Synopsis
Kidney slices from rats injected with horseradish peroxidase (HRP) 5–10 min before sacrifice were fixed with formaldehyde vapour for 4 hr at 37°C and compared with tissue fixed by perfusion or by immersion. Much more of the injected protein was retained in extracellular and vascular spaces of the nephron in vapour-fixed than in perfusion-fixed or immersion-fixed tissue. The extracellular localization of HRP in the lateral intercellular spaces and in the infoldings of the basal cell membranes showed characteristic differences in different segments of the nephron. The high concentration of HRP in the lateral intercellular spaces of the collecting tubules, as well as the early location of small phagosomes containing HRP in the apical, lateral, and basal cell regions suggested that HRP was reabsorbed through the cytoplasm into the intercellular spaces or excreted in the opposite direction. The intercellular spaces in the terminal segments of the proximal tubules also showed high concentrations of HRP which suggests participation of these spaces in protein transport between the lumen and the peritubular capillaries. The extracellular concentration of HRP early after injection was found, by colorimetric assays of homogenates, to be several times higher in the papilla than in the cortex.
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Straus, W. Cytochemical observations on the transport of horseradish peroxidase in different segments of the nephron. Histochem J 4, 517–529 (1972). https://doi.org/10.1007/BF01011131
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DOI: https://doi.org/10.1007/BF01011131