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Öğe Antileukemic effects of piperlongumine and alpha lipoic acid combination on Jurkat, MEC1 and NB4 cells in vitro(Medknow Publications & Media Pvt Ltd, 2016) Alpay, Merve; Dikmen, Begüm Yurdakök; Kısmalı, Görkem; Sel, TevhideAim of Study: This research indicated to evaluate the effects of piperlongumine (PL), a biologically active alkaloid, and alpha lipoic acid (ALA), a naturally occurring cofactor existed in multienzyme complexes regulating metabolism on leukemia cells. Excessive production of reactive oxygen species (ROS) can lead to oxidative stress, a state that has been observed in several hematopoietic malignancies, including acute and chronic myeloid leukemias. The importance of the association between oxidative stress and malignancy is not currently clear; however, there is evidence that tumor.derived ROS may promote cell survival, migration and metastasis, proliferation and even drug.resistance depending on the origin of the cancer. Increased oxidative stress in leukemic cells may represent a potential therapeutic target, although there are differing opinions on whether therapeutic strategies should aim to antagonize or further promote oxidative stress in leukemic cells. Materials and Methods: The effects of PL alone (5, 15, 30 M) and in combination (30 M) with ALA (200 M) on Jurkat, NB4 and MEC1 leukemia cell lines were investigated through MTT, caspase-3 and cyclooxygenase-2 (COX-2) activities. Results: Inhibition of COX-2 and the induction of caspase.3 cleavage in Nb4 (acute promyelocytic leukemia) cells were found to be significant following PL application and synergistic effects with combination of ALA (inhibition of COX-2 as 23.74% and 3.55-fold increase of caspase-3). Conclusion: PL and ALA may have a potential value as a therapeutic agent for patients with acute promyelocytic leukemia.Öğe Antioxidant therapy impresses in oxidative stress-induced kidney cells(Comenius Univ, 2017) Alpay, Merve; Kısmalı, Görkem; Meral, Öğünç; Sel, Tevhide; Özmerdivenli, Recep; Pasin, ÖzgeINTRODUCTION: Renal cell cancer (RCC) is not a single entity, but consists of different types of tumors derived from various parts of the nephron (epithelium or renal tubules). It is known that cancer initiation and progression is related to the balance between oxidants and antioxidants directly. Interestingly, advanced stages of cancer such as metastasis, angiogenesis are associated with cell oxidative capacity. Familiar antioxidative substances such as carotenes and vitamin C inhibit oxidation of other molecules during carcinogenesis. They can define the distinction between cancer and normal cells, destroying cancer cells while stabilizing healthy cells. METHODS: apoptotic activities of kidney cells were measured with caspase Elisa kits. DNA laddering test was used to show DNA damage in H2O2 condition. RESULTS: For tumor mechanism, they act as pro-oxidants, producing hydrogen peroxide that attacks the cancer, whereas, in normal conditions they act as protective antioxidants. CONCLUSIONS: The unlike reaction of specific antioxidants should be known at different cell stages. The aim of this study was to assess the antioxidative roles of alpha lipoic acid on kidney cancers during oxidative stress induction (Tab. 1, Fig. 7, Ref 27). Text in PDF www.elis.sk.Öğe Capsaicin inhibits cell proliferation by cytochrome c release in gastric cancer cells(Sage Publications Ltd, 2014) Meral, Öğünç; Alpay, Merve; Kısmalı, Görkem; Kosova, Funda; Çakır, Dilek Ülker; Pekcan, Mert; Sel, TevhideCapsaicin (trans-8-methyl-N-vanillyl-6-nonenamide) is the principal pungent component in hot peppers. The role of capsaicin in carcinogenesis is quite controversial. Although some investigators suspect that capsaicin is a carcinogen, co-carcinogen, or tumor promoter, others have reported that it has chemopreventive and chemotherapeutic effects. The present study aimed to evaluate the cytotoxicity and chemosensitizing activities of capsaicin alone and on 5-flourouracil (5-FU)-treated gastric cancer cells. In this study, the gastric cancer cell line HGC-27 was used and capsaicin used as a chemosensitizer and 5-flourouracil (5-FU) was used as chemotherapeutic. Cytotoxicity and chemosensitizing activities were analyzed with MTT assay; supernatant levels of LDH and glucose were detected as biochemical markers of cell viability; cytochrome c and AIF were evaluated with western blot; and additionally, wound-healing assays were employed. Results suggested that capsaicin had significant anticancer abilities; such capsaicin were capable of causing multifold decreases in the half maximal inhibitory concentration IC50 value of 5-FU. The continuing controversy surrounding consumption or topical application of capsaicin clearly suggests that more well-controlled epidemiologic studies are needed to evaluate the safety and efficacy of capsaicin use. In summary, the present study demonstrated that capsaicin has the potential to be used for treating gastric carcinoma with 5-FU in vitro.