Restoring Cognitive functions: Unveiling the Procognitive and Neurotrophic Impact of Chronic Administration of a Selective A5‐GABAA Receptor Positive Allosteric Modulator in Mouse Models of Amyloid Load and Tau Phosphorylation
Bibliographic record
Abstract
Abstract Background Dysregulated GABA/somatostatin (SST) signaling has been implicated in psychiatric and neurodegenerative disorders. The inhibition of excitatory neurons by SST+ interneurons, particularly through α5‐containing GABAA receptors (α5‐GABAAR), plays a crucial role in mitigating cognitive functions. Previous research demonstrated that an α5‐positive allosteric modulator (α5‐PAM) mitigates working memory deficits and reverses neuronal atrophy in aged mice. Subsequently, we explored the behavioral and neurotrophic effects of this α5‐PAM in animal models reflecting β‐amyloid load and tau phosphorylation, hallmarks of Alzheimer’s disease progression. Method Two studies were conducted with approximately 12 mice per group, including 50% females: 1) 5xFAD transgenic mice exhibiting progressive amyloid‐related cognitive decline; 2) PS19 transgenic mice displaying progressive tau‐tangle‐cognitive decline. Chronic administration of GL‐II‐73 (30mg/kg, p.o, for 4 weeks) was employed to assess its efficacy in rescuing cognitive deficits across three domains. Working memory, spatial memory, and cognitive flexibility were evaluated through an alternation task, water maze, and set‐shifting assay, respectively. Golgi‐Cox staining of brains (n = 4brain/group; 8cell/brain) facilitated the quantification of dendritic length and spine density in the prefrontal cortex and hippocampus using NeuroLucida. In the 5xFAD cohort, the impact of treatment on spine maturation steps was also examined. Result Chronic treatment in both models reversed cognitive deficits across domains (ps<0.01), demonstrating a robust effect on working memory. Furthermore, it significantly mitigated amyloid‐induced and tau‐related dendritic shrinkage and reduction of spine density at apical and basal dendrites (p<0.001 in PFC and CA1). Notably, this effect extended to all maturation steps in the 5xFAD model. Conclusion The findings collectively indicate that selectively targeting α5‐GABAA receptors overcomes amyloid‐ or tau‐related cognitive deficits and neuronal morphology detriments. This marks the first intervention addressing the GABAergic system with both symptomatic and disease‐modifying therapeutic potential across various disorders. This breakthrough suggests a promising avenue for clinical development, offering hope to patients grappling with cognitive deficits across a spectrum of brain disorders.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.001 | 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".