2. Academic Validation
  3. Pharmacological characterizations of the 'legal high' fluorolintane and isomers

Pharmacological characterizations of the 'legal high' fluorolintane and isomers

  • Eur J Pharmacol. 2019 Aug 15;857:172427. doi: 10.1016/j.ejphar.2019.172427.
Jason Wallach 1,  Tristan Colestock 2,  Julià Agramunt 3,  Matt D B Claydon 3,  Michael Dybek 4,  Nadine Filemban 2,  Muhammad Chatha 5,  Adam L Halberstadt 6,  Simon D Brandt 7,  David Lodge 3,  Zuner A Bortolotto 3,  Adeboye Adejare 8
Affiliations

Affiliations

  • 1 Department of Pharmaceutical Sciences, University of the Sciences, Philadelphia, PA, USA; Substance Use Disorders Institute, University of the Sciences, Philadelphia, PA, USA. Electronic address: [email protected].
  • 2 Department of Pharmaceutical Sciences, University of the Sciences, Philadelphia, PA, USA.
  • 3 Centre for Synaptic Plasticity, School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, United Kingdom.
  • 4 Department of Chemistry and Biochemistry, University of the Sciences, Philadelphia, PA, USA.
  • 5 Department of Psychiatry, University of California San Diego, La Jolla, CA, USA.
  • 6 Department of Psychiatry, University of California San Diego, La Jolla, CA, USA; Research Service, VA San Diego Healthcare System, San Diego, CA, USA.
  • 7 School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Byrom Street, Liverpool, L3 3AF, United Kingdom.
  • 8 Department of Pharmaceutical Sciences, University of the Sciences, Philadelphia, PA, USA; Department of Chemistry and Biochemistry, University of the Sciences, Philadelphia, PA, USA.
PMID: 31152702 DOI: 10.1016/j.ejphar.2019.172427
Abstract

1,2-Diarylethylamines represent a class of molecules that have shown potential in the treatment of pain, epilepsy, neurodegenerative disease and depression. Examples include lefetamine, remacemide, and lanicemine. Recently, several 1,2-diarylethylamines including the dissociatives diphenidine, methoxphenidine and ephenidine as well as the opioid MT-45, have appeared as 'research chemicals' or 'legal highs'. Due to their recent emergence little is known about their pharmacology. One of these, 1-[1-(2-fluorophenyl)-2-phenylethyl]pyrrolidine (fluorolintane, 2-F-DPPy), is available for purchase with purported dissociative effects intended to resemble phencyclidine (PCP) and ketamine. To better understand this emerging class, pharmacological investigations were undertaken for the first time on fluorolintane and its five aryl-fluorine-substituted isomers. In vitro binding studies revealed high affinity for N-methyl-D-aspartate (NMDA) receptors with fluorolintane (Ki = 87.92 nM) with lesser affinities for related compounds. Additional affinities were seen for all compounds at several sites including norepinephrine (NET), serotonin (SERT) and dopamine (DAT) transporters, and sigma receptors. Notably high affinities at DAT were observed, which were in most cases greater than NMDA receptor affinities. Additional functional and behavioral experiments show fluorolintane inhibited NMDA receptor-induced field excitatory postsynaptic potentials in rat hippocampal slices and inhibited long-term potentiation induced by theta-burst stimulation in rat hippocampal slices with potencies consistent with its NMDA receptor antagonism. Finally fluorolintane inhibited prepulse inhibition in rats, a measure of sensorimotor gating, with a median effective dose (ED50) of 13.3 mg/kg. These findings are consistent with anecdotal reports of dissociative effects of fluorolintane in humans.

Keywords

Diphenidine; Fluorolintane; Ketamine; Legal high; NMDA receptor antagonist.

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