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* National Institute of Mental Health Psychoactive Drug Screening
Program, and Departments of Edited by Erminio Costa, University of Illinois, Chicago, IL, and
approved July 9, 2002 (received for review April 18, 2002)
Salvia divinorum, whose main active ingredient is
the neoclerodane diterpene Salvinorin A, is a hallucinogenic
plant in the mint family that has been used in traditional spiritual
practices for its psychoactive properties by the Mazatecs of Oaxaca,
Mexico. More recently, S. divinorum extracts and
Salvinorin A have become more widely used in the U.S. as legal
hallucinogens. We discovered that Salvinorin A potently and selectively
inhibited 3H-bremazocine binding to cloned
Neurobiology
Salvinorin A: A potent naturally occurring nonnitrogenous
opioid selective agonist
,
,§,¶,
,
,
, and
Biochemistry,
Psychiatry, § Neurosciences, and

Pharmacology and Nutrition, Case Western Reserve
University Medical School, Cleveland, OH 44106;
§§ Clinical Psychopharmacology Section, Intramural
Research Program, National Institute on Drug Abuse, National Institutes
of Health, Baltimore, MD 21224;
Department of
Medicinal Chemistry, Medical College of Virginia, Richmond, VA 23298;
** The Salvia divinorum Research and Information
Center, Malibu, CA 90263; and 
Laboratory of
Medicinal Chemistry, National Institute of Diabetes and Digestive and
Kidney Diseases, National Institutes of Health, Bethesda, MD 20892
opioid
receptors. Salvinorin A had no significant activity against a battery
of 50 receptors, transporters, and ion channels and showed a
distinctive profile compared with the prototypic hallucinogen lysergic
acid diethylamide. Functional studies demonstrated that Salvinorin A is
a potent
opioid agonist at cloned
opioid receptors expressed in
human embryonic kidney-293 cells and at native
opioid receptors
expressed in guinea pig brain. Importantly, Salvinorin A had no actions at the 5-HT2A serotonin receptor, the principal molecular
target responsible for the actions of classical hallucinogens.
Salvinorin A thus represents, to our knowledge, the first
naturally occurring nonnitrogenous opioid-receptor subtype-selective
agonist. Because Salvinorin A is a psychotomimetic selective for
opioid receptors,
opioid-selective antagonists may represent novel
psychotherapeutic compounds for diseases manifested by perceptual
distortions (e.g., schizophrenia, dementia, and bipolar disorders).
Additionally, these results suggest that
opioid receptors play a
prominent role in the modulation of human perception.
¶
To whom reprint requests should be addressed. E-mail:
roth{at}biocserver.cwru.edu.
www.pnas.org/cgi/doi/10.1073/pnas.182234399
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