Summary
Four heavy metal staining methods have been applied to frog lung surfactant. Among them, the iodoplatinate method is the only one that almost exclusively visualizes the phospholipid moiety being produced in the lamellated bodies of the pulmonary epithelial cells and forming the backbone of organized structures within the extracellular lining layer. The other three techniques — ruthenium red-osmium tetroxide, osmium tetroxideferrocyanide, acidic phosphotungstic acid in chromate (Rambourg technique) — more or less give electron contrast to glycoproteins and to a lesser extent to the hydrophilic parts of phospholipids. They all show the extracellular lining layer to be a two component system: the content of the lamellar bodies from — when released — membranous configurations, similar to those observed in mammalian lungs; they unfold in an amorphous hypophase, which is apparently secreted by goblet cells of the pulmonary epithelium.
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Dierichs, R., Lindner, E. Methods of heavy metal electron microscopic histochemistry applied to frog lung surfactant. Histochemistry 61, 199–212 (1979). https://doi.org/10.1007/BF00496532
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DOI: https://doi.org/10.1007/BF00496532