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The response to danger: Is it in your bones?

Isabella Canal Delgado¹, Gerard Karsenty²

¹Institute of Human Nutrition, Columbia University Irving Medical Center, New York, NY 10032, USA; Department of Genetics and Development, Columbia University Irving Medical Center, New York, NY 10032, USA.

|May 7, 2026

Summary

The bone hormone osteocalcin keeps specific brain neurons ready for action. This bone-to-brain circuit is crucial for quickly spotting and escaping visual threats.

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Area of Science:

Neuroendocrinology
Neuroscience

Background:

Osteocalcin is a bone-derived hormone with known systemic effects.
The ventral tegmental area (VTA) is a key brain region involved in reward and motivation.
GPR37-expressing neurons in the VTA are implicated in various neurological processes.

Purpose of the Study:

To investigate the role of circulating osteocalcin in VTA GABAergic neuron function.
To elucidate the bone-to-brain neuroendocrine circuit's involvement in threat detection.
To determine the necessity of this circuit for escape responses to visual threats.

Main Methods:

Utilized rodent models to study the effects of osteocalcin.
Employed genetic and pharmacological tools to manipulate GPR37+ VTA GABAergic neurons.
Assessed behavioral responses to visual threat stimuli.

Main Results:

Demonstrated that osteocalcin maintains GPR37+ VTA GABAergic neurons in a state of readiness.
Established that this bone-to-brain circuit is essential for rapid visual threat detection.
Confirmed the circuit's necessity for initiating an effective escape response.

Conclusions:

The bone-to-brain neuroendocrine circuit involving osteocalcin and VTA GABAergic neurons is critical for survival behaviors.
Osteocalcin signaling directly impacts neuronal excitability in the VTA, influencing threat perception.
This study reveals a novel mechanism by which bone influences brain function and behavior.