低氧诱导大鼠肺泡巨噬细胞产生TNF-α的机制

目的：研究低氧诱导肺泡巨噬细胞低氧诱导因子-1α(HIF-1α)的表达及HIF-1α对肺泡巨噬细胞产生肿瘤坏死因子-α(TNF-α)的影响。方法：应用HIF-1α诱骗法(HIF-1α decoy)抑制低氧(3％O2，5％CO2，92％N2)培养的肺泡巨噬细胞中HIF-1α的作用，并用免疫组织化学、Western blot、半定量RT-PCR、酶联免疫吸附法(ELISA)分别检测HIF-1α蛋白、mRNA的表达和TNF-α的产生。结果：HIF-1α在常氧对照组肺泡巨噬细胞核中表达呈阴性，在低氧组和HIF-1α decoy组表达呈阳性；低氧组和HIF-1α decoy组中HIF-1α蛋白的含量显著高于常氧对照组(P<0.05)。HIF-1α mRNA的含量在低氧组和HIF-1α decoy组明显高于常氧对照组(P<0.05)；培养的巨噬细胞上清液中TNF-α的含量在低氧组(115±17 ng／L)明显高于常氧对照组(69±13 ng／L，P<0.05)和HIF-1α decoy组(81±15 ng／L，P<0.05)。结论： 低氧可明显诱导肺泡巨噬细胞HIF-1α的表达和活性增强，后者能促进TNF-α的产生，提示在可导致肺部低氧的炎症性疾病如COPD中HIF-1α可能发挥重要作用。     

低氧通过HIF-1α上调卵巢癌细胞SKOV3中HPA的表达

目的探讨低氧条件下卵巢癌细胞株SKOV3中低氧诱导因子-1α(HIF-1α),乙酰肝素酶(HPA)的表达变化及相互作用关系。方法分组孵育细胞株,用免疫细胞化学定性检测HPA蛋白,Western-blot和RT-PCR检测HIF-1α、HPA蛋白和mRNA。结果HPA蛋白定位于胞质。低氧12~36 h HIF-1α蛋白表达明显高于对照组(P<0.05),而mRNA变化不明显,HIF-1α抑制剂雷帕霉素可抑制蛋白表达水平。在低氧后各时间点HPA蛋白及mRNA表达均升高(P<0.05),雷帕霉素显著抑制HPA蛋白及mRNA表达。结论低氧可依赖HIF-1α途径增强HPA的表达,进而促进肿瘤的浸润转移。     

促红细胞生成素对荷瘤小鼠免疫功能的影响

目的:检测促红细胞生成素(Erythropoietin,EPO)对荷黑色素瘤小鼠免疫功能的影响.方法:将C57BL/6小鼠随机分为3组:正常对照组、盐水处理组和EPO处理组,盐水处理组和EPO处理组小鼠皮下接种黑色素瘤细胞B16.17天后,检测各组小鼠外周血中红细胞(RBC)、血红蛋白(Hb)、红细胞压积(Hct)和白细胞(WBC)数量及脾脏脏器指数;应用流式细胞术检测脾细胞CD4+、CD8+T细胞亚群的分布;ELISA检测血清中IL-2和TNF-α细胞因子的水平.结果:盐水处理组荷瘤小鼠外周血中RBC、Hb和Hct含量明显低于正常对照组小鼠(P＜0.05),应用EPO可明显提高荷瘤小鼠外周血中RBC、Hb和Hct含量及脾脏脏器指数(P＜0.05),三组小鼠外周血中WBC数量无明显差别(P＞0.05);盐水处理组及EPO处理组荷瘤小鼠脾脏CD4+T细胞百分率及CD4+/CD8+T细胞比值明显低于正常小鼠(P＜0.05).EPO处理组与盐水处理组相比,CD4+T细胞百分率无差别(P＞0.05),而CD8+T细胞百分率下降(P＜0.05),致使EPO处理组小鼠CD4 +/CD8+T细胞比值升高(P＜0.05);盐水处理组及EPO处理组荷瘤小鼠血清中TNF-α、IL-2含量明显低于正常小鼠(P＜0.05),EPO处理组小鼠血清中IL-2水平与盐水处理组相比增高(P＜0.05),但该两组小鼠血清中TNF-α含量无明显差别(P＞0.05).结论:EPO在改善荷瘤小鼠贫血状态的同时,还可通过提高外周血CD4 +/CD8+T细胞比值和IL-2含量而增强小鼠的免疫功能.     

