Cheuk Lai-Yee. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2001. / Includes bibliographical references (p. 153-184). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.

Chez les mammifères, IDO1, une enzyme induite dans les situations inflammatoires, joue des rôles multiples et complexes dans le cadre des réponses immunes innées et acquises. De façon intéressante, IDO1 est constitutivement exprimée par l’épithélium épididymaire où il est envisagé qu’elle participe à l’installation d’une situation d’immunotoloréance vis à vis des spermatozoïdes lesquels constituent un « challenge »immunologique pour le mâle qui les fabrique. Afin d’aborder le(les) rôle(s) joué(s) parIDO1 et ses produits d’activité (ie. les kynurénines) dans la physiologie de l’épididyme et, plus largement, dans la fonction de reproduction, le travail présenté dans ce manuscrit décrit les résultats acquis sur le modèle murin Ido1-/-en termes de phénotypes épididymaires, spermatiques ainsi qu’en terme d’impact sur la fertilité des animaux KO. Les données présentées suggèrent qu’IDO1 est effectivement un acteur immunosuppresseur dans l’épithélium épididymaire contribuant au privilège immunaccordé par ce territoire aux gamètes mâles. L’absence d’IDO1 génère au sein de l’épididyme des perturbations d’ordre inflammatoire néanmoins corrigées par diverses réponses qui préservent l’équilibre immun et fonctionnel du tissu. Ce travail met en outre en évidence que certaines kynurénines sont particulièrement représentées dans l’épididyme et au niveau des gamètes mâles où elles pourraient jouer des rôles variés. / In mammals, IDO1 is induced in inflammatory situations and plays multiple and complicated roles in the modulation of both innate and adaptative immune responses. Interestingly, IDO1 is constitutively expressed by the epididymal epithelium where it is envisaged that it participates in the set up of an immunotolerant environment in order to down-regulate auto immune-responses against spermatozoa. To decipher the roles played by IDO1 in the physiology of the epididymis and consequently in the male reproductive function, we show in this thesis report data obtained on the IDO1 knock-out mouse model. Data collected suggest that indeed IDO1 is an immunomodulatory player in the epididymis epithelium where it contributes to the immunotolerogenic context towards spermatozoa. When absent (ie. in the Ido1-/- genetic background) it specifically increases epididymal inflammation and triggers various tissue responses that aim at restoring the immune equlibrium. In addition, the work presented here shows that some kynurenines are particularly well represented in the epididymal epithelium as well as on spermatozoa where they could play important roles.

Orientador: José Antonio Dell'Áqua Junior / Banca: Fabiana Ferreira de Souza / Banca: André Maciel Crespilho / Resumo: Muitas biotecnologias estão sendo desenvolvidas visando a conservação do material genético de garanhões de alto valor zootécnico. Dentre estas pode-se destacar a colheita de espermatozoides do epidídimo de animais que sofreram algum trauma ou enfermidade que impossibilitem a colheita do sêmen, óbito ou eutanásia. Porém essas células espermáticas não entram em contato com o plasma seminal, importante por conter proteínas que participam de processos relacionados à proteção e ligação dos espermatozoides aos reservatórios espermáticos na tuba uterina. Neste sentido, sugere-se que haja importantes alterações bioquímicas nas células espermáticas do epidídimo, objetivando-se assim com esta revisão, estudar as principais diferenças morfofuncionais entre os espermatozoides provenientes do epidídimo e do ejaculado / Abstract: Several biotechnologies are being developed aiming genetic material conservation of stallions with high zootechnical value, as we can highlight the harvest epididymis's sperm of animals who suffered trauma or illness that makes impossible the semen collection, death or euthanasia. However these sperm cells do not get in touch with seminal plasma, important whereas it has proteins that participate in processes related to the protection and binding of sperm to the sperm reservoir in the oviduct. In this sense, it suggests that there is significant biochemical changes in epididymal sperm, aiming with this review to study the main morphological and functional differences between the sperm from the epididymis and ejaculated / Mestre

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Thesis--M. Phil., University of Hong Kong, 1980.

Thesis (Ph. D.)--University of Hong Kong, 1984.

Thesis (M.Sc. in Physiology) -- Faculty of Graduate Studies, Mahidol University, 1979. / Financial support by National Research Council.