Endosomal Escape
Endosomal Escape - 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.
08:03
Optogenetic Stimulation of Escape Behavior in Drosophila melanogaster
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Cited by 24 •
2013
Genetically encoded optogenetic tools enable noninvasive manipulation of specific neurons in the Drosophila brain. Such tools can identify neurons whose activation is sufficient to elicit or suppress particular behaviors. Here we present a method for activating Channelrhodopsin2 that is expressed in targeted neurons in freely walking flies.
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...
01:26
Escape Velocity
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2025
The escape velocity of an object is defined as the minimum initial velocity that it requires to escape the surface of another object to which it is gravitationally bound and never to return. For example, what would be the minimum velocity at which a satellite should be launched from the Earth's surface such that it just escapes the Earth's gravitational field? To calculate the escape velocity, it is assumed that no energy is lost to any frictional forces. In practice, a satellite launched from...
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
As endosomes become progressively acidic after endocytosis, pH-responsive delivery components can alter their interactions with the endosomal membrane. Membrane-active peptides, lipids, polymers, and viral proteins may destabilize the membrane, promote fusion, or form transient pores. These responses can release internalized cargo before it is directed toward compartments where degradation would limit its activity.
Three membrane-level responses described for endosomal escape are destabilization, fusion, and transient pore formation. Peptides, lipids, polymers, or viral proteins can trigger these effects as conditions change within the endosome. Although the mechanisms differ, each can help move cargo from an enclosed endosomal compartment into the cytosol, where intracellular targets may become accessible.
Cargo that remains within the endosomal pathway may encounter lysosomal degradation, reducing the amount available for action inside the cell. Endosomal escape provides a route around this limitation by releasing material into the cytosol. This is especially relevant for therapeutic nucleic acids and proteins, whose delivery efficiency depends on reaching intracellular targets rather than being degraded.
Therapeutic nucleic acids, proteins, and nanoparticles can all require endosomal escape to reach intracellular targets after endocytosis. Their inclusion reflects the broad range of materials considered in delivery research, rather than a single cargo class. Studying how membrane-active components release each type helps guide the development of delivery systems for distinct therapeutic and biological purposes.
A useful strategy must be considered in terms of both delivery efficiency and cellular toxicity. Researchers therefore examine whether a system releases enough cargo to support intracellular delivery while avoiding harmful effects on cells. This balance is important because stronger membrane disruption may improve release, but delivery platforms must also remain compatible with cellular function.
Endosomal escape supports several research and development areas, including gene-delivery systems, vaccines, antiviral strategies, and drug-delivery platforms. In each setting, the central goal is to help cargo reach an intracellular target after endocytosis. The process also provides a framework for studying how delivery materials interact with endosomal membranes and how those interactions affect cellular outcomes.