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  • 1
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal of Morphology 173 (1982), S. 87-100 
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: In an attempt to determine the role in the immune responses of the typhlosole, a hematopoietic tissue along the ventral wall of the larval lamprey Lampetra reissneri, scanning and transmission electron microscopic observations were made on ammocoetes hyperimmunized with sheep red blood cells. Besides including the cells of the erythrocyte series, this tissue also contained the following leucocytes forming an amorphous parenchyma: the cells of the granulocyte series, the most predominant cell type, possessing a markedly lobed nucleus and membrane-bounded granules of various sizes; the macrophages possessing primary and secondary lysosomes and long lamellipodia on the cell surface; the lymphocytes of a large nucleocytoplasmic ratio with a number of long, spiky microvilli, constituting a major type of rosette-forming (antigen-binding) cells; and the plasma cells possessing highly extended cisternae of rough endoplasmic reticula that are characteristic of the higher vertebrates. The immunoperoxidase technique, which employs rabbit antibodies against lamprey immunoglobulin, proved that these plasma cells do contain immunoglobulin. These results strongly indicate that the typhlosole of the larval lamprey, besides functioning as a hematopoietic tissue, is actively involved in the antibody responses. It is also stressed that the plasma cell occurs in the most primitive vertebrates as an immunologically competent cell.
    Zusätzliches Material: 21 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 231 (1983), S. 301-312 
    ISSN: 1432-0878
    Schlagwort(e): Ammocoete ; Allograft rejection ; Granulocytes ; Plasma cell ; Phagocytosis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The rejection of skin allografts by the larval lamprey, Lampetra reissneri, was studied by light and electron-microscopy, with particular attention to the cell types involved in the reaction. In all allografts, melanophores were destroyed within 20–60 days (the mean survival time, 36±12 days). Neither the epidermis nor the underlying collagenous lamella was invaded by host cells until the 60th day. A heavy infiltration of host leucocytes was observed in the allografts in melanophore and adipose layers and in the bundles of muscles. Throughout all stages from 10 to 60 days after the grafting, the cells of the polymorphonuclear leucocyte (PMN) series and eosinophilic granulocytes predominated, but macrophages were not observed at any stages examined. Plasma cells occurred occasionally at later stages (40–60 days) of allograft rejection, but lymphocytes were rarely found at any stages of graft rejection. These observations, combined with the recent finding of the antibody-enhanced phagocytic activity of granulocyte-series cells in the lamprey, indicate that PMNs, but not lymphocytes, function as the major effector cells in allograft rejection in this phylogenetically oldest class of contemporary vertebrates.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 219 (1981), S. 41-51 
    ISSN: 1432-0878
    Schlagwort(e): Lamprey ; Polymorphonuclear leucocyte ; Phagocytosis ; Invitro ; Studies ; Opsonin
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Centrifugation on Ficoll-Paque of the blood from the Arctic lamprey, Lampetra japonica, yielded a uniform population of leucocytes containing about 90% polymorphonuclear leucocytes (PMNs). The PMNs showed a significantly enhanced phagocytic activity in vitro against sheep erythrocytes (ES), provided they were opsonized with the specific lamprey antibody (AL) against ES. This enhanced phagocytosis by PMN was more active at 4° C than 15° C, being dependent on Ca++; the opsonic activity of lamprey antibody was not replaced by bullfrog antibody. By the use of electron microscopy, it was found that the PMNs possess a well developed Golgi complex and rough ER, as well as highly variable cytoplasmic granules. Observations by both SEM and TEM revealed the formation of prominent pseudopodia, lamellipodia and phagosomes by the PMN during the process of engulfing erythrocytes.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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