Indolethylamine N-Methyltransferase Deletion Impacts Mouse Behavior without Disrupting Endogenous Psychedelic...

Area of Science:

• Neuroscience
• Biochemistry
• Pharmacology

Background:

• Exogenous psychedelics impact neuroplasticity and behavior.
• The role of endogenous psychedelics in health and disease is understudied due to challenges in quantification and production manipulation.

Purpose of the Study:

• To develop sensitive analytical methods for quantifying endogenous psychedelics in mice.
• To investigate the role of indolethylamine N-methyltransferase (INMT) in endogenous psychedelic production using a genetic knockout model.

Main Methods:

• Development of sensitive mass spectrometry-based assays for endogenous psychedelic quantification.
• Generation and behavioral analysis of a genetic mouse model lacking INMT (INMT knockout).

Main Results:

• INMT knockout mice exhibited no major abnormalities in reproduction or growth.
• Significant alterations in a range of mouse behaviors were observed in INMT knockout mice.
• INMT knockout did not lead to a discernible decrease in endogenous psychedelic levels.

Conclusions:

• The enzyme INMT is not essential for endogenous psychedelic production in mice.
• Rodents may utilize alternative biosynthetic pathways for producing endogenous psychedelics.
• Further research is needed to elucidate the complete pathways of endogenous psychedelic synthesis.