CIP4在肾间质纤维化中的表达及作用

Objective To observe the expression and localization of CIP4 (Cdc42 interacting protein-4) in the renal fibrosis and the effect of CIP4 on the expression of E-cadherin,vimentin and β-catenin tyrosine phosphorylation. Methods In vitro, the human tubular epithelial cells (HK-2 cell line) were cultured with 10 μg / L TGF-β1 for 72 h. The protein expressions of CIP4, E-cadherin, vimentin and β-catenin tyrosine phosphorylation were measured by Western blotting; the expression of CIP4 mRNA was detected by RT-PCR. The intracellular distribution of CIP4 was observe by confocal microscope. In vivo, Masson staining was used to evaluate the level of renal fibrosis; the expression and distribution of CIP4 in renal tissue were detected by immunohistochemistry. HK-2 cells were transfected with pcDNA3. 1-CIP via lipofectamine 2000. The expressions of E-cadherin, vimentin and β-catenin tyrosine phosphorylation level in the transfected cells were detected by Western blotting. Results The expressions of CIP4 mRNA and protein were up-regulated in renal tubular EMT cells. Most of CIP4 protein localized in cell membrane, and some was in cytoplasm. After stimulation by TGF-β1, the expression of CIP4 protein both in cytoplasm and nucleus was greatly increased (P ＜0.05),especially in cytoplasm. In vivo, CIP4 was expressed in renal tubular epithelia, but little expressed in glomeruli. In renal from 5/6 nephrectomized rats, CIP4 expression was significantly increased. In the CIP4 transfectants, the expression of CIP4, vimentin and β-catenin tyrosine phosphorylation level were up-regulated (P ＜0.05), but E-cadherin expression was suppressed (P ＜0.05).Conclusion The overexpression of CIP4 is likely to take part in the epithelial-to-mesenchymal transition process, thereby promoting the renal fibrosis.     

CIP4在肾间质纤维化中的表达及作用

Objective To observe the expression and localization of CIP4 (Cdc42 interacting protein-4) in the renal fibrosis and the effect of CIP4 on the expression of E-cadherin,vimentin and β-catenin tyrosine phosphorylation. Methods In vitro, the human tubular epithelial cells (HK-2 cell line) were cultured with 10 μg / L TGF-β1 for 72 h. The protein expressions of CIP4, E-cadherin, vimentin and β-catenin tyrosine phosphorylation were measured by Western blotting; the expression of CIP4 mRNA was detected by RT-PCR. The intracellular distribution of CIP4 was observe by confocal microscope. In vivo, Masson staining was used to evaluate the level of renal fibrosis; the expression and distribution of CIP4 in renal tissue were detected by immunohistochemistry. HK-2 cells were transfected with pcDNA3. 1-CIP via lipofectamine 2000. The expressions of E-cadherin, vimentin and β-catenin tyrosine phosphorylation level in the transfected cells were detected by Western blotting. Results The expressions of CIP4 mRNA and protein were up-regulated in renal tubular EMT cells. Most of CIP4 protein localized in cell membrane, and some was in cytoplasm. After stimulation by TGF-β1, the expression of CIP4 protein both in cytoplasm and nucleus was greatly increased (P ＜0.05),especially in cytoplasm. In vivo, CIP4 was expressed in renal tubular epithelia, but little expressed in glomeruli. In renal from 5/6 nephrectomized rats, CIP4 expression was significantly increased. In the CIP4 transfectants, the expression of CIP4, vimentin and β-catenin tyrosine phosphorylation level were up-regulated (P ＜0.05), but E-cadherin expression was suppressed (P ＜0.05).Conclusion The overexpression of CIP4 is likely to take part in the epithelial-to-mesenchymal transition process, thereby promoting the renal fibrosis.     

Wnt/β-catenin通路及靶基因c-myc在肝细胞癌组织中的表达

目的 观察Wnt通路激活在肝细胞癌起源中的作用.方法 应用免疫组织化学方法检测31例肝细胞癌患者肿瘤组织(实验组)与癌旁正常组织(对照组)中Wnt2、β-catenin及其靶基因c-myc的表达.结果 在肿瘤组织与癌旁正常组织中,Wnt2蛋白的表达差异无统计学意义(P＞0.05);β-catenin的胞质表达在癌旁组织中明显增高(P＜0.05),而其胞核表达则在肿瘤组织中增高(P＜0.05);c-myc在肿瘤组织中表达增高,两组差异有统计学意义(P＜0.01).结论 β-catenin及其靶基因c-myc在肝细胞癌组织中表达增高,提示Wnt通路激活的过程在肝细胞癌的起源中起到重要作用.

