Clathrin-coated vesicles are fundamental to synaptic vesicle recycling, receptor-mediated endocytosis, and membrane trafficking in neurons. Neurons with high clathrin activity are essential for maintaining synaptic function and are affected in neurodegenerative diseases characterized by synaptic failure .
- Clathrin triskelion: Three heavy chains + light chains
- Coat proteins: Adaptor proteins (AP2, AP180)
- Coat assembly: Clathrin polymerization
- Uncoating: Hsc70, auxilin
- Nucleation: Clathrin pit formation
- Coating: Polymerization
- Fission: Pinching off
- Uncoating: ATP hydrolysis
Clathrin-mediated endocytosis occurs at:
- Presynaptic terminals: SV recycling
- Dendritic spines: Receptor internalization
- Axon initial segment: Membrane retrieval
- Somatic membrane: General endocytosis
- CLTC: Clathrin heavy chain
- CLTA: Clathrin light chain
- AP2M1: Adaptor protein 2
- EPS15: EGFR substrate 15
- DNM2: Dynamin 2
- Endocytosis: SV membrane retrieval
- Replenishment: Sustained transmission
- Activity-dependent: Recycling rates
- Bulk endocytosis: High-frequency
- GluRs: NMDA, AMPA internalization
- Trk receptors: NGF signaling
- GPCRs: Signaling endocytosis
- LDL receptor: Cholesterol
- Surface area: Maintain
- Protein turnover: Receptor cycling
- Membrane retrieval: Exocytosis coupling
Endocytic Dysfunction:
- Early endocytic changes
- Clathrin alterations
- Receptor trafficking deficits
Mechanisms:
- Amyloid affects endocytosis
- Tau in endocytic compartments
- Synaptic vesicle depletion
Therapeutic:
- Endocytic modulators
- Synaptic protectors
Synaptic Failure:
- Clathrin changes
- SV recycling deficits
- Excitotoxicity
Dopamine Signaling:
- Receptor internalization
- Transporter trafficking
Synaptic Dysfunction:
- Impaired SV recycling
- Motor terminal failure
- Bouton degeneration
Endocytic Defects:
- Clathrin-mediated changes
- Synaptic vesicle problems
- Cargo trafficking
Clathrin-rich neurons are vulnerable because:
- High activity: Constant cycling
- Energy demands: ATP-intensive
- Oxidative stress: Accumulation
- Aging: Declining function
- Pitstop: Clathrin pit inhibitors
- Dynamol: Dynamin inhibitors (research)
- Adaptor modulators: AP2 targeting
- Trophic factors: BDNF
- Anti-oxidants: Energy support
- Neuroprotective: Broad approaches