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RasGRP1 promotes amphetamine-induced motor behavior through a Rhes interaction network ("Rhesactome") in the striatum
Neelam Shahani1, Supriya Swarnkar1, Vincenzo Giovinazzo2
1Department of Neuroscience, The Scripps Research Institute, Jupiter, FL 33458, USA.
Science Signaling
|December 1, 2016
Summary
Researchers discovered that RasGRP1 influences striatal motor control by stabilizing Rhes, a protein involved in neurological disorders. This finding offers new therapeutic targets for conditions like Parkinson's and ADHD.
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- The striatum is crucial for motor control.
- Dopamine signaling in the striatum is implicated in neurodegenerative diseases like Huntington's (HD) and Parkinson's (PD).
- Amphetamines affect striatal dopamine release but have side effects; Rhes protein regulates dopaminergic signaling and is linked to HD and motor control.
Purpose of the Study:
- To investigate the role of RasGRP1 in Rhes-mediated striatal motor control.
- To explore the molecular mechanisms by which RasGRP1 interacts with Rhes.
- To identify novel Rhes-interacting proteins and their potential roles in neurological disorders.
Main Methods:
- Utilized mouse models with varying Rhes and RasGRP1 deficiencies.
- Administered amphetamines to assess locomotor responses.
- Performed proteomic analysis to identify Rhes-interacting proteins (the "Rhesactome").
Main Results:
- RasGRP1 was found to inhibit Rhes-mediated control of striatal motor activity by stabilizing Rhes and increasing its synaptic accumulation.
- Mice with partial Rhes deficiency showed an enhanced response to amphetamine, which was reduced by RasGRP1 depletion.
- Proteomic analysis identified key proteins in the Rhesactome, including PDE2A, LRRC7, and DLG2, and revealed RasGRP1's influence on the amphetamine-induced Rhesactome composition.
Conclusions:
- RasGRP1 plays a significant role in regulating striatal motor activity through Rhes.
- The identified Rhes network provides insights into amphetamine's effects on the striatum.
- This research may lead to new therapeutic strategies for neurological and psychological disorders linked to striatal dysfunction.
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