肿瘤组织中GPC3、Hepatocyte、CD_(34)检测对AFP阴性肝细胞癌的辅助诊断作用

目的评价肿瘤组织中磷脂酰肌醇蛋白聚糖3(GPC3)、Hepatocyte、CD34蛋白检测对甲胎蛋白(AFP)阴性肝细胞癌(HCC)的辅助诊断作用。方法回顾性分析48例癌细胞AFP阴性的HCC组织及其癌旁组织中GPC3、Hepatocyte、CD34蛋白表达特点。结果 48例HCC及其癌旁组织中GPC3蛋白阳性率分别为91.7%(44/48)、2.1%(1/48),两者比较P<0.01;Hepatocyte蛋白阳性率分别为95.8%(46/48)、100.0%(48/48),两者比较P>0.05;CD34蛋白阳性率分别为100.0%(48/48)、4.2%(2/48),两者比较P<0.01。HCC组织中GPC3与Hepatocyte表达呈正相关(r=0.314,P<0.05)。结论检测肿瘤组织中GPC3、Hepatocyte和CD34蛋白有助于AFP阴性原发性HCC的诊断。

Involvement of PI3K and ERK1/2 pathways in hepatocyte growth factor-induced cholangiocarcinoma cell invasion

AIM:To investigate the role of hepatocyte growth factor(HGF) in cholangiocarcinoma(CCA) cell invasiveness and the mechanisms underlying such cellular responses. METHODS:Effects of HGF on cell invasion and motility were investigated in two human CCA cell lines,HuCCA-1 and KKU-M213,using Transwell in vitro assay.Levels of proteins of interest and their phosphorylated forms were determined by Western blotting.Localization of E-cadherin was analyzed by immunofluorescence staining and visualized under confocal microscope. Activities of matrix degrading enzymes were determined by zymography. RESULTS:Both CCA cell lines expressed higher Met levels than the H69 immortalized cholangiocyte cell line.HGF induced invasion and motility of the cell lines and altered E-cadherin from membrane to cytoplasm localization,but did not affect the levels of secreted matrix metalloproteinase(MMP) -2,MMP-9 andurokinase plasminogen activator,key matrix degrading enzymes involved in cell invasion.Concomitantly,HGF stimulated Akt and extracellular signal-regulated kinase(ERK) 1/2 phosphorylation but with slightly different kinetic profiles in the two cell lines.Inhibition of the phosphoinositide 3-kinase(PI3K) /Akt pathway by the PI3K inhibitor,LY294002,markedly suppressed HGFstimulated invasion of both CCA cell lines,and inhibition of the ERK pathway by U0126 suppressed HGF-induced invasion of the KKU-M213 cell line but had a moderate effect on HuCCA-1 cells. CONCLUSION:These data indicate that HGF promotes CCA cell invasiveness through dys-localization of E-cadherin and induction of cell motility by distinct signaling pathways depending on cell line type.

Human hepatocytes loaded in 3D bioprinting generate mini-liver

BACKGROUND: Because of an increasing discrepancy be-tween the number of potential liver graft recipients and the number of organs available, scientists are trying to create artiifcial liver to mimic normal liver function and therefore, to support the patient’s liver when in dysfunction. 3D printing technique meets this purpose. The present study was to test the feasibility of 3D hydrogel scaffolds for liver engineering. METHODS: We fabricated 3D hydrogel scaffolds with a bioprinter. The biocompatibility of 3D hydrogel scaffolds was tested. Sixty nude mice were randomly divided into four groups, with 15 mice in each group: control, hydrogel, hydro-gel with L02 (cell line HL-7702), and hydrogel with hepatocyte growth factor (HGF). Cells were cultured and deposited in scaffolds which were subsequently engrafted into livers after partial hepatectomy and radiation-induced liver damage (RILD). The engrafted tissues were examined after two weeks. The levels of alanine aminotransferase (ALT), aspartate amino-transferase (AST), albumin, total bilirubin, CYP1A2, CYP2C9, glutathione S-transferase (a-GST), and UDP-glucuronosyl transferase (UGT-2) were compared among the groups. He-matoxylin-eosin (HE) staining and immunohistochemistry of cKit and cytokeratin 18 (CK18) of engrafted tissues were evalu-ated. The survival time of the mice was also compared among the four groups. RESULTS: 3D hydrogel scaffolds did not impact the viability of cells. The levels of ALT, AST, albumin, total bilirubin, CY-P1A2, CYP2C9, a-GST and UGT-2 were signiifcantly improved in mice engrafted with 3D scaffold loaded with L02 compared with those in control and scaffold only (P<0.05). HE staining showed clear liver tissue and immunohistochemistry of cKit&nbsp;and CK18 were positive in the engrafted tissue. Mice treated with 3D scaffold+L02 cells had longer survival time compared with those in control and scaffold only (P<0.05). CONCLUSION: 3D scaffold has the potential of recreating liver tissue and partial liver functions and can be used in the reconstruction of liver tissues.

