Figure 1: Up regulation of interleukin-6 (IL-6) levels in HUVECs by T4 exposure. After treatments with T4 (50, 100 and 200 nmol/L) for 12, 24, and 48 h, protein expression was evaluated by ELISA method. *P < 0.05, ** P < 0.01, and *** P < 0.001, indicate significant differences in comparison with control group. Data are presented as mean ± SD. Values derived from three independent experiments. T4, thyroxin.