin administration permanently accelerates mast cell accumulation parallel to days in the wound area. The histological features of wound healing in isotretinoin administered rats were faster and better than the group 2. Copyright © 2010 Journal of Drugs in Dermatology.Item The effect of a special amino acid mixture on healing of left colonic anastomosis: An experimental study; [Özel amino asit karışımının sol kolon anastomozunun İyileşmesindeki etkisi: Deneysel çalışma](Turkiye Klinikleri, 2013) Yaman I.; Kara C.; Derici H.; Diniz G.; Ortaç R.; Özyurt B.C.Objective: Arginine, glutamine, and Beta-hydroxy-beta-methylbutyrate were combined in a dietary supplement. This specialized amino acid mixture enhances wound collagen accumulation and increases wound healing. We aimed to investigate the effects of this special amino acid mixture on the healing process of experimental left colonic anastomosis. Material and Methods: The study included 20 adult male Wistar-Albino rats. The study group (n=10) received 685 mg/kg/day specialized amino acid mixture for 7 days until 12 h before surgery and was maintained throughout the study. Following midline laparatomy a 1-cm segment of the left colon was resected. Bowel continuity was restored with an end-to-end anastomosis. The animals were re-anesthetized on day 7 after the operation and anastomotic bursting pressure was measured by passing a catheter per anum up to the area of anastomosis. Anastomotic segments were removed en bloc and were vertically divided into two. One was used for hydroxyproline measurement and the other for histopathological examination. Abramov's histologic scoring system was used in this study. Results: The hydroxyproline levels and bursting pressures in the study group were superior compared to the control group. Collagen deposition and reepithelization scores of the study group were higher than that of the control group. Conclusion: Results of the present study indicates that significantly enhancing the anastomotic bursting pressure, hydroxyproline level and collagen deposition may improve anastomosis healing. © 2013 by Türkiye Klinikleri.Item The effect of human recombinant epidermal growth factor on neovascularization and pedicle division time in a rat interpolation flap model(Turkiye Klinikleri, 2024) Parspanci A.; Keçeci Y.; Temiz P.Background/aim: In practice, waiting 2–3 weeks for interpolation flaps pedicle division result in certain morbidities and discomfort for patient. The division time of flap pedicle depends on neovascularization from the recipient bed and includes wound healing stages. We aimed to investigate the effect of recombinant human epidermal growth factor (rhEGF) on the flap viability during early pedicle division. Materials and methods: Thirty-six rats were allocated to two main groups as control and study. A cranial based flap measuring 5 × 5 cm was elevated from the back, including all layers of the skin. While the cranial half of the defect was primarily closed, the flap was inset into the distal half. In the study group, a single dose of 20 µg EGF was injected into the recipient site and wound edges before the flap inset. The control group received no treatment. Each main group was divided into three subgroups based on pedicle division time of 8, 11 and 14 days. After pedicle division, each flap was monitored and photographed for 7 days, and histopathological samples were collected. Viable and necrotic areas were compared, and flaps were examined histopathologically. Results: The necrosis area in the study group on the 11th day was significantly lower than that in the control group. The fibroblastic activity, granulation tissue and neovascularization on the 8th day, the granulation tissue level on the 11th day, and the neovascularization level on the 14th day were significantly higher in the study groups. Conclusion: Following the application of EGF, the necrosis area decreased within the study group. Histopathological assessments revealed a statistically significant increase in parameters related to granulation tissue and fibroblastic activity, notably neovascularization, across all subgroups within the study. It was concluded that the use of EGF positively affected the neovascularization, and flaps could be divided earlier. © TÜBİTAK.