D-morphinan analogs with favorable pharmacokinetic profiles as dual-acting antidepressants

Eur J Med Chem. 2025 Apr 5:287:117349. doi: 10.1016/j.ejmech.2025.117349. Epub 2025 Feb 6.

Abstract

Dextromethorphan (DM) is a dual inhibitor of NMDAR and SERT (IC50 (NMDAR): IC50 (SERT) = 31), but lacks therapeutic clinical value for the treatment of depression due to its low exposure in the human body. In this study, a series of d-morphinan derivatives were designed, synthesized and evaluated both in vitro and in vivo to identify dual inhibitors with improved metabolic stability. Structure-activity relationship studies revealed that a methyl group at the morphinan N-17 position is essential for maintaining SERT activity. Amino-morphinan compounds 24 and 27 exhibited moderate yet more balanced inhibitory activity against both NMDAR and SERT (1< IC50(NMDAR): IC50(SERT) < 5). Compared to DM, compound 24 demonstrated favorable metabolic stability and higher plasma exposure. In vivo, 24 showed significant antidepressant-like effects in the forced swim test in mice after acute administration.

MeSH terms

  • Animals
  • Antidepressive Agents* / chemical synthesis
  • Antidepressive Agents* / chemistry
  • Antidepressive Agents* / pharmacokinetics
  • Antidepressive Agents* / pharmacology
  • Depression / drug therapy
  • Dose-Response Relationship, Drug
  • Humans
  • Male
  • Mice
  • Molecular Structure
  • Receptors, N-Methyl-D-Aspartate / antagonists & inhibitors
  • Receptors, N-Methyl-D-Aspartate / metabolism
  • Serotonin Plasma Membrane Transport Proteins / metabolism
  • Structure-Activity Relationship

Substances

  • Antidepressive Agents
  • Receptors, N-Methyl-D-Aspartate
  • Serotonin Plasma Membrane Transport Proteins