Construction of Porcine CCK pDNA and Its Expression in COS-7 Cells

CCK correlates with the generation and progression of pancreatic cancer. The research aims to construct eukaryotic expression plasmid pIRES2-EGFP/CCK (CCK pDNA) and transiently express it in COS-7 cells. Total RNA was extracted from porcine intestinal mucosa. RT-PCR was used to amplify the aimed segments CCKcDNA which was then digested with EcoR1 and BamH1 and inserted into a eukaryotic expression plasmid pIRES2-EGFP to construct CCK pDNA. The con- structed plasmid was transfected into COS-7 cells by lepofectamineTM2000-mediated transfer method. The expression of CCK in transfected COS-7 cells was detected 24, 48 and 72 h post-transfection with fluorescence microscopy and the expression level of CCK mRNA in transfected COS-7 cells was assayed by using RT-PCR. The results showed CCK pDNA was successfully constructed and expressed transiently in COS-7 cells. Green fluorescent protein could be detected in the COS-7 cells transfected with porcine CCK pDNA 24 h post-transfection. At 48th h post-transfection, the number of positive cells was increased significantly and much brighter green fluorescence could be detected. And 72 h post-transfection, the green fluorescence of positive cells became even stronger, while no green fluorescence was detected in the control group. The expression of CCK mRNA in the cells was detectable by using RT-PCR. In COS-7 cells transfected with CCK pDNA a high level of porcine CCK mRNA was detected while no expression of porcine CCKmRNA was found in the cells trans- fected with null plasmid. It was concluded CCK pDNA was expressed successfully in COS-7 cells, which lays a foundation for further research on the relationship between CCK and tumor.

Dodecylamine Derivative of Hydroxocobalamin Acts as a Potent Inhibitor of Cobalamin-Dependent Methionine Synthase in Mammalian Cultured COS-7 Cells

We evaluated whether the dodecylamine derivative of hydroxocobalamin acts as a potent inhibitor of cobalamin-dependent enzymes in an African green monkey kidney cell, COS-7. When the dodecylamine derivative (1.0 μmol/L) did not show any cytotoxicity in the cultured cells, the derivative could not affect methylmalonyl-CoA mutase (holo-enzyme) activity, but significantly inhibit methionine synthase (holo-enzyme) activity in the cell homogenates of COS-7 grown in 1.0 μmol/L hydroxocobalamin-supplemented medium. An immunoblot analysis indicated that the dodecylamine derivative could not decrease the protein level of methionine synthase, but significantly inhibit the enzyme activity.

EXPRESSION OF HUMAN BETA-DEFENSIN 3 IN COS-7 CELL

To establish a cell line for stable expression of human beta-defensin 3 (hBD3). Methods Full length cDNA of hBD3 was isolated from previously constructed pGEM-hBD3 and then inserted into pcDNA3. The recombinant vector identified carrying hBD3 with right direction was introduced into COS-7 cells by Lipofe-ctamine. Cell clones survived in G418-rich medium and with stable expression of hBD3 in both mRNA and protein levels were identified by RT-PCR and Western blot respectively. Genomic integration of the hBD3 gene with the COS-7 cells was confirmed by Southern dot blot and primary analysis. The antimicrobial activity of the secreted hBD3 was also evaluated. Results COS-7 cells transfected with pcDNA3-hBD3 expressed hBD3 stably in mRNA and protein level. Southern dot blot analysis showed successful integration of the hBD3 gene into the genome of COS-7 cell and the hBD-3 protein secreted into the culture medium showed antimicrobial activity. Conclusion We successfully established a hBD3-expressing cell line.