Abstract：

Objective To explore the effect of Wnt signaling pathway activation in the origination of hepatocellular carcinoma. Methods Immunohistochemistry was used to observe the expression of Wnt2,β-catenin and target gene c-myc in hepatocellular carcinoma (experimental group) and peficancerous tissue (control group) from 31 patients. Results The expression of Wnt2 had no significantly difference in both groups (P ＞0. 05). The expression of β-catenin in cytoplasm was significantly higher in peficancerous tissue. However,the expression of β-catenin in nucleus was significantly higher in hepatocellular carcinoma ( P ＜ 0. 05). The expression of c-myc was also significantly higher in hepatocellular carcinoma (P ＜ 0. 01).Conclusion β-catenin and it' s target gene c-myc overexpressed in hepatocellular carcinoma. The activation of Wnt signaling pathway played an important role in the origination of hepatocellular carcinoma.     

神经生长因子基因修饰的骨髓间充质干细胞在糖尿病大鼠膀胱中的生长及表达

目的 将转入神经生长因子(NGF)的大鼠骨髓间充质干细胞(MSC)移植于糖尿病大鼠膀胱平滑肌组织内,观察MSC在膀胱组织内的存活和NGF基因的表达情况.方法 糖尿病组(30只)大鼠按链脲佐菌素(STZ)60 mg/kg行单次腹腔注射,对照组(15只)腹腔注射等体积的柠檬酸缓冲液.实验分组:对照组(正常大鼠膀胱)、发病组(糖尿病大鼠膀胱)、治疗组(糖尿病大鼠膀胱内移植转染NGF基因的MSC).溴苷法示踪NGF基因修饰的MSC在大鼠膀胱内的存活情况;RTPCR、ELISA法检测NGF基因在糖尿病大鼠膀胱内的表达情况.结果 单次腹腔注射STZ造模成功,8周后血糖仍处高位.NGF基因修饰的大鼠MSC移植入糖尿病大鼠膀胱内4周仍存活.ELISA检测结果显示对照组、发病组、治疗组大鼠膀胱NGF蛋白含量分别为(114±3)、(70±2)、(110±2)pg/ml,RT-PCR检测mRNA表达量分别为0.183±0.004、0.032±0.139、0.130±0.165.发病组与对照组相比NGF表达下降(P＜0.05),治疗组与发病组相比NGF表达上升(P＜0.05).结论转入NGF基因的大鼠MSC能在糖尿病大鼠膀胱中存活并稳定表达.

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Objective To confirm that rat bone marrow mesenchymal stem cells (MSC) transfected with nerve growth factor (NGF) gene in the bladder tissue of diabetic rats bladder tissues can survive and stably express NGF. Methods A diabetic rat model was constructed. The BrdU-labelled MSC transfected with NGF gene were transplanted into the diabetic rats bladder tissues. BrdUlabelled immunohistochemistry was used to observe the growth of MSC transfected with NGF gene in the diabetic rats bladder tissues. The expression of NGF mRNA and protein were checked by RT-PCR and ELISA. Results A diabetic rat model was successfully built by a single intraperitoneal injectionof STZ. The blood glucose was still high after 8 weeks. NGF gene modified MSC could be detected in the bladder of diabetic rats by BrdU-labelled immunohistochemistry. The concentration of NGF in the control group, disease group and treatment group were ( 114 ± 3), ( 70 ± 2), ( 110 ± 2) pg/ml by ELISA and mRNA quantity by RT-PCR were 0. 183±0. 004, 0. 032±0. 139, 0. 130±0. 165, respectively. Compared with the control group, the expression of NGF gene was decreased (P＜0. 05) in the incidence group. The expression of NGF gene was increased (P＜0. 05) in the treatment group compared with the disease group. Conclusions The NGF gene-modified MSC could survive in diabetic rats bladder tissues. The NGF gene in MSC could stably express in diabetic rats bladder tissues.     

