卡托普利通过抑制CCL-2表达缓解大鼠急性放射性肺损伤的机制研究

目的 研究卡托普利对大鼠急性放射性肺损伤的抑制作用及可能机制。方法 将64只雌性Wistar大鼠随机分为对照组、照射组和照射+卡托普利低/高剂量组。除对照组外,其余各组均给予右肺单次20 Gy照射建立大鼠急性放射性肺损伤模型。于第1、2、4、8周处死大鼠HE染色观察大鼠肺组织变化,RT-qPCR、蛋白印迹法分别检测肺组织中CCL-2mRNA水平及蛋白含量,免疫组化检测各组大鼠肺组织中巨噬细胞(CD₆₈)数量。采用单因素方差分析。结果 卡托普利能够减轻急性放射性肺损伤大鼠肺组织炎症反应(P<0.05),抑制单核细胞在损伤肺组织中聚集(P<0.05),降低CCL-2在大鼠肺组织中的含量(P<0.05)。结论 卡托普利可能通过降低CCL-2的表达,从而抑制单核细胞在急性放射性肺损伤大鼠肺组织中的聚集,进而减轻炎症反应。

Captopril attenuates lung inflammation through inhibiting the expression of CCL-2 in rats with acute radiation-induced lung injury

Objective To explore the inhibitory effect of captopril on acute radiation-induced lung injury in rats and the possible mechanism. Methods Sixty-four female Wistar rats were randomly divided into control group, irradiation group, irradiation+low-dose captopril group, and irradiation+high-dose captopril group. A single dose of 20 Gy was given to the right lung of all rats except those in the control group to establish a rat model of acute radiation-induced lung injury. These rats were sacrificed at 1, 2, 4, and 8 weeks. HE staining was used to observe the pathological changes in lung tissue;RT-PCR and Western blot were used to measure the mRNA and protein expression of CCL-2 in lung tissue;immunohistochemical assay was used to determine the number of monocytes ( CD68 ) in lung tissue. A one-way analysis of variance was performed. Results Captopril significantly reduced lung inflammation in rats with acute radiation-induced lung injury (P<005), inhibited the accumulation of monocytes (CD68) in lung tissue (P<005), and decreased the content of CCL-2 in lung tissue ( P<005 ) . Conclusions For rats with acute radiation-induced lung injury, captopril can reduce the expression of CCL-2 to inhibit the accumulation of monocytes in lung tissue and thus attenuate lung inflammation.