Yazar "Okyay, Ayse Guler" seçeneğine göre listele
Listeleniyor 1 - 10 / 10
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Biomechanical effects of menopause in ovariectomized rats' femurs(Informa Healthcare, 2014) Okyay, Ayse Guler; Kavak, Servet; Turktas, Ugur; Alkis, Ismet; Guner, Savas; Aksakal, BunyaminObjective: To demonstrate the biomechanical changes in rat bones occurred by surgical menopause and to search for correlation between biomechanical test results and bone mineral density (BMD) measurements. Methods: Thirty female Wistar-albino rats aged 6 months and weighed 250-300 g were randomized into ovariectomy, sham and control groups. After 6 months, rats were sacrificed and right femurs were extracted. BMD measurements and three point bending biomechanical tests were made in femurs. Results: The difference among the mean BMD measurements of three groups were found to be statistically significant (Pr>F value <0.0001). Mean elastic module, maximum elongation and femoral diameters were also found to be statistically significantly different (Pr>F value <0.05). Ovariectomised and sham-operated groups were significantly different in terms of elastic modulus. Ultimate force did not differ among the groups significantly. The difference between ultimate strain and maximum elongation of the ovariectomy and sham operated group was statistically significant. Conclusions: Bone quality was deteriorated and fragility was increased in rats 6 months after surgical menopause. Sole BMD measurement might not be reliable in evaluation of osteoporosis and fracture risk. Biomechanical quality of bone is more important than its mineral content in determining fragility.Öğe Biomechanical Effects of Menopause in Ovariectomized Rats' Femurs (vol 30, pg 62, 2014)(Informa Healthcare, 2014) Okyay, Ayse Guler; Kavak, Servet; Turktas, Ugur; Alkis, Ismet; Guner, Savas; Aksakal, Bunyamin[Abstract Not Available]Öğe Can the ductus venosus doppler predict the hemoglobinopathies?(E-Century Publishing Corp, 2015) Karateke, Atilla; Silfeler, Dilek Benk; Gungoren, Arif; Kurt, Raziye Keskin; Okyay, Ayse Guler; Dokuyucu, Recep; Ulutas, TurkerObjective: The aim of our study was to investigate the ductus venosus doppler between 11-13+6 (weekday) in pregnant women with hemoglobinopaties and its relation with fetal outcomes. Material and methods: A total of 100 pregnant women with hemoglobinopathies and 100 healthy pregnant women were included in our study. Ultrasonography (USG) was performed to all pregnant women and the ductus venosus doppler (DVD) flows were evaluated. The results were statistically analyzed. Results: The mean hemoglobin level was significantly lower in hemoglobinopathy group (9.7 +/- 0.7) than control group (10.67 +/- 0.82) (P<0.001). There was a significant relationship between Vmax, Vmin, S/D and reverse 'a' wave in fetuses with hemoglobinopathies. Vmax, Vmin and S/D parameters were higher in the group of hemoglobinopathies (respectively mean value, 31.3 +/- 1.66, 8.90 +/- 0.81, 2.97 +/- 0.49). Reverse 'a' wave was detected especially in all fetuses with sickle cell anemia. There was no significantly relationship between the groups in terms of PI, RI and HR. In a logistic regression analyses, fetal hemoglobinopathy was independently associated with Vmin (beta = 1.07, P = 0.001), S/D (beta = 2.61, P = 0.001) and reverse 'a' wave (beta = 2.46, P = 0.004). Conclusion: Pregnant women with hemoglobinopathies had changed ductus venosus doppler values in compared to normal pregnant women. Maternal anemia may cause this doppler changes. Furthermore all fetuses with sickle cell anemia (n = 5) had abnormal ductus venosus doppler findings. Further studies are needed to investigate the relationship between abnormal ductus venosus doppler findings and fetuses diagnosed with sickle cell anemia.