Abstract
The overproduction of cytokines such as the tumor necrosis factor-α (TNF-α) and interleukin-1α (IL-1α) may cause further deterioration in the already critical condition of patients with shock, sepsis, and acute inflammation. The effectiveness of infusion therapy of natural human IgG to such patients is suggested to depend partly upon the inhibition of the productivity of these cytokines. In this study, we investigated the modulation effects of IgG and its fragments on the production of TNF-α and IL-1α, on human peripheral blood mononuclear cells (PBMC). The production of TNF-α and IL-1α was found to be dose-dependently inhibited by IgG when stimulated by lipopolysaccharide (LPS), phytohemagglutinin (PHA), concanavalin A (Con A), and interleukin-2 (IL-2). However, no inhibition was seen when stimulated by phorbormyristate acetate (PMA). The F(ab′)2 fragment showed enhancing effects on cytokine production by LPS, while the Fc fragment showed not as much inhibitory effect as whole intact IgG. IgG showed no direct cytotoxic effect on PBMC. These data suggest that natural human IgG inhibits TNF-α and IL-1α production by PBMC through the Fc portion. The results of this study led us to conclude that whole intact IgG may be the best form of therapeutic delivery.
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Horiuchi, A., Abe, Y., Miyake, M. et al. Natural human IgG inhibits the production of tumor necrosis factor-α and interleukin-1α through the Fc portion. Surg Today 23, 241–245 (1993). https://doi.org/10.1007/BF00309234
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DOI: https://doi.org/10.1007/BF00309234