低氧促进P19细胞向多巴胺能神经元分化

目的观察低氧对P19细胞神经分化的影响,针对其向多巴胺能神经元分化的现象及机制进行探讨。方法实验分为常氧组(20%O2)和低氧组(3%O2,每天低氧10 m in)。对诱导分化的神经元采用免疫细胞化学染色方法鉴定。用流式细胞术及W estern b lot检测多巴胺能神经元,高效液相色谱法测定分泌的多巴胺。用RT-PCR技术检测低氧诱导因子HIF-1αmRNA水平。结果①在分化的P19细胞中,低氧组神经元含量高于常氧组(P<0.05),低氧组多巴胺能神经元含量及所分泌的多巴胺显著高于常氧组(P<0.001);②低氧组诱导期HIF-1αmRNA表达水平明显高于常氧组。结论低氧可以促进P19细胞的神经分化,尤其促进P19细胞向多巴胺能神经元分化,HIF-1α可能在其中起了一定作用。     

慢性间歇性低氧对大鼠肾脏氧化应激损伤及HIF-1α表达的影响

目的:观察慢性间歇性低氧(CIH)大鼠肾组织形态学及其氧化应激相关指标变化,探讨CIH的肾损害机制。方法:将40只SD大鼠随机分为4组,CIH组2周和4周组(2IH和4IH)以及对照组2周和4周组(2C和4C),每组10只,采用化学比色法检测血清SOD活性,肾脏称重计算肾体比,HE染色、PAS染色和Masson染色法观察肾组织病理结构变化,real-time PCR法检测肾组织HIF-1α、Cu/Zn SOD和Mn SOD mRNA的表达变化。结果:(1)各组大鼠平均肾重、体重和肾体比差异无统计学意义(均P0.05);IH组大鼠肾组织存在病理损害,HE和PAS染色示肾小球系膜和基底膜轻度增生,肾小管上皮水肿,4周组损害较明显;Masson染色IH和对照组均未见纤维化改变。(2)化学比色法示IH组血清SOD活性低于相应对照组(均P0.05),4IH组下降更明显(P0.05)。Cu/Zn SOD和Mn SOD mRNA组间比较差异有统计学意义(均P0.05);Cu/Zn SOD mRNA表现为IH组低于相应对照组(均P0.05),4IH组与2IH组比较差异无统计学意义;Mn SOD mRNA的表达4IH组较4C组下调,差异有统计学意义(P0.05),4IH组明显高于2IH组(P0.05),2IH和2C组比较差异无统计学意义(P0.05)。IH组肾组织HIF-1α的mRNA表达均高于相应对照组(均P0.05),4IH组高于2IH组(P0.05)。结论:CIH可诱导大鼠肾小球、小管结构异常,但4周CIH尚未引起肾组织纤维化改变。CIH可通过上调HIF-1αmRNA和下调Cu/Zn SOD、Mn SOD mRNA的表达,参与氧化应激损伤过程。     

