Isolation and Characterization of Three Endosomal Fractions from the Liver of Estradiol-treated Rats

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1987 Oct 1

PMID 3477810

Citations 19

Authors

J D Belcher

R L Hamilton

S E Brady

C A Hornick

S Jaeckle

W J Schneider

R J HAVEL

Affiliations

Soon will be listed here.

Abstract

Three distinct endosomal fractions were isolated in high purity from livers of estradiol-treated rats. Each fraction had characteristic physical and ultrastructural properties, but the lipid composition and major proteins of their membranes were similar and differed from those derived from the Golgi apparatus. Injected radioiodinated low density lipoproteins accumulated first in the fraction of intermediate density and later in the low density fraction. The latter was composed almost exclusively of lipoprotein-filled multivesicular bodies, most of which had a single membranous appendage. The fraction of intermediate density was composed of lipoprotein-filled vesicles that were smaller than multivesicular bodies and also had membranous appendages. The high density fraction was composed of membranes resembling the appendages of the two vesicular fractions. All three fractions were enriched in receptors for low density lipoproteins and asialoglycoproteins, but receptor concentrations were considerably reduced in multivesicular bodies. The fraction of intermediate density may represent the compartment of uncoupling of receptor and ligand (CURL) described by Geuze et al. [Geuze, H. J., Slot, J. W., Strous, G. J. A. M., Lodish, H. F. & Schwartz, A. L. (1983) Cell 32, 277-287]. CURL vesicles may lose some of their appendage as multivesicular bodies are formed. The high density fraction then may represent a receptor-recycling compartment.

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