Öğe The Effect of Erythropoietin in Preventing Ischemia-Reperfusion Injury in Ovarian Tissue Transplantation(Sage Publications Inc, 2018) Kolusari, Ali; Okyay, Ayse Guler; Kockaya, Evrim ArzuCondensation Erythropoietin improved the survival of follicles in ovarian grafts most likely by reducing ischemic injury, by improving neoangiogenesis, and by its antioxidant effects. Objective: Ovarian tissue cryopreservation and transplantation are the only options accepted for prepubertal girls and women requiring immediate chemotherapy. Ischemia-reperfusion injury is the main obstacle for ovarian tissue transplantation. In the present study, we aimed to evaluate the effects of recombinant human erythropoietin (EPO) on tissue viability in autotransplanted rat ovaries. Study Design: Seventeen female rats were randomized into 3 groups as sham control group (n = 5), EPO-treated group (n = 6), and EPO-untreated group (n = 6). Both ovaries were excised and transplanted into a subcutaneous pouch formed at the anterior abdominal wall in the EPO-treated and untreated groups. In the EPO group, 5000 U/kg EPO was applied as local injection to the site that ovarian tissue was placed and the dose was repeated with the same route at the end of the fourth week. After 2 months, ovaries were removed and blood samples were obtained. Levels of estradiol (E-2), vascular endothelial growth factor (VEGF), VEGF-C, and lipid hydroperoxidase (LPO) and the activity of glutathione peroxidase (GPX), superoxide dismutase (SOD), and catalase (CAT) were measured both in blood and tissue samples. Histopathological and morphometric analyses were also performed on tissue samples. Results: Considering serum levels, mean CAT was significantly higher (P = .003) and mean SOD (P = .033), LPO (P = .050), VEGF (P = .001), and VEGF-C (P = .024) were significantly lower in the EPO-treated group than in the untreated group. Mean serum GPX levels were similar. Significantly higher levels of E-2 were determined in the EPO group than in the untreated group. Highest serum E-2 levels were found in the sham group (P = .001). Tissue levels of GPX (1.23) and CAT (53.17) were significantly higher in the EPO group (P = .002 and P = .001, respectively). However, tissue levels of SOD and LPO, VEGF, and VEGF-C levels were significantly lower in the EPO group than those in the untreated group (P = .033, P = .050, P = .002, and P = .003, respectively). In tissue examination, the highest values of x, y axis and epithelial height were in the sham group. Mean value of the EPO group was found statistically significantly higher than that of the untreated group (P .05). In terms of antral follicle count, ordering was found as sham > EPO-treated > EPO-untreated group. Follicle counts in the EPO group were significantly higher than those in the untreated group (P 0.05). Conclusion: Erythropoietin improved the survival of follicles in ovarian grafts most likely by reducing ischemic injury, by improving neoangiogenesis, and by its antioxidant effects.Öğe The effect of obesity on inflammatory markers in patients with PCOS: a BMI-matched case-control study(Springer Heidelberg, 2014) Kurt, Raziye Keskin; Okyay, Ayse Guler; Hakverdi, Ali Ulvi; Gungoren, Arif; Dolapcioglu, Kenan Serdar; Karateke, Atilla; Dogan, Mustafa OzcilPrevious studies have shown increased inflammatory activity in patients with polycystic ovary syndrome (PCOS); however, it remains uncertain whether this increased inflammatory activity is a consequence of the disorder itself or of the accompanying obesity. We therefore aimed to test the inflammatory marker levels in obese and lean patients with PCOS by using two separate control groups with matching body mass index (BMI). A total of 120 women in reproductive age with (n = 62) and without (n = 60) PCOS were recruited for the study. Patients with PCOS were divided into two groups as obese (n = 32) and lean (n = 30) PCOS groups according to BMI. Two BMI-matched control groups were created. Furthermore, high sensitive CRP protein (hsCRP), neutrophils, lymphocytes, white blood cell count (WBC) and neutrophil to lymphocyte ratio (NLR) were evaluated with complete blood count. The hsCRP (5.5 +/- A 0.8 vs. 3.1 +/- A 0.7, p < 0.001), neutrophil count (3.8 +/- A 0.4 vs. 2.9 +/- A 0.7, p < 0.001), leukocyte count (7.2 +/- A 1.8 vs. 5.6 +/- A 1.6, p < 0.001), and NLR (2.6 +/- A 1.4 vs. 1.5 +/- A 0.4, p < 0.001) were higher in patients with PCOS compared to the control group while lymphocyte count was lower (1.71 +/- A 0.65 vs. 1.98 +/- A 0.39, p = 0.008). Similarly, both obese and lean patients with PCOS had higher levels of hsCRP, neutrophils, leukocytes and NLR ratios compared to BMI-matched controls. The correlation analysis revealed a moderate correlation between NLR and hsCRP (r 0.459, p < 0.001), and between HOMA-IR (r 0.476 p < 0.001) and BMI (r 0.310, p 0.001). Our study results demonstrated that both lean and obese patients with PCOS have increased inflammatory markers compared to BMI-matched control groups indicating that the inflammation seen in PCOS might be related with the presence of the disorder rather than with obesity.