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Alpha-Synuclein and LRRK2 in Synaptic Autophagy: Linking Early Dysfunction to Late-Stage Pathology in Parkinson's
Giulia Lamonaca1, Mattia Volta1
1Institute for Biomedicine, Eurac Research-Affiliated Institute of the University of Lübeck, 39100 Bolzano, Italy.
Abstract:
The lack of effective disease-modifying strategies is the major unmet clinical need in Parkinson´s disease. Several experimental approaches have attempted to validate cellular targets and processes. Of these, autophagy has received considerable attention in the last 20 years due to its involvement in the clearance of pathologic protein aggregates and maintenance of neuronal homeostasis. However, this strategy mainly addresses a very late stage of the disease, when neuropathology and neurodegeneration have likely "tipped over the edge" and disease modification is extremely difficult. Very recently, autophagy has been demonstrated to modulate synaptic activity, a process distinct from its catabolic function. Abnormalities in synaptic transmission are an early event in neurodegeneration with Leucine-Rich Repeat Kinase 2 (LRRK2) and alpha-synuclein strongly implicated. In this review, we analyzed these processes separately and then discussed the unification of these biomolecular fields with the aim of reconstructing a potential "molecular timeline" of disease onset and progression. We postulate that the elucidation of these pathogenic mechanisms will form a critical basis for the design of novel, effective disease-modifying therapies that could be applied early in the disease process.
Insights
Autophagy
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Parkinson's disease lacks effective disease-modifying treatments.
- Autophagy is crucial for clearing protein aggregates and neuronal homeostasis.
- Current autophagy strategies target late disease stages, limiting efficacy.
Purpose of the Study:
- To explore autophagy's role in synaptic activity, distinct from its catabolic function.
- To investigate early neurodegenerative events involving Leucine-Rich Repeat Kinase 2 (LRRK2) and alpha-synuclein.
- To unify understanding of autophagy and synaptic function for early therapeutic intervention.
Main Methods:
- Review of existing literature on autophagy and neurodegeneration.
- Analysis of Leucine-Rich Repeat Kinase 2 (LRRK2) and alpha-synuclein roles in synaptic transmission.
- Reconstruction of a molecular timeline for Parkinson's disease onset and progression.
Main Results:
- Autophagy modulates synaptic activity, an early event in neurodegeneration.
- LRRK2 and alpha-synuclein are implicated in early synaptic transmission abnormalities.
- A potential molecular timeline integrating autophagy and synaptic dysfunction was proposed.
Conclusions:
- Understanding early pathogenic mechanisms is key to developing effective disease-modifying therapies.
- Targeting autophagy's role in synaptic activity may offer early intervention strategies for Parkinson's disease.
- Elucidating these interconnected pathways is crucial for novel therapeutic design.
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