Abstract
Interferon regulatory factor 5 (IRF5) is a key transcription factor for regulating the immune response. It is activated downstream of the Toll-like receptor myeloid differentiation primary response gene 88 (TLR-MyD88) signaling pathway. IRF5 activation involves phosphorylation, dimerization, and subsequent translocation from the cytoplasm into the nucleus, which in turn induces the gene expression of various pro-inflammatory cytokines. A detection assay for IRF5 activation is essential to studying IRF5 functions and its relevant pathways. This article describes a robust assay to detect endogenous IRF5 activation in the CAL-1 human plasmacytoid dendritic cell (pDC) line. The protocol consists of a modified nondenaturing electrophoresis assay that can distinguish IRF5 in its monomer and dimer forms, thus providing an affordable and sensitive approach to analyze IRF5 activation.
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