Exosome Secreting Neurons is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Exosome-Secreting Neurons are neurons that release extracellular vesicles (EVs), particularly exosomes, which play critical roles in intercellular communication within the brain. These vesicles can propagate pathological proteins and signals between neurons and glial cells, contributing to disease progression in neurodegenerative disorders.
Exosomes are small extracellular vesicles (30-150 nm) formed within endosomal compartments and released upon fusion with the plasma membrane. Neuronal exosomes are increasingly recognized as important vectors for:
- Spread of misfolded proteins
- Horizontal transfer of microRNAs
- Immune system modulation
- Metabolic regulation
¶ Biogenesis and Release
flowchart TD
A[Early Endosome] --> B[Late Endosome/MVB] -->
B --> C[Intraluminal Vesicles] -->
C --> D[Exosome Biogenesis] -->
E[ESCRT Complex] --> D
F[Alix] --> D
G[Syntenin] --> D
H[CD63/CD81] --> D
D --> I[Fusion with Plasma Membrane] -->
I --> J[Exosome Release] -->
K[Neuronal Cargo] --> C
K --> L[Pathological Proteins] -->
K --> M[Regulatory RNAs] -->
K --> N[Metabolic Enzymes]
Key molecules packaged into neuronal exosomes:
- Amyloid-beta (Aβ)
- Tau protein
- Alpha-synuclein
- Huntingtin protein
- TDP-43
- MicroRNAs (miR-9, miR-124, miR-132)
- Synaptic proteins
- Mitochondrial components
- Aβ secretion via exosomes
- Tau propagation between neurons
- miR-212/132 dysregulation
- Astrocyte-neuron exosome exchange
- Alpha-synuclein spread via exosomes
- LRRK2 mutation effects on secretion
- Dopaminergic neuron-specific cargo
- Glial uptake of neuronal exosomes
- SOD1 transmission
- TDP-43 propagation
- miRNA signatures in CSF exosomes
- Non-cell autonomous toxicity
- Mutant huntingtin secretion
- Exosome-mediated spread
- Wild-type HTT transfer
- Glial modulation
| Biomarker |
Disease |
Source |
| Aβ in neuron-derived exosomes |
AD |
CSF |
| Alpha-synuclein |
PD |
CSF, blood |
| TDP-43 |
ALS/FTD |
CSF |
| miR-9-5p |
ALS |
CSF |
- Exosome release inhibitors
- Cargo-specific neutralizing antibodies
- Engineered exosomes for drug delivery
- Interference with uptake mechanisms
Neuronal exosomes can be engineered to:
- Deliver therapeutic RNAs
- Cross the blood-brain barrier
- Target specific neuron populations
- Modulate immune response
- Ultracentrifugation
- Size-exclusion chromatography
- Immunoaffinity capture
- Precipitation methods
- Nanoparticle tracking analysis (NTA)
- Cryo-electron microscopy
- Western blot for exosome markers
- Proteomics lipidomics
- Fluorescent labeling
- Bioluminescence tracking
- CSF biomarker analysis
- Peripheral fluid analysis
The study of Exosome Secreting Neurons has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- Quek C, Hill AF. (2017). The role of extracellular vesicles in neurodegenerative diseases. Biophys Acta. 1861(11):2960-2971.
- Vella LJ, et al. (2017). The role of neuronal exosomes in neurodegeneration. Acta Neuropathol. 133(3):391-407.
- Stuendl A, et al. (2016). Induction of alpha-synuclein aggregate formation by CSF exosomes from patients with Parkinson's disease. Brain. 139(Pt 3):856-870.
- Yuyama K, et al. (2015). Accelerated amyloid beta pathology in neurons derived from iPS cells carrying app mutation. Mol Brain. 8:69.
- Bellingham SA, et al. (2012). Exosomes: novel biomarkers and therapeutic tools for neurodegenerative diseases. Gene Ther. 19(6):613-620.