La核糖核蛋白6对人血管内皮细胞增殖与凋亡的作用

Objective To investigate regulatory effect of Acheron (Achn) on proliferation and apoptosis of human vascular endothelial cell. Methods ( 1 ) Eahy926 cells were cultured in serum-free DMEM medium (96-well plates) and were divided into Achn inhibition group (transfected with plasmid psi-Achn), psi4.1 group (transfected with psi4. 1 empty vector), Achn induction group (transfected with pcDNA-Achn), pcDNA3.1 group (transfected with pcDNA3.1 empty vector), cotransfection group [cotransfected with pcDNA-Achn + psi-calcium/calmodulin-dependent serine protein kinase (CASK)] , blank control group (treated with PBS) according to the random number table (the same method below). The cell proliferation was determined by MTT assay at post transfection hour (PTH) 1, 24, 48, 72, with expression of absorbance value. (2) Total protein of Eahy926 cells were extracted and quantitated by BCA assay, and then they were divided into Achn antibody precipitation group (100 μg protein) , CASK antibody precipitation group ( 100 μg protein), IgG antibody group ( 100 μg protein), Western blot group (20 μg protein).Achn and CASK protein levels were determined by immunoprecipitation and Western blot. (3) Synchronously cultured Eahy926 cells were divided into LPS induction group (treated with 5 mol/L LPS), Achn transfection group (transfected with pcDNA-Achn), cotransfection group (cotransfected with psi-CASK and pcDNA-Achn) , KCl group (treated with 5 mol/L KCl), and blank control group (treated with 5 mol/LPBS). Cells in transfection groups were stimulated by LPS for 12 hours after PTH 24. Caspase-3 protein level was detected by immunohistochemistry. (4) Synchronously cultured Eahy926 cells were divided into Achn inhibition group (transfected with psi-Achn vector), Achn induction group ( transfected with pcDNA-Achn vector), and blank control group ( treated with PBS). Apoptosis rate was determined by FITC/PI with flow cytometry. Data were processed with one-way analysis of variance and t test. Results ( 1 ) The cell proliferation in Achn inhibition group was lower than that in psi4.1 group from PTH 24, and the differences were statistically significant at PTH 48, 72 (with t value respectively 10. 777, 6.112, P values all below 0. 05 ).The cell proliferation in Achn induction group during PTH 24-72 were higher that in pcDNA3. 1 group (with t value respectively 5. 367, 6. 053, 9. 831, P values all below 0.05 ). The cell proliferation in cotransfection group at PTH 48, 72 were significantly lower than that in Achn induction group ( with t value respectively 5.481, 9. 517, P values all below 0. 05). (2) Achn protein was detected in CASK antibody precipitation group while CASK protein was also detected in Achn antibody precipitation group. (3) Caspase-3 level in Achn transfection group was lower [( 15.6 ± 0. 5 ) %] as compared with that in LPS induction group [(32. 8 ±2.6)%, t = 10. 083, P ＜ 0. 05], and that in cotransfection group showed further inhibition [(7.0 ±2.0)%,t =9.827, P ＜0.01]. (4) Apoptosis rate in Achn inhibition group[(45.6 ± 10.9)%] was higher than that in blank control group [(13.2±4.3) %, t =7.043, P ＜0.05]; while that in Achn inductiongroup [(5.3 ±2.9)%] was lower than that in blank control group ( t =6.499, P ＜0.05).Conclusions Achn can promote human vascular endothelial cell proliferation, and inhibit its apoptosis induced by LPS or burn serum, and the effect is related to CASK.     

La核糖核蛋白6对人血管内皮细胞增殖与凋亡的作用

Objective To investigate regulatory effect of Acheron (Achn) on proliferation and apoptosis of human vascular endothelial cell. Methods ( 1 ) Eahy926 cells were cultured in serum-free DMEM medium (96-well plates) and were divided into Achn inhibition group (transfected with plasmid psi-Achn), psi4.1 group (transfected with psi4. 1 empty vector), Achn induction group (transfected with pcDNA-Achn), pcDNA3.1 group (transfected with pcDNA3.1 empty vector), cotransfection group [cotransfected with pcDNA-Achn + psi-calcium/calmodulin-dependent serine protein kinase (CASK)] , blank control group (treated with PBS) according to the random number table (the same method below). The cell proliferation was determined by MTT assay at post transfection hour (PTH) 1, 24, 48, 72, with expression of absorbance value. (2) Total protein of Eahy926 cells were extracted and quantitated by BCA assay, and then they were divided into Achn antibody precipitation group (100 μg protein) , CASK antibody precipitation group ( 100 μg protein), IgG antibody group ( 100 μg protein), Western blot group (20 μg protein).Achn and CASK protein levels were determined by immunoprecipitation and Western blot. (3) Synchronously cultured Eahy926 cells were divided into LPS induction group (treated with 5 mol/L LPS), Achn transfection group (transfected with pcDNA-Achn), cotransfection group (cotransfected with psi-CASK and pcDNA-Achn) , KCl group (treated with 5 mol/L KCl), and blank control group (treated with 5 mol/LPBS). Cells in transfection groups were stimulated by LPS for 12 hours after PTH 24. Caspase-3 protein level was detected by immunohistochemistry. (4) Synchronously cultured Eahy926 cells were divided into Achn inhibition group (transfected with psi-Achn vector), Achn induction group ( transfected with pcDNA-Achn vector), and blank control group ( treated with PBS). Apoptosis rate was determined by FITC/PI with flow cytometry. Data were processed with one-way analysis of variance and t test. Results ( 1 ) The cell proliferation in Achn inhibition group was lower than that in psi4.1 group from PTH 24, and the differences were statistically significant at PTH 48, 72 (with t value respectively 10. 777, 6.112, P values all below 0. 05 ).The cell proliferation in Achn induction group during PTH 24-72 were higher that in pcDNA3. 1 group (with t value respectively 5. 367, 6. 053, 9. 831, P values all below 0.05 ). The cell proliferation in cotransfection group at PTH 48, 72 were significantly lower than that in Achn induction group ( with t value respectively 5.481, 9. 517, P values all below 0. 05). (2) Achn protein was detected in CASK antibody precipitation group while CASK protein was also detected in Achn antibody precipitation group. (3) Caspase-3 level in Achn transfection group was lower [( 15.6 ± 0. 5 ) %] as compared with that in LPS induction group [(32. 8 ±2.6)%, t = 10. 083, P ＜ 0. 05], and that in cotransfection group showed further inhibition [(7.0 ±2.0)%,t =9.827, P ＜0.01]. (4) Apoptosis rate in Achn inhibition group[(45.6 ± 10.9)%] was higher than that in blank control group [(13.2±4.3) %, t =7.043, P ＜0.05]; while that in Achn inductiongroup [(5.3 ±2.9)%] was lower than that in blank control group ( t =6.499, P ＜0.05).Conclusions Achn can promote human vascular endothelial cell proliferation, and inhibit its apoptosis induced by LPS or burn serum, and the effect is related to CASK.     

