Summary
The distribution of diverse types of intermediate filaments and desmosomal plaque proteins in rat and bovine kidney has been studied by immunofluorescence microscopy on cryostat sections using antibodies to vimentin, desmin, various preparations of epidermal prekeratins, hepatic cytokeratins as well as a monoclonal cytokeratin antibody which recognizes a wide range of different cytokeratin polypeptides. These immunocytochemical reactions have revealed an unexpected cell type complexity in terms of intermediate filament composition. Vimentin-positive cells are identified as interstitial fibroblasts, capillary endothelia and other vascular wall cells as well as practically all glomerular cells, including podocytes and mesangial cells. Co-existence of vimentin and desmin filaments has been found in glomerular and extra-glomerular mesangial cells, in agreement with the notion that these cells are derived from a specific subset of vascular smooth cells simultaneously expressing vimentin and desmin.
Unexpected differentiations of staining with antibodies to cytokeratins and desmoplakins are noted in the various kidney epithelia. The epithelial cells of Bowman's capsule are heterogeneous in that most cells do not stain with any of the antibodies applied but one group of parietal Bowman's capsule cells forms a conspicuous “crescent” strongly stained with cytokeratin antibodies which so far has not been distinguished from other parietal Bowman's capsule cells by ultrastructural criteria. Certain parts of the nephron such as the proximal convoluted tubule, the descending thin limbs of long loops, the ascending thick limb, and the distal convoluted tubule show poor, if any staining with antibodies to cytokeratins and desmoplakins. By contrast, the straight part of the proximal tubule, the descending thin limbs of short loops, the macula densa, the connecting tubules and the collecting ducts are well stained with antibodies to cytokeratins and desmoplakins, allowing further differentiations according to the specific intracellular distribution of cytokeratin density (apical vs. basolateral vs. general cytoplasmic). The distribution of strong and weak staining tubular segments roughly correlates with the degree of cellular interdigitation of the epithelium. Connecting tubules and collecting ducts show particularly strong staining with cytokeratin antibodies, the highest intensity being characteristic of the collecting duct principal cells. The mesothelial layer covering the organ is also positive for cytokeratins.
The distribution of intermediate filaments and desmosomal plaque proteins in the kidney is discussed in relation to the formation of this organ from embryonal mesenchyme, a cell type that only contains intermediate filaments of the vimentin type. The differences of staining with antibodies to cytokeratins and desmoplakins in the various kidney epithelia are also discussed in relation to morphological differences of epithelial organization and regional differences of function. Our immunocytochemical data suggest that cytokeratins of kidney tubules are different from epidermal prekeratins and are more closely related to those of other simple epithelial cells such as hepatocytes and intestinal mucosa. They also indicate differences of cytokeratin filaments in different parts of the nephron. The value of the use of these antibodies against cytoskeletal proteins in the differentiation of normal and pathologically altered kidney cells, including tumors, is emphasized.
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Bachmann, S., Kriz, W., Kuhn, C. et al. Differentiation of cell types in the mammalian kidney by immunofluorescence microscopy using antibodies to intermediate filament proteins and desmoplakins. Histochemistry 77, 365–394 (1983). https://doi.org/10.1007/BF00490899
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DOI: https://doi.org/10.1007/BF00490899