Öğe Evaluation of vaginal agenesis treated with the modified McIndoe technique: A retrospective study(Galenos Yayincilik, 2016) Karapinar, Oya Soylu; Ozkan, Mustafa; Okyay, Ayse Guler; Sahin, Hanifi; Dolapcioglu, Kenan SerdarObjective: Retrospective analysis of cases that have undergone neovagina operation because of congenital vaginal agenesis was objected. Material and Methods: Seven cases applying with the complaints of primary amenorrhea or inability to have sexual intercourse were in the study. The cases were diagnosed with congenital vaginal agenesis and operated at Mustafa Kemal University Training and Research Hospital between 2011 and 2014. Vaginoplasty by the modified McIndoe method was performed in all cases. The main complaint, chromosomal analysis, duration of operation, preoperative and postoperative vaginal length, complications, postoperative treatment, and satisfaction from the sexual intercourse were all evaluated. Results: Average age of our patients was 28.14 +/- 8.61 (19-39) years. One patient was 46XX-45X0 mosaic Turner syndrome), 1 patient was 46XY (testicular feminization), and other 5 patients were 46XX. The average duration of operation was 2.7 +/- 0.56 (2-3.5 h). Postoperative infection was observed in 1 patient. In this infected patient, graft failure occurred and debridement was performed in reoperation. No early complications were seen in the others. Preoperative and postoperative average vaginal lengths were 1.85 +/- 0.62 (1-3 cm) and 8.71 +/- 1.11 (7-10 cm), respectively. Dyspareunia occurred in 2 cases that were not able to use dilatator regularly: 1 because of cancelation of marriage and the other because of postoperative infection; regular sexual life was achieved in remaining 5 (71%) cases. Conclusion: Although there is no consensus about the ideal method of making a functioning vagina among different specialties. The modified McIndoe technique is the most applied method by gynecologists and simple, minimally invasive and with low morbidity.Öğe Protective Effect of Colchicine on Ovarian Ischemia-Reperfusion Injury: An Experimental Study(Springer Heidelberg, 2015) Kurt, Raziye Keskin; Dogan, Ayse Citil; Dogan, Murat; Albayrak, Aynur; Kurt, Sefika Nur; Eren, Furkan; Okyay, Ayse GulerObjective: The aim of the present study is to investigate the efficiency of colchicine in the experimental rat ovarian torsion model in the light of histological and biochemical data. Study Design: A total of 35 Wistar albino female rats were randomly divided into 5 groups, group 1: (control-sham operated, n = 7); group 2: (torsion/detorsion, n = 7) 2 hours of ischemia and 2 hours of reperfusion; group 3: (torsion/detorsion, n = 7), 2 hours of ischemia and 5 days of reperfusion; group 4: (torsion/detorsion, n = 7) 2 hours of ischemia and 2 hours of reperfusion and a signal dose of oral 1 mL/kg colchicine; and group 5: (torsion/detorsion, n = 7), 2 hours of ischemia and 5 days of reperfusion and 5 days of oral 1 mg/kg colchicine. Histopathologic evaluation was performed by a scoring that assesses congestion, bleeding, edema, and cellular degeneration in the ovarian tissue. Catalase, tissue malondialdehyde (MDA), and protein carbonyl levels were calculated. Results: The histopathologic scores, MDA, and protein carbonyl levels in the control and colchicine groups were significantly lower than groups 2 and 3 (P < .001). Catalase activities were significantly higher in the control and colchicine groups than in groups 2 and 3 (P < .001). The results of the histopathologic parameters and biochemical markers showed that protective effects of colchicine treatment persisted up to 5 days. Conclusion: Our study results revealed that colchicine reduced ovarian ischemia-reperfusion injury in experimental rat ovarian torsion model. As the ovarian detorsion is the first choice of the treatment modality in the early phase, antioxidant and anti-inflammatory treatment modalities like colchicine might be used to reduce ovarian ischemia-reperfusion injury.