γ干扰素与肿瘤坏死因子α对肠上皮屏障功能影响的实验研究

Objective To investigate the effect of combination of interferon-gamma (IFN-γ) and tumor necrosis factor-alpha ( TNF-α ) on intestinal epithelial barrier function. Methods The Caco-2 monolayers were cultured in DMEM nutrient solution, and then they were inoculated in 24-well or 6-well plate with Transwell inserts. They were divided into control group ( ordinary treatment), IFN-γ group ( with addition of 10 ng/mL IFN-γ), TNF-α group (with addition of 10 ng/mL TNF-α), and IFN-γ plus TNF-α group (with addition of 10 ng/mL TNF-α and 10 ng/mL IFN-γ ). Monolayers inoculated in 24-well plate were collected for determination of transepithelial electrical resistance (TER) with an ohmmeter at post treatment hour (PTH) 0, 6, 12, 24, 36, and 48, the permeability of monolayers with fluorescein isothiocyahate-labeled dextran (FITC-dextran) tracer method at PTH 48, the distribution and morphological change of tight junction occludin with immunofluorescence assay at PTH 48. Monolayers inoculated in 6-well plate were collected for determination of protein expression of occludin, myosin light chain kinase (MLCK), and phosphorylated MLC (pMLC) with Western blot at PTH 24. Data were processed with one-way analysis of vaiiance and t test. Results ( 1 ) There was no obvious difference in TER in control group at each time point ( F = 0. 86, P ＞ 0.05 ). TER in IFN-γgroup and TNF-α group were gradually decreased during PTH 6-48,but showed no statistical difference as compared with that at PTH 0 ( with F value respectively 1.69, 2.47,P values all above 0.05 ). TER in IFN-γplus TNF-α group was significantly decreased from PTH 24 as compared with that at PTH0 ( t =4.97, P ＜0.05) and that in each of the other three groups ( F =11.54,P ＜ 0.05 ). (2) The permeability of monolayers in IFN-γplus TNF-α group [( 1197 ± 215 ) pmol] was significantly higher than that in control group, IFN-γ group, and TNF-α group [( 303 ± 93 ), ( 328 ± 76),(797 ± 177) pmol, with t value respectively 4.8, 5.0, 6.9, P values all below 0.01]. (3) There was no statistical difference in occludin expression at PTH 24 among four groups ( F = 0.26, P ＞ 0.05). The occludin in control group at PTH 48 was regular in arrangement, while that in IFN-γand TNF-α groups was irregular in arrangement. The arrangement of occludin in IFN-γ plus TNF-c group at PTH 48 was interrupted,with obvious redistribution in cytoplasm. (4) The protein expression of pMLC in IFN-γ plus TNF-α group (0.95 ±0.05) was significantly higher than that in control group, IFN-γ group, or TNF-α group (0.57 ±0.12, 0.56 ±0.07, 0.59 ±0. 10, respectively, F = 17.97, P ＜0.01). The protein expression of MLCK in IFN-γplus TNF-α group (1.57 ±0.36) was also significantly higher than that in control, IFN-γ, TNF-α groups (0.85 ± 0.18, 1.04 ± 0. 23, 1.00 ± 0.07, respectively, F = 9.05, P ＜ 0.05 ). Conclusions Combination of IFN-γand TNF-α can induce intestinal epithelial barrier dysfunction by up-regulating MLCK protein expression and promoting MLC phosphorylation.     

Effect of Radix Paeoniae Rubra on the expression of HO-1 and iNOS in rats with endotoxin-induced acute lung injury

