REDISTRIBUTION OF A RAB3-LIKE GTP-BINDING PROTEIN FROM SECRETORY GRANULES TO THE GOLGI-COMPLEX IN PANCREATIC ACINAR-CELLS DURING REGULATED EXOCYTOSIS

JENA BP, GUMKOWSKI FD, KONIECZKO EM, Fischer von Mollard G, JAHN R, JAMIESON JD (1994)
JOURNAL OF CELL BIOLOGY 124(1): 43-53.

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Abstract
Regulated secretion from pancreatic acinar cells occurs by exocytosis of zymogen granules (ZG) at the apical plasmalemma. ZGs originate from the TGN and undergo prolonged maturation and condensation. After exocytosis, the zymogen granule membrane (ZGM) is retrieved from the plasma membrane and ultimately reaches the TGN. In this study, we analyzed the fate of a low M(r) GTP-binding protein during induced exocytosis and membrane retrieval using immunoblots as well as light and electron microscopic immunocytochemistry. This 27-kD protein, identified by a monoclonal antibody that recognizes rab3A and B, may be a novel rab3 isoform. In resting acinar cells, the rab3-like protein was detected primarily on the cytoplasmic face of ZGs, with little labeling of the Golgi complex and no significant labeling of the apical plasmalemma or any other intracellular membranes. Stimulation of pancreatic lobules in vitro by carbamylcholine for 15 min, resulted in massive exocytosis that led to a near doubling of the area of the apical plasma membrane. However, no relocation of the rab3-like protein to the apical plasmalemma was seen. After 3 h of induced exocytosis, during which time approximately 90% of the ZGs is released, the rab3-like protein appeared to translocate to small vesicles and newly forming secretory granules in the TGN. No significant increase of the rab3-like protein was found in the cytosolic fraction at any time during stimulation. Since the protein is not detected on the apical plasmalemma after stimulation, we conclude that recycling may involve a membrane dissociation-association cycle that accompanies regulated exocytosis.
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JENA BP, GUMKOWSKI FD, KONIECZKO EM, Fischer von Mollard G, JAHN R, JAMIESON JD. REDISTRIBUTION OF A RAB3-LIKE GTP-BINDING PROTEIN FROM SECRETORY GRANULES TO THE GOLGI-COMPLEX IN PANCREATIC ACINAR-CELLS DURING REGULATED EXOCYTOSIS. JOURNAL OF CELL BIOLOGY. 1994;124(1):43-53.
JENA, B. P., GUMKOWSKI, F. D., KONIECZKO, E. M., Fischer von Mollard, G., JAHN, R., & JAMIESON, J. D. (1994). REDISTRIBUTION OF A RAB3-LIKE GTP-BINDING PROTEIN FROM SECRETORY GRANULES TO THE GOLGI-COMPLEX IN PANCREATIC ACINAR-CELLS DURING REGULATED EXOCYTOSIS. JOURNAL OF CELL BIOLOGY, 124(1), 43-53. doi:10.1083/jcb.124.1.43
JENA, B. P., GUMKOWSKI, F. D., KONIECZKO, E. M., Fischer von Mollard, G., JAHN, R., and JAMIESON, J. D. (1994). REDISTRIBUTION OF A RAB3-LIKE GTP-BINDING PROTEIN FROM SECRETORY GRANULES TO THE GOLGI-COMPLEX IN PANCREATIC ACINAR-CELLS DURING REGULATED EXOCYTOSIS. JOURNAL OF CELL BIOLOGY 124, 43-53.
JENA, B.P., et al., 1994. REDISTRIBUTION OF A RAB3-LIKE GTP-BINDING PROTEIN FROM SECRETORY GRANULES TO THE GOLGI-COMPLEX IN PANCREATIC ACINAR-CELLS DURING REGULATED EXOCYTOSIS. JOURNAL OF CELL BIOLOGY, 124(1), p 43-53.
B.P. JENA, et al., “REDISTRIBUTION OF A RAB3-LIKE GTP-BINDING PROTEIN FROM SECRETORY GRANULES TO THE GOLGI-COMPLEX IN PANCREATIC ACINAR-CELLS DURING REGULATED EXOCYTOSIS”, JOURNAL OF CELL BIOLOGY, vol. 124, 1994, pp. 43-53.
JENA, B.P., GUMKOWSKI, F.D., KONIECZKO, E.M., Fischer von Mollard, G., JAHN, R., JAMIESON, J.D.: REDISTRIBUTION OF A RAB3-LIKE GTP-BINDING PROTEIN FROM SECRETORY GRANULES TO THE GOLGI-COMPLEX IN PANCREATIC ACINAR-CELLS DURING REGULATED EXOCYTOSIS. JOURNAL OF CELL BIOLOGY. 124, 43-53 (1994).
JENA, BP, GUMKOWSKI, FD, KONIECZKO, EM, Fischer von Mollard, Gabriele, JAHN, R, and JAMIESON, JD. “REDISTRIBUTION OF A RAB3-LIKE GTP-BINDING PROTEIN FROM SECRETORY GRANULES TO THE GOLGI-COMPLEX IN PANCREATIC ACINAR-CELLS DURING REGULATED EXOCYTOSIS”. JOURNAL OF CELL BIOLOGY 124.1 (1994): 43-53.
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