Öğe The Effects of Vitamin E on Antioxidant Enzyme Activity in HepG2 Cells(Kafkas Univ, Veteriner Fakultesi Dergisi, 2016) Balkan, Burcu Menekşe; Kısmalı, Görkem; Alpay, Merve; Sayıner, Serkan; Turan, Deniz; Balkan, Ali Burak; Sel, TevhideIt is aimed to investigate the effect of vitamin E, powerful antioxidant (alpha-tocopherol succinate) on antioxidant enzyme activities in hepatocellular carcinoma (HepG2) cells. The hepatocellular carcinoma cell line HepG2 was used and the cells were cultured in the absence (control) or presence of different dose of vitamin E (50 mM, 50 mu M and 10 mu M vitamin E) for 24 h. The effect of vitamin E (alpha-tocopherol succinate) on catalase (CAT), superoxide dismutase (SOD) and glutathione peroxidase (GPx) enzyme activities in hepatocarcinoma cells were measured by spectrophotometry. A significant decrease in GPx activity was detected in 50 mM vitamin E treated HepG2 cells. However a significant decrease occurred in 10 mu M and 50 mu M vitamin E applied HepG2 cells. SOD activity in study groups were lower than in control cells. In addition to this, the decrease in SOD activity in 50 mM vitamin E applied cells was significant. CAT enzyme activity in 50 mu m vitamin E applied HepG2 cells was higher and, in 10 mu M and 50 mM vitamin E applied HepG2 cells were lower than in control group. It was determined that vitamin E has a dose-dependent effect on antioxidant enzyme activity in HepG2 cells.Öğe The Effects of Vitamin E on Antioxidant Enzyme Activity in HepG2 Cells [1](2016) Balkan, Burcu Menekşe; Kısmalı, Görkem; Alpay, Merve; Sayıner, Serkan; Turan, Deniz; Balkan, Ali Burak; Sel, TevhideGüçlü bir antioksidan olan vitamin E'nin (alfa-tokoferolsüksinat) HepG2 hücrelerinde antioksidan enzim aktiviteleri üzerine etkisinin araştırılması amaçlanmıştır. Çalışma materyali olarak HepG2 hücre hattı kullanılmıştır. Vitamin E uygulanan hücreler çalışma grubunu vitamin E uygulaması yapılmayan hücreler kontrol grubunu oluşturmuştur. Çalışma grubu hücrelerine 10 µM, 50 µM, 50 mM dozlarda vitamin E uygulaması yapılarak, 24 saat sonunda HepG2 hücrelerinde antioksidan enzimlerden katalaz (CAT), süperoksitdismutaz (SOD) ve glutasyonperoksidaz (GPx) aktiviteleri spektrofotometrik olarak ölçülmüştür. 50 mM vitamin E uygulanan HepG2 hücrelerinde GPx enzim aktivitesinde anlamlı bir artış saptanmıştır. Ancak, 10 µM ve 50 µM vitamin E uygulanan HepG2 hücrelerinde ise anlamlı bir azalma meydana gelmiştir. Vitamin E uygulaması yapılan hücrelerdeki SOD aktivitesi vitamin E uygulaması yapılmayan kontrol grubuna göre daha düşük ölçülürken, 50 µM vitamin E uygulanan HepG2 hücrelerinde SOD aktivitesinde anlamlı azalma tespit edilmiştir. 50 µM vitamin E uygulanan HepG2 hücrelerindeki CAT enzim aktivitesi kontrol grubuna göre daha yüksek bulunurken, 10 ?M ve 50 mM vitamin E uygulanan hücrelerdeki CAT enzim aktivitesi kontrol grubuna göre daha düşük tespit edilmiştir. Vitamin E'nin HepG2 hücrelerinde antioksidan enzim aktiviteleri üzerinde doz-bağımlı etkisinin olduğu belirlenmiştirÖğe GSM-like radiofrequency exposure induces apoptosis via caspase-dependent pathway in infant rabbits(Comenius Univ, 2016) Meral, Öğünç; Özgür, Elçin; Kısmalı, Görkem; Güler, Gülnur; Alpay, Merve; Sel, Tevhide; Seyhan, NesrinBACKGROUND: There have been several Radio Frequency (RF) field researches on various populations and groups of different ages in recent years. However, the most important group for research has been declared as the pregnant women and their babies. OBJECTIVE: The aim of the study was to analyse the effect on apoptotic factors of RF fields on newborn rabbit liver tissues. MATERIALS AND METHODS: Cytochrome c and AIF (Apoptosis Inducing Factor) levels were measured by western blot and caspase 1, 3 and 9 activities were measured by colorimetric method. RESULTS: Cytochrome c and AIF levels were not altered, but all caspase activities were increased in female infant rabbits that exposed to 1800 MHz GSM-like RF signals when they reached 1 month of age and caspase 1 and caspase 3 levels were decreased in male infant rabbits that exposed to 1800 MHz GSM-like RF signals between 15th and 22nd days of the gestational period. Results showed that 1800 MHz GSM-like RF exposure might lead to apoptosis in infant rabbit's liver tissues. CONCLUSION: According to the results, we suggest that postnatal RF exposure causes caspase dependent apoptosis in female infant rabbits liver tissues (Tab. 1, Fig. 2, Ref. 27). Text in PDF www.elis.sk.