Ang1 induces PTC proliferation and migration via activating Tie2. (A) pcDNA3.1-Ang1 transfection upregulated Ang1 expression. (B) Tie2 shRNA silenced Tie2 expression. (C) An MTT assay was utilized to analyze the effect of Ang1 and Tie-2 on the proliferation of PTC cells. (D) A wound-healing assay was used to analyze the effect of expression Ang1 and Tie-2 on the migration of PTC cells. Ang1 group, PTC cells transfected with pcDNA3.1-Ang1. Tie2 shRNA group, PTC cells transfected with Tie2 shRNA. Data are presented as the mean ± standard deviation from three independent experiments. *P<0.01 vs. control group. Ang1, angiopoietin 1; Tie2, Ang receptor; PTC, papillary thyroid carcinoma; shRNA, short hairpin RNA.