Master Degree / Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/11147/3008

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Language: search.filters.language.enSubject: search.filters.subject.Cell proliferation

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Now showing 1 - 3 of 3
  • Master Thesis
    The Investigation of the Role of Nf-Κb in the Proliferation and Differentiation of Hacat Cells Containing Cx26 Kid Syndrome Mutations
    (01. Izmir Institute of Technology, 2024) İnal, Ece; Özçivici, Gülistan Meşe
    Keratit-iktiyozis-sağırlık (KID) sendromu, Connexin26 (Cx26) mutasyonlarından kaynaklanan, sağırlık ve görme bozukluklarının yanı sıra palmoplantar keratoderma (avuç içi ve ayak tabanlarında epidermisin kalınlaşması) ile karakterize edilen nadir bir genetik hastalıktır. Cx26 mutasyonları, hücre zarında kontrolsüz molekül geçişine neden olan sürekli açık, hiperaktif yarım kanalların oluşumuna yol açar. Bu durum keratinositlerin proliferasyonu ve farklılaşmasını etkilese de, Cx26 mutasyonlarından kaynaklanan epidermal değişikliklerin altında yatan mekanizmalar henüz bilinmemektedir. Proteomik çalışmalar, Cx26-D50Y KID sendromu mutasyonu içeren HaCaT keratinosit hücre hattında NF-κB sinyal yolağı proteinlerinde zenginleşme olduğunu göstermiştir. Bu nedenle, Cx26 mutant kanallarının NF-κB yolağı aracılığıyla keratinosit proliferasyon ve farklılaşma mekanizmalarını etkileyerek epidermal bozukluklara yol açabileceği hipotez edildi. Hastalarda farklı şiddetlere neden olan Cx26-G45E and Cx26-D50Y mutasyonlarını sürekli olarak ifade eden HaCaT hücrelerinin proliferasyon ve farklılaşma mekanizmaları üzerinde NF-κB sinyal yolağının rolünü araştırdık. G45E ve D50Y hücreleri sırasıyla çekirdekte bulunan en yüksek RelA ve c-Rel sinyallerini gösterdi. Ek olarak, NaSal muamelesi D50Y hücrelerinde erken ve geç apoptoz oranlarını farklı şekilde etkiledi. Dahası, erken ve geç apoptoz oranları karşılaştırıldığında G45E ve D50Y hücreleri ters yönde bir trend gösterdi. Ayrıca, NF-κB inhibisyonu, G45E hücrelerinin proliferasyon oranını azalttı. Son olarak, NaSal muamelesinden sonra G45E hücrelerinde cytokeratin10 protein seviyelerinde farklılıklar görüldü. G45E ve D50Y'de NF-κB, apoptozu farklı mekanizmalarla etkileyebilir ve D50Y'nin apoptoz mekanizmaları üzerinde farklı etkiler gösteriyor olabilir. Ayrıca, NF-κB, G45E'nin proliferasyon ve farklılaşma mekanizmalarını düzenliyor olabilir. KID sendromu için mevcut bir tedavi bulunmamaktadır. Bu nedenle, bu çalışma KID sendromunun moleküler ve hücresel mekanizmalarını anlamak açısından önemlidir.
  • Master Thesis
    Investigation of the Interaction Between Dr5-As Long Noncoding Rna and Caprin1 Protein
    (Izmir Institute of Technology, 2022) Kaçar, Vahide İlayda; Akgül, Bünyamin
    Cell proliferation is the crucial process for many physiological incidents such as tissue and organ development, wound healing, and immune system reactions. It is achieved by the growth and division of cells in a multicellular organism. Investigation of molecules involved in the regulation of cell cycle mechanism provides insight into reasons and treatments of the diseases such as cancer. In recent years, information that acquired from deep sequencing reveals that several proteins and non-coding RNAs have crucial role in the regulation of cell cycle and proliferation. Death receptor 5 antisense (DR5-AS) is a novel long non-coding RNA (lncRNA) transcript that is cisplatin inducible and is involved in modulation of cell proliferation and cell cycle in HeLa cells. When DR5-AS lncRNA was knocked down, the morphology of HeLa cells became spherical without inducing apoptosis. Although this lncRNA reduces cell proliferation via a cell cycle arrest at S and G2/M phases, mechanism behind this cell cycle arrest is not known. lncRNAs work in complexes with RNA, DNA, and protein interactions in the cell. There are several experimental and bioinformatical approaches to investigate RNA: protein interactions such as PAR-CLIP. In this approach, proximal protein and RNAs are covalently bonded with UV radiation. Then this complex is immunoprecipitated with specific antibodies. According to PAR-CLIP data of DR5-AS lncRNA, CAPRIN1 is a cell cycle associated protein that has the highest interaction score. The results suggest that CAPRIN1 and DR5-AS work reversely in cell proliferation although under the cisplatin treatment, CAPRIN1 enhances the expression of DR5-AS lncRNA. All these observations were confirmed by many quantitative experiments. Conclusively, this study provides a clue about how DR5-AS lncRNA might regulate cell cycle and proliferation through CAPRIN1 protein.
  • Master Thesis
    Investigation of the Effect of Dr5-As Long Non-Coding Rna on Cell Proliferation
    (Izmir Institute of Technology, 2020) Gürer, Dilek Cansu; Akgül, Bünyamin
    Cell proliferation is the process of increasing cell number in a multicellular organism. In literature, there are numerous proteins and non-coding RNAs reported as regulators of cell proliferation, yet, many of others are waiting to be explored. Unravelling the mechanism behind the regulation of cell proliferation is crucial to develop new strategies for fighting numerous diseases such as cancer, immune diseases, or neurodegenerative diseases. Long non-coding RNAs (lncRNAs) are known to regulate various cellular processes. To determine which ones are related to cell proliferation and apoptosis in HeLa cells, a transcriptomics study was performed under cisplatin, doxorubicin, TNF-? and Anti-Fas treatments. DR5-AS is a novel lncRNA transcript selected from this transcriptomics study as a promising regulatory lncRNA candidate due to its overlap with DR5 protein-coding gene which is known to regulate apoptosis and proliferation. Several phenotypic characterization methods were performed to understand the function of DR5-AS lncRNA. These studies showed that DR5-AS knockdown causes a significant decrease in cell proliferation, an alteration in the normal HeLa cell morphology, a shift through S and G2/M phases in cell cycle profile, and significant accumulation of cells in the metaphase phase. A second transcriptomics study was performed with DR5-AS knockdown HeLa cells to uncover which pathways are responsible for these changes. The results suggest that DR5-AS lncRNA regulates expression of numerous key proteins in cell cycle regulation. This observation was confirmed by several qPCR experiments. In conclusion, this study provides the first evidence that DR5-AS lncRNA modulates cell cycle and proliferation in HeLa cells.