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    The Effects of Different Burn Dressings on Length of Telomere and Expression of Telomerase in Children With Thermal Burns
    (Oxford Univ Press, 2019) Gurunluoglu, Kubilay; Demircan, Mehmet; Koc, Ahmet; Kocbiyik, Alper; Tasci, Aytac; Durmus, Kubra; Gurunluoglu, Semra
    Background: Burns are a common traumatic injury triggered by local tissue damage and a systemic response. In this study, we evaluated the effects of different burn dressings on telomere kinetics in children with thermal burn injury. Methods: Sixty children with thermal burn were included in this prospective study. The burn area of the patients included 20 to 50% total body surface area. Three different dressings (hydrofiber with silver [HFAg], poylactic membrane [PLM], and silver sulfadiazine [SSD]) and control groups were created. Telomere length in nucleated blood cells and telomerase expression in the skin tissue were evaluated in control and burn groups. Results: In the whole burn groups, telomere length in blood cells increased. The length of telomeres increased the most in the SSD group. The PLM group is the treatment that increases the number of squamous cell counts in the basal layer and telomerase expression in the skin. In HFAg and SSD groups, the expression of telomerase in the skin is decreased. In the HFAg group, the basal layer in the skin was also reduced in squamous cells. Conclusion: In all burn groups, the telomere length of nucleated cells in the blood was higher than in the control group. SSD dressing along with autografting is the treatment method that maximizes telomere length in blood cells. The PLM has the most increased telomerase expression in the skin of burned patients. The PLM application increases the number of cells on both burned and normal skin.
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    The effects of total parenteral nutrition on telomerase expression in rabbit
    (2018) Gurunluoglu, Kubilay; Bayrakci, Ercan; Gokce, Hasan; Kocbiyik, Alper; Taskapan, Cagatay; Tasci, Aytac; Aksungur, Zeynep; Arslan, Ahmet Kadir; Demircan, Mehmet
    Abstract Aim: Total parenteral nutrition (TPN) is a technique which is use to give vitally mandatory substances in to the venous compartments whenever the gastrointestinal system cannot be used by the patients. Telomerase catalyzes DNA synthesis, which is necessary to maintain telomere length and stabilize the genome to allow continued cell proliferation. In this study, we explored the effects of TPN administration on telomerase reverse transcriptase (TERT) expression in various tissue and serum telomerase level. Material and Methods: In this study a number of 42 same-aged albino, equal number of male and female, new zealand rabbits were use, divided in to three groups. Group 1 rabbits received TPN for 10 days via a central venous catheter. Group 2 received 50 mL/ kg/day physiological saline via a central venous catheter. Group 3 served as the control group. The rabbits were sacrificed after 10 days, and serum telomerase levels were measured by enzyme-linked immunosorbent assay. TERT expression in gonadal, liver, jejunum, and skin tissues were determined immunohistochemically. Blood samples were obtained before and after TPN and saline administration in the TPN and serum saline groups, respectively, and at the end of the experiment in the control group. Results: Telomerase expression in liver, gonads and serum level of TPN group was significantly higher than control and serum saline groups. Conclusion: TPN may be a positive effect in liver and gonadal telomer kinetic. However, we think that TPN increases DNA damage throughout the body.
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    Glial Cell Line-Derived Neurotrophic Factor, S-100 Protein and Synaptophysin Expression in Biliary Atresia Gallbladder Tissue
    (Korean Soc Pediatric Gastroenterology & Nutrition, 2021) Gurunluoglu, Semra; Ceran, Canan; Gurunluoglu, Kubilay; Kocbiyik, Alper; Gul, Mehmet; Yildiz, Turan; Bag, Harika Gozukara
    Purpose: Biliary atresia (BA) is a disease that manifests as jaundice after birth and leads to progressive destruction of the ductal system in the liver. The aim of this study was to investigate histopathological changes and immunohistochemically examine the expression of glial cell line-derived neurotrophic factor (GDNF), synaptophysin, and S-100 protein in the gallbladder of BA patients. Methods: The study included a BA group of 29 patients and a control group of 41 children with cholecystectomy. Gallbladder tissue removed during surgery was obtained and examined immunohistochemically and histopathologically. Tissue samples of both groups were immunohistochemically assessed in terms of GDNF, S-100 protein, and synaptophysin expression. Expression was classified as present or absent. Inflammatory activity assessment with hematoxylin and eosin staining and fibrosis assessment with Masson's trichrome staining were performed for tissue sample sections of both groups. Results: Ganglion cells were not present in gallbladder tissue samples of the BA group. Immunohistochemically, GDNF, synaptophysin, and S-100 expression was not detected in the BA group. Histopathological examination revealed more frequent fibrosis and slightly higher inflammatory activity in the BA than in the control group. Conclusion: We speculate that GDNF expression will no longer continue in this region, when the damage caused by inflammation of the extrahepatic bile ducts reaches a critical threshold. The study's findings may represent a missing link in the chain of events forming the etiology of BA and may be helpful in its diagnosis.
