Receptor binding profiles and quantitative structure-affinity relationships of some...

Area of Science:

• Pharmacology
• Medicinal Chemistry
• Neuroscience

Background:

• N,N-Diallyltryptamine (DALT) and 5-methoxy-N,N-diallyltryptamine (5-MeO-DALT) are psychoactive tryptamines with poorly characterized pharmacological properties.
• Previous research by Alexander Shulgin indicated differing psychoactivity levels between DALT and 5-MeO-DALT.

Purpose of the Study:

• To synthesize and characterize novel 5-substituted-DALT compounds.
• To evaluate the binding affinities of DALT and its derivatives at various cloned receptors and transporter proteins.
• To identify potential structure-affinity relationships within the 5-substituted-DALT series.

Main Methods:

• Synthesis of novel 5-substituted-N,N-diallyltryptamines.
• In vitro binding assays against 45 cloned receptors and transporter proteins.
• Quantitative structure-activity relationship (QSAR) analysis using electronic, hydrophobic, and steric parameters.

Main Results:

• Identified 27 potential receptor targets for 5-substituted-DALT compounds based on in vitro binding affinities.
• Observed nanomolar affinities for serotonin receptors (5-HT1A, 5-HT1D, 5-HT2B, 5-HT6, 5-HT7), adrenergic receptors (α2A, α2B, α2C), sigma receptors (σ1, σ2), and histamine H1 receptors.
• Established correlations between physicochemical properties (steric volume, electronic, hydrophobic parameters) and binding affinities at specific receptors.

Conclusions:

• Multiple serotonin and non-serotonergic targets are likely involved in the psychoactive effects of DALT drugs.
• Quantitative structure-affinity relationships were identified, aiding in the rational design of more potent and selective DALT analogs.
• The study provides a foundation for further investigation into the therapeutic potential and mechanisms of action of DALT derivatives.