siRNA沉默HIF-1α对大鼠心肌细胞CT-1表达的影响

目的 研究低氧诱导因子-1α(HIF-1 α)在心肌细胞适应低氧环境中作用机制.方法 合成针对HIF-1α的siRNA片段,转染大鼠心肌细胞系H9C2.Real-time PCR检测HIF-1α和心肌营养素(CT-1) mRNA水平,Westernblot检测HIF-1α和CT-1蛋白水平.结果 低氧环境下,转染针对HIF-1α siRNA片段后HIF-1α mRNA水平、HIF-1 α蛋白质水平、CT-1 mRNA水平和蛋白水平均明显减低(P＜0.05).不进行转染时,CT-1 mRNA水平、HIF-1α蛋白和CT-1蛋白水平在低氧下比常氧下明显增高(P＜0.05).CT-1蛋白由对照组的0.34 ±0.05增至0.55 ±0.05(P＜0.05).结论 低氧情况下CT-1基因的调控作用有可能是通过低氧激活HIF-1α而诱导产生的,HIF-1α在心肌细胞适应低氧环境中具有重要作用.     

低氧增加人皮肤微血管内皮细胞系迁移并促进凋亡

目的研究低氧环境对人皮肤微血管内皮细胞(HDMEC)迁移、凋亡及相关因子HIF-1α、VEGF、i NOS基因及蛋白表达的影响。方法低氧培养人微血管内皮细胞,分为常氧组(对照组)和低氧组(Co Cl2模拟化学低氧)。CCK-8细胞生存实验确定合适处理浓度(200μmol/L Co Cl2),划痕实验检测细胞迁移能力,流式细胞技术观察细胞凋亡;用RT-PCR和Western blot技术检测HIF-1α、VEGF、i NOS mRNA和蛋白表达。结果与常氧组比较,低氧组细胞迁移能力增加(P0.05),凋亡增多(P0.05),均呈时间依赖性。低氧组HIF-1α、HIF-1β、VEGF、i NOS mRNA表达较常氧组比较均增加(P0.05),HIF-1α、VEGF、i NOS蛋白表达较常氧组比较均增加(P0.05),具有一定时间依赖性。结论低氧能增强人皮肤微血管内皮细胞迁移能力,并促进其细胞凋亡,其可能机制与HIF-1α、VEGF、i NOS蛋白表达升高有关。     

促红细胞生成素联合粒细胞集落刺激因子对大鼠缺氧心肌细胞的保护效应研究

目的 探讨促红细胞生成素(EPO)联合粒细胞集落刺激因子(G-CSF)对大鼠缺氧心肌细胞的保护机制.方法 采用胰酶消化大鼠心肌细胞并传代,用150 μmol/L浓度的CoCl2处理心肌细胞,模拟缺氧条件.采用流式细胞仪检测不同EPO+ G-CSF浓度下心肌细胞的凋亡和坏死水平.筛选出最适浓度后,将实验组分为对照组、缺氧组、缺氧+ EPO组、缺氧+G-CSF组和缺氧+EPO+ G-CSF组,Western blot法检测乏氧诱导因子(HIF)-1α、P53、PARP蛋白的表达变化.结果 心肌细胞在10 U/mLEPO+200 ng/mL G-CSF培养下,心肌细胞凋亡和坏死水平最低,故认为是最适浓度(F=14.73、11.95,P ＜0.05).和对照组相比,HIF-1α、P53和PARP蛋白在各实验组中表达水平均升高,HIF-1α以缺氧组升高最显著(F=22.65,P＜0.05),P53以缺氧+EPO+ G-CSF组升高最显著(F =25.18,P＜0.05).除对照组外,PARP蛋白在实验组中呈现逐渐降低趋势(F=17.48,P＜0.05).结论 EPO-G-CSF能降低缺氧的心肌细胞凋亡、坏死和DNA损伤,其机制可能与HIF-1α、P53、PARP蛋白表达相关.     