非剥脱点阵激光联合侧柏叶酊对斑秃小鼠IL-7/IL-7Rα信号通路和Tregs细胞亚群的影响

目的:研究1565 nm非剥脱点阵激光联合侧柏叶酊(Platycladus orientalis tincture,POT)对斑秃(Alopecia areata,AA)小鼠治疗作用以及对白细胞介素7(Interleukin 7,IL-7)/白细胞介素7受体α(Interleukin-7 receptorα,IL-7Rα)信号通路和调节性T细胞(Regulatory T cells,Tregs)亚群的影响。方法:将50只成年雄性C3H/HeJ小鼠随机分为对照组(C组),模型组[M组,环磷酰胺(Cyclophosphamide,CTX)诱导AA模型],M+1565 nm组(1565 nm非剥脱点阵激光治疗AA),M+POT组(POT治疗AA)、M+1565 nm+POT组(1565 nm非剥脱点阵激光联合POT治疗AA),每组10只。流式细胞术检测C组和M组皮损组织中Tregs细胞亚群的比例和所有组血液中单个核细胞中Tregs细胞亚群的比例。Western blot法检测各组小鼠皮损组织中IL-7和IL-7Rα的表达。结果:与C组比,M组皮肤组织IL-7和IL-7Rα的表达均明显增加,而且Tregs细胞比例明显减少(P<0.05)。与M组比,M+1565 nm组和M+POT组IL-7的表达均降低(P<0.05)。与M组比,M+1565 nm+POT组IL-7和IL-7Rα的表达均降低,且Tregs细胞比例都显著增加(P<0.05)。结论:1565 nm非剥脱点阵激光联合POT治疗可以抑制斑秃小鼠IL-7/IL-7Rα信号并减少Tregs细胞的比例。

DHCR7基因在胃癌中的表达及其与免疫相关基因的关系

目的探究7-脱氢胆固醇还原酶(DHCR7)基因在胃癌中的表达及其与免疫相关基因的关系。方法使用UALCAN、TIMER数据库分析DHCR7基因在不同类型肿瘤中的表达情况。使用GEPIA、TCGA、GEO数据库分析DHCR7基因在胃癌中的表达。Kaplan-Meier Plotter数据库分析DHCR7基因表达与胃癌患者预后的相关性。通过cBioPortal数据库找出与DHCR7共表达的基因,并展示这些基因中相关系数比较高的基因。对胃癌中与DHCR7表达正负相关的基因进行基因本体分析(GO)和京都基因与基因组百科全书(KEGG)分析,首先分析DHCR7基因与CD8^(+)T细胞以及招募CD8^(+)T细胞相关趋化因子的相关性;其次分析DHCR7基因与免疫激活相关基因的相关性;最后分析DHCR7表达与胃癌患者临床病理学特征的关联。结果DHCR7基因在大多数肿瘤类型中均有高表达趋势。DHCR7基因在胃癌中的表达高于正常胃黏膜。Kaplan-Meier Plotter数据库中201790-s-at芯片结果显示高表达DHCR7组患者生存期较短。与DHCR7负相关基因的GO、KEGG通路富集分析主要富集在免疫相关功能和信号通路上,DHCR7与CD8^(+)T细胞、招募CD8^(+)T细胞相关的趋化因子以及免疫激活基因都具有负相关性。DHCR7高表达与胃癌患者年龄呈正相关。结论DHCR7在胃癌组织中呈高表达,高表达DHCR7患者预后不良,DHCR7基因能够影响胃癌免疫微环境,有望成为胃癌免疫治疗的新靶点。

雷公藤内酯醇通过调控miR-142-3p/HSP70通路抑制人乳腺癌MCF-7细胞增殖、侵袭和迁移

目的:探究雷公藤内酯醇(TP)通过miR-142-3p/HSP70信号通路对人乳腺癌MCF-7细胞恶性生物学行为的影响。方法:常规培养MCF-7细胞,将其分为6组:对照组、TP组、miR-142-3p inhibitor组、TP+inhibitor组、miR-142-3p mimic组和TP+mimic组,用转染试剂将相应的核酸或质粒转染MCF-7细胞。qPCR法、EdU细胞增殖实验、Transwell小室实验、细胞划痕实验、WB法分别检测转染后各组MCF-7细胞中miR-142-3p和HSP70 mRNA的表达,MCF-7细胞的增殖、侵袭、迁移能力和HSP70蛋白表达水平。结果:TP或miR-142-3p过表达能显著促进MCF-7细胞中miR-142-3p和HSP70的表达,敲减miR-142-3p则可明显抑制MCF-7细胞中miR-142-3p和HSP70的表达,TP可逆转由敲减miR-142-3p对MCF-7细胞中miR-142-3p和HSP70表达的影响;TP、过表达miR-142-3p均可明显抑制MCF-7细胞的增殖、迁移和侵袭能力(均P<0.05),敲减miR-142-3p则均可促进MCF-7细胞的增殖、迁移和侵袭能力(均P<0.05),TP可逆转由敲减miR-142-3p对MCF-7细胞恶性生物学行为的影响(均P<0.05)。结论:TP可通过调控miR-142-3p/HSP70信号通路,进而抑制MCF-7细胞的增殖、侵袭和迁移能力。

