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Öğe 3?,4?-Dihydroxyflavonol (DiOHF) prevents DNA damage, lipid peroxidation and inflammation in ovarian ischaemia-reperfusion injury of rats(Taylor & Francis Inc, 2022) Agartan, Elif Sena; Mogulkoc, Rasim; Baltaci, Abdulkerim Kasim; Menevse, Esma; Dasdelen, Dervis; Avunduk, Mustafa CihatThis study aimed to determine the effect of 3',4'-Dihydroxyflavonol (DiOHF) on lipid peroxidation, DNA damage and inflammation in ovarian ischaemia (I)-reperfusion (R) injury. This study was performed on 44 Wistar-albino female rats. Groups were designed as Control; Sham; I/R (the left ovary was ligated for 2 h and then reperfused for 2 h); I/R + DiOHF (after 2 h ischaemia and 2 h reperfusion, 30 mg/kg of DiOHF was given intraperitoneally and reperfusion was allowed for 2 h more); I + DiOHF + R (after 2 h I, 30 mg/kg of DiOHF was given at the beginning of 2 h reperfusion); DiOHF + I/R (2 h after DiOHF administration, the left ovary was ligated for 2 h and then reperfused for 2 h). Blood and ovarian tissue samples were analysed for GSH, MDA, 8-OHdG, SOD, and IL-6. Ovarian tissue was examined histopathologically. Ovarian I/R has led to inflammation and oxidative damage. However, DiOHF activated the antioxidant system and prevented DNA damage induced by I/R in ovarian tissue. Vascularisation, oedema, and inflammation also occurred in ovarian tissue in I/R group. The results of this study indicated that I/R led to disturbance of the oxidant/antioxidant system balance and increased DNA damage; however, DiOHF supplementation prevented DNA damage, lipid peroxidation and inflammation by increasing the antioxidant system in ovarian I/R injury in rats. However, in potential I/R situations, DiOHF application appears to be beneficial in reducing inflammation, oxidant injury, and DNA damage, and in activating the antioxidant system. IMPACT STATEMENT What is already known on this subject? Ischaemia/reperfusion (I/R) injuries lead to damage in cells or tissues due to insufficient blood flow. What do the results of this study add? Increased DNA injury and inflammatory response (IL-6) and structural impairment were treated by administration of intraperitoneal (DiOHF) which strongly stimulated the antioxidant system, inhibited antioxidant activities, prevented DNA damage and inflammation process. What are the implications of these findings for clinical practice and/or further research? This study's strength is that it is the first research demonstrates the prevention of DNA damage in ovarian I/R by DiOHF supplementation. This flavonoid (DiOHF) may be used for treatment in different ovarian ischaemia/reperfusion.Öğe A Comparison Between Hyaluronic Acid Filler and Dermofat Grafts With or Without Tie-Over Dressing for Lip Augmentation(Lippincott Williams & Wilkins, 2024) Ince, Bilsev; Zuhour, Moath; Kadiyoran, Cengiz; Avunduk, Mustafa Cihat; Dadaci, MehmetBACKGROUND There are many different autologous grafts used for lip augmentation, such as fat, fascia, or dermofat grafts (DFG). However, filling with synthetic materials such as hyaluronic acid (HA) fillers is the most preferred method.OBJECTIVE The authors aimed to compare DFG with HA fillers regarding cost, permanence, complication rate, gained volume, and satisfaction rate. The authors investigated the effect of tie-over dressings on the viability of DFG.PATIENTS AND METHODS Patients who received hyaluronic acid fillers were referred to as Group H. Patients who received grafts without tie-over and with tie-over dressings formed Groups D1 and D2, respectively. The lip index (LI) was used for volume comparisons. The viable area of the grafts was measured using ultrasound imaging.RESULTS At postoperative month 6, the only significant difference was found between Group D1 and Group D2 (p < .05). At the postoperative first year, Groups D1 and D2 had a statistically higher LI value compared with Group H. Group D2 had a higher viable area than Group D2 (p < .05). Group H and Group D2 showed higher satisfaction scores than Group D1 (p < .05).CONCLUSION Dermofat grafts with or without tie-over dressings can be considered a reliable and inexpensive choice for patients who seek a more permanent procedure. Tie-over dressings increase the predictability of DFG and reduce the need for overcorrection.