Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis The Effects of Calcium on Nf-Κb Pathway in Hacat Cells Containing Connexin26 Kid Syndrome Mutations(01. Izmir Institute of Technology, 2023) Yaşarbaş, Sümeyye Şüheda; Özçivici, Gülistan Meşe; 01. Izmir Institute of TechnologyKeratitis-ichthyosis-deafness (KID) syndrome is a rare genetic disorder characterized by deafness, corneal defects, and thickened, scaly skin and associated with mutations in Connexin26 (Cx26), resulting in the formation of hyperactive hemichannels that disrupt calcium (Ca2+) transfer. Ca2+ is crucial for normal epidermal cell function and may contribute to characteristics of KID syndrome. While unregulated Ca2+ transfer through aberrant Cx26 hemichannels is known to impact keratinocyte proliferation and differentiation, the specific mechanisms remained unclear. An increase in the molecules associated with the nuclear factor-κB (NF-κB) signaling pathway was observed in the D50Y mutation of KID syndrome. This suggests that Cx26 mutant channels may disrupt keratinocyte physiology through NF-κB signaling. Our study hypothesizes that Ca2+ signals altered due to Cx26 mutations affect the NF-κB pathway, potentially contributing to KID syndrome by modifying keratinocyte cell physiology. Our study showed that NF-κB activation significantly increased in D50Y cells, linked to hyperproliferation and activation was dependent on intracellular Ca2+. This was associated with increased p65 activation and nuclear localization due to hyperactive Cx26 channels in D50Y cells. These findings reveal a direct link between aberrant Ca2+ transport through Cx26 channels due to the D50Y mutation and NF-κB activation, shedding light on the hyperproliferative characteristics of Cx26 D50Y KID syndrome. Our goal was to understand how Ca2+ mechanisms impact the NF-κB pathway, potentially altering the physiology of keratinocytes expressing D50Y and G45E mutations. This research offers insights into the potential targeting of the NF-κB pathway for treating KID syndrome caused by Cx26 mutations.Master Thesis Investigating the Function of Cx26-I30n and D50y Mutations in Squamous Cell Carcinoma Cell Line Scc-25(01. Izmir Institute of Technology, 2021) Yavuz, Büşra; Meşe Özçivici, Gülistan; Meşe Özçivici, Gülistan; 01. Izmir Institute of Technology; 04.03. Department of Molecular Biology and Genetics; 04. Faculty of ScienceGap junctions are responsible for cell homeostasis and provide cell-cell and cell-ECM communications in multicellular organisms. Gap junction hemichannels consist of connexin (Cx) proteins which functions are crucial for human physiology. Moreover, Cx mutations are associated with various genetic diseases. For example, more than 10 missense mutations in the Cx26 gene cause keratitis-ichthyosis-deafness (KID) syndrome. Among these, Cx26-I30N and Cx26-D50Y cause to form abnormal hemichannels and allow excessive calcium influx into the cell. Furthermore, KID patients have higher squamous cell carcinoma (SCC) incidence and SCC is seen at an earlier age in these patients. Immunohistochemistry stainings have demonstrated aberrant E-cadherin and B-catenin spread in KID patients' samples. In this study, we aimed to effects of Cx26-I30N and Cx26-D50Y mutations associated with KID syndrome in human epithelial SCC cell line SCC-25. For this purpose, stable MSCV, Cx26-WT, Cx26-I30N and Cx26-D50Y cell lines were generated and RTqPCR, Western blotting, immunostaining and MTT assays were done for expression level, localization and viability analysis. For these 4 different cell conditions, a significant increase was detected at Cx26 mRNA levels, but not at protein levels. No difference was found in Cx43 level, which is abundant in epithelial tissue, and was localized in the perinuclear area like Cx26. Additionally, E-cadherin protein levels increased and their localization changed in parallel with the mutations from the perinuclear area to the plasma membrane. Moreover, significant decreases in viability were observed in cells grown in high extracellular Ca2+ medium compared to control in contrast to cells grown in Ca2+-free medium.