RIPK3在LPS/D-GalN诱导急性肝衰竭中的作用研究

目的研究受体相互作用蛋白激酶3(receptor-interacting protein kinases 3,RIPK3)在脂多糖(lipopolysaccharide,LPS)/D-氨基半乳糖(D-galactosamine,D-GalN)诱导的急性肝衰竭(acute liver failure,ALF)中的作用。方法体内实验使用SPF级雄性BALB/c小鼠15只,随机分为对照组(Control),模型组(LPS/D-GalN),抑制剂预处理组(GSK872+LPS/D-GalN),每组5只。ALF动物模型采用LPS联合D-GalN腹腔注射的方式制备。药物腹腔注射前1 h,分别以0.1%DMSO和RIPK3特异性拮抗剂GSK872(溶于0.1%DMSO)尾静脉注射进行预处理。肝损伤程度采用血生化检测和肝脏组织学变化来评估;基因mRNA表达采用PCR检测,蛋白表达采用蛋白质印迹和免疫组化分析。结果动物实验结果显示,与正常对照组(Control)相比,模型组(LPS/D-GalN)小鼠肝组织见显著炎症出血坏死性损伤,肝内F4/80+细胞浸润增多,血清ALT和AST水平明显升高(P_(均)<0.01)。同时,肝组织F4/80、Mcp-1、Tnf-α、Il-6、Ripk3和Mlkl mRNA,以及RIPK3蛋白和p-MLKL/MLKL蛋白比值均上调,差异均存在统计学意义(P_(均)<0.05)。与模型组相比,预处理组(GSK872+LPS/D-GalN)小鼠肝脏炎症损伤程度明显减轻,肝内F4/80+细胞浸润明显减少,且血清ALT和AST水平显著下降(P_(均)<0.01)。肝组织F4/80、Mcp-1、Tnf-α、Il-6、Ripk3和Mlkl mRNA,以及RIPK3蛋白和p-MLKL/MLKL蛋白比值下调,差异均有统计学意义(P_(均)<0.05)。结论在LPS/D-GalN联合诱导的小鼠急性肝衰竭模型中,RIPK3抑制剂的应用可能直接通过靶向肝细胞,减少肝细胞的坏死性凋亡,从而减少巨噬细胞浸润,最终改善肝脏炎症状态。这提示RIPK3可能通过对肝细胞坏死性凋亡通路分子的影响促进ALF的发生和发展。