Objective: To investigate the effect of Radix Paeoniae Rubra (RPR) on the expression of heme oxygenase (HO-1) and induced nitric oxide synthase (iNOS) in endotoxin-induced acute lung injury in rats and its protective mechanism. Methods: Forty Wistar rats were divided randomly into 5 groups with 8 rats in each group: saline control group (NS group), lipopolysaccharide group ( LPS group), RPR-treatment group, RPR-prevention group and Hemin group. The effect of RPR on protein content, the ratio of neutrophiles in bronchoalveolar lavage fluid, malondialdehyde ( MDA ) content in the lung and the activity of serum NO were observed. Arterial blood was drawn for blood-gas analysis. The expression of HO-1 and iNOS in lung tissues was detected by immunohistochemitry and morphometry computer image analysis. The histological changes of the lung were observed under light microscope. Results: Compared with that in NS group, the expression of HO-1 and iNOS was markedly increased in LPS group (P<0.01). In RPR-treatment, RPR-prevention , and Hemin groups, the expression of iNOS was significantly lower, while the expression of HO-1 was higher than that in LPS group (P<0.05). The protein content, the ratio of neutrophiles in bronchoalveolar lavage fluid, the content of MDA and the activity of serum NO in LPS group were significantly higher than those in NS group (P<0.01). There was a significant decrease in the level of arterial bicarbonate and partial pressure of oxygen in the LPS group (P<0.01); these parameters of lung injury however, were significantly lower in RPR-treatment. RPR-prevention, and Hemin groups than LPS group (P<0. 05 or P< 0.01). The pathologic changes of lung tissues were substantially attenuated in RPR-treatment, RPR-prevention, and Hemin groups than LPS group. Conclusions: The high expression of HO-1 reflects an important protective function of the body during lipopolysaccharide-induced acute lung injury. The protective effect of RPR on lipopolysaccharide-induced acute lung injury is related to the inhibition of iNOS expression and the induction of HO-1 expression.     

Effect of Radix Paeoniae Rubra on the expression of HO-1 and iHOS in rats with endotoxin-induced acute lung injury

Objective ： To investigate the effect of Radix Paeoniae Rubra （RPR） on the expression of heme oxygenase （ HO- 1 ） and induced nitric oxide synthase （ iNOS ） in endotoxin- induced acute lung injury in rats and its protective mechanism. Methods： Forty Wistar rats were divided randomly into 5 groups with 8 rats in each group： saline control group （NS group ）, lipopolysaccharide group （LPS group）, RPR-treatment group, RPR-prevention group and Hemin group. The effect of RPR on protein content, the ratio of neutrophiles in bronchoalveolar lavage fluid, malondialdehyde （MDA） content in the lung and the activity of serum NO were observed. Arterial blood was drawn for blood-gas analysis. The expression of HO-1 and iNOS in lung tissues was detected by immunohistochemitry and morphometry computer image analysis. The histological changes of the lung were observed under fight microscope. Results： Compared with that in NS group, the expression of HO-1 and iNOS was markedly increased in LPS group （P 〈0.01）. In RPR-treatment, RPR-prevention, and Hemin groups, the expression of iNOS was significantly lower, while the expression of HO-1 was higher than that in LPS group （P〈0.05）. The protein content, the ratio of neutrophiles in bronchouiveolar lavage fluid, the content of MDA and the activity of serum NO in LPS group were significantly higher than those in NS group （ P〈0.01 ）. There was a significant decrease in the level of arterial bicarbonate and partial pressure of oxygen in the LPS group （P 〈0.01）; these parameters of lung injury however, were significantly lower in RPR-treatment, RPR- prevention, and Heroin groups than LPS group （P〈0.05 or P〈0.01 ）. The pathologic changes of lung tissues were substantially attenuated in RPR-treatment, RPR- prevention, and Hemin groups than LPS group. Conclusions ： The high expression of HO-1 reflects an important protective function of the body during lipopolysaccharide-induced acute lung injury. The acute lung injury is related to the inhibition of iNOS expression and the induction of HO-1 expression.     

抑制骨桥蛋白表达降低肺癌侵袭和增殖的机制

目的 探讨抑制骨桥蛋白(OPN)表达降低肺癌细胞株A549侵袭、增殖的机制.方法 构建针对人OPN mRNA干扰质粒pENTRTM/U6-INF(pINF-1)及对照质粒pENTRTM/U6-CTR(pCTR),将其转染A549细胞,Western blot测定OPN、基质金属蛋白酶(MMP)和促分裂素原活化蛋白激酶(MAPK)信号通路相关蛋白的表达;明胶酶谱检测MMP的表达.结果 与空白对照组(1.20±0.15)比较,转染72 h后pINF-1组OPN蛋白表达(0.15±0.04)下降87%,与对照组比差异有统计学意义(P＜0.05).Western blot的结果显示,pINF-1组细胞磷酸化细胞外信号调节激酶1/2(pERK1/2)、磷酸化丝裂原细胞外激酶(pMEK)和MMP-2的表达明显下降,差异有统计学意义(P＜0.01);而MMP-9表达差异无统计学意义(P＞0.05).明胶酶谱结果同样表明pINF-1组MMP-2的表达明显下降(P＜0.01).结论 抑制OPN的表达降低肺癌细胞株A549侵袭力和增殖的机制可能与抑制MAPK信号通路和MMP-2的表达有关.

Abstract：

Objective To explore the mechanism of invasion and proliferation of lung cancer cell line A549 mediated by osteopontin. Methods One double-stranded DNA vectors pENTRTM/U6-INF ( pINF-1 ) targeting the mRNA of human osteopontin ( OPN), and the control vector pENTRTM/U6-CTR (pCTR) mismatching with mRNA of OPN were constructed, and then they were transfected into human A549 cells with high metastatic potentials. Western blotting was used to quantify the protein level of OPN,matrix metalloproteinases (MMPs) and mitogen-activated protein kinases (MAPK). The activity of MMPs was detected by gelatin zymography. Parallel experiments were performed in sextuplicate. Results As compared with control group only transfected with LipofectamineTM 2000, OPN protein level in pINF-1 group was decreased by 87% 72 h after transfection (P ＜0. 05), and no significant difference was found in the group transfected with pCTR. Moreover, the expression levels of phosphorylated extracellular signal-regulated kinases 1/2 (pERK1/2), phosphorylated MAPK/ERK1/2 kinase (pMEK) and MMP-2 protein were also decreased in pINF-1 group (P ＜ 0. 01 ). The activity of MMP-2 but not MMP-9 was decreased significantly in pINF-1 group (P ＜ 0. 01 ). Conclusion OPN plays an important role in metastasis as well as tumor growth of lung cancer cells probably through activation of the MAPK pathways and MMP-2.     

