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• W2022802694 abstract "In most eukaryotic cells, microtubules and filamentous actin (F-actin) provide tracks on which intracellular organelles move using molecular motors. Here we report that cytoplasmic movement of both mitochondria and lysosomes is slowed by F-actin meshwork formation in pancreatic duct epithelial cells (PDEC). Mitochondria and lysosomes were labeled with fluorescent Mitotracker Red CMXRos and Lysotracker Red DND-99, respectively, and their movements were monitored using epi-fluorescence and confocal microscopy. Mitochondria and lysosomes moving actively at rest stopped rapidly within several seconds after an intracellular Ca(2+) rise induced by activation of P2Y(2) purinergic receptors. The 'freezing' of the organelles was inhibited by blocking the Ca(2+) rise or by pretreatment with latrunculin B, an inhibitor of F-actin formation. Indeed, this freezing effect on the organelles was accompanied by the formation of F-actin in the whole cytoplasm as stained with Alexa 488-phalloidin in fixed PDEC. For real-time monitoring of F-actin formation in live cells, we expressed sGFP-fimbrin actin binding domain2 (fABD2) in PDEC. Rapid recruitment of the fluorescent probe near the nucleus and lysosomes suggested dense F-actin formation around intracellular structures. The development of F-actin paralleled that of organelle freezing. We conclude that rapid Ca(2+)-dependent F-actin formation physically restrains intracellular organelles and reduces their mobility non-selectively in PDEC." @default.
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• W2022802694 date "2012-06-01" @default.
• W2022802694 modified "2023-09-30" @default.
• W2022802694 title "Actin cytoskeleton controls movement of intracellular organelles in pancreatic duct epithelial cells" @default.
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• W2022802694 doi "https://doi.org/10.1016/j.ceca.2012.04.004" @default.
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