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  • 1
    Electronic Resource
    Electronic Resource
    Lymphomyeloid organs of the Antarctic fish Trematomus nicolai and Chionodraco hamatus (Teleostei: Notothenioidea): a comparative histological study (2000)
    Springer
    Polar biology 23 (2000), S. 321-328 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lymphomyeloid organs of two common species of Antarctic fish, Trematomus nicolai and Chionodraco hamatus, were studied with the aim of analysing some morphological aspects of these organs in relation to adaptation to low environmental temperature. The thymuses of T. nicolai and C. hamatus were flattened, incompletely lobated, with numerous Hassall-like bodies, which were mainly located in the central part of the organ in C. hamatus. In T. nicolai, thymocytes, erythroid and reticular epithelial cells filled the organ. In C. hamatus, the thymocytes intermingled with reticular epithelial cells were often close to groups of melano-macrophages. In both species, the thymus did not show distinct compartmentalisation; however, the thymocytes had significantly different sizes in the outer and inner portions of the thymus. The head kidney of both species was completely filled by haematopoietic tissue, highly vascularised and mainly lymphopoietic in T. nicolai, while both erythropoietic and lymphopoietic in C. hamatus. The spleen appeared mainly erythropoietic in T. nicolai and mainly lymphopoietic in C. hamatus. Solitary melano-macrophages in T. nicolai were close to numerous small vascular ellipsoids where erythroid and lymphoid cells were intermingled without the formation of red and white pulp areas. In C. hamatus, large lymphoid areas were organised around the capillaries. The possible adaptation of lymphoid organs to the low temperature of polar water is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050451
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of partial decerebration and hypophyseal allograft on differentiation of thymic epithelial cells in chick embryos: an ultrastructural study (1996)
    Springer
    Anatomy and embryology 193 (1996), S. 593-600 
    Details
    ISSN: 1432-0568
    Keywords: Thymus ; Thymic epithelium ; Hypophysectomy ; Hypophyseal graft ; Chick embryo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The thymus of 18-day-old normal-chick embryos, partially decerebrated chick embryos, and partially decerebrated embryos bearing hypophyseal allografts were analysed by light and transmission electron microscopy. The hypophyseal influence on the cytological differentiation of epithelial components has been studied. The thymus of partially decerebrated embryos showed a delayed differentiation of some types of epithelial cells and a marked decrease in number of lymphoid cells. Partially decerebrated embryos with hypophyseal implants showed a consistent recovery in the degree of differentiation of epithelial components. These findings indicate the influence of the hypophysis in establishing a correct environment for stromal cell differentiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00187931
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Histological observations on lymphomyeloid organs of the Antarctic fish Trematomus bernacchii (Teleostei: Nototheniidae) (1997)
    Springer
    Polar biology 18 (1997), S. 358-362 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lymphomyeloid organs of the Antarctic fish Trematomus bernacchii were studied with the aim of analysing some morphological aspects related to adaptation to low environmental temperature. The thymus of T. bernacchii was flattened, incompletely lobated and scarcely regionalised. It was filled by lymphoid elements intermingled with stromal elements. The head kidney appeared highly vascularised and mainly lymphopoietic. The spleen appeared mainly erythropoietic, with scarcely developed areas of white pulp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050200
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  • 4
    Electronic Resource
    Electronic Resource
    Immunocytochemical detection and cytomorphology of lymphocyte subpopulations in a teleost fish Dicentrarchus labrax (1997)
    Springer
    Cell & tissue research 289 (1997), S. 163-171 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Immunoelectron microscopy ; Monoclo- nal antibodies ; FACS ; Lymphocytes ; Fish ; Dicentrarchus labrax (Teleostei)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The monoclonal antibodies DLT15 and DLIg3 directed against thymocytes and serum immunoglobulins of the sea bass (Dicentrarchus labrax, L.) were used to study cells from the thymus, head kidney, spleen, gut-associated lymphoid tissue and peripheral blood leukocytes of this fish by immunofluorescence and pre-embedding immunoelectron microscopy. Immunofluorescence and flow cytometry of leukocyte fractions revealed a large number of DLT15-positive cells in the thymus (∼80%) and intestine (∼55%) and fewer cells in the spleen (∼7%), head kidney (∼6%) and peripheral blood (∼3%). DLT15-positive cells had two main morphologies, both detectable among thymocytes: a large round heterochromatic nucleus with light sparse cytoplasm (type a) and an irregular and heterocromatic nucleus with cytoplasm rich in polysomes and mitochondria (type b). Type b was most represented in spleen, head kidney, intestine and blood. We suggest that the type b morphology represents more differentiated lymphocytes. Flow cytometry revealed numerous DLIg3-positive cells in the head kidney (∼33%), spleen (∼30%) and peripheral blood leukocytes (∼21%) and fewer positive cells in the intestine (∼3%) and thymus (∼2%). DLIg3-positive cells had the morphology of lymphocytes (with a large round nucleus) or macrophages in all tissues. Plasma cells lacked membrane immunoreactivity. This is the first ultrastructural characterisation of putative T- and B-lymphocyte subpopulations in a fish species; these subpopulations are differentially distributed in teleost lymphoid organs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410050862
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    Paper (German National Licenses)
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