低氧对肺血管周细胞增殖及分化的影响

目的研究低氧对肺血管周细胞增殖及分化的影响，探讨低氧性肺动脉高压时无肌型肺动脉肌化的细胞来源。方法实验分为４组：直接低氧组（Ｈ组），常氧组（Ｎ组），低氧内皮细胞条件培养液组（ＨＥＣＣＭ组），常氧内皮细胞条件培养液组（ＮＥＣＣＭ组）。应用细胞培养、３Ｈ胸腺嘧啶核苷（３ＨＴｄＲ）、免疫细胞化学、图像分析等技术，研究低氧对肺血管周细胞３ＨＴｄＲ的掺入量、增殖细胞核抗原（ＰＣＮＡ）、α平滑肌肌动蛋白（αＳＭＡｃｔｉｎ）表达的影响。结果Ｈ组周细胞３ＨＴｄＲ的掺入量、ＰＣＮＡ及αＳＭＡｃｔｉｎ的表达量分别是Ｎ组的２．１６倍（Ｐ＜０．０１）、１．１６倍（Ｐ＜０．０１）及１．１１倍（Ｐ＜０．０５），ＨＥＣＣＭ组周细胞３ＨＴｄＲ的掺入量、ＰＣＮＡ及αＳＭＡｃｔｉｎ的表达量分别是ＮＥＣＣＭ组的１．８倍（Ｐ＜０．０１）、１．１５倍（Ｐ＜０．０１）及１．１２倍（Ｐ＜０．０５）。结论低氧可直接或刺激内皮细胞分泌某些细胞因子促进肺血管周细胞增殖、并向平滑肌样细胞分化。肺血管周细胞的增殖、向平滑肌样细胞分化是低氧性肺动脉高压无肌细动脉肌化的重要细胞来源

Effect of hypoxia on proliferation and differentiation of the pulmonary vascular pericytes

OBJECTIVE: To study the effect of hypoxia on proliferation and differentiation of the pulmonary vascular pericytes (PC). METHODS: Cell culture, (3)H-thymidine incorporation ((3)H-TdR), immunocytochemistry and image analysis methods were used. RESULTS: It was found that the (3)H-thymidine incorporation, the expression amounts of proliferating cell nuclear antigen (PCNA) and alpha-smooth muscle actin (alpha-SM-Actin) in direct hypoxia (H) group was 2.16 times (P < 0.01), 1.16 times(P < 0.01) and 1.11 times (P < 0.05) that of normoxia (N) group, in hypoxic endothelial cell conditioned medium (HECCM) group was 1.8 times (P < 0.01), 1.15 times (P < 0.01) and 1.12 times (P < 0.05) that of normoxic endothelial cell conditioned medium (NECCM) group. CONCLUSIONS: It was suggested that hypoxia can stimulate pulmonary artery endothelial cells (PAEC) to secrete some growth factors to enhance PC proliferation and transformation of smooth muscle-like cells.