Blockade of the expression of mecamylamine-precipitated nicotine withdrawal by calcium channel antagonists
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Mecamylamine
Nicotine withdrawal
Nimodipine
Anxiogenic
Mecamylamine
Nicotine withdrawal
Nimodipine
Anxiogenic
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There is substantial evidence that GABAB agonist, baclofen, prevents somatic and motivational responses induced by nicotine withdrawal and may target drug cue vulnerabilities in humans. In this context, we explored different aspects associated with the possible mechanisms whereby the GABAB receptors might influence nicotine withdrawal. Male mice received nicotine (2.5 mg/kg, s.c.) 4 times daily, for 7 consecutive days. Nicotine-treated mice received the nicotinic acetylcholine receptor antagonist, mecamylamine (MEC, 2 or 3.5 mg/kg, s.c.), to precipitate the withdrawal state. A second group of dependent mice received 2-hydroxysaclofen (GABAB receptor antagonist, 1 mg/kg, s.c.) before MEC-precipitated abstinence. Somatic signs of nicotine withdrawal were measured for 30 min. Anxiogenic-like response associated to nicotine withdrawal was assessed by the elevated plus maze test. The dysphoric/aversive effect induced by nicotine withdrawal was evaluated using conditioned place aversion paradigm. Dopamine, serotonin and its metabolites concentrations were determined by HPLC in the striatum, cortex and hippocampus. Finally, α4β2 nicotinic acetylcholine receptor density was determined in several brain regions using autoradiography assays. The results showed that MEC-precipitated nicotine withdrawal induced somatic manifestations, anxiogenic-like response and dysphoric/aversive effect, and 2-hydroxysaclofen potentiated these behavioral responses. Additionally, 2-hydroxysaclofen was able to change striatal dopamine levels and α4β2 nicotinic acetylcholine receptor density, both altered by MEC-precipitated nicotine withdrawal. These findings provide important contributions to elucidate neurobiological mechanisms implicated in nicotine withdrawal. We suggest that GABAB receptor activity is necessary to control alterations induced by nicotine withdrawal, which supports the idea of targeting GABAB receptors to treat tobacco addiction in humans.
Nicotine withdrawal
Mecamylamine
Anxiogenic
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Nimodipine
Mecamylamine
Cross-tolerance
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Mecamylamine
Nicotine withdrawal
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Mecamylamine
Nicotine withdrawal
Alcohol Dependence
Nicotinic Antagonist
Alcohol withdrawal syndrome
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The nicotine withdrawal syndrome was validated and characterized in the mouse using both somatic and affective measures after infusion with nicotine daily via subcutaneous minipumps. The influence of dose, duration of infusion, and repeated withdrawal as well as the contribution of genetic factors were investigated. We then characterized the contribution of nicotinic receptor and site mechanisms to withdrawal signs using various nicotinic antagonists. Our results showed that spontaneous nicotine withdrawal increased the number of somatic signs, decreased the time spent in open arms of the plus-maze test, and induced hyperalgesia. The effect was dose-dependent in all measures with no significant changes at the lowest dose of nicotine (6 mg/kg/day). Withdrawal signs were prominent shortly after pump removal and remained prominent through day 3 or 4. The results with the different antagonists (mecamylamine, dihydro-β-erythroidine, and methyllycaconitine) suggest the involvement of several nicotinic subtypes such as α3β4*, α4β2*, and α7 in nicotine withdrawal. Increasing the duration of nicotine exposure (from 7 to 60 days) and the total nicotine exposure (increasing doses of infusing) augmented the severity of nicotine withdrawal signs. The withdrawal severity of nicotine differs between C57/BL and 129/SvEv inbred mice with nicotine withdrawal in C57 being more severe than in the 129 strain. In summary, our present results suggest that withdrawal from nicotine can be modulated by genetic factors, daily nicotine intake, duration of nicotine exposure, and withdrawal history. The present study demonstrates that our mouse nicotine withdrawal model will be useful for studying the pharmacological, biochemical, and genetic mechanisms involved in nicotine dependence.
Nicotine withdrawal
Mecamylamine
Methyllycaconitine
Nicotinic Antagonist
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Mecamylamine
Chlorisondamine
Nicotine withdrawal
Abstinence Syndrome
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Anxiogenic
Elevated plus maze
Nimodipine
Flunarizine
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Knockout mouse
Health psychology
Nicotine withdrawal
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