USP7-MDM2-p53信号轴对子宫内膜癌细胞增殖、凋亡和细胞周期的影响

目的:探讨泛素特异性蛋白酶7(USP7)调节Mdm2 p53结合蛋白同源物(MDM2)-p53轴对子宫内膜癌细胞增殖、凋亡和细胞周期的影响。方法:Western blot检测人子宫内膜癌组织、癌旁组织、人子宫内膜上皮细胞hEEC及人子宫内膜癌细胞系Ishikawa、HEC-1-A、KLE中USP7蛋白表达。将Ishikawa细胞分为NC组、P22077(USP7抑制剂)组、pcDNA组、pcDNA-MDM2组、P22077+pcDNA组、P22077+pcDNA-MDM2组,CCK-8法和克隆形成实验检测Ishikawa细胞增殖;流式细胞术检测Ishikawa细胞凋亡与细胞周期变化;Western blot检测Ishikawa细胞中USP7、细胞周期蛋白D1(CyclinD1)、周期素依赖性激酶2(CDK2)、Bcl-2相关X蛋白(Bax)、MDM2、p53蛋白表达。以RG7388(MDM2抑制剂)或PFT-α(p53抑制剂)与20μmol/L P22077共处理Ishikawa细胞48 h以验证USP7-MDM2-p53信号轴上下游关系。结果:USP7蛋白在子宫内膜癌组织和细胞中高表达,且Ishikawa细胞中USP7蛋白表达量最高,因此,选择Ishikawa细胞为研究对象。与NC组比较,P22077组Ishikawa细胞OD 450值、克隆形成率、S期和G 2/M期细胞数、USP7、CyclinD1、CDK2、MDM2蛋白表达降低,细胞凋亡率、G_(0)/G_(1)期细胞数、p53、Bax蛋白表达升高(P<0.05);与NC组、pcDNA组比较,pcDNA-MDM2组Ishikawa细胞OD 450值、克隆形成率、S期和G 2/M期细胞数、USP7、CyclinD1、CDK2、MDM2蛋白表达升高,细胞凋亡率、G_(0)/G_(1)期细胞数、p53、Bax蛋白表达降低(P<0.05);与P22077组、P22077+pcDNA组比较,P22077+pcDNA-MDM2组Ishikawa细胞OD 450值、克隆形成率、S期和G 2/M期细胞数、USP7、CyclinD1、CDK2、MDM2蛋白表达升高,细胞凋亡率、G_(0)/G_(1)期细胞数、p53、Bax蛋白表达降低(P<0.05)。p53为USP7-MDM2通路下游分子。结论:抑制USP7表达可能通过下调MDM2来激活p53进而抑制Ishikawa细胞增殖、促进细胞凋亡及周期停滞。

Semaphorin 7A promotes human vascular smooth muscle cell proliferation and migration through theβ-catenin signaling pathway

Background:Vascular smooth muscle cells(VSMCs)undergo a conversion from a contractile phenotype to a proliferative synthetic phenotype,contributing to the pathogenesis of cardiovascular diseases.Semaphorin 7A(SEMA7A)is a glycosylphosphatidylinositol-anchored membrane protein that plays an important role in vascular homeostasis by regulating endothelial cell behaviors.However,the expression and role of SEMA7A in VSMCs remain unclear.Methods:In this study,we screened for VSMC-regulating genes in publicly available datasets and analyzed the expression of SEMA7A in human coronary artery smooth muscle cells(hCASMCs)treated with platelet-derived growth factor-BB(PDGF-BB).The effects of SEMA7A overexpression and knockdown on hCASMC proliferation and migration were examined.The signaling pathways involved in the action of SEMA7A in hCASMCs were determined.Results:Bioinformatic analysis showed that SEMA7A was significantly dysregulated in VSMCs treated with oxidized low-density lipoprotein or overexpressing progerin,a pro-atherogenic gene.The PDGF-BB stimulation led to a concentration-and time-dependent induction of SEMA7A.Depletion of SEMA7A attenuated PDGF-BB-induced hCASMC proliferation and migration.Conversely,overexpression of SEMA7A enhanced hCASMC proliferation and migration.Mechanistically,SEMA7A stimulated the activation of theβ-catenin pathway and upregulated c-Myc,CCND1,and MMP7.Knockdown ofβ-catenin impaired SEMA7A-induced hCASMC proliferation and migration.Conclusions:SEMA7A triggers phenotype switching in VSMCs through theβ-catenin signaling pathway and may serve as a potential therapeutic target for cardiovascular diseases.

