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  • Gut-associated lymphoid tissue (GALT)  (2)
  • Hagfish, Myxine glutinosa L. (Agnatha)  (1)
  • Springer  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Occluding junctions in the epithelia of the gut-associated lymphoid tissue (GALT) of the rabbit ileum and caecum (1991)
    Springer
    Cell & tissue research 266 (1991), S. 301-314 
    Details
    ISSN: 1432-0878
    Keywords: Gut-associated lymphoid tissue (GALT) ; Peyer's patches ; Appendix ; M-cell ; Occluding junctions ; Rabbit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The zonulae occludentes of the dome epithelia and adjacent non-dome epithelia in four locations of the gut-associated lymphoid tissue (GALT) in the rabbit ileum and caecum (Peyer's patches, sacculus rotundus, caecal lymphoid patches, appendix) were studied in freeze-fracture replicas. In all locations the zonulae occludentes of the dome epithelium are composed of more junctional strands than in the corresponding non-dome epithelium. In the dome epithelia of Peyer's and caecal lymphoid patches the zonulae occludentes show considerable structural variation; the number of superimposed strands is ∼10 (range 5–18). In the dome epithelia of sacculus rotundus and appendix, in addition to zonulae occludentes, extended networks of junctional strands (fasciae occludentes) are present particularly between M-cells and enterocytes. The zonulae occludentes consist of ∼8 to 9 (range 5–15) superimposed strands; the fasciae occludentes extend up to a depth of 20μm on the lateral membranes. The presence of the fasciae occludentes correlates with the appearance of regularly shaped clusters of lymphocytes, which are most developed in the dome epithelia of sacculus rotundus and appendix. These results suggest (1) that in contrast to the dome epithelia of Peyer's and caecal lymphoid patches those of sacculus rotundus and appendix are compartmentalized, and (2) that the mobility of lymphocytes and diffusion of antigens in the dome epithelia of sacculus rotundus and appendix is restricted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318186
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  • 2
    Electronic Resource
    Electronic Resource
    Co-localization of vimentin and cytokeratins in M-cells of rabbit gut-associated lymphoid tissue (GALT) (1992)
    Springer
    Cell & tissue research 269 (1992), S. 331-340 
    Details
    ISSN: 1432-0878
    Keywords: M-cells ; Vimentin ; Cytokeratins ; Peyer's patches ; Appendix ; Gut-associated lymphoid tissue (GALT) ; Rabbit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The occurrence of cytokeratins, vimentin, and desmin in the dome epithelia and adjacent non-dome epithelia in four locations of gut-associated lymphoid tissues (GALT) of adult and newborn rabbits (Peyer's patches, sacculus rotundus, caecal lymphoid patches and appendix) was studied with monoclonal antibodies, using the indirect immunoperoxidase technique. In all locations investigated in adult animals, antibodies specific for vimentin labelled (1) M-cells, which engulf intraepithelial lymphocytes, (2) columnar epithelial cells at the base of the domes lacking an apparent contact with lymphocytes (“immature” M-cells), and (3) flat cells, which lie in the lamina propria under the dome epithelium, and which line the basal lamina with thin cytoplasmic processes. In newborn rabbits, columnar epithelial cells resembling the immature M-cells of adults were selectively stained with vimentin antibodies. In M-cells, the strongest immunoreactivity was present in the perinuclear region and close to the pocket membrane, whereas the most apical and most basal parts of the cytoplasm showed no vimentin-immunoreactivity. Enterocytes in the dome epithelium and in the non-dome epithelium were vimentin-negative. M-cells and enterocytes bound antibodies against cytokeratin peptides 18 and 19 in adults and newborn animals. Compared with enterocytes, M-cells showed less intense staining for cytokeratins. Dome epithelia and no-dome epithelia did not contain desmin-immunoreactive cells. The results suggest that vimentin is a sensitive marker for M-cells in rabbit GALT.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319625
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  • 3
    Electronic Resource
    Electronic Resource
    Intercellular junctions in the gill epithelium of the Atlantic hagfish, Myxine glutinosa (1988)
    Springer
    Cell & tissue research 254 (1988), S. 573-583 
    Details
    ISSN: 1432-0878
    Keywords: Gill epithelium ; Mitochondria-rich cells ; Intercellular junctions ; Freeze-fracture ; Hagfish, Myxine glutinosa L. (Agnatha)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The intramembrane organization of the occluding junctions in the gill epithelium of the Atlantic hagfish, Myxine glutinosa, was studied by means of freeze-fracture electron microscopy. Mitochondria-rich cells, characterized by assemblies of rod-shaped particles in the luminal plasma membrane and by an extensive intracellular amplification of the basolateral plasma membrane, are singly distributed between the pavement cells in the gill epithelium of this marine and stenohaline cyclostome. The occluding junctions between mitochondria-rich cells and pavement cells do not differ from those between adjacent pavement cells, concerning the number of superimposed strands (median 6, range 4–9) and their geometrical organization. These observations suggest that, in contrast to marine teleosts, the paracellular pathway plays a minor role in transepithelial ion movements in the hagfish gill epithelium. The findings are in agreement with the absence of hypoosmoregulatory mechanisms in hagfish, as have been evolved in various marine vertebrates. In addition, small communicating junctions are demonstrated between pavement cells; they possibly serve for a coordinated synthesis and secretion of mucus by the pavement cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226507
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