Table 3. Treg-related cytokines in serum.

Cytokines	Con	ALI 6 h	ALI 24 h
IL-10 (pg/ml)	15.2 ± 2.5	10.4 ± 0.9*	6.1 ± 2.3**#
IL-2 (pg/ml)	21.5 ± 1.4	14.2 ± 1.3**	7.6 ± 1.2**#
IL-35 (pg/ml)	130.4 ± 0.5	119.3 ± 1.5**	112.1 ± 4.2**#

Con (normal control group, ambient air inhalation, n = 10), ALI 6 h (ALI group, smoke inhalation for 6 h, n = 10), ALI 24 h (ALI group, smoke inhalation for 24 h, n = 10); data are presented as mean ± S.E.M. *P < 0.05 and **P < 0.01 versus normal control group; ^#P < 0.05 and ^##P < 0.01 versus ALI 6 h group.