Neuregulin-1/ErbB activity in hippocampal plasticity and psychopathology
Why this work is in the frame
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Bibliographic record
Abstract
We initially sought to examine the effects of neuregulin-1 (NRG1) administration on adult hippocampal neuroplasticity, and determined that this paradigm increases cell proliferation and neurogenesis in the ventral (but not dorsal) hippocampus. This neurogenic increase was accompanied by antidepressant-like behaviour that was present when these cells became functional neurons, but not acutely after administration. We also identified ErbB3 as a candidate mechanistic receptor in this phenomenon. Next we completed our characterization of the neurogenic effects of NRG1, and determined that they are limited to proliferation and neurogenesis in the ventral hippocampus. We also discovered morphological differences between immature neurons in the dorsal and ventral dentate gyrus (DG). Having determined that NRG1-ErbB3 signaling has antidepressant-like properties, we then sought to investigate whether the converse was also true, in that psychopathological samples and animal models might show deficits in NRG1-ErbB3 signaling. As hypothesized, we found decreased hippocampal ErbB3 expression in suicide completers, as well as deficits in anterior DG granule neurons (which we and others show ubiquitously express ErbB3), with the latter phenotype being reversed with antidepressant treatment, as well as cell body hypertrophy in the posterior DG granule cell layer. Together these results identify a pathway that is putatively involved in both psychopathology and its amelioration, ostensibly through its effects in the DG.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.002 |
| 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 it