Molecular determinants of opioid analgesia: Modulation of presynaptic calcium channels
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Bibliographic record
Abstract
Abstract Opioid receptor agonists remain one of the most efficacious classes of analgesic drugs available for clinical use. Although multiple subclasses of opioid receptors have been identified (δ, κ, and μ), most opioid analgesics act at the μ receptor subtype to decrease cAMP formation, activate hyperpolarizing K + channels, and inhibit Ca 2+ channels. Here, we discuss the molecular interactions underlying opioid receptor‐mediated modulation of voltage‐dependent calcium channels. Opioid receptor activation results in binding of the G protein βγ complex to specific structural elements of the presynaptic calcium channel. The modulated calcium channel displays characteristic inhibition and kinetic slowing resulting in reduced Ca 2+ influx and diminished release of neurotransmitter. Mounting evidence suggests that desensitization of this opioid response involves regulators of G‐protein signaling (RGS), G‐protein coupled receptor kinases (GRK), and β‐arrestins. Further advances in our understanding of these subcellular events mediating opioid pain relief offer new prospects in the development of improved analgesic agents. Drug Dev. Res. 54:118–128, 2002. © 2002 Wiley‐Liss, Inc.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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 it