红景天甙对低氧培养的兔肺动脉平滑肌细胞增殖的抑制作用

Inhibitory effect of Salidroside on the proliferation of rabbit pulmonary artery smooth muscle cells under hypoxia

目的 :研究红景天甙 (Salidroside ,Sal)对低氧 ( 3 % )条件下兔肺动脉平滑肌细胞 (PASMC)增殖、DNA合成、细胞内钙离子浓度的影响。方法 :应用细胞培养、四唑盐比色试验 (MTT)、[3H]-胸腺嘧啶核苷 ( [3H]-TdR)掺入试验、Fluo- 3和激光扫描共聚焦显微术测定细胞内Ca2 +浓度等方法。结果 :低氧 2 4h可直接刺激PASMC ,使MTT的A值增加 62 % (P <0 0 5 ) ,[3H]-TdR掺入量增加 13 8% (P <0 0 1)。在低氧的PASMC培养液中加入Sal( 3 2× 10 -5mol/L)可抑制低氧的这种促增殖作用 ,与低氧组相比MTT的A值下降 2 9% (P <0 0 5 ) ,[3H]-TdR掺入量下降3 7%。在低氧的PASMC培养液中加入钙通道阻滞剂verapamil也可抑制低氧的促增殖作用 ,与低氧组相比较 ,MTT的A值下降 2 3 % (P <0 0 5 ) ,[3H]-TdR掺入量下降 5 1% (P <0 0 1)。PASMC的低氧培养可使细胞内Ca2 +浓度明显增加 (P <0 0 5 ) ,Sal可抑制低氧所致的细胞内Ca2 +浓度的上升。结论 :红景天甙可抑制低氧促进PASMC增殖、DNA合成的作用 ,其机制可能与抑制低氧时细胞内Ca2 +浓度增加有关。

AIM: To investigate the effect of Salidroside on the proliferation, DNA synthesis, intracellular Ca 2+ content of rabbit PASMC (pulmonary artery smooth muscle cells) under hypoxia. METHODS: Techniques of cell culture, MTT test, -TdR incorporation, fluo-3 and confocal laser scanning microscopy were used. RESULTS: The A value of MTT and -TdR incorporation of PASMC increased significantly by 62% (P<0.05) and 138% (P<0.01) after 24 h hypoxia. Salidroside (32×10 -5 mol/L) inhibited the action of hypoxia on the proliferation of PASMC, the A value of MTT and -TdR incorporation declined significantly by 29% (P<0.05) and 37% (P<0.01) compared with hypoxia group. A calcium channel blocker, verapamil could also inhibit the accelerative effect of hypoxia on the proliferation of PASMC. The intracelluler Ca 2+ content of PASMC raised markedly under hypoxia, but the effect of hypoxia on the intracelluler Ca 2+ content could be inhibited by Salidroside. CONCLUSION: Salidroside inhibited the proliferation, DNA synthesis of PASMC induced by hypoxia. The inhibitory action of Salidroside on the increase in intracellular Ca 2+ concentration under hypoxia might be one of the mechenisms.