肺微动脉内皮细胞对肺动脉张力的调节作用

本文研究体外培养的兔肺微动脉内皮细胞对肺动脉张力的调节作用。常氧和缺氧培养24小时后的肺微动脉内皮细胞条件培养液均不能收缩肺动脉条,用乙醚提取后的水相则能引起肺动脉肌条发生明显收缩反应,常氧和缺氧培养组间无明显差异,水相加热后,常氧和缺氧培养组的内皮细胞条件培养液对肺动脉肌条的收缩作用明显下降,但缺氧培养组的收缩幅度明显高于常氧培养组,用胰蛋白酶处理后,各组的收缩活性均消失。用消炎痛、巯甲丙脯酸处理缺氧组的内皮细胞或向收缩反应池内加入FPL55712、BN52021、扑尔敏、哌唑嗪对条件培养液的收缩活性无明显影响。结果提示:在培养的兔肺微动脉内皮细胞产生的长半衰期血管活性物质中,脂溶性物质可能舒张肺动脉,缺氧不影响此物质的产生,水溶性物质包括不耐热的和耐热的,均能收缩肺动脉,前者在缺氧时产生减少,后者可能是一种肽类,缺氧使之产生增加。

The regulatory effect of endothelial cells of pulmonary arteriole on the tone of pulmonary artery

The regulatory effect of endothelial cells of the rabbit pulmonary arteriole(PAECs) on the tone of pulmonary artery was studied. The conditioned medium (CM) ofPAECs, cultivated under normal and hypoxic condition for 24 hours, did not induce con-striction of pulmonary artery ring. The aqueous phase was able to induce the constriction.The constriction of pulmonary artery rings was reduced by the heated aqueous phase, but it was disappeared when the heated aqueous phase was treated with trypsin. The constric-tion caused by heated aqueous phase was stronger in hypoxic endothelial cells than innormal cells. Treatment of PAECs with indomethacin and captoril, and administration ofFPL 55712, BN 52021, chlorpheniramine and prazozin to contraction pool did not affectthe constriction of pulmonary artery rings. It was concluded that PAECs might producelong half-life lipid substances which could induce the dilatation of pulmonary artery.Hypoxia inhibted the release of long half-life aqueous heat-unstable vasoconstrictive sub-stances. but enhanced that of the heat-stable fraction which was probably a peptide.