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Öğe The detection of curcumins' antitumoral effects via argyrophilic nucleolar organizing region-associated protein synthesis in mice with ehrlich's ascitic carcinoma(Comenius Univ, 2017) Nisari, Mehtap; Yılmaz, Seher; Eröz, Recep; Ertekin, Tolga; Bircan, Duygu; Ülger, HarunBACKGROUND: Curcumin is a polyphenol compound that has antioxidant, anticancer, anti-inflammatory, anti-hyperlipidemic and antimicrobial effects. Nucleolar-organizing regions are the sites of the gene on chromosomes. The present study was aimed to show the antitumoral effect of curcumin via AgNOR protein synthesis in Ehrlich's ascitic carcinoma (EAC) bearing mice. METHODS: Twenty three mice with EAC were randomly divided into 3 groups as positive control (n = 7), group 2 (n = 8) and 3 (n = 8) treated intraperitoneally with curcumin (25 mg/kg) and (50 mg/kg), respectively. The animals were sacrificed on Day 16, the solid tumors were removed out. Then, total AgNOR area/nuclear area (TAA/NA) and the mean AgNOR number were estimated for each mice. RESULT: Statistically significant differences were determined among the whole groups for TAA/NA ratio (p = 0.000), conversely mean AgNOR number (p = 0.361). When comparingthe two groups; while no difference was determined between the control and curcumin (25 mg/kg) groups (p = 0.061), the significant differences were detected between the control and curcumin (50 mg/kg) groups (p = 0.000) and between curcumin (25 mg/kg) and curcumin (50 mg/kg) groups (p = 0.000) for TAA/NA ratio. However, there was no significant difference for the mean AgNOR number in double comparison of the groups. CONCLUSIONS: The current study showed that curcumin had a crucial function against cancer development. Also, both AgNOR values might be used as biomarkers for detection of the most reliable therapeutic dose selection of cancer treatment (Tab. 3, Fig. 2, Ref. 27). Text in PDF www.elis.sk.Öğe Ehrlich Solid Tümörlerinde Kanser Kök Hücre Varlığının İmmunohistokimyasal Olarak Değerlendirilmesi(2021) Ertekin, Tolga; Nisari, Mehtap; Özdamar, Saim; Önder, Gözde ÖzgeAmaç: Tümör gelişimi ve devamlılığında kanser hücrelerinin kendi başlarına hareket etmelerinin yanı sıra kanser kök hücrelerinin kanseri oluşturduğu, aynı zamanda kanserin relapsı ve metastazında rolleri olduğu düşünülmektedir. Çalışmamızda, meme kanseri kökenli olduğu bilinen ve verildiği farede tümör oluşturabilen Ehrlich asit tümörünün meme kanser kök hücre yüzey belirteçlerine sahip olup olmadığı ve niş oluşturup oluşturmadığı belirlenmesi amaçlanmıştır.Gereç ve Yöntemler: Çalışmada deneysel kanser modeli oluşturmak için EAT hücreleri 13 adet Balb/C farenin ense bölgesine subkutan olarak enjekte edilerek solid tümör gelişimi sağlandı. Deneyin 14. gününde anestezi altında tümör dokuları alındı. Dokulardan alınan kesitlere Hematoksilen&Eozin ve Masson’un üçlü boyaması uygulandı. Ayrıca dokular meme kanseri kök hücresi belirteçleri olan CD44 ve CD24 ekspresyonu ile birlikte niş belirteci olan periostin ekspresyonunu belirlemek için immunohistokimyasal olarak değerlendirildi.Bulgular: Deneklere eşit sayıda hücre verilmesine rağmen denekler arasında tümör boyutları, hacimleri ve denek ağırlıklarının farklı olduğu gözlendi. Dokularda CD44’ün ve CD24’ün hem hücre sitoplazmasında hem de hücre membranında, periostin’in ekstraselüler matriksde eksprese olduğu belirlendi. Sonuç: Hem sitoplazmik hem de membranda CD44 ekspresyonunun anormal olabileceği nedeniyle kanser kök hücresi varlığıyla ilgili bilgi elde etmemizi sınırlandırmıştır. Ayrıca hücrelerin CD24+ oluşu olgun kanser hücrelerinin tümör kitlesi içinde bulunduğunu göstermiştir. Bununla birlikte EAT, periostin ekspresyonunu artırmak yoluyla kendi nişini oluşturma yeteneğine sahip olduğunu göstermiştir.Öğe Investigation of Antitumor Activity of Fenugreek Paste Extracts(Düzce Üniversitesi, 2024) Alpa, Serife; Özçelik, Özlem; Yilmaz, Seher; Ertekin, Tolga; Nisari, Mehtap; Şeker Karatoprak, Gökçe; Ülger, HarunObjective: Fenugreek paste, which contains fenugreek and some spices, is a widely consumed food in Kayseri and the surrounding region of Turkey. In this study, the antitumor effect of an extract obtained from fenugreek paste was investigated in Balb/C mice bearing Ehrlich ascites tumor (EAT). Materials and Methods: The concentration of fenugreek paste extract in vivo was 200 and 400 mg/kg and in vitro was 250, 500 and 1000 µg/ml. At the end of the experiment, the volume of abdominal ascites fluid was measured and cells were counted.Results: Fenugreek paste extract delayed weight gain due to EAT cell proliferation in the treatment groups and caused a significant decrease in