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Pattern differences in experimental fevers induced by endotoxin, endogenous pyrogen, and prostaglandins.
A Morimoto1, T Nakamori, T Watanabe
1Department of Physiology, Yamaguchi University School of Medicine, Japan.
The American Journal of Physiology
|April 1, 1988
Summary
Different pyrogen administration routes create distinct fever patterns. Intravenous endotoxin, endogenous pyrogen, or interleukin-1 can cause biphasic fever, while other routes show varied onset and duration, suggesting complex fever mechanisms.
Area of Science:
- Neuroscience
- Immunology
- Physiology
Background:
- Fever is a complex physiological response.
- Understanding fever pathogenesis is crucial for therapeutic development.
Purpose of the Study:
- To differentiate fever patterns induced by various pyrogens.
- To investigate the impact of administration routes on fever responses.
Main Methods:
- Administered pyrogens including lipopolysaccharide (LPS), endogenous pyrogen (EP), interleukin-1 (IL-1), and prostaglandins (PGE2, PGF2α) via intravenous (IV), intracerebroventricular (ICV), and intra-preoptic/anterior hypothalamic (POA) routes.
- Monitored fever onset latency, peak time, and duration.
Main Results:
- High concentrations of IV LPS, EP, or IL-1 induced biphasic fever; low concentrations caused monophasic fever.
- IV LPS or EP showed similar fever onset and peak times as ICV/POA PGE2.
- ICV/POA administration of LPS, EP, IL-1, or PGF2α resulted in longer fever onset latency and duration.
Conclusions:
- Distinct fever patterns emerge based on pyrogen type and administration route.
- Findings suggest multiple mediators or multiprocesses in fever pathogenesis.