靶向间皮角质细胞生长因子预防大鼠术后腹膜粘连的实验研究

目的 研究角质细胞生长因子(keratinocyte growth factor,KGF)通过促进间皮再生及影响腹膜纤溶活性而对大鼠腹膜粘连形成的预防作用.方法 30只雌性SD大鼠,平均分为3组,KGF组、阳性对照组和阴性对照组,每组10只.各组于术后第7天处死大鼠,参考Leach评分系统评估腹膜粘连程度,并采用免疫组化法来测定盲肠粘连组织中tPA、PAI-1表达情况.采用HE染色光镜观察组织变化情况,苦味酸天狼猩红染色-偏振光观察Ⅰ、Ⅲ型胶原蛋白表达.结果 KGF组胶原纤维变少,KGF组粘连总评分为(4.8±1.0)低于阳性对照组(7.6±1.0),两者差异有统计学意义(t=5.422,P＜0.01);KGF组Ⅰ型胶原纤维平均灰度值(69±11)明显高于阳性对照组(55±9)(t=3.214,P＜0.01);KGF组Ⅲ型胶原纤维平均灰度值(48±7)与阳性对照组(50±10)相比,差异无统计学意义(t=0.481,P＞0.05).免疫组化结果 示KGF组tPA表达水平(88±4.0)明显高于阳性对照组(112±4.0)和阴性对照组(101±2.0)(F=109.1,P＜0.01),PAI-1表达水平在3组之间的差异无统计学意义(F=1.391,P＞0.05).结论 KGF可促进腹膜间皮修复和增加间皮纤溶能力,抑制胶原沉积,从而降低术后粘连强度.

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Objective To investigate the effects of keratinocyte growth factor on peritoneal adhesion formation in rats. Methods Thirty Sprague-Dawley( SD) female rats were randomly assigned to 3 groups, KGF group( n = 10), positive control group (n = 10) , and negative control group (n = 10). Seven days after surgery, rats were killed and the adhesion degree was evaluated by Leach scale. Immunohistochemical technique was used to identify the expression of tPA and PAI-1. Stained with HE,the histomorphology changes of the adhesion tissue were observed by light microscope. Picrosirius-polarization method was used to observe the expression of type Ⅰ or Ⅲ collagens in two groups. Results In the KGF group,lower collagen fibers were noted and the gross adhesion scores was significantly lower than that in positive control group (4. 8 ± 1. 0 vs 7. 6 ± 1. 0; t = 5.422; P ＜ 0. 01). The expression level of type Ⅰ collagens was significantly lower in the KGF group than in positive control group (69 ±11 versus 55 ±9;t = 3. 214 ;P ＜0. 01) ,but there was no significant difference in the expression of type Ⅲ collagens among the two groups (48 ± 7 versus 50 ± 10; t = 0. 481; P ＞ 0. 05). The immunohistochemistry showed that the expression of tPA significantly increased in the KGF group than in positive control group and negative control group(88 ±4.0 versus 112 ±4.0, 101 ±2.0;F = 109. l,P＜0. 01) , However, no statistically significant difference for the expression of PAI-1 was noted among the three groups ( F = 1. 391, P ＞ 0. 05). Conclusions Keratinocyte growth factor promotes mesothelium repair, increases mesothelial fibrinolytic activity, inhibits the deposition of collagen and reduces the intensity of postoperative adhesions.     

RNA干扰Oct4的表达对肝癌细胞生物学行为的影响

目的 探讨干细胞相关基因Oct4与Wnt/β-catenin在人肝癌组织及肝癌细胞系中的相互作用.方法 PCR法检测Oct4、Wnt/β-catenin及其他相关基因在肝癌组织、癌旁组织及正常肝组织的表达差异.使用SiRNA-Oct4沉默人肝癌HepG2细胞Oct4的表达,实时荧光定量PCR法检测Wnt/β-catenin基因表达.检测RNAi后细胞迁移以及克隆形成能力.结果 肝癌患者的上述组织中,Oct4和β-catenin在癌内表达最高,癌旁次之,正常肝最低.使用SiRNA-Oct4沉默人肝癌HepG2细胞Oct4后,Oct4表达明显下调,β-catenin、Wnt10b表现为与Oct4表达呈正相关,TCF3表达与Oct4呈负相关.RNAi后HepG2细胞的迁移能力、克隆形成能力均下降.结论 Oct4在肝癌组织内高表达而在正常肝细胞中的表达极低.RNAi后HepG2细胞的迁移能力、克隆形成能力均下降可能与Wnt/β-catenin通路功能减弱有关.