the number of cells in the ascites fluid in the 400 mg/kg fenugreek paste extract group (47.28 × 106) compared to the control group (67.60 × 106; p = 0.041). Histopathological analysis showed that EAT cells intensely adhered to tissues from the control group and adhered less in the treatment groups. The decrease was more significant in the 400-mg/kg fenugreek extract group. After 24-hour culture, there was a significant difference in EAT cells between the control group (5.9 ± 0.2) and the 250-, 500- and 1000-µg/ml fenugreek paste extract treatment groups (5.7 ± 0.2, 5.7 ± 0.2, and 5.6 ± 0.1, respectively; p = 0.013).Conclusion: The study results suggested that fenugreek paste extract had an antitumor effect on EAT cells.Öğe Investigation of argyrophilic nucleolar organizing region(Comenius Univ, 2016) Nisari, Mehtap; Eröz, Recep; Nisari, M.; Ertekin, Tolga; Oktay, Murat; Kavutçu, M.BACKGROUND: Ischemia/reperfusion (I/R) injury is a complex event frequently observed in vascular surgery and can cause functional and structural cell damage. Nucleolar-organizing regions (NORs) are sites of the ribosomal genes located on chromosomes and can be stained with silver when they are active. Thus these proteins are named as argyrophilic-NOR (AgNOR)-associated proteins. We aimed to investigate any possible effects of renal I/R injury on the NOR protein synthesis and association between the AgNOR proteins amount and histopathological injuring score. METHODS: Nine female wistar-albino rats with weight of 200-250g were included into the study. The animals were randomly divided in two groups, a Control Group and an I/R Group. In I/R group, rats were subjected to 45 minutes of renal pedicle occlusion followed by 24 hours of reperfusion. In the control group no drug injections or ischemia reperfusion were performed in animals. Then histopathological injury score, mean AgNOR number and total AgNOR area/nuclear area (TAA/NA) were detected for each rat. RESULTS: The differences between control and I/R groups were significant for histopathological injury scores (p = 0.016). Also the differences between control group and I/R group were significant for mean AgNOR number (p = 0.000) and TAA/NA ratio (p = 0.000). Additionally, there was a positive correlation between TAA/NA ratio and histopathological injury score (r = 0.728; p = 0.026) and between mean AgNOR number and histopathological injury score (r = 0.670; p = 0.048). CONCLUSION: The detection of AgNOR proteins amount may be used as an indicator to obtain information about the cellular behaviour (self-protective mechanism of tubular epithelial cells) against I/R injury and cellular damage levels (Tab. 2, Fig. 4, Ref. 24). Text in PDF www.elis.sk.Öğe May argyrophilic nucleolar organizing region-associated protein synthesis be used for selecting the most reliable dose of drugs such as rhamnetin in cancer treatments?(Comenius Univ, 2016) Ertekin, Tolga; Bozkurt, Özlem; Eröz, Recep; Nisari, Mehtap; Bircan, Duygu; Nisari, Mustafa; Unur, ErdoğanBACKGROUND: Rhamnetin is a flavonoid that has antioxidant, anti-inflammatory and anti-cancer effects. Nucleolar-organizing regions are the ribosomal genes region. We aimed to identify whether rhamnetin has an effect on cell proliferation and whether AgNOR proteins may be used for the detection of therapeutic benefits of the drugs and new metabolites, which have the potential of being used for cancer treatments. METHODS: Twenty-four mice with Ehrlich's ascites carcinoma (EAC) were randomly assigned to three main groups as positive control, and groups 2 and 3 treated intraperitoneally with rhamnetin (100 mu g/kg and 200 mu g/kg, respectively). All the animals were sacrificed on day 16, 24 h after the last dose; the tumors, which developed at the site of injection were removed. Then, mean AgNOR number and total AgNOR area/nuclear area (TAA/NA) were detected for each mouse. RESULTS: Significant differences were detected among all groups for mean AgNOR number (p = 0.000) and TAA/NA ratio (p = 0.000). While the difference between positive control and Rhamnetin (100 mu g/kg) group was not significant (p = 0.387), there are signifi cant differences between positive control and Rhamnetin (200 mu g/kg) group (p = 0.000) and between Rhamnetin (100 mu g/kg) and Rhamnetin (200 mu g/kg) groups (p = 0.000) for TAA/NA ratio. CONCLUSION: Rhamnetin has an important role in preventing cancer formation. Our study showed that mean AgNOR numbers and TAA/NA values may be used also as biomarkers for evaluating the success rate of the performed therapeutic strategy and accurate dose selection for the management of the disease (Tab. 3, Fig. 3, Ref. 45). Text in PDF www.elis.sk.
