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Vol. 12, No. 2, 2005
Issue release date: March 2005

Complement Component C5a Is Integral to the Febrile Response of Mice to Lipopolysaccharide

Li S. · Boackle S.A. · Holers V.M. · Lambris J.D. · Blatteis C.M.
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Objectives: The complement system is critical to the febrile response of mice to intraperitoneally administered lipopolysaccharide (LPS). We previously identified C3 and C5 as two components potentially involved in this response. This study was designed to examine whether the complement system is also pivotal in the response of mice to intravenously or intracerebroventricularly injected LPS, to distinguish between C3 and C5 and their cognate derivatives as the essential mediator(s), and to determine whether the failure of complement-deficient mice to develop a fever could be due to their possible inability to secrete pyrogenic cytokines. Methods: Wild-type (WT; C57BL/6J) mice, hypocomplemented or not by intravenously injected cobra venom factor (10 U/mouse), and C3-, CR3- and C5-sufficient and -deficient mice were intravenously challenged with LPS (0.25 µg/mouse); WT and C3–/– mice pretreated with a C5a receptor antagonist (C5aRa) were similarly challenged. In addition, the serum levels of interleukin (IL)-1β, tumor necrosis factor (TNF)-α and IL-6 were compared in LPS-treated C5+/+ and C5–/– mice. Results: LPS induced a 1°C rise in core temperature in all the mice, except C5–/– mice and those pretreated with C5aRa. C5+/+ and C5–/– mice challenged intracerebroventricularly with LPS exhibited identical febrile responses. LPS induced similar increases in the serum levels of IL-1β, TNFα and IL-6 in C5+/+ and C5–/– mice. Conclusions: C5a is crucial for the development of febrile responses to LPS in mice; its site of action is peripheral, not central. The possibility that an inability to produce cytokines could account for the failure of C5–/– mice to develop a fever is not supported.

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