title: Isolation of highly purified rat liver lysosomal membranes using two Percoll gradients.
abstract: Normal rat liver lysosomal membranes in the form of membrane vesicles have been purified using Percoll density gradient centrifugation. Lysosomes (density = 1.111) were purified approximately 63 +/- 12-fold (mean +/- standard deviation, n = 5) using a gradient of Percoll made isotonic with sucrose and buffered to pH 7.0. These lysosomes were then exposed to 10 mM methionine methyl ester, pH 7.0, the uptake of which resulted in swelling and breakage of the lysosomes with subsequent vesicle formation. These vesicles (density = 1.056) were further separated from residual mitochondrial and plasma membrane enzyme activities using a second Percoll density gradient. Marker enzyme analysis and electron microscopy indicated that the lysosomal membranes were essentially free of both beta-hexosaminidase, a soluble lysosomal enzyme, and contaminating organelles. The specific activity of lysosomal ATPase in the lysosomal membranes was fourfold greater than in the intact lysosomes.
authors.affiliation: Department of Pediatrics, University of Texas Health Science Center at Houston 77030.
authors.forename: L J
authors.initials: LJ
authors.lastname: Symons
authors.forename: A J
authors.initials: AJ
authors.lastname: Jonas
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism; D000818:Animals; D002458:Cell Fractionation / Q000379:methods*; D002499:Centrifugation, Density Gradient; D005260:Female; D007425:Intracellular Membranes / Q000201:enzymology / Q000648:ultrastructure; D008099:Liver / Q000201:enzymology / Q000648:ultrastructure*; D008247:Lysosomes / Q000201:enzymology / Q000648:ultrastructure*; D008854:Microscopy, Electron; D011205:Povidone; D051381:Rats; D011919:Rats, Inbred Strains; D012822:Silicon Dioxide
chemical_list: C016039:Percoll; D012822:Silicon Dioxide; D000251:Adenosine Triphosphatases; D011205:Povidone