Chemical Biology Research Branch

Bethesda, MD, United States

Chemical Biology Research Branch

Bethesda, MD, United States
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Cheng K.,Chemical Biology Research Branch | Lee Y.S.,U.S. National Institutes of Health | Rothman R.B.,U.S. National Institutes of Health | Dersch C.M.,U.S. National Institutes of Health | And 3 more authors.
Journal of Medicinal Chemistry | Year: 2011

Conformational restraint in the N-substituent of enantiomeric 5-(3-hydroxyphenyl)morphans was conferred by the addition of a cyclopropane ring or a double bond. All of the possible enantiomers and isomers of the N-substituted compounds were synthesized. Opioid receptor binding assays indicated that some of them had about 20-fold higher μ-affinity than the compound with an N-phenylpropyl substituent (Ki = 2-450 nM for the examined compounds with various N-substituents). Most of the compounds acted unusually as inverse agonists in the [35S]GTP-γ-S functional binding assay using nondependent cells that stably express the cloned human μ-opioid receptor. Two of the N-substituted compounds with a cyclopropane ring were very potent μ-opioid antagonists ((+)-29, Ke = 0.17 and (-)-30, Ke =0.3) in the [35S]GTP-γ-S functional binding assay. By comparison of the geometry-optimized structures of the newly synthesized compounds, an attempt was made to rationalize their μ-opioid receptor affinity in terms of the spatial position of N-substituents. © This article not subject to U.S. Copyright. Published 2011 by the American Chemical Society.

Li F.,Chemical Biology Research Branch | Deck J.A.,Chemical Biology Research Branch | Dersch C.M.,U.S. National Institute on Drug Abuse | Rothman R.B.,U.S. National Institute on Drug Abuse | And 3 more authors.
European Journal of Medicinal Chemistry | Year: 2012

Oxide-bridged phenylmorphans were conceptualized as topologically distinct, structurally rigid ligands with 3-dimensional shapes that could not be appreciably modified on interaction with opioid receptors. An enantiomer of the N-phenethyl-substituted ortho-f isomer was found to have high affinity for the μ-receptor (Ki = 7 nM) and was about four times more potent than naloxone as an antagonist. In order to examine the effect of introduction of a small amount of flexibility into these molecules, we have replaced the rigid 5-membered oxide ring with a more flexible 6-membered carbon ring. Synthesis of the new N-phenethyl-substituted tricyclic N-substituted-2,3,4,9,10,10a- hexahydro-1H-1,4a-(epiminoethano)phenanthren-6- and 8-ols resulted in a two carbon-bridged relative of the f-isomers, the dihydrofuran ring was replaced by a cyclohexene ring. The carbocyclic compounds had much higher affinity and greater selectivity for the μ-receptor than the f-oxide-bridged phenylmorphans. They were also much more potent μ-antagonists, with activities comparable to naltrexone in the [35S]GTP-γ-S assay. © 2012 Elsevier Masson SAS. All rights reserved.

Kim J.-H.,Chemical Biology Research Branch | Deschamps J.R.,Center for Biomolecular Science and Engineering | Rothman R.B.,Chemical Biology Research Branch | Dersch C.M.,Chemical Biology Research Branch | And 4 more authors.
Bioorganic and Medicinal Chemistry | Year: 2011

A new synthesis of N-methyl and N-phenethyl substituted ortho-c and para-c oxide-bridged phenylmorphans, using N-benzyl- rather than N-methyl-substituted intermediates, was used and the pharmacological properties of these compounds were determined. The N-phenethyl substituted ortho-c oxide-bridged phenylmorphan(rac-(3R,6aS,11aS)-2-phenethyl-2,3,4,5,6,11a-hexahydro-1H-3, 6a-methanobenzofuro[2,3-c]azocin-10-ol (12)) was found to have the highest μ-opioid receptor affinity (Ki = 1.1 nM) of all of the a- through f-oxide-bridged phenylmorphans. Functional data ([35S]GTP-γ-S) showed that the racemate 12 was more than three times more potent than naloxone as an μ-opioid antagonist. © 2011 Elsevier Ltd. All rights reserved.

Fantegrossi W.E.,University of Arkansas for Medical Sciences | Gannon B.M.,University of Arkansas for Medical Sciences | Zimmerman S.M.,University of Arkansas for Medical Sciences | Rice K.C.,Chemical Biology Research Branch
Neuropsychopharmacology | Year: 2013

In recent years, synthetic analogues of naturally occurring cathinone have emerged as psychostimulant-like drugs of abuse in commercial 'bath salt' preparations. 3,4-Methylenedioxypyrovalerone (MDPV) is a common constituent of these illicit products, and its structural similarities to the more well-known drugs of abuse 3,4-methylenedioxymethamphetamine (MDMA), and methamphetamine (METH) suggest that it may have similar in vivo effects to these substances. In these studies, adult male NIH Swiss mice were trained to discriminate 0.3 mg/kg MDPV from saline, and the interoceptive effects of a range of substitution doses of MDPV, MDMA, and METH were then assessed. In separate groups of mice, surgically implanted radiotelemetry probes simultaneously monitored thermoregulatory and locomotor responses to various doses of MDPV and MDMA, as a function of ambient temperature. We found that mice reliably discriminated the MDPV training dose from saline and that cumulative doses of MDPV, MDMA, and METH fully substituted for the MDPV training stimulus. All three drugs had similar ED 50 values in this procedure. Stimulation of motor activity was observed following administration of a wide range of MDPV doses (1-30 mg/kg), and the warm ambient temperature potentiated motor activity and elicited profound stereotypy and self-injurious behavior at 30 mg/kg. In contrast, MDPV-induced hyperthermic effects were observed in only the warm ambient environment. This pattern of effects is in sharp contrast to MDMA, where ambient temperature interacts with thermoregulation, but not locomotor activity. These studies suggest that although the interoceptive effects of MDPV are similar to those of MDMA and METH, direct effects on thermoregulatory processes and locomotor activity are likely mediated by different mechanisms than those of MDMA. © 2013 American College of Neuropsychopharmacology. All rights reserved.

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