Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Identification of Neuroinflammatory Markers in a Mouse Model With a Deficiency of Neu1(01. Izmir Institute of Technology, 2024) Seyrantepe, Volkan; Ada, Ebru; Seyrantepe, VolkanLysosomal neuraminidase 1 is responsible for sialic acid removal from oligosaccharides and glycoconjugates. Neu1 sialidase forms enzyme complex with protective protein cathepsin A, and glycosidase β-galactosidase. Mutations in Neu1 sialidase cause sialidosis, and Neu1-/- mice show symptoms of sialidosis patients. GM3 ganglioside is defined as substrate of lysosomal sialidase in vitro, and marked increase in GM3, GD3, and GM4 ganglioside levels in brain, spleen and liver autopsy tissues of sialidosis patients. Additionally, it was monitored that Neu1 has regulatory roles in immune response; expression of interleukins, activation of Toll-like receptor, and production of NF-kB in immune cells. However, relationship between inflammatory pathways and secondary lipid metabolisms in Neu1 sialidase deficiency remains unclear. Here, we aimed to investigate secondary lipid alterations and inflammatory response in tissues of Neu1-/- mice. In this study, lipidomic, molecular, histological and immunohistochemical analyses were performed in brain, spleen and kidney tissues of 2- and 5-month-old Neu1-/- mice. Decreasing levels of secondary lipids (phosphotidylcholine, phosphatidylethanolamine, and phosphotidylinositol) and elevated levels of pro-inflammatory cytokines, glycoconjugate accumulations, morphological degenerations, oligodendrocyte and neuronal loss, astrogliosis, and microgliosis were observed in brain, spleen and kidney of 2- and 5-month-old Neu1-/- mice. In the light of our findings, reduced levels of glycerophospholipids may be considered as biomarkers of activated inflammatory response in Type II sialidosis mice model. In the future studies, novel therapeutic strategies can target these altered glycerophospholipids, and their regulation can be crucial for alleviation of pathogenesis in sialidosis patients.Master Thesis Investigation of Combined Biological Roles of Neuraminidase 1 and Gd3 Synthase Enzymes in Glycolipid Metabolism(Izmir Institute of Technology, 2020) Dağalp, Berkay; Seyrantepe, VolkanNeuraminidases or sialidases are classified enzymes hydrolases the sialic acid residues from the glycoconjugates. In vertebrates, so far four different neuraminidases have been identified having distinct roles besides degradation of glycoconjugates. Neuraminidases differ in subcellular locations where Neuraminidase 1 is mainly localized in lysosomes having crucial regulatory roles and forms a multienzyme complex with protective protein/cathepsin A and ß-galactosidase. Only Neu1 is recognized when its functions or a component from the complex they together forged are defected, resulting two severe lysosomal storage disorders, sialidosis and galactosialidosis. To shed light on these disorders, Neu1-/- mice model lacking the enzyme was generated. By addition of sialic acid residue to the structure of Glycosphingolipids (GSLs), complex sugars in the membrane surface that provide special properties to cell, gangliosides are generated that further processed into 0-, a-, -b, -c series. Since the function of Neu1 in Glycosphingolipid pathway is unclear, to investigate the role of Neu1in this pathway, Neu1-/- mice crossed with the mice lacking b-and c- series of gangliosides, the GD3S-/- mice are used to generate Neu1-/-GD3S-/- mice. Even though mice showed indifferent ganglioside profile with a thin layer chromatography, they displayed decreased apoptotic signals and ER-stress markers with RT-PCR. However, western blotting and immunohistochemical studies revealed severe cell death in the brain. Moreover severe behavioral deficits were observed with open field and rotarod tests. The effects of b- and c- series of gangliosides on double knock-out mice still require further research that might reveal important roles in terms of cell death mechanism