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Objective To investigate the expression of Oct4 in liver cancer, and the interrelation of the Oct4 and Wnt/β-catenin genes in hepatocellular carcinoma( HCC) cell line HepG2. Methods RTPCR technique was used to detect the expression of Oct4 and β-Catenin in HCC specimens; RNAi was used to knock-down the expression of Oct4 in HepG2, and the change of Wnt/β-catenin related genes were detected by Real time-PCR. Results In HCC specimens, the expression of Oct4 and β-Catenin in tumor and cirrhotic liver tissues were stronger than normal liver tissues. In SiRNA Oct4 HepG2 cells, the expression of Oct4 was downregulated, and β-catenin as well as Wnt10b were in a positive correlation with Oct4, TCF3 was in negative correlation with Oct4. Clone formation and move ability of the HepG2 were downregulated. Conclusions The expression of Oct4 was higher in tumor tissues than in normal liver tissues. Silencing Oct4 by SiRNA-0ct4 in HepG2 resulted in decreased ability of clone formation and cell movement.     

大肠癌黏蛋白1和β-连环素联合表达的临床意义

目的 探讨大肠癌黏蛋白1(MUC1)与β-连环素(β-catenin)表达的临床意义.方法 应用免疫组织化学法检测90例大肠癌标本MUC1与β-catenin表达,分析两种分子标志的分布类型与大肠癌临床病理的关系;进一步检验MUC1表达与β-catenin分布的关系,评价联合表达对临床预后的判断价值.结果 54.44%出现MUC1极性分布的丧失,与肿瘤浸润深度相关(P＜0.05),而58.89%出现β-catenin核转移,与大肠癌TNM分期有关(P＜0.05).MUC1与核β-catenin的联合表达与大肠癌淋巴结转移和TNM分期相关(P＜0.01);联合表达阳性者生存率显著低于阴性者(P＜0.05).结论 MUC1极性分布的丧失与β-catenin核转移相关,两者联合表达的阳性提示较差的临床预后.

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Objective To investigate the clinical significance of combined expression of mucin 1(MUC1) and β-catenin in colorectal cancer. Methods Ninety colorectal cancer specimens were subjected to immunohistochemistry for detection of MUC1 and β-catenin. The relationships of expression patterns of these two biomarkers and clinicopathological parameters and survival were analyzed. Results Loss of polarity distribution of MUC1 was detected in 54. 44% cases and was related to depth of invasion ( P ＜0.05), and nuclear translocation of β-catenin was found in 58. 89% cases and correlated with TNM stage (P ＜0.05). The combined expression of MUC1 and nucrear β-catenin was related to lymph node metastasis and TNM stage (P ＜ 0.01 ) and also, a significantly lower survival rate (P ＜0.05 ). Conclusion Combined expression of MUC1 and nuclear β-catenin indicated a worse prognosis in colorectal cancer.     

荷负电气溶胶治疗对大鼠烫伤创面白细胞介素-8、10表达的影响及意义

目的 观察荷负电气溶胶治疗对大鼠烫伤创面愈合过程中白细胞介素(IL)-8、IL-10表达的影响,探讨荷负电气溶胶治疗促进创面愈合的作用机制.方法 制作SD大鼠深Ⅱ度烫伤模型,采用分组对照方法,将40只鼠随机分为治疗组(n1=20)和对照组(n2=20).治疗组应用荷负电气溶胶治疗,每次1.5 h,每天2次,直至创面愈合;对照组不作荷负电气溶胶治疗.伤后第1～11天分别取创面标本制作切片,采用免疫组织化学和图像分析方法,检测创面愈合过程中IL-8和IL-10表达水平.结果 创面平均愈合时间治疗组为(7.00±1.15)d,对照组为(9.00±1.34)d,治疗组创面愈合时间明显提前(P＜0.01).免疫组织化学显示,两组IL-8均在伤后第1天开始表达.主要位于多核粒细胞和单核细胞;第3天表达明显增多达高峰,并见大量成纤维细胞表达,治疗组的峰值明显低于对照组,差异有统计学意义(P＜0.01),第5～11天表达水平迅速下降.两组IL-10伤后第1天在淋巴细胞和单核细胞均有表达;第3天开始有角质细胞表达并达高峰,第5～11天表达水平缓慢下降,但治疗组要明显高于对照组,第3～11天差异有统计学意义(P＜0.01).结论 荷负电气溶胶治疗能有效抑制创面IL-8的表达及促进IL-10的表达,缩短炎症进程,从而加速创面愈合.

