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Fluid transport and dimensions of epithelial cells and intercellular spaces in frog gallbladder

Studies in the living state, and during processing for electron microscopy

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Summary

Morphologic findings of widely dilated intercellular spaces in fluid transporting epithelia have been claimed as evidence for the existence of an epithelial compartment in which the coupling between solute and water fluxes takes place. The validity of using epithelial geometry in sectioned material as an argument can be questioned. The present report describes the morphological appearance of frog gallbladder epithelium — normal and ouabain-treated — in the living state in vitro and after fixation, dehydration and embedding. Gallbladder segments were photographed in the living state and at the end of each step of the preparative procedure. Direct observations of whole-mounted gallbladder segments were carried out, taking advantage of the possibility of optical sectioning and high resolution by Nomarski-microscopy. The same specimens were then sectioned and examined by conventional light and electron microscopy. The observations were quantitated and showed that the epithelial cells of normal and ouabain-treated gallbladders experienced an average linear shrinkage down to 70% of their length in Ringer's solution, which corresponds to a volume shrinkage down to 35%. Moreover, dilated lateral intercellular spaces appeared during the dehydration and embedding procedure in normal but only very moderately or not at all in ouabain-treated gallbladder specimens.

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Authors and Affiliations

  1. Anatomy Department C and Institute for Experimental Medicine, University of Copenhagen, Denmark

    J. Rostgaard & O. Frederiksen

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  1. J. Rostgaard
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  2. O. Frederiksen
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Rostgaard, J., Frederiksen, O. Fluid transport and dimensions of epithelial cells and intercellular spaces in frog gallbladder. Cell Tissue Res. 215, 223–247 (1981). https://doi.org/10.1007/BF00239111

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  • DOI: https://doi.org/10.1007/BF00239111

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