Abstract
The membrane organelles of an organized tissue, such as rat liver, that will always form closed vesicles, irrespective of the mode of homogenization, are the tubular membranes of the smooth and rough endoplasmic reticulum. Almost without exception, these vesicles retain their normal orientation, i.e., the cytoplasmic face is outermost. This is particularly clear in the case of the rough endoplasmic reticulum, for the ribosomes remain attached on the outside face. The microsomal (vesicular) fraction of a homogenate will also contain vesicles derived from any domain of the plasma membrane that, in vivo, is not stabilized by structures, such as tight junctions, desmosomes, or an extensive cytoskeleton. Thus, the blood sinusoidal membrane of hepatocytes and the basolateral membranes of enterocytes both tend to form vesicles, whereas hepatocyte contiguous membranes and enterocyte microvillar membranes will remain intact, as long as the homogenization is relatively mild (see Chapter 6).
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References
Bergstrand, A. and Dallner, G. (1969) Isolation of rough and smooth microsomes from rat liver by means of a commercially available centrifuge. Anal. Biochem. 29, 351–356.
Grant, D., Siddiqui, S., and Graham, J. M. (1987) Receptor-mediated endocytosis of enterokinase by rat liver. Preliminary characterization of low-density endosomes. Biochim. Biophys. Acta 930, 346–358.
Graham, J. M. and Winterbourne, D. J. (1988) Subcellular localization of the sulphation reaction of heparan sulphate synthesis and transport of the proteoglycan to the cell surface in rat liver. Biochem. J. 252, 437–445.
Galloway, C. J., Dean, G. E., Marsh, M, Rudnick, G., and Mellman I. (1983) Acidification of macrophage and fibroblast endocytic vesicles in vitro. Proc. Natl. Acad. Sci. USA 80, 3334–3338.
Marsh, M., Schmid, S., Kern, H., Harms, E., Male, P., Mellman, I., and Helenius, A. (1987) Rapid analytical and preparative isolation of functional endosomes by free flow electrophoresis. J. Cell Biol. 104, 875–886.
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© 1993 Humana Press Inc.
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Graham, J.M. (1993). Fractionation of a Microsomal Fraction from Rat Liver or Cultured Cells. In: Graham, J.M., Higgins, J.A. (eds) Biomembrane Protocols. Methods in Molecular Biology, vol 19. Humana Press, Totowa, NJ. https://doi.org/10.1385/0-89603-236-1:51
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DOI: https://doi.org/10.1385/0-89603-236-1:51
Publisher Name: Humana Press, Totowa, NJ
Print ISBN: 978-0-89603-236-1
Online ISBN: 978-1-59259-506-8
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