Developmental profile of visual cortex astrocytes
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Bibliographic record
Abstract
By sensing neuronal signalling, astrocytes release gliotransmitters triggered by intracellular calcium (Ca2 ) transients. This is involved in the regulation of synaptic plasticity. To improve our understanding of layer-5 (L5) neocortical astrocytes in mouse visual cortex, we investigate their developmental profile between postnatal days (P) 9 - 22. Using 2-photon microscopy in acute slices, astrocytes were targeted for patching with Sulforhodamine 101. L5 astrocyte Vm was -82 ± 0.4 mV and Rinput was 34 ± 2 MΩ (n = 127). Over the ages P9-22, Vm increased (Pearson's r = 0.271, p < 0.01) and Rinput decreased (r = -0.189, p < 0.05). Within L5, astrocytes exhibited diverse electrophysiological responses due to voltage steps. Hierarchical clustering indicated two or possibly more response classes, with one class showing a steady, time-invariant conductance and the others a slowly activating component. This slowly activating conductance vanished with age (Spearman's rho = -0.44, p < 0.05, n = 22). We next investigated the development of spontaneous Ca2 transients, visualized with Fluo-5F (200 µM) or AAV-GCaMP6f. We found that Ca2 transients in different compartments of an astrocyte decorrelated with age (r = -0.57, p < 0.01, n = 20), which might be explained by development and maturation of processes. Gap-junction coupling and morphological reconstructions over development were also investigated using Alexa 488 loading. This study provides a foundation for our future work to understand how astrocytes in visual cortex L5 regulate neocortical plasticity at excitatory synapses.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.000 | 0.002 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.017 | 0.002 |
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