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Now showing 1 - 10 of 15
  • PublicationOpen Access
    Assessment of serum endocan levels in patients with beta-thalassemia minor
    (2022-02-01T00:00:00Z) Zorlu, Mehmet; Ozer, Ömer Faruk; Karatoprak, Cumali; Kıskaç, Muharrem; Çakırca, Mustafa; ZORLU, MEHMET; ÖZER, ÖMER FARUK; KARATOPRAK, CUMALİ
    Objective: Beta-thalassemia minor is a blood disease caused by a hereditary decrease in beta-globin synthesis, frequently leading to hypochromic microcytic anemia. Formerly called endothelial cell-specific molecule 1, endocan is a proteoglycan released by vascular endothelial cells in many organs. Our aim was to investigate the relationship between the beta-thalassemia minor patients and the healthy control group in terms of serum endocan level. Methods: The study was performed in a total of 80 subjects. They were divided into two groups, the beta-thalassemia minor group (n=40) and the healthy control group (n=40). Serum endocan levels, age, sex, body mass index value, and tobacco use data of these groups were compared. Results: No statistically significant difference was detected between the two groups in terms of age, sex, and body mass index values (p>0.05). Endocan levels were measured to be 206.85±88.1 pg/mL in the beta-thalassemia minor group and 236.1±162.8 pg/mL in the control group with no significant difference between the groups in terms of serum endocan levels (p>0.05). Conclusions: In our study, there was no change in endocan level in beta-thalassemia minor. This might be because serum endocan levels are affected by multi-factorial reasons. Serum endocan levels may be altered secondarily to decreased beta-globin chain, increased sympathetic activity due to anemia, or platelet dysfunction induced by oxidative stress in beta-thalassemia minor. Further multicenter studies involving more patients are necessary to demonstrate this.
  • PublicationOpen Access
    Protective and therapeutic effects of pyrrolidine dithiocarbamate in a rat tongue cancer model created experimentally using 4-nitroquinoline 1-oxide.
    (2020-11-01T00:00:00Z) Doğan, R; Hafız, AM; Gucin, Z; Ozer, OF; Ozturan, O; Yenigun, Alper; DOĞAN, REMZI; GÜCİN, ZÜHAL; ÖZER, ÖMER FARUK; YENİGÜN, ALPER; ÖZTURAN, ORHAN
  • PublicationOpen Access
    Oxidative stress in maternal milk and cord blood in gestational diabetes mellitus: a prospective study.
    (2022-05-01T00:00:00Z) Erdoğan, Fırat; Şenkal, Evrim; Özer, Ömer Faruk; İpek, İlke Özahi; Altuntaş, Şükriye Leyla; Özde, Şükriye; ÖZER, ÖMER FARUK
    Background: Reduced antioxidant defenses may reflect a poor protective response against oxidative stress and this may be implicated in progression of gestational diabetes mellitus (GDM). Oxidative stress induced by hyperglycemia plays a major role in micro and macrovascular complications, which imply endothelial dysfunction. Objective: Our aim in this study was to investigate the association between GDM and oxidative stress markers measured in plasma, with regard to revealing changes to total antioxidant capacity (TAC) and total oxidant status (TOS) among mothers showing impairments in oral glucose tolerance tests (OGTTs). Design and setting: Prospective study at a university hospital in Turkey. Methods: The study group consisted of 50 mothers with GDM, and 59 healthy mothers served as controls. Umbilical cord blood samples were taken from all mothers during delivery and breast milk samples on the fifth day after delivery. TAC, TOS, thiol and disulfide levels were measured. Results: No statistically significant relationship between the blood and milk samples could be found. An analysis on correlations between TAC, TOS and certain parameters revealed that there were negative correlations between TOS and total thiol (r = -0.386; P < 0.001) and between TOS and disulfide (r = -0.388; P < 0.001) in milk in the control group. However, these findings were not observed in the study group. Conclusion: Our findings suggested that a compensatory mechanism of oxidative stress was expected to be present in gestational diabetes mellitus and that this might be ameliorated through good glycemic regulation and antioxidant supplementation.
  • PublicationOpen 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, ŞAHABETTİN
    Objective: 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.
