The role of glutamate co-transmission by serotonin neurons of the dorsal raphe nucleus in the expression of L-Dopa-induced dyskinesia
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Bibliographic record
Abstract
Parkinson's disease is characterized by the progressive loss of midbrain dopaminergic neurons that innervate the striatum. The dopamine precursor (L-Dopa) is the most effective pharmacotherapy but its chronic use is hampered by adverse effects such as abnormal involuntary movements (AIMs), also termed L-Dopa-induced dyskinesia (LID). Recent studies have shown the crucial role of serotonin (5-HT) neurons in LID expression. Through this study, we specifically addressed the functional role of glutamate co-transmission by 5-HT neurons of the dorsal raphe nucleus (DRN) in the regulation of many diverse behaviors and LID expression. We used CRIPSR-Cas9 technology and viral injections to knock-out or overexpress the vesicular glutamate transporter 3 (VGluT3), specifically in 5-HT neurons of the DRN in adult mice. After extensive behavioral testing, these mice were injected with 6-OHDA in the medial forebrain bundle to selectively lesion DA axons, and then treated with L-Dopa to induce AIMs. RNAscope and immunohistochemistry confirm the depletion or overexpression of VGluT3 in AAV-infected 5-HT neurons of the DRN. VGluT3-depleted mice show a loss of motor coordination but an increase of spontaneous activity, a higher impulsivity level and a slight increase in sociability and anxiety. While mice overexpressing VGluT3 exhibit solely a slight decrease of the motivation. After dopamine lesion and L-Dopa administration, VGluT3-depleted mice present exacerbated AIMs caused by L-Dopa administration at low dose, while mice overexpressing VGluT3 manifest worsen orolingual AIMs at higher dose. Glutamate that is co-released by 5-HT neurons of the DRN appears to be involved in the regulation of motor behaviors, impulsivity, anxiety, and sociability, as well as in the expression of LID.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.003 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.003 |
| Science and technology studies | 0.000 | 0.003 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.004 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it