Abstract
In the kidney a striking parallel exists between the expression of ecto-5′-nucleotidase and of erythropoietin by renal fibroblasts. It was therefore hypothesized that the expression of ecto-5′-nucleotidase in fibroblasts might be controlled by oxygen tension. In order to test this hypothesis, we examined the distribution of the enzyme in a tissue which displays a defined zonation in respect to oxygen tension, namely in the liver; anaemia was used in order to exaggerate this zonation. The distribution of ecto-5′-nucleotidase was investigated by light and electron microscopy using enzyme and immunohistochemical methods in the livers of healthy and of anaemic rats. Anaemia was produced by haemolysis combined with X-ray irradiation. The enzyme was detected in the bile canaliculi, in the connective tissue of the portal triads and of the central veins, and in fat-storing cells probably corresponding to a special form of fibroblasts. In healthy animals the perisinusoidal ecto-5′-nucleotidase activity was slightly higher in the pericentral than in the periportal area of the acinus whereas the inverse was observed for the staining of bile canaliculi. Anaemia provoked an increase of ecto-5′-nucleotidase in fat-storing cells in the pericentral zone of the acinus and in fibroblasts around the central veins, resulting in steepended gradients along the sinusoids. The intralobular gradient of ecto-5′-nucleotidase in perisinusoidal cells and the effect thereon of anaemia suggest that the expression of the ecto-5′-nucleotidase might be directly or indirectly controlled by local oxygen tension.
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Schmid, T.C., Loffing, J., Le Hir, M. et al. Distribution of ecto-5′-nucleotidase in the rat liver: effect of anaemia. Histochemistry 101, 439–447 (1994). https://doi.org/10.1007/BF00269494
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DOI: https://doi.org/10.1007/BF00269494