酒精对大鼠血管内皮细胞的促凋亡作用

目的探讨酒精对大鼠血管内皮细胞的促凋亡作用及其机制。方法选择24只雄性健康普通级S—D大鼠，分为对照组6只和实验组18只，验组又按处死时间分为4周（实验1组）、6周（2组）、8周（3组）各6只，通过大鼠酒精灌胃制备动物实验模型，选用内皮细胞平铺、H—E染色、TUNEL和分光光度法，探讨了酒精在一定剂量、不同持续时间对大鼠血管内皮细胞的促凋亡作用及机制。结果H—E染色及TUNEL法对照组均未见凋亡细胞，而实验各组均可见凋亡细胞，实验各组和对照组MDA、T—AOC间差异有非常显著性意义（P〈0．01）。结论过量饮酒使体内氧化-抗氧化系统严重失衡，进而导致内皮细胞凋亡。     

缺氧复氧损伤诱导内皮细胞凋亡及卡托普利的晚期干预作用

目的 探讨缺氧复氧对血管内皮细胞凋亡的影响及卡托普利延迟预处理机制.方法 建立人脐静脉内皮细胞缺氧复氧损伤模型,用流氏细胞仪检测不同的缺氧和复氧时间以及卡托普利晚期预处理,应用缓激肽β2受体阻断剂、PKC阻断剂、一氧化氮合酶阻断剂和NF-κB阻断剂,分别与卡托普利共同孵育细胞,24 h后再对内皮细胞行缺氧复氧损伤,观察不同条件下内皮细胞DNA周期和Annexin V染色率及细胞凋亡情况的变化.结果 单纯缺氧和缺氧复氧均可引起血管内皮细胞凋亡,并且随着单纯缺氧和缺氧后复氧时间的延长,凋亡峰面积和Annexin V染色率逐渐增加.卡托普利晚期预处理后,细胞凋亡明显减少,并且在本实验特定的浓度中（10-2～10-4 mmol/L）,凋亡峰面积随卡托普利剂量的增加而逐渐增强.但给予上面4种阻断剂后,卡托普利的晚期预处理抗凋亡作用均部分消失.结论 单纯缺氧和缺氧复氧均可以导致细胞凋亡,且具有时间依赖性.卡托普利晚期预处理可以减轻内皮细胞凋亡,此作用具有剂量依赖性.这一过程涉及缓激肽β2受体、PKC途径、一氧化氮和核因子的转录等多种因素的参与.     

三七总皂苷对血管内皮细胞凋亡及凋亡调控基因的影响

目的探讨血管紧张素Ⅱ(Ang Ⅱ)在不同浓度和不同作用时间下对内皮细胞凋亡率及凋亡调控基因(Fas)的作用及三七总皂苷对其影响.方法采用流式细胞技术测定在血管紧张素Ⅱ不同浓度和不同作用时间下,内皮细胞凋亡率及Fas和Bcl-2表达量的变化.结果血管紧张素Ⅱ可明显促进凋亡率及Fas的表达量,且其作用呈剂量依赖性和时间依赖性;经药物处理后的内皮细胞对AngⅡ的反应完全不同,凋亡率明显降低,同时Fas的表达量随药物浓度增加和作用时间延长而降低,Bcl-2则增高.结论血管紧张素Ⅱ具有明显的促进细胞凋亡和凋亡基因表达的作用;三七总皂苷对细胞凋亡和Fas表达有一定的调节作用.     

