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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Pharmacol. | doi: 10.3389/fphar.2019.01284

STRUCTURE-EFFECT RELATIONSHIPS OF NOVEL SEMI-SYNTHETIC CANNABINOID DERIVATIVES

 Marcus R. Götz1, 2*,  Juan A. Collado3, 4,  Javier Fernández-Ruiz5,  Bernd L. Fiebich6,  Laura Garcia-Toscano5, Maria Gomez-Canas5, Oskar Koch1,  Andreas Leha7,  Eduardo Muñoz8, Carmen Navarete3,  Ruth Pazos9 and Ulrike Holzgrabe10
  • 1Symrise AG, Germany
  • 2Institute of Pharmacy and Food Chemistry, Julius Maximilian University of Würzburg, Germany
  • 3Vivacell Biotechnology España SL, Spain
  • 4Departamento de Biologia Celular, Fisiologia e Immunologia, Hospital Uiversitario Reina Sofia, Universidad de Córdoba, Spain
  • 5Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Investigación en Neuroquímica, Universidad Complutense de Madrid, Spain
  • 6VivaCell Biotechnology GmbH, Germany
  • 7Institute of Medical Statistics, University of Göttingen, Germany
  • 8Department of Cell Biology, Physiology and Immunology, University of Córdoba, Spain
  • 9Instituto Universitario de Investigación en Neuroquímica, Universidad Complutense de Madrid, Spain
  • 10Institute of Pharmacy and Food Chemistry, Julius-Maximilians-University of Würzburg, Germany

Background: As a library of cannabinoid derivatives with (-)-trans-cannabidiol (CBD) or (−)-trans-cannabidivarin (CBDV) scaffold, we synthesized nine novel cannabinoids: 2-HEC, 2-HPC, GCBD, CHC, HC, NMSC, 2-HECBDV, CHCBDV, HCBDV. Their binding and intrinsic effects at the cannabinoid (CB)1- and CB2-receptor and the effects on inflammatory signaling cascades were investigated in in vitro and ex vivo cell models.
Materials and methods: Binding affinity was studied in membranes isolated from CB-receptor-transfected HEK293EBNA cells, intrinsic functional activity in CHO cells, and activation of nuclear factor κB (NF-κB) and nuclear factor of activated T-cells (NFAT) in phorbol 12-myristate 13-acetate (PMA)/ionomycin (IO)-treated Jurkat T-cells. Inhibition of interleukin (IL)-17 induced pro-inflammatory cytokines and chemokines (IL-6, IL-1β, CC-chemokine ligand 2 (CCL2), tumor necrosis factor (TNF)-α) was studied in RAW264.7 macrophages at the RNA level. Pro-inflammatory cytokines (IL-1β, IL-6, IL-8, TNF-α) and prostaglandin E2 (PGE2) expression was investigated at the protein level in lipopolysaccharide (LPS)-treated primary human monocytes.
Results: Derivatives with long aliphatic side chains at the ester position at R1 (HC [5]) as well as the ones with polar side chains (2-HECBDV [7], NMSC [6], 2-HEC [1]) can be selective for CB2-receptors. The CBDV-derivatives HCBDV and CHCBDV demonstrated specific binding at CB1- and CB2-receptors at nanomolar concentrations. 2-HEC, 2-HPC, GCBD, and NMSC were agonists at CB2- and antagonists at CB1-receptors. 2-HECBDV was an agonist at CB2-receptor and an antagonist at the CB1-receptor. NMSC inhibited NF-κB and NFAT activity, and 2-HEC, 2-HPC, and GCBD dose-dependently inhibited PMA/IO-stimulated NFAT activation. CHC and HC dose-dependently reduced IL-1β and CCL2 mRNA expression. NMSC inhibited IL-1β, CCL2, and TNF-α at lower doses. At higher doses, it induced a pronounced increase in IL-6 mRNA. 2-HEC, 2-HPC, and GCBD dose-dependently inhibited LPS-induced IL-1β, TNF-α, and IL-6 synthesis. NMSC further increased LPS-stimulated IL-1β release, but inhibited IL-8, TNF-α, and PGE2.
Conclusion: The CBD- and CBDV-derivatives studied are suitable for targeting CB-receptors. Some may be used as selective CB2 agonists. The length of the aliphatic rest at R2 of CBD (pentyl) and CBDV (propyl) did not correlate with the binding affinity. Higher polarity at R1 appeared to favor the agonistic activity at CB2-receptors.

Keywords: Cannabidiol, cannabidivarin, CBD - cannabidiol, CBDV, CB-receptor, agonist, binding, anti-inflammatory

Received: 05 Jun 2019; Accepted: 07 Oct 2019.

Copyright: © 2019 Götz, Collado, Fernández-Ruiz, Fiebich, Garcia-Toscano, Gomez-Canas, Koch, Leha, Muñoz, Navarete, Pazos and Holzgrabe. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Marcus R. Götz, Symrise AG, Holzminden, Germany, rudi.goetz@googlemail.com