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Cytochemical localization of glucose-6-phosphatase in rabbit mononuclear phagocytes during differentiation

BA Nichols and PY Setzer

Cytochemical and biochemical investigations have revealed glucose-6- phosphatase (G-6-Pase) activity in Kupffer cells of the liver. To determine whether other mononuclear phagocytes are also reactive for G- 6-Pase, rabbit bone marrow, blood, and alveolar macrophages were tested for G-6-Pase by a modified Wachstein-Meisel method and prepared for electron microscopy. Some mononuclear phagocytes from all three tissues were intensely reactive; others were unreactive. In promonocytes, monocytes, and alveolar macrophages, reaction product for the enzyme was localized throughout all cisternae of the endoplasmic reticulum (ER) and the perinuclear cisternae, but it was absent from the Golgi complex, lysosomes, and occasional smooth tubular channels. These results indicate that mononuclear phagocytes at all stages of development contain cytochemically demonstrable G-6-Pase and that the distribution of the enzyme is not altered during their differentiation from immature cells in the bone marrow to mature macrophages in the lung.

Volume 29, Issue 2, pp. 317-320, 02/01/1981
Copyright © 1981 by The Histochemical Society


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