Differential effects of the t-type calcium channel antagonist, Z944, on behaviours associated with amphetamine and morphine addiction
Bibliographic record
Abstract
Mixed L-/T-type calcium channel antagonists attenuate morphine- and amphetamine induced conditioned place preference (CPP). Subtype specific antagonists for T-type calcium channels attenuate nicotine-reinforced behaviours in rats. This thesis investigated the effects of a novel T-type calcium channel antagonist, Z944, on the acquisition, expression, and reinstatement of amphetamine and morphine CPP. Furthermore, we examined Z944 for aversive or rewarding properties, and determined changes in locomotion with Z944 alone and in conjunction with amphetamine or morphine. CPP was induced with either morphine (5.0 mg/kg, IP) or amphetamine (1.5 mg/kg, IP) and Z944 (vehicle, 5.0, 7.5 mg/kg, IP) was administered 15 min prior to conditioning sessions for CPP acquisition experiments. For CPP expression experiments, Z944 was administered prior to the test session. In a related experiment Z944 was administered 15 min prior to the reinstatement injection of morphine after a period of extinction. Aversive and rewarding properties of Z944 were evaluated using a CPP/CPA procedure. Z944 dose-dependently attenuated the acquisition of morphine CPP, the expression of amphetamine CPP, and drug-induced reinstatement of both amphetamine and morphine CPP. Further, Z944 alone had no inherent rewarding or aversive effects, despite causing a decrease in spontaneous locomotor activity. It was also revealed that Z944 attenuated amphetamine-induced hyperlocomotion and potentiated morphine-induced hypolocomotion. These results suggest that T-type calcium channel antagonists differentially attenuate behaviours induced by several classes of drugs of abuse.
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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".