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Activated monocytes/macrophages and T lymphocytes that produce a cytokine storm are assumed to play a pivotal role in the pathogenesis of dengue. Interleukin-18 (IL-18) is a proinflammatory cytokine that is increased during dengue and known to induce gamma interferon (IFN-γ), which is crucial for dengue immune response. No data are available regarding the balance between IL-18 and its natural inhibitor IL-18 binding protein (IL-18BP) and how they interact within the inflammatory reaction of patients with dengue virus infections. Circulating levels of IL-18; IL-18BP; free, biologically active IL-18; the IL-18-dependent proinflammatory cytokine IFN-γ; monocyte-derived cytokines; and ferritin were assessed in adult Indonesian dengue patients (n = 95). Healthy individuals (n = 22) and leptospirosis (n = 19) and enteric fever (n = 6) patients served as controls. Total IL-18 levels were increased during dengue, leptospirosis, and enteric fever compared to healthy controls. However, due to a concurrent increase in IL-18BP levels, biologically active IL-18 levels remained similar in the different phases of dengue and in patients with leptospirosis. Biologically active IL-18 levels were also similar in patients with severe and nonsevere dengue. In conclusion, high total IL-18 and IL-18BP levels concur in dengue virus infections, leptospirosis, and enteric fever. This resulted in unchanged levels of free, biologically active IL-18 in dengue and leptospirosis, which underlines the importance of measuring both IL-18 and IL-18BP when studying the role of IL-18 in diseases.

Normal Free Interleukin-18 (IL-18) Plasma Levels in Dengue Virus Infection and the Need To Measure Both Total IL-18 and IL-18 Binding Protein Levels