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Role for the actomyosin complex in regulated exocytosis revealed by intravital microscopy.


ABSTRACT: The regulation and the dynamics of membrane trafficking events have been studied primarily in in vitro models that often do not fully reflect the functional complexity found in a living multicellular organism. Here we used intravital microscopy in the salivary glands of live rodents to investigate regulated exocytosis, a fundamental process in all of the secretory organs. We found that ?-adrenergic stimulation elicits exocytosis of large secretory granules, which gradually collapse with the apical plasma membrane without any evidence of compound exocytosis, as was previously described. Furthermore, we show that the driving force required to complete the collapse of the granules is provided by the recruitment of F-actin and nonmuscle myosin II on the granule membranes that is triggered upon fusion with the plasma membrane. Our results provide information on the machinery controlling regulated secretion and show that intravital microscopy provides unique opportunities to address fundamental questions in cell biology under physiological conditions.

SUBMITTER: Masedunskas A 

PROVIDER: S-EPMC3158220 | biostudies-literature | 2011 Aug

REPOSITORIES: biostudies-literature

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Role for the actomyosin complex in regulated exocytosis revealed by intravital microscopy.

Masedunskas Andrius A   Sramkova Monika M   Parente Laura L   Sales Katiuchia Uzzun KU   Amornphimoltham Panomwat P   Bugge Thomas H TH   Weigert Roberto R  

Proceedings of the National Academy of Sciences of the United States of America 20110801 33


The regulation and the dynamics of membrane trafficking events have been studied primarily in in vitro models that often do not fully reflect the functional complexity found in a living multicellular organism. Here we used intravital microscopy in the salivary glands of live rodents to investigate regulated exocytosis, a fundamental process in all of the secretory organs. We found that β-adrenergic stimulation elicits exocytosis of large secretory granules, which gradually collapse with the apic  ...[more]

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