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Enzyme induction of HeLa cell placental alkaline phosphatase with various agents such as prednisolone, sodium butyrate, hyperosmolality (NaCl), or combination of these inducers resulted in the appearance of enzyme activity in the rough endoplasmic reticulum, nuclear envelope, Golgi apparatus, and plasma membrane. In the Golgi apparatus, intense reaction product deposits tended to be concentrated on its trans side, with small vesicles and granules also being positively stained. Inhibition of protein synthesis with cycloheximide was followed by the disappearance of enzyme activity from these cytoplasmic organelles but not from the plasma membrane. Treatment with monensin, a secretory protein transport inhibitor, uniformly increased activity in the rough endoplasmic reticulum while causing marked dilatation of the intensely positive Golgi cisternae. These results suggest that intracellular alkaline phosphatase is newly synthesized in the endoplasmic reticulum and then passes en route through the Golgi apparatus to the plasma membrane. Accordingly, the present system could represent the biosynthesis, transport, and incorporation of the model cell surface enzyme protein to add to the vesicular stomatitus virus glyco-1 (VSV-G) protein and acetylcholine receptor model systems for studying the dynamics of cell surface protein genesis, transport, and membrane integration.

journal of histochemistry and cytochemistry/the journal of histochemistry and cytochemistry

Alkaline phosphatase biosynthesis in the endoplasmic reticulum and its transport through the Golgi apparatus to the plasma membrane: cytochemical evidence.