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Objective To discuss the influence of aerosol bioelectricity on the expression of interleukin (IL) -8 and IL-10 in wound healing of burned rats. Methods The deep Ⅱ degree scalding models were established in Sprague Dawley (SD) rats. Rats were randomly divided into experimental group (n1 =20) and control group (n2 =20). The rats in experimental group were treated with aerosol bioelectricity.Samples were collected at the first to eleventh day post-scalding. Immunohistochemistry and image analysis methods were conducted to examine the expression of IL-8 and IL-10 in both experimental and control groups. Results The average wound healing time in experimental group was 7. 00 ± 1. 15 days, and that in control group was 9. 00 ± 1. 34 days. IL-8 and IL-10 were observed mainly in polylmorphonuclear and mononuclear cells in both experimental and control groups on the 1 st day. On the third day, fibroblasts abounded, IL-8 expression was increased evidently and reached a peak. The peak value (6. 73 ± 1. 36) in experimental group was lower significantly than that in control group ( 2. 85 ± 0. 72, P ＜ 0. 01). From the 5th to 11th day, IL-8 expression was declined rapidly. IL-10 was expressed in keratode cells and had the peak value in experimental group (1. 24 ±0. 15) and control group (5. 69 ± 1. 32) on the 3rd day. IL-10 expression was declined gradually from the 5th to 11th days. The expression level of IL-10 in experimental group was significantly higher than in control group from the 3rd day to 11th days post-scalding (P＜0. 01). On the 3rd day, both IL-8 and IL-10 in experimental and control groups were expressed abundantly , and there was negative relationship between them (r = - 0. 862, P ＜ 0. 01). Conclusion Aerosol bioelectricity can indicate active cells proliferation through down-regulating the expression of IL-8 and up-regulating the expression of IL-10, accelerating burned wound healing.     

大鼠肝移植急性排斥反应中肿瘤坏死因子受体配体的表达及其意义

目的 观察肝移植排斥反应中移植肝脏内糖皮质激素诱导的肿瘤坏死因子受体配体(GITRL)的表达.方法 采用Kamada's二袖套法建立从Lewis到Brown Norway(BN)大鼠的肝移植排斥模型为排斥组(n=5),从BN到BN的肝移植模型为耐受组(n=5).术后24h,抽取血液,取肝脏及分离库普弗(Kupffer)细胞,检测肝脏上GITRL及肿瘤坏死因子(TNF)-α的表达,Kupffer细胞上GITRL的表达,检测血清及细胞上清液中TNF-α的表达.免疫组织化学染色强度采用Image-Pro Plus 6.0图像分析软件分析.结果 免疫耐受组和排斥组肝脏内的CITRL的平均染色强度分别为0.113±0.007和0.270±0.018(P＜0.05),TNF-α平均染色强度分别为0.114±0.004和0.141±0.005(P＜0.05),耐受组和排斥组的Kupffer细胞GITRL平均染色强度分别为0.206±0.017和0.337±0.018(P＜0.05),Kupffer细胞的培养上清液中,耐受组和排斥组TNF-α的值分别为(68.66±21.12)、(178.33±29.39)ng/L(P＜0.05).结论 在排斥的早期阶段肝脏及Kupffer细胞的GITRL表达增高,监测和干扰GITRL可能有益于肝移植急性排斥反应的早期诊断和处理.