肝细胞生长因子对糖基化终产物诱导内皮细胞凋亡的影响

目的探讨糖基化终产物对内皮细胞的凋亡作用,以及肝细胞生长因子对内皮细胞凋亡的影响。方法体外培养人脐静脉内皮细胞,予不同浓度糖基化终产物及肝细胞生长因子干预,分为实验对照组及100 mg/L、200mg/L4、00 mg/L糖基化终产物组和400 mg/L糖基化终产物 100μg/L肝细胞生长因子组,采用四甲基偶氮唑蓝比色法测定各组内皮细胞生长抑制率,通过吖啶橙荧光染色观察细胞形态学变化,流式细胞术测定Annexin V-FITC/PI双染标记的细胞凋亡率,检测肝细胞生长因子对糖基化终产物诱导内皮细胞凋亡的影响;蛋白免疫印迹法分析各组凋亡基因Bax、Bcl-2蛋白的表达及酶联反应法测定细胞凋亡蛋白酶3的活性。结果肝细胞生长因子能明显降低糖基化终产物对内皮细胞生长的抑制作用(P<0.01);糖基化终产物诱导培养的内皮细胞出现明显的凋亡形态学改变,在一定浓度范围内,内皮细胞凋亡率与糖基化终产物的浓度和作用时间呈依赖关系,肝细胞生长因子干预后可显著降低不同时间的内皮细胞凋亡率(P<0.05);肝细胞生长因子作用内皮细胞抗凋亡基因Bcl-2表达明显升高(P<0.01),而促凋亡基因Bax表达无明显变化(P>0.05);细胞凋亡蛋白酶3活性显著降低(P<0.05)。结论糖基化终产物诱导人内皮细胞凋亡,而肝细胞生长因子抑制糖基化终产物诱导的内皮细胞凋亡,其作用机制可能是上调抗凋亡基因Bcl-2水平、抑制细胞凋亡蛋白酶3的激活。     

α-硫辛酸对高糖诱导的血管内皮细胞凋亡的保护作用

目的 观察α-硫辛酸对高糖诱导的血管内皮细胞凋亡是否有保护作用.方法 以不同浓度α-硫辛酸干预高糖作用下的血管内皮细胞(ECV304),共同孵育72h,以Annexin-FITC/PI双染流式细胞术和TUNEL法检测细胞凋亡.结果 高糖明显增加内皮细胞凋亡(P＜0.01);以不同浓度α-硫辛酸干预,内皮细胞凋亡明显减少(P＜0.01),这种作用具有浓度依赖性.结论 α-硫辛酸对高糖诱导的血管内皮细胞凋亡有保护作用.     

吡格列酮通过内质网应激致凋亡途径对大鼠血管平滑肌细胞钙化的影响

目的　探讨吡格列酮通过内质网应激致凋亡途径对大鼠血管平滑肌细胞钙化的影响及机制。方法　利用β-甘油磷酸钠联合丙酮酸钠制备钙化血管平滑肌细胞模型,予不同浓度（10、50、100　μmol/L）吡格咧酮干预。用Von　Kossa　染色、茜素红S染色测定钙含量以及碱性磷酸酶（ALP）活性观察细胞钙化程度。采用流式细胞术及Tunel法检测细胞凋亡率,实时荧光定量PCR及Western　Blot检测各组细胞GRP78、Caspase-12和Runx2的mRNA及蛋白表达。结果　钙化组其钙含量、ALP活性较对照组细胞增多（P<0.05）,而不同浓度吡格列酮呈剂量依赖性地减轻钙化大鼠血管平滑肌细胞的钙含量和ALP活性（P<0.05）;钙化组其细胞凋亡率较对照组明显升高,而不同浓度吡格列酮呈剂量依赖性地减轻钙化大鼠血管平滑肌细胞凋亡率（P<0.05）;钙化组GRP78、Caspase-12和Runx2　的mRNA及蛋白表达明显升高,而不同浓度吡格列酮呈剂量依赖性地下调钙化大鼠血管平滑肌细胞GRP78、Caspase-12和Runx2的mRNA及蛋白表达（P<0.05）。结论　吡咯列酮通过内质网应激致凋亡途径作用可减轻β-磷酸甘油诱导的血管平滑肌细胞钙化,其作用可能与GRP78、Caspase-12及Runx2表达下调有关。     

去除穿膜区序列的线粒体融合素2基因通过线粒体凋亡路径促进大鼠血管平滑肌细胞凋亡

目的 研究去除穿膜区序列的大鼠线粒体融合素2(tMfn2)基因对大鼠血管平滑肌细胞(VSMC)凋亡的影响及其相关的信号通路.方法 用携带tMfn2基因和线粒体融合素2(Mfn2)基因的重组腺病毒(Adv-tMfn2和Adv-Mfn2)感染VSMC.采用流式细胞术、细胞凋亡ELISA、TUNEL染色等方法检测tMfn2对VSMC凋亡的影响.Western blot分析磷酸化蛋白激酶B(p-Akt)以及线粒体凋亡路径中B细胞淋巴瘤/白血病-2蛋白(Bcl-2)、Bcl-2相关的X蛋白(Bax)、有活性的天冬氨酸特异-半胱氨酸蛋白酶9(cleaved caspase-9)的表达变化.结果 流式细胞仪检测和ELISA结果表明.tMfn2促VSMC凋亡的作用显著强于Mfn2,且呈时间依赖性[72 h凋亡率分别为(79.2±0.12)%和(65.0±1.2)%,P<0.01].TUNEL染色发现tMfn2组的凋亡细胞明显多于Mfn2组(P<0.01).Western blot结果显示,tMfn2和Mfn2组中p-Akt水平均明显降低,但前者作用更显著(P<0.01).进一步检测线粒体凋亡路径中的相关蛋白,tMfn2组的Bax蛋白表达显著升高、Bcl-2蛋白表达显著降低,且cleaved caspase-9的活性明显增强,较Mfn2诱导凋亡的作用更强(P<0.01).结论 与Mfn2相比,tMfn2促进VSMC凋亡的作用更强,其机制与抑制Akt磷酸化并激活线粒体凋亡途径有关.     

