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Intercellular junctions in the water-blood barrier of the gill lamella in the adult lamprey (Geotria australis, Lampetra fluviatilis)

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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.

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Authors and Affiliations

  1. Abteilung für Zellbiologie und Elektronenmikroskopie, Medizinische Hochschule Hannover, Konstanty-Gutschow-Strasse 8, D-30625, Hannover, Germany

    Helmut Bartels

  2. School of Environmental and Life Sciences, Murdoch University, 6150, Murdoch, Western Australia, Australia

    Ian C. Potter

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  1. Helmut Bartels
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  2. Ian C. Potter
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This paper is dedicated to Professor H. Leonhardt on the occasion of his 75th birthday

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Bartels, H., Potter, I.C. Intercellular junctions in the water-blood barrier of the gill lamella in the adult lamprey (Geotria australis, Lampetra fluviatilis). Cell Tissue Res 274, 521–532 (1993). https://doi.org/10.1007/BF00314549

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  • DOI: https://doi.org/10.1007/BF00314549

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