Antidiabetic Effects of Interleukin 1
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Interleukin 1 (IL-1), a cytokine released mainly by activated macrophages-monocytes, affects glucose homeostasis and may mediate some of the metabolic derangements observed during certain inflammatory and infectious processes. In this report, it is shown that IL-1 acts as a hypoglycemic agent not only in normal animals but also in mice at early stages of alloxan-induced diabetes and in genetically diabetic, insulin-resistant C57BL/Ks db/db mice and C57BL/6J ob/ob mice. In these animal models, a single injection of a low dose of human recombinant IL-1 normalized glucose blood levels for several hours. This effect was not mediated by possible insulin secretagogue actions of the cytokine. Furthermore, IL-1 markedly reduced the levels of triglycerides in blood of streptozotocin-induced diabetic mice at later stages of the disease. Although the final mechanism of action is at present unknown, the results showed that IL-1 is a hormone with powerful antidiabetic properties. Defective production of this cytokine associated with diabetes could contribute to aggravate the course of the disease during infectious and inflammatory processes.
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