Öğe Comparison of the Effects of Two Different Analgesics on Bone Regeneration During Mandibular Distraction Osteogenesis(Lippincott Williams & Wilkins, 2019) Sabuncuoglu, Fidan Alakus; Ersahan, Seyda; Amasyali, Mihri; Avunduk, Mustafa CihatIntroduction: Mandibular distraction osteogenesis (DO) is frequently used in the management of bone defects and craniofacial deformities, with analgesics commonly administered to relieve acute postoperative pain. This experimental animal study investigated the effects of 2 analgesics, acetaminophen and acemetacin, on bone regeneration after DO. Materials and methods: This study was conducted with 14 mature male New Zealand rabbits (2.8-3.2 kg) randomized into 2 groups of 7. Mandibular osteotomies were performed under optimal operating conditions, and a custom-made distractor was applied to the mandible of each subject, with distraction initiated after a 5-day latency period at a rate of 1.0 mm/d (2 x 0.5 mm/d) for 10 days. Analgesics were administered via oral gavage during the latency period and for the first 5 days of the distraction period for 10 days in total, with group I receiving acetaminophen (200 mg/kg/d) and group II receiving acemetacin (5 mg/kg/d). Subjects were sacrificed and their mandibles dissected at the end of 4 weeks postoperatively. Bone mineral density (BMD) and bone mineral content (BMC) were measured using dual-energy X-ray absorptiometry (DEXA), and histomorphometric analysiswas performed to evaluate the quality of newly formed bone. Paired group comparisons of non-normally distributed numerical variables were made using the Mann-Whitney U test, with a P value of <0.05 considered statistically significant. Results: No significant differences in BMC and BMD values of intact bone, newly formed bone, or bone around the pin site were observed between the 2 groups. Histometric analysis also indicated acetaminophen and acemetacin to have similar effects on bone regeneration during distraction. Conclusion: Acemetacin may be an alternative to acetaminophen for treating pain associated with DO, given the similarities in the effects of the 2 analgesics on bone regeneration. However, this finding should be supported by further experimental and human studies.Öğe Comparison of the Efficacy of Homologous and Autologous Platelet-Rich Plasma (PRP) for Treating Androgenic Alopecia(Springer, 2018) Ince, Bilsev; Yildirim, Mehmet Emin Cem; Dadaci, Mehmet; Avunduk, Mustafa Cihat; Savaci, NedimAndrogenetic alopecia (AGA), the most common cause of hair loss in both sexes, accounts for 95% of all cases of hair loss. Although the literature has suggested that both nonactivated (n-PRP) and activated autologous (a-PRP) PRP can be used to treat AGA, we did not find any study investigating the use of homologous PRP (h-PRP) for this purpose. Also, to the best of our knowledge, there are no studies comparing the efficacy of h-PRP, a-PRP, or n-PRP on AGA therapy. The aim of this study was to compare the increase in hair density, average number of platelets, complications, preparation, and duration of application in the treatment of AGA using a-PRP, n-PRP, and h-PRP. Between 2014 and 2015, we studied male patients who had experienced increased hair loss in the last year. Patients were divided into three groups: Group 1 received n-PRP, Group 2 received active PRP, and Group 3 received h-PRP. For Group 1, PRP was prepared by a single centrifugation prepared from the patient's own blood. For Group 2, the PRP was prepared from the patient's own blood, but a second centrifugation was applied for platelet activation with calcium chloride. For Group 3, the PRP was prepared from pooled platelets with the same blood group as the patient from the blood center. PRP was injected at 1, 2, and 6 months. The hair density (n/cm(2)) of each patient before and after injection was calculated. Each patient was assigned a fixed evaluation point at the time of application to calculate hair density. At 2, 6, and 12 months after the first treatment, the increase in hair density was calculated as 11.2, 26.1, and 32.4%, respectively, in Group 1; 8.1, 12.5, and 20.8%, respectively, in Group 2; and 16.09, 36.41, and 41.76%, respectively, in Group 3. The increase in hair density was statistically significantly greater in Group 1 than in Group 2 and more so in Group 3 than in both groups among all controls (p < 0.05). The efficacy of both PRPs was determined in AGA treatment in our study. However, it was determined statistically that the increase in hair density with h-PRP was greater than with autologous PRP groups. We believe that h-PRP therapy can be used in patients with AGA presenting with hair loss.