22 results on '"Dede, S."'
Search Results
2. Electrospraying deposition and characterization of potassium chloride targets for nuclear science measurements
- Author
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Dede, S., Essenmacher, S.D., Gastis, P., Manukyan, K.V., Kuvin, S.A., Lee, H.Y., Roach, J.M., Burns, P.C., and Aprahamian, A.
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- 2023
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3. Breakup of 8B+natZr at the sub-barrier energy of 26.5 MeV
- Author
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Palli K., Pakou A., Moro A. M., O’ Malley P. D., Acosta L., Sántzez-Bénitez A., Souliotis G., Aguilera E. F., Andrade E., Godos D., Sgouros O., Soukeras V., Agodi C., Bailey T. L., Bardayan D. W., Boomershine C., Brodeur M., Cappuzzello F., Caramichael S., Cavallaro M., Dede S., Dueñas J.A., Henning J., Lee K., Porter W.S., Rivero F., and von Seeger W.
- Subjects
Physics ,QC1-999 - Abstract
In our systematic research on reactions with weakly bound nuclei at suband nearbarrier energies, we have studied the system 8B+natZr at the sub-barrier energy of 26.5 MeV. Our measurements, performed at the TriSol radioactive beam facility of the University of Notre Dame, include angular distributions of both elastic scattering and breakup, for the determination of the total reaction and breakup cross sections as well as the direct-to-total reaction cross section ratio. Preliminary results of the breakup analysis will be presented, supported by Continuum Discretized Coupling Channel calculations.
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- 2024
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4. Correction to: In Vitro Evaluation of the Apoptotic, Autophagic, and Necrotic Molecular Pathways of Fluoride
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Urut, F., Dede, S., Yuksek, V., Cetin, S., Usta, A., and Taspinar, M.
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- 2021
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5. P09.01 Single-cell transcriptomic atlas-guided development of chimeric antigen-receptor (CAR) T cells for the treatment of acute myeloid leukemia
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Gottschlich, A, primary, Thomas, M, additional, Grünmeier, R, additional, Lesch, S, additional, Rohrbacher, L, additional, Igl, V, additional, Briukhovetska, D, additional, Benmebarek, M, additional, Dede, S, additional, Müller, K, additional, Xu, T, additional, Dhoqina, D, additional, Umut, Ö, additional, Märkl, F, additional, Robinson, S, additional, Sendelhofert, A, additional, Schulz, H, additional, Vick, B, additional, Cadilha, BL, additional, Brabenec, R, additional, Röder, N, additional, Rataj, F, additional, Nüesch, M, additional, Wellbrock, J, additional, Modemann, F, additional, Fiedler, W, additional, Kellner, C, additional, Herold, T, additional, Paquet, D, additional, Jeremias, I, additional, von Baumgarten, L, additional, Endres, S, additional, Subklewe, M, additional, Marr, C, additional, and Kobold, S, additional
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- 2022
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6. OS03.4.A In vivo dynamics and anti-tumor effects of EpCAM-directed CAR T-cells against brain metastases from lung cancer
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Xu, T, primary, Karschnia, P, additional, Cadilha, B, additional, Dede, S, additional, Lorenz, M, additional, Seewaldt, N, additional, Nikolaishvili, E, additional, Müller, K, additional, Blobner, J, additional, Teske, N, additional, Langer, S, additional, Obeck, H, additional, Lorenzini, T, additional, Mulazzani, M, additional, Zhang, W, additional, Ishikawa-Ankerhold, H, additional, Buchholz, V R, additional, Subklewe, M, additional, Thon, N, additional, Straube, A, additional, Tonn, J, additional, Kobold, S, additional, and von Baumgarten, L, additional
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- 2022
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7. (Li6, d) and (Li6, t) reactions on Ne22 and implications for s -process nucleosynthesis
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Ota, S., primary, Christian, G., additional, Catford, W. N., additional, Lotay, G., additional, Pignatari, M., additional, Battino, U., additional, Bennett, E. A., additional, Dede, S., additional, Doherty, D. T., additional, Hallam, S., additional, Herwig, F., additional, Hooker, J., additional, Hunt, C., additional, Jayatissa, H., additional, Matta, A., additional, Moukaddam, M., additional, Rao, E., additional, Rogachev, G. V., additional, Saastamoinen, A., additional, Scriven, D., additional, Tostevin, J. A., additional, Upadhyayula, S., additional, and Wilkinson, R., additional
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- 2021
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8. Phenolic Contents, Antioxidant Activities, LCMS Profiles of Mespilus germanica Leaf Extract and Effects on mRNA Transcription Levels of Apoptotic, Autophagic, and Necrotic Genes in MCF7 and A549 Cancer Cell Lines.
