Molecular Biology and Genetics / Moleküler Biyoloji ve Genetik
Permanent URI for this collectionhttps://hdl.handle.net/11147/9
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Article Citation - WoS: 5Citation - Scopus: 5Angelica Sylvestris and Delphinium Staphisagria Extracts Induces Antiproliferation Through Caspase-Mediated Apoptosis on Human Cancer Cells(Instituto de Tecnologia do Parana, 2022) Akgün, Oğuzhan; Akgün, Halime; Şahin, Çağatay; Çelikler, Serap; Arı, FerdaAngelica sylvestris and Delphinium staphisagria are medicinal and aromatic herbs with a long history in medicine and food industry. In this study, we have investigated anti-cancer activity of Angelica sylvestris and Delphinium staphisagria extracts on various cell lines of lung (A549), breast (MCF-7), colon (HT-29), and cervix (HeLa) origin. Also, cytotoxicity was tested on human healthy bronchial epithelial (BEAS-2B) cells. In vitro experiments showed that plant extracts suppressed cell growth and proliferation at low concentrations by reducing cell viability on cancer cells in a time and concentration-dependent manner. It was observed that Angelica sylvestris was more effective in HT-29 and HeLa cells and Delphinium staphisagria in A549 and MCF-7 cells by suppressing cell proliferation and increasing cell death. Cell death mode (apoptosis/necrosis) was investigated via fluorescent imaging, caspase-cleaved cytokeratin 18, activated caspase-3, and cleaved-PARP (poly (ADP-ribose) polymerase). In order to evaluate the cell death mode by plant extracts apoptotic markers were investigated by fluorescence staining. Delphinium staphisagria extract (50-200 μg/mL) caused a decrease in cell density in A549 and MCF-7 cells compared to untreated controls. A similar situation was observed in HT-29 and HeLa cell lines when treated with ASE. As a result, Delphinium staphisagria extracts induced apoptosis in A549 and MCF-7, while Angelica sylvestris extracts induced apoptosis in HT-29 and HeLa cancer cellsArticle Citation - WoS: 25Citation - Scopus: 23Synthesis and Characterization of Aicar and Dox Conjugated Multifunctional Nanoparticles as a Platform for Synergistic Inhibition of Cancer Cell Growth(American Chemical Society, 2016) Dağlıoğlu, Cenk; Okutucu, BurcuThe success of cancer treatment depends on the response to chemotherapeutic agents. However, malignancies often acquire resistance to drugs if they are used frequently. Combination therapy involving both a chemotherapeutic agent and molecularly targeted therapy may have the ability to retain and enhance therapeutic efficacy. Here, we addressed this issue by examining the efficacy of a novel therapeutic strategy that combines AICAR and DOX within a multifunctional platform. In this context, we reported the bottom-up synthesis of Fe3O4@SiO2(FITC)-FA/AICAR/DOX multifunctional nanoparticles aiming to neutralize survivin (BIRC5) to potentiate the efficacy of DOX against chemoresistance. The structure of nanoparticles was characterized by dynamic light scattering (DLS), zeta-potential measurement, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and electron microscopy (SEM and STEM with EDX) techniques. Cellular uptake and cytotoxicity experiments demonstrated preferentially targeted delivery of nanoparticles and an efficient reduction of cancer cell viability in five different tumor-derived cell lines (A549, HCT-116, HeLa, Jurkat, and MIA PaCa-2). These results indicate that the multifunctional nanoparticle system possesses high inhibitory drug association and sustained cytotoxic effect with good biocompatibility. This novel approach which combines AICAR and DOX within a single platform might be promising as an antitumor treatment for cancer.Article Citation - WoS: 23Citation - Scopus: 24Proteasome Inhibitor Bortezomib Increases Radiation Sensitivity in Androgen Independent Human Prostate Cancer Cells(Elsevier Ltd., 2010) Göktaş, Serdar; Baran, Yusuf; Ural, Ali Uğur; Yazıcı, Sertaç; Aydur, Emin; Başal, Şeref; Avcu, Ferit; Pekel, Aysel; Dirican, Bahar; Beyzadeoğlu, MuratObjectives: To investigate the effects of a strong proteasome inhibitor, bortezomib alone or in combination with radiotherapy on androgen-independent DU145 human prostate cancer cells. Proteasomes play important roles in cell cycle, proliferation, apoptosis, angiogenesis, and cellular resistance to chemotherapy and radiotherapy. Methods: Increasing concentrations of bortezomib alone or in combination with radiation were applied to DU145 cells and IC50 values that inhibited cell growth by 50% were determined by 3-(4,5-dimethylthiazol-2-yl)-2,5 diphenyltetrazolium-bromide assay. Apoptosis was determined using annexin V staining by flow cytometry. mRNA levels of proapoptotic caspase-3 and antiapoptotic Bcl-2 genes were examined by reverse transcriptase polymerase chain reaction. Results: The IC50 value of bortezomib was found to be 28 μm although 400- and 800-cGy radiation decreased the cell proliferation by 14% and 28%, respectively. In 400- and 800-cGy radiation applied DU145 cells, IC50 value of bortezomib decreased to 23- and 12 μm, respectively. Exposure to 5 μm bortezomib for 48 hours caused apoptosis in 35% of the population whereas 800-cGy radiation resulted apoptosis in 14% of cells. However, 42% of DU145 cells that were exposed to 800 cGy and 5 μm bortezomib underwent apoptosis. Reverse transcriptase polymerase chain reaction results showed a significant decrease in mRNA levels of antiapoptotic Bcl-2 gene and an increase in proapoptotic caspase-3 gene expression in the combination group compared to control group. Conclusions: Bortezomib increases radiation sensitivity in androgen-independent human DU145 prostate cancer cells through inhibition of Bcl-2 and induction of caspase-3 genes. © 2010 Elsevier Inc. All rights reserved.