Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
2088277 | Journal of Immunological Methods | 2013 | 7 Pages |
Autoantibodies to cytokines are important biological effector molecules that can regulate cytokine activities. The aim of the study was to develop a protocol to purify autoantibodies to tumor necrosis factor from human serum, for use as a calibration material to determine the absolute content of autoantibodies to tumor necrosis factor by enzyme-linked immunosorbent assay. The proposed protocol includes a set of affinity chromatography methods, namely, Bio-Gel P6DG sorbent to remove albumin from serum, Protein G Sepharose 4 Fast Flow to obtain a total immunoglobulin G fraction of serum immunoglobulins, and Affi-Gel 15 to obtain specifically antibodies to tumor necrosis factor. The addition of a magnetic separation procedure to the protocol eliminated contaminant tumor necrosis factor from the fraction of autoantibodies to tumor necrosis factor. The protocol generated a pure fraction of autoantibodies to tumor necrosis factor, and enabled us to determine the absolute concentrations of different subclasses of immunoglobulin G autoantibodies to tumor necrosis factor in apparently healthy donors.
► A protocol for affinity purification of IgG autoantibodies to TNF is proposed. ► Magnetic separation is used to remove impurities from TNF. ► The purified fraction of TNF autoantibodies is used for calibration in ELISA. ► We report the absolute contents of different subclasses of IgG autoantibodies to TNF.