In vitro lipofectamine mediated NF-κB decoy oligodeoxynucleotides transfection of Kupffer cells

Objective To study the transfection effects of nuclear factor-KappaB(NF-κB)decoy oligodeoxynucleotides(ODN) to Kupffer cells (KCs) mediated by lipofectamine,and investigate it's suppression effects on KCs activation. Methods Twenty-four Wistar rats were divided into three groups (n=8).(1)Control group,in which the normal KCs were isolated.(2)LPS group,in which 1 ms/L LPs was added to the culture system.(3)NF-κB decoy ODN group,in which KCs were transduced with NF-κB decoy ODN (4μg×105KCs)prior to LPS stimulation.The transfection efficiency Was assayed,and the phagocytosis function,NF-κB(P65) translocation,CD40 mRNA expression of KCs were also detected respectively. Results Kupffer cells were obviously activated after LPS stimulation.the phagocytosis function was reinforced.the activity of NF-κB transloeated from cytoplasm into nucleus was obviosly increaced.The co-stimulatory molecules expression(CD40 mRNA)significantly increased compared with control group(t=4.01,P<0.01).NF-κB decoy oligodeoxynucleotides can efficiently transfected into KCs mediated by lipofectamine,which can obviously suppress KCs activation,and downregulate the expression of downstream gene(compared with LPS group,t=4.89,P<0.01). Condusion NF-κB decoy ODN can efficiently transfect into KCs and inhibit it's activation.     

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

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.     

血小板源性生长因子BB对大鼠肌腱愈合和肌腱粘连的影响

目的 了解血小板源性生长因子BB(PDGF-BB)基因转染大鼠肌腱细胞对肌腱愈合及肌腱粘连的影响. 方法 将90只SD大鼠制成跟腱损伤模型,按随机数字表法分为3组,每组30只:实验组,肌腱断端注射20μL转染PDGF-BB基因的大鼠肌腱细胞(1×108个/mL);对照组,肌腱断端注射20μL未行转染的大鼠肌腱细胞(1×108个/mL);空白对照组,不做任何处理.6-0丝线行改良Kessler法缝合跟腱,管型石膏固定1周.通过基因测序及RT-PCR鉴定转染PDGF-BB基因的大鼠肌腱细胞.分别于术后3 d和1、2、4、8周取各组大鼠肌腱组织样本,行大体、组织学观察以及生物力学检测,对比各组肌腱粘连度、组织中Fb数量与胶原纤维含量、肌腱最大抗拉力及最大滑动距离、组织中PDGF-BB的浓度.对数据行t检验. 结果(1)转染的肌腱细胞经RT-PCR以及基因测序证实在体外稳定表达PDGF-BB mRNA.(2)各组大鼠术后3 d肌腱均出现较明显肿胀及炎性细胞浸润,实验组改变较其他组明显轻微;随后各组情况均逐渐好转.术后4、8周肌腱粘连度分级组间比较未见明显差异.(3)实验组Fb数在术后2、4、8周显著低于对照组和空白对照组(t值分别为2.94、4.26、5.76和4.00、3.83、6.12,P＜0.05或P＜0.01).(4)实验组术后4周胶原纤维含量为(43±6)%,较对照组[(55±8)%]与空白对照组[(61±8)%]显著下降(t值分别为2.94和4.41,P＜0.05或P＜0.01).(5)术后4、8周实验组肌腱最大滑动距离为(3.25±0.33)、(3.65±0.21)mm,显著高于对照组的(2.29±0.40)、(2.21±0.37)mm和空白对照组的(2.01±0.23)、(1.89±0.24)mm(t值分别为4.53、8.29和7.55、13.52,P值均小于0.01),但其肌腱最大抗拉力与另2组比较差异无统计学意义(t值分别为0.41、0.41和0.77、0.72,P值均大于0.05).(6)术后3 d和2、4周,实验组肌腱组织中PDGF-BB浓度为(12.95±1.36)、(8.32±0.94)、(9.10±1.06)ng/mL,均显著高于对照组的(1.13±0.21)、(2.07±0.48)、(3.85±0.39)ng/mL(t值分别为21.04、14.50、11.39,P值均小于0.01). 结论 转染PDGF-BB基因肌腱细胞有促进肌腱内源性愈合、减轻肌腱粘连的作用.     

