Endosomal Transport
Endosomal Transport - Related Videos
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.
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.
01:28
Maturation of Endosomes
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2023
The early endosome containing internalized molecules matures through transformations in its location, morphology, intraluminal pH, and membrane protein composition. Together, these changes result in a more acidic late endosome that contains multiple intraluminal vesicles; therefore, the late endosome is also called a multivesicular body (MVB). Changes in location The maturing endosome moves along microtubules from the periphery of the cell towards the perinuclear region. This movement of the...
10:51
Visualization of Endosome Dynamics in Living Nerve Terminals with Four-dimensional Fluorescence Imaging
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2014
Four-dimensional (4D) imaging is utilized to study the behavior and interactions among two types of endosomes in living vertebrate nerve terminals. Movement of these small structures is characterized in three dimensions, permitting confirmation of events such as endosome fusion and exocytosis.
00:58
Recycling Endosomes and Transcytosis
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2023
The recycling endosome, also known as the endosomal recycling compartment (ERC), is a part of the slow-recycling process of the endocytic pathway. Molecules internalized through receptor-mediated endocytosis are either degraded in the lysosomes or are recycled to the plasma membrane through the fast- or slow-recycling route. The recycling endosome is not a single organelle but an extensively tubulated network of recycling pathways. It functions in storing molecules or transporting them across...
FAQs
Rab GTPases and tethering factors coordinate the selection, formation, and recognition of transport vesicles, helping establish which membranes should interact. SNARE proteins then help drive membrane fusion once the appropriate compartments are brought together. Their complementary roles provide direction and specificity, allowing internalized cargo to progress through distinct endosomal destinations rather than moving randomly within the cell.
Early endosomes act as a sorting point after endocytosis. From there, cargo can be directed toward recycling endosomes, returned through the late-endosome route, or delivered to lysosomes. These alternatives produce different cellular outcomes: recycling supports the reuse of membrane proteins, whereas progression toward lysosomes supports degradation. Sorting therefore links intracellular routing with membrane maintenance and signal regulation.
Infectious agents may exploit or disrupt endosomal pathways in ways that affect their intracellular fate. By using these routes, they can promote entry into cells, avoid delivery to degradative compartments, or interfere with host defense signaling. Such changes can also disturb normal cargo sorting and receptor behavior, making altered trafficking a mechanism that connects cellular infection with immune dysfunction.
Endosomal transport helps determine where internalized material travels after uptake, which is important for antigen processing. Routing through successive endosomal compartments can place material in locations associated with immune handling rather than immediate recycling. This trafficking context influences how immune cells manage internalized antigens and supports the broader connection between membrane organization and immune recognition.
A useful pathway sequence begins with endocytosis, followed by entry into early endosomes and sorting into recycling endosomes, late endosomes, or lysosomes. Analysis can then consider the coordinating roles of Rab GTPases, tethering factors, and SNARE proteins at each transition. Following this sequence helps relate cargo location to recycling, degradation, receptor regulation, or pathogen persistence.
The pathway is especially relevant when a study examines antigen processing, receptor recycling, immune signaling, or the intracellular behavior of pathogens. It provides a framework for asking whether altered cargo routing changes immune-cell function or helps an infectious agent evade degradation. Because these processes affect both host defense and disease mechanisms, endosomal transport can also highlight potential therapeutic targets.