Increased reactivity of the paraventricular nucleus of the hypothalamus and decreased threat responding in male rats following psilocin administration

Devin P. Effinger, Jessica L. Hoffman, Sarah E. Mott, Sarah N. Magee, Sema G. Quadir, Christian S. Rollison, Daniel Toedt, Maria Echeveste Sanchez, Margaret W. High, Clyde W. Hodge and Melissa A. Herman ()
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Devin P. Effinger: University of North Carolina at Chapel Hill
Jessica L. Hoffman: University of North Carolina at Chapel Hill
Sarah E. Mott: University of North Carolina at Chapel Hill
Sarah N. Magee: University of North Carolina at Chapel Hill
Sema G. Quadir: University of North Carolina at Chapel Hill
Christian S. Rollison: University of North Carolina at Chapel Hill
Daniel Toedt: University of North Carolina at Chapel Hill
Maria Echeveste Sanchez: University of North Carolina at Chapel Hill
Margaret W. High: University of North Carolina at Chapel Hill
Clyde W. Hodge: University of North Carolina at Chapel Hill
Melissa A. Herman: University of North Carolina at Chapel Hill

Nature Communications, 2024, vol. 15, issue 1, 1-15

Abstract: Abstract Psychedelics have experienced renewed interest following positive clinical effects, however the neurobiological mechanisms underlying effects remain unclear. The paraventricular nucleus of the hypothalamus (PVN) plays an integral role in stress response, autonomic function, social behavior, and other affective processes. We investigated the effect of psilocin, the psychoactive metabolite of psilocybin, on PVN reactivity in Sprague Dawley rats. Psilocin increased stimulus-independent PVN activity as measured by c-Fos expression in male and female rats. Psilocin increased PVN reactivity to an aversive air-puff stimulus in males but not females. Reactivity was restored at 2- and 7-days post-injection with no group differences. Additionally, prior psilocin injection did not affect PVN reactivity following acute restraint stress. Experimental groups sub-classified by baseline threat responding indicate that increased male PVN reactivity is driven by active threat responders. These findings identify the PVN as a significant site of psychedelic drug action with implications for threat responding behavior.

Date: 2024
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DOI: 10.1038/s41467-024-49741-9

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