HIF-2α调控心肌细胞中IL-6表达对心肌缺血再灌注损伤的作用

目的 探讨缺氧诱导因子-2α(HIF-2α)调控心肌细胞中IL-6表达对心肌缺血再灌注损伤(MIRI)的作用.方法 8周龄SPF级雄性C57BL/6小鼠构建MIRI模型,一部分小鼠分为对照组(注射生理盐水)和HIF-2α shRNA组(注射含HIF-2αshRNA3的生理盐水),获取小鼠心肌细胞探讨HIF-2α对IL-6的调控和对MIRI的作用;一部分小鼠分为对照组(注射生理盐水)和IL-6 shRNA组(注射含IL-6 shRNA的生理盐水),获取小鼠心肌细胞探讨IL-6对MIRI的作用.结果 HIF-2α shRNA组缺氧/复氧后的心肌细胞凋亡率、心肌梗塞面积高于对照组(P＜0.05);缺氧/复氧处理后的心肌细胞HIF-2α及IL-6的蛋白表达量高于常氧环境下,HIF-2α shRNA组HIF-2α、IL-6的蛋白表达量低于对照组,差异均有统计学意义(P＜0.05);ChIP实验结果显示低氧状态下HIF-2α抗体募集的IL-6基因的启动区域的DNA丰富度高于常氧组(P＜0.05);IL-6 shRNA组缺氧/复氧后的心肌梗塞面积大于对照组(P＜0.05).结论 HIF-2α可保护心肌抗MIRI,同时参与转录调控IL-6的表达.     

576例献血者献血后血液中血红蛋白、红细胞、网织红细胞和胆红素的水平的变化研究

目的 分析献血者献血后血液中血红蛋白(Hb)、红细胞(RBC)、网织红细胞(RET)和胆红素(TBIL)水平变化.方法 选取2019年1月至12月在本院参与献血的健康志愿献血者576例为对象,分析比较不同时间点(采血前、采血后即刻、7 d和14 d)、不同献血次数和不同献血量志愿者血液中Hb、RBC、RET和TBIL水平.结果 576例献血者的采血前后的Hb、RET#和RET％水平比较,差异有统计学意义(P<0.05),其中Hb水平在采血后即刻下降(P<0.05),采血后7d恢复至采血前水平;RET#和RET％水平于采血后7d上升至最高水平(P<0.05);不同时间点的RBC和TBIL水平比较差异无统计学意义(P>0.05).200 mL组采血后7 d的RET#和RET％水平明显低于400mL组(P<0.05),两组献血者不同时间点的Hb、RBC和TBIL水平差异无统计学意义(P>0.05).初次献血组采血后7 d的Hb水平明显高于再次献血组,RET#和RET％水平明显低于再次献血组(P<0.05),两组献血者不同时间点的RBC和TBIL水平差异无统计学意义(P>0.05).相关性分析结果显示,献血量、献血次数与Hb、RET#和RET％水平均无明显相关性(P>0.05).结论 献血后血液中Hb和RET水平会发生明显变化,但献血量、献血次数与Hb、RET水平无明显相关性,不会影响机体的造血功能.     

HIF-1α介导了间歇低氧对人肺腺癌A549细胞体外生物学行为的影响

目的:探讨缺氧诱导因子1α(HIF-1α)是否介导间歇低氧对人肺腺癌A549细胞体外活力、凋亡以及侵袭的影响。方法:采用体外转染方法将特异性针对HIF-1α的siRNA导入A549细胞,在间歇低氧条件下培养后通过real-time PCR和Western blot法检测HIF-1α及其下游Bcl-2、Bax、P53、P21、VEGF的mRNA和蛋白表达;通过MTT法和流式细胞术分别检测A549细胞的活力、凋亡及细胞周期;通过Transwell小室检测A549细胞的侵袭能力。结果:未转染HIF-1α-siRNA的A549细胞[间歇低氧空白对照组(IHC组)、间歇低氧空载体对照组(IHE组)及间歇低氧阴性对照组(IHN组)]经间歇低氧干预后的HIF-1α、Bcl-2及VEGF表达均明显高于常氧对照组(RA组),Bax及P21表达均明显低于RA组(P0.05),而转染HIF-1α-siRNA的A549细胞[间歇低氧siRNA组(IHS组)]较IHC组、IHE组及IHN组经间歇低氧干预后的HIF-1α、BCL-2及VEGF表达均明显下调,Bax及P21表达较均明显上调(P0.05);所有间歇低氧组A549细胞的P53表达均较RA组升高(P0.05),但各间歇低氧组之间无显著性差异。IHC组、IHE组及IHN组A549细胞经间歇低氧干预后较RA组的细胞活力增强,凋亡率下降,侵袭力增强(P0.05),而IHS组A549细胞经间歇低氧干预后细胞周期被阻滞于G1期,较未转染组的细胞活力下降,凋亡增加,侵袭能力下降(P0.05)。结论:间歇低氧可通过HIF-1α途径调控其下游基因表达进而促进A549细胞的活力和转移;通过RNA干扰技术造成HIF-1α基因沉默可以抑制间歇低氧引起的A549细胞生长和转移。     

