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Published on: August 10, 2012
Subthalamic stimulation increases striatal tyrosine hydroxylase phosphorylation.
Rene Reese1, Christine Winter, Agnes Nadjar
1CNRS UMR 5227, Bordeaux, France.
Neuroreport
|January 11, 2008
Summary
Subthalamic stimulation increases striatal tyrosine hydroxylase activity by enhancing its phosphorylation. This effect, observed shortly after stimulation, suggests a rapid mechanism for modulating dopamine synthesis in the brain.
Area of Science:
- Neuroscience
- Biochemistry
Background:
- Tyrosine hydroxylase activity in the striatum is crucial for dopamine synthesis.
- This activity is regulated by phosphorylation at specific serine residues.
- Subthalamic stimulation is a potential therapeutic intervention for neurological disorders.
Purpose of the Study:
- To investigate the effect of subthalamic stimulation on striatal tyrosine hydroxylase phosphorylation.
- To determine if subthalamic stimulation alters tyrosine hydroxylase protein content.
Main Methods:
- Western blotting was used to analyze tyrosine hydroxylase phosphorylation at serine residues 19, 31, and 40.
- Striatal tissue from rats subjected to subthalamic or sham stimulation was examined.
Main Results:
- Subthalamic stimulation increased phosphorylation at serine residue 19 in tyrosine hydroxylase.
- Phosphorylation at serine residues 31 and 40 showed a trend towards increase.
- Tyrosine hydroxylase protein content remained unchanged immediately and 24 hours after stimulation.
- No significant changes in phosphorylation or protein content were observed 24 hours post-stimulation.
Conclusions:
- Subthalamic stimulation rapidly enhances striatal tyrosine hydroxylase activity through increased phosphorylation.
- The observed changes in phosphorylation are transient, returning to baseline levels within 24 hours.
