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Hormonal Regulation

Hormonal Regulation

Hormones regulate a significant portion of digestion through activation of the neuroendocrine system. The neuroendocrine system of digestion contains many different hormones all with multiple functions that are both, directly and indirectly, involved in digestion.

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Histamine Dynamics During Ingestive Behavior Measured by the Novel Biosensor HisLightG.

K L Volcko¹, A Gresch², B Benowitz³

¹Department of Psychology, UiT The Arctic University of Norway, Tromsø, Norway.

Journal of Neurochemistry

|July 4, 2025

Summary

Histamine neurotransmitter levels rapidly change during feeding. Enhancing histamine tone reduces food intake, suggesting its role in appetite suppression.

Keywords:

appetite biosensors feeding photometry

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Area of Science:

Neuroscience
Neuroendocrinology
Physiology

Background:

The neurotransmitter histamine influences food intake regulation.
Histamine's dynamic changes during feeding episodes are not well understood.

Purpose of the Study:

To measure real-time histamine release in the hypothalamus during feeding.
To investigate how hunger, time of day, and caloric content affect histamine fluctuations.
To explore histamine's role in appetite suppression.

Main Methods:

Utilized a novel genetically-encoded histamine sensor (HisLightG) and fiber photometry.
Measured histamine release in the paraventricular nucleus (PVH) and ventromedial hypothalamus (VMH) of mice.
Administered L-histidine to enhance histamine tone and observed effects on licking behavior.

Main Results:

Histamine levels exhibited rapid changes in response to eating.
Histamine responses varied with experimental conditions (e.g., sucralose, light cycle).
Distinct regional differences in histamine dynamics were observed between the PVH and VMH.
Increased histamine tone reduced licking behavior across various sucrose concentrations.

Conclusions:

Histaminergic activity is rapidly modulated during ingestive episodes.
Understanding histamine release patterns provides insight into appetite suppression mechanisms.
Histamine plays a significant role in regulating food intake.