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Görmez G, Yüksek V, Usta A, Dede S, and Gümüş S
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- Humans, MCF-7 Cells, Autophagy drug effects, A549 Cells, Mass Spectrometry, Transcription, Genetic drug effects, Necrosis, Plant Leaves chemistry, Plant Extracts pharmacology, Plant Extracts chemistry, Antioxidants pharmacology, Apoptosis drug effects, Phenols pharmacology, RNA, Messenger genetics, RNA, Messenger metabolism
- Abstract
Cancer, defined by the continuous, uncontrollable proliferation of cells in the human body, is a disease with a rapidly increasing incidence and mortality rate. Scientists are looking for novel ways to cure and prevent this sneaky disease because of the toxicity of contemporary chemotherapy and the cancer cells' resilience to anticancer drugs. Determining the effect of herbal medicines, which do not have as harmful side effects as synthetic drugs, on cancer cell lines is an essential preliminary study in the production of effective drugs against cancer. In this study, the phenolic acid profile, antioxidant capacity, and cytotoxicity of the medicinal plant Mespilus germanica (MG) leaf extract were determined, and its effects on the expression of some apoptotic, necrotic, and autophagic pathway genes of MCF7 (Human breast cancer line) and A549 (Human lung cancer line) and healthy HDF (Human Dermal Fibroblasts) cells were investigated for the first time. The LCMS device detected many important phenolic compounds previously reported to act against cancer cells in Mespilus germanica leaf extract. DPPH and total phenolic content showed high antioxidant capacity. The cytotoxicity of MG was determined by the MTT method. The levels of mRNA transcription for Atg5, Atg3, Rıpk1, Bcl2, Bax, Apaf1, Caspase-8, Caspase-7, Caspase-3, and Caspase-9, as well as the expression patterns of the DNA damage markers P53 and Parp-1 genes, were assessed. MG leaf extract did not cause significant toxicity against healthy HDF cells. However, it had a cytotoxic effect on A549 and MCF7 cancer cell lines, increasing the transcription levels of essential genes involved in cell death mechanisms. This research is the first to analyze the phenolic components and antioxidant capabilities of leaf extracts from Mespilus germanica. Additionally, it investigates the impact of these extracts on crucial genes involved in cell death pathways of A549 lung cancer, MCF7 breast cancer, and non-cancerous HDF (Human Dermal Fibroblasts) cells., (© 2024. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)
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- 2024
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9. A novel graphene oxide-based fluorescence method for detection of urine glycosaminoglycans.
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Kösoğlu CB, Dede S, Karakuş E, Erdoğmuş A, Keskin B, and Önal H
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- Humans, Spectrometry, Fluorescence, Rhodamines chemistry, Fluorescent Dyes chemistry, Fluorescence, Mucopolysaccharidoses urine, Mucopolysaccharidoses diagnosis, Graphite chemistry, Glycosaminoglycans urine, Glycosaminoglycans chemistry
- Abstract
Glycosaminoglycans (GAGs) serve as a biomarker for mucopolysaccharidoses disease. In this study, a novel fluorometric method was developed to measure total GAGs in urine. Graphene oxide (GO) and rhodamine B (RhB), a cationic fluorescent dye, were employed in the development of the method. RhB attaches to the GO surface via electrostatic attraction, leading to the quenching of its fluorescence upon the establishment of the RhB-GO complex. However, the presence of GAGs prompts a resurgence of intense fluorescence. The linear range of the method is between 5.00 and 70.00 mg/L. The total GAG levels of urine samples analyzed using the method agree with the results of the biochemistry analysis laboratory (65.85 and 79.18 mg/L; 73.30 ± 1.76 and 72.21 ± 2.21). The method is simple, accurate, and sensitive and may be used for both first-step diagnosis of the mucopolysaccharidoses and detection of individual GAGs for studies of GAG-related research and other biological applications., (© 2024 International Union of Biochemistry and Molecular Biology, Inc.)
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- 2024
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10. Lycopene prevents cell death in NRK-52E cells by inhibition of high glucose-activated DNA damage and apoptotic, autophagic, and necrotic pathways.
