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Electron-microscopic cytochemistry of alkaline-phosphatase activity in endothelium, pericytes and oligodendrocytes in the rat brain

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Summary

The fine structural localization of alkaline-phosphatase (ALP) activity was investigated in the endothelial cells and pericytes of blood vessels and in the oligodendrocytes of rat cerebral cortex and corpus callosum by means of electron-microscopic (EM) cytochemistry using the leadcitrate method. ALP activity was associated with both the luminal and abluminal plasma membranes of some endothelial cells, but in other endothelial cells, this activity was found inside the cytoplasm. In some pericytes, ALP activity was associated with the plasma membrane but in others, strong activity was exhibited within both the cytoplasm and nucleus. Light, medium and dark oligodendrocytes showed ALP activity on their plasma membranes; on the other hand, immature oligodendrocytes exhibited activity within the cytoplasma and on the part of their plasma membrane. Within the cytoplasm of these reacted immature cells, the rough endoplasmic reticulum, nuclear membrane and outer membrane of the mitochondria were the main sites of ALP reaction. Endothelial cells, pericytes and oligodendrocytes demonstrated ALP activity along their plasma membrane or within their cytoplasm, and pericytes showed it within their nuclei. In particular, oligodendrocytes retained ALP activity throughout their cell life, and the intracellular distribution of this activity altered as they matured.

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  1. Department of Anatomy, Kinki University School of Medicine, Sayama-cho, Minamikawachi-gun, 589, Osaka-fu, Japan

    S. Mori & M. Nagano

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  1. S. Mori
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  2. M. Nagano
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Mori, S., Nagano, M. Electron-microscopic cytochemistry of alkaline-phosphatase activity in endothelium, pericytes and oligodendrocytes in the rat brain. Histochemistry 82, 225–231 (1985). https://doi.org/10.1007/BF00501399

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