For the detection of soluble sIL-6R in sera of mice, the samples were diluted 1:15 in 1% BSA–PBS. The ELISA was performed as described67 (link). In brief, microtiter plates (Greiner Microlon) were coated with anti-murine IL-6-R pAB AF1830 (0.8 μg ml−1; R&D Systems) in PBS. After blocking, 100 μl aliquots of cell lysates or culture supernatants were added. IL-6R bound to the plate was detected by biotinylated goat anti-mouse IL-6-R pAB BAF1830 (working concentration, 0.2 μg ml−1; R&D Systems) followed by streptavidin–horseradish peroxidase (R&D Systems). The enzymatic reaction was performed with soluble peroxidase substrate (BM blue POD from Roche) at 37 °C and the absorbance was read at 450 nm on a SLT Rainbow plate reader (Tecan). For the detection of murine IL-6 in sera of mice, the samples were diluted 1:3 with 1% BSA–PBS.
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