Abstract
Electron microscopic cytochemistry was performed on the rat choroid plexus epithelium to reveal the enzymatic sites of the activities of glucose-6-phosphatase and thiamine pyrophosphatase. Glucose-6-phosphatase was mainly situated in the endoplasmic reticulum and nuclear envelope, and thiamine pyrophosphatase in the Golgi complex. The ultrastructure of these two enzyme localizations in these tissues, has not been described. These enzymes can thus be considered as marker enzymes for their respective organelles in the choroid plexus epithelial cells, as well as in other tissues. The function of these enzymes in the choroid plexus epithelial cells might be related to carbohydrate metabolism.
