Yazar "Kandemir, Sevgi Irtegun" seçeneğine göre listele

Listeleniyor 1 - 8 / 8
  • [ X ]
    Öğe
    Altered Expression of ADAMTSs and HAPLNs in Preeclamptic Placenta
    (Aves, 2018) Kandemir, Sevgi Irtegun; Taskin, Irmak Icen; Pektanc, Gulsum; Tekin, Mehmet Ali; Demircan, Kadir
    Objective: Preeclampsia (PE) is a pregnancy-specific complication defined by the new onset of hypertension and proteinuria during the second trimester of pregnancy. The pathogenesis of PE remains poorly understood. Revealing the key factors involved in placental dysfunction is critical for the understanding the pathogenesis of PE. The aim of this study was to determine the expression levels of ADAMTSs and their molecular partners, TIMP-3 and HAPLNs in the placental tissues of women with PE. Materials and Methods: Experimental research was conducted on control and preeclamptic placentas. A total of 10 control and 10 preeclamptic placentas were included in the present study. The expression levels of ADAMTSs, HAPLNs, and TIMP-3 were analyzed in two groups by Western blot. Results: The expression levels of ADAMTS-4, -8, -10, -12, -13, -14, -16, and -19 were considerably lower, whereas the expression levels of HAPLN-1, -2, and -4; ADAMTS-18; and TIMP-3 were significantly higher in preeclamptic placentas than in controls. Conclusion: Altered expression levels of ADAMTSs and their molecular partners, TIMP-3 and HAPLNs, may contribute to the pathogenesis of PE.
  • [ X ]
    Öğe
    Antiproliferative effect of Potentilla fulgens on glioblastoma cancer cells through downregulation of Akt/mTOR signaling pathway
    (Wolters Kluwer Medknow Publications, 2023) Kandemir, Sevgi Irtegun; Ipek, Polat
    Background: Glioblastoma multiforme (GBM) is the most aggressive brain tumor that is common among adults. This aggression is due to increased invasion, migration, proliferation, angiogenesis, and decreased apoptosis. Plant-based compounds have a high potential to be used as an anticancer agent due to their various mechanisms and less undesirable side effects. Potentilla fulgens is a medicinal plant, and methanolic root extract of P. fulgens (PRE) has anti-inflammatory and anticancer properties.Objective: In this study, we aimed to investigate antiproliferative effect of PRE on U118 and T98G glioblastoma cancer cells and to reveal which molecular signaling pathways regulate this mechanism of action.Materials and Methods: The effect of PRE on cell viability of GBM cells was investigated by MTT assay. Involvement of PRE with cell growth and survival signaling pathways, phosphatidylinositol 3-kinase (PI3K)/Akt/mTOR and c-Src/signal transducer and activator of transcription 3 (STAT3), was examined using Western Blot.Results: PRE reduced cell viability of GBM and human dermal fibroblast (HDF) cells in a dose-and time-independent manner. PI3K expression/phosphorylation level remained unchanged in both GBM and HDF cells after PRE treatment, but Akt/mTOR signaling pathway was downregulated in PRE-treated cells. PRE treatment did not affect c-Src expression/phosphorylation level in GBM cells; however, expression of c-Src was suppressed in HDF cells. Similar results were observed for STAT3 expression and phosphorylation status.Conclusion: PRE has the ability to suppress cell viability in GBM cells, by targeting the Akt/mTOR signaling pathway.
  • [ X ]
    Öğe
    A detailed study on chemical and biological profile of nine Euphorbia species from Turkey with chemometric approach: Remarkable cytotoxicity of E-fistulasa and promising tannic acid content of E-eriophora
    (Elsevier Science Bv, 2018) Yener, Ismail; Olmez, Ozge Tokul; Ertas, Abdulselam; Yilmaz, Mustafa Abdullah; Firat, Mehmet; Kandemir, Sevgi Irtegun; Ozturk, Mehmet
    The propose of this study is to investigate the chemical constituents of nine Euphorbia species; namely, E. aleppica, E. eriophora, E. macroclada, E. grisophylla, E. seguieriana subsp. seguieriana, E. craspedia, E. denticulata, E. falcata and E. fistulosa by LC-MS/MS as well as their antioxidant, anticholinesterase, tyrosinase inhibitory, urease inhibitory and cytotoxic activities. Among 59 extracts prepared from the different parts of the mentioned Euphorbia species, E. seguieriana subsp. seguieriana leaf (IC50: 10.41 +/- 0.93 mu g/mL) in lipid peroxidation inhibitory by beta-carotene-linoleic acid assay exhibited the highest activity, while E. grisophylla root in DPPH free radical scavenging (IC50: 0.79 +/- 0.01 mu g/mL), E. grisophylla seed in ABTS cation radical scavenging (IC50: 8.93 +/- 0.02 mu g/mL), E. fistulosa root both in acetyl- and butyryl-cholinesterase inhibitory (53.71 +/- 1.89% and 77.63 +/- 0.60% inhibition, respectively), E. denticulata leaf in urease inhibitory (96.89 +/- 2.00% inhibition), and E. macroclada mixed in tyrosinase inhibitory (86.99 +/- 3.77% inhibition) activities. However in cytotoxic activity studies, E. denticulata against PDF fibroblast cell lines (IC50: 23.04 +/- 0.03 mu g/mL), E. craspedia against HT-29 cancer cell line (IC50: 13.74 +/- 0.02 mu g/mL), E. fistulosa against MCF-7 and DLD-1 cancer cell lines (IC50: 14.04 +/- 0.04 mu g/mL and IC50: 20.23 +/- 0.08 mu g/mL, respectively) indicated quite good activity. According to the LC-MS/MS results, these species were rich in quinic acid, malic acid and tannic acid, rutin, hesperidin and hyperoside. Incidentally, it was found that the E. eriophora possessed very strong irritating potential. A chemometric approach using principal component analysis (PCA) and hierarchical clustering analysis (HCA) techniques were also studied on collected data to reveal the relationship between chemical contents of different parts of these Euphorbia species, and their biological activities, together with regional differences. Overall, these species could be suggested as valuable sources of natural-bioactive agents for developing new functional, pharmacological and health promoting ingredients.
