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SNAREs and Membrane Fusion

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Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
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Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
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Introduction to Membrane Traffic01:44

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The ER, Golgi apparatus, endosomes, and lysosomes work in tandem to modify, sort, and package proteins and lipids. An integrated membrane trafficking network facilitates the back and forth shuttling of molecules within different organelles in the same cell or across the cell membrane.
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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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Updated: Jul 29, 2025

Preparation of Plasma Membrane Vesicles from Bone Marrow Mesenchymal Stem Cells for Potential Cytoplasm Replacement Therapy
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Outer membrane vesicles as versatile tools for therapeutic approaches.

Franz G Zingl1, Deborah R Leitner1, Himadri B Thapa1

  • 1Institute of Molecular Biosciences, University of Graz, Humboldtstrasse 50, 8010 Graz, Austria.

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|May 24, 2023
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Summary
This summary is machine-generated.

Outer membrane vesicles (OMVs) from Gram-negative bacteria are promising for medicine. These vesicles can be engineered for vaccines, drug delivery, and immune modulation, offering diverse therapeutic applications.

Keywords:
OMVbacterial vesicleshost cell interactionimmunomodulationinflammationvaccine development

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Area of Science:

  • Microbiology
  • Biotechnology
  • Immunology

Background:

  • Gram-negative bacteria release outer membrane vesicles (OMVs) during budding.
  • OMVs are spherical structures mimicking the donor cell surface and containing periplasmic contents.
  • These vesicles play roles in bacterial communication, effector delivery, and adaptation.

Purpose of the Study:

  • To review the potential medical applications of outer membrane vesicles for therapeutic strategies.
  • To explore the use of OMVs in vaccine development, drug delivery, and immune system modulation.

Main Methods:

  • Review of recent scientific literature on bacterial outer membrane vesicles.
  • Analysis of OMV properties for therapeutic and biotechnological applications.
  • Discussion of genetic engineering possibilities for OMV surface modification.

Main Results:

  • OMVs are viable nonliving vaccine candidates due to their cell-surface resemblance.
  • Genetically modified OMVs can display specific proteins and glycans for targeted therapies.
  • OMVs exhibit bioreactor properties, protecting and stabilizing luminal enzymes.
  • OMVs facilitate cell-specific drug delivery and modulate immune responses (pro- and anti-inflammatory).

Conclusions:

  • Outer membrane vesicles offer versatile platforms for vaccine development, drug delivery, and biotechnological applications.
  • Further understanding of OMV immunomodulatory effects is crucial for their application in treating inflammation, immune disorders, and cancer.