一种改良的间歇性低氧细胞模型方法

 目的: 研制细胞氧舱,建立间歇性低氧(intermittent hypoxia,IH)细胞模型并进行验证。方法: 定制细胞实验舱和空气模拟对照舱,根据氧分压-时间曲线设计间歇低氧模式。将人肺腺癌细胞A549随机分为正常对照(Con)组、间歇低氧6 h(6IH)组、间歇低氧9 h(9IH)组、空气模拟对照6 h(6AC)组、空气模拟对照9 h(9AC)组、持续低氧4 h(4SH)组、持续低氧6 h(6SH)组。暴露结束后光镜下观察细胞形态改变,real-time PCR、免疫组化法检测缺氧诱导因子1α(HIF-1α)的mRNA和蛋白表达变化。结果: 该模型间歇低氧模式为5% O₂ 60 min-20% O₂ 30 min,6个循环。与Con组比较,6AC、9AC组为原本细胞形态,6IH、9IH和6SH组部分细胞出现突起、变圆,胞质中出现较多黑色颗粒,细胞边界模糊,而4SH组未见明显异常。与6IH组比较,9IH组HIF-1α的mRNA和蛋白表达量明显增加(P<0.05);6IH和9IH组HIF-1α的mRNA 和蛋白分别高于4SH和6SH组(P<0.05);6AC、9AC组与Con组比较差异不显著。结论: 5% O₂ 60 min-20% O₂ 30 min的间歇性低氧-复氧细胞模式能模拟阻塞性睡眠呼吸暂停低通气综合征病理生理过程,是研究该疾病较理想的细胞模型。     

Changes in ventilatory adaptations associated with long-term intermittent hypoxia across the age spectrum in the rat

Intermittent hypoxia (IH) induces alterations in respiratory control that reflect various types of ventilatory plasticity. In freely behaving rats, acute exposure to IH elicits enhancements in normoxic minute ventilation (VE), termed ventilatory long-term facilitation. Exposure to longer time periods of IH induces unique ventilatory adaptations to intermittent hypoxia (VAIH). We hypothesized that long-term IH-induced ventilatory plasticity may be developmentally regulated and thus, IH exposures at progressively later post-natal ages may elicit differential effects on the magnitude of VAIH. To examine this issue, male Sprague-Dawley rats were exposed to 30 continuous days of IH beginning at post-natal ages 1, 10, 30, 60, 180, 360, and 540 days. Control animals were exposed to normoxic conditions with room air. Normoxic VE was significantly higher in IH-exposed rats (p < 0.01) except for the group in which IH was initiated at post-natal age 540 days (p = NS). The magnitude of VAIH was greatest in rats exposed in the immediate post-natal period and gradually diminished with advancing post-natal age. Enhanced normoxic VE was due to significant contributions from both frequency (p < 0.01) and tidal volume (p < 0.01), and could not be accounted for by changes in metabolic rate. We conclude that the magnitude of IH-induced ventilatory plasticity is age-dependent with progressive declines becoming apparent with advancing post-natal age.     

