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Hypothalamic neuronal histamine modulates physiological responses induced by interleukin-1 beta
M Kang1, H Yoshimatsu, S Chiba
1Department of Internal Medicine I, Oita Medical University, Japan.
The American Journal of Physiology
|December 1, 1995
Summary
Interleukin-1 beta (IL-1 beta) influences eating and body temperature by altering hypothalamic histamine levels. Histamine depletion impacts these IL-1 beta effects, revealing its dynamic role in ingestive behavior and thermogenesis.
Area of Science:
- Neuroscience
- Endocrinology
- Physiology
Background:
- Interleukin-1 beta (IL-1 beta) is a key cytokine involved in immune responses and central nervous system functions.
- Hypothalamic histamine plays a role in regulating physiological processes, including ingestive behavior and thermogenesis.
Purpose of the Study:
- To investigate the dynamic role of hypothalamic histamine in mediating the effects of IL-1 beta on food intake, water intake, and body temperature in rats.
Main Methods:
- Rats were administered IL-1 beta and alpha-fluoromethylhistidine (a histidine decarboxylase inhibitor) intraperitoneally.
- Measurements included food and water intake, rectal temperature, and hypothalamic histamine turnover rate.
- Enzyme activities of histidine decarboxylase (HDC) and histamine-N-methyltransferase (HMT) were assessed.
Main Results:
- IL-1 beta administration decreased food and water intake and increased body temperature.
- Histamine depletion using alpha-fluoromethylhistidine attenuated IL-1 beta's effect on food intake, enhanced its effect on drinking suppression, and amplified its effect on rectal temperature.
- IL-1 beta increased hypothalamic histamine turnover, HDC activity, and HMT activity.
Conclusions:
- Hypothalamic histamine dynamics are modulated by IL-1 beta, involving stimulated synthesis/release via HDC and enhanced degradation via HMT.
- These histamine changes are crucial for mediating IL-1 beta's effects on ingestive behavior and thermogenesis.