Öğe Protective Effects of Colchicine in an Experimental Rat Endometriosis Model: Histopathological Evaluation and Assessment of TNF-? Levels(Sage Publications Inc, 2015) Kurt, Raziye Keskin; Pinar, Neslihan; Karateke, Atilla; Okyay, Ayse Guler; Silfeler, Dilek Benk; Albayrak, Aynur; Ozdemir, SeydaObjective: Endometriosis is an estrogen-dependent chronic inflammatory disease observed in reproductive period. The aim of the present study is to assess the efficacy of colchicine, widely used to treat many inflammatory diseases, in an experimental rat endometriosis model. Study Design: Experimental endometriosis was constituted with implantation of autogenous endometrial tissue. Rats were divided randomly into 2 groups as colchicine group (n = 8) and control group (n =8). Although oral 0.1 mg/kg colchicine was administered 4 weeks to the colchicine group, the same amount of saline solution was administered to the control group. Before and after 30 days of treatment period, peritoneal and tissue tumor necrosis factor (TNF-), the volumes and histopathological properties of the implants were evaluated. Results: Although the implant volume decreased significantly in the colchicine group (89.2 13.4 mm(3) to 35.2 +/- 4.5 mm(3), P < .05), the implant volume increased in the control group (85.1 +/- 14.2 mm3 to 110.3 +/- 10.5 mm(3), P < .05). When compared to the control group, the colchicine group had significantly lower histopathologic sores (1.4 +/- 0.2 vs 2.6 +/- 0.4, P < .001). Although peritoneal fluid TNF- levels were significantly decreased in the colchicine group (45.2 +/- 5.3 pg/mL vs 12.1 +/- 5.2 pg/mL, P < .001), the peritoneal fluid TNF- levels were significantly increased in the control group after the treatment (44.2 +/- 3.5 pg/mL vs 61.3 +/- 12.2 pg/mL; P < .001). Tissue TNF- levels were significantly lower in the colchicine group when compared to the control group (45.4 +/- 8.6 pg/mL vs 71.3 +/- 11.2 pg/mL; P < .001). Conclusion: Colchicine resulted in regression of endometrial implant volumes in experimental rat endometriosis model and decreased peritoneal and tissue TNF- levels.Öğe Saffron induces Apoptosis in Ovarian Cancer cell via MAPK and AKT/mTOR Pathways(Mattioli 1885, 2020) Okyay, Ayse Guler; Kaplan, Hafil Mabir; Asil, Hasan; Singirik, ErginStudy Objectives: Saffron and its main components have been shown to have anti-tumor and anticancer effects in animal studies and human cancer cell cultures. This study aimed to investigate the anti-cancer effects of saffron on human ovarian cancer cells. Methods: Powder of saffron was applied to the HO-8910 cell lines. Cell viability was determined. ELISA test is used to examine the activity of caspase-3 and expression of AIF, gadd153, grp78, caspase 3, bax, bcl-2, wee 1, which are apoptotic pathway's mediators. Active ERK (p-ERK), active INK (p-JNK) active AKT (p-AKT), and active mTOR (p-mTOR) were also analyzed by ELISA. Results: Saffron treatment reduced the viability of ovarian cancer cells. Saffron treatment increased activity of caspase 3 and expression of bax, wee 1, gadd153, grp78, and AIF and decreased bcl-2 which is anti-apoptotic protein. Saffron also decreased the activity of p-ERK, p-JNK, p-AKT, and p-mTOR in ovarian cancer cells. Conclusion: This study revealed that saffron has a beneficial effect on cancer treatment. Saffron may show a synergistic effect with various chemotherapeutics while directing the cancer cell to death. Crocetin, one of its active components, has shown a synergistic anti-cancer effect combined with cisplatin. Saffron induced apoptosis via ER stress, AKT/mTOR, and MAPK pathways in the ovarian cancer cell line.Öğe SPONTANEOUS PNEUMOTHORAX AND PNEUMOMEDIASTINUM IN PREGNANCY(Galenos Yayincilik, 2014) Karadas, Sevdegul; Okyay, Ayse Guler; Odabasi, Dolunay; Selvi, FatihSpontaneous acute pneumothorax may occur as a result of spontanous rupture of subpleural blebs or bullae and it is extremely rare during pregnancy. Spontaneous acute pneumothorax and pneumomediastinum were diagnosed in a young pregnant woman admitted with the complaints of swelling and pain on her neck and upper thorax following 2 days' dyspnea. Nasal oxygen, analgesics and antiemetics were used as needed during ten days' hospitalisation. Physical findings, chest X-ray and oxygen saturation improved at the end of this period. Since supportive treatment was sufficient, invasive treatments such as surgery or thorax tube were not required. Although rare, pneumothoax should be remembered in any pregnant woman with dyspnea and chest-pain and must be confirmed radiographically to distinguish it from other diseases and conditions. In this report, a case of spontaneous acute pneumothorax and pneumomediastinum in a 10 week primigravida is presented.
