Change and significance of HIF-1α mediated by TLR4 signal pathway in the model of lung ischemia reperfusion injury rats
Caikai·Shareli1 XU Sicheng1 LI Chao1 DONG Xu'nan2
1.Department of RICU, Respiratory and Respiratory Critical Care Center, the First Affiliated Hospital of Xinjiang Medical University, Xinjiang Uygur Autonomous Region, Urumqi 830054, China;
2.The Fifth Affiliated Hospital of Xinjiang Medical University, Xinjiang Uygur Autonomous Region, Urumqi 830011, China
Abstract:Objective To investigate the changes and significance of hypoxia inducible factor-1α (HIF-1α) mediated by Toll like receptor 4 (TLR4) signal pathway in the model of lung ischemia reperfusion injury (IRI) rats. Methods A total of 48 healthy male SD rats were selected and randomly divided into sham operation group, IRI model group, TLR4 activation group (LPS intervention) and TLR4 inhibition group (TAK-242 intervention) with 12 rats in each group. 3 weeks before model, IRI model group and sham operation group were injected with saline, TLR4 activation group was injected with lipopolysaccharide, TLR4 inhibition group was injected with TAK-242, once a week for three weeks. IRI model group, TLR4 activation group and TLR4 inhibition group were established a model of lung ischemia-reperfusion injury after last injection 30 minutes, sham operation group was treated same as the other groups except for not block the lung door. 3 hours after reperfusion injury, TLR4, HIF-1α, tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6) mRNA expression of lung tissue were tested by reverse transcriptase polymerase chain reaction (RT-PCR). TLR4, HIF-1α, TNF-α and IL-6 protein expression of lung tissue were tested by Western-blot. Results The lung wet weight/dry weight ratio of the IRI model group was higher than that of the sham operation group (P < 0.05), the TLR4 activation group was higher than that of the model group (P < 0.05), and the TLR4 inhibition group was lower than that of the model group (P < 0.05). The mRNA and protein expression levels of TLR4, HIF-1α, TNF-α, IL-6 in the lung tissues of IRI model group were higher than those of the sham operation group (P < 0.05), the TLR4 activation were higher than those of the model group (P < 0.05), and the TLR4 inhibition group were lower than those of the model group (P < 0.05). Conclusion The TLR4 signal pathway in the lung tissue mediates the HIF-1α expression increased significantly after lung ischemia-reperfusion injury in rats, and increases the degree of inflammatory damage to the lung tissue.
才开·莎热丽1 徐思成1 李超1 董旭南2. 大鼠肺缺血再灌注损伤模型中TLR4信号通路介导HIF-1α的变化及其意义[J]. 中国医药导报, 2017, 14(15): 18-21,34.
Caikai·Shareli1 XU Sicheng1 LI Chao1 DONG Xu'nan2. Change and significance of HIF-1α mediated by TLR4 signal pathway in the model of lung ischemia reperfusion injury rats. 中国医药导报, 2017, 14(15): 18-21,34.