  • PublicationOpen Access
    The Effect of Serum Bone Sialoprotein Levels on Tympanosclerosis
    (2020-07-01T00:00:00Z) Baki, Ahmet; Yildiz, Muhammet; ÖZER, Ömer Faruk; ÇAĞLAR, Hifa Gülru; ÖZER, ÖMER FARUK; ÇAĞLAR, HİFA GÜLRU
    Objective: This study aimed to investigate serum bone sialoprotein (BSP) levels in patients with tympanosclerosis (TS). Methods: We included into this study 24 patients with TS and 24 asymptomatic healthy volunteers. Our study consisted of two groups: TS group (n=24), comprising of patients who underwent surgery for chronic otitis media and had tympanosclerotic plaques; and a control group (n=24), comprising of healthy individuals without ear problems. The serum BSP levels were measured and the results were compared between the two groups. Results: In the TS group, there were 15 female and nine male patients. The ages of the females ranged from 24 to 54 years, while those of the males ranged from 34 to 55 years; the average age was 40.46 +/- 9.75 and 43.11 +/- 6.77, respectively. In the control group, there were 14 females and ten males. The ages of the females ranged from 30 to 48 years, while those of the males ranged from 27 to 47 years; the average age was 40.25 +/- 5.28 and 38.4 +/- 27.08, respectively. There was a statistically significant difference in BSP levels between the two groups (p=0.001). In addition, there was a moderate positive correlation between BSP and hearing levels. Conclusion: The serum BSP levels were higher in the TS group than in the control group and might have some effect on TS. Further studies on a large number of subjects using serum and tissue BSP levels should be designed to affirm the effects of BSP on TS.
  • PublicationOpen Access
    Paraoxonase-1 Phenotype and Its Relationship with Mean Platelet Volume and Oxidative Stress in Coronary Artery Disease
    Objective: 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.
  • PublicationOpen Access
    Dry Eye and Dry Nose Caused by the Effect of Allergic Rhinitis on Tear and Nasal Secretion Osmolarity.
    (2020-03-17T00:00:00Z) Elbay, A; Yenigun, A; Ozturan, O; Bayraktar, H; Ozer, Ömer Faruk; Dogan, R; YENİGÜN, ALPER; ELBAY, AHMET; ÖZDEM, ABDULLAH; ÖZER, ÖMER FARUK; DOĞAN, REMZI; ÖZTURAN, ORHAN
    Objective: Allergic rhinitis is a type 1 hypersensitivity reaction of immunoglobulin E in the rhino-ocular mucosa. This study was planned to demonstrate in patients with allergic rhinitis to evaluate changes in tear, nasal secretions, and blood osmolarity compared to healthy individuals. Method: Forty allergic rhinitis patients, 25 patients with acute upper respiratory tract infections, and 26 healthy participants were included in the study. Positive patients with allergic symptoms and skin prick test results were included in the allergic rhinitis group. Tear, nasal secretion, and blood osmolarity values were examined for the 3 groups. Result: In patients with allergic rhinitis, tear and nasal secretion osmolarity values were significantly higher in patients with acute upper respiratory tract infections and those of the healthy participants (P ¼ .001, P ¼ .038). In blood osmolarity measurements, there was no statistical difference between the groups (P ¼ .489). In patients with allergic rhinitis, Schirmer test results were significantly shorter than patients who had acute upper respiratory tract infection and those of the healthy participants (P ¼ .001, P ¼ .001). Patients with allergic rhinitis and acute upper respiratory tract infections had significantly shorter Schirmer test results than in healthy participants (P ¼ .001, P ¼ .001). Conclusion: Tear osmolarity was increased in allergic rhinitis patients, and this was thought to lead to dry eye findings. In the presence of allergic rhinitis, nasal secretions were found more hyperosmolar than tears. Nasal secretion osmolarity was higher in allergic rhinitis patients than in patients with acute upper respiratory tract infections and control group.
  • PublicationOpen Access
    Comparison of the biochemical and radiological criteria for lumbar disc degeneration
    (2018-09-01) Seyithanoglu, MEHMET HAKAN; Kitis, SERKAN; Ozer, Omer Faruk; Kocyigit, ABDÜRRAHİM; DÜNDAR, Tolga; Papaker, Meliha Gundeg; SEYİTHANOĞLU, MEHMET HAKAN; KİTİŞ, SERKAN; ÖZER, ÖMER FARUK; KOÇYİĞİT, ABDÜRRAHİM
    Background: The relationship between radiological degeneration criteria on lumbar magnetic resonance imaging (MRI) and both the keratan sulfate (KS) and chondroitin sulfate (ChS) levels was examined in disc material taken from patients undergoing lumbar disc herniation (LDH) surgery. To examine whether the biochemical and radiological degeneration criteria testing the reliability of radiological degeneration findings agreed and to evaluate the contribution of the KS/ChS ratio to disc form (protruding or extruding).
