Endosome-enriched Fraction
Endosome-enriched Fraction - Related Videos
08:22
Preparation of Mitochondrial Enriched Fractions for Metabolic Analysis in Drosophila
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Cited by 13 •
2015
Mitochondria play central roles in the regulation of metabolism and homeostasis. Subtle changes in mitochondrial metabolism that affect organismal physiology could be difficult to detect in whole organism metabolomics studies. Here we describe an isolation method that enhances the detection of subtle metabolic shifts in Drosophila melanogaster.
12:15
In Vitro Polymerization of F-actin on Early Endosomes
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Cited by 3 •
2017
Early endosome functions depend on F-actin polymerization. Here, we describe a microscopy-based in vitro assay that reconstitutes the nucleation and polymerization of F-actin on early endosomal membranes in test tubes, thus rendering this complex series of reactions amenable to biochemical and genetic manipulations.
07:58
Stromal Vascular Fraction-enriched Fat Grafting for the Treatment of Symptomatic End-neuromata
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Cited by 8 •
2017
The purpose of the study is to illustrate the technical procedure of stromal vascular fraction (SVF)-enriched fat grafting as a novel treatment of symptomatic end-neuromata. This technique provides advantages of both the mechanical barrier and the biological action at the cellular level by the processed and concentrated SVF.
04:16
Stromal Vascular Fraction-Enriched Fat Grafting for the Management of Symptomatic Neuromas
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2025
Source: Zimmermann, S., et.al. Stromal Vascular Fraction-enriched Fat Grafting for the Treatment of Symptomatic End-neuromata. J. Vis. Exp. (2017)This video demonstrates the surgical procedure for neurolysis and stromal vascular fraction (SVF)-enriched fat grafting in the management of symptomatic neuroma. Neurolysis removes adhesion tissue to restore nerve gliding, while SVF-enriched fat grafting is applied around the nerve to create a protective barrier, support nerve healing, and enhance...
09:49
Nanogold Labeling of the Yeast Endosomal System for Ultrastructural Analyses
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Cited by 1 •
2014
Yeast, Saccharomyces cerevisiae, has been a key model organism to identify and study genes regulating the biogenesis and functions of the endosomal system. Here we present a detailed protocol for the specific labeling of the endosomal compartments for ultrastructural studies.
FAQs
Separation depends on physical behavior rather than a single molecular marker. During differential centrifugation, organelles sediment according to their size and sedimentation behavior; density-gradient separation then further resolves membrane compartments according to density. Combining these steps increases the relative representation of endosomes, making the preparation more informative for biochemical measurements than a broadly collected membrane fraction.
An endosome-enriched fraction should be interpreted as enriched, not pure. Other membrane compartments may remain because organelles can share overlapping physical properties during centrifugation and gradient separation. This limitation matters when assigning a protein or lipid to endosomes: enrichment supports localization analysis, but conclusions should account for possible contamination rather than treating every detected component as exclusively endosomal.
Its value lies in connecting biochemical material to trafficking questions. Researchers can examine internalized cargo, receptor recycling, and endosomal maturation within the same experimental framework. This helps relate measured proteins and lipids to how endocytic compartments handle cargo over the course of intracellular transport pathways.
Preparation generally begins with differential centrifugation and is followed by density-gradient separation. The first stage uses differences in organelle sedimentation behavior to separate membrane material, while the gradient provides an additional separation based on density. The resulting fraction is then used as biochemical material, with enrichment assessed in context rather than assumed to represent complete purity.
Applications span both pathway biology and membrane biochemistry. The material can support analysis of cargo trafficking, receptor recycling, endosomal maturation, membrane composition, and protein localization. These uses make the preparation useful for connecting molecular measurements with endocytic transport research. It can help investigators examine which proteins or lipids are associated with the fraction and how those measurements relate to trafficking-related processes.
Protein localization results require cautious interpretation because enrichment does not establish exclusive residence in endosomes. A protein detected in the preparation may reflect endosome association, but residual contamination from other membrane compartments can contribute to the signal. Researchers therefore use the fraction as supporting biochemical evidence for localization, not as proof of absolute compartment specificity.