A new compound, LPH-5, acts as a potent partial agonist at the 5-HT2A receptor with high selectivity over related 5-HT2B and 5-HT2C receptors. In rats, LPH-5 induced head-twitch responses and produced both acute and persistent antidepressant-like effects. These findings suggest that selective activation of the 5-HT2A receptor alone can produce antidepressant effects, indicating that this receptor is a key component in the therapeutic action of classical psychedelics like psilocybin and LSD.
A new compound called LPH-5 selectively activates the 5-HT2A receptor, unlike classical psychedelics which also affect related receptors. In rats, LPH-5 produced head-twitch responses (a behavioral marker of 5-HT2A activation) at doses of 0.5-1.0 mg/kg and showed antidepressant-like effects in three different rat models: Flinders Sensitive Line rats, adrenocorticotropic hormone-treated Sprague Dawley rats, and a Wistar Kyoto rat model designed to capture long-term antidepressant effects. The findings suggest that selective 5-HT2A receptor activation is sufficient for antidepressant potential, and that LPH-5 or similar selective compounds could represent a new generation of antidepressant drugs derived from psychedelics.