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Usta A, Yüksek V, Çetin S, and Dede S
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- Humans, Lycopene pharmacology, Cell Death, Necrosis, Glucose pharmacology, Autophagy, DNA Damage
- Abstract
This study aims to investigate the effects of lycopene on apoptotic, autophagic, and necrotic pathways, oxidative status, and DNA damage in diabetic nephropathy at the molecular level. The sample of the study includes seven groups: lycopene (L), high glucose (G), high glucose + lycopene (GL), and control (C) groups tested at 12 and 24 h. The expression levels of genes in oxidative, apoptotic, autophagic, and necrotic cell death pathways are determined by reverse transcription-quantitative polymerase chain reaction analysis. The comet assay method is used for the analysis of DNA damage. It is observed that adding lycopene to high glucose for protective purposes reduces the expression of genes related to apoptosis, autophagy, and necrosis, as well as the DNA damage index, compared to cells given high glucose alone. Lycopene can be a safe and effective alternative agent., (© 2024 The Authors. Journal of Biochemical and Molecular Toxicology published by Wiley Periodicals LLC.)
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- 2024
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11. Measurement of the ^{13}C(α, n_{0})^{16}O Differential Cross Section from 0.8 to 6.5 MeV.
- Author
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deBoer RJ, Febbraro M, Bardayan DW, Boomershine C, Brandenburg K, Brune C, Coil S, Couder M, Derkin J, Dede S, Fang R, Fritsch A, Gula A, Gyürky G, Hackett B, Hamad G, Jones-Alberty Y, Kelmar R, Manukyan K, Matney M, McDonaugh J, Meisel Z, Moylan S, Nattress J, Odell D, O'Malley P, Paris MW, Robertson D, Shahina, Singh N, Smith K, Smith MS, Stech E, Tan W, and Wiescher M
- Abstract
The cross section of the ^{13}C(α,n)^{16}O reaction is needed for nuclear astrophysics and applications to a precision of 10% or better, yet inconsistencies among 50 years of experimental studies currently lead to an uncertainty of ≈15%. Using a state-of-the-art neutron detection array, we have performed a high resolution differential cross section study covering a broad energy range. These measurements result in a dramatic improvement in the extrapolation of the cross section to stellar energies potentially reducing the uncertainty to ≈5% and resolving long standing discrepancies in higher energy data.
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- 2024
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12. Vitamin D may assist the UPR against sodium fluoride-induced damage by reducing RIPK1, ATG5, BECN1, oxidative stress and increasing caspase-3 in the osteoblast MC3T3-E1 cell line.
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Yüksek V, Dede S, Çetin S, Usta A, and Taşpınar M
- Subjects
- Mice, Animals, Caspase 3 metabolism, Fluorine, Superoxide Dismutase-1 metabolism, Cell Line, Endoplasmic Reticulum Stress, Osteoblasts metabolism, Oxidative Stress, Apoptosis, Sodium Fluoride toxicity, Vitamin D metabolism
- Abstract
Background: Out of all measure systemic exposure to fluorides can cause defect of skeletal and dental fluorosis. Endoplasmic reticulum (ER) stress is caused by fluorine-induced oxidative stress and importance of vitamin D in its prevention is not known enough in bone cells. This study was carried out to investigate fluorine-induced oxidative stress, ER stress, and death pathways and the effect of vitamin D on them., Methods: MC3T3-E1 mouse osteoblast cell line was used as the material of the study. The NaF and vitamin D concentrations were determined by the MTT assay. NaF treatments and vitamin D supplementation (pre-add, co-add, and post-add) was administered in the cell line at 24th and 48th hours. The expression of the genes in oxidative stress, ER stress, and death pathways was determined using RT-qPCR and Western blotting techniques., Results: Vitamin D significantly reduced mRNA expression levels of SOD2, CYGB, ATF6, PERK, IRE1, ATG5 and BECN1 whereas caused an increase in levels GPX1, SOD1, NOS2 and Caspase-3 in MC3T3-E1 mouse osteoblast cell line of NaF-induced. In addition, GPX1, SOD1, ATF6, PERK, IRE1, BECN1, Caspase-3 and RIPK1 protein levels were examined by Western blot analysis, and it was determined that vitamin D decreased IRE1 and PERK protein levels, but increased GPX1, SOD1, ATF6 and Caspase-3 protein levels., Conclusion: The findings of the study suggest that vitamin D has protective potential against NaF-induced cytotoxicity reasonably through the attenuation of oxidative stress, ER stress, ATG5, IRE1 and by increasesing caspase-3 in vitro conditions., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier GmbH. All rights reserved.)
