METHODS The contents of ET-1 in lung of asthmatic guinea-pigs were measured with radioimmunoassay, and the expressions of ET-1, ETA, ETB and ECEmRNA with reverse transcription DNA polymerase chain reaction (RT-PCR).

• 方法 放免法测定肺组织ET-1,逆转录多聚酶链式反应(RT-PCR)方法检测ET-1、ETA、ETB和ECE的mRNA表达量。