Targeting of neurotransmitter receptors to synapses is essential for efficient synaptic transmission and plays an important role in the regulation of synaptic plasticity in the brain. AMPA receptors are the major excitatory neurotransmitter receptors in the central nervous system. We have identified several PDZ domain-containing proteins that specifically interact with AMPA receptors and are critical for the regulation of AMPA receptor membrane trafficking and synaptic plasticity. Several of these proteins, including GRIP1 and GRIP2 (Glutamate Receptor Interacting Proteins) and PICK1 (Protein Interactor with C Kinase), specifically interact with the C-terminal domains of the AMPA receptor subunits. We have found that these interactions are dynamically regulated by protein phosphorylation of the receptor subunits. We have identified additional members of this protein complex, including NSF, GRASP1, KIBRA, WWC2 and SNX27, which are involved in the regulation of AMPA receptor membrane trafficking. Interestingly, genetic variants of these proteins have recently been associated with several cognitive disorders. In this research proposal we plan to use several complementary approaches to further characterize the structure and function of this PDZ based membrane trafficking complex and determine its role in AMPA receptor synaptic targeting, synaptic plasticity and cognitive behavior. In complementary experiments, we will use knockout and knockin mice of this complex to elucidate the role of the PDZ domain-based receptor complexes in several forms of plasticity in the hippocampus, cerebellum, amygdala, somatosensory and visual cortex. Finally, we will analyze behavioral phenotypes, including spatial and motor learning and fear conditioning and extinction, in these knockout and knockin mice to determine the role of these regulatory mechanisms in higher brain processes.

Public Health Relevance

This research will elucidate basic molecular mechanisms that regulate synaptic transmission and plasticity in the brain but it also has broad relevance for many brain disorders. Dysfunction of synaptic transmission and synaptic plasticity underlies many neurological and psychiatric diseases. This research may therefore reveal novel targets for the development of therapeutic treatments for several disorders including pain, drug addiction, schizophrenia, autism, intellectual disability and Alzheimer's and Parkinson's disease.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS036715-20
Application #
9394036
Study Section
Synapses, Cytoskeleton and Trafficking Study Section (SYN)
Program Officer
Whittemore, Vicky R
Project Start
1997-08-01
Project End
2020-12-31
Budget Start
2018-01-01
Budget End
2018-12-31
Support Year
20
Fiscal Year
2018
Total Cost
Indirect Cost
Name
Johns Hopkins University
Department
Neurosciences
Type
Schools of Medicine
DUNS #
001910777
City
Baltimore
State
MD
Country
United States
Zip Code
21205
Lagerlöf, Olof; Hart, Gerald W; Huganir, Richard L (2017) O-GlcNAc transferase regulates excitatory synapse maturity. Proc Natl Acad Sci U S A 114:1684-1689
Diering, Graham H; Nirujogi, Raja S; Roth, Richard H et al. (2017) Homer1a drives homeostatic scaling-down of excitatory synapses during sleep. Science 355:511-515
Chiu, Shu-Ling; Diering, Graham Hugh; Ye, Bing et al. (2017) GRASP1 Regulates Synaptic Plasticity and Learning through Endosomal Recycling of AMPA Receptors. Neuron 93:1405-1419.e8
Lim, Chae-Seok; Kang, Xi; Mirabella, Vincent et al. (2017) BRaf signaling principles unveiled by large-scale human mutation analysis with a rapid lentivirus-based gene replacement method. Genes Dev 31:537-552
Chen, Chih-Ming; Orefice, Lauren L; Chiu, Shu-Ling et al. (2017) Wnt5a is essential for hippocampal dendritic maintenance and spatial learning and memory in adult mice. Proc Natl Acad Sci U S A 114:E619-E628
Nomura, J; Jaaro-Peled, H; Lewis, E et al. (2016) Role for neonatal D-serine signaling: prevention of physiological and behavioral deficits in adult Pick1 knockout mice. Mol Psychiatry 21:386-93
Zeng, Menglong; Shang, Yuan; Araki, Yoichi et al. (2016) Phase Transition in Postsynaptic Densities Underlies Formation of Synaptic Complexes and Synaptic Plasticity. Cell 166:1163-1175.e12
Gu, Yi; Chiu, Shu-Ling; Liu, Bian et al. (2016) Differential vesicular sorting of AMPA and GABAA receptors. Proc Natl Acad Sci U S A 113:E922-31
Gu, Yi; Huganir, Richard L (2016) Identification of the SNARE complex mediating the exocytosis of NMDA receptors. Proc Natl Acad Sci U S A 113:12280-12285
Goldschmidt, Hana L; Tu-Sekine, Becky; Volk, Lenora et al. (2016) DGK? Catalytic Activity Is Required for Efficient Recycling of Presynaptic Vesicles at Excitatory Synapses. Cell Rep 14:200-7

Showing the most recent 10 out of 82 publications