Assessing the effects of chronic sazetidine-A delivery on nicotine self-administration in both male and female rats

作者：Johnson Joshua E; Slade Susan; Wells Corinne; Petro Ann; Sexton Hannah; Rezvani Amir H; Brown Milton L; Paige Mikell A; McDowell Brian E; Xiao Yingxian; Kellar Kenneth J; Levin Edward D^*

来源：Psychopharmacology, 2012, 222(2): 269-276.

DOI：10.1007/s00213-012-2642-z

• Nicotine
• Sazetidine-A
• Chronic
• Self-administration
• Sex differences

Sazetidine-A is a selective alpha 4 beta 2 nicotinic receptor desensitizing agent and partial agonist. It has been shown in previous studies to significantly reduce nicotine self-administration in rats after acute or repeated injections. However, the effects of continuous chronic infusions of sazetidine-A on maintenance of nicotine self-administration and relapse after abstinence have yet to be examined. %26lt;br%26gt;This study evaluated the efficacy of continuous sazetidine-A infusions (sc) over a period of 4 weeks to reduce nicotine self-administration in male and female Sprague-Dawley rats. %26lt;br%26gt;Sazetidine-A was administered via Alzet osmotic minipumps to young adult female and male rats at doses of 0, 2 or 6 mg/kg/day for 4 weeks. The effects of sazetidine-A on IV nicotine self-administration were examined in repeated 3-h sessions over the first 2 weeks of infusion followed by 1 week of forced abstinence from nicotine and 1 week of resumed nicotine access. %26lt;br%26gt;The 6 mg/kg/day sazetidine-A dose significantly reduced overall nicotine self-administration compared with vehicle control across the sessions for both male (p %26lt; 0.001) and female (p %26lt; 0.05) rats. The lower 2 mg/kg/day sazetidine-A infusion dose was effective in reducing nicotine self-administration for male (p %26lt; 0.001), but not female rats. No attenuation in sazetidine-A effectiveness was seen over the course of the 4-week treatment. In the vehicle control group, male rats self-administered significantly (p %26lt; 0.001) more nicotine than females. %26lt;br%26gt;The continuing effectiveness of sazetidine-A in reducing nicotine self-administration in both male and female rats supports its promise as a new treatment to help people successfully quit smoking.

• 出版日期2012-7