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Pancreatic secretion in the rat was stimulated in vivo by pilocarpine injection causing 90% of the storage granules to be discharged within 2 h. Incubation in vitro with [(14)C]sorbitol indicated that maximal ingestion of this extracellular space marker occurred 3 h after secretogogue injection. Morphological cell membrane measurements on cells with stimulated secretion revealed a simultaneous decrease in amount of membrane bordering the microvilli at the cell apex, lamellar processes, and infoldings present at the latero-basal face of these cells. In 3-h stimulated cells, having the average zymogen granule content characteristic for that phase of secretion, ferritin treatment in vitro showed that the infoldings and related fragmentation vesicles had ingested ferritin and could consequently be considered as being transport vehicles for redundant cell membrane. During stimulated secretion numerous vesicles and vacuoles appeared in the apical cytoplasm. Part of these structures were postulated to be related to the Golgi complex and were discussed in relation to secretory protein transport. Another part of these structures was assumed to have an endocytotic nature, although they never contained ferritin.

the journal of cell biology/the journal of cell biology

CELL MEMBRANE RESORPTION IN THE RAT EXOCRINE PANCREAS CELL AFTER IN VIVO STIMULATION OF THE SECRETION, AS STUDIED BY IN VITRO INCUBATION WITH EXTRACELLULAR SPACE MARKERS