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The characterisation of sperm and seminal plasma glycoproteins: Their role within the tetraspanin network and male fertility
Páleníková, Veronika
Mgr. Veronika Páleníková only to describe the localization and heterodimerization of α3, α6, αV, β1, and β4 integrins in mentioned integrins. Importantly, we detected the presence of integrin β4 subunit in mouse sperm, and characterised that it forms functional heterodimer with α6 subunit. In tion, we described α6β1 and α3β1integrin pairs, which contribute to the integrity and complexity of sperm membranes. Moreover, we found that α6 integrin subunit interacts with proposed CD9 and CD81 as tetraspanin partners for αV integrin in tetraspanin web. Our goal
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The characterisation of sperm and seminal plasma glycoproteins: Their role within the tetraspanin network and male fertility
Páleníková, Veronika ; Postlerová, Pavla (advisor) ; Ryšlavá, Helena (referee) ; Pěknicová, Jana (referee)
Mgr. Veronika Páleníková only to describe the localization and heterodimerization of α3, α6, αV, β1, and β4 integrins in mentioned integrins. Importantly, we detected the presence of integrin β4 subunit in mouse sperm, and characterised that it forms functional heterodimer with α6 subunit. In tion, we described α6β1 and α3β1integrin pairs, which contribute to the integrity and complexity of sperm membranes. Moreover, we found that α6 integrin subunit interacts with proposed CD9 and CD81 as tetraspanin partners for αV integrin in tetraspanin web. Our goal
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Glycoprotein profile of human ejaculate as a marker of its quality
Pavlová, Hana ; Postlerová, Pavla (advisor) ; Krejčová, Tereza (referee)
Glycoproteins are an indispensable component of the sperm glycocalyx. They arise through the process of co-translational or post-translational modification, so-called glycosylation, during which carbohydrate chains are attached to a peptide chain. Glycoproteins are involved in reproductive processes and their presence is often key to successful fertilization. The degree of glycosylation of glycoproteins is highly variable and is determined by the representation of carbohydrate units in glycans. It has already been found that the degree of glycosylation can be related to the fertility of an individual. The diploma thesis is focused on the comparison of the representation of terminal saccharides, sialic acid and fucose, in the glycoproteins of sperm and seminal plasma of patients with normal and abnormal ejaculate parameters. The total rate of sialylation and fucosylation in the seminal plasma was determined, as well as the rate of sialylation and fucosylation of specifically detected glycoproteins of sperm and seminal plasma. A significant difference was noted only in the detection of total fucosylation of seminal plasma glycoproteins. However, subsequent correlation tests revealed important relationship between the degree of sialylation and fucosylation of glycoproteins and ejaculate parameters,...
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Sialic acid as a recognition motif for host-originated glycoproteins in Ixodes ricinus
SAMEK, Jakob
Glycans are found on the surface of every living cell and they are responsible for a countless number of functions. N-acetylneuraminic acid (often called sialic acid) is mostly found in vertebrate and only to a small degree in arthropods. The aim of this thesis was to find out if sialic acid is a recognition motif for the tick organism to take up and incorporate or recycle host originated proteins.
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Význam sialovaných glykoproteinů pro klíště \kur{Ixodes ricinus}
ONDRUŠ, Jaroslav
Sialic acid is a highly abundant and a common component of vertebrate glycans, where it can be found in the terminal positions of the cell surface glycoconjugates. The amount of sialylated glycoconjugates as well as their complexity vary between both different species and different tissue types within one individual. Considering the vertebrates, these well studied structures are know to be important for cell-cell interactions, cell adhesion and immunity. In contrary, sialic acid in arthropod glycans has been identified only in a limited number of species. In obligatory blood feeding parasites such as ticks, distinguishing between sialylated glycoproteins of tick and host origin is challenging due to huge volumes of ingested blood containing heavily sialylated structures of host origin. In the tick Ixodes ricinus, the presence of minor amount of tick´s sialylated structures has been shown previously in the ovaries and salivary glands, however, their role remains completely unknown. In this thesis, we study the importance and role of both the tick-originating and the host sialylated glycoproteins for I. ricinus, the tick commonly found in Czech Republic. We show that the tick-originating sialylated glycoproteins are present in I. ricinus eggs, and that their amount changes over time after laying the eggs. Furthermore, these molecules were localized in cryosections of 14 days old eggs and in the larvae using confocal microscopy. In addition, we shed some further light on the role of sialic acid for ticks in the tick blood meal. According to our results, the glycan part of glycoproteins is the key in recognition of these molecules by tick cells.
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Determination of N-glycome of the tick \kur{Ixodes ricinus} and \kur{Dermacentor marginatus}; Analysis of N-glycans in tick tissues and their comparison
ŠIMONOVÁ, Zuzana
Glycosylation in vertebrates has a main role in many important processes such as cell transport, protein folding, secretion of proteins etc. What function has glycosylation in arthropods, for example in ticks, is rarely studied. This work was focused on analysis of N-glycans in tick tissues, namely in Ixodes ricinus and Dermacentor marginatus. High-mannose glycans as well as complex glycans with or without core-fucosylation were identified in this study.Furthermore several sialylated glycans were present in the studied samples. Sialic acid is found in arthropods rarely and this is the first study which directly proves its presence in ticks using mass spectrometry.
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