Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Immobilization of Olive Leaf Extract on Chitosan Nanoparticles and Investigation of Their Effects on Cancer Cell Lines(Izmir Institute of Technology, 2014) Özdamar, Burcu; Şanlı Mohamed, Gülşah; Şanlı Mohamed, Gülşah; 04.01. Department of Chemistry; 04. Faculty of Science; 01. Izmir Institute of TechnologyCancer incidence and mortality rates are increasing worldwide in both economically developed and developing countries. Breast cancer in females and lung cancer in males are the most common cancer types. Epidemiological research has provided increasing evidence that dietary habits, especially Mediterranean diet which has high consumption of olive oil and its products, may play an important role in lung and breast cancer. Due to their preventive effect against cancer, olive leaf extract rich in polyphenols was immobilizied on chitosan nanoparticles which are good drug carriers because of their biocompatible and biodegradable properties with the help of capability of passing through biological barriers. For this aim, olive leaf extract loaded chitosan nanaoparticles were synthesized by ionotropic gelation mechanism. Optimum conditions to synthesize nanoparticles were determined by investigation of the effect of chitosan and tripolyphosphate mass ratio, initial pH of chitosan solution, concentration of olive leaf extract and incubation time of olive leaf extract and tripolyphosphate with chitosan solution. Characterization of nanoparticles was performed by dynamic light scattering, atomic force microscopy and infrared spectroscopy. To investigate the anticancer properties of nanoparticles, molecular biological studies were performed by in vitro cytotoxicity studies based on MTT assay, in vitro cell cycle analysis and apoptosis by flow cytometer and imaging of cells by optical microscopy. In results, olive leaf extract loaded chitosan nanaoparticles obtained approximately 91.25 nm and showed more cytotoxicity than chitosan nanoparticles, chitosan and olive leaf extract for both lung and breast cancer cells. In contrast, there was no cytotoxicity for healthy cells. These effects were supported by cell cycle analysis. Also in optical imaging, lower number of cells and morfological differences on cancerous cells which supports the cytotoxicity results were observed. We can conclude that our results will open a new approach to use not only cytotoxic anticancer drug for cancerous cells but also biocompatible material for biomedical applications.Master Thesis The Effect of Doxorubicin-Albumin Magnetic Nanoparticles on Prostate and Lung Cancer Cells(Izmir Institute of Technology, 2012) Zeybek, Ayça; Şanlı Mohamed, Gülşah; Şanlı Mohamed, Gülşah; 04.01. Department of Chemistry; 04. Faculty of Science; 01. Izmir Institute of TechnologyChemotherapy is a major therapeutic approach for treatment of a wide range of cancers. But unfortunately, this therapeutic approach has got a lot of side effects on healthy tissues as well as cancerous cells. Although doxorubicin is one of the most potent and widely used anticancer drugs, it has some side effects on healthy tissues, as well. Therefore, most researchers have studied various doxorubicin carrier systems for targeted delivery. For this purpose, doxorubicin loaded magnetic albumin nanospheres (M-DOX-BSA-NPs) were synthesized. The main objective of this project was basically to determine the cytotoxic, apoptotic and cell cycle effects of BSA-NPs, M-BSA-NPs, DOX, BSA-DOX-NPs and M-DOX-BSA-NPs against prostate and lung cancer cells and compare them. Beside this, it is aimed to understand how cells look like before and after giving doxorubicin and M-DOX-BSA-NPs by using optical microscopy and compare them. Another objective of this project was to determine where M-DOX-BSA-NPs reach out into the cell by using concofal microscopy; and to explore proteins’ differentiations between control groups and lung and prostate cancer cells in which DOX and M-DOX-BSA-NPs were applied, by proteomic studies. In this study, the experimental results which were also supported by literature findings, demonstrated that M-DOX-BSA-NPs were more toxic than free doxorubicin, and this complex was more effective for prostate cancer cells than lung cancer cells. As a result of this study, it was determined that this complex was synthesized as a target chemotherapy drug delivery system. Accordingly, this complex may affect to other cancer types, and it can be carried out by new drug designers and treatments.