FDA-Approved Parkinson's Drug Could Alleviate Nicotine Withdrawal Symptoms

The World Health Organization (WHO) reports that more than 22% of the world's population smokes, leading to over 9 million deaths each year due to smoking-related causes. Effective treatments to ease nicotine withdrawal symptoms are crucial for successful quitting. While Bupropion and Varenicline are currently approved treatments for nicotine withdrawal, there is an urgent need for new therapeutic options to enhance the success rates of smoking cessation (1^✔ ✔Trusted Source
Overcoming nicotine withdrawal: Clues found in neural mechanisms of the brain

Go to source). The research team led by Dr. Heh-In Im at the Center for Brain Disorders of the Korea Institute of Science and Technology (KIST) has identified a novel brain region and neural mechanism involved in regulating nicotine withdrawal symptoms. Building on this discovery, the team found that an existing Parkinson's disease drug can effectively alleviate nicotine withdrawal symptoms, thus increasing its potential for therapeutic use.

The Impact of Nicotine Withdrawal on the Brain

When smoking is stopped, specific areas of the brain become hyperactive, causing physical withdrawal symptoms such as tremors and reduced activity. These symptoms significantly disrupt daily life and are major factors leading smokers to relapse. Therefore, understanding the internal processes triggered by nicotine withdrawal is crucial for achieving smoking cessation.

The research team pinpointed the role of striatal cholinergic interneurons in nicotine withdrawal symptoms. Through experiments on mice, they selectively inhibited sodium channel expression in the striatal cholinergic interneurons to reduce neural activity. This intervention significantly alleviated tremors caused by nicotine withdrawal. Using advanced multi-electrode array technology, the team confirmed that suppressing cholinergic interneurons completely blocked abnormal neural activity changes.

Procyclidine as a Treatment for Nicotine Withdrawal

Additionally, microdialysis experiments showed that suppressing cholinergic interneurons restored dopamine levels in the striatum, which had decreased by over 20% during nicotine withdrawal, to normal levels. Based on these findings, the team explored the potential use of Procyclidine, an FDA-approved drug for Parkinson’s disease, for nicotine withdrawal treatment. Procyclidine mimics the inhibition effect on the neural activity of cholinergic interneurons, making it a promising candidate for alleviating physical symptoms of nicotine withdrawal.

Improving Access to Effective Smoking Cessation Treatments

Notably, administering a single low dose of Procyclidine to mice prior to inducing nicotine withdrawal reduced tremors—a primary physical withdrawal symptom—by over 50%. This study demonstrates the potential of repurposing a safe and established drug for nicotine withdrawal treatment, significantly shortening the clinical trial process. This approach could improve access to smoking cessation therapies and effectively reduce health issues caused by smoking.

Dr. Im stated, “This study presents new possibilities for smoking cessation treatment by mitigating the disruptions caused by withdrawal symptoms. It provides an additional treatment option alongside Bupropion and Varenicline. Moving forward, we aim to deepen our understanding of addiction mechanisms, including nicotine, and develop effective therapies.”

Reference:

1. Overcoming nicotine withdrawal: Clues found in neural mechanisms of the brain - (https://www.eurekalert.org/news-releases/1073126)

Source-Eurekalert