氯离子通道阻断剂对大鼠离体海马神经元凋亡的影响

目的 通过观察氯离子(Cl-)通道阻断剂对一氧化氮(NO)供体3-吗啉斯德酮胺(SIN-1)诱导的大鼠离体海马神经元凋亡的效应,探讨Cl-通道在缺血性脑损伤中的作用.方法 离体培养12 d的SD大鼠海马神经元,随机分为正常对照组、SIN-1处理组、SIN-1处理后和Cl-通道阻断剂组,对各组神经元分别在相应的时间点进行Hoechst荧光染色观察凋亡细胞数和MTT实验定量检测神经元的存活率.结果 SIN-1能明显诱导神经元凋亡(P<0.05),SITS和DIDS呈剂量依赖性地抑制NO诱导的神经元损伤,提高神经元的存活率,与SIN-1组相比差异显著(P<0.05).结论 Cl-通道阻断剂对NO诱导的大鼠海马神经元凋亡有一定的保护作用.     

N-乙酰半胱氨酸对烟雾暴露所致大鼠慢性阻塞性肺疾病模型的影响

血管内皮细胞牛长因子(VEGF)对于维持正常肺泡结构、抗损伤及组织修复、抗内皮细胞凋亡具有重要作用,父于抗氧化剂对COPD肺组织VEGF分泌及间隔细胞凋亡影响的研究鲜有报道.我们采用熏香烟法建立大鼠COPD模型,通过N-乙酰半胱氨酸(NAC)干预,观察其对大鼠肺功能、肺气肿程度和肺泡间隔细胞凋亡及VEGF分泌的影响,了解COPD发病机制中氧化和抗氧化失衡与凋亡之间的关系.     

同型半胱氨酸硫内酯对ECV-304细胞凋亡及ROS生成的影响

目的探讨同型半胱氨酸硫内酯(HcyT)对人脐静脉内皮细胞株(HUVEC)的损伤作用及其可能机制.方法采用倒置显微镜、四唑盐(MTT)比色法及碘化吡啶(PI)染色流式细胞仪检测HcyT对细胞毒性作用,以荧光标记流式细胞仪检测细胞内反应性氧类(ROS)的生成.结果一定剂量HcyT刺激后,内皮细胞发生凋亡,且凋亡呈浓度时间依赖性.随着HcyT浓度的增加,ROS的生成逐渐增加.结论HcyT通过ROS呈时间浓度依赖性地诱导内皮细胞凋亡,这可能是Hcy致血管病变的机制之一.     

Mitochondrial protection by low doses of insulin-like growth factor- Ⅰ in experimental cirrhosis

AIM： To characterize the mitochondrial dysfunction in experimental cirrhosis and to study whether insulin-like growth factor-Ⅰ （IGF-Ⅰ ） therapy （4 wk） is able to induce beneficial effects on damaged mitochondria leading to cellular protection.
METHODS： Wistar rats were divided into three groups： Control group, untreated cirrhotic rats and cirrhotic rats treated with IGF-Ⅰ treatment （2 μg/1O0 g bw/d）. Mitochondrial function was analyzed by flow cytometry in isolated hepatic mitochondria, caspase 3 activation was assessed by Western blot and apoptosis by TUNEL in the three expedmental groups.
RESULTS： Untreated cirrhotic rats showed a mitochondrial dysfunction characterized by a significant reduction of mitochondrial membrane potential （in status 4 and 3）; an increase of intramitochondrial reactive oxigen species （ROS） generation and a significant reduction of ATPase activity. IGF-Ⅰ therapy normalized mitochondrial function by increasing the membrane potential and ATPase activity and reducing the intramitochondrial free radical production. Activity of the electron transport complexes Ⅰ and Ⅲ was increased in both cirrhotic groups. In addition, untreated cirrhotic rats showed an increase of caspase 3 activation and apoptosis. IGF- Ⅰ therapy reduced the expression of the active peptide of caspase 3 and resulted in reduced apoptosis.
CONCLUSION： These results show that IGF- Ⅰ exerts a mitochondrial protection in experimental cirrhosis leading to reduced apoptosis and increased ATP production.     

