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Snapshot IP₁ Detection Following 5-HT₂A Receptor Stimulation in the Mouse Brain.

Mario de la Fuente Revenga^1,2,3, Javier González-Maeso^1,2

¹Department of Physiology & Biophysics, Virginia Commonwealth University School of Medicine, Richmond, Virginia 23298, United States.

ACS Chemical Neuroscience

|January 2, 2026

Summary

This summary is machine-generated.

Psychedelic drugs like LSD activate the serotonin 2A receptor (5-HT_2AR), but the molecular differences between psychedelic and non-psychedelic agonists are unclear. This study developed a new method to measure 5-HT_2AR activation in mouse brains, revealing drug-specific signaling patterns.

Keywords:

G coupled-receptors (GPCRs)LSD head-twitch response (HTR)homogeneous time-resolved fluorescence inositol phosphate (IP)psychedelics serotonin 2A receptor (5-HT2AR)

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Area of Science:

Neuroscience
Pharmacology
Biochemistry

Background:

The subjective effects of psychedelics (e.g., LSD, psilocybin) are linked to serotonin 2A receptor (5-HT_2AR) activation.
Understanding the molecular mechanisms differentiating psychedelic from non-psychedelic 5-HT_2AR agonists is crucial but remains incomplete.

Purpose of the Study:

To develop and validate a novel ex vivo platform for assessing drug-mediated 5-HT_2AR signaling via the G_q/11 pathway.
To investigate the pharmacokinetic and pharmacodynamic properties of various psychoactive compounds at the 5-HT_2AR in native brain tissue.

Main Methods:

Developed a nonradioactive methodology to measure inositol monophosphate (IP₁) levels in mouse brain homogenates.
Assessed method specificity using 5-HT_2AR knockout mice and comparing different brain regions (frontal cortex, striatum, cerebellum).
Quantified IP₁ changes in response to LSD, lisuride, and MDMA, correlating with behavioral responses (head twitch).

Main Results:

The method successfully captured dose- and time-dependent IP₁ changes in response to DOI, correlating with head twitch responses.
Observed differential IP₁ levels for LSD (psychedelic) and lisuride (non-psychedelic), aligning with their known 5-HT_2AR activity.
MDMA induced an IP₁ signal distinct from serotonin precursors or reuptake inhibitors, attributed to indirect 5-HT_2AR stimulation via serotonin release.

Conclusions:

The developed ex vivo platform provides mechanistic insights into psychedelic drug action and G_q/11-coupled receptor pharmacology.
This methodology allows for the characterization of drug-specific 5-HT_2AR signaling profiles in native brain tissue.
The findings highlight the utility of IP₁ turnover as a readout for differentiating direct and indirect receptor activation by psychoactive compounds.