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- 2023
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13. Single-cell transcriptomic atlas-guided development of CAR-T cells for the treatment of acute myeloid leukemia.
- Author
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Gottschlich A, Thomas M, Grünmeier R, Lesch S, Rohrbacher L, Igl V, Briukhovetska D, Benmebarek MR, Vick B, Dede S, Müller K, Xu T, Dhoqina D, Märkl F, Robinson S, Sendelhofert A, Schulz H, Umut Ö, Kavaka V, Tsiverioti CA, Carlini E, Nandi S, Strzalkowski T, Lorenzini T, Stock S, Müller PJ, Dörr J, Seifert M, Cadilha BL, Brabenec R, Röder N, Rataj F, Nüesch M, Modemann F, Wellbrock J, Fiedler W, Kellner C, Beltrán E, Herold T, Paquet D, Jeremias I, von Baumgarten L, Endres S, Subklewe M, Marr C, and Kobold S
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- Humans, T-Lymphocytes, Immunotherapy, Adoptive, Cell Line, Cell Line, Tumor, Transcriptome genetics, Leukemia, Myeloid, Acute genetics, Leukemia, Myeloid, Acute therapy, Leukemia, Myeloid, Acute metabolism
- Abstract
Chimeric antigen receptor T cells (CAR-T cells) have emerged as a powerful treatment option for individuals with B cell malignancies but have yet to achieve success in treating acute myeloid leukemia (AML) due to a lack of safe targets. Here we leveraged an atlas of publicly available RNA-sequencing data of over 500,000 single cells from 15 individuals with AML and tissue from 9 healthy individuals for prediction of target antigens that are expressed on malignant cells but lacking on healthy cells, including T cells. Aided by this high-resolution, single-cell expression approach, we computationally identify colony-stimulating factor 1 receptor and cluster of differentiation 86 as targets for CAR-T cell therapy in AML. Functional validation of these established CAR-T cells shows robust in vitro and in vivo efficacy in cell line- and human-derived AML models with minimal off-target toxicity toward relevant healthy human tissues. This provides a strong rationale for further clinical development., (© 2023. The Author(s), under exclusive licence to Springer Nature America, Inc.)
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- 2023
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14. Investigation of the presence of Capnophilic bacteria in routine urine cultures.
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Karahan ZC, Altinsoy İ, Çalişkan BN, Dede S, Kayiş G, Türkoğlu HC, Evren E, Doğanay Erdoğan B, Kiliç SG, Dolapçi İ, and Tekeli A
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- Humans, Drug Resistance, Multiple, Bacterial genetics, beta-Lactamases genetics, Escherichia coli, Anti-Bacterial Agents pharmacology, Anti-Bacterial Agents therapeutic use, Escherichia coli Infections microbiology, Urinary Tract Infections microbiology
- Abstract
Capnophilic Escherichia coli (CEC) strains are rarely isolated from urinary tract infections (UTIs). The purpose of this research was to look into the incidence and traits of the CEC strains that cause UTIs. Nine (0.11%) epidemiologically unrelated CEC isolates with varying antibiotic susceptibility patterns were identified from patients with various co-morbidities after the evaluation of 8500 urine samples. Three of these strains belonged to the O25b-ST131 clone, and none of them possessed the yadF gene. Due to adverse incubation conditions, CEC isolation is difficult. Although rare, capnophilic incubation of urine cultures may be considered particularly for patients with underlying predisposing conditions., (© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
- Published
- 2023
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15. The Effects of Vitamin D Application on NaF-Induced Cytotoxicity in Osteoblast Cells (hFOB 1.19).
