Summary
The ultrastructural localization of Tamm—Horsfall protein (THP) was studied in paraformaldehyde-fixed human renal biopsies. Pre-embedding and post-embedding immunogold labelling techniques were developed utilizing a monoclonal antibody specific for human urinary THP. With the pre-embedding technique, membrane contrast was enhanced by osmification thus allowing precise localization of gold particles. Reasonable tissue penetration of antibodies was achieved without compromising ultrastructural detail. The hydrophilic resin LR White was used for post-embedding labelling to ensure maximum penetration of antibodies. However, sections had only mild osmification and consequently localization of label was less certain. Both labelling techniques gave similar results. THP was found to be associated with two renal cell types. Epithelial cells lining the thick ascending limb of Henle's loop had gold label closely associated with the whole cell plasmalemma, with some of these cells having an apparently random distribution of label throughout the cytoplasm. Only the luminal plasmalemma of epithelial cells lining distal convoluted tubules were found to be labelled. Basolateral membranes and the cytoplasm of these cells were negative. The use of a monoclonal antibody of defined specificity combined with the two immunolabelling procedures represents a precise reliable method for studying ultrastructural localization of THP in the human kidney.
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Peach, R.J., Day, W.A., Ellingsen, P.J. et al. Ultrastructural localization of Tamm—Horsfall protein in human kidney using immunogold electron microscopy. Histochem J 20, 156–164 (1988). https://doi.org/10.1007/BF01746679
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DOI: https://doi.org/10.1007/BF01746679