The aim of this proposal is to discover the underlying basis for the devastating effect of new drugs entering the illicit market. What makes the project especially interesting is that these new drugs are structurally related to the well-known drugs, amphetamine and methamphetamine (AMPH and METH). One of the new drugs is cathinone (khat), a naturally occurring ?-keto derivative of AMPH~ another is methcathinone (MCAT), an analogous derivative of METH. The infamous and contemporary drug, bath salts, now penetrating our society with cruel effect, is composed of two additional derivatives of the basic ?-keto amphetamine structure, mephedrone (MEPH) and MDPV. To give a forerunner of a recent discovery, we believe that one of the bath salts ingredients (MEPH) is METH-like, i.e., a dopamine releaser via the human dopamine transporter (hDAT), while the other component (MDPV) is cocaine-like, acting as an hDAT blocker. This horrific combination may well account for the devastating effects reported by hospitals for bath salts victims. New drugs will continue t appear on the market, and it is difficult for the Food and Drug Administration to keep up with illegal variants and novel abuses. One of our objectives, therefore, is to codify structural varians of the ?-keto amphetamines (synthetic cathinones) that will predict their effects and speed societal and scientific responses to compounds as they appear on the street, and even before they appear. We approach this research from three complementary directions. First is our collaboration with a medicinal chemist, who will synthesize variations of the lead cathinones, to help understand important moieties and variations behind drug actions, and presently unavailable optical isomers to help uncover underlying mechanisms. Street drugs are invariably racemates, which we also study, but it is of interest to study right- and left-handed versions of synthetic cathinones to see which is more active and study possible positive or negative synergy between the two forms. Second, we will study the direct effect of street drugs and synthesized variants on the dopamine transporter in cell membranes under voltage and chemical control. How do METH and MCAT differ in their ability to stimulate transporters? Which of the synthetic cathinones are stimulants (producing electrical signals indicative of DA release) and which are blockers (producing inhibitory signals)? Because the drugs in question have overlapping effects on the dopaminergic and serotonergic systems, we will also study the biophysical effects of synthetic cathinones on the human serotonin transporter. Finally, we have teamed up with a neuropharmacologist who will measure the release of dopamine and serotonin in regions of the rodent brain associated with drug abuse and in response to specific synthetic cathinones or combination of drugs, as in bath salts. The abuse potential of test drugs will also be measured in self-administration protocols in rodents. We think this combined approach of medicinal chemistry, membrane biophysics, and neurochemistry and behavior has the potential to impact important problems in drug abuse to the benefit of basic science research and society in the 21st century.

Public Health Relevance

Synthetic cathinones, also known colloquially as Bath Salts, have been identified by the Drug Enforcement Agency as an emerging domestic drug abuse threat. This project will investigate molecular mechanisms and abuse-related pharmacology of cathinone and its synthetic derivatives using multidisciplinary tools of medicinal chemistry, membrane biophysics, and whole-animal neurochemistry and behavior. Results will clarify the threat and provide a basis for developing appropriate responses and treatments.

Agency
National Institute of Health (NIH)
Institute
National Institute on Drug Abuse (NIDA)
Type
Research Project (R01)
Project #
5R01DA033930-03
Application #
8636422
Study Section
Special Emphasis Panel (ZRG1-MDCN-B (91))
Program Officer
Rapaka, Rao
Project Start
2012-04-15
Project End
2017-03-31
Budget Start
2014-04-01
Budget End
2015-03-31
Support Year
3
Fiscal Year
2014
Total Cost
$580,458
Indirect Cost
$186,707
Name
Virginia Commonwealth University
Department
Physiology
Type
Schools of Medicine
DUNS #
105300446
City
Richmond
State
VA
Country
United States
Zip Code
23298
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Suyama, J A; Banks, M L; Negus, S S (2018) Effects of repeated treatment with methcathinone, mephedrone, and fenfluramine on intracranial self-stimulation in rats. Psychopharmacology (Berl) :
Johnson, Amy R; Banks, Matthew L; Selley, Dana E et al. (2018) Amphetamine maintenance differentially modulates effects of cocaine, methylenedioxypyrovalerone (MDPV), and methamphetamine on intracranial self-stimulation and nucleus accumbens dopamine in rats. Neuropsychopharmacology 43:1753-1762
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Glennon, Richard A; Dukat, Ma?gorzata (2017) Synthetic Cathinones: A Brief Overview of Overviews with Applications to the Forensic Sciences. Ann Forensic Res Anal 4:
Solis Jr, Ernesto (2017) Electrophysiological Actions of Synthetic Cathinones on Monoamine Transporters. Curr Top Behav Neurosci 32:73-92
Solis Jr, Ernesto; Partilla, John S; Sakloth, Farhana et al. (2017) N-Alkylated Analogs of 4-Methylamphetamine (4-MA) Differentially Affect Monoamine Transporters and Abuse Liability. Neuropsychopharmacology 42:1950-1961
Lazenka, Matthew F; Negus, S Stevens (2017) Oral modafinil facilitates intracranial self-stimulation in rats: comparison with methylphenidate. Behav Pharmacol 28:318-322

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