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Öğe Androgen receptor status in lesional and normal skin of patients with rosacea(Blackwell Publishing Ltd, 2004) Erkek, E.; Bozdogan, O.; Kocak, M.; Birol, A.; Atasoy, P.…Öğe Examination of Bcl-2, Bcl-X and bax protein expression in psoriasis(Blackwell Publishing Ltd, 2003) Koçak, M.; Bozdogan, O.; Erkek, E.; Atasoy, P.; Birol, A.Background Psoriasis is an inflammatory skin disease characterized by epidermal hyperplasia and greatly accelerated epidermal turnover. The blockage of normal apoptotic process in the epidermis is one of the factors implicated in the pathogenesis of psoriasis. Objective The purpose of the present study was to elucidate whether bcl-family proteins are significantly involved in the hypothetical antiapoptotic cascade in lesional psoriatic epidermis. Methods Twenty-six lesional biopsy samples of 26 patients with psoriasis and five control specimens from normal skin were studied by immunohistochemical method for the differential expression of pro-apoptotic bax and antiapoptotic bcl-2 and bcl-x proteins. Results Compared with the normal epidermis, bcl-2 expression was significantly reduced, whereas bax and bcl-x were significantly overexpressed in the psoriatic epidermis. The localization of bcl-2/bax/bcl-x proteins in the psoriatic epidermis did not show a significant deviation from that in the normal epidermis. Conclusion These findings indicate a discordant expression of bcl-2 and bax/bcl-x in psoriatic epidermis. Increased bcl-x expression might contribute to the antiapoptotic response in psoriatic keratinocytes. The presence of strong bax expression with a concomitant decrease in bcl-2 expression suggests either a functional defect in bax protein or an inherent/acquired resistance to bax-mediated apoptosis in psoriatic keratinocytes.Öğe Fas-mediated pathway and apoptosis in normal, hyperplastic, and neoplastic endometrium(Academic Press Inc Elsevier Science, 2003) Atasoy, P.; Bozdogan, O.; Erekul, S.; Bozdogan, N.; Bayram, M.Introduction. Abnormalities in the control of cell proliferation and apoptosis have been suggested to contribute to the development and progression of neoplasia. There are at least two pathways that activate apoptosis. The first is a mitochondria-dependent route governed by bcl-2 family proteins. The second is a parallel mechanism which involves the activation of a group of tumor necrosis factor (TNF) receptors, such as Fas. Aims. The aim of this study was to examine the distribution and interrelation between the expression patterns of apoptosis-related proteins such as Fas, caspase-3 (CPP32), and M30, and to investigate the role of Fas-mediated apoptosis in the pathogenesis and progression of endometrial neoplasms. Materials and methods. Using specific antibodies for Fas, caspase-3, and M30, we examined protein expressions in 29 endometrial carcinomas, 30 endometrial hyperplasias, and 21 normal cyclic endometria. The results of immunostaining for Fas and caspase-3 were analyzed semiquantitatively by using an immunohistochemical scoring system (HSCORE) that incorporated both the intensity and the distribution of specific staining. For M30, positive staining cells and extracellular particles were analyzed semiquantitatively per 10 high-power fields. Results. HSCOREs of Fas and caspase-3 were slightly higher in the secretory endometria than in the proliferative endometria. Similarly, M30 reactivity seemed to increase in the late secretory phase of the cycle. HSCOREs of Fas and caspase-3 and the reactivity of M30 were significantly higher in the carcinoma group than in the simple hyperplasia group (P < 0.05). Complex hyperplasias, however, expressed quite similar HSCOREs of Fas and caspase-3 as carcinomas. M30 reactivity was also significantly higher in complex hyperplasias than in simple hyperplasias, and in carcinomas positivity increased significantly (P < 0.05) as the grade progressed. Conclusions. The significant increase observed in Fas, caspase-3, and M30 expression in carcinomas as compared with simple hyperplasias may suggest that the Fas-related apoptotic pathway is also involved in the regulation of apoptosis in the endometrial tissue and promotes the development and progression of endometrial neoplasia. (C) 2003 Elsevier Inc. All rights reserved.Öğe Polylactic acid and polyethylene glycol prevent surgical adhesions(Comenius Univ, 2016) Ozpolat, B.; Gunal, N.; Pekcan, Z.; Ayva, E. S.; Bozdogan, O.; Gunaydin, S.; Dural, K.OBJECTIVES: Re-mediastinoscopy could be risky because of adhesions from the previous mediastinoscopy. The aim of this study was to evaluate the efficacy of a bio-resorbable barrier on adhesion formation in a re-mediastinoscopy rat model. METHODS: Mediastinal dissection similar to mediastinoscopy was done in twenty-eight rats and a polymeric film comprising of polylactic acid and polyethylene glycol (Repel-cv (R), SyntheMed Inc., NJ, USA) was placed on trachea in the study groups. Group 1 (sham, sacrificed at day 30), Group 2 (single barrier, sacrificed at day 30), Group 3 (single barrier, sacrificed at day 60), Group 4(double layer barrier, sacrificed at day 60). Mediastinal adhesions, degree of inflammation, vascular proliferation, foreign body reaction and fibroblast proliferation was compared. RESULTS: Macroscopic dissection showed significantly dense adhesions in Sham Group and Group 3 (p < 0.05). Histopathologic examination showed that there was a significant difference between groups when the foreign body reaction and fibroblast proliferation was evaluated (p<0.05). No significant difference was present between the groups in terms of inflammation and vascular proliferation (p>0.05). CONCLUSIONS: This unique experimental study showed that adhesion barrier was effective as single layer application at day 30 and double layer application at day 60. At clinical conversion, by the application of barrier, the formation of adhesions might be decreased to provide a safe re-mediastinoscopy (Tab. 2, Fig. 4, Ref. 23). Text in PDF www.elis.sk.Öğe The role of macrophages in the pathogenesis of mycosis fungoides(Wiley, 2017) Kara, D. O.; Ozsarac, K. C.; Uzar, M. K.; Bozdogan, O.; Gunduz, O.BackgroundMacrophages are classified into classically activated (M1) and alternatively activated (M2) macrophages. Decrease in macrophage number in tumour tissue with treatment has been reported. AimThe aim of this study was to determine whether treatment has an effect on the number of dermal M1 and M2 macrophages in patients with mycosis fungoides (MF). MethodsIn total, 21 patients (8 women, 13 men; age range 42-73 years) were included in this study. We determined markers for dermal M1 (inducible nitric oxide synthase and CD68) and M2 (markers: CD163 and CD206) macrophages using double immunohistochemistry to reduce the error rate, and then counted the cells. ResultsThe number of dermal M1 cells was significantly lower pretreatment compared with post-treatment (P < 0.01). The numbers of dermal M2 cells were also numerically decreased by treatment. These results did not change significantly after exclusion of the patients who had recurrence (n = 2). There were no statistically significant differences between groups classified by stage, lesion type or treatment outcome. ConclusionMacrophage numbers are decreased in MF after treatment of tumour tissue.Öğe Tularemia presenting as tonsillopharyngitis and cervical lymphadenitis: a case report and review of the literature(Springer-Verlag, 2003) Arikan, O.K.; Koç, C.; Bozdogan, O.In this report, we describe a 57-year-old woman with oropharyngeal tularemia who presented with tonsillopharyngitis and cervical lymphadenitis. Clinical and radiological manifestations and histopathological characteristics of this disease are discussed with a review of the world literature. The oropharyngeal form of tularemia should be considered in the differential diagnosis of cases involving tonsillopharyngitis and cervical lymphadenitis, particularly in those not responding to penicillin treatment.
