Abstract
We investigated the effect of human recombinant interleukin-6 (IL-6) on body temperature and acute-phase response, including changes in plasma levels of iron, zinc, copper, and fibrinogen and in circulating leukocyte count. The intravenous (IV) injection of IL-6 (2 μ/kg) produced a monophasic fever. The intracerebroventricular (ICV) injection of IL-6 produced a dose-dependent fever that developed gradually and remained elevated throughout the 5-h recording period. The IV injection of IL-6 decreased the plasma concentration of iron and zinc and increased the circulating leukocyte count. The ICV injection of IL-6 resulted in similar trace metal and leukocyte changes, and increased plasma levels of fibrinogen. These results show that IL-6 can cause fever when injected IV or ICV and induces some acute-phase responses through its action on peripheral target organs and in the central nervous system.
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