Related Experiment Video
Updated: Jul 18, 2025

Isolation and Characterization of Exosomes from Skeletal Muscle Fibroblasts
Published on: May 16, 2020
Migrasome, a novel organelle, differs from exosomes
Xun Tan1, Shujin He1,2, Fuling Wang3
1Department of Pathology, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong, 272029, China.
Abstract:
Migrasomes, a newly discovered organelle produced by migrating cells, are vesicles with membranous structure that form on the tips and intersections of retraction fibers (RFs). These structures are released into the extracellular environment or taken up by surrounding cells, mediating the release of cytoplasmic contents and intercellular communication. Retractosomes, a new type of small extracellular vesicles generated from broken-off RFs, are closely related to migrasomes in their physical location and origin, but were defined later. Despite their widespread existence in cells and biological organisms, little is known about the regulatory mechanisms underlying their formation and potential function. In this review, we provide an overview of the discovery, biogenesis, distribution, and functions of migrasomes and retractosomes, as well as their differences from exosomes.
Insights
Migrasomes and retractosomes are newly identified cellular vesicles involved in intercellular communication. This review details their formation, function, and distinctions from exosomes.
Area of Science:
- Cell Biology
- Extracellular Vesicles
- Cellular Organelles
Background:
- Migrasomes are organelles formed by migrating cells on retraction fibers.
- Retractosomes are small extracellular vesicles derived from retraction fibers.
- Both structures are involved in intercellular communication and cytoplasmic content release.
Purpose of the Study:
- To provide an overview of migrasomes and retractosomes.
- To discuss their discovery, biogenesis, distribution, and functions.
- To differentiate them from exosomes.
Main Methods:
- Literature review of existing research on migrasomes and retractosomes.
- Comparative analysis of migrasomes, retractosomes, and exosomes.
- Synthesis of current knowledge on their formation and roles.
Main Results:
- Migrasomes and retractosomes are distinct vesicle types originating from retraction fibers.
- They play roles in releasing cytoplasmic contents and mediating cell-cell communication.
- Their formation mechanisms and specific functions require further investigation.
Conclusions:
- Migrasomes and retractosomes represent significant discoveries in cell biology.
- Understanding their biogenesis and function is crucial for advancing knowledge of intercellular signaling.
- Further research is needed to fully elucidate their biological significance and therapeutic potential.
Related Concept Videos
Overview of Exosomes
Stahl et al. discovered exosomes in 1983, but the exosomes were initially considered waste products released from the...
Exocytosis
Exocytosis is the opposite of endocytosis, which brings molecules inside the cell. Sometimes, the released materials are signaling molecules. For example, neurons typically use exocytosis to release neurotransmitters. Cells also use exocytosis to insert proteins such as ion channels into their cell membranes, secrete proteins for use in the extracellular matrix, or...
Intralumenal Vesicles and Multivesicular Bodies
Cell Migration
Introduction to Membrane Traffic
The transport of soluble and membrane proteins is mediated by transport vesicles that collect cargo from one cellular compartment and deliver it to another by fusing with the target organelle membrane. The Rab...
Membrane Asymmetry Regulating Transporters
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...