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Objective To investigate te changes of glucocorticoid induced tumor necrosis factor receptor ligand (GITRL) in hepatic allograft rejection. Methods Liver transplantation from Lewis rats (n = 5 ) to Brown Norway (BN) rats was performed by Kamada' s two-cuff technique as acute rejection group. Liver transplantation from BN to BN rats ( n = 5 ) was performed as tolerance group. Recipients were sacrificed at 24th h postoperation. Blood samples were collected and grafts were harvested, then Kupffer cells were isolated. GITRL and tumor necrosis factor (TNF)-α protein expression in the hver was tested by immunohistochemistry, and the GITRL expression in Kupffer cells by immunocytochemistry. Enzyme linked immunosorbent assay (ELISA) was employed to detect the changes of TNF-α protein in the serum and supernatant. The staining intensity was analyzed by Image-Pro Plus 6. 0 image analysis software. Results At 24th h postoperation, the liver GITRL expression levels in tolerance and rejection groups were 0. 113 ± 0. 007 and 0. 270 ±0. 018, respectively (P ＜0. 05). The TNF-α expression levels in the liver in tolerance and rejection groups were 0. 114 ± 0. 004 and 0. 141 ± 0. 005 respectively ( P ＜ 0.05 ). The GITRL expression levels in Kupffer cells in tolerance and rejection groups were 0. 206 ±0. 017 and 0. 337 ±0. 018 respectively (P ＜0. 05 ). As compared with tolerance group (68. 66 ±21.12) ng/L, TNF-α protein expression levels were up-regulated in the supernatant of rejection group ( 178.33 ± 29. 39 ) ng/L ( P ＜ 0. 05 ).Conclusion The expression of GITRL in the liver and Kupffer cells was increased in the early stage of rejection, and monitoring and interfering GITRL may be useful for the early diagnosis and management of an acute rejection in liver transplantation.     

金属硫蛋白对皮瓣存活及细胞凋亡基因的影响

目的 观察金属硫蛋白(MT)对细胞凋亡基因及皮瓣存活影响.方法 大鼠背部形成随意皮瓣,实验组予以MT,对照组予以生理盐水,术后10 d测皮瓣存活率,术后3 d行苏木素-伊红(HE)染色光镜检查,激光多普勒测血运,术后3 d测皮瓣细胞凋亡基因bcl-2、bax蛋白.结果 MT组皮瓣的存活率(69.88±3.12)%高于对照组(60.65±2.98)%(P＜0.01).MT组中性粒细胞较多,激光多普勒血流量相对值(LDF值)下降少(P＜0.01).bcl-2蛋白表达MT组(2.98±0.23)较对照组(1.24±0.11)高(P＜0.01).bax蛋白(0.09±0.02)较对照组(0.23±0.09)低(P＜0.01).结论 皮瓣术后MT促进bcl-2,抑制bax,从而提高皮瓣存活率.

Abstract：

Objective To investigate whether metallothionein (MT) influences necrosis and expression of bcl-2 and bax in random pattern skin flaps of rats. Methods After flap operation, the rats in MT group were injected with MT, and those in control group received an injection of drug-free saline. Survival rate of the flaps was measured and the changes in the tissue were observed under the light microscopy.By using Doppler, the blood flow of flap was measured. The expression of bcl-2 and bax was detected. Results The survival area in MT group (69. 88 ±3. 12)% was significantly greater (P＜0.01) than that in control group (60. 65 ± 2. 98) %. There were more inflammatory cells in control group than in MT group.LDF in MT group was significiently higher than that in control group (P ＜0.01 ) 1st h, 2nd h, 3rd h, 6th h,1 st day, 3rd day, 6th and 7th day postoperation and at the 10th day postoperation (P ＜ 0. 05 ). At the 3rd day postoperation, the expression of bcl-2 in MT group (2.98 ± 0. 23 ) was significantly higher than that in control group ( 1.24 ± 0. 11 ) ( P ＜ 0. 01 ). The expression of bax in MT group ( 0. 09 ± 0. 02 ) was significantly lower than that in control group (0. 23 ± 0. 09) ( P ＜ 0. 01 ). Conclusion MT can affect the expression of bcl-2 and bax and significantly promote survival of skin flap.     

