Functional Changes to the Modulation of α4β2* Nicotinic Acetylcholine Receptors during Postnatal Maturation
Bibliographic record
Abstract
The neurotransmitter acetylcholine (ACh) acting at its α4β2* subtype of nicotinic acetylcholine receptor (nAChR) within the cerebral cortex plays an important role to support cognitive functions. ACh normally initiates a robust excitatory response at α4β2* nAChRs, although this activity may be modulated by a number of mechanisms that alter receptor function. Negative receptor modulation may occur via desensitization by the competitive agonist nicotine or via presumed negative allosteric modulation by the endogenous progesterone‐derived neurosteroid 3α‐hydroxy‐5α‐prenan‐20‐one (allopregnanolone; ALLO). Conversely, positive modulation may occur via positive allosteric modulation by the alkaloid galantamine. Although each form of modulation has been demonstrated to occur in α4β2* nAChRs located on pyramidal neurons within layer VI of the medial prefrontal cortex (mPFC) in young postnatal male mice, the presence and relative strength of modulation in young postnatal female mice, and at maturity for both sexes, is unclear. Using whole‐cell electrophysiology in mFPC layer VI neurons, we measured the ability of nicotine (300 nM), ALLO (10 μM), and galantamine (0.1 μM) to modulate ACh activation of α4β2* nAChRs in male and female mice at postnatal day (P)15‐20 (young postnatal age) and P80‐120 (adulthood). For nicotine, nAChR desensitization at P15‐20 was greater than at P80‐120 and this result was driven by an effect of postnatal age in male mice only. In contrast, ALLO inhibited nAChR function to a similar degree at both P15‐20 and P80‐120. Galantamine potentiated nAChR function to a similar degree at both P15 and P80‐120, although this potentiation was significantly greater in females than in males at each age. Results from this study suggest that distinct factors are involved in each type of receptor modulation, which are differentially altered during postnatal maturation and across biological sex. Future studies will focus on mechanisms by which these factors influence the modulation of α4β2* nAChRs during postnatal maturation.
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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) | 0.000 | 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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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".