Öğe Does Estradiol Level in Platelet-Rich Plasma Improve Efficacy of Androgenic Alopecia Treatment?(Oxford Univ Press Inc, 2020) Ince, Bilsev; Kendir, Munur Selcuk; Kilinc, Ibrahim; Avunduk, Mustafa Cihat; Dadaci, Mehmet; Savaci, NedimBackground: Although some studies in the literature report that autologous and homologous platelet-rich plasma (PRP) can be employed in the treatment of androgenic alopecia (AGA), no study, to the authors' knowledge, has examined the estrogen concentration of prepared PRP. Objectives: The authors aimed to determine the presence of estrogen in PRP and to investigate the effect of estrogen concentration of PRP on AGA treatment. Methods: Between 2017 and 2018, 30 male patients with hair loss complaints were included in this prospective study. Autologous PRP was injected in patients in Group 1. Homologous PRP with high estrogen levels was injected in the patients in Group 2. PRP was injected in both groups 4 times at 0,1, 3, and 6 months. The obtained photographs were evaluated and hair densities of each patient at controls were calculated. Results: The mean estrogen level measured in PRP was statistically significantly higher in Group 2. In both groups, the increase in hair density was observed from the first month, but this increase was statistically significantly higher in all controls in Group 2. In Group 2, there was a statistically significant increase in the 1st and 3rd months compared with the previous control, but there was no difference between the 6th and 12th months and the 3rd month. Conclusions: Increased hair density is greater and earlier in the group receiving estrogen-rich PRP than in the group utilizing autologous PRP. The authors think that estrogen-rich PRP may be employed in the treatment of AGA in the presence of an appropriate donor.Öğe The effect of costal cartilage resection on the chest wall development: Pathological evaluation(European Respiratory Soc Journals Ltd, 2015) Calik, Mustafa; Calik, Saniye Goknil; Avunduk, Mustafa Cihat; Aribas, Olgun Kadir[Abstract Not Availabe]Öğe Effect of local rifamycin application on expression of BMP-2 and bone regeneration(2017) Esen, Hacı Hasan; Avunduk, Mustafa Cihat; Ün, Emin; Özeç, İlker; Taşdemir, Ufuk; Kırtay, MustafaAmaç: Bu çalışmanın amacı lokal rifamisin uygulamasının kemik iyileşmesi sırasında BMP-2 salınımı üzerine etkisinin değerlendirilmesidir. Materyal ve method: Rat mandibula angulus bölgesinde standart olarak 5 mm çapında kritik boyutta kemik defektleri oluşturulmuştur. Kontrol grubunda (8 rat) defektlere herhangi bir uygulama yapılmamıştır. Birinci deney grubunda (8 rat) defekt bölgesi rifamisin solüsyonu ile irrige edildikten sonra, defekt bölgesine 1, 3 ve 7. günlerde 25 mg rifamisin solüsyonu enjekte edilmiştir. İkinci deney grubunda (8 rat) defekt bölgesi 25 mg rifamisin solüsyonu ile karıştırılmış gelatin sponge ile greftlenmiştir. Cerrahiden 21 gün sonra ratlar sakrifiye edilmiştir. Defekt bölgesinden hem immünhistokimyasal analiz (kemik morfogenetik protein-2 antibody) için hem de histomorfometrik analiz için histolojik kesitler hazırlanmıştır. Elde edilen verilerin analizi Mann Whitney U ve Kruskall Wallis testi kullanılarak yapılmıştır. Bulgular: Deney grubunda kontrol grubuna göre ortalama yeni kemik formasyonu, osteoblast sayısı ve yeni damar oluşum sayısında artış olduğu görülmüştür. Her iki deney grubunda da anti-BMP-2 ile işaretlenmenin (hücre sayma) kontrol grubuna göre daha fazla olduğu görülmüştür. Sonuç: Kritik boyutta kemik defektlerine lokal olarak rifamisin uygulamasının BMP-2 salınımı üzerine pozitif etkileri olduğu tespit edilmiştir.Öğe The Effect of Pinealectomy and Melatonin Application on Metallothionin, ZnT3 and ZIP2 Levels in Rat Brain Tissue(Karger, 2018) Deniz, Arife; Baltaci, Saltuk Bugra; Baltaci, Abdulkerim Kasim; Mogulkoc, Rasim; Avunduk, Mustafa Cihat[Abstract Not Availabe]Öğe Effect of pinealectomy and melatonin supplementation on metallothionein, ZnT2, ZIP2, ZIP4 and zinc levels in rat small intestine(Taylor & Francis Ltd, 2021) Unal, Omer; Baltaci, Abdulkerim Kasim; Mogulkoc, Rasim; Avunduk, Mustafa CihatWe investigated the relations among levels of metallothionein (MT); zinc (Zn) transport proteins, ZnT2, ZIP2 (ZRT and IRT-like proteins); and ZIP4, which enable Zn absorption in the small intestine of rats. We also investigated tissue