基于网络药理学探讨山奈酚-7-O-新橘皮糖苷抗前列腺癌的作用机制

目的 探讨山奈酚-7-O-新橘皮糖苷(kaempferol-7-O-neohesperidoside, K7ON)抗前列腺癌细胞(prostate cancer, PCa)的作用及潜在分子机制。方法 采用CCK-8法检测K7ON对PCa细胞PC3、DU145、C4-2和LNCap增殖的影响;应用细胞划痕实验检测K7ON对DU145细胞迁移能力的影响;SuperPred等数据库获取K7ON和PCa的靶点;从Venny在线平台获取K7ON与PCa的共同靶点,应用String和Cytoscape构建蛋白相互作用(protein-protein interaction, PPI)网络;通过DAVID数据库进行GO和KEGG功能富集分析,构建“药物-靶点-疾病-通路”网络模型。通过流式细胞术检测K7ON对PCa细胞周期的影响;采用Western blot法检测周期相关蛋白Skp2、p27和p21蛋白的表达;应用Sybyl X2.0将Skp2与K7ON进行分子对接。结果 K7ON可显著抑制PCa细胞的增殖和迁移能力。筛选出药物与疾病的交集靶点共34个,其中Skp2、p27等是K7ON治疗PCa的关键靶点,进一步的GO和KEGG功能功能富集表明其机制主要与细胞周期相关。流式细胞术结果表明,K7ON处理可使DU145细胞周期阻滞在S期。与对照组相比,Skp2蛋白表达水平明显下调,p27和p21的蛋白表达水平上调。分子对接结果显示K7ON与受体Skp2具有较好的结合能力。结论 K7ON可抑制PCa细胞的增殖和迁移,使细胞周期阻滞在S期,其机制可能与调控Skp2-p27/p21信号通路相关。

Decreased TRPM7 alleviates high glucose-induced renal tubular epithelial cell injury by inhibiting the HMGB1/TLR4 signaling pathway

Objective:To explore the regulatory mechanism of transient receptor potential melastatin-7(TRPM7)in high glucose-induced renal tubular epithelial cell injury.Methods:The expression of TRPM7 in the serum of diabetic nephropathy patients and high glucose-induced HK-2 cells was detected by RT-qPCR.Then,the TRPM7 interference vector was constructed,and the downstream high mobility group box 1(HMGB1)/Toll-like receptor 4(TLR4)signaling pathway proteins were detected.Next,in addition to interference with TRPM7 expression,overexpression of HMGB1 in high glucose-induced HK-2 cells was performed.Cell activity,apoptosis,oxidative stress levels,and inflammation levels were determined by CCK8,TUNEL,Western blotting,immunofluorescence and related kits.Results:TRPM7 expression was upregulated in the serum of diabetic nephropathy patients and high glucose-induced HK-2 cells.Interference with TRPM7 reduced cell damage,epithelial-mesenchymal transition,oxidative stress,and inflammatory response in high glucose-induced HK-2 cells via inhibiting the HMGB1/TLR4 signaling pathway.However,the effects induced by TRPM7 silencing were abrogated by HMGB1 overexpression.Conclusions:Decreased TRPM7 alleviates high glucose-induced renal tubular epithelial cell injury by inhibiting the HMGB1/TLR4 signaling pathway.Further animal experiments and clinical trials are warranted to verify its effect.

