MMP-9 activity was assessed in supernatants from HBECs stably transfected with pEGFPc1 -antisense-ET-1 converting enzyme(ECE) RNA.

• 明胶聚丙烯酰胺凝胶电泳酶谱法检测稳定转染ET - 1转换酶 (ECE)反义核酸上皮细胞培养上清MMP - 9酶活性。