The rat liver microcirculation in alcohol-induced hepatomegaly

It has been suggested that hepatocyte enlargement can lead to compression of the extracellular space (sinusoidal and interstitial) and induce portal hypertension. However, this hypothesis has never been tested by measuring the vascular and extravascular spaces in the intact liver. The aim of the present study was to investigate the effects of chronic alcohol intake on the hepatic microcirculation using Goresky's multiple-indicator dilution technique in the isolated perfused rat liver. Female rat littermates were pair-fed either ethanol (n = 7) or an isocaloric carbohydrate diet (n = 7) for 21 days. As expected, chronic alcohol intake produced a significant increase in liver/body weight ratio (+32%, p less than 0.01) and hepatocyte size (+45%, p less than 0.001), which was accompanied by a marked increase in the cellular water space (control: 3.3 +/- 0.6 ml; ethanol-fed: 4.9 +/- 0.9 ml; p less than 0.001). When expressing data per total liver, the sinusoidal space was similar in the two groups (control: 1.87 +/- 0.2; ethanol-fed: 1.95 +/- 0.2 ml; not significant), whereas the interstitial space was increased in alcohol rats compared to controls (albumin space +58%, p less than 0.01; sucrose space +51%, p less than 0.01). In alcoholic rats, the sinusoidal space was probably stretched, with an overall reduced transversal diameter, as suggested by the reduced values found when data were expressed per gm of liver weight. However, despite this finding and the enlargement of the liver and hepatocytes observed in alcoholic rats, similar values were obtained between the two groups for the portal perfusion pressure and thus the intrahepatic vascular resistance.(ABSTRACT TRUNCATED AT 250 WORDS)     

体外研究腺苷酸活化蛋白激酶对食管鳞癌EC9706细胞增殖及凋亡的影响

目的通过体外研究观察腺苷酸活化蛋白激酶(AMPK)的激活剂AICAR对人食管癌EC9706细胞的增殖及凋亡影响。方法 AICAR以不同浓度作用于人食管癌EC9706细胞,通过光学显微镜观察不同时间后EC9706细胞的生长状态,并用MTT方法检测其吸光度值及细胞存活率的变化,流式细胞术检测其细胞凋亡率情况。结果随着AICAR浓度的增加,细胞的死亡数目明显增加。MTT法检测结果表明,AICAR能够抑制EC9706细胞增殖,并呈现出良好的浓度依赖性。流式细胞术检测结果显示,不同浓度的AICAR干预24 h后早期凋亡率、晚期凋亡率及总凋亡率均高于对照组,但仅有总凋亡率有统计学意义(P0.01)。结论 AMPK可以抑制人食管癌EC9706细胞的生长增殖,并可诱导EC9706细胞凋亡。     

Impact of diabetes on cardiomyocyte apoptosis and connexin43 gap junction integrity: role of pharmacological modulation

The integrity of myocardial structures plays a crucial role in signal transductions and cardiac function. The aim of this study was to test the hypothesis that diabetes mellitus (DM) exerts adverse effects on the integrity of gap junctions (GJs) and induces cellular apoptosis in rat cardiomyocytes that can be abolished by simvastatin or losartan therapy. An experimental model of DM (induced by streptozocin 60 mg/kg body weight) in adult male rats (n = 24) was utilized to investigate the integrity of GJs containing connexin43 (Cx43) and the incidence of cellular apoptosis in the left ventricular myocardium. These rats were divided into 3 groups; group I (insulin therapy only), group II (insulin plus simvastatin 20 mg/kg/day), and group III (insulin plus losartan 20 mg/kg/day). Diabetic rats and 8 healthy rats (group IV) were sacrificed at 3 weeks following DM induction for immunofluorescence analysis. The experimental results demonstrated that the number of intact Cx43 GJs and the integrated area (mum(2)) constituted by clusters of Cx43 spots were significantly higher in groups II and IV than in group III, and in groups II-IV than in group I (all P values < 0.05). Additionally, the number of apoptotic bodies was remarkably higher in group I than in groups II-IV, and notably higher in groups II-III than in group IV (all P values < 0.05). Simvastatin is more effective than losartan at inhibiting the effects of DM on the integrity of myocardial ultrastructures. Both drugs effectively prevent cellular apoptosis in diabetic rat heart.     

