一氧化氮前体物逆转肺动脉胶原堆积的研究

Study of Reversing Effect of Nitric Oxide Precursor on Collagen Accumulation in Pulmonary Artery

目的 :研究一氧化氮前体L -精氨酸 (L -Arg)对高肺血流量所致肺动脉高压大鼠肺动脉胶原代谢的干预作用及其机制。方法 :在大鼠行腹主动脉 -下腔静脉分流造成的肺动脉高压模型基础上 ,给予L -Arg灌胃 ,11wk后 ,采用免疫组织化学法检测大鼠肺动脉Ⅰ、Ⅲ型胶原蛋白的表达。结果 :分流组大鼠肺中、小型肺动脉中Ⅰ、Ⅲ型胶原表达与对照组比较明显增加 (P<0 01) ;分流 +L -Arg 组大鼠肺中、小型肺动脉中Ⅰ、Ⅲ型胶原表达较分流组明显降低 (P<0 01)。结论 :L -Arg 对高肺血流量所致胶原堆积具有重要的逆转作用。

OBJECTIVE:To study the therapeutic effect of L-arginine on collagen metabolism of pulmonary artery in rats with high pulmonary blood flow METHODS:The rat model of pulmonary hypertension was established with an abdominal aorta and inferior vena cava shunting L-arginine was intragastrically given to the rats with shunt in L-arginine group(1g/(kg·d)) for 11 weeks After 11 weeks of experiment,the expressions of collagen Ⅰ and collagen Ⅲ in pulmonary artery were detected by immunohistochemical assay RESULTS:The expressions of collagen Ⅰ and collagen Ⅲ in shunt group elevated obviously compared with those in control group(P<0 01) However,the expressing integral scores of collagen Ⅰ and collagen Ⅲ were significantly reduced in rats in shunt+L-arginine group (P<0 01) CONCLUSION:The results showed that L-ar_ginine could reverse the accumulation of collagen in pulmonary artery