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Function of coated membranes and multivesicular bodies during membrane regulation in stimulated exocrine pancreas cells

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Summary

Stimulation of secretion by pilocarpine results in a 70% loss of zymogen granules from pancreatic acinar cell during the first hr after injection of the drug. In previous work (Geuze and Poort, 1973), we found that the amount of membrane stored in the surface of the microvilli and of the numerous infoldings present in highly stimulated cells, increases during the first 2 hr and then decreases again during the 3rd hr after stimulation, concurrently with maximal endocytosis of sorbitol-[su14C].

Further observations on the fine structure of stimulated cells at various time intervals after injection of pilocarpine showed that during the first hr numerous smooth vesicles and multivesicular bodies (mvb's) appear in the apical cytoplasm, while the number of coated vesicles and their relative total volume increase significantly 3 hr after stimulation.

By infusion of ferritin in the pancreatic duct system in vivo and application of cytochemical techniques (osmium impregnation, electron microscope autoradiography and acid phosphatase cytochemistry) it could be established that after stimulated exocytotic secretion, redundant apical cell membrane is withdrawn by at least two routes: 1) During the initial rapid increase of the amount of apical cell membrane, withdrawal is accomplished by interiorization of luminal invaginations into smooth endocytotic vesicles, which in turn give rise to mvb's by infolding and subsequent fission of their limiting membrane. 2) Once the bulk of stored secretion granules has been discharged, endocytotic coated vesicles become gradually more prominent as carriers for redundant cell membrane. The contents of endocytotic structures ultimately become incorporated in residual bodies, suggesting lysosomal degradation of cell membrane prior to eventual reutilization.

Coated vesicles also originate by pinching off from mature Golgi cisternae and condensing vacuoles. A possible function of the coated membranes in the concentration of exportable protein within forming secretory granules is discussed.

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Geuze, J.J., Kramer, M.F. Function of coated membranes and multivesicular bodies during membrane regulation in stimulated exocrine pancreas cells. Cell Tissue Res. 156, 1–20 (1974). https://doi.org/10.1007/BF00220098

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