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The Retromer Supports AMPA Receptor Trafficking During LTP
Paul Temkin1, Wade Morishita1, Debanjan Goswami1
1Nancy Pritzker Laboratory, Department of Psychiatry & Behavioral Sciences, Stanford University School of Medicine, Stanford, CA 94305-5453, USA.
Abstract:
Alterations in the function of the retromer, a multisubunit protein complex that plays a specialized role in endosomal sorting, have been linked to Alzheimer's and Parkinson's diseases, yet little is known about the retromer's role in the mature brain. Using in vivo knockdown of the critical retromer component VPS35, we demonstrate a specific role for this endosomal sorting complex in the trafficking of AMPA receptors during NMDA-receptor-dependent LTP at mature hippocampal synapses. The impairment of LTP due to VPS35 knockdown was mechanistically independent of any role of the retromer in the production of Aβ from APP. Finally, we find surprising differences between Alzheimer's- and Parkinson's-disease-linked VPS35 mutations in supporting this pathway. These findings demonstrate a key role for the retromer in LTP and provide insights into how retromer malfunction in the mature brain may contribute to symptoms of common neurodegenerative diseases. VIDEO ABSTRACT.
Insights
The retromer complex, specifically VPS35, is crucial for AMPA receptor trafficking in mature brain synapses, impacting long-term potentiation (LTP). This finding offers new insights into neurodegenerative diseases like Alzheimer's and Parkinson's.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- The retromer complex is vital for endosomal sorting, but its function in the mature brain is poorly understood.
- Dysfunctional retromer has been implicated in neurodegenerative diseases such as Alzheimer's and Parkinson's.
Purpose of the Study:
- To investigate the role of the retromer complex, specifically VPS35, in the mature brain.
- To elucidate the retromer's involvement in synaptic plasticity and its connection to neurodegenerative disease mechanisms.
Main Methods:
- In vivo knockdown of the VPS35 gene in mature hippocampal synapses.
- Electrophysiological recordings to assess NMDA-receptor-dependent long-term potentiation (LTP).
- Analysis of VPS35 mutations in relation to synaptic function.
Main Results:
- VPS35 knockdown specifically impairs AMPA receptor trafficking during LTP.
- LTP deficits resulting from VPS35 knockdown are independent of amyloid-beta production.
- Distinct Alzheimer's- and Parkinson's-disease-linked VPS35 mutations exhibit differential effects on this synaptic pathway.
Conclusions:
- The retromer complex plays a critical role in synaptic plasticity in the mature brain.
- Retromer dysfunction in the mature brain may contribute to the pathophysiology of neurodegenerative diseases.
- Understanding retromer function provides insights into potential therapeutic targets for Alzheimer's and Parkinson's diseases.