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Structure and function of dendritic cells in the lymphoid tissue of the domestic fowl
Başlık:
Structure and function of dendritic cells in the lymphoid tissue of the domestic fowl
Yazar:
Wallace, Lesley Elizabeth, author.
ISBN:
9780438059108
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (232 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 76-08C.
Advisors: R. G. White.
Özet:
The dendritic cell involved in the localisation of protein antigens to the germinal centres of the spleen of the domestic fowl has been studied, and it is proposed that the dendritic cell has a key role in the regulation of the immune response by virtue of its ability to retain antigen-antibody complexes on its surface. Ultrastructural autoradiography detected antigen-bearing cells in the white pulp of the spleen, and cells with similar morphology were also found within the germinal centres of the spleen and caecal tonsils. These cells were characteristically elongated and irregular in shape and possessed long cytoplasmic processes which extended between the adjacent cells of the white pulp and germinal centres in the spleen. The cytoplasm of lymphocytes situated close to the dendritic cells was found to lack the endoplasmic reticulum characteristic of antibody-producing, and this observation has led to the proposal that the dendritic cells can prevent these lymphocytes from maturing into plasmacytes. The observation that the germinal centres found in the spleens of birds with a chronic Trypanosoma (Trypanozoon) brucei infection were greatly increased in size and number was interpreted as resulting from the persistance of trypanosome antigens during the course of the infection and to the possible emergence of new antigens on the coats of the organisms, thus supporting the hypothesis that germinal centres are formed in response to antigenic stimulation. The caecal tonsil, a site where numerous germinal centres are present was also studied and compared with the spleen. Although exhibiting many similar characteristics to the spleen, the caecal tonsil was found to have a limited ability to synthesise antibody in response to locally injected antigen, and could not be shown to localise that antigen to the surface of the dendritic cells present within these tissues.
Notlar:
School code: 0547
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(684687.1) | 684687-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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