Abstract
Fever, a hallmark of disease, is elicited by exogenous pyrogens, that is, cellular components, such as lipopolysaccharide (LPS), of infectious organisms, as well as by non-infectious inflammatory insults. Both stimulate the production of cytokines, such as interleukin (IL)-1β, that act on the brain as endogenous pyrogens1. Fever can be suppressed by aspirin-like anti-inflammatory drugs. As these drugs share the ability to inhibit prostaglandin biosynthesis2, it is thought that a prostaglandin is important in fever generation. Prostaglandin E2 (PGE2) may be a neural mediator of fever3, but this has been much debated1,4,5,6,7. PGE2 acts by interacting with four subtypes of PGE receptor, the EP1, EP2, EP3 and EP4 receptors8. Here we generate mice lacking each of these receptors by homologous recombination. Only mice lacking the EP3 receptor fail to show a febrile response to PGE2 and to either IL-1β or LPS. Our results establish that PGE2 mediates fever generation in response to both exogenous and endogenous pyrogens by acting at the EP3 receptor.
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Acknowledgements
We thank Y. Kataoka and K. Ishikawa for injection of embryonic stem cells, K.Takahashi for animal breeding, and K. Okuyama and T. Arai for secretarial assistance. This work was supported by grants-in-aid from the Ministry of Education, Science, Sports and Culture of Japan and from the Ministry of Health and Welfare of Japan, and by grants from the Uehara Memorial Foundation, the Smoking Research Foundation and the Japanese Foundation on Metabolism and Diseases.
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Ushikubi, F., Segi, E., Sugimoto, Y. et al. Impaired febrile response in mice lacking the prostaglandin E receptor subtype EP3. Nature 395, 281–284 (1998). https://doi.org/10.1038/26233
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DOI: https://doi.org/10.1038/26233