Scholarlink

Rationale <p>There is growing interest in the therapeutic utility of psychedelic compounds that act as serotonin-2&#xa0;A receptor (5-HT<sub>2A</sub>) agonists. <i>N</i>,<i>N</i>-dimethyltryptamine (DMT) is a 5-HT<sub>2A</sub> agonist that produces intense and short-lived psychedelic subjective effects, but the compound requires non-oral routes of administration that bypass gastrointestinal metabolism.</p> Objectives <p>Intranasal (IN) delivery of DMT represents one potential non-oral route of administration, but the feasibility of using this route is not well studied. Here, we examined the pharmacodynamic effects and plasma pharmacokinetics of DMT after IN and subcutaneous (SC) administration in rats.</p> Methods <p>Male Sprague-Dawley rats fitted with intravenous (IV) catheters and SC temperature transponders received DMT fumarate (1, 3, or 10&#xa0;mg/kg) or saline vehicle by IN or SC routes. Blood samples were withdrawn via catheters at various times after treatment, with behavioral scores and body temperatures measured prior to each blood draw. Plasma DMT and its <i>N</i>-oxide metabolite were quantified using liquid chromatography tandem quadrupole mass spectrometry (LC-QQQ-MS).</p> Results <p>DMT produced a similar spectrum of pharmacodynamic effects after both routes, including increases in flat body posture and decreases in core body temperature. DMT displayed more rapid pharmacokinetics after the IN route (t<sub>1/2</sub> range = 11.9–14.3&#xa0;min) when compared to the SC route (t<sub>1/2</sub> range = 45.5–122.7&#xa0;min), and peak drug concentrations were greater with IN delivery.</p> Conclusions <p>Our findings show the feasibility of using IN administration to deliver DMT in a reproducible and non-invasive manner. Importantly, the maximal DMT concentrations in rats given low IN doses (i.e., 30.2–55.6 ng/mL DMT) overlap with those reported in humans receiving psychoactive doses.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Pharmacodynamic effects and plasma pharmacokinetics of N, N-dimethyltryptamine after intranasal versus subcutaneous administration in male rats

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月15日

查看全文
  • Michael H. Baumann,
  • Grant C. Glatfelter,
  • Sara E. Walton,
  • Alex J. Krotulski,
  • Christopher G. Witowski,
  • Jacqueline L. von Salm

摘要

Rationale

There is growing interest in the therapeutic utility of psychedelic compounds that act as serotonin-2 A receptor (5-HT2A) agonists. N,N-dimethyltryptamine (DMT) is a 5-HT2A agonist that produces intense and short-lived psychedelic subjective effects, but the compound requires non-oral routes of administration that bypass gastrointestinal metabolism.

Objectives

Intranasal (IN) delivery of DMT represents one potential non-oral route of administration, but the feasibility of using this route is not well studied. Here, we examined the pharmacodynamic effects and plasma pharmacokinetics of DMT after IN and subcutaneous (SC) administration in rats.

Methods

Male Sprague-Dawley rats fitted with intravenous (IV) catheters and SC temperature transponders received DMT fumarate (1, 3, or 10 mg/kg) or saline vehicle by IN or SC routes. Blood samples were withdrawn via catheters at various times after treatment, with behavioral scores and body temperatures measured prior to each blood draw. Plasma DMT and its N-oxide metabolite were quantified using liquid chromatography tandem quadrupole mass spectrometry (LC-QQQ-MS).

Results

DMT produced a similar spectrum of pharmacodynamic effects after both routes, including increases in flat body posture and decreases in core body temperature. DMT displayed more rapid pharmacokinetics after the IN route (t1/2 range = 11.9–14.3 min) when compared to the SC route (t1/2 range = 45.5–122.7 min), and peak drug concentrations were greater with IN delivery.

Conclusions

Our findings show the feasibility of using IN administration to deliver DMT in a reproducible and non-invasive manner. Importantly, the maximal DMT concentrations in rats given low IN doses (i.e., 30.2–55.6 ng/mL DMT) overlap with those reported in humans receiving psychoactive doses.