Abstract
The localization of plasma retinol-binding protein (RBP) in the human kidney was determined by two immunocytochemical techniques, the PAP method and the protein A-gold technique. By using the affinity purified antibody against RBP obtained from the urine of the patients with cadmium poisoning (Itai-Itai disease), the immunoreactive substances were located by light microscopy in the proximal tubules of the human kidney. By immuno-electron microscopy, the stained organelles were identified as lysosomes in both S1 and S2 segments of the tubules. These data suggested that the reabsorption of low molecular weight plasma proteins like RBP can occur in the two segments. We inferred a similarity between the S1 and S2 segments concerning the reabsorption of RBP.
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