Xanthine oxidase interaction with vascular endothelial growth factor in human endothelial cell angiogenesis

OBJECTIVES: Reduced capillary density occurs early in cardiovascular diseases. Oxidant stress is implicated in endothelial apoptosis. We investigated the effects of xanthine oxidase (XO) on endothelial survival signaling: protein kinase B/Akt, its cross-talk with p38 MAPK and apoptosis pathways, and its effect on vascular tube formation in vascular endothelial growth factor (VEGF)-simulated human umbilical vein cells. METHODS: We studied primary cultured human endothelial cells from the umbilical cord. Reactive oxygen species (ROS) production was detected by dihydroethidium staining, cell-signaling pathways by western blots, cell survival by western blots, and nuclear chromatin and angiogenesis response by MTT proliferation assay and three-dimensional Matrigel cultures. RESULTS: Exogenous XO increased cellular ROS production and caused superoxide-dependent inhibition of Akt phosphorylation and enhancement of p38 MAPK phosphorylation in a time-and dose-dependent manner. In contrast, application of the XO inhibitor oxypurinol or allopurinol inhibited VEGF-stimulated Akt phosphorylation, indicating that endogenous XO promotes VEGF-induced endothelial cell (EC) survival signaling. Exogenous XO induced activation of caspase-3 and reduced expression of the anti-apoptosis protein Bcl-2. Exogenous XO also reduced EC viability, proliferation, and vascular tube formation by p38 MAPK-dependent, phosphoinositide 3-kinase (PI3-K) reversible mechanisms; whereas VEGF promoted EC survival by PI3-K-dependent, p38 MAPK-independent effects. CONCLUSIONS: Exogenous XO activity is an important contributor to endothelial mechanisms for microvascular rarefaction, by modulation of cell survival signaling pathways; however, endogenous XO is necessary for maintaining EC survival.     

加贝酯预防急性胰腺炎的作用机制研究

目的通过观察加贝酯对胰腺细胞凋亡及Bax、Bcl-2蛋白表达的影响,探讨加贝酯预防大鼠胰管注射法诱导的急性胰腺炎(AP)的相关机制。方法16只SD大鼠随机分为假手术组(4只)、AP组和加贝酯治疗组(各6只)。以50mmHg(1mmHg=0.133kPa)的恒压向胰胆管内注入30%泛影葡胺诱导SD大鼠AP模型,制模前15～20min加贝酯(4mg.h-1.kg-1体重)静脉持续滴注60min进行预防。组织病理检查观察胰腺炎症程度,应用TUNEL染色、免疫组化检测胰腺细胞凋亡和Bcl-2、Bax蛋白表达。结果加贝酯治疗组的胰腺组织病理改变较AP组减轻(P<0.05)。治疗组凋亡指数(AI)、Bax和Bcl-2表达值分别为8.00±1.80,10.12±1.52和1.83±0.39,前两者较AP组显著增高,而Bcl-2蛋白无显著差别。治疗组AI、Bax表达与胰腺的炎症程度呈负相关。结论加贝酯静脉滴注对大鼠胰管注射法诱导的AP有一定的预防作用。其机制可能与促进细胞凋亡和Bax蛋白表达上调有关。     

Alcohol, but not lipopolysaccharide-induced liver apoptosis involves changes in intracellular compartmentalization of apoptotic regulators