微小RNA-182靶向调控第10号染色体上缺失与张力蛋白同源的磷酸酯酶基因/磷脂酰肌醇-3-激酶/蛋白激酶B信号通路对肝癌干细胞生物学行为的影响及其机制

目的观察微小RNA(miR)-182靶向调控第10号染色体上缺失与张力蛋白同源的磷酸酯酶基因/磷脂酰肌醇-3-激酶/蛋白激酶B(PTEN/PI3K/Akt)信号通路对肝癌干细胞(LCSCs)生物学行为的影响,并探讨其作用机制。方法采用免疫磁珠干细胞分选系统从人肝癌细胞(HepG2)中分选出LCSCs,然后分为空白对照组、阴性对照组及miR-182模拟物(mimics)组,细胞转染后检测各组miR-182 mRNA表达水平及生物学行为改变,同时检测PTEN/PI3K/Akt信号通路相关蛋白表达水平。多组间计量资料比较采用单因素方差分析,组间进一步两两比较采用LSD-t检验,计数资料比较采用χ2检验。结果miR-182 mimics组miR-182 mRNA表达水平(3.623±0.702)高于空白对照组(0.985±0.081)及阴性对照组(0.967±0.075),差异有统计学意义(t=26.239、27.105,P<0.05),空白对照组与阴性对照组比较差异无统计学意义(t=0.312,P>0.05);miR-182 mimics组转染后24、48、72 h时的细胞增殖率[(17.67±3.52)%、(35.67±7.74)%、(61.36±10.26)%]及迁移[(47.25±3.83)%]、侵袭能力[(207±28个)]均高于空白对照组[(11.91±1.87)%、(23.12±5.31)%、(40.79±8.71)%;(18.21±1.73)%;(128±17)个]及阴性对照组[(12.03±1.95)%、(23.80±5.45)%、(41.06±9.02)%;(18.37±1.69)%;(126±15个)],差异有统计学意义(F=12.304、13.173、14.065;t=29.116,29.305;t=17.390,17.214,P<0.05),而转染后24、48、72 h时的细胞凋亡率[(6.36±0.82)%、(12.07±1.46)%、(20.24±2.83)%]低于空白对照组[(9.79±1.12)%、(22.18±3.27)%、(38.12±4.85)%]、阴性对照组[(10.04±1.25)%、(21.73±3.09)%、(37.92±4.77)%],差异有统计学意义(F=11.512、12.091、12.762,P<0.05),空白对照组与阴性对照组各生物学行为比较差异无统计学意义(t=0.277、0.294、0.256、0.364、0.302、0.241、0.332,P>0.05);miR-182 mimics组转染后PTEN蛋白表达水平(0.235±0.024)低于空白对照组(0.494±0.053)、阴性对照组(0.487±0.057),而p-Akt、p-PI3K蛋白表达水平(0.871±0.110、0.396±0.042)高于空白对照组(0.320±0.036、0.122±0.017)、阴性对照组(0.325±0.039、0.127±0.019),差异有统计学意义(t=13.512、13.473;t=21.074、21.023;17.211、17.192,P<0.05),各组Akt、PI3K蛋白表达水平比较差异无统计学意义(t=0.341、0.230、0.371、0.434、0.442、0.274,P>0.05),空白对照组与阴性对照组PTEN、p-Akt、p-PI3K蛋白表达水平比较差异无统计学意义(t=0.265、0.271、0.375,P>0.05)。结论miR-182可能通过抑制PTEN而激活PI3K/Akt信号通路,进而起到增强LCSCs增殖、迁移及侵袭能力和抑制LCSCs凋亡的作用。     

γ干扰素与肿瘤坏死因子α对肠上皮屏障功能影响的实验研究

目的 观察炎症介质γ干扰素及TNF-α联合作用对肠上皮屏障功能的影响并探讨其分子机制.方法建立人肠上皮细胞株Caco-2单层细胞培养模型,分别在预处理的24孔板与6孔板中采用DMEM培养基培养.将2种培养板中细胞均按随机数字表法分为对照组(常规培养)、γ干扰素组(加入终浓度为10 ng/mL γ干扰素培养)、TNF-α组(加入终浓度为10 ng/mL TNF-α培养)、γ干扰素+TNF-α组(加入终浓度均为10 ng/mL的γ干扰素与TNF-α培养).24孔板细胞处理后0 h(即刻)及6、12、24、36、48 h,用电阻测定仪检测肠上皮细胞跨上皮电阻(TER);于48 h分别采用异硫氰酸荧光素-葡聚糖荧光示踪法与免疫荧光法,检测肠上皮细胞通透性及紧密连接咬合蛋白的分布与形态变化.6孔板细胞处理24 h时,用蛋白质印迹法检测咬合蛋白、磷酸化肌球蛋白轻链(pMLC)、肌球蛋白轻链激酶(MLCK)蛋白表达.对数据进行单因素方差分析与t检验.结果 (1)对照组各时相点肠上皮细胞TER无明显变化(F=0.86,P＞0.05);γ干扰素组与TNF-α组TER虽逐渐降低,但与处理后0 h比较差异均无统计学意义(F值分别为1.69、2.47,P值均大于0.05);γ干扰素+TNF-α组TER从24 h起显著低于处理后0 h(t=4.97,P＜0.05),并明显低于其余3组(F=11.54,P＜0.05).(2)γ干扰素+TNF-α组的肠上皮细胞通透性[(1197±215)pmo1]显著高于对照组、γ干扰素组与TNF-α组[(303±93)、(328±76)、(797±177)pmol,t值分别为4.8、5.0、6.9,P值均小于0.01].(3)24 h时各组咬合蛋白表达量无明显变化(F=0.26,P＞0.05).48 h时对照组咬合蛋白排列规则;γ干扰素组及TNF-α组咬合蛋白排列不规则;而γ干扰素+TNF-α组咬合蛋白排列不连续,发生明显重分布,胞质内分布增加.(4)γ干扰素+TNF-α组pMLC蛋白表达量(0.95±0.05)显著高于对照组、γ干扰素组与TNF-α组(0.57±0.12、0.56±0.07、0.59±0.10,F=17.97,P＜0.01),MLCK蛋白表达量(1.57±0.36)也显著高于其余3组(0.85±0.18、1.04±0.23、1.00±0.07,F=9.05,P＜0.05).结论γ干扰素与TNF-α联合作用通过增加MLCK及pMLC蛋白表达,引起肠上皮屏障功能损害.