Novel defined N7-methylguanosine modification-related lncRNAs for predicting the prognosis of laryngeal squamous cell carcinoma

Objective:Through integrated bioinformatics analysis,the goal of this work was to find new,characterised N7-methylguanosine modification-related long non-coding RNAs(m7G-lncRNAs)that might be used to predict the prognosis of laryngeal squamous cell carcinoma(LSCC).Methods:The clinical data and LSCC gene expression data for the current investigation were initially retrieved from the TCGA database&sanitised.Then,using co-expression analysis of m7G-associated mRNAs&lncRNAs&differential expression analysis(DEA)among LSCC&normal sample categories,we discovered lncRNAs that were connected to m7G.The prognosis prediction model was built for the training category using univariate&multivariate COX regression&LASSO regression analyses,&the model’s efficacy was checked against the test category data.In addition,we conducted DEA of prognostic m7G-lncRNAs among LSCC&normal sample categories&compiled a list of co-expression networks&the structure of prognosis m7G-lncRNAs.To compare the prognoses for individuals with LSCC in the high-&low-risk categories in the prognosis prediction model,survival and risk assessments were also carried out.Finally,we created a nomogram to accurately forecast the outcomes of LSCC patients&created receiver operating characteristic(ROC)curves to assess the prognosis prediction model’s predictive capability.Results:Using co-expression network analysis&differential expression analysis,we discovered 774 m7G-lncRNAs and 551 DEm7G-lncRNAs,respectively.We then constructed a prognosis prediction model for six m7G-lncRNAs(FLG−AS1,RHOA−IT1,AC020913.3,AC027307.2,AC010973.2 and AC010789.1),identified 32 DEPm7G-lncRNAs,analyzed the correlation between 32 DEPm7G-lncRNAs and 13 DEPm7G-mRNAs,and performed survival analyses and risk analyses of the prognosis prediction model to assess the prognostic performance of LSCC patients.By displaying ROC curves and a nomogram,we finally checked the prognosis prediction model's accuracy.Conclusion:By creating novel predictive lncRNA signatures for clinical diagnosis&therapy,our findings will contribute to understanding the pathogenetic process of LSCC.

肾透明细胞癌中双硫死亡核心基因SLC7A11的孟德尔随机化及生物信息学分析

目的分析溶质载体家族7成员11(SLC7A11)在肾透明细胞癌(ccRCC)发生、发展中的作用及其预后价值。方法采用两样本孟德尔随机化分析以识别与ccRCC风险存在因果关系的基因。使用来自UCSC Xena泛癌队列的RNA测序数据及临床数据分析SLC7A11的表达及预后意义。使用TCGA-KIRC数据(训练集)进行基因集富集分析(GSEA)。随后通过逐步Cox回归分析建立了基于SLC7A11的预后模型,并在E-MATB-1980队列(验证集)中进行了外部验证。结果孟德尔随机化分析显示,SLC7A11水平升高会加重ccRCC的患病风险(HR=1.27,95%CI:1.15~1.40,P<0.001)。SLC7A11在各种肿瘤中过表达,并与高T分期和较差的生存预后相关(P<0.05)。GSEA显示SLC7A11富集在增殖和转移相关通路,包括E2F和上皮-间质转化信号通路。SLC7A11预后模型在训练集(1、3、5年AUC=0.78、0.73、0.71)和验证集(1、3、5年AUC=0.70、0.71、0.72)中均显示出强大的预测性能。结论SLC7A11作为ccRCC的潜在生物标志物和治疗靶点,为精准医学提供了新视角。

Down-regulation of histone deacetylase 7 reduces biological activities of retinal microvascular endothelial cells under high glucose condition and related mechanism