BACKGROUND: While alcohol-induced augmentation of liver apoptosis has been demonstrated in humans and laboratory animals, the underlying mechanisms are not fully elucidated. This study addresses the question whether alcohol and bacterial lipopolysaccharide (LPS), a putative mediator of alcohol effects on the liver, induce augmentation of liver apoptosis by intrinsic or extrinsic signaling pathways. This information may prove important for future design of therapies for alcoholic liver disease. METHODS: Male rats were fed either an alcohol-containing liquid diet or an isocaloric, control diet for 15-16 weeks. At the end of feeding period, the rats were treated with LPS (0.8 mg.kg-1 body weight) or sterile saline and killed 3 and 24 hr later. The liver and blood were sampled for histology and biochemical assays. Hepatocytes were isolated by collagenase perfusion and fractionated to yield mitochondria and cytoplasm. The propensity of mitochondria to undergo permeability transition in the presence of a Ca2+ overload was determined along with distribution of various apoptotic regulators (AIF, Smac2, Bax, cytochrome c, Bcl-XL, Bfl-1, and caspase-2) between mitochondria and cytoplasmic fractions. RESULTS: Increased liver apoptosis in alcohol-treated rats was associated with translocation of several apoptotic regulators between mitochondria and cytoplasm in a manner suggesting that alcohol induces augmentation of apoptosis by recruiting intrinsic apoptotic signals. LPS treatment of rats counteracted alcohol-induced changes in intracellular compartmentalization of apoptotic regulators despite an increased rate of apoptosis. LPS may, therefore, recruit extrinsic apoptotic signals, such as proinflammatory cytokines. CONCLUSIONS: Hepatocytes are to be able to mount an apoptotic response to both intrinsic and extrinsic signals. Alcohol increases liver apoptosis predominantly through an intrinsic signaling pathway while LPS recruits extrinsic signaling pathways.     

Inhibition of hepatic stellate cell activation following Yinchenhao decoction administration to dimethylnitrosamine-treated rats

Aim: In an effort to investigate the mechanism by which Yinchenhao decoction (YCHD) acts on liver injury, we investigated the potential antifibrogenic effects of YCHD in an experimental liver fibrosis rat model, with special focus on the mechanisms inhibiting the activation and promoting apoptosis of hepatic stellate cells (HSC). Methods: The rats were initially randomized into two groups: the control (n = 10) and dimethylnitrosamine‐treated (DMN; n = 30) groups. DMN (10 mg/kg body weight) was administered intraperitoneally to the DMN‐treated rats for three consecutive days each week. At the end of the second week, three rats from the control and six rats from the DMN‐treated groups were killed for the fibrosis development assessment. The remaining DMN rats were further randomized into two groups: the DMN–water group (n = 12) and the DMN–YCHD group (n = 12). Both groups continued to receive weekly DMN treatment for another 2 weeks in addition to daily administration of either water or YCHD, which were given intragastrically at a dose of 0.418 g/100 g body weight. Results: Hepatic hydroxyproline content decreased and had improved histopathology in the DMN–YCHD rats. Compared to the DMN group, α‐smooth muscle actin (SMA) and CD68 expression in the DMN–YCHD group was reduced significantly; however, α‐SMA‐positive HSC apoptosis was not observed by confocal microscopy; Fibrogenic proteins (tissue inhibitor matrix proteinases‐1 and 2 and matrix metalloproteinase [MMP]‐2/14) and cytokines (tumor necrosis factor‐α and transforming growth factor‐β₁) were decreased; MMP‐9 was significantly upregulated. Conclusion: Yinchenhao administration attenuates liver fibrosis at least in part by inhibiting HSC activation directly, rather than promoting cell apoptosis of activated HSC, and the suppressive activation of Kupffer cells.     

干细胞移植对大鼠实验性结肠炎的研究

目的 探讨异体骨髓造血干细胞(HC)和间充质干细胞(MSC)移植对大鼠实验性结肠炎(EC)的作用.方法 体外分别传代培养雄性大鼠的MSC和HC备用.实验1组的HC悬液以5-溴-2-脱氧尿嘧啶(BrdU)标记;实验2组用贴壁法获得MSC.72只雌性大鼠用三硝基苯磺酸灌肠法建立EC模型,造模后24 h,实验1组和实验2组经尾静脉分别注入HC和MSC悬浮液(每组18只),两实验组的对照组(每组18只)注入0.9%氯化钠溶液.于移植后第7、14和21天取结肠组织行病理学检查.实验1组采用SP免疫组化法检测BrdU阳性细胞,实验2组用PCR检测Y染色体的性别决定区段(sry),以确定干细胞的定位情况.结果 EC造模成功.MSC和HC培养生长迅速,均一性好.移植第7、14、21天时,实验1组病变区BrdU阳性的HC检出率均为6/6.实验2组sry阳性的MSC检出率分别为1/6、2/6和3/6.而对照组均为阴性.但两移植组的病理组织学改善均不显著.结论 HC和MSC均可在大鼠EC模型的病变肠道中定植,但移植不显著改善组织病理学,MSC定植率比HC低.