Zn levels in the small intestine. We used four groups of adult male rats: group 1, control; group 2, pinealectomy (Px); group 3, Px + melatonin (MEL); group 4, MEL only. Animals in groups 3 and 4 were administered 5 mg/kg/day MEL for four weeks. At the end of the study, all animals were sacrificed and samples of duodenum, jejunum and ileum were harvested to analyze ZnT2, ZIP2, ZIP4 and MT levels using immunohistochemistry, and tissue Zn levels were measured by atomic absorption spectrophotometry. The lowest ZnT2 levels in the duodenum, jejunum and ileum, and the lowest ZIP2 levels in the duodenum and ileum were found in group 2. The lowest ZIP4 levels were found in the duodenum and jejunum, and the lowest MT levels in the duodenum and ileum were found in group 2. The highest MT values in the ileum were found in group 4. We found that ZnT2, ZIP2, ZIP4 and MT levels were reduced in the ileum compared to controls following Px, but levels approached control values after MEL administration. By its effects on ZnT2, ZIP2, ZIP4 and MT levels, MEL participates in the absorption of Zn in the rat small intestine.Öğe Effect of resveratrol administration on muscle glycogen levels in rats subjected to acute swimming exercise(C M B Assoc, 2019) Bicer, Mursel; Baltaci, Saltuk Bugra; Mogulkoc, Rasim; Baltaci, Abdulkerim Kasim; Avunduk, Mustafa CihatThe present study aims to examine how resveratrol administration affects muscle glycogen levels in rats subjected to an acute swimming exercise bout. The study was conducted on adult male rats of Wistar-Albino. The 28 rats used in the study were equally divided among four groups: Group 1, Control Group: The group fed on a standard diet and not subjected to any procedure. Group 2, Control Swimming Group: The group fed on a standard diet and subjected to an acute swimming exercise bout for 30 minutes at the end of the study. Group 3, Resveratrol Group: The group fed on a standard diet and given (10 mg/kg) resveratrol in drinking water for four weeks. Group 4, Resveratrol Swimming Group: The group fed on a standard diet, given (10 mg/kg) resveratrol in drinking water for four weeks and subjected to a 30-minute acute swimming exercise at the end of the study. At the end of the four weeks, the animals were decapitated, muscle glycogen levels using immunohistochemical method. The highest muscle glycogen levels were obtained in the resveratrol-administered Group 3 and the lowest levels in group 2 (swimming group) (p<0.05). The results of the study demonstrate that resveratrol support had a protective and/or regulatory effect on mucle glycogen in both exercised and not-exercised rats.Öğe Effect of resveratrol administration on muscle glycogen levels in rats subjected to acute swimming exercise(C M B Assoc, 2019) Bicer, Mursel; Baltaci, Saltuk Bugra; Mogulkoc, Rasim; Baltaci, Abdulkerim Kasim; Avunduk, Mustafa CihatThe present study aims to examine how resveratrol administration affects muscle glycogen levels in rats subjected to an acute swimming exercise bout. The study was conducted on adult male rats of Wistar-Albino. The 28 rats used in the study were equally divided among four groups: Group 1, Control Group: The group fed on a standard diet and not subjected to any procedure. Group 2, Control Swimming Group: The group fed on a standard diet and subjected to an acute swimming exercise bout for 30 minutes at the end of the study. Group 3, Resveratrol Group: The group fed on a standard diet and given (10 mg/kg) resveratrol in drinking water for four weeks. Group 4, Resveratrol Swimming Group: The group fed on a standard diet, given (10 mg/kg) resveratrol in drinking water for four weeks and subjected to a 30-minute acute swimming exercise at the end of the study. At the end of the four weeks, the animals were decapitated, muscle glycogen levels using immunohistochemical method. The highest muscle glycogen levels were obtained in the resveratrol-administered Group 3 and the lowest levels in group 2 (swimming group) (p<0.05). The results of the study demonstrate that resveratrol support had a protective and/or regulatory effect on mucle glycogen in both exercised and not-exercised rats.