基于内质网应激PERK/eIF2α/ATF4/CHOP通路探讨枳葛口服液含药血清对乙醇诱导BRL-3A损伤的保护作用及机制研究

目的基于内质网应激(Endoplasmic reticulum stress,ERS)信号通路PERK/eIF2α/ATF4/CHOP探讨枳葛口服液含药血清对BRL-3A大鼠肝细胞损伤的保护作用及机制。方法(1)制备含药血清:SD雄性大鼠随机分为3组:枳葛口服液组、美他多辛组、正常组,分别予以枳葛口服液、美他多辛及生理盐水灌胃,连续干预5天,腹主动脉取血制备含药血清。(2)培养正常BRL-3A大鼠肝细胞,用不同浓度乙醇(1.0%、1.5%、2.0%、2.5%、3.0%、5.0%、7.0%、10.0%)干预细胞24 h后用CCK-8法测定各组细胞存活率。(3)BRL-3A大鼠肝细胞分为正常组,模型组,美他多辛组,枳葛口服液低、中、高剂量组(后简称为低剂量组、中剂量组、高剂量组)。24 h后测定各组细胞上清液中γ-谷氨酰转肽酶(GGT)、乳酸脱氢酶(LDH)水平,CCK-8检测BRL-3A细胞存活率,Real-time PCR及Western blot检测各组细胞内PERK/eIF2α/ATF4/CHOP通路相关mRNA及蛋白表达水平。结果(1)不同浓度乙醇(1.0%、1.5%、2.0%、2.5%、3.0%、5.0%、7.0%、10.0%)干预细胞24 h后,细胞存活率随着乙醇浓度的升高呈逐渐下降趋势,当乙醇浓度为5%时,细胞存活率明显下降(P<0.05),故选择乙醇浓度为1.0%、1.5%、2.0%、2.5.0%、3.0%、5.0%进行后续实验。(2)与正常组相比,模型组上清液中GGT、LDH含量显著升高(P<0.05),PERK/eIF2α/ATF4/CHOP通路相关因子mRNA和蛋白的表达显著升高(P<0.05),呈现明显肝损伤状态。(3)与模型组相比,枳葛口服液组及美他多辛组以上指标均呈现不同程度的降低,其中枳葛口服高剂量组效果最显著(P<0.05)。结论枳葛口服液含药血清能够改善乙醇诱导的BRL-3A大鼠肝细胞损伤,其机制可能与抑制内质网应激PERK/eIF2α/ATF4/CHOP信号通路有关。

Amitriptyline inhibits NLRP3 inflammasome activation via the ASM/CE pathway in a cell model of NAFLD

Background:Nonalcoholic fatty liver disease(NAFLD)is a global health concern with the acid sphingomyelinase(ASM)/ceramide(CE)pathway and the NOD-like receptor family,pyrin domain-containing protein 3(NLRP3)inflammasome identified as pivotal players in lipid disorders and inflammation.This study explores the interaction mechanism between the ASM/CE pathway and NLRP3 in NAFLD cell models,aiming to understand the impact of amitriptyline(Ami),an ASM inhibitor,on lipid deposition and hepatocyte injury by regulating the ASM/CE-NLRP3 pathway.Methods:HepG2 and HL-7702 cells were exposed to free fatty acids(FFAs)to establish the NAFLD model.The cells were divided into 5 groups:control group,model group,Ami group,tumor necrosis factoralpha(TNF-α)group,and Ami+TNF-αgroup.Intracellular lipid droplets were visualized using Oil Red O staining,and Western blot analysis quantified ASM,NLRP3,and caspase 1 protein expression.Enzyme linked immunosorbent assay(ELISA)was measured CE and ASM levels,while qRT-PCR assessed mRNA expression.The apoptotic rate was evaluated by flow cytometry(FCM).Results:Following FFAs incubation,significant increases in ASM and CE levels were observed in HepG2 and HL-7702 cells,accompanied by elevated expression of NLRP3,and caspase 1,and IL-1β.TNF-αtreatment further amplified these indicators.Ami demonstrated a reduction in lipid deposition,suppressed ASM/CE pathway activation,downregulated NLRP3 and caspase 1 expression,and improved apoptosis.Additionally,MCC950,a selective inhibitor of the NLRP3,mitigated NLRP3,caspase 1,and IL-1βexpression,alleviating lipid deposition and apoptosis in the NAFLD cell model.Conclusion:The ASM/CE-NLRP3 pathway in NAFLD cells promotes hepatocyte steatosis,inflammation,and cell damage.Ami emerges as a promising therapeutic agent by inhibiting the ASM/CE-NLRP3 pathway,underscoring its potential as a key target for NAFLD treatment.

