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Öğe Arginase and Ornithine in Human Benign and Malignant Skin Tumors(Walter De Gruyter Gmbh, 2010) Gokmen, Selma Suer; Kazezoglu, Cemal; Aygit, A. Cemal; Yildiz, Reyhan; Cakir, Beyhan; Ture, Mevlut; Gulen, SendoganObjectives: Arginase activity and ornithine concentration have been shown to be elevated in experimentally-induced benign tumors in mice. The aim of the study is to investigate arginase activity and ornithine concentration in human benign and malignant skin tumors and to evaluate their role for prognosis of skin tumors. Patients and Methods: We have investigated arginase activity and ornithine concentration in supernatant of homogenates of benign tumors (nevus) of the skin from 13 patients and of malignant tumors (squamous cell or basal cell carcinomas) from 29 patients. Total arginase activity, ornithine and total protein concentration in supernatant were determined by the methods of Geyer, Chinard and Lowry, respectively. Results: Arginase activity (p=0.006) and ornithine concentration (p=0.007) in nevus were significantly higher than in adjacent normal tissue. There was no significant difference between their levels in basal cell carcinoma and in nevus (p>0.05). There was no significant difference between ornithine concentration in squamous cell carcinoma and in nevus (p>0.05). However, arginase activity in this carcinoma was significantly higher than in nevus (p=0.018). Conclusion: The significant difference between tissue arginase activities in squamous cell carcinoma and in nevus indicates that determination of arginase activity could be useful for prognosis of skin tumors.Öğe The Effects of Thermal Injury on Immature Rat Ear Cartilage(Lippincott Williams & Wilkins, 2010) Aygit, A. Cemal; Benlier, Erol; Top, Husamettin; Yalcin, Omer; Huseyinova, Gulara; Kanter, Mehmet; Cakir, BeyhanThe purpose of this study was to research regeneration and growing properties of an immature rat ear cartilage and its adjacent tissue after a thermal injury. Fifteen 30-day-old male Sprague-Dawley rats were used. Burn wounds were created by applying a heated plaque. All the rats, based on their tissue sampling day, were placed in two groups for histopathologic evaluation. In group I (n = 5), the burned right auricles were amputated on the first day, and the left auricles were amputated as a control at the same time. In group II (n = 10), the burned right auricles were amputated on the 30th day, and the left auricles were amputated as a control at the same time. Epithelization of skin was completed in period ranging between 12 and 15 days in all burned ears. The skin appendages were few throughout the affected area. Chondroid tissue regenerated from perichondrium and increased capillary vessels were observed. On the first day of the burn injury, electron microscopic findings were karyopyknosis, karyorrhexis, and karyolysis of the nucleus, and there were also signs of necrosis. New chondro-blasts were formed around the collagen fibrils in the scar tissue on the 30th day. CD-31 immunohistochemical staining showed increased capillary vessels in the burned ear. The peripheral nerve fibers decreased and regenerative signs of nerves were shown with the use of S-100 immunohistochemical staining. Differentiation of chondroblasts to chondrocytes occurs in the burned immature ear, and new cartilage tissue regenerates from perichondrium. In addition, regenerative signs of nerves appear. (J Burn Care Res 2010; 31: 803-808)Öğe Retro-Orbital Intraconal Fat Injection: An Experimental Study in Rabbits(W B Saunders Co-Elsevier Inc, 2012) Cakir, Beyhan; Aygit, Ahmet Cemal; Omur-Okten, Ozerk; Yalcin, OmerPurpose: Despite adequate treatment, enophthalmos due to intraconjunctival corticosteroid injection and enlargement of the bony orbit after trauma remains a frequent complication. The use of alloplastic material in addressing this problem is restricted because it may result in allergic reactions and is not cost-effective. The use of retro-orbital intraconal injection is the most effective method for maximum augmentation. An inexpensive and minimally invasive alternative that also allows for reoperation when needed would be a preferred intervention. Materials and Methods: We used 24 white rabbits (New Zealand) in our study. The animals were divided into 2 groups: a fat group and a saline solution group. The first group was subjected to retrobulbar fat injection, and the second group underwent physiologic saline solution injection. The volume of the retrobulbar area was measured and statistically evaluated both before and after the injections. Sonographically measured retrobulbar volumes were then statistically analyzed. Results: When the saline solution and fat groups were compared, no significant difference was observed between the preinjection volumes of the orbits. However, after injection, there was a significant difference between volumes. A statistically significant difference was shown between retroorbital volumes calculated before the injection in the fat group and volumes calculated immediately after injection and in the following 4 months (right retro-orbital volume of 1.291 cm(3) +/- 0.031 cm(3) before injection and 2.656 cm(3) +/- 0.040 cm(3) in the fourth month, P < .05). Conclusions: Volume augmentation by fat injection is superior to complicated surgical methods because of the advantages of decreased morbidity, rapid rehabilitation, and ease of reinjection. Using fat tissue as a filling material is more reliable, easier, and cheaper in comparison to other implantable materials. (C) 2012 American Association of Oral and Maxillofacial Surgeons J Oral Maxillofac Surg 70:242-250,2012Öğe Serum total and lipid bound sialic acid levels in patients with benign and nonmelanom malignant skin tumors(Walter De Gruyter Gmbh, 2007) Kazezoglu, Cemal; Goekmen, Selma Sueer; Sunar, Bendigar; Aygit, Cemal; Cakir, BeyhanIt has been reported that sialic acid containing oligosaccharides play an important role in the adhesion between cancer cells and endothelial cells and metastatic potential of tumor cells is proportional to cell surface sialylation. In the present study, we investigated whether there is a change in serum total and lipid bound sialic acid levels of patients with benign and non-melanom malignant skin tumors and, evaluated whether the measurement of sialic acid levels may be useful clinically in distinguishing patients with benign skin tumors from those with non-melanom malignant skin tumors. In this study, 27 patients with malignant skin tumors ( 16 men, age 50.78 +/- 12.46 years), 39 patients with benign skin tumors ( 17 men, age 48.59 +/- 16.23 years) were included. Serum total and lipid bound sialic acid determination was performed by the thiobarbituric acid method described by Warren and, the resorsinol method described by Katopodis, respectively. Student's T test and Z test were used to analyze the results. The mean serum total and lipid bound sialic acid levels were found to be 63.01 +/- 11.89 mg/dl and 15.77 +/- 2.44 mg/dl, respectively in patients with benign skin tumors; and 65.95 +/- 7.30 mg/dl and 16.70 +/- 3.80 mg/dl, respectively in patients with non-melanom malignant skin tumors. Serum total sialic acid and lipid bound sialic acid of patients with benign skin tumors were not different from those of patients with non-melanom malignant skin tumors. The percentage of lipid bound sialic acid was found to be 25.3 in patients with non-melanom malignant skin tumors, 25 in patients with benign skin tumors. There was no significant difference between the value of lipid bound sialic acid percentage in these groups. Our finding that there is no significant difference between serum total and lipid-bound sialic acid levels of patients with non melanom malignant skin tumors which are not able to metastase and patients with benign skin tumors supports the studies reporting that sialic acids play an important role in metastases.
