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IL-15 up-regulates cell surface expression of CD54 in human respiratory epithelial A549 cells. Cells were incubated for 24 h with buffer (Ctrl), 100 ng/ml TNF-α (A), 1000 ng/ml TNF-α (C), or IL-15. Cell surface expression of (a) CD50, (b) CD54 and (c) CD106 was monitored by flow cytometry as described in Methods. Results are means ± SEM (n = 3). *P < 0·05 versus control (Ctrl) by anova.