Expression of HIF-1alpha, VEGF and VEGF receptors in the carotid body of chronically hypoxic rat

We examined the protein expression and localization of HIF-1alpha, VEGF, VEGF receptors in the carotid body (CB) of rats breathing 10% inspired oxygen for up to 4 weeks. The immunoreactivity (IR) of HIF-1alpha was distributed numerously in the nuclei of glomus (type-I) and other cells since hypoxia for 1 day, but was faint and scattered in the normoxic CBs. Cytoplasmic staining of the VEGF was intense in glomus cells of the hypoxic but not the normoxic group. The IR levels of HIF-1alpha and VEGF reached plateau at 4 weeks, and the IRs of VEGFR-1 and VEGFR-2 were strongly positive in the hypoxic group. Yet, the expression of VEGFR-1-IR was mild, whereas the VEGFR-2-IR was intense in normoxic CBs, suggesting an upregulation of VEGFR-1 but not VEGFR-2 in hypoxia. Hence, HIF-1 may activate the expression of VEGF and VEGFR-1 in the CB and the expression of VEGF in the chemoreceptors may play a paracrine role in the vascular remodeling during chronic hypoxia.     

Inflammation induced by increased frequency of intermittent hypoxia is attenuated by tempol administration

The levels of serum inflammatory cytokines and the activation of nuclear factor kappa B (NF-κB) and hypoxia inducible factor-1α (HIF-1α) in heart tissues in response to different frequencies of intermittent hypoxia (IH) and the antioxidant tempol were evaluated. Wistar rats (64 males, 200-220 g) were randomly divided into 6 experimental groups and 2 control groups. Four groups were exposed to IH 10, 20, 30, or 40 times/h. The other 2 experimental groups were challenged with IH (30 times/h) plus tempol, either beginning on day 0 (IH30T0) or on day 29 (IH30T29). After 6 weeks of challenge, serum levels of tumor necrosis factor (TNF)-α, intracellular adhesion molecule (ICAM)-1, and interleukin-10 were measured, and western blot analysis was used to detect NF-κB p65 and HIF-1α in myocardial tissues. Serum levels of TNF-α and ICAM-1 and myocardial expression of NF-κB p65 and HIF-1α were all significantly higher in IH rats than in controls (P<0.001). Increased IH frequency resulted in more significant changes. Administration of tempol in IH rats significantly reduced levels of TNF-α, ICAM-1, NF-κB and HIF-1α compared with the non-tempol-treated group (F=16.936, P<0.001). IH induced an inflammatory response in a frequency-dependent manner. Additionally, HIF-1α and NF-κB were increased following IH administration. Importantly, tempol treatment attenuated this effect.     

低氧诱导因子1在低氧致肺动脉平滑肌细胞增殖中的作用

目的: 探讨低氧对肺动脉平滑肌细胞(PASMC)增殖和凋亡的影响,以及HIF-1α、P-ERK1/2、iNOS蛋白表达变化在其中的作用与意义。方法: 体外培养大鼠PASMC，设计常氧组、低氧组及ADM、L-NAME、PD98059干预组，用MTT比色法和PCNA的免疫组化法测定细胞增殖反应，用流式细胞仪检测细胞凋亡，用Western blotting法检测HIF-1α、P-ERK1/2、iNOS的蛋白表达。结果: （1）低氧24 h组的A值明显高于常氧组(P<0.01)，而PD98059及ADM干预组明显低于低氧组(P<0.01)， L-NAME干预组明显高于低氧组和常氧组(P<0.01)。（2）免疫组化表明，低氧24 h组呈阳性表达(P<0.01)。PD98059、ADM抑制了PCNA的表达(P<0.01)， L-NAME促进了PCNA的表达(P<0.01)。（3）各组在低氧培养24 h后，凋亡指数差异无显著(均P＞0.05)。（4）Western blotting表明常氧组少量HIF-1α、iNOS、 P-ERK1/2表达，低氧4 h后均表达增高(P<0.01),8 h仍维持在高峰(P<0.01)，而HIF-1α、P-ERK1/2在低氧24 h后表达下调。L-NAME促进了HIF-1α表达(P<0.01),PD98059部分抑制了HIF-1α、iNOS及P-ERK1/2表达(P<0.01)；ADM部分抑制了HIF-1α表达，促进iNOS表达(P<0.01)。结论: 低氧能促进肺动脉平滑肌细胞增殖，对细胞的凋亡无影响；HIF-1在低氧诱导肺动脉平滑肌细胞增殖中起重要作用。     