  • [ X ]
    Öğe
    Economic fast synthesis of olive leaf extract and silver nanoparticles and biomedical applications
    (Taylor & Francis Inc, 2022) Atalar, Mehmet Nuri; Baran, Ayse; Baran, Mehmet Firat; Keskin, Cumali; Aktepe, Necmettin; Yavuz, Omer; Kandemir, Sevgi Irtegun
    In this study, silver nanoparticles (AgNPs) were synthesized economically and simply using an environmentally friendly method with the extract obtained from agricultural waste olive leaves. AgNPs synthesized according to the analysis data were determined to have maximum absorbance at 433.5 nm wavelength, spherical appearance, 7.2 nm crystal nano size and -19.9 mV zeta potential. It was determined by the microdilution method with Minimum Inhibition Concentration (MIC) that AgNPs exert a suppressive effect on the growth of pathogen gram-negative, positive bacteria and yeast at very low concentrations. The cytotoxic effects of the particles were investigated on healthy cell lines (HDF) and cancerous cell lines (U118, CaCo-2, Skov-3). AgNPs showed up to 70% suppression in cancer cell lines.
  • [ X ]
    Öğe
    Effects of black cumin seed oil on oxidative stress and expression of membrane-cytoskeleton linker proteins, radixin, and moesin in streptozotocin-induced diabetic rat liver
    (Kare Publ, 2022) Seker, Ugur; Kaya, Seval; Kandemir, Sevgi Irtegun; Sener, Dila; Demirel, Ozlem Unay; Nergiz, Yusuf
    Background and Aim: This study examined the effects of black cumin seed oil treatment on oxidative stress and the expression of radixin and moesin in the liver of experimental diabetic rats. Materials and Methods: Eighteen rats were divided into 3 equal groups (control, diabetes, treatment). The control group was not exposed to any experimental treatment. Streptozotocin was administered to the rats in the diabetes and treatment groups. A 2.5 mL/kg dose of black cumin seed oil was administered daily for 56 days to the treatment group. At the conclusion of the experiment, the blood level of malondialdehyde (MDA) and glutathione (GSH) was measured. The expression level and the cellular distribution of radixin and moesin in the liver were analyzed. Results: The plasma MDA (3.05 +/- 0.45 nmol/mL) and GSH (78.49 +/- 20.45 mu mol/L) levels in the diabetes group were significantly different (p<0.01) from the levels observed in the control group (MDA: 1.09 +/- 0.31 nmol/mL, GSH: 277.29 +/- 17.02 mu mol/L) and the treatment group (MDA: 1.40 +/- 0.53 nmol/mL, GSH: 132.22 +/- 11.81 mu mol/L). Immunohistochemistry and western blotting analyses indicated that while the level of radixin was not significantly between the groups (p>0.05) and moesin expression was significantly downregulated (p<0.05) in the experimental group, the treatment was ineffective. Conclusion: The administered dose was sufficient to prevent oxidative stress, but was not sufficient to alleviate the effects of diabetes on moesin expression in hepatic sinusoidal cells.
  • [ X ]
    Öğe
    Evaluation of protein levels of autophagy markers (Beclin 1 and SQSTM1/p62) and phosphorylation of cyclin E in the placenta of women with preeclampsia
    (C M B Assoc, 2017) Yildiz, Dilara Akcora; Kandemir, Sevgi Irtegun; Agacayak, Elif; Deveci, Engin
    Preeclampsia is a severe multisystem disorder, and its pathophysiology is still not completely understood. Autophagy, a recycling process that maintains cellular homoeostasis during differentiation and development, is controversial regarding increased or decreased autophagic activity in preeclampsia. The aim of this study was to determine whether autophagy is increased in the placentas of women with preeclampsia by examining the protein levels of autophagy markers (Beclin 1 and SQSTM1/p62) and phosphorylation of cyclin E. For this purpose, placentas from preeclampsia (n=10) and control (n=10) pregnancies were included in this study. The protein expression of autophagy-related markers Beclin1, SQSTM1/p62 and phosphorylation status of cyclin E were detected by Western blot. Our data showed that the protein levels of both Beclin 1 and SQSTM1/p62 were significantly increased, while the phosphorylation level of cyclin E was significantly decreased in placentas with preeclampsia compared to those derived from controls. The results of this study suggest that the autophagic activity is perpetually increased in preeclampsia and cyclin E protein stabilisation might be involved in the induction of autophagy.