AIM:To investigate the expression and effect of histone deacetylase 7(HDAC7)in human retinal microvascular endothelial cells(HRMECs)under high glucose condition and related mechanism,and the expression of HDAC7 in the retinal tissue in diabetic rats.METHODS:The expression of HDAC7 in HRMECs under high glucose and the retinal tissue from normal or diabetic rats were detected with immunohistochemistry and Western blot.LV-shHDAC7 HRMECs were used to study the effect of HDAC7 on cell activities.Cell count kit-8(CCK-8),5-ethynyl2’-deoxyuridine(EdU),flow cytometry,scratch test,Transwell test and tube formation assay were used to examine the ability of cell proliferation,migration,and angiogenesis.Finally,a preliminary exploration of its mechanism was performed by Western blot.RESULTS:The expression of HDAC7 was both upregulated in retinal tissues of diabetic rats and high glucosetreated HRMECs.Down-regulation of HDAC7 expression significantly reduced the ability of proliferation,migration,and tube formation,and reversed the high glucose-induced high expression of CDK1/Cyclin B1 and vascular endothelial growth factor in high glucose-treated HRMECs.CONCLUSION:High glucose can up-regulate the expression of HDAC7 in HRMECs.Down-regulation of HDAC7 can inhibit HRMECs activities.HDAC7 is proposed to be involved in pathogenesis of diabetic retinopathy and a therapeutic target.

Prediction of Tumor Microenvironment Characteristics and Treatment Response in Lung Squamous Cell Carcinoma by Pseudogene OR7E47P-related Immune Genes

Objective Pseudogenes are initially regarded as nonfunctional genomic sequences,but some pseudogenes regulate tumor initiation and progression by interacting with other genes to modulate their transcriptional activities.Olfactory receptor family 7 subfamily E member 47 pseudogene(OR7E47P)is expressed broadly in lung tissues and has been identified as a positive regulator in the tumor microenvironment(TME)of lung adenocarcinoma(LUAD).This study aimed to elucidate the correlation between OR7E47P and tumor immunity in lung squamous cell carcinoma(LUSC).Methods Clinical and molecular information from The Cancer Genome Atlas(TCGA)LUSC cohort was used to identify OR7E47P-related immune genes(ORIGs)by weighted gene correlation network analysis(WGCNA).Based on the ORIGs,2 OR7E47P clusters were identified using non-negative matrix factorization(NMF)clustering,and the stability of the clustering was tested by an extreme gradient boosting classifier(XGBoost).LASSO-Cox and stepwise regressions were applied to further select prognostic ORIGs and to construct a predictive model(ORPScore)for immunotherapy.The Botling cohorts and 8 immunotherapy cohorts(the Samstein,Braun,Jung,Gide,IMvigor210,Lauss,Van Allen,and Cho cohorts)were included as independent validation cohorts.Results OR7E47P expression was positively correlated with immune cell infiltration and enrichment of immune-related pathways in LUSC.A total of 57 ORIGs were identified to classify the patients into 2 OR7E47P clusters(Cluster 1 and Cluster 2)with distinct immune,mutation,and stromal programs.Compared to Cluster 1,Cluster 2 had more infiltration by immune and stromal cells,lower mutation rates of driver genes,and higher expression of immune-related proteins.The clustering performed well in the internal and 5 external validation cohorts.Based on the 7 ORIGs(HOPX,STX2,WFS,DUSP22,SLFN13,GGCT,and CCSER2),the ORPScore was constructed to predict the prognosis and the treatment response.In addition,the ORPScore was a better prognostic factor and correlated positively with the immunotherapeutic response in cancer patients.The area under the curve values ranged from 0.584 to 0.805 in the 6 independent immunotherapy cohorts.Conclusion Our study suggests a significant correlation between OR7E47P and TME modulation in LUSC.ORIGs can be applied to molecularly stratify patients,and the ORPScore may serve as a biomarker for clinical decision-making regarding individualized prognostication and immunotherapy.

