Person: ÖZER, ÖMER FARUK
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Publication Metadata only Farelede Radyoterapinin Etkileri(2015-04-27T00:00:00Z) TAŞPINAR, ÖZGÜR; AYDIN, TEOMAN; KILIÇ, GÖKHAN; EREN, FATMA; KIZILTAN, HURİYE; KEPEKÇİ, MÜGE; ERİŞ, HİKMET; KESKİN, YAŞAR; ÖZER, ÖMER FARUK; SELEK, ŞAHBETTİN; SEYİTHANOĞLU, MEHMET HAKAN; AYDIN, TEOMAN; KILIC, GÖKHAN; KESKİN, YAŞAR; ÖZER, ÖMER FARUK; SELEK, ŞAHABETTİNPublication Open Access Could Vitamin K1 Deficiency be the Problem in Iron Deficiency and/or Anemia in Premenopausal Women?(2022-04-01T00:00:00Z) Karatoprak, Cumali; Şekerci, Abdusselam; Karaaslan, Tahsin; Olgaç, Atilla; Özer, Ömer Faruk; Selek, Şahabettin; Köktaşoğlu, Fatmanur; Ekinci, İskender; KARATOPRAK, CUMALİ; ŞEKERCİ, ABDÜSSELAM; ÖZER, ÖMER FARUK; SELEK, ŞAHABETTİNObjective: The etiology of iron deficiency anemia, which develops as a result of menstrual bleeding in the premenopausal period, is unknown. Vitamin K1 has an important role in the coagulation cascade and is not a well known vitamin. The aim of this study was to investigate whether or not Vitamin K1 had a role in anemia developing in the premenopausal period, for which no additional reason could be found. Methods: This study included a patient group of women aged 18-50 years, who had a regular menstrual cycle. Patients who were found to have iron deficiency, who were evaluated hematologically, gastrointestinally and gynecologically, and who did not have a pathology that would lead to iron deficiency were included in the study group.The control group comprised volunteers with regular menstrual cycles who had not been previously determined with iron deficiency. In the study, Vitamin K1, Hemogram, ferritin, iron, total iron binding capacity were examined. The Vitamin K1 level was measured by two different methods both using ELISA and liquid chromatography-mass spectrometry (LC-MS/MS) methods. In addition, a record was made for all participants including demographic characteristics, lifestyle habits, and number of menstruating days. The obtained data were then compared between the groups. Results: A total of 88 voluntary participants were included in the study as 45 patients with iron deficiency anemia (IDA) and a control group of 43 subjects. The age, body mass index, partial thromboplastin, International normalized ratio, active partial thromboplastin time, folic acid, and Vitamin B12 values were similar in both groups. In both methods, no significant difference was determined between the groups in respect of the Vitamin K1 level (p=0.9 in ELISA method and p=0.3 in LC-MS/MS method). The number of menstruation days was determined to be significantly higher in the anemic group than in the control group (p=0.002). Conclusion: From the results of this study, it was considered that IDA developed in premenopausal women with a longer period of menstrual bleeding. However, Vitamin K1 deficiency was not considered to be one of the underlying reasons for longer menstrual bleeding.Publication Metadata only Investigation of Oxidative Stress Markers in the Pathogenesis of the Lung, Breast and Colon Cancer(2017-09-23T00:00:00Z) ÖZER, ÖMER FARUK; GÜLER, ERAY METİN; KOÇYİĞİT, ABDÜRRAHİM; SELEK, ŞAHBETTİN; ÇOBAN, GANİME; TÜRK, HACI MEHMET; ÖZER, ÖMER FARUK; GÜLER, ERAY METİN; KOÇYİĞİT, ABDÜRRAHİM; SELEK, ŞAHABETTİN; ÇOBAN, GANİME; TÜRK, HACI MEHMETPublication Open Access Paraoxonase-1 Phenotype and Its Relationship with Mean Platelet Volume and Oxidative Stress in Coronary Artery Disease(2015-09-01) SELEK, ŞAHBETTİN ; ÖZER, ÖMER FARUK ; GOKTEKİN, Omer ; KOÇYİĞİT, ABDÜRRAHİM; KALINBACOGLU, Ceren; ISLEK, Irem ; ISLEK, Tuğba; ARPACI, Beyza; Erol, Neval; MEYDAN, Sedat; GÜLER, ERAY METİN; SELEK, ŞAHABETTİN; ÖZER, ÖMER FARUK; KOÇYİĞİT, ABDÜRRAHİM; MEYDAN, SEDAT; GÜLER, ERAY METİNObjective: Paraoxonase-1 (PON1) 192 QR polymorphism is believed to be an important protective factor for coronary artery disease (CAD); oxidative stress plays a key role in the development of