- Author
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Dede S, Taşpinar M, Yüksek V, Çetin S, and Usta A
- Subjects
- Humans, Fluorine pharmacology, Fluorides pharmacology, Osteoblasts, Apoptosis, Sodium Fluoride toxicity, Vitamin D pharmacology, Vitamin D metabolism
- Abstract
This study was planned to evaluate the effect of vitamin D administration on cytotoxicity due to fluoride exposure in vitro. NaF (IC50) and vitamin D (proliferative) were applied to human osteoblast (hFOB 1.19) cells. The major genes of apoptotic, autophagic, and necrotic pathways were determined by RT-PCR. 2-∆∆Ct formulation was used for expression analysis. In the NaF group, caspase 3, Bax, Bad, Bak, Bclx, Atg3, Atg5, Atg6, pG2, LC3-I, LC3-II, RIP1, and RIP3 genes were increased (2.6-15 times). It was observed that the expressions of these genes approached the control when vitamin D was given together with NaF. The Bcl2 gene increased significantly (sixfold) with the effect of NaF, and was down-regulated to some extent with additional vitamin D administration, but still more than in the control. As a result, it was determined that apoptotic, necrotic, and autophagic pathways were activated as the molecular basis of the damage in the bone tissue, which was most affected by fluorine, and these genes were down-regulated and approached the control group with the addition of vitamin D. It was concluded that this is an important data to explain the molecular basis of the protective and therapeutic effect of vitamin D against fluorine toxicity., (© 2022. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)
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- 2023
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16. In vivo dynamics and anti-tumor effects of EpCAM-directed CAR T-cells against brain metastases from lung cancer.
- Author
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Xu T, Karschnia P, Cadilha BL, Dede S, Lorenz M, Seewaldt N, Nikolaishvili E, Müller K, Blobner J, Teske N, Herold JJ, Rejeski K, Langer S, Obeck H, Lorenzini T, Mulazzani M, Zhang W, Ishikawa-Ankerhold H, Buchholz VR, Subklewe M, Thon N, Straube A, Tonn JC, Kobold S, and von Baumgarten L
- Subjects
- Mice, Animals, Epithelial Cell Adhesion Molecule, Receptors, Antigen, T-Cell, Immunotherapy, Adoptive methods, Cytotoxicity, Immunologic, T-Lymphocytes, Antigens, Neoplasm, Lung Neoplasms therapy, Brain Neoplasms therapy
- Abstract
Lung cancer patients are at risk for brain metastases and often succumb to their intracranial disease. Chimeric Antigen Receptor (CAR) T-cells emerged as a powerful cell-based immunotherapy for hematological malignancies; however, it remains unclear whether CAR T-cells represent a viable therapy for brain metastases. Here, we established a syngeneic orthotopic cerebral metastasis model in mice by combining a chronic cranial window with repetitive intracerebral two-photon laser scanning-microscopy. This approach enabled in vivo -characterization of fluorescent CAR T-cells and tumor cells on a single-cell level over weeks. Intraparenchymal injection of Lewis lung carcinoma cells (expressing the tumor cell-antigen EpCAM) was performed, and EpCAM-directed CAR T-cells were injected either intravenously or into the adjacent brain parenchyma. In mice receiving EpCAM-directed CAR T-cells intravenously, we neither observed substantial CAR T-cell accumulation within the tumor nor relevant anti-tumor effects. Local CAR T-cell injection, however, resulted in intratumoral CAR T-cell accumulation compared to controls treated with T-cells lacking a CAR. This finding was accompanied by reduced tumorous growth as determined per in vivo -microscopy and immunofluorescence of excised brains and also translated into prolonged survival. However, the intratumoral number of EpCAM-directed CAR T-cells decreased during the observation period, pointing toward insufficient persistence. No CNS-specific or systemic toxicities of EpCAM-directed CAR T-cells were observed in our fully immunocompetent model. Collectively, our findings indicate that locally (but not intravenously) injected CAR T-cells may safely induce relevant anti-tumor effects in brain metastases from lung cancer. Strategies improving the intratumoral CAR T-cell persistence may further boost the therapeutic success., Competing Interests: Tao Xu, No disclosures; Philipp Karschnia, No disclosures; Bruno L. Cadilha, No disclosures; Sertac Dede, No disclosures; Michael Lorenz, No disclosures; Niklas Seewaldt, No disclosures; Elene Nikolaishvili, No disclosures; Katharina Müller, No disclosures; Jens Blobner, No disclosures; Nico Teske, No disclosures; Julika J. Herold, No disclosures; Kai Rejeski, Kite/Gilead: Research funding and travel support, Novartis: Honoraria, BMS/CELGENE: Consultancy, Honoraria; Sigrid Langer, No disclosures; Hannah Obeck, No disclosures; Theo Lorenzini, No disclosures; Matthias Mulazzani, No disclosures; Wenlong Zhang, No disclosures; Hellen Ishikawa-Ankerhold, No disclosures; Veit R. Buchholz, No disclosures; Marion Subklewe, No disclosures; Niklas Thon, No disclosures; Andreas Straube, No disclosures; Joerg-Christian Tonn, Research grants from Novocure and Munich Surgical Imaging, and Royalties from Springer Publisher Intl; Sebastian Kobold, S.K. has received honoraria from TCR2 Inc, Novartis, BMS and GSK, S.K. is an inventor of several patents in the field of immuno-oncology, S.K. received license fees from TCR2 Inc and Carina Biotech, S.K. received research support from TCR2 Inc. and Arcus Bioscience for work unrelated to the manuscript. Louisa von Baumgarten, No disclosures., (© 2023 The Author(s). Published with license by Taylor & Francis Group, LLC.)
