An intravenous self-administration procedure for assessing the reinforcing effects of hallucinogens in nonhuman primates

详细信息    查看全文

• 作者：Amy K. Goodwin¹ ; ^{Amy.Goodwin@FDA.HHS.GOV" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Lysergic acid diethylamide (LSD) ; Abuse liability ; Hallucinogen ; Reinforcing effects ; Intravenous (IV) self-administration ; Operant behavior
• 刊名：Journal of Pharmacological and Toxicological Methods
• 出版年：2016
• 出版时间：November-December 2016
• 年：2016
• 卷：82
• 期：Complete
• 页码：31-36
• 全文大小：411 K

文摘

Self-administration procedures are the gold standard for investigating the reinforcing effects of drugs. The notable exception to good correspondence between laboratory self-administration studies and human drug taking behavior has historically been the classic hallucinogens.

Method

The present study used a well-established daily access procedure, followed by a novel intermittent access procedure, to investigate the reinforcing effects of LSD in baboons.

Results

Rates of self-injection in the daily access procedure were minimal. One baboon self-administered 0.001 mg/kg and a second baboon self-administered 0.0032 mg/kg above vehicle levels, though rates of self-injection were clearly low and neither of the two remaining baboons self-administered any LSD dose tested in the daily access procedure. Rates of self-injection using an intermittent access procedure with discriminative stimuli resulted in two doses of LSD being self-administered above vehicle levels in two of three baboons tested (0.01 and 0.032 mg/kg in one baboon; 0.0032 and 0.01 mg/kg in a second). In addition, the number of self-injections at these doses was higher (range = 3–6 injections) in the intermittent access procedure than in the daily access procedure (range = 1–2 injections).

Discussion

The present study is the first to demonstrate LSD self-administration in a laboratory animal, and though the results are limited, they indicate intermittent access procedures with discriminative stimuli may provide a reliable and valid method for investigating the reinforcing effects of IV self-administered hallucinogens in laboratory animals. The usefulness of such procedures should be further evaluated in a larger number of subjects.