Abstract：

Objective To investigate the effect of combination of interferon-gamma (IFN-γ) and tumor necrosis factor-alpha ( TNF-α ) on intestinal epithelial barrier function. Methods The Caco-2 monolayers were cultured in DMEM nutrient solution, and then they were inoculated in 24-well or 6-well plate with Transwell inserts. They were divided into control group ( ordinary treatment), IFN-γ group ( with addition of 10 ng/mL IFN-γ), TNF-α group (with addition of 10 ng/mL TNF-α), and IFN-γ plus TNF-α group (with addition of 10 ng/mL TNF-α and 10 ng/mL IFN-γ ). Monolayers inoculated in 24-well plate were collected for determination of transepithelial electrical resistance (TER) with an ohmmeter at post treatment hour (PTH) 0, 6, 12, 24, 36, and 48, the permeability of monolayers with fluorescein isothiocyahate-labeled dextran (FITC-dextran) tracer method at PTH 48, the distribution and morphological change of tight junction occludin with immunofluorescence assay at PTH 48. Monolayers inoculated in 6-well plate were collected for determination of protein expression of occludin, myosin light chain kinase (MLCK), and phosphorylated MLC (pMLC) with Western blot at PTH 24. Data were processed with one-way analysis of vaiiance and t test. Results ( 1 ) There was no obvious difference in TER in control group at each time point ( F = 0. 86, P ＞ 0.05 ). TER in IFN-γgroup and TNF-α group were gradually decreased during PTH 6-48,but showed no statistical difference as compared with that at PTH 0 ( with F value respectively 1.69, 2.47,P values all above 0.05 ). TER in IFN-γplus TNF-α group was significantly decreased from PTH 24 as compared with that at PTH0 ( t =4.97, P ＜0.05) and that in each of the other three groups ( F =11.54,P ＜ 0.05 ). (2) The permeability of monolayers in IFN-γplus TNF-α group [( 1197 ± 215 ) pmol] was significantly higher than that in control group, IFN-γ group, and TNF-α group [( 303 ± 93 ), ( 328 ± 76),(797 ± 177) pmol, with t value respectively 4.8, 5.0, 6.9, P values all below 0.01]. (3) There was no statistical difference in occludin expression at PTH 24 among four groups ( F = 0.26, P ＞ 0.05). The occludin in control group at PTH 48 was regular in arrangement, while that in IFN-γand TNF-α groups was irregular in arrangement. The arrangement of occludin in IFN-γ plus TNF-c group at PTH 48 was interrupted,with obvious redistribution in cytoplasm. (4) The protein expression of pMLC in IFN-γ plus TNF-α group (0.95 ±0.05) was significantly higher than that in control group, IFN-γ group, or TNF-α group (0.57 ±0.12, 0.56 ±0.07, 0.59 ±0. 10, respectively, F = 17.97, P ＜0.01). The protein expression of MLCK in IFN-γplus TNF-α group (1.57 ±0.36) was also significantly higher than that in control, IFN-γ, TNF-α groups (0.85 ± 0.18, 1.04 ± 0. 23, 1.00 ± 0.07, respectively, F = 9.05, P ＜ 0.05 ). Conclusions Combination of IFN-γand TNF-α can induce intestinal epithelial barrier dysfunction by up-regulating MLCK protein expression and promoting MLC phosphorylation.     

c-Jun氨基末端激酶信号通路对缺氧上调血管内皮细胞钙/钙调蛋白依赖性丝氨酸蛋白激酶表达的影响

目的 了解缺氧对钙／钙调蛋白依赖性丝氨酸蛋白激酶（CASK）表达的影响及c-Jun氨基末端激酶（JNK）信号通路在其中的作用。方法 将人血管内皮细胞株EA．hy926进行缺氧处理3h后继续常规培养0、12、24、48、72h，同时设常氧培养对照。采用蛋白质印迹法检测CASK的表达。构建CASK启动子区荧光素酶报告基因质粒。用其转染细胞后，于常氧及缺氧培养1、3、6、12h裂解细胞提取总蛋白，检测报告基因萤火虫荧光素酶及内参照海肾素荧光素酶活性，并用蛋白质印迹法检测JNK磷酸化情况。在培养的细胞中分别加入不同剂量（0、10、100nmo/L，1、10μmol／L）的JNK抑制剂SP600125预处理1h后再缺氧培养3h，观察其对CASK表达的影响。结果缺氧处理后常规培养0～72h，细胞CASK持续保持高表达，并明显高于常氧组。随着缺氧时间延长荧光素酶相对活性普遍增加，均高于常氧组（0．010±0．003，P〈0．01），且缺氧12h达峰值（0．192±0．023）。JNK的磷酸化随缺氧时间延长逐渐增强。加入SP600125后，CASK的表达显著降低，并呈剂量一效应依赖性，其浓度为10μmol／L时，抑制效率达高峰。结论 缺氧上调血管内皮细胞CASK的表达部分依赖于JNK信号通路活化。     

