Table 1.

Levels of various cytokines in BEAS-2B cell media after WTC_2.5 exposure for 5 hr.

Cytokine	0	a25	50	100	200	100 b TiO2
IL-1β	c 1.00	d 3.10 ± 2.70	1.00 ± 0.65	1.42 ± 0.82	1.49 ± 0.27	4.90 ± 1.55
IL-2	1.00	1.87 ± 1.08	1.67 ± 0.37	1.60 ± 0.99	1.62 ± 0.31	1.67 ± 0.84
IL-4	1.00	2.08 ± 3.61	2.01 ± 1.81	2.05 ± 2.88	2.71 ± 2.78	12.2 ± 13.6
IL-5	1.00	1.20 ± 1.02	0.92 ± 0.05	0.79 ± 0.43	0.83 ± 0.40	2.52 ± 0.62
IL-8	1.00	1.73 ± 0.44	1.54 ± 0.39	1.54 ± 0.15	2.42 ± 0.03	2.33 ± 0.39
IL-10	1.00	1.69 ± 0.88	1.77 ± 0.62	2.16 ± 0.31	2.02 ± 0.63	2.51 ± 0.44
IL-12	1.00	0.00 ± 0.00	0.95 ± 0.86	1.89 ± 0.00	3.58 ± 0.84	7.58 ± 5.06
IL-13	1.00	1.48 ± 0.75	0.83 ± 0.52	1.13 ± 0.48	1.29 ± 0.43	1.54 ± 0.75
TNF-α	1.00	0.88 ± 0.59	0.64 ± 0.39	1.55 ± 1.03	1.88 ± 1.07	2.30 ± 1.25
IFN-γ	1.00	0.29 ± 0.44	0.12 ± 0.18	0.36 ± 0.33	0.51 ± 0.18	1.22 ± 0.96

^aLevel of WTC_2.5 (as μg/ml) used in the 5-hr exposure.

^bμg/ml used in the 5-hr exposure.

^cValue set to 1.00 for purposes of expressing relative change in cytokine level vs. that in unexposed control cultures.

^dValue is unit-less as it is calculated as relative change in levels (expressed here as mean relative cytokine level vs. that in unexposed control cultures [±SD]).