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Maturation of Endosomes01:28

Maturation of Endosomes

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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).
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Essential proteins such as insulin or low-density lipoprotein (LDL) and micronutrients such as iron enter a eukaryotic cell through receptor-mediated endocytosis. Subsequently, the early endosomes fuse with the vesicles containing such receptor-ligand complexes and play a vital role in sorting the incoming ligands and receptors. While the ligands are either degraded inside the vesicle or released into the cytosol, their receptors are returned to the plasma membrane for further rounds of...
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Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
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Recycling Endosomes and Transcytosis00:58

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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.
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Receptor-mediated endocytosis is when bulk amounts of specific molecules are imported into a cell after binding to cell surface receptors. The molecules bound to these receptors are taken into the cell through inward folding of the cell surface membrane, which is eventually pinched off into a vesicle within the cell. Structural proteins, such as clathrin, coat the budding vesicle.
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Measuring Synaptic Vesicle Endocytosis in Cultured Hippocampal Neurons
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The structure and function of presynaptic endosomes.

Sebastian Jähne1, Silvio O Rizzoli2, Martin S Helm3

  • 1Department of Neuro- and Sensory Physiology, University of Göttingen Medical Center, Cluster of Excellence Nanoscale Microscopy and Molecular Physiology of the Brain, Humboldtallee 23, 37073 Göttingen, Germany; International Max Planck Research School for Neurosciences, 37077 Göttingen, Germany.

Experimental Cell Research
|May 6, 2015
PubMed
Summary
This summary is machine-generated.

Synaptic endosomes remain controversial due to undefined roles and markers. This review clarifies their potential functions in synaptic vesicle recycling and proposes a common definition for these elusive structures.

Keywords:
EndocytosisEndosomePresynapseProtein degradationProtein sortingSynaptic vesicle recycling

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Synaptic Plasticity

Background:

  • The precise role and definition of endosomes within the presynaptic terminal are debated.
  • Lack of consensus on markers and definitions hinders understanding of synaptic endosomes.
  • Existing models propose synaptic endosomes as stable organelles or transient intermediates in vesicle recycling.

Purpose of the Study:

  • To review current evidence for synaptic endosomes.
  • To discuss their potential functions in presynaptic neurotransmission.
  • To propose a unified definition and identify research pathways.

Main Methods:

  • Literature review of existing studies on synaptic endosomes.
  • Analysis of proposed functions and experimental evidence.
  • Identification of technical challenges and pitfalls in studying synaptic endosomes.

Main Results:

  • Synaptic endosome function in protein sorting and vesicle recycling is not definitively established.
  • Conflicting data exists regarding their stability and role in the synaptic vesicle cycle.
  • Frequent technical limitations complicate the analysis of these presynaptic compartments.

Conclusions:

  • A clear definition and consistent markers are needed for synaptic endosomes.
  • Further research is required to elucidate their exact function in synaptic vesicle dynamics.
  • Addressing technical pitfalls is crucial for advancing our understanding of these structures.