长链非编码RNA反义RNA 1靶向微小RNA-501-3p对食管癌细胞恶性生物学行为影响的实验研究

目的探讨长链非编码RNA(lncRNA)胸腺生成素反义RNA 1(TMPO-AS1)对食管癌细胞恶性生物学行为的影响及其机制。方法2016年6月至2019年12月,实时荧光定量聚合酶链反应(RT-qPCR)检测20例食管癌组织和癌旁组织中lncRNA TMPO-AS1和微小RNA(miR)-501-3p的水平,食管癌Eca109细胞分为lncRNA TMPO-AS1干扰组(转染si-NC和si-TMPO-AS1);miR-501-3p过表达组(转染miR-NC和miR-501-3p);lncRNA TMPO-AS1过表达组(转染pcDNA和pcDNA-TMPO-AS1);lncRNA TMPO-AS1和miR-501-3p共抑制组(转染si-TMPO-AS1+anti-miR-NC和si-TMPO-AS1+anti-miR-501-3p)。噻唑蓝(MTT)法、流式细胞术和Transwell实验分别检测食管癌Eca109细胞增殖、凋亡率、细胞迁移和侵袭能力,蛋白质印迹法(Western blot)检测相关蛋白水平,双荧光素酶报告系统验证lncRNA TMPO-AS1与miR-501-3p的调控关系。两组间比较采用独立样本t检验,多组间比较采用单因素方差进行分析。结果食管癌组织组中的lncRNA TMPO-AS1水平(2.64±0.26)高于癌旁组织(1.00±0.09,t=26.657,P<0.05),miR-501-3p水平(0.44±0.04)低于癌旁组织(1.00±0.07,t=31.063,P<0.05);干扰lncRNA TMPO-AS1的Eca109细胞24 h增殖(0.36±0.03)低于si-NC组(0.39±0.03,t=2.121,P<0.05),48 h增殖(0.45±0.04)低于si-NC组(0.75±0.07,t=11.163,P<0.05),72 h增殖(0.57±0.05)低于si-NC组(1.16±0.09,t=17.191,P<0.05),迁移细胞数[(54.14±5.65)个]低于si-NC组[(113.02±9.87)个,t=15.531,P<0.05],侵袭细胞数[(47.69±5.01)个]低于si-NC组[(96.32±9.88)个,t=13.169,P<0.05],细胞凋亡率[(22.15±2.22)%]高于si-NC组[(6.98±0.69)%,t=19.576,P<0.05];过表达miR-501-3p的Eca109细胞48 h增殖(0.51±0.05)低于miR-NC组(0.77±0.07,t=9.067,P<0.05),72 h增殖(0.65±0.06)低于miR-NC组(1.15±0.09,t=13.867,P<0.05),迁移细胞数[(61.23±6.33)个]低于miR-NC组[(115.25±9.25)个,t=14.458,P<0.05],侵袭细胞数[(53.14±5.33)]低于miR-NC组[(98.32±8.47)个,t=13.543,P<0.05],细胞凋亡[(19.58±1.74)%]高于miR-NC组[(7.23±0.77)%,t=19.471,P<0.05],差异均有统计学意义。结论lncRNA TMPO-AS1通过靶向miR-501-3p促进食管癌细胞的恶性生物学行为,可被视为食管癌患者的潜在治疗靶标。     

结直肠癌细胞中lnczc3h7a的表达及对肿瘤细胞增殖和迁移的作用及机制

目的研究结直肠癌细胞中Lnczc3h7a的表达及对肿瘤细胞增殖和迁移的作用机制。方法选择6种结直肠癌细胞株人结肠癌细胞(HT-29),人结直肠癌细胞(HCT-116),人结肠癌细胞(SW-60),人结直肠腺癌细胞(COLO320DM),人结肠癌细胞(Lovo)和人结直肠腺癌上皮细胞(DLD-1)与正常结直肠上皮细胞系。以Lnczc3h7a模拟物(mimics)、Lnczc3h7a抑制剂(inhibitor)及空白对照分别转染结直肠癌细胞SW60,采用细胞计数试剂盒(CCK-8)法和细胞划痕实验分别检测转染Lnczc3h7a mimics和Lnczc3h7a inhibitor后结直肠癌细胞的增殖和迁移能力,免疫印迹试验(Western blot)法检测结直肠癌细胞SW60中胶原三股螺旋重复蛋白6(CTHRC6)的表达。分别使用过表达体系和siRNA分别改变细胞系中Lnczc3h7a和CTHRC6)的表达,检测结直肠癌细胞的增殖和迁移能力。再采用CRISP-Cas9技术敲除Lnczc3h7a和CTHRC6),检测结直肠癌细胞的增殖和迁移能力。结果HT-29、HCT-116、SW-60、COLO320DM、Lovo和DLD-1中的Lnczc3h7a表达水平分别为0.65±0.02、0.67±0.02、0.84±0.04、0.58±0.02、0.70±0.02、0.52±0.30,均显著低于正常结直肠上皮细胞系(1.00±0.00,F=5.298、5.462、8.172、4.698、7.012、4.463,P值均<0.05),差异均有统计学意义。细胞转染后第3、4、5天,模拟物组(0.33±0.02、0.58±0.01、0.65±0.02)及对照组(0.41±0.05、0.71±0.02、0.90±0.04)结直肠癌细胞增殖能力均低于抑制剂组(0.51±0.03、0.88±0.04、1.07±0.08),且模拟物组结直肠癌细胞增殖能力低于对照组(F=5.104、6.873、8.284,P<0.05),差异均有统计学意义。细胞培养24、48 h时,模拟物组(184.92±34.82、157.71±27.47)及对照组(411.86±62.35、412.94±63.19)的结直肠癌细胞迁移能力低于抑制剂组(466.92±47.37、470.83±47.82),且模拟物组结直肠癌细胞迁移能力低于对照组(F=1.482、5.104,P值均<0.05),差异均有统计学意义。细胞转染24 h时模拟物组及对照组的CTHRC6蛋白表达分别为0.31±0.04、0.62±0.13,均低于抑制剂组(0.86±0.17),且模拟物组细胞CTHRC6蛋白表达低于对照组(t=41.772,P值均<0.05),差异均有统计学意义。结论结直肠癌细胞中Lnczc3h7a存在明显低表达,其可能具有抑制结直肠癌细胞增殖、迁移的作用,且作用机制可能和抑制CTHRC6蛋白表达密切相关。     

过氧化物酶体增殖物激活受体γ1基因转染诱导肝星状细胞表型及功能的变化

目的 用慢病毒介导PPARγ1基因在HSC中过表达,观察对HSC的增殖及细胞外基质合成的影响.方法 用慢病毒质粒系统在293T细胞中包装出重组慢病毒Lent/PPARγ1并感染HSC,用RT-PCR及WB检测目的 基因及目的 蛋白的表达,用噻唑蓝(MIT)比色法观察对HSC增殖的影响,用RT-PCR观察对Ⅰ型胶原、TCFβ1表达的影响.结果 成功构建Lent/PPARγ1并感染HSC,RT-PCR及WB检测到目的 基因及蛋白的表达,MTT检测表明Lent/PPARγ1组12、96 h的A值分别为0.420±0.031、0.638±0.040,与对照组0.448±0.019、0.810±0.070比较差异有统计学意义(P<0.05);RT-PCR检测表明Lent/PPARγ1组I型胶原、TGFβ1的2-△△Ct值分别为1.496±0.359、0.667±0.153,与对照组2.602±0.301、1.008±0.102比较,差异有统计学意义(P<0.01).结论 成功构建携带PPARγ1的重组慢病毒载体并感染HSC,PPARγ1基因过表达可抑制HSC的增殖和活化.     

