446. ANTIDEPRESSANT ACTIVITY OF STRATEGIC ELECTRICAL STIMULATION OF PREFRONTOCORTICAL NEURONS PRIMED FOR EXCITABILITY
Bibliographic record
Abstract
Abstract Background Major depressive disorder is a severe and pervasive mental health condition that significantly disrupts the well-being and daily functioning of those affected. Despite the availability of various treatment options, their efficacy is often hampered by limited response rates and the presence of adverse side effects, leaving a considerable need for alternative approaches. Advances in neurostimulation technology have emerged as a potential breakthrough in depression treatment, but further research is required to fine-tune these methods and uncover the biological mechanisms underlying their effects. Aims & Objectives This study explores the potential of a novel therapeutic strategy that combines transcranial direct current stimulation (tDCS) with a chemical approach to enhance neuronal excitability (EC stimulation). Method The proposed therapeutic strategy employs NS8593, an antagonist of small-conductance, calcium-activated potassium channels, to prime neurons for excitability. Initial experiments determined subthreshold doses for both tDCS (0.05mA) and NS8593 (1.0mg/kg) individually, neither of which produced measurable behavioral or neurochemical effects in rats. These subthreshold interventions were then combined into a single treatment, referred to as EC stimulation, and assessed in a series of behavioral experiments using the olfactory bulbectomy (OBX) rat model of depression. Results The results demonstrated that EC stimulation effectively reversed hyperactivity induced by OBX in the open field test and reduced anxiety-like behaviors observed in the open field and novelty-suppressed feeding tests, which were otherwise seen with tDCS alone. These behavioral improvements correlated with increased serotonin (5-HT) turnover in the left prefrontal cortex and hippocampus, as evidenced by lower total 5-HT levels and higher levels of its metabolite, 5-HIAA. Furthermore, the combination therapy prevented the rise in hippocampal dopamine levels observed with either tDCS or NS8593 when administered separately. Discussion & Conclusions With depression rates continuing to rise globally, there is an urgent need for innovative treatment strategies that are both effective and safe. The findings of this research highlight the promise of EC stimulation as a potential therapeutic option and underscore the importance of further preclinical studies to advance its development.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".