Öğe The effect of resveratrol supplementation on plasma leptin and liver glycogen levels in rats with acute swimming exercise(Wiley-Blackwell, 2015) Duran, Mursel Oguzhan; Baltaci, Abdulkerim Kasim; Mogulkoc, Rasim; Avunduk, Mustafa Cihat; Ergene, Neyhan[Abstract Not Availabe]Öğe Effect of Zinc and Melatonin on Oxidative Stress and Serum Inhibin-B Levels in a Rat Testicular Torsion-Detorsion Model(Springer/Plenum Publishers, 2017) Semercioz, Atilla; Baltaci, Abdulkerim Kasim; Mogulkoc, Rasim; Avunduk, Mustafa CihatThe present study was aimed to examine the effects of 3-week zinc and melatonin administration on testicular tissue injury and serum Inhibin-B levels caused by unilateral testicular torsion-detorsion in rats. The study was performed on 60 Wistar Albino-type adult male rats. The animals were allocated to 6 groups in equal numbers. 1. Control; 2. Sham; 3. Ischemia-reperfusion; 4. Zinc + ischemia-reperfusion; 5. Melatonin + ischemia-reperfusion; 6. Zinc + melatonin + ischemia-reperfusion. Zinc and melatonin were administered before ischemia-reperfusion at doses of 5 and 3 mg/kg respectively, by intraperitoneal route for a period of 3 weeks. Testicular torsion-detorsion procedures consisted of ischemia for 1 h and then reperfusion for another hour of the left testis. Blood and testicular tissue samples were collected to analyze erythrocyte and tissue GSH and plasma and tissue MDA, Inhibin-B levels. The highest erythrocyte and testis GSH values were found in zinc, melatonin, and zinc + melatonin groups (p < 0.001). Torsion-detorsion group has significantly lower erythrocyte GSH levels and higher plasma MDA values (p < 0.001). Serum inhibin-B and spermatogenic activity levels in the torsion-detorsion group were also significantly lower than those in the other groups (p < 0.001). However, zinc-, melatonin-, and melatonin + zinc-supplemented groups have higher inhibin-B and spermatogenetic activity (p < 0.001). The results of the study show that zinc, melatonin, and melatonin + zinc administration partially restores the increased oxidative stress, as well as the reduced inhibin-B and spermatogenic activity levels in testes ischemia-reperfusion in rats. Suppressed inhibin-B levels in the testicular tissue may be a marker of oxidative stress.Öğe Effect of zinc sulfate supplementation on metallothionein levels in rat heart tissue with induced ischemia-reperfusion injury(Biointerface Research Applied Chemistry, 2018) Yazgan, Betul; Baltaci, Abdulkerim Kasim; Mogulkoc, Rasim; Avunduk, Mustafa Cihat; Sahna, EnginMetallothioneins are remarkable proteins with regard to their role in the regulation of intracellular zinc balance and mediation of the physiological effects of zinc, as well as their antioxidant effects. The objective of the present study is to examine how zinc supplementation impacts metallothionein levels in ischemia-reperfusion injury in rats. The study involved heart tissues obtained from 30 Wistar-Albino adult male rats already used in another project. Experimental animals were equally divided into three groups as follows: Group 1: Control (H-Cont); Group 2: Heart Ischemia/Reperfusion (H-I/R); and Group 3: Zinc supplemented Ischemia/Reperfusion (H/Zn-I/R). Cardiac ischemia-reperfusion procedures were carried out under general anesthesia. In the zinc-supplemented cardiac I/R group (Group 3), the animals were supplemented with 5 mg/kg/day intraperitoneal (i.p.) zinc sulfate per rat for 21 days. At the end of the procedures, all animals were decapitated and heart tissues were collected. The tissues were subjected to immunohistochemical staining procedures using rat metallothionein antibody. The stained preparations were photographed and cells stained with metallothionein were counted at a light microscope to calculate their percentages. The analyzed heart tissue samples of the groups did not have any significant difference in terms of their metallothionein levels. Results obtained from the study indicate that 21-day zinc supplementation does not have a critical effect on metallothionein synthesis in cardiac ischemia-reperfusion. This result may be attributed to the dose of zinc, length of supplementation and/or duration of ischemia-reperfusion.