Related Experiment Videos
Patterns of histamine release in the brain
1Department of Pharmacodynamics and Toxicology, University of Innsbruck, Austria.
Agents and Actions
|May 1, 1991
Summary
Histamine is released in brain areas of cats and rats in ultradian rhythms, approximately every 1-2 hours. This brain histamine release also shows faster oscillations and increases during nighttime hours.
Area of Science:
- Neuroscience
- Neurochemistry
- Chronobiology
Background:
- Histamine plays a crucial role in regulating various physiological processes within the brain.
- Understanding the temporal dynamics of histamine release is essential for deciphering its complex functions.
Purpose of the Study:
- To investigate the temporal patterns of histamine release in specific brain regions of anesthetized cats and conscious rats.
- To identify ultradian rhythms and faster oscillations in histamine release.
Main Methods:
- Utilized the push-pull perfusion technique to measure histamine release in vivo.
- Studied brain areas including the hypothalamus, medial amygdaloid nucleus, and mamillary body.
- Recorded release patterns in both anesthetized cats and freely moving conscious rats.
Main Results:
- Identified ultradian rhythms of histamine release (1 cycle per 1-2 hours) in the hypothalamus, medial amygdaloid nucleus, and mamillary body of cats.
- Observed faster oscillations (1 oscillation per 10 minutes) in the medial amygdaloid nucleus and mamillary body.
- Found rhythmic histamine release (1 cycle per 1.5 hours) in the posterior hypothalamus of conscious rats, with increased release during nighttime.
Conclusions:
- Histamine release in the brain exhibits distinct ultradian and faster oscillatory patterns.
- These rhythmic patterns vary between species and brain regions.
- Nocturnal increases in histamine release suggest a role in regulating circadian or sleep-wake processes.