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RAB-6.2 and the retromer regulate glutamate receptor recycling through a retrograde pathway
Abstract
Regulated membrane trafficking of AMPA-type glutamate receptors (AMPARs) is a key mechanism underlying synaptic plasticity, yet the pathways used by AMPARs are not well understood. In this paper, we show that the AMPAR subunit GLR-1 in Caenorhabditis elegans utilizes the retrograde transport pathway to regulate AMPAR synaptic abundance. Mutants for rab-6.2, the retromer genes vps-35 and snx-1, and rme-8 failed to recycle GLR-1 receptors, resulting in GLR-1 turnover and behavioral defects indicative of diminished GLR-1 function. In contrast, expression of constitutively active RAB-6.2 drove the retrograde transport of GLR-1 from dendrites back to cell body Golgi. We also find that activated RAB-6.2 bound to and colocalized with the PDZ/phosphotyrosine binding domain protein LIN-10. RAB-6.2 recruited LIN-10. Moreover, the regulation of GLR-1 transport by RAB-6.2 required LIN-10 activity. Our results demonstrate a novel role for RAB-6.2, its effector LIN-10, and the retromer complex in maintaining synaptic strength by recycling AMPARs along the retrograde transport pathway.
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VPS35 suppression decreased surface levels of GLUT1/SLC2A1, AMPA receptors GRIA2, GRIA3, GRIA4, NMDA receptors GRIN1, GRIN2b, and SLC4A7.
“Validating our approach, downregulated proteins included the wellestablished Retromer cargo glucose transporter-1 (GLUT1/SLC2A1) [29], the ionotropic glutamate AMPA receptors (GRIA2, GRIA3, GRIA4) and NMDA receptors (GRIN1, GRIN2b) [80][81][82][83][84][85], as well as many other previously identified proteins including the sodium bicarbonate cotransporter-3 (SLC4A7) (Figure 1D, Supplementary Table”
From Global identification of neuronal and astrocytic integral membrane proteins that require Retromer for their endosomal recycling (2026) · cites this paper as [85]
The Results section, “The retromer regulates GLR-1 recycling” (page unavailable), reports that vps-35 mutants had fewer and less intense GLR-1 puncta, supporting a retromer-dependent effect on a C. elegans AMPA-type receptor. It does not establish decreased surface levels of the named GRIA or GRIN subunits, GLUT1/SLC2A1, or SLC4A7. In the citing sentence, this source is cited alongside other papers for the glutamate-receptor portion, not specifically for GLUT1. (LLM, conf=0.88)
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PKA phosphorylation of AMPA receptor subunits controls synaptic trafficking underlying plasticity
Esteban, J. A., Shi, S.-H., Wilson, C., Nuriya, M., Huganir, R. L., & Malinow, R. (2003) · Nature Neuroscience · doi:10.1038/nn997 · Cited by 894
Recycling Endosomes Supply AMPA Receptors for LTP
Park, M., Penick, E. C., Edwards, J. G., Kauer, J. A., & Ehlers, M. D. (2004) · Science · doi:10.1126/science.1102026 · Cited by 730
Subunit-specific temporal and spatial patterns of AMPA receptor exocytosis in hippocampal neurons
Passafaro, M., Piëch, V., & Sheng, M. (2001) · Nature Neuroscience · doi:10.1038/nn0901-917 · Cited by 655
AMPA Receptor Incorporation into Synapses during LTP: The Role of Lateral Movement and Exocytosis
Makino, H., & Malinow, R. (2009) · Neuron · doi:10.1016/j.neuron.2009.08.035 · Cited by 501
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Metadata
- Authors
- Zhang, D., Isack, N. R., Glodowski, D. R., Liu, J., Chen, C. C.-H., Xu, X. Z. S., Grant, B. D., & Rongo, C.
- Venue
- Journal of Cell Biology
- Publisher
- Rockefeller University Press
- Published
- 2012-01-02
- Volume
- 196
- Issue
- 1
- Pages
- 85-101
- ISSN
- 1540-8140
- 0021-9525
- PMC
- PMC3255976
- Cited by
- 66
- References
- 4
- Language
- en
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