Öğe The effects of led-mediated-photobiomodulation therapy on newly formed bone in distraction osteogenesis(Bayrakol Medical Publisher, 2020) Akcay, Huseyin; Etoz, Osman A.; Guray, Enis; Avunduk, Mustafa Cihat; Alkan, AlperAim: The purpose of this experimental study was to determine the effects of light emitting diode-mediated-photobiomodulation therapy (LPT) on newly formed bone in mandibular distraction osteogenesis (DO). Materials and Methods: Sixteen adult male New Zealand white rabbits were involved in the study. Osteotomy was done on left mandibular corpus under general anesthesia. Custom-made external distractors were positioned to left mandibles of animals. The latency period was 5 days, then distractors were activated twice a day for 7 days with 0,5mmx2/day frequency. Sixteen rabbits were randomly divided into experimental (n=8) and control (n=8) groups. Animals in the experimental group were exposed to LPT with an energy density of 20mW/cm2 for 21 consecutive days directly over the distraction area starting with the distraction period. DO was performed without further treatment in the control group. After 30 days of consolidation period, the animals were sacrificed and samples were harvested. Bone mineral density (BMD) and bone mineral content (BMC) of bone formed through DO were evaluated using dual-energy x-ray absorptiometry (DEXA) and bone samples were processed for histological investigation. The data were analyzed using the Student t-test and the Mann-Whitney U test (p=0.05).Results: Bone mineral density was higher in the distraction gap of the experimental group (p=0.013). The number of osteoblasts and new bone forming area were significantly greater in the experimental group than the control group (p<0.05). Discussion: The results showed that LPT had a positive effect on the biomodulation of newly formed bone in DO in a rabbit model. Photobiomodulating effects of LLLT and LPT on bone healing seem similar according to the literature and LPT may be a safe and useful alternative for accelerating the treatment process of DO.Öğe The Effects of Low Dose Zinc Supplementation on the Development of New Bone in Rabbits(Istanbul Training & Research Hospital, 2020) Calik, Mustafa; Calik, Saniye Goknil; Dagli, Mustafa; Avunduk, Mustafa CihatIntroduction: Zinc (Zn) is an essential element for the healthy bone metabolism. It promotes bone formation by stimulating the proliferation and differentiation of osteoblasts, and increases the stimulation of osteoblastic bone mineralisation. Also, it suppresses the differentiation of osteoclasts while inhibiting bone resorption. The purpose of this study is to investigate the effects of low-dose Zn supplementation on new bones grown in rabbits. Methods: We evaluated 40 male white rabbits aged six weeks from New Zealand in 8 groups, with each including 5 subjects. All the groups underwent subperichondrial costal cartilage resections from the third rib on the right hemithorax. Rabbits in first and second groups underwent the partial resection of two ribs, and rabbits in third and fourth groups underwent total rib resection. Rabbits in fifth and sixth groups underwent the partial resection of four ribs, whereas rabbits in seventh and eighth groups underwent total resection. Rabbits in Groups 2, 4, 6, and 8 were treated with 6 mg/kg/day intraperitoneal Zn for four weeks after the operation. All groups were followed up to the 24th week of their lives. Results: We detected a statistically significant difference for both osteoblasts and osteoclasts among all the subgroups. Additionally, we also detected a significant increase in bone consolidation by Zn supplementation. Our study found that Zn suppresses osteoblastic bone absorption by stimulating osteoblastic bone formation in the light of the literature. Conclusion: Low-dose Zn administration in rabbits has been found to expedite the rib consolidation. Zn can be used to increase the bone maturation such as at the site of new bone formation in rib fracture and after all kinds of operations related to bones.Öğe Effects of resveratrol and cigarette smoking on bone healing: Histomorphometric evaluation(2016) Kolkesen Şahin, Özge; Aksoy, Müge Çina; Avunduk, Mustafa CihatBackground/aim: The aim of the present study is to investigate the effects of cigarette smoke (CS) and simultaneous application of resveratrol on bone healing histomorphometrically and to evaluate the effects of resveratrol on negative effects of CS. Materials and methods: For 4 weeks, Sprague Dawley rats were exposed to cigarette smoke at the equivalent of 6 cigarettes per day. After this period, monocortical defects were created in femurs by a trephine bur on day 28. Starting from the day of defect creation to the 28th postoperative day, rats were given 20 mg/kg body weight resveratrol. Histomorphometric examination of the number of osteoblasts and osteoclasts, as well as new bone area, was conducted. Results: Investigations were carried out on 33 rats. Differences between osteoblast numbers in the control and CS groups were significant, and CS caused a reduction in the number of osteoblasts. Areas of new bone formation in the resveratrol and control groups were higher than in the smoking and smokingresveratrol groups. Conclusion: Smoking appeared to have adverse effects upon bone healing and resveratrol administration helped to reduce these effects.