NF-κB的活性和iNOS基因表达在低氧性肺动脉高压中的变化

Changes of nuclear factor-κB and inducible nitric oxide synthase in hypoxic pulmonary hypertension

目的 :探讨NF -κB的活性及iNOS基因表达在低氧性肺动脉高压 (HPH)发病过程中的变化。方法 :复制低氧性肺动脉高压大鼠模型 ,用免疫组化、原位杂交、半定量逆转录 -聚合酶链式反应 (RT -PCR)和Westernblot等方法进行检测。结果 :iNOSmRNA在腺泡内肺动脉 (IAPA)的表达 ,低氧 2 8d(H2 8d)组染色强于正常 (N)组、低氧 5d(H5d)组和低氧 1 4d(H1 4d)组。半定量RT -PCR证实低氧肺组织iNOSmRNA含量在H2 8d组分别是N组、H5d组和H1 4d组的 2 1倍、1 9倍和 1 8倍。H2 8d组肺组织NF -κB的核染色增多 ,I-κBa的含量在N组、H5d组和H1 4d组分别是H2 8d组的 2 7倍、2 8倍和 2 5倍。结论 :在HPH中NF -κB的激活可能与低氧肺血管构建及iNOSmRNA的表达有关。

AIM:To observe the changes of nuclear factor-κB (NF-κB) activity and inducible nitric oxide synthase (iNOS) expression in hypoxic pulmonary hypertension(HPH). METHODS:The rat model of HPH was used. The NF-κB activity and iNOS expression in lung tissue were determined by immunohistochemistry(IHC), in situ hybridization (ISH), RT-PCR and Western blot.RESULTS:ISH showed that iNOS mRNA expression in intraacinar pulmonary arteriole (IAPA) in H28 d group(hypoxic treatment for 28 days) was stronger than that in normal group, H5d group and H14 d group. RT-PCR showed that the iNOS mRNA in H28 group was 2.1 times, 1.9 times and 1.8 times higher than that in normal group, H5d group and H14 d group, respectively. The nucleic anti-NF-κB stain was observed in H28 d group, which was significantly stronger, but the I-κB amount was 2.8 times, 2.7 times and 2.5 times lower than that in normal group, H5d group and H14 d group, respectively. CONCLUSION: The activity of NF-κB was correlated with the hypoxic pulmonary vessel structural remodeling and iNOS expression.