Efficacy of 1-(N-acetyl-6-aminohexyl)-3-hydroxypyridin-4-one (CM1) in treatment of iron-loaded hepatocyte cultures

Excessive iron is toxic to cells and organelles, where it can generate harmful reactive oxygen species (ROS) resulting in oxidative tissue damage. Liver is the major organ for iron storage and redox active iron in this tissue can cause fibrosis and cirrhosis in β-thalassemia patients. Desferrioxamine (DFO), deferiprone (DFP) and deferasirox (DFX) are clinically approved iron chelators used for the treatment of patients with iron overload, but none of these chelators are completely free of side effects. In this study we report the properties of a new iron chelator 1-(N-acetyl-6-aminohexyl)-3-hydroxypyridin-4-one (CM1). The labile iron pool (LIP) content was measured by using a calcein fluorescence technique and the lipidperoxidation products were quantified using the thiobarbituric acid reactive substances (TBARS) method. The cytotoxicity of CM1 was also examined with the (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. CM1 was demonstrated to reduce iron-induced redox damage and to decrease the levels of the intracellular iron pool in hepatocytes. CM1 is a potentially useful iron-chelating agent which has potential to ameliorate liver iron overload and ROS-induced lipid peroxidation. CM1 is currently under investigation for oral efficacy.

Forkhead box protein O1(FoxO1)regulates lipids metabolism and cell proliferation mediated by insulin and PI3K-Akt-mTOR pathway in goose primary hepatocytes

In order to explore the role of forkhead box protein O1(FoxO1)in the lipid metabolism and cell proliferation,goose primary hepatocytes were isolated and incubated with insulin or PI3K-Akt-mTOR pathway dual inhibitor NVPBEZ235,and then transfected with FoxO1 interference plasmid.The related parameters of lipid metabolism and cell proliferation were measured.The results firstly showed that FoxO1 interference increased the intracellular TG and lipids concentration(P<0.05);and increased the proliferative index(PI),cell DNA synthesis,protein expression of Cyclin D1 in goose primary hepatocytes(P<0.05).Secondly,the co-treatment of insulin and FoxO1 interference increased the mRNA level and protein content of Cyclin D1(P<0.05);however,there was no significant difference between the insulin treatment and the co-treatment of insulin and miR-FoxO1 interference in the intracellular TG and lipids concentration and PI(P>0.05).Lastly,the decrease of intracellular TG and lipids concentration and PI induced by NVP-BEZ235 was up-regulated by FoxO1 interference significantly(P<0.05).In summary,FoxO1 could regulate the lipids metabolism and cell proliferation mediated by PI3K-Akt-mTOR signaling pathway in goose primary hepatocytes.Further investigations are required to highlight the potential role of FoxO1 in the lipid metabolism and cell proliferation mediated by insulin in goose primary hepatocyte.

微囊藻毒素LR对BRL-3A凋亡相关蛋白表达的影响

用蛋白印迹法研究了微囊藻毒素LR(MCLR)暴露时大鼠BRL-3A细胞p53、Bcl-2和Bax的表达情况.结果表明,与对照组相比,各实验组p53和Bax表达均明显升高.除了10nmol/L LR暴露1h实验组外,其它实验组Bcl-2表达均下降.在低浓度组(10nmol/L),随暴露时间的延长,p53和Bax表达逐渐升高,Bcl-2表达逐渐下降,而在中浓度(100nmol/L)和高浓度组(1000nmol/L),蛋白表达与暴露时间的一致性没有低浓度组(10nmol/L)明显.表明p53、Bcl-2和Bax在MCLR诱导的细胞凋亡中可能起重要作用.

山楂黄酮对BRL-3A肝细胞DNA损伤的修复作用及其机制

目的:探讨山楂黄酮对BRL-3A肝细胞DNA损伤的影响及其机制。方法:MTT法检测不同浓度的山楂黄酮对乙醇损伤肝细胞的影响;单细胞凝胶电泳分析细胞DNA的损伤程度并计算Olive尾距;试剂盒检测细胞内超氧化物歧化酶(SOD)、丙二醛(MDA)和谷胱甘肽过氧化物酶(GSH-Px)等生理生化指标;实时定量PCR检测基因SOD的表达变化。结果:0.2,0.4和0.8 mg/mL的山楂黄酮能够显著修复乙醇诱导BRL-3A肝细胞的DNA损伤,这种修复作用与细胞抗氧化指标SOD、MDA和GSH-Px的改善密切相关。结论:山楂黄酮能够通过抗氧化修复肝细胞的DNA损伤,山楂黄酮具备潜在的肝损伤治疗价值。