活化α7乙酰胆碱受体促进LPS刺激的人牙髓干细胞牙/骨向分化

目的:探讨活化α7乙酰胆碱受体(alpha 7 nicotinic acetylcholine receptor,α7-nAChR)联合钙离子(calcium ion,Ca^(2+)对LPS刺激的人牙髓干细胞(dental pulp stem cell,DPSC)牙/骨向分化的影响。方法:分离培养DPSC,流式细胞术对DPSC进行表面标志物表达鉴定。CCK-8检测α7-nAChR激动剂PNU-282987和Ca^(2+)对DPSC增殖的影响。通过碱性磷酸酶(alkaline phosphatase,ALP)活性和染色筛选PNU-282987促进DPSC表达ALP活性的最佳浓度。用大肠杆菌脂多糖(lipopolysaccharide,LPS)模拟炎性微环境刺激DPSC。采用免疫印迹分析(Western blot,WB)、实时定量聚合酶链反应(quantitative real-time polymerase chain reaction,RT-qPCR)和茜素红染色等方法检测牙/骨向分化的相关蛋白:Ⅰ型胶原(typeⅠcollagen,COL-I)、牙本质涎磷蛋白(dentin sialoprotein,DSPP)、骨钙素(osteopontin,OPN)、ALP、核心转录因子-2(runt-related transcription factor 2,RUNX2)、成骨细胞特异性转录因子(osterix,OSX),相关基因(COL-I、DSPP、OPN、ALP、RUNX2、OSX)和矿化基质表达情况。Fura-2AM用于检测细胞内Ca^(2+)流动情况。结果:CCK-8实验显示,PNU-282987浓度低于10μmol/L时对细胞增殖无抑制作用,且此浓度处理LPS刺激的DPSC后ALP活性增加最明显;Ca^(2+)浓度低于2 mmol/L对细胞增殖无抑制作用;Western blot和RT-qPCR实验显示,PNU-282987及Ca^(2+)处理后的LPS刺激的DPSC牙/骨向分化相关蛋白(COL-I、DSPP、OPN、ALP、RUNX2、OSX)和相关基因(COL-I、DSPP、OPN、ALP、RUNX2、OSX)的表达及矿化基质形成均明显上调,二者联合后上调最显著(P <0.001)。Fura-2 AM钙离子探针结果显示DPSC细胞内Ca^(2+)浓度增加。结论:10μmol/L PNU-282987联合2 mmol/L Ca^(2+)可以促进LPS刺激的DPSC的牙/骨向分化能力。

Study on regulating mechanisms of oxocrebanine obtained from Stephania hainanensis H.S.Lo et Y.Tsoong on microtubule sites and tubulin in human breast cancer MCF-7 cells

Objective:To determine the destructive ability of oxocrebanine,an anti-breast cancer active compound obtained from Stephania hainanensis H.S.Lo et Y.Tsoong,on microtubule network,and investigate the effect of oxocrebanine on microtubule network homeostasis at both molecular and cellular levels.Methods:the EBI site competition method and molecular docking method were used to determine the occupation of the microtubule site of oxocrebanine.Western Blot was used to detect the effect of oxocrebanine on microtubule-associated proteins including STAT3,PAK1,CAMK4,and PKA.Results:The results of EBI site competition assay showed that the binding of EBI toβ-Tubulin covalent fusions produced adducts that appeared in regions of lower molecular weight thanβ-tubulin(ctrl 2).Molecular docking results showed that oxocrebanine could occupy the colchicine site of microtubule proteins.As revealed by Western Blot,the expression of STAT3 protein was decreased after MCF-7 cells have been treated with low,medium,and high concentration of oxocrebanine or the positive drug taxol for 48 h(P<0.01).The expression levels of PAK1 and Camk4 proteins aslo showed significant reductions(P<0.05,or P<0.01).Oxocrebanine also decreased the PKA protein in MCF-7 cells compared to the control group(P<0.01).Conclusions:Oxocrebanine,a ligand that binds at the colchicine site of tubulin,perturbs tubulin polymerization and causes mitosis in MCF-7 cells,thus leading to MCF-7 cell death.Oxocrebanine may promote microtubule dynamics through stathmin by inhibiting the expression levels of STAT3,PAK1,Camk4,and PKA proteins in MCF-7 cells.Oxocrebanine interfers with spindle formation,and ultimately causes mitotic catastrophe in MCF-7 cells.

