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  • 1
    Digitale Medien
    Digitale Medien
    The development of cell junctions during nephrogenesis (1981)
    Springer
    Anatomy and embryology 163 (1981), S. 307-319 
    Details
    ISSN: 1432-0568
    Schlagwort(e): Freeze-fracture ; Tight junctions ; Developing nephron ; Rabbit kidney ; Junction differentiation ; Nephrogenesis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The differentiation and distribution of intercellular junctions especially during the early developmental stages of the rabbit nephron was studied by freeze-fracture electron microscopy. Metanephrogenic cells were found to be connected by sporadic focal tight junctions. During the formation of the renal vesicle similar tight junctions occurred on the periphery as well as near the developing lumen. These focal tight junctions increased in size and coalesced to broad zonulae occludentes lining the vesicular lumen at a later stage. Broad occluding junctions were also observed in the different nephron segments of the S-shaped stage. Ultrastructurally, these early maculae and zonulae occludentes consisted of beaded rows of particles. As development progressed, continuous tight junctions formed, whereas the number of strands decreased with the exception of the distal tubule. In contrast to the parietal glomerular epithelium, the initial occluding zonules of the visceral glomerular cells were gradually reduced to maculae occludentes, and finally disappeared. These results suggest that zonulae occludentes appear synchronously with the establishing lumen; the ultrastructural differentiation of tight junction strands seems to be completed with the onset of glomerular filtration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00315707
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Gap junctions between pinealocytes (1981)
    Springer
    Cell & tissue research 218 (1981), S. 303-314 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Pineal gland ; Freeze-fracture ; Cell junctions ; Gap junction ; Tight junction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The intercellular junctions between the pinealocytes of male rats were investigated by freeze-fracture and conventional electron microscopy. Our findings reveal that the intercellular contacts between pineal cells, formerly described as zonulae adhaerentes or zonulae occludentes, are in fact gap junctions which are difficult to characterize in thin sections due to their peculiar geometrical arrangement, which is in the form of “fenestrated” communicating zonules. The arrangement of these communicating zonules around rudimentary lumina of pineal clusters and rare transitions between tight and gap junctions may point to phylogenetic transformations of occluding into communicating zonules, corresponding with the change of the pineal gland from a sensory to a secretory organ. Alternatively, these tight-to-gap junctional transitions may reflect the periodic (circadian or seasonal) activity of the pineal gland.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00210346
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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