IL-15 expression in CD14⁺ cells of ACs and HAM/TSP patients. (A) Time course of surface IL-15 expression in CD14⁺ cells from 3 ACs (□) and 3 HAM/TSP patients (■). (B) Representative histograms of surface IL-15 expression on CD14⁺ cells from ACs and a HAM/TSP patient before and after the culture for 5 hours. Staining with anti–Il-15 (opened histograms) and IgG isotype control (grayed histograms) in CD14⁺ cells were shown. (C) Time course of intracellular IL-15 expression in CD14⁺ cells from 3 ACs (□) and 3 HAM/TSP patients (■). This experiment was performed at the same time points as with panel A. (D) Representative histograms of intracellular IL-15 expression on CD14⁺ cells from ACs and a HAM/TSP patient before and after the culture for 5 hours. Staining with anti–Il-15 (open histogram) and IgG isotype control (grayed histogram) in CD14⁺ cells were shown.