  • [ X ]
    Öğe
    Polymorphism in the second intron of the FGFR2 gene rs1219648 associated with the early-onset breast cancer in Turkish population
    (E-Century Publishing Corp, 2017) Taskin, Irmak Icen; Tekin, Mehmet A.; Pektanc, Gulsum; Munzuroglu, Omer; Kandemir, Sevgi Irtegun
    The incidence of early-onset breast cancer has been increased up to 25% in the developing countries. Several studies reported that breast cancer cases in younger women have different biological characteristics than others. These patients should be studied separately. Lack of the necessary information about the younger patients prevents significant improvements about diagnosis and treatment strategies targeting these patients. Polymor-phisms within intron 2 of the FGFR2 gene have been associated with postmenopausal breast cancer patients in many populations. However, there exists no research on the impact of rs1219648 on early-onset breast cancer in Turkish population. In this study, the association of rs1219648 with early-onset breast cancer in Turkish women has been investigated. A total of 171 subjects, including 75 female breast cancer patients who were less than or equal to 40 years of age and 96 age-matched healthy controls were recruited. Our results indicate that G allele of the rs1219648 is statistically correlated with early-onset breast cancer (OR 2.0098, 95% CI 1.3016-3.1032, P=0.002). When rs1219648 was examined as a categorical variable where the reference category related to the wild-type genotype (AA), the calculated OR was [2.112 (95% CI 0.9904-4.5058), P= 0.053], and [5.2308 (95% CI 1.939114.1102), P=0.001], for genotypes AG and GG, respectively. We present the first report on FGFR2 rs1219648 polymorphism in early-onset breast cancer in Turkish women. Our results propose that rs1219648 polymorphism individually confers susceptibility for development of early-onset breast cancer in the Turkish populations.
  • [ X ]
    Öğe
    A potential species for cosmetic and pharmaceutical industries: Insight to chemical and biological investigation of naturally grown and cultivated Salvia multicaulis Vahl
    (Elsevier, 2021) Akdeniz, Mehmet; Yener, Ismail; Yilmaz, Mustafa Abdullah; Kandemir, Sevgi Irtegun; Tekin, Fethullah; Ertas, Abdulselam
    The importance of Salvia L. species, being used as traditional medicine, in the scientific world is increasing day by day. The relationship between health and traditional-modern life, promotes the creation of new value added food products. Within this context, in this study, it was aimed to biologically and chemically investigate the essential oil and ethanol extracts of the Salvia multicaulis Vahl. Chemical and biological study results of naturally grown and cultivated (uninvestigated in the literature) samples of S. multicaulis were compared. The essential oil, aroma and terpenoid-steroid contents of the species were determined by gas chromatography-mass spectrometry (GC-MS) and phenolic content by liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS). In addition, the bioactivities of the extracts were screened for antioxidant, cytotoxic, antialzheimer, antiurease, antityrosinase, antielastase and anticollagenase activities. It was found that the enzyme activities of the essential oil and the antioxidant activities of all ethanol extracts of the species were quite high. It was determined that especially essential oil and the ethanol extracts of the leaf parts exhibited high cytotoxic effect in cancer cell lines (PDF (Healthy primary dermal fibroblast cell line), HT-29 (colon cancer cell line), MCF-7 (breast cancer cell line), Caco-2 (colon cancer cell line) and Skov-3 (ovary cancer cell line)). According to the GC-MS results, in the natural specimen 1,8-cineole (33.05 %) and D-limonene (21.18 %), in the cultivated sample 1,8-cineole (42.35 %) and alpha-pinene (15.74 %) were detected to be as the major components of the essential oil and aroma, respectively. It was observed that both natural and cultivated samples were rich in beta-Sitosterol. Moreover, the root extract of natural samples was found to be richer than the other extracts in terms of abieatane diterpene (ferruginol, cryptanol, sugiol, and inuroyleanone) compounds. According to the LC-MS/MS results, it is seen that both natural and cultivated samples are very rich in rosmarinic acid. Especially, the flower part of the natural sample (98.10 mg analyte/g extract) was found to contain more rosmarinic acid than the other parts. Due to the high total phenolic and rosmarinic acid content, cytotoxic, anti-aging, and antioxidant potential of the ethanol extract of the leaf parts of the species, it has the potential to be used as a food supplement, food preservative and in the pharmaceutical industry.