细胞因子和水钠通道蛋白在急性肾损伤致肺损伤中的作用(3)

作者:马涛 刘志 更新时间:2013-04-02 02:59 点击:
【论文发表关健词】急性肾损伤;急性肺损伤;细胞因子;水通道蛋白1;肺上皮钠通道
【职称论文摘要】
+ -K + -ATP 酶和AQP组成, 即由肺泡上皮细胞的腔侧钠通道摄取Na + ,然后经基底侧表面的Na + -K + - ATP酶将Na + 泵至肺间质,同时伴随水的被动吸收。而水除伴随钠的主动转运外,还经肺泡上皮细胞表面的水通道排出

+ -K+ -ATP 酶和AQP组成, 即由肺泡上皮细胞的腔侧钠通道摄取Na+,然后经基底侧表面的Na+-K+- ATP酶将Na+泵至肺间质,同时伴随水的被动吸收。而水除伴随钠的主动转运外,还经肺泡上皮细胞表面的水通道排出[15-16]。已有许多文献证实,急性肺损伤或急性呼吸窘迫综合征时肺表达AQP与ENaC都减少[2,14-19]
本实验结果提示在急性肾损伤的过程中肺AQP1及α-ENaC表达下降,细胞因子起了重要的作用。Dagenais等[20]也发现了TNF-α可以引起肺表达α-ENaC下降。同时也有文献证实细胞因子参与了水通道蛋白的调节[21-22]。ARDS时,活化的中性粒细胞和肺泡巨噬细胞迁移入肺,产生肿瘤坏死因子、细胞生长因子(TGF) 以及一氧化氮(NO) 等活性氧,这些有害因子与血红素结合后可增加细胞内cGMP水平,再通过cGMP 依赖的蛋白磷酸化发挥效应,从而使肺AQP1及α-ENaC表达下降。此外,应激反应、高渗、缺氧、pH、Ca2+均可以参与调节AQP1及α-ENaC的表达[23-24]
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