Precipitated diazepam withdrawal elevates noradrenergic metabolism in primate brain

Area of Science:

• Neuroscience
• Pharmacology
• Behavioral Science

Background:

• Benzodiazepines are commonly prescribed for anxiety and insomnia.
• Abrupt cessation of benzodiazepines can lead to withdrawal syndromes.
• The neurobiological mechanisms underlying benzodiazepine withdrawal are not fully understood.

Purpose of the Study:

• To investigate the role of central noradrenergic activity in diazepam withdrawal.
• To examine the effects of a benzodiazepine receptor antagonist on withdrawal symptoms and neurochemistry.

Main Methods:

• Vervet monkeys were treated with diazepam for seven days.
• A benzodiazepine receptor antagonist, RO 15-1788, was administered.
• Behavioral withdrawal symptoms and brain concentrations of the noradrenergic metabolite MHPG were measured.

Main Results:

• RO 15-1788 precipitated a severe withdrawal syndrome in diazepam-treated monkeys.
• Brain MHPG levels were significantly elevated in the precipitated withdrawal group.
• RO 15-1788 alone did not induce withdrawal or alter MHPG levels, but increased scratching.

Conclusions:

• Increased central noradrenergic activity may play a role in benzodiazepine withdrawal.
• These findings suggest a parallel between benzodiazepine and opiate withdrawal mechanisms.
• Further research is warranted to explore noradrenergic pathways in benzodiazepine dependence and withdrawal.