中国急救医学
中國急救醫學
중국급구의학
CHINESE JOURNAL OF CRITICAL CARE MEDICINE
2015年
6期
553-556
,共4页
李庆勇%钱志远%卞中国%丁春龙
李慶勇%錢誌遠%卞中國%丁春龍
리경용%전지원%변중국%정춘룡
创伤性颅脑损伤( TBI)%缺氧诱导因子-1α( HIF-1α)%二甲基雌氧二醇%神经血管单元( NVU)%促血管再生策略
創傷性顱腦損傷( TBI)%缺氧誘導因子-1α( HIF-1α)%二甲基雌氧二醇%神經血管單元( NVU)%促血管再生策略
창상성로뇌손상( TBI)%결양유도인자-1α( HIF-1α)%이갑기자양이순%신경혈관단원( NVU)%촉혈관재생책략
Traumatic brain injury( TBI)%Hypoxia-inducible factor-1α( HIF-1α)%2-methoxyestradiol%Neurovascular unit(NVU)%Pro-angiogenic strategies
目的:探索大鼠创伤性颅脑损伤( TBI)后缺氧诱导因子-1α( HIF-1α)的动态表达及其作用机制。方法96只雄性SD大鼠随机分为对照组、假手术组、TBI组、药物干预组。采用改良Feeney方法制作TBI模型,利用HIF-1α阻滞剂二甲基雌氧二醇(2-ME-2,2.5 mg/kg)对实验组进行药物干预;利用RT-PCR、Western blot等分子生物学技术分别观察不同时间点脯氨酸羟化酶区域蛋白2( PHD2)、HIF-1α及血管内皮细胞生长因子( VEGF)、Ang-1的表达情况。结果 TBI组HIF-1α表达较对照组和假手术组明显增加,HIF-1α于6 h表达开始增加,24 h~3 d达高峰,7 d后下降至正常水平,其表达增加与PHD2蛋白降解有关;2-ME-2干预后HIF-1α、VEGF、Ang-1表达较TBI组下降。结论 TBI后HIF-1α表达增加,诱导血管再生相关基因VEGF、Ang-1的表达,促进损伤血管的修复和再生。
目的:探索大鼠創傷性顱腦損傷( TBI)後缺氧誘導因子-1α( HIF-1α)的動態錶達及其作用機製。方法96隻雄性SD大鼠隨機分為對照組、假手術組、TBI組、藥物榦預組。採用改良Feeney方法製作TBI模型,利用HIF-1α阻滯劑二甲基雌氧二醇(2-ME-2,2.5 mg/kg)對實驗組進行藥物榦預;利用RT-PCR、Western blot等分子生物學技術分彆觀察不同時間點脯氨痠羥化酶區域蛋白2( PHD2)、HIF-1α及血管內皮細胞生長因子( VEGF)、Ang-1的錶達情況。結果 TBI組HIF-1α錶達較對照組和假手術組明顯增加,HIF-1α于6 h錶達開始增加,24 h~3 d達高峰,7 d後下降至正常水平,其錶達增加與PHD2蛋白降解有關;2-ME-2榦預後HIF-1α、VEGF、Ang-1錶達較TBI組下降。結論 TBI後HIF-1α錶達增加,誘導血管再生相關基因VEGF、Ang-1的錶達,促進損傷血管的脩複和再生。
목적:탐색대서창상성로뇌손상( TBI)후결양유도인자-1α( HIF-1α)적동태표체급기작용궤제。방법96지웅성SD대서수궤분위대조조、가수술조、TBI조、약물간예조。채용개량Feeney방법제작TBI모형,이용HIF-1α조체제이갑기자양이순(2-ME-2,2.5 mg/kg)대실험조진행약물간예;이용RT-PCR、Western blot등분자생물학기술분별관찰불동시간점포안산간화매구역단백2( PHD2)、HIF-1α급혈관내피세포생장인자( VEGF)、Ang-1적표체정황。결과 TBI조HIF-1α표체교대조조화가수술조명현증가,HIF-1α우6 h표체개시증가,24 h~3 d체고봉,7 d후하강지정상수평,기표체증가여PHD2단백강해유관;2-ME-2간예후HIF-1α、VEGF、Ang-1표체교TBI조하강。결론 TBI후HIF-1α표체증가,유도혈관재생상관기인VEGF、Ang-1적표체,촉진손상혈관적수복화재생。
Objective To investigate the expression of hypoxia-inducible factor-1α( HIF-1α) and its related mechanism.Methods Ninety-six Male SD rats were divided into four groups:Control group (n=8), Sham group (sham operate, n=8), traumatic brain injury group (TBI group, n=40), TBI treated with 2ME2 group (n=40).TBI model refers to Feeney's method.At the time point 6 h, 24 h, 3 d, 7 d, 14 d after modeling, RT -PCR and Western blotting analysis were respectively used to determine the expression level of PHD2/HIF -1α/VEGF/Ang -1 mRNA and protein.Results Compared with sham-operated controls, the expression of HIF-1αin TBI group has been significantly enhanced ( P <0.05 ) , which related to the degradation of PHD2 following TBI induction.HIF-1αexpression started to increase 6 h after TBI modeling; it kept an increased level within 24 h and reached to a peak 3 d after TBI;and fell to common levels seven days after TBI.While VEGF/Ang-1 expression was significant (P<0.01) decreased after inhibition of HIF-1αby 2 -ME-2.Conclusion The expression of HIF-1αincreased after experimental TBI, which can induce its downstream target gene expression to promote the repairment of injured vascular and angiogenensis.