TGF-β1对大鼠肝细胞系BRL-3A凋亡和细胞周期的影响

目的:研究转化生长因子β1(TGF-β1)对大鼠肝细胞系BRL-3A凋亡和细胞周期的影响.方法:MTT法检测TGF-β1对细胞增殖的影响:将BRL-3A细胞分为6组,分别给予不同浓度的TGF-β1(0、2、4、6、8、10μg/L),检测各组细胞24、36、48h时的增殖活性;进一步将BRL-3A细胞分为TGF-β1处理组和对照组,分别给予和不予TGF-β1(8μg/L),进行如下检测:流式细胞仪检测两组细胞24、36、48h时的凋亡情况和细胞周期分布;实时定量RT-PCR检测两组细胞24、36、48h时CyclinE、Cdk-2、EGF、HGF、Bcl-2、c-Myc、MMP9、NF-κB基因的表达变化.结果:MTT结果显示,各浓度TGF-β1组在24、36、48h时的细胞增殖活性差异无统计学意义;流式细胞仪分析结果显示,TGF-β1处理组24、36、48h时的细胞凋亡率和细胞周期分布与对照组间的差异均无统计学意义;实时定量RT-PCR发现,TGF-β1处理组相对于对照组,CyclinEmRNA、Cdk2mRNA、EGFmRNA在24h时分别下调至0.194±0.103、0.181±0.064、0.634±0.116倍,36h时分别下调至0.379±0.173、0.457±0.123、0.619±0.112倍,48h时分别上调至1.956±0.215、2.17±0.471、7.66±0.437倍;HGFmRNA在24、36、48h时均明显下调,分别至0.152±0.068、0.146±0.053、0.158±0.061倍;Bcl-2mRNA在24、36h时无统计学差异,48h时上调至1.567±0.115倍;c-MycmRNA、MMP9mRNA、NF-κBmRNA在3个时刻均上调,24h时分别至1.742±0.389、3.484±0.411、1.625±0.369倍,36h时分别至2.292±0.361、1.563±0.323、1.486±0.494倍,48h时分别至2.499±0.475、2.233±0.493、3.612±0.364倍.以上基因表达差异均有统计学意义(P<0.05).结论:大鼠肝细胞系BRL-3A对TGF-β1促凋亡和细胞周期阻滞作用的敏感性低下,可能与非Smads途径的激活,NF-κB、Bcl-2、c-Myc、MMP9表达的上调有关.

新蛋白C7orf42促进大鼠肝细胞BRL-3A增殖

目的探讨未知功能蛋白C7orf42对体外培养的大鼠肝细胞BRL-3A增殖的影响。方法基因干涉下调C7orf42表达后,用MTT、Ed U掺入法检测C7orf42对BRL-3A细胞增殖的影响,流式细胞术检测细胞周期进程以及Reat-time PCR和Western blotting检测细胞增殖相关基因表达。结果 MTT法检测表明,转染C7orf42干涉片段后48h,干涉组比阴性对照组细胞活力降低11%(P<0.05);Ed U掺入法检测表明,实验组的Ed U阳性细胞比率比对照组降低了13%(P<0.05);流式细胞术检测表明,干涉组比阴性对照组S+G2/M期的细胞数降低12%(P<0.05);Reat-time PCR检测表明,干涉C7orf42表达后细胞增殖相关基因JUN、CCND1、MYC和CCNA2的表达分别下调26%、31%、37%和14%(P<0.05);Western blotting检测表明,干涉C7orf42表达后细胞增殖相关蛋白JUN、CCND1、MYC和CCNA2的表达分别下调59%、54%、18%和27%(P<0.05)。结论 C7orf42可能通过上调细胞增殖相关蛋白JUN、CCND1、MYC和CCNA2的表达,促进体外培养的大鼠肝细胞BRL-3A增殖。

人胰岛素抑制大鼠肝细胞系BRL-3A凋亡且促增殖

目的探讨人胰岛素对体外培养的大鼠肝细胞BRL-3A增殖和凋亡的影响。方法人胰岛素作用于BRL-3A后,用MTT法检测细胞活力,流式细胞仪检测细胞凋亡和细胞周期,qRT-PCR检测相关基因的表达。结果人胰岛素呈剂量依赖性地促进BRL-3A增殖(P<0.05或P<0.01);500 nmol/L人胰岛素处理3 d后,处于G0/G1期的细胞比例显著下降(P<0.05);促凋亡基因BAX表达下调(P<0.05),而促细胞增殖基因CCNA2表达上调(P<0.05)。结论人胰岛素可通过下调BAX表达和上调CCNA2表达,从而抑制大鼠肝细胞BRL-3A凋亡,促进细胞增殖。