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- 2023
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17. The effect of quinoa (Chenopodium quinoa) on apoptotic, autophagic, antioxidant and inflammation markers in glucocorticoid-induced insulin resistance in rats.
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Erfidan S, Dede S, Usta A, Yüksek V, and Çetin S
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- Animals, Antioxidants pharmacology, Antioxidants therapeutic use, Biomarkers metabolism, Blood Glucose metabolism, Glucocorticoids, Inflammation drug therapy, Insulin, Rats, Chenopodium quinoa metabolism, Diabetes Mellitus, Type 2 metabolism, Insulin Resistance
- Abstract
Background: Insulin resistance plays an important role in predicting type 2 diabetes that may develops. This study was planned in order to investigate the beneficial effects of quinoa (Chenopodium quinoa) use in glucocorticoid induced-insulin resistance., Methods and Results: Forty-two rats were used as the material (experimental) groups: the control group (C), the quinoa-administered group (Q), the insulin resistance-created group (IR), the IR + metformin group (IM), the IR + quinoa for treatment group (IQ) and the quinoa + IR for prophylaxis group (QI). Blood glucose, insulin levels and HOMA-IR were found to be highest (p < 0.05) in the IR group (p < 0.05). Glucose levels decreased significantly with the administration of quinoa and approached the levels of the control, but the insulin levels and the HOMA-IR did not significantly change. It was also observed that other biochemical parameters (ALT, AST, ALP, total cholesterol, total protein, urea and creatinine) changed significantly in the IR group and approached the levels of the control group with the administration of quinoa. Apoptotic (BCL2 5, BAX 9, CAS 3), autophagic (SQSTM1 7, ATG5) and inflammation (IL-1β, TNF-α) genes were upregulated by 5-11-fold in the IR group. In the groups in which quinoa was administered for treatment and protection, all these genes were found to be upregulated to a lower extent than the IR group. Antioxidant genes (GPX1, SOD1) increased by nine to tenfold in the quinoa groups., Conclusion: As a result, after administration of quinoa, it was determined that the glucose level increased due to experimental insulin resistance and the liver and kidney damage indicators decreased. It was determined that quinoa (Chenopodium quinoa) had significant beneficial effects on biochemical parameters and apoptotic, autophagic, antioxidant and inflammatory markers in experimental glucocorticoid-induced insulin resistance., (© 2022. The Author(s), under exclusive licence to Springer Nature B.V.)
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- 2022
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18. The Effects of Sodium Fluoride (NaF) Treatment on the PI3K/Akt Signal Pathway in NRK-52E Cells.
- Author
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Korkmaz R, Yüksek V, and Dede S
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- Animals, Fluorine pharmacology, Mammals metabolism, Phosphatidylinositol 3-Kinase metabolism, Phosphatidylinositols pharmacology, RNA, Messenger, Rats, Signal Transduction, Sodium Fluoride pharmacology, TOR Serine-Threonine Kinases metabolism, Phosphatidylinositol 3-Kinases metabolism, Proto-Oncogene Proteins c-akt metabolism
- Abstract
The effects of the element fluorine on the phosphoinositide-3-kinase-protein kinase B/Akt (PI3K/Akt) pathway has a significant role in regulation of intracellular molecular mechanisms. NRK-52E rat kidney epithelial cell line was selected as the material of the study. NaF was used as the fluorine source in the study. The NaF dose was determined with the MTT assay. The NaF concentrations were determined as the proliferation concentration of 10 μM and IC
25 (2250 μM) and IC50 (4250 μM) for 24 h. In the study, the erb-b2 receptor tyrosine kinase 2 (ERBB2), phosphoinositide-3-kinase (PI3K), Protein kinase B (PKB,Akt), Mammalian target of rapamycin (mTOR), and the Tumor protein 53 (TP53) genes were considered as the target genes. NaF concentration was administered on the cells. Total mRNA was isolated. mRNAs were turned into cDNA. The expression levels of the target genes were determined by RT-qPCR method. According to the results obtained in the study, the low NaF concentration increased the expression levels of the ERBB2, PI3K, and Akt genes, while the higher concentrations did not significantly affect these levels. The expression of mTOR decreased at all given concentrations. The expression of the TP53 gene did not change at the low concentration, while it increased at the high concentrations. Based on the results, it may be stated that fluorine may inhibit the kinase enzymes in the PI3K/Akt pathway. In summary, in the pathogenesis of the cell damage caused by fluorine in the NRK-52E cell line, the PI3K/Akt/mTOR pathway is an important signal pathway., (© 2021. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)- Published
- 2022
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19. The inhibitory effects of lycopene and thymoquinone on angiotensin converting enzyme from human plasma (An in vitro study).