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    Histopathological and ultra-structural investigation of the damaging effects of hypoinsulinemia, hyper glycaemia and oxidative stress caused by parenteral nutrition combined with fasting on the small intestine of rabbits
    (Elsevier, 2023) Gurunluoglu, Semra; Gul, Mehmet; Gurunluoglu, Kubilay; Kocbiyik, Alper; Gul, Semir; Bag, Harika Gozukara; Uremis, Muhammed Mehdi
    Background and study aims: Parenteral nutrition (PN) is a life-saving practice when the use of the gastrointestinal tract is not appropriate. Despite its great benefits, however, PN may cause several complications. In this study, we conducted histopathological and ultra-structural examinations of the effect of PN combined with starvation on the small intestines of rabbits.Materials and methods: Rabbits were divided into four groups. A fasting + PN group was left completely unfed and received all its daily required energy by PN through an intravenous central catheter. An oral feeding + PN group received half the necessary daily calories by oral feeding and the other half through PN. A semi-starvation group received only half the necessary daily calories by oral feeding and no PN. The fourth group, serving as a control, was supplied with its entire daily energy requirements through oral feeding. After 10 days, the rabbits were euthanized. Blood and small intestine tissue samples were collected from all groups. Blood samples were bio-chemically analysed, and tissue samples were examined by light and transmission electron microscopy.Results: The fasting + PN group exhibited lower insulin levels, higher glucose levels, and increased systemic oxidative stress than the other groups. Ultra-structural and histopathological examinations revealed a significant increase in apoptotic activity in this group's small intestines and a significant decrease in villus length and crypt depth. Severe damage to the intracellular organelles and nuclei of enterocytes was also observed.Conclusion: PN combined with starvation appears to cause apoptosis in the small intestine due to oxidative stress and hyperglycaemia with hypoinsulinemia, with destructive effects on small intestine tissue. Adding enteral nutrition to PN may reduce these destructive effects.
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    Impaction of the polylactic membrane or hydrofiber with silver dressings on the interleukin-6, tumor necrosis factor-?, transforming growth factor-?3 levels in the blood and tissues of pediatric patients with burns
    (Turkish Assoc Trauma Emergency Surgery, 2021) Demircan, Mehmet; Gurunluoglu, Kubilay; Bag, Harika Gozde Gozukara; Kocbiyik, Alper; Gul, Mehmet; Uremis, Nuray; Gul, Semir
    BACKGROUND: We aimed to evaluate the effects of two different burn dressings, hydrofiber with a silver (HFAg) and polylactic membrane (PLM), on altering the levels of important biomarkers Interleukin-6 (IL-6), Tumor necrosis factor-alpha (TNF-alpha), Transforming growth factor-beta(3) (TGF-beta(3)) in blood and burnt tissue in children with second-degree burns. METHODS: Children between the ages of one to 16 years, with 25-50% second-degree partial-thickness burns of the total body surface area were included in this study. Patients in the PLM group were dressed with PLM in a typical way according to the manual. The HFAg group was dressed with HFAg and a sterile cover. During and at the end of the 21-day treatment, blood and skin tissue samples were taken from the two burn and control groups. IL-6, TNF-alpha, and TGF-beta beta(3) levels were evaluated in blood and tissue samples from all groups, and the results were analyzed statistically. RESULTS: In the PLM group, IL-6 and TNF-alpha levels decreased early days in both serum and tissue samples to reach normal ranges compared with the HFAg group. In the PLM group, TGF-beta(3) levels were elevated than in other groups for two weeks. CONCLUSION: In this study, we found that PLM controls inflammation earlier in both systemic and burn tissue. We also found that PLM increased the level of TGF-beta(3), which may be associated with the prevention of the development of hypertrophic scar in the burn wound, in the blood and burn tissue during this study.
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    Investigation of the cardiotoxic effects of parenteral nutrition in rabbits
    (W B Saunders Co-Elsevier Inc, 2020) Gurunluoglu, Kubilay; Gul, Mehmet; Kocbiyik, Alper; Koc, Ahmet; Uremis, Nuray; Gurunluoglu, Semra; Bag, Harika Gozukara
    Introduction: Parenteral nutrition (PN) is used for the intravenous delivery of nutrients to patients who cannot take food orally. However, it is not clear whether PN also negatively impacts cardiac tissue. The present empirical study investigated the cardiac effects of PN in rabbits. Methods: The effects of PN were examined in three groups of rabbits: animals in the PN + fasting group (n = 14) had been fully fasted before receiving a full PN dose via an intravenous central catheter; the PN + oral feeding group (n = 14) received half of the daily calorie requirement as a half dose of PN via an intravenous central catheter; the third group consisted of controls (n = 14) with full enteral feeding and full enteral fluid intake with no PN and no central venous catheter. Al the end of the 10-day study period, the rabbits were subjected to echocardiographic examination and euthanized. Blood and tissue samples were obtained from all groups. DNA was isolated from nucleated blood cells. Tissue samples were examined by both light and electron microscopy, relative telomere length was determined from DNA, and blood samples were analyzed biochemically. Results: At the end of the study, there were no statistically significant differences in weight change between the three groups. Echocardiography revealed minimally impaired diastolic function in the PN + fasting group compared to the other groups. Biochemical and histopathological analyses, relative telomere length determination, and electron micrographs showed significant cardiac damage in the PN + fasting group but not in the PN + oral feeding group or the control group. The blood biochemical analyses showed hyperglycemia and a low insulin level in the PN + fasting group but not in the other two groups. Conclusions: A combination of PN and fasting may damage the cardiac muscle cells of rabbits via a mechanism involving hyperglycemia and oxidative stress. Additional enteral feeding may protect against the destructive effects of PN on cardiac tissue. (C) 2019 Elsevier Inc. All rights reserved.