Disrupted astrocyte-neuron glutamine-glutamate cycling in the medial prefrontal cortex contributes to depression-like behaviors
Bibliographic record
Abstract
The regulation of the homeostasis of the glutamate (Glu)-glutamine (Gln) cycle within the medial prefrontal cortex (mPFC) has garnered substantial interest due to its essential role in maintaining normal emotional behaviors. Chronic stress possesses the potential to disrupt the homeostasis of the Glu-Gln cycle, thereby facilitating the onset of depressive behaviors. Nevertheless, the specific roles of individual components within the Glu-Gln cycle in relation to depression-related behaviors remain incompletely understood. This study aims to elucidate the specific roles of each component by implementing a cell- and region-specific conditional knockout (cKO) strategy. To achieve this goal, the genes encoding glutamine synthetase (GS), glutamate transporter 1 (GLT-1), and sodium-coupled neutral amino acid transporters, SNAT-3 and SNAT-5, were selectively ablated within astrocytes. In addition, the genes encoding SNAT-1 and SNAT-2 were specifically eliminated from glutamatergic neurons. A depressive phenotype was observed in the GS and GLT-1 cKO mice, correlated with increased levels of reactive oxygen/nitrogen species (ROS/RNS) within the mPFC, whereas a reduction in Glu-Gln concentrations was uniquely identified in the GS cKO mice. Conversely, mice with cKO for SNAT-1, SNAT-2, SNAT-3, or SNAT-5 neither exhibited observable depressive-like behaviors nor reduced Glu-Gln levels. However, the simultaneous inactivation of either SNAT-1/SNAT-2 or SNAT-3/SNAT-5 induced depressive-like behaviors and reduced Glu-Gln levels. No systemic stress response or inflammatory manifestations were detected in any of the cKO mice. Furthermore, administration of Gln, acknowledged for its antidepressant properties, to GS cKO mice led to the amelioration of both depressive-like behaviors and Glu-Gln concentrations. These findings elucidate distinct and synergistic roles for the components involved in the Glu-Gln cycle in upholding appropriate Glu-Gln levels and mitigating ROS/RNS within the mPFC. Additionally, our cKO mouse models prove to be valuable tools in researching depression, which may aid in the development of new antidepressant treatments.
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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 | 0.001 | 0.002 |
| 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 | 0.002 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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".