Abstract
Regulatory T cells (Tregs) suppress immune responses via a variety of mechanisms and can be used as a cellular therapy to induce tolerance. The function of Tregs is commonly assessed in vitro using assays that measure suppression of effector T cell proliferation and/or cytokine production. However, Tregs can also suppress the function of antigen presenting cells, creating a need for methodology to routinely measure this aspect of their function. This protocol describes a method to measure human Treg-mediated suppression of CD80 and CD86 expression on mature, monocyte-derived dendritic cells. Representative data show suppression mediated by polyclonal Tregs as well as antigen-specific Tregs generated using chimeric antigen receptor (CAR) technology. This method can be used in parallel to T cell suppression assays to measure the functional activity of human Tregs.
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