Öğe Effects of topical mitomycin-C on the tracheal epithelia of rabbits following tracheostomy(Tubitak Scientific & Technological Research Council Turkey, 2021) Calik, Saniye Goknil; Calik, Mustafa; Kasdogan, Zumrut Ela Arslan; Avunduk, Mustafa Cihat; Aribas, Olgun Kadir; Esme, HidirBackground/aim: We aimed to investigate the topical application of mitomycin-C (MMC) after the conventional tracheostomy in a rabbit model. Materials and methods: Twenty-four male New Zealand White rabbits were randomly divided among 3 equal groups (n: 8). Tracheostomies were performed on 16 subjects. Group 1 which served as a control for all tracheal measurements. After tracheostomy, we applied sterile saline (group 2) or MMC at 0.8 mg/mL (group 3) around the tracheotomy site for 5 min. At the 3rd week after surgery, all tracheas were subjected to morphometric and histopathological examinations, including tracheal lumen diameter (LD), number of capillary vessels (CV), subepithelial tissue thickness (SETT), fibroblasts, and inflammatory cells (IC). Results: There was a statistically significant difference between the two tracheostomy groups themselves and the control group for LD (p = 0.035), CV (p = 0.006), SETT, fibroblasts, and IC (p < 0.001). Histopathological analysis showed the decreased LD, CV, SETT, IC, and fibroblasts compared to MMC with tracheostomy groups. MMC was more effective than saline for LD, CV, SETT, IC, and fibroblasts. Conclusion: Wound healing modulation may prevent scar formation. Fibrosis decreased following tracheostomy in the group treated with MMC. Fibroblasts appear to be key cells mediating these effects.Öğe Effects of zinc supplementation on metallothionein levels in ischemic renal tissue(Taylor & Francis Ltd, 2020) Yazgan, Betul; Baltaci, Abdulkerim Kasim; Mogulkoc, Rasim; Avunduk, Mustafa CihatWe investigated how zinc (Zn) supplementation affects metallothionein levels in the cortex and medulla of ischemic renal tissue of rats. We used adult male rats divided into four groups: group 1, untreated control; group 2, sham-operated; group 3, ischemia-reperfusion; group 4, ischemia-reperfusion + 5 g/kg Zn. Renal tissue was analyzed using immunostaining of rat metallothionein. Cells stained with metallothionein were counted and their percentage was calculated. We found that the Zn supplemented ischemia and reperfusion group exhibited a greater percentage of cells stained strongly for metallothionein in the renal cortex than all other groups. In the renal medulla, percentages of weak staining for metallothionein in the control and ischemia and reperfusion groups were greater than those in the sham and Zn-supplemented ischemia/reperfusion groups. Our findings indicate that the main effect of Zn in the renal tissue occurs in the cortex, while metallothionein synthesis in the renal medulla is unaffected.Öğe High-Grade Basal Cell Adenocarcinoma Arising from the Parotid Gland: A Case Report and Review of the Literature(Galenos Yayincilik, 2017) Ulku, Cagatay Han; Oltulu, Pembe; Avunduk, Mustafa CihatBasal cell adenocarcinomas are exceptionally rare and were first included in the histopathological classification of salivary gland tumors by the World Health Organization in 1991. These tumors are generally described as a low-grade malignancy with rare regional or distant metastasis. However, 48 basal cell adenocarcinoma cases arising from the major salivary glands have been described as high-grade malignancy in the English literature. Surgical excision and possible postoperative radiotherapy is the treatment of choice. Close follow up is mandatory for early detection of possible local recurrence. A 66-year-old female with high-grade basal cell adenocarcinoma of the parotid gland was presented in this study. Total parotidectomy with protection of the facial nerve integrity and postoperative radiotherapy were performed. At the most recent follow-up examination, 24 months after the surgery, the patient had no complaints and there was no sign of disease recurrence.!
