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Humoral response of specific hosts to bird schistosome antigens
Turjanicová, Libuše ; Mikeš, Libor (advisor) ; Kolářová, Libuše (referee)
This thesis focuses on humoral immune response of specific hosts to antigens of various developmental stages of bird schistosomes T. regenti and T. szidati, and follows up on previous research of antibody response in non-specific hosts (mouse, human). Sera of experimentally infected and hunted-down wild ducks were examined using the ELISA and western blot methods. The sera samples were taken in predefined intervals. Results of the ELISA analysis show the process of humoral immune response after infection by bird schistosomes. The level of specific antibodies IgY against homogenate of T. regenti cercariae increased significantly 20 d.p.i. in ducks infected by T. regenti. Such reaction wasn't observed in ducks infected by T. szidati. Slight changes in level of specific antibodies IgM against T. szidati cercariae homogenate were observed 10 d.p.i. only in fully immunocompetent ducks and in reinfected ducks. Examination of hunted-down wild ducks didn't prove infection by bird schisosomes; this conclusion was confirmed by results of the ELISA analysis. IgY antibodies from ducks infected by T. regenti demonstrated strong reactions with 2 antigens in ranges 49-47 kDa and 47-45 kDa. Other reactions, which were recognized, have not been observed in all specimen. An Western blott with homogenate from 7 days...
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Glycocalyx shedding by cercariae of bird schistosomes
Chaloupecká, Jana ; Mikeš, Libor (advisor) ; Štěrba, Ján (referee)
Trichobilharzia spp. are avian schistosomes related to medically important human parasites of the genus Schistosoma. Penetrating cercariae are well known as causative agent of cercarial dermatitis in humans. Cercariae actively penetrate the skin of definitive hosts and transform into schistosomula. This process is preceded by cercarial tail detachment and includes emptying of penetration glands and extensive surface changes. One of these changes is the loss of highly immunogenic glycocalyx which represents a protective coat in the aquatic environment. The glycocalyx has specific composition of saccharide molecules which are bound to lipids or proteins on the membrane of cercarial tegument. There is only limited information about the mechanism of shedding. Hypotheses based on indirect evidences suggest that peptidases or (phospho)lipases from penetration glands could be involved. This work describes the changes in surface glycosylation during transformation of cercariae into schistosomula by fluorescently labelled lectins and monoclonal antibodies against Lewis X antigen. Lectins UEA-I, LTA and PNA have been chosen as markers of transformation of T. regenti. Further, our experiments have been focused on shedding of cercarial glycocalyx. During in vitro induction of penetration gland emptying and...
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