Hypoxia of sleep apnoea: cardiopulmonary and cerebral changes after intermittent hypoxia in rats

Sleep apnoea (SA) is common, especially in elderly people. In severe cases, arterial P(O2) may be lowered for a third or more in a night of sleep. To simulate the degree and duration of severe SA we exposed rats in a normobaric environmental chamber to 10% O(2) for 4h daily for 56 days (intermittent hypoxia: IH group) and compared them with rats continuously exposed for 8 weeks (continuous hypoxia: CH group) and control rats breathing room air (normoxic: N group). We found significant cardiopulmonary and cerebral changes. Right ventricular hypertrophy developed in IH and to a greater extent in CH. Small peripheral lung vessels developed thicker walls (assessed by a new method), which reduced their lumen, more in CH than IH. Coronal brain sections were immunostained for the glucose-transporter 1 (GLUT1) and the vascular endothelial growth factor (VEGF). The percentages of immunoreactivity in the frontal and temporal cortex, hippocampus, accumbens and putamen were determined by image-capture analysis. We noted GLUT1 immunoreactivity of the capillaries was similarly increased in all regions after CH but less so after IH. However, there was a significant linear trend in GLUT1 reactivity from N to IH to CH (R(2) = 0.73, P = 0.007) that was also confirmed by analysis of variance. The extent of VEGF-stained neurones and glial cells was significantly increased in all regions after IH but not after CH. This suggests that the signals for angiogenesis were complete or arrested after CH. Our findings have implications for the elderly subjected to hypoxic episodes during sleep apnoea.     

低氧对食管癌Eca109细胞体外迁移及侵袭的影响

 目的 探讨低氧对食管癌迁移及侵袭能力的影响及其作用机制。方法 采用CoCl2化学低氧法模拟肿瘤低氧微环境,半定量RT-PCR和免疫细胞化学分别检测不同低氧时相时食管癌Eca109细胞中低氧诱导因子-1α（HIF-1α）、E-钙粘蛋白及基质金属蛋白酶-2（MMP-2）mRNA及蛋白的表达。Western印迹法检测雷帕霉素联合低氧处理Eca109细胞后,HIF-1α、E-钙粘蛋白及MMP-2的变化。细胞划痕试验和Transwell实验检测雷帕霉素联合低氧对Eca109细胞迁移及侵袭能力的影响。结果 Eca109细胞在低氧状态下,HIF-1αmRNA无明显变化（P>0.05）,仅蛋白表达增多;E-钙粘蛋白的mRNA表达明显降低（P<0.05）,蛋白表达减少;MMP-2 mRNA表达明显升高（P<0.05）,蛋白表达增多。雷帕霉素在低氧状态下可显著抑制HIF-1α及MMP-2表达,促进E-钙粘蛋白高表达。经雷帕霉素处理后,Eca109细胞在低氧状态下,迁移速度减慢,侵袭穿膜细胞数减少（P<0.05）。结论 低氧使Eca109细胞中HIF-1α蛋白表达增多,后者可能通过下调E-钙粘蛋白、上调MMP-2表达促进食管癌在低氧状态下的迁移及侵袭。