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- W2903684005 abstract "The milk protein αS1-casein was recently reported to induce secretion of proinflammatory cytokines via Toll-like receptor 4 (TLR4). In this study, αS1-casein was identified as binder of theTLR4 ecto domain. IL-8 secretion after stimulation of TLR4/MD2 (myeloid differentiation factor 2)/CD14 (cluster of differentiation 14)-transfected HEK293 cells (TLR4+) and Mono Mac 6 cells (MM6) with recombinant αS1-casein, or LPS as control was monitored. Binding of αS1-casein to TLR4 was quantified by microscale thermophoresis (MST). αS1-casein induced secretion of IL-8 in TLR4+ cells and in MM6 cells with a six-times higher final IL-8 concentration in supernatants. IL-8 secretion was inhibited by intracellular TLR4-domain antagonist TAK-242 with an IC50-value of 259.6 nM, by ecto-domain TLR4 antagonistic mianserin with 10–51 μM and by anti-CD14-IgA. The binding constants (KD) of αS1-casein to the TLR4, MD2, and CD14 were 2.8 μM, 0.3 μM and 2.7 μM, respectively. Finally, αS1-casein showed a higher affinity to TLR4/MD2 (KD: 2.2 μM) compared to LPS (KD: 8.2 μM). Human αS1-casein induced proinflammatory effects are dependent upon binding to the TLR4 ectodomain and the presence of CD14. αS1-casein displayed stronger TLR4 agonistic activity than LPS via a different mode of action. Breast milk protein αS1-casein is a proinflammatory cytokine." @default.
- W2903684005 created "2018-12-22" @default.
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- W2903684005 date "2019-03-01" @default.
- W2903684005 modified "2023-10-16" @default.
- W2903684005 title "Human αS1-casein induces IL-8 secretion by binding to the ecto-domain of the TLR4/MD2 receptor complex" @default.
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- W2903684005 doi "https://doi.org/10.1016/j.bbagen.2018.12.007" @default.
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