- Author
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Dede S, Turkoglu V, and Bas Z
- Subjects
- Angiotensin-Converting Enzyme Inhibitors pharmacology, Humans, Lycopene pharmacology, Benzoquinones pharmacology, Peptidyl-Dipeptidase A
- Abstract
Angiotensin converting enzyme (ACE, EC 3.4.15.1) is an important enzyme responsible for regulating blood pressure. Inhibition of this enzyme is an important treatment approach in the treatment of hypertension, and natural or synthetic ACE inhibitors are often used for this purpose. In this study, the preventive effect of two important antioxidant compounds, lycopene (LYC) and thymoquinone (TQ) on ACE activity in human plasma was investigated. Human plasma was used as ACE source. ACE activity was calculated absorbance at 345 nm after incubation for 30 minutes at 35°C. TQ and LYC showed inhibitory effect on ACE activity. IC
50 values for TQ and LYC were determined as 314μM and 182 μM, respectively. Type of inhibition for TQ and lycopene from plot Line weaver-Burk was designated as non-competitive inhibition. The Ki constants of TQ and LYC were determined to be 707 μM and 167 μM, respectively. It was concluded that TQ and LYC may have significant potential as ACE inhibitors.- Published
- 2022
20. Determination of L-Phenylalanine in Human Plasma Samples with New Fluorometric Method.
- Author
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Sarı T, Dede S, Yusufoğlu B, and Karakuş E
- Abstract
The measurement of phenylalanine in biological fluids for the diagnosis of phenylketonuria (PKU) in newborns and the monitoring/therapeutic drug monitoring of individuals with PKU are especially important. Owing to the importance of PKU monitoring in clinical medicine, a new fluorometric method was developed for the determination of L-phenylalanine in serum samples. This method is based on the relationship between phenylalanine ammonia-lyase (PAL) and o-phthalaldehyde (OPA). PAL catalyzes the conversion of phenylalanine to ammonia and trans-cinnamic acid. The formed ammonia reacts with OPA in the presence of sodium sulfite, giving a fluorescent product. The presence of sulfide in an alkaline environment prevents OPA from reacting with other amino acids while allowing it to react only with ammonia. Method characterization and optimization studies, such as the effects of pH, temperature, and interferents, were carried out. The amount of L-phenylalanine in a human serum sample was successfully determined by using the fluorescence emission intensity of the fluorescent product formed as a result of the reaction between OPA and ammonia. The linear range of the method is between 10 μM and 10 mM. The obtained result showed good agreement with the results of the biochemistry analysis laboratory. Recoveries of 95.41% and 73.39% were obtained for phenylalanine and ammonia, respectively. This PAL-OPA-based fluorometric method for phenylalanine is practical, easy to operate, low cost, highly sensitive, and selective and can also be used for the simultaneous determination of ammonia in human serum samples., (© 2021. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)
- Published
- 2022
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21. Hyperstoichiometric Uranium Dioxides: Rapid Synthesis and Irradiation-Induced Structural Changes.