上皮钙黏素1基因启动子甲基化对结肠癌上皮钙黏素和β-连接素表达的影响

目的 探讨上皮钙黏素基因(CDH1)启动子甲基化与结肠癌上皮钙黏素(E-cadherin)及β-连接素(β-catenin)的表达及临床病理特征的关系.方法 采用甲基化特异性PCR技术检测68例结肠腺癌组织、癌旁组织及正常黏膜组织中CDH1基因启动子甲基化的状况.采用免疫组织化学法检测E-cadherin及β-catenin蛋白的表达.结果 癌旁组织及癌组织中CDH1启动子甲基化的阳性表达分别为32.4%(22/68)、57.4%(39/68),正常组织均为阴性表达(P<0.05).E-cadherin在正常组织、癌旁组织及腺癌组织中阳性表达率分别为92.6%、66.2%和44.1%.正常组织中β-catenin均表达于细胞膜上,无胞质和(或)胞核表达,而β-catenin在癌旁组织及癌组织中胞质和(或)胞核表达分别为29.4%和50.0%.CDH1基因启动子甲基化阳性率与E-cadherin表达则呈负相关(r=-0.312,P=0.01),与β-catenin胞质和(或)胞核表达呈正相关(r=0.309,P=0.018).CDH1基因启动子甲基化及E-cadherin、β-catenin的异常表达均与结肠癌分化程度及转移密切相关(P<0.05).结论 CDH1基因启动子甲基化可能是导致结肠癌E-cadherin与β-catenin异常表达及肿瘤侵袭性增强的重要原因.

Abstract：

Objective To investigate the relationship between methylation of the CDH1 gene promoter on the expression of E-cadherin and β-catenin, and to evaluate the correlation with clinicopathological characteristics of the colonic carcinoma. Methods Methylation specific PCR (MSP) was used to detect CDH1 gene promoter methylation in the cancer tissue, adjacent tissues and normal tissues in 68 patients. The expression of E-cadherin and β-catenin was determined by immunohistochemistry staining. Results The positive rate of CDH1 gene promoter methylation was 32.4% in adjacent tissues and 57.4% in cancer tissue, while no detectable methylation was found in all the normal tissues. The difference was statistically significant. The positive rate of E-cadherin was 92.6% in the normal tissues, 66.2% in the adjacent tissues and 44.1% in the cancer tissues. In all normal tissues, β-catenin was expressed only at the cellular membrane but not in the cytosol or nucleus, while the expression of β-catenin was present in the cytosol or nucleus in 29.4% of the adjacent tissues and 50.0% of the cancer tissues. The positive rate of CDH1 gene promoter methylation was negatively correlated with E-cadherin expression (r =-0.312,P =0.01) and positively correlated with β-catenin cytosolic/nucleus expression(r=0.309,P=0.018). The differentiation and metastasis of colonic carcinoma were associated with the aberrant expression of E-cadherin, β-catenin, and methylation of CDH1 promoter (P<0.05). Conclusion CDH1 gene promoter methylation may lead to aberrant expression of E-cadherin and β-catenin in colonic carcinoma, and may play an important role in promoting the invasion of tumor.     

Claudin-1和Claudin-2在大鼠急性结肠炎黏膜中的表达

目的 观察紧密连接蛋白Claudin-1和Claudin-2在急性结肠炎大鼠模型结肠黏膜中的表达.方法 对16只SD大鼠采用三硝基苯磺酸灌肠建立急性结肠炎模型,各取8只分别于1周和2周后观察结肠组织的病理学变化,另取5只正常大鼠作对照.应用量子点免疫标记技术检测两种蛋白在正常大鼠、结肠炎1、2周大鼠结肠黏膜中的表达及分布,测定蛋白表达的荧光强度.结果 与正常组比较,急性结肠炎1周时大鼠的Claudin-1和Claudin-2表达均明显增强(荧光强度分别为66.01±25.14比48.12±13.25,70.35±24.36比40.12±9.56,P均<0.01)且分布更广,2周时表达水平较1周时回落(P<0.05),其中Claudin-1下降较为明显,Claudin-2仍维持一个较高水平[分别为54.64±14.26和60.87±14.27,与正常组比较,差异均有统计学意义(P<0.05,P<0.01)].Claudin-1和Claudin-2表达的变化与结肠炎病理学观察的结果 基本一致.结论 急性结肠炎导致肠黏膜的Claudin-1和Claudin-2表达增强,尤以Claudin-2增加明显,两者的变化与急性结肠炎的病理改变密切相关.

