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Differential effects of L-type calcium channel blockers and stimulants on naloxone-precipitated withdrawal in mice acutely dependent on morphine

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Abstract

The effects of L-type calcium channel blockers and stimulants on naloxone-precipitated withdrawal in miceacutely dependent on morphine were evaluated. Verapamil (10–80 mg/kg), diltiazem (20–120 mg/kg) and nicardipine (20–160 mg/kg), when administered subcutaneously, produced a dose-dependent reduction in forepaw tremor and weight loss during the abstinence reaction; jumping was also reduced by all three drugs, although the effect was not statistically significant in the case of nicardipine. By contrast, the calcium agonist Bay K 8644 (0.5–2 mg/kg, SC) increased forepaw tremor and weight loss, although this latter effect did not reach statistical significance. The effects of the calcium channel active drugs on the rotarod test were also explored, no correlation appearing with the results observed in abstinence (except for the jumping response), which suggests that the withdrawal results are not influenced by motor incoordination or unspecific CNS depression. These findings suggest that L-type calcium channels probably play an important role in withdrawal after acute morphine dependence. Taken together with other observations in chronic models, these results show that calcium channels are similarly involved in morphine abstinence after acute and chronic dependence, in contrast to the differences in the content and uptake of neuronal calcium induced by morphine under both conditions.

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Barrios, M., Baeyens, J.M. Differential effects of L-type calcium channel blockers and stimulants on naloxone-precipitated withdrawal in mice acutely dependent on morphine. Psychopharmacology 104, 397–403 (1991). https://doi.org/10.1007/BF02246042

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