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Fractionation of Subcellular Membrane Vesicles of Epithelial and Non-epithelial Cells by OptiPrep™ Density Gradient Ultracentrifugation

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Part of the book series: Methods in Molecular Biology ((MIMB,volume 1174))

Abstract

Density gradient ultracentrifugation (DGUC) is widely used for physical isolation (enrichment rather than purification) of subcellular membrane vesicles. It has been a valuable tool to study specific subcellular localization and dynamic trafficking of proteins. While sucrose has been the main component of density gradients, several years ago, synthetic OptiPrep™ (iodixanol) began being used for separation of organelles due to its iso-osmotic property. Here, we describe a detailed protocol for density gradient fractionation of various mammalian subcellular vesicles, including endoplasmic reticulum (ER), Golgi apparatus, endosomes, and lipid rafts, as well as apical and basolateral membranes of polarized epithelial cells.

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Acknowledgments

This work is supported by in part by the National Institutes of Health, NIDDK Grants KO1-DK62264, RO1-DK26523, RO1-DK61765, PO1-DK44484, PO1-DK72084, R24-DK64388, Broad Medical Research Program Grant (IBD-0119R2), and the Hopkins Center for Epithelial Disorders. We thank the Elsevier Inc. for permission to reuse the figures originally published in its journal Gastroenterology.

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Correspondence to Xuhang Li .

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Li, X., Donowitz, M. (2014). Fractionation of Subcellular Membrane Vesicles of Epithelial and Non-epithelial Cells by OptiPrep™ Density Gradient Ultracentrifugation. In: Ivanov, A. (eds) Exocytosis and Endocytosis. Methods in Molecular Biology, vol 1174. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-0944-5_6

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  • DOI: https://doi.org/10.1007/978-1-4939-0944-5_6

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  • Publisher Name: Humana Press, New York, NY

  • Print ISBN: 978-1-4939-0943-8

  • Online ISBN: 978-1-4939-0944-5

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