Binding and functional structure-activity similarities of 4-substituted 2,5-dimethoxyphenyl isopropylamine analogues at 5-HT2A and 5-HT2B serotonin receptors.
Frontiers in pharmacology January 1, 2023 Prithvi Hemanth, Pallavi Nistala, Vy T Nguyen et al. 4 citations
For a series of 13 compounds related to the psychedelic agent 2,5-DMA, rat brain 5-HT2 receptor affinities correlate strongly with human 5-HT2A (r = 0.942) and 5-HT2B (r = 0.916) affinities. Human 5-HT2A affinity also correlates with the lipophilicity of the 4-position substituent (r = 0.798). In functional assays, eight of ten compounds acted as agonists at the human 5-HT2B receptor, while two acted as antagonists. Human 5-HT2B affinity, but not agonist action, correlates with substituent lipophilicity (r = 0.750). Rat and human 5-HT2A affinity may approximate human 5-HT2B affinity but cannot predict agonist action. Some 2,5-DMA analogs on the clandestine market may pose cardiac valvulopathy risk with chronic use via h5-HT2B activation.