Dopamine Transporter as a Marker of Neuroprotection in Methamphetamine-Lesioned Mice Treated Acutely with Estradiol
Bibliographic record
Abstract
Our laboratories have shown the positive effect of estradiol on 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine- and methamphetamine (MA)-induced striatal dopamine (DA) depletion. Most studies on E neuroprotection use chronic administration of the steroid to evaluate its beneficial effect. In the present report, we investigated the neuroprotective potential of 17 beta-estradiol-3-benzoate (E) under acute conditions when administered 24, 12 or 0.5 h before MA. The effects of E on striatal DA and dihydroxyphenylacetic acid (DOPAC) contents, and DA transporter (DAT) protein and mRNA were measured using high-performance liquid chromatography, autoradiography and in situ hybridization, respectively. We observed neuroprotection with an acute dose of E, and also that protection presents a different time course for each dopaminergic marker. DAT mRNA responded more quickly to E than its protein (at 0.5 h vs. 24 h). Also, E treatment 12 h prior to MA resulted in 'normal' (equal to control) DA content, while DAT protein was still decreased as compared to control values. These different responses for each marker may represent different mechanisms of action of E (genomic versus nongenomic). Since most experimental studies use DA content as the sole indicator of nigrostriatal toxicity and examine a single time point following chronic E administration, the present results demonstrate the importance of evaluating differences in temporally dependent responses of DA, DAT protein and mRNA, to achieve a more comprehensive indication of the nigrostriatal state and the means by which E can function as a neuroprotectant in this system.
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How this classification was reachedexpand
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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".