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  • 11
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    Implications of absence of seawater-type mitochondria-rich cells and results of molecular analyses for derivation of the non-parasitic Ukrainian brook lamprey Eudontomyzon mariae (2017)
    Springer
    Details
    Publication Date: 2017-01-31
    Print ISSN: 0378-1909
    Electronic ISSN: 1573-5133
    Topics: Biology
    Published by Springer
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  • 12
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    Focal adhesion kinase regulates the activity of the osmosensitive transcription factor TonEBP/NFAT5 under hypertonic conditions (2014)
    Frontiers Media
    Details
    Publication Date: 2014-04-04
    Electronic ISSN: 1664-042X
    Topics: Biology
    Published by Frontiers Media
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  • 13
    Electronic Resource
    Electronic Resource
    Freeze-fracture study of the turtle lung (1984)
    Springer
    Cell & tissue research 236 (1984), S. 453-457 
    Details
    ISSN: 1432-0878
    Keywords: Lung ; Turtle, Pseudemys scripta (Chrysemys scripta) ; Freeze-fracture ; Rod-shaped particles ; Mitochondria-rich cell
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In thin sections of the lung of the fresh-water turtle Pseudemys (Chrysemys) scripta some pneumocytes can be distinguished from the remaining pulmonary epithelial cells by a larger amount of mitochondria. In these cells the typical features of type-I and type-II cells are absent. Freeze-fracture replicas reveal rod-shaped particles in the apical plasma membrane of a small population of pneumocytes, which by cytological criteria seem to be identical with the mitochondria-rich cells observed in thin sections. It is assumed that these cells represent a distinct type of pneumocytes in the turtle lung and that they are a member of the group of mitochondria-rich cells present in some ion-transporting epithelia. The function of these cells in this location remains to be determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00214249
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  • 14
    Electronic Resource
    Electronic Resource
    Intercellular junctions in the water-blood barrier of the gill lamella in the adult lamprey (Geotria australis, Lampetra fluviatilis) (1993)
    Springer
    Cell & tissue research 274 (1993), S. 521-532 
    Details
    ISSN: 1432-0878
    Keywords: Gill epithelium ; Pavement cells ; Pillar cells ; Zonulae occludentes ; Gap junctions ; Freeze-fracture ; Geotria australis, Lampetra fluviatilis (Cyclostomata)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Thin sections and freeze-fracture replicas of the water-blood barrier in the gill lamellae of adult lampreys (Geotria australis, Lampetra fluviatilis) demonstrate that the occluding junctions between epithelial pavement cells differ markedly from those between “endothelial” pillar cells in the structure and arrangement of their strands. The zonulae occludentes between pavement cells typically consist of complex networks of 4–6 strands, the mean number of which undergoes a small but significant decline when the animal is acclimated to seawater. In comparison, the occluding junctions between pillar cells are less elaborate and may represent maculae or fasciae, rather than zonulae occludentes. They do not apparently undergo a change when the animal enters saltwater. The results indicate that the main part of the paracellular diffusion barrier to proteins and ions is located in the epithelium rather than the endothelium. Communicating (gap) junctions are present between adjacent pavement cells, between pavement and basal cells and between pillar cells. These findings suggest that the epithelial cells and the pillar cells in the water-blood barrier of lampreys both form ‘functional syncytia’. The results are discussed in the context of ion-transporting epithelia in other aquatic vertebrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314549
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  • 15
    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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  • 16
    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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  • 17
    Electronic Resource
    Electronic Resource
    Orthogonal arrays of particles in the gill epithelium of the Atlantic hagfish, Myxine glutinosa (1984)
    Springer
    Cell & tissue research 238 (1984), S. 657-659 
    Details
    ISSN: 1432-0878
    Keywords: Gills ; Epithelial (pavement) cell ; Freeze-fracture ; Orthogonal arrays of particles ; Myxinoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Freeze-fracture replicas of hagfish gill epithelium revealed orthogonal arrays of 6-nm particles in the basolateral plasma membrane of pavement cells. The arrays consisted of 4–16 particles and occupied an area of 340±170 nm2. These particle arrays, which are considered to be sites of ionic leakage, possibly contribute to the regulation of the pericellular micromilieu of adjacent mitochondria-rich cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219886
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  • 18
    Electronic Resource
    Electronic Resource
    Myomuscular junctions in the gill-sac muscle of the Atlantic hagfish, Myxine glutinosa: analogy with myotendinous junctions (1986)
    Springer
    Cell & tissue research 246 (1986), S. 223-225 
    Details
    ISSN: 1432-0878
    Keywords: Myomuscular junction ; Myotendinous junction ; Sarcolemma ; Gill muscle ; Hagfish, Myxine glutinosa (cyclostomes)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Myomuscular junctions between muscle fibers in the gill sacs of the Atlantic hagfish, Myxine glutinosa, were examined by electron microscopy. According to the presence of sarcolemmal differentiations typical of myotendinous junctions, the myomuscular junctions can be described as a symmetric myotendinous junction
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219022
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  • 19
    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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  • 20
    Electronic Resource
    Electronic Resource
    Structural organization and epithelial cell types of the intestinal diverticula (protopancreas) of ammocoetes of southern hemisphere lampreys: functional and phylogenetic implications (1995)
    Springer
    Cell & tissue research 280 (1995), S. 313-324 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Intestinal diverticula ; Pancreas ; exocrine ; Zymogen cell ; Mucous cell ; Geotria australis ; Mordacia mordax (Cyclostomata)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Larvae of the two southern hemisphere lamprey genera, Mordacia and Geotria, possess one and two intestinal diverticula, respectively, each originating at the oesophageal-intestinal junction. These diverticula comprise an inner layer of simple columnar epithelium composed solely of zymogen and mucous cells, a middle layer consisting mainly of a blood sinus, and an outer serosa layer covered by a simple squamous epithelium (mesothelium). The inner surface is highly folded only in Mordacia. The secretion of mucus probably protects the epithelium from the effects of digestive enzymes secreted by the zymogen cells and/or bile, which enters the diverticulum at its tip. Unlike the situation in southern hemisphere lampreys, the zymogen cells of the larvae of holarctic lampreys are located in the anterior intestine, a condition considered to be ”primitive”. It is thus proposed that intestinal diverticula were developed during the evolution of southern hemisphere lampreys. The relocation of zymogen cells in the diverticula increases the area for these cells, and thus the capacity for the synthesis and secretion of digestive enzymes, particularly in Mordacia where the inner surface is folded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307804
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