Related Experiment Videos
Functional and structural differences in febrile mechanism between rabbits and rats
A Morimoto1, N Murakami, Y Sakata
1Department of Physiology, Yamaguchi University School of Medicine, Japan.
The Journal of Physiology
|August 1, 1990
Summary
Rabbits show a greater fever response to intravenous interleukin-1 (IL-1) than rats, but central nervous system sensitivity is similar. Structural differences in the organum vasculosum laminae terminalis (OVLT) may explain these varying febrile responses.
Area of Science:
- Immunology
- Neuroscience
- Physiology
Background:
- Interleukin-1 (IL-1) is a key mediator of fever.
- The role of the organum vasculosum laminae terminalis (OVLT) in fever induction is under investigation.
- Species-specific differences in febrile responses to pyrogens are not fully understood.
Purpose of the Study:
- To compare the febrile responsiveness of rabbits and rats to intravenous and intracerebroventricular administration of IL-1 alpha, IL-1 beta, and prostaglandin E2.
- To investigate potential structural differences in the OVLT that may underlie observed species-specific fever responses.
Main Methods:
- Rabbits and rats received intravenous (I.V.) or intracerebroventricular (ICV) injections of human recombinant IL-1 alpha, IL-1 beta, or prostaglandin E2.
- Body temperature was monitored to assess febrile responses.
- Histological examination of the OVLT was performed in both species.
Main Results:
- I.V. IL-1 alpha and IL-1 beta induced dose-dependent fevers in both species, with rabbits exhibiting significantly greater responses than rats.
- ICV IL-1 alpha and IL-1 beta also induced dose-dependent fevers, with similar patterns in both species, though rabbits showed higher sensitivity to IL-1 alpha.
- Rats exhibited greater febrile responses to prostaglandin E2 via ICV injection compared to rabbits, and rabbits possess a distinct OVLT vascular structure compared to rats.
Conclusions:
- Rabbits demonstrate higher peripheral sensitivity to IL-1-induced fever compared to rats.
- Central nervous system fever sensitivity to IL-1 is comparable between rabbits and rats.
- Structural variations in the OVLT, specifically its vascular components, likely contribute to the observed species-specific differences in febrile responses to IL-1.