小干扰RNA沉默血管内皮生长因子对ACHN肾癌细胞黏附、侵袭及迁移的影响

目的 观察小干扰RNA (siRNA)沉默血管内皮生长因子(VEGF)对ACHN肾细胞癌细胞生物学行为的影响.方法 化学合成针对VEGF的小干扰RNA,实验分4组,转染后收集细胞,通过蛋白印迹方法检测VEGF的表达,噻唑蓝(MTT)比色法、细胞黏附实验、划痕实验及Transwell法测定细胞的增殖、黏附、迁移及侵袭能力.结果 siRNA 1～2组VEGF表达水平明显低于空白对照组及阴性对照组;在24、48、72 h,siRNA 1～2的增殖抑制率均高于空白对照组及阴性对照组(P＜0.05),其中以siRNA2组最为显著;与空白对照组比较,siRNA 1～2组的细胞黏附数量明显下降[(81.5±3.1)％比(40.5±2.6)％、P＜0.05,(81.5±3.1)％比(22.5±2.4)％、P＜0.05],其中以siRNA2组最为明显;siRNA1～2组的细胞迁移数量明显下降(162±9比81±5,P＜0.05;162±9比38±4,P＜0.05);siRNA1～2组细胞侵袭能力明显下降(P＜0.05),且siRNA 2组的细胞侵袭能力明显低于siRNA 1组(P＜0.05).结论 VEGF基因在肾细胞癌细胞黏附、迁移和侵袭中发挥着重要作用;以靶向VEGF的siRNA转染肾细胞癌细胞,可抑制肾细胞癌细胞黏附、迁移和侵袭能力.     

WWOX表达对胆管癌QBC939细胞凋亡的影响及其机制

目的 探讨含有WW结构域的氧化还原酶基因(WWOX)表达对胆管癌QBC939细胞凋亡的影响及其作用机制.方法 用脂质体转染法将WWOX重组真核表达质粒转染QBC939细胞;采用荧光定量逆转录－聚合酶链反应(RT-PCR)和Westem blot法鉴定WWOX在QBC939细胞中的表达;流式细胞仪(FCM)法检测转染前后各细胞凋亡率的变化;JC-l染色法检测细胞线粒体膜电位(△Ψm)变化;荧光定量RT-PCR和Western blot法检测胆管癌细胞bcl-2表达的变化;将未转染和转染空质粒的细胞作为对照组接种到裸鼠皮下以检测荷瘤,TUNEL方法原位检测移植瘤的凋亡.结果 建立了稳定表达WWOX基因的QBC939/WWOX细胞株,mRNA及蛋白表达明显增加.FCM显示QBC939/WWOX组的细胞凋亡率明显增高[(1.24±0.35)％比(1.73±0.48)％比(21.40±2.35)％,P＜O.01],JC-l显示转染组的线粒体膜电位下降[(4.27±0.64)％比(4.96±0.52)％比(28.60±3.94)％,P＜O.01],bcl-2 mRNA及蛋白的表达均显著降低(P＜0.05).转染组的皮下肿瘤较对照组生长速度明显减慢(P＜0.05),TUNEL实验证实转染组的皮下肿瘤凋亡指数为(13.6±1.5)％,较对照组明显增高,差异有统计学意义(P＜0.O1).结论 WWOX基因能促进胆管癌细胞的凋亡,其机制可能与下调bcl-2的表达,激活线粒体凋亡通路有关.     

Numb基因上调对人肾细胞癌细胞周期和增殖的影响

目的 研究Numb基因上调对人肾细胞癌的细胞周期和增殖能力的影响及相关机制.方法 选取人肾细胞癌细胞786-O为研究对象,使用Numb-ORF表达质粒转染细胞为实验组,设置阴性对照及空白对照组.采用荧光定量聚合酶链式反应和蛋白质印迹技术检测各组Numb基因和肿瘤增殖抗原Ki-67的表达;采用流式细胞技术检测细胞周期,计算G0/G1期细胞比例、增殖指数(PI)和S期分数(SPF);以MTS法检测细胞的增殖活力.结果 实验组Numb的相对表达水平为(18.97±1.49),显著的高于阴性对照组(3.34±0.41)和空白对照组(3.21±0.39);实验组Ki-67的相对表达水平为(4.31 ±0.58),明显少于阴性对照组(10.35±0.84)和空白对照组(9.89±0.73),差异有统计学意义(P＜0.01).细胞周期检测:实验组中G0/G1期细胞的比例(％)为60.47±1.58,明显高于阴性对照组(49.67±1.97)和空白对照组(52.52±2.47)(P＜0.01).实验组的PI和SPF均低于两对照组(P＜0.01).增殖检测:实验组在24、48、72h的吸光度(A)值均低于两对照组(P＜0.01).结论 在786-O细胞中上调Numb基因可以抑制Ki-67的表达,减低细胞的PI和SPF,促使细胞发生G0/G1期阻滞,抑制细胞的增殖活力,实验结果提示Numb基因在肾细胞癌中可能发挥抑癌因子作用.