Öğe The investigation antiproliferative and apoptotic effects of capsaicin and alpha lipoic acid on colon adenocarcinoma cells(Lippincott Williams & Wilkins, 2015) Alpay, Merve; Kısmalı, Görkem; Sel, Tevhide; Karagül, Hilal…Öğe Oxidative status of colitis-associated cancer model induced by azoxymethane /dextran sulfate sodium and the effects of COX-2 inhibitor in mice(Ankara Univ Press, 2019) Kısmalı, Görkem; Üner, Aykut Göktürk; Meral, Öğünç; Alpay, Merve; Salmanoğlu, Berrin; Çakır, Dilek Ülker; Sel, TevhideNatural products and anti-inflammatory agents including cyclooxygenase-2 (COX-2) inhibitors which is a type of nonsteroidal anti-inflammatory drugs (NSAIDs) are highly considerable interest for the prevention of carcinogenesis. The objective of this study is to evaluate the oxidative status of colitis-associated cancer induced by azoxymethane (AOM)/dextran sulfate sodium (DSS), and the effects of COX-2 inhibitor in mice. Totally 40 mice were randomized and divided to four groups. All animals except control and Cox-2 inhibitor alone group received AOM/DSS to establish colitis-associated cancer model as reported elsewhere. COX-2 preferential inhibitor meloxicam was used to minimize side effects such as gastrointestinal hemorrhage. Meloxicam were used (5mg/kg, intraperitoneal) three times a week with meloxicam alone and AOM/DSS + meloxicam group. Superoxide dismutase (SOD), Glutathione peroxidase (GPx), Malondialdehyde (MDA) and Advanced Oxidation Protein Products (AOPP) which all of them are oxidative stress markers were measured by spectrophotometrically. The combination treatment of Meloxicam and AOM/DSS significantly increased (P<0.05) SOD activities in mice. GPx activities were found significantly increased (P<0.05) in Meloxicam and AOM/DSS combinations or alone. There were no differences between the control and treatment groups of MDA levels. AOPP levels of Meloxicam and AOM/DSS combination group were found higher than the other groups. Meloxicam and /or AOM/DSS treatment not caused lipid peroxidations, but increased the antioxidant enzymes and Advanced Oxidation Protein Products levels.Öğe Piperlongumine inhibits cell growth and enhances TRAIL-induced apoptosis in prostate cancer cells(Wolters Kluwer Medknow Publications, 2020) Kismali, Gorkem; Ceylan, Ahmet; Meral, Ogunc; Alpay, Merve; Kosova, Funda; Cakir, Dilek Ulker; Sel, TevhideObjective: To investigate whether piperlongumine can sensitize prostate cancer cells to tumor necrosis factor-related apoptosis- inducing ligand (TRAIL) and trigger apoptosis in prostate cells. Methods: Human prostate cancer cell lines PC3, LNCaP, and VCaP were cultured with piperlongumine and TRAIL. Then, cell proliferation, migration, caspase activation, apoptotic protein expressions, and death receptor expressions were measured. Results: Piperlongumine inhibited cell proliferation at low doses (<10 mu M) alone and in combination with TRAIL (25 ng/mL), induced apoptosis, and suppressed cyclooxygenase activation. Additionally, piperlongumine induced expression of death receptors which potentiated TRAIL-induced apoptosis in cancer cells but did not affect decoy receptors. Piperlongumine also downregulated tumor cell-survival pathways, inhibited colony formation and migration of cancer cells alone or in combination with TRAIL. The combination of piperlongumine with TRAIL was found to be synergistic. Conclusions: Our findings indicate that piperlongumine can sensitize cancer cells to TRAIL through the upregulation of death receptors and can trigger apoptosis with the downregulation of anti- apoptotic proteins.Öğe Piperlongumine inhibits cell growth and triggers apoptosis via intrinsic pathway in prostate cancer cells(Elsevier Sci Ltd, 2015) Kısmalı, Görkem; Alpay, Merve; Meral, Öğünç; Ceylan, Ahmet; Janeklang, Somkid; Kosova, Funda; Sel, Tevhide…
