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IL-17A/F (Interleukin-17A/F), ultrasensitive
The IL-17 family is comprised of at least six pro-inflammatory cytokines that share a conserved cysteine-knot structure but diverge at the N-terminus. IL-17 family members are glycoproteins secreted as dimers that induce local cytokine production and recruit granulocytes to sites of inflammation. IL-17 is induced by IL-15 and IL-23, mainly in activated CD4+ T cells distinct from Th1 or Th2 cells. IL-17F is the most homologous to IL-17, but is induced only by IL-23 in activated monocytes. IL-17B binds the IL-17B receptor, but not the IL-17 receptor; it is most homologous with IL-17D, which is expressed by resting CD4+ T cells and CD19+ B cells. IL-17E is mainly produced by Th2 cells and recruits eosinophils to lung tissue. IL-17C has a very restricted expression pattern but has been detected in adult prostate and fetal kidney libraries.
Co-expression of IL-17F and IL-17A in HEK293 cells results in the production of the biologically active IL-17F/IL-17A heterodimer, in addition to the IL-17F and IL-17A homodimers.
The IL-17A immunoassay is a quantitative fluorescent sandwich immunoassay designed to measure IL-17A in human serum or EDTA plasma samples. The detection system employs a single molecule counting (SMC™) technique that enables ultrasensitive biomarker measurement.