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Interleukin-1beta fever in rats: gender difference and estrous cycle influence
A Mouihate1, X Chen, Q J Pittman
1Neuroscience Research Group, Department of Physiology and Biophysics, University of Calgary, Calgary, Alberta, Canada T2N 4N1.
The American Journal of Physiology
|October 29, 1998
Summary
Sex hormones significantly influence fever development in female rats. Ovarian hormones, particularly during proestrus, enhance the fever response to interleukin-1beta, indicating a link between sex hormones and thermogenesis.
Area of Science:
- Immunology
- Neuroendocrinology
- Physiology
Background:
- Pyrogenic cytokines like interleukin-1beta (IL-1beta) can activate the immune system.
- Evidence suggests potential sex differences in immune responses to these cytokines.
Purpose of the Study:
- To investigate the effect of peripheral IL-1beta on fever development in male and female rats.
- To analyze the influence of the estrous cycle and ovarian hormones on IL-1beta-induced fever.
Main Methods:
- Adult male and female rats (cycling or ovariectomized) were administered IL-1beta intraperitoneally.
- Fever response was monitored in females during different estrous cycle stages (proestrus and diestrus).
- Ovariectomized females received hormonal replacement (estradiol 17beta and progesterone) to assess hormone-specific effects.
Main Results:
- Both male and cycling female rats showed similar fever responses to IL-1beta.
- Fever was significantly higher and more prolonged in females during proestrus compared to diestrus.
- Ovariectomized females treated with both estradiol and progesterone exhibited a greater IL-1beta-induced fever than those treated with estradiol alone.
Conclusions:
- Gonadal hormones play a crucial role in modulating fever development in female rats.
- The estrous cycle, through fluctuating ovarian hormone levels, influences thermogenesis in response to pyrogenic cytokines.
- These findings suggest a significant interaction between sex hormones and thermoregulation in females.