TNF-ɑ调控LRG1促进乳腺癌MCF-7细胞增殖、侵袭和迁移

目的:研究TNF-α对乳腺癌MCF-7细胞中LRG1蛋白表达的调控及其对乳腺癌MCF-7细胞增殖、侵袭和迁移能力的影响及相关分子机制。方法:MTT实验检测不同浓度TNF-α处理后MCF-7细胞活力;EdU实验、Transwell实验和划痕实验分别检测抑制LRG1表达后细胞增殖、侵袭以及迁移能力;Western blot检测细胞内MAPK信号通路中p-p38蛋白表达。结果:低浓度TNF-α处理乳腺癌MCF-7细胞,细胞活力增强;抑制LRG1表达后细胞增殖能力下降,侵袭细胞数、细胞迁移率以及p-p38蛋白表达均下降。结论:TNF-ɑ通过调控LRG1的表达促进乳腺癌MCF-7细胞增殖、侵袭和迁移,这一过程可能通过激活p38MAPK信号通路来实现。

PTK7在口腔鳞癌中的表达分析及其生物学功能研究

目的探讨PTK7在口腔鳞癌(oral squamous cell carcinoma,OSCC)中的表达水平、潜在的生物学功能及其临床意义。方法采用实时荧光PCR(quantitive real-time polymerase chain reaction,qPCR)和Western blot检测PTK7在OSCC细胞系和口腔鳞癌组织标本中的表达情况,利用siRNA干扰技术下调PTK7在HN6和Cal27细胞系中的表达,通过CCK-8实验、平板克隆实验、细胞划痕实验及Transwell实验检测PTK7下调后其对OSCC细胞系增殖、迁移、侵袭的影响;同时采用免疫组织化学染色法检测75例口腔鳞癌组织中PTK7蛋白的表达水平,分析其相关的临床意义。结果qPCR及Western blot结果显示PTK7基因及其编码蛋白在口腔鳞癌细胞系HN6和Cal27中高表达,并在6例新鲜口腔鳞癌标本中的表达高于其配对的癌旁正常组织;下调PTK7的表达可抑制OSCC细胞增殖、迁移和侵袭功能;在75例口腔鳞癌组织中,PTK7的表达水平与OSCC患者的发病年龄、吸烟情况、病理分化程度等相关,其差异有统计学意义(P<0.05)。Kaplan-Meier生存分析发现,高表达PTK7的OSCC患者的预后较差。结论PTK7是口腔鳞癌发生发展过程的潜在癌基因,其表达水平影响OSCC细胞的生物学功能,临床上可根据PTK7表达水平了解口腔鳞癌的特性,PTK7可作为口腔鳞癌预后判定的独立指标。

毛酸浆内酯通过抑制STAT3诱导人乳腺癌MCF-7细胞凋亡

[目的]旨在探讨信号转导和转录激活因子3(STAT3)在毛酸浆内酯(PPB)诱导人乳腺癌MCF-7细胞凋亡中发挥的作用。[方法]采用荧光染色法分析PPB诱导MCF-7细胞凋亡;使用生物信息学方法预测PPB抗乳腺癌的潜在机制;采用噻唑蓝(MTT)法考察STAT3抑制剂S3I-201以及STAT3小干扰RNA(siRNA)对PPB抑制MCF-7细胞生长的作用;采用蛋白免疫印迹(Western Blot)法考察PPB单独处理或STAT3 siRNA预处理后对MCF-7细胞中STAT3、B淋巴细胞瘤-2(Bcl-2)、Bcl-2相关X蛋白(Bax)、半胱氨酸天冬氨酸蛋白酶8(Caspase8)、半胱氨酸天冬氨酸蛋白酶9(Caspase9)、细胞色素c(Cytochrome c)以及多聚ADP核糖聚合酶(PARP)蛋白表达的影响。[结果]MCF-7细胞经PPB作用后凋亡形态特征明显,凋亡比例上升;生物信息学结果显示PPB与乳腺癌疾病的共同靶点STAT3在乳腺癌组织中高表达,单基因GSEA结果提示STAT3高表达与凋亡信号通路呈负相关;Western Blot法检测结果显示PPB能够抑制STAT3的磷酸化;S3I-201抑制剂或siRNA敲降STAT3均能进一步促进PPB抑制MCF-7细胞生长;此外,敲降STAT3进一步增加PPB对促凋亡蛋白Bax、Cytochrome c、裂解的Caspase8(Cleaved-Caspase8)、裂解的Caspase9(Cleaved-Caspase9)以及裂解的PARP(Cleaved-PARP)的促进作用,并增加PPB对抗凋亡蛋白Bcl-2的抑制作用。[结论]PPB通过抑制STAT3诱导人乳腺癌MCF-7细胞凋亡。