Department of Psychiatry, Affiliated Kangning Hospital of Ningbo University, Ningbo, China.
Key Laboratory of Addiction Research of Zhejiang Province, Ningbo, China.
Addict Biol. 2024 Feb;29(2):e13370. doi: 10.1111/adb.13370.
N-Isopropylbenzylamine (N-ipb), a chain isomer of methamphetamine (METH) with similar physical properties, has been used as a substitute for METH in seized drug samples. However, the abuse potential of N-ipb remains unclear. Therefore, this study aimed to evaluate the abuse potential of N-ipb in comparison to METH, by using conditioned place preference (CPP), locomotor sensitization and intravenous self-administration tests. The results showed that N-ipb at a dose of 3 mg·kg significantly induced CPP in mice, which was comparable to the effect of METH at 1 mg·kg . Either acute or repeated N-ipb injections (1 or 3 mg·kg ) failed to raise the locomotor activity. However, acute treatment with 10 mg·kg N-ipb elevated the locomotor activity compared with saline, while chronic injection of 10 mg·kg N-ipb induced a delayed and attenuated sensitization compared with 1 mg·kg METH. Rats could acquire N-ipb self-administration at a dose of 1 mg·kg ·infusion , and a typical inverted U-shaped dose-response curve was obtained for N-ipb. The mean dose of N-ipb that maintained the maximum response was greater than that of METH, indicating that N-ipb is less potent for reinforcement than METH. In the economic behavioural analysis, comparison of essential values derived from the demand elasticity revealed that N-ipb is less efficacy as a reinforcer than METH. The present data demonstrate that N-ipb functions as a reinforcer and has a potential for abuse. However, the potency of psychomotor stimulation and the reinforcing effectiveness of N-ipb are lower than those of METH.
N-异丙基苯丙胺(N-ipb)是一种与甲基苯丙胺(METH)具有相似物理性质的链异构体,已被用作缉获毒品样本中 METH 的替代品。然而,N-ipb 的滥用潜力尚不清楚。因此,本研究旨在通过条件位置偏好(CPP)、运动敏化和静脉自我给药测试,评估 N-ipb 与 METH 相比的滥用潜力。结果表明,N-ipb 剂量为 3mg·kg 时,可显著诱导小鼠 CPP,与 1mg·kg METH 的效果相当。无论是急性还是重复给予 N-ipb(1 或 3mg·kg ),都未能提高运动活动。然而,10mg·kg N-ipb 急性处理可提高与生理盐水相比的运动活性,而 10mg·kg N-ipb 慢性注射与 1mg·kg METH 相比,诱导迟缓和减弱的敏化。大鼠可在 1mg·kg·infusion 的剂量下摄取 N-ipb 自我给药,并获得 N-ipb 的典型倒 U 形剂量反应曲线。维持最大反应的 N-ipb 平均剂量大于 METH,表明 N-ipb 作为强化剂的效力小于 METH。在经济行为分析中,比较从需求弹性得出的基本值表明,N-ipb 作为强化剂的效力不如 METH。本数据表明,N-ipb 作为一种强化剂具有滥用潜力。然而,N-ipb 的运动刺激效力和强化效果均低于 METH。