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Defective inflammatory response in interleukin 6-deficient mice
E Fattori1, M Cappelletti, P Costa
1Istituto di Ricerche di Biologia Molecolare IRBM P. Angeletti, Pomezia, Roma.
The Journal of Experimental Medicine
|October 1, 1994
Summary
Interleukin 6 (IL-6) is crucial for localized inflammation responses but not systemic ones. IL-6-deficient mice show reduced acute phase protein induction and weight loss in localized inflammation, but normal responses to bacterial lipopolysaccharide (LPS).
Area of Science:
- Immunology
- Molecular Biology
Background:
- Inflammation involves host responses like fever and changes in liver proteins.
- Interleukin 6 (IL-6) is a key mediator of inflammatory responses, alongside IL-1 and TNF-alpha.
Purpose of the Study:
- To determine the precise role of IL-6 in inflammatory phenomena using IL-6-deficient mice.
- To differentiate IL-6's function in localized versus systemic inflammation.
Main Methods:
- Gene targeting to generate IL-6-deficient mice.
- Induction of localized inflammation via turpentine injection.
- Induction of systemic inflammation via bacterial lipopolysaccharide (LPS) injection.
Main Results:
- IL-6-deficient mice exhibit impaired inflammatory responses to localized tissue damage, with reduced acute phase protein induction, weight loss, anorexia, and hypoglycemia.
- Systemic inflammation induced by LPS affects IL-6-deficient and wild-type mice similarly, indicating IL-6 is dispensable in this context.
- LPS-treated IL-6-deficient mice show increased TNF-alpha production, suggesting a compensatory mechanism.
- Hypothalamic-pituitary-adrenal axis activation, indicated by corticosterone induction, is normal in IL-6-deficient mice.
Conclusions:
- IL-6 is an essential mediator of the inflammatory response to localized tissue damage.
- Different cytokine patterns are involved in systemic versus localized inflammation.
- IL-6 is not required for the activation of the hypothalamic-pituitary-adrenal axis during inflammation.