Over-expressed JAZF1 promotes angiogenesis and silencing of JAZF1 inhibits angiogenesis in CMECs. (a), formation of blood vessel observed under the inverted microscope (× 100); (b), the number of blood vessel formed in each group; (c), the length of blood vessel formed in each group; *, p < 0.05 vs. the normal group; #, p < 0.05 vs. the blank, empty vector and NC shRNA group; NC, negative control; shRNA, short hairpin RNA; CMECs, cardiac microvascular endothelial cells; JAZF1, the juxtaposed with another zinc finger protein 1.