Abstract：

Objective To study the expression of Claudin-1 and Claudin-2 in colonic epithelium of trinitrobenzene sulfonic acid (TNBS)-induced acute colitis models in rats.Methods Sixteen TNBS-induced colitis models in rats were established, and pathologic changes of colonic epithelium were analyzed after one or two weeks respectively. Fluorescence of quantum dots-labelled Claudin-1 and Claudin-2 expression was detected in colonic epithelial cells of normal, one-week colitis, and two-week colitis rats. Fluorescence intensity and distribubition of fluorescence signals were recorded and analyzed.Results As compared with that in normal rats (n=5), both Claudin-1 and Claudin-2 expression was increased in one-week colitis rats (relative fluorescence intensity: 66.01±25.14 vs. 48.12±13.25, 70.35±24.36 vs 40.12±9.56, both P<0.01) with wider distribution in crypt. In two-week colitis rats, Claudin-1 and Claudin-2 expression levels were dropped, but Claudin-2 expression was decreased less than Claudin-1, and both remained at a higher level than normal rats (54.64±14.26 and 60.87±14.27, respectively, P<0.05 and P<0.01, respectively vs normal). The changes of expression of Claudin-1 and Claudin-2 were in accordance with the results of pathologic scoring for colitis.Conclusion Along with the pathologic changes in colonic epithelium, Claudin-1 and Claudin-2 expression levels are increased in acute colitis rats, and Claudin-2 expression seems more significant than Claudin-1 as an indicator for colitis.     

脾动脉缩窄对门静脉高压大鼠脾脏iNOS表达及Th1/Th2平衡的影响

Objective To investigate the effect and the potential mechanism of splenic artery coarctation on the expression of iNOS and Th1/Th2 cytokines in spleen of cirrhotic rats with portal hypertension (PHT). Methods Cirrhotic rats were randomized into 3 groups (n= 10):sham operation group (SOG), splenic artery coarctation group (SAC) and splenic artery ligation group (SAL). Ten normal rats treated with sham operation were employed to serve as normal control group (NCG). Immunohistochemial staining was used to observe iNOS. RT-PCR was used to detect IFN-γ and IL-4mRNA. The Pearson's correlation analysis was used to investigate the relationship between iNOS and IFN-γ or IL-4. Results The expression of iNOS was increased significantly in spleen of cirrhotic rats as compared with NCG(P＜0. 01). It was decreased after SAC and SAL compared with SOG (P＜0. 01). The expression of IFN-γmRNA and IFN-γ/IL-4 of SOG were decreased but IL-4mRNA increased significantly than that of NCG(P＜0.01). IFN-γmRNA was increased after SAC compared with SOG (P＜0.05). IL-4mRNA was decreased and IFN-γ/IL-4 increased after SAC and SAL compared with SOG (P＜0. 05). The expression of iNOS was negatively correlated with the expression of IFN-γmRNA(r=-0.672, P＜ 0.01 ) and positively correlated with the expression of IL-4 mRNA (r=0.634,P＜0. 01). Conclusion The expression of iNOS is decreased and IFN-γ/IL-4 increased after SAC in spleen of cirrhotic rats with PHT and it may improve Th1/Th2 polarization by reducing the expression of iNOS.     

脾动脉缩窄对门静脉高压大鼠脾脏iNOS表达及Th1/Th2平衡的影响

Objective To investigate the effect and the potential mechanism of splenic artery coarctation on the expression of iNOS and Th1/Th2 cytokines in spleen of cirrhotic rats with portal hypertension (PHT). Methods Cirrhotic rats were randomized into 3 groups (n= 10):sham operation group (SOG), splenic artery coarctation group (SAC) and splenic artery ligation group (SAL). Ten normal rats treated with sham operation were employed to serve as normal control group (NCG). Immunohistochemial staining was used to observe iNOS. RT-PCR was used to detect IFN-γ and IL-4mRNA. The Pearson's correlation analysis was used to investigate the relationship between iNOS and IFN-γ or IL-4. Results The expression of iNOS was increased significantly in spleen of cirrhotic rats as compared with NCG(P＜0. 01). It was decreased after SAC and SAL compared with SOG (P＜0. 01). The expression of IFN-γmRNA and IFN-γ/IL-4 of SOG were decreased but IL-4mRNA increased significantly than that of NCG(P＜0.01). IFN-γmRNA was increased after SAC compared with SOG (P＜0.05). IL-4mRNA was decreased and IFN-γ/IL-4 increased after SAC and SAL compared with SOG (P＜0. 05). The expression of iNOS was negatively correlated with the expression of IFN-γmRNA(r=-0.672, P＜ 0.01 ) and positively correlated with the expression of IL-4 mRNA (r=0.634,P＜0. 01). Conclusion The expression of iNOS is decreased and IFN-γ/IL-4 increased after SAC in spleen of cirrhotic rats with PHT and it may improve Th1/Th2 polarization by reducing the expression of iNOS.