  • PublicationOpen Access
    An Evaluation of the Protective Effects of Thymoquinone on Amikacin-Induced Ototoxicity in Rats
    Objectives. In this study we investigated the probable protective effects of thymoquinone on amikacin-induced ototoxicity in rats. Methods. Thirty-two healthy rats were divided into four groups (amikacin, amikacin+thymoquinone, thymoquinone, and no treatment). Thymoquinone was fed to the rats via oral gavage in a dose of 40 mg/kg/day throughout the study period of 14 days. Amikacin was given by the intramuscular route in a dose of 600 mg/kg/day. Audiological assessment was conducted by the distortion product otoacoustic emission (DPOAE) and auditory brainstem response (ABR) tests, administered to all rats at the beginning of the study, and also on days 7 and 15. Biochemical parameters were calculated at the termination of the study to evaluate the oxidative status. Results. There were significant decreases in DPOAE values and significant increases in ABR thresholds of the amikacin group on days 7 and 15, as compared to the amikacin+thymoquinone group. While ABR thresholds of the amikacin group increased significantly on days 7 and 15 as compared to their initial values, there were no significant differences between the initial and the 7th and 15th day values of ABR thresholds in the amikacin+thymoquinone group. Total oxidant status and oxidative stress index values of the amikacin+thymoquinone group were significantly lower than those of the amikacin group. Total antioxidant status values of the amikacin+thymoquinone group were significantly higher than those of the amikacin group. Conclusion. Our study has demonstrated that the ototoxic effect brought forth by amikacin could be overcome with the concurrent use of thymoquinone.
  • PublicationOpen Access
    Oxidative Stress Status in Childhood Obesity: A Potential Risk Predictor
    (2016-10-13) Kılıç, Elif; Ozer, Omer Faruk; Erek, Aybala Toprak; ERMAN, HAYRİYE; Torun, EMEL; AYHAN, Siddika Kesgin; Caglar, HİFA GÜLRU; Selek, Sahbettin; Kocyigit, ABDÜRRAHİM; ÖZER, ÖMER FARUK; TORUN, EMEL; ÇAĞLAR, HİFA GÜLRU; SELEK, ŞAHABETTİN; KOÇYİĞİT, ABDÜRRAHİM
    Background: Childhood obesity characterized by excessive fat in the body is one of the most serious health problems worldwide due to the social, medical, and physiological complications. Obesity and associated diseases are triggering factors for oxidative stress and inflammation. The aim of this study was to explore the possible association between childhood obesity and inflammatory and oxidative status. Material/Methods: Thirty-seven obese children and 37 healthy controls selected from among children admitted to BLIND University Paediatrics Department were included in the study. Anthropometric measurements were performed using standard methods. Glucose, lipid parameters, CRP, insulin, total oxidant status (TOS), total anti-oxidant status (TAS) levels, and total thiol levels (TTL) were measured in serum. HOMA index (HOMA-IR) were calculated. The differences between the groups were evaluated statistically using the Mann-Whitney U test. Results: Body mass index was significantly higher in the obese group (median: 28.31(p<0.001). Glucose metabolism, insulin, and HOMA-IR levels were significantly higher in the obese group (both p<0.001). Total cholesterol, HDL cholesterol, LDL cholesterol, and triglyceride levels were significantly higher in the obese group (p<0.001). TAS (med: 2.5 µmol Trolox eq/L (1.7–3.3)) and TOS (med: 49.1 µmol H2 O2 eq/L (34.5–78.8)) levels and TTL (med: 0.22 mmol/L (0.16–0.26)) were significantly higher in the obese group (p=0.001). CRP levels showed positive correlation with TOS and negative correlation with TTL levels (p=0.005, r=0.473; p=0.01, r=–0.417; respectively). TTL levels exhibited negative correlation with TOS levels (p=0.03, r=–0.347). Conclusions: In conclusion, obese children were exposed to more oxidative burden than children with normal weight. Increased systemic oxidative stress induced by childhood obesity can cause development of obesity-related complications and diseases. Widely focussed studies are required on the use of oxidative parameters as early prognostic parameters in detection of obesity-related complications