atherosclerotic CAD. Mean platelet volume (MPV) is also central to the processes, including pathophysiology of CAD and endothelial dysfunction. Thus, we aimed to determine the PON1 phenotype, MPV, and oxidative stress parameters in patients with angiographically proven CAD and to compare them with those in healthy subjects. Methods: Fifty-five CAD patients were diagnosed according to the angiography results, and 37 healthy subjects were present in this study. Serum paraoxonase and arylesterase activities were spectrophotometrically measured. Phenotype distribution was evaluated by the salt-stimulated paraoxonase activity according to arylesterase activity. Oxidative stress markers were evaluated by measuring serum total oxidant status (TOS) and total antioxidant status (TAS) as well as oxidative stress index. Results: In this study, the ratio of salt-stimulated paraoxonase/ OSI levels (S-PON1/OSI) were lower in the CAD patients and the differences were statistically significant (p<0.05). Therefore, the ratio of salt-stimulated paraoxonase/MPV (S -PON1/MPV) and S- PON1/OSI level were significantly different in the CAD patients as compared with controls group (p<0.01). Conclusion: Our study has suggested that S-PON1/OSI and SPON1/ MPV may play a significant role in CAD. To the best of our knowledge, the present study is the first to study the relationship among PON1 phenotype, MPV, and OSI in CAD patients. Thus, lowering of the oxidative stress and the regulation of MPV strategies may be a promising approach for the treatment of CAD.Publication Metadata only Raftlin, presepsin levels and thiol-disulfide homeostasis in acute appendicitis: A pilot study(2018-11-01) KOÇYİĞİT, ABDÜRRAHİM; ERSOY, YELİZ EMİNE; SELEK, ŞAHBETTİN; SÜMBÜL, BİLGE; ÖZER, ÖMER FARUK; GÜLER, ERAY METİN; MERAL, İSMAİL; YİĞİT, MEHMET; ÖZER, ÖMER FARUK; GÜLER, ERAY METİN; KOÇYİĞİT, ABDÜRRAHİM; MERAL, İSMAİL; SÜMBÜL, BİLGE; SELEK, ŞAHABETTİN; ERSOY, YELIZ EMINEObjective: To investigate some of the new inflammatory and oxidative stress markers in acute appendicitis.Publication Metadata only THIOL/DISULPHIDE HOMEOSTASIS AND OXIDATIVE STRESS PARAMETERS IN CHILDREN AND ADOLESCENTS WITH ATTENTION DEFICIT/ HYPERACTIVITY DISORDER(2016-09-01) ÖRENGÜL, ABDURRAHMAN CAHİD; SELEK, ŞAHBETTİN; Özer, ÖMER FARUK; GÖRMEZ, VAHDETTİN; UZUNER, SELÇUK; ÖZER, ÖMER FARUK; SELEK, ŞAHABETTİNPublication Metadata only ASSESSMENT OF PARAOXONASE AND ARYLESTERASE ANTIOXIDATIVE PARAMETERS IN RHEUMATIC DISEASES(2016-01-01) Keskin, YAŞAR; Aydin, TEOMAN; TAŞPINAR, ÖZGÜR; KEPEKÇİ, MÜGE; Ozer, O. F.; Selek, S.; Camli, AHMET ADİL; Mutluer, A. S.; KESKİN, YAŞAR; AYDIN, TEOMAN; ÖZER, ÖMER FARUK; SELEK, ŞAHABETTİN; ÇAMLI, AHMET ADİLThe aim of this study is to evaluate the patient stress markers which has the early stage rheumatoid arthritis (RA). Blood samples were collected from the patients diagnosed with rheumatoid arthritis according to American Rheumatism Association ACR 2010 criteria, but not employed the medication of DMARD (Disease-modifying antirheumatic drugs) in order to examine the stress parameters of total oxidant status, total antioxidant status, paraoxonase, paraoxonase NaCl, arylesterase concentration. Twenty nine patients diagnosed with early stage RA and 61 healthy control group included in the study. Peripheral blood samples were examined for all the assays. The average age of the patients was 39.91 +/- 13.32 and their average BMI was 28.56 +/- 4.15. ESR and CRP values have been found significantly high levels in RA group when we compare with control group. OSI values, which means oxidant parameters, have been found significantly high compared to the control group. When the parameters of arylesterase were compared to the control group, the values of control group were significantly high.Publication Metadata only Oxidative stress and phenotype frequencies of paraoxonase-1 in teratozoospermia.