An amygdala to anterior hypothalamic circuit gates stress sensitivity.

A circuit from the amygdala to the anterior hypothalamic nucleus (AHN) heightens stress sensitivity, with increased negative valence processing in previously stressed mice.

• Why it matters: Understanding how prior adversity alters brain circuits to increase stress reactivity is crucial for developing interventions for stress-related disorders.
• What they did: The researchers used whole-brain activity mapping, in vivo Miniscope imaging, and circuit manipulations to study stress responses in mice, focusing on the amygdala-AHN pathway.
• The result: Inhibiting AHN neurons reduced stress responses, while activating them increased sensitivity; silencing amygdala inputs to the AHN abolished heightened stress reactivity, revealing a key pathway in stress vulnerability.