缺氧性腺泡内肺动脉构形重组的形态定量研究

目的观察中药黄芪对缺氧性肺动脉高压及肺腺泡内动脉结构改建的抑制作用。方法６０只大白鼠随机分成缺氧组、缺氧＋黄芪组、正常对照组（各组２０只）。缺氧组、缺氧＋黄芪组大鼠在常压缺氧（１０％Ｏ２１０小时／天）下喂养，在实验第１５天、３０天每组分别取１０只进行右心室收缩压、右心室肥大指数测定后处死，再对肺腺泡内动脉进行光镜、电镜观察及形态学定量分析。结果在实验第３０天后，右心室收缩压，在缺氧组高于缺氧＋黄芪组１８倍（Ｐ＜０．０５），右心室肥大指数，在缺氧组高于缺氧＋黄芪组１３倍（Ｐ＜０．０５），腺泡内动脉中层厚度高于缺氧＋黄芪组２３倍（Ｐ＜０．０５）；肺腺泡内动脉外膜单位面积的纤维母细胞数（密度）在缺氧组是１３１±０３（Ｐ＜０．０５），在缺氧＋黄芪组是７６０±０１９（Ｐ＜０．０５）。结论黄芪抑制了肺腺泡内动脉壁细胞增生及扩张肺动脉，黄芪在抑制肺动脉高压结构改建中可能起重要作用

Morphometric investigation on hypoxic structural remodeling of intraacinar pulmonary arteries

OBJECTIVE: To observe the inhibitory effects of Radix Astragali (RA) on hypoxic structural remodeling of intraacinar pulmonary arteries (IAPA) and pulmonary hypertension (PHT). METHOD: 60 rats were divided into H (hypoxia) group (n = 20 rats) H + RA group (n = 20) and normal control (C) group (n = 20). The rats of H group and H + RA group were fed in hypoxic environment under normal atmospheric pressure (10% O2, 10 hours/day). On the 15th and 30th day of hypoxia, right ventricular systolic pressure (RVSP) and right ventricle hypertrophy index (RVHI) were measured and pulmonary vessel changes were studied under light and electron microscope with morphometric analysis. RESULT: Compared with H + RA group on 30th day, RVSP in H was 1.8 time as high as that of H + RA(P < 0.05); RVHI in H was 1.3 time as high as that of H + RA (P < 0.05); the media thickness of IAPA in H was 2.3 time as high as that of H + RA (P < 0.05); the density of adventitial fibroblasts of IAPA was 13.1 +/- 0.3 (H) and 7.6 +/- 0.2 (H + RA) (P < 0.05). CONCLUSION: Preserving the IAPA wall cells and dilating IAPA by RA may play an important role in inhibiting remodeling of IAPA and PTH.