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Related Experiment Video

Updated: Jun 5, 2026

Isolation of Targeted Hypothalamic Neurons for Studies of Hormonal, Metabolic, and Electrical Regulation

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Published on: August 4, 2023

A hypothalamic circuit for anticipating future changes in energy balance.

Samuel J Walker¹, Elijah D Lowenstein¹, Amelia M Douglass¹

¹Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.

|June 3, 2026

Summary

The brain

Keywords:

AGRP neurons appetite energy balance feeding food intake homeostasis hunger hypothalamus metabolism neuroscience

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Area of Science:

Neuroscience
Metabolism
Behavioral Biology

Background:

AgRP neurons drive hunger and food seeking, typically activated by low energy stores.
Environmental cues can inhibit AgRP neurons, but their role in activation is unclear.

Purpose of the Study:

To investigate if predictions of future fasting can rapidly activate AgRP neurons.
To identify the neural circuits mediating this activation.

Main Methods:

Utilized mouse models to study neural circuit activity.
Investigated the role of paraventricular hypothalamic (PVH) neurons expressing Sim2 (PVH^Sim2).
Examined the effects of chronic silencing of PVH^Sim2 neurons.

Main Results:

Demonstrated rapid activation of AgRP neurons by predicted future fasting in mice.
Identified excitatory input from PVH^Sim2 neurons as the driver of this activation.
Showed that PVH^Sim2 neurons are sensitive to predictions of future energy states.
Chronic silencing of PVH^Sim2 neurons led to persistent hypophagia (reduced appetite).

Conclusions:

Cognitively processed contextual information via PVH^Sim2 neurons strongly activates AgRP neurons.
The PVH^Sim2-to-AgRP-neuron circuit anticipates and prevents negative energy balance.
This circuit offers a novel dimension to hunger regulation by predicting future energy states.