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Roach JM, Manukyan KV, Majumdar A, Dede S, Oliver AG, Burns PC, and Aprahamian A
- Abstract
Uranium dioxide (UO
2 ), the primary fuel for commercial nuclear reactors, incorporates excess oxygen forming a series of hyperstoichiometric oxides. Thin layers of these oxides, such as UO2.12 , form readily on the fuel surface and influence its properties, performance, and potentially geologic disposal. This work reports a rapid and straightforward combustion process in uranyl nitrate-glycine-water solutions to prepare UO2.12 nanomaterials and thin films. We also report on the investigation of the structural changes induced in the material by irradiation. Despite the simple processing aspects, the combustion synthesis of UO2.12 has a sophisticated chemical mechanism involving several exothermic steps. Raman spectroscopy and single-crystal X-ray diffraction (XRD) measurements reveal the formation of a complex compound containing the uranyl moiety, glycine, H2 O, and NO3 - groups in reactive solutions and dried combustion precursors. Combustion diagnostic methods, gas-phase mass spectroscopy, differential scanning calorimetry (DSC), and extracted activation energies from DSC measurements show that the rate-limiting step of the process is the reaction of ammonia with nitrogen oxides formed from the decomposition of glycine and uranyl nitrate, respectively. However, the exothermic decomposition of the complex compound determines the maximum temperature of the process. In situ transmission electron microscopy (TEM) imaging and electron diffraction measurements show that the decomposition of the complex compound directly produces UO2 . The incorporation of oxygen at the cooling stage of the combustion process is responsible for the formation of UO2.12 . Spin coating of the solutions and brief annealing at 670 K allow the deposition of uniform films of UO2.12 with thicknesses up to 300 nm on an aluminum substrate. Irradiation of films with Ar2+ ions (1.7 MeV energy, a fluence of up to 1 × 1017 ions/cm2 ) shows unusual defect-simulated grain growth and enhanced chemical mixing of UO2.12 with the substrate due to the high uranium ion diffusion in films. The method described in this work allows the preparation of actinide oxide targets for fundamental nuclear science research and studies associated with stockpile stewardship.- Published
- 2021
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22. In vivo two-photon characterization of tumor-associated macrophages and microglia (TAM/M) and CX3CR1 during different steps of brain metastasis formation from lung cancer.
- Author
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Zhang W, Karschnia P, von Mücke-Heim IA, Mulazzani M, Zhou X, Blobner J, Mueller N, Teske N, Dede S, Xu T, Thon N, Ishikawa-Ankerhold H, Straube A, Tonn JC, and von Baumgarten L
- Subjects
- Animals, Brain Neoplasms diagnostic imaging, Brain Neoplasms metabolism, Female, Lung Neoplasms diagnostic imaging, Lung Neoplasms metabolism, Mice, Mice, Inbred C57BL, Mice, Knockout, Phagocytosis, Brain Neoplasms secondary, CX3C Chemokine Receptor 1 physiology, Disease Models, Animal, Lung Neoplasms pathology, Microglia pathology, Microscopy, Fluorescence, Multiphoton methods, Tumor-Associated Macrophages pathology
- Abstract
Brain metastases frequently occur in lung cancer and dramatically limit prognosis of affected patients. The influence of tumor-associated macrophages and microglia (TAM/M) and their receptor CX3CR1 on different steps of brain metastasis formation from lung cancer is poorly characterized. We established a syngeneic orthotopic cerebral metastasis model in mice by combining a chronic cranial window with repetitive intravital 2-photon laser scanning microscopy. This allowed in vivo tracking of fluorescence-expressing tumor cells and TAM/M on a single-cell level over weeks. Intracarotid injection of red tdTomato-fluorescent Lewis lung carcinoma cell was performed in transgenic mice either proficient or deficient for CX3CR1. After intracarotid cell injection, intravascular tumor cells extravasated into the brain parenchyma and formed micro- and mature macrometastases. We observed potential phagocytosis of extravasated tumor cells by TAM/M. However, during later steps of metastasis formation, these anti-tumor effects diminished and were paralleled by TAM/M accumulation and activation. Although CX3CR1 deficiency resulted in a lower number of extravasated tumor cells, progression of these extravasated cells into micro metastases was more efficient. Overall, this resulted in a comparable number of mature macrometastases in CX3CR1-deficient and -proficient mice. Our findings indicate that unspecific inhibition of CX3CR1 might not be a suitable therapeutic option to prevent dissemination of lung cancer cells to the brain. Given the close interaction between TAM/M and tumor cells during metastasis formation, other therapeutic approaches targeting TAM/M function may warrant further evaluation. The herein established orthotopic mouse model may be a useful tool to evaluate such concepts in vivo., (Copyright © 2021. Published by Elsevier Inc.)
- Published
- 2021
- Full Text
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