(2019-04-22) AKBULUT, H; Ozer, OF; GULER, ERAY METİN; CAGLAR, HİFA GÜLRU; GEVHER, FATİH; KOKTASOGLU, FATMANUR; SELEK, S; ÖZER, ÖMER FARUK; AKBULUT, HABİB; GÜLER, ERAY METİN; ÇAĞLAR, HİFA GÜLRU; GEVHER, FATİH; KÖKTAŞOĞLU, FATMANUR; SELEK, ŞAHABETTİNOxidative stress causes infertility in men by affecting especially sperm morphology. The aim of the study was to examine the frequencies of paraoxonase-1 (PON1) phenotypes and the serum PON1, arylesterase, total antioxidant status (TAS), total oxidant status (TOS), oxidative stress index, catalase and thiol levels in teratozoospermic infertile men and normospermic fertile men. The study included 184 teratozoospermic infertile men and 72 normospermic fertile men. The double substrate method was employed to determine the phenotype distribution of PON1. The evaluation of sperm morphology was made in accordance with the Kruger-s criteria. TAS, catalase and thiol levels were determined to be significantly lower in teratozoospermic infertile men compared to normospermic fertile men. A significant change was not observed in the levels of TOS, PON1 and arylesterase. There was a positive correlation between catalase and thiol levels and sperm morphology. While there were significantly more teratozoospermic men with AA phenotypes compared to normospermic men, there were significantly more persons with AB and BB phenotypes in normospermic men than in teratozoospermic men. As far as we know, such a study was conducted for the first time and suggests that PON1 phenotypic distribution may play a significant role in sterile males because of impaired sperm morphology.Publication Metadata only RELATIONSHIP BETWEEN RHEUMATOID ARTHRITIS DISEASE ACTIVITY AND MYELOPEROXIDASE AND CATALASE ACTIVITIES AND THIOL LEVELS(2016-01-01) Camli, AHMET ADİL; TAŞPINAR, ÖZGÜR; Aydin, TEOMAN; KEPEKÇİ, MÜGE; Ozer, O. F.; Keskin, YAŞAR; Selek, S.; Mutluer, A. S.; ÇAMLI, AHMET ADİL; AYDIN, TEOMAN; ÖZER, ÖMER FARUK; SELEK, ŞAHABETTİNThe aim of this study is to evaluate myeloperoxidase activity, catalase activity and thiol levels at early with rheumatoid arthritis patients. Blood taken from the patients was diagnosed with RA according to American Rheumatism Association ACR 2010 criteria, but not employed the medication of DMARD (Disease-modifying antirheumatic drugs) in order to examine the antioxidant parameters of myeloperoxidase activity, catalase activity and thiol levels. Twenty nine patients with early RA and 61 healthy controls were included in the study. Peripheral blood samples were used for all the assays. The average age of the patients was 39.91 +/- 13.32 and their average BMI was 28.56 +/- 4.15. Erytrocyte sedimentation rate (ESR) and C-reactive protein (CRP) values have been found significantly high levels in RA group when we compare with control group. Catalase activity and thiol levels which means antioxidant parameters, have been found significantly low levels according to control group. When the parameters of myeloperoxidase activity were compared to the control group, the values of control group were significantly high. Stronger response in patients with early RA suggests that antioxidant markers may be useful in evaluating the progression of RA as well as in elucidating the mechanisms of disease pathogenesis.Publication Metadata only Effects of beta-glucan on protection of young and aged rats from renal ischemia and reperfusion injury(2016-01-01) ESREFOGLU, MUKADDES; Tok, OLGU ENİS; AYDIN, M. S.; OZER, O. F.; SELEK, S.; Iraz, M.; EŞREFOĞLU, MUKADDES; TOK, OLGU ENİS; ÖZER, ÖMER FARUK; SELEK, ŞAHABETTİNBACKGROUND: Ischemia reperfusion injury is one of the leading causes of acute renal failure which is a common clinical event leading to development of chronic kidney disease and a high mortality; especially in elderly people. beta-glucans are glucose polymer groups with free-radical scavenger, macrophage activator, and immune defense inducer functions. We designed this study to determine the possible protective effects of beta-glucan against renal ischemia reperfusion injury comparatively in young and aged rats.