H2O2诱导BRL-3A细胞氧化损伤的研究

目的:本试验研究不同浓度过氧化氢(H2O2)对BRL-3A细胞氧化应激损伤的影响。方法:采用不同浓度H2O2处理BRL-3A细胞,MTT法检测细胞活力,试剂盒法检测蛋白质羰基含量和超氧化物歧化酶(SOD)、过氧化物酶(POD)、谷胱甘肽过氧化物酶(GSH-Px)及过氧化氢酶(CAT)活性,流式细胞术检测活性氧(ROS)和细胞凋亡率。结果:实验结果表明,150~500μmol·L-1H2O2处理可显著降低细胞活力和SOD、POD及CAT活性(P<0.01)。与对照相比,150~500μmol·L-1 H2O2处理显著提高活性氧和蛋白质羰基含量以及细胞凋亡率(P<0.01),并呈浓度明显的剂量依赖性。结论:150~500μmol·L-1 H2O2处理可导致BRL-3A细胞发生氧化应激损伤,且损伤程度与H2O2处理浓度呈现明显的相关性。研究结果为今后深入开展动物肝脏损伤和抗损伤保护机制的研究奠定基础。

β_3受体激动剂BRL-37344促进大鼠心力衰竭及可能的作用机制

目的观察β3肾上腺素能受体激动剂(BRL37344)对血浆TNFα、AngⅡ和ET1水平及心肌重构的影响。方法用异丙肾上腺素(isoproterenol,ISO)诱导心力衰竭大鼠模型。随机分为心衰组(CHF)和BRL组,BRL组给予BRL37344尾静脉注射,同时另设对照组。结果2和6周时CHF组和BRL组大鼠血浆TNFα、AngⅡ、ET1均明显高于对照组(P<0.01),相同时间点BRL组ET1水平均高于CHF组(P<0.01),6周时BRL组AngⅡ也明显高于CHF组(P<0.01)。6周时BRL组上述指标均高于2周时水平(P<0.01),而CHF组只有TNFα高于2周时水平(P<0.05)。心衰大鼠心肌细胞破坏和胶原纤维组织增生明显,β3受体蛋白在心衰和应用BRL37344的大鼠心肌表达很明显。结论BRL37344能升高心衰大鼠血浆TNFα、AngⅡ和ET1含量,并且能促进左室重构,使心衰恶化。

丙烯酰胺诱导BRL-3A鼠肝细胞中环氧合酶-2表达

环氧合酶-2(COX-2)在肿瘤的发生、发展和侵袭过程中发挥了重要的作用。丙烯酰胺是存在于环境和食品中的一种潜在致癌物质,但目前鲜见丙烯酰胺能否诱导正常肝细胞中COX-2表达的研究报道。本研究采用蛋白质免疫印迹检测丙烯酰胺对BRL-3A鼠正常肝细胞中COX-2表达的诱导作用,发现丙烯酰胺能够以浓度依赖和时间依赖的方式诱导BRL-3A大鼠正常肝细胞中COX-2表达,表明丙烯酰胺有可能通过诱导正常肝细胞中COX-2表达而参与肿瘤的发生和发展过程。

地塞米松对大鼠肝细胞BRL-3A增殖和凋亡的影响

目的探讨地塞米松对体外培养大鼠肝细胞BRL-3A增殖和凋亡的影响。方法用不同浓度的地塞米松处理BRL-3A细胞,于12、24、48、72、120 h后用MTT检测地塞米松对BRL-3A细胞活性的影响,同时分别用Annexin V-FITC双染法、PI单染色法、实时定量-聚合酶链反应(Real-time PCR)等方法检测地塞米松对BRL-3A细胞周期和凋亡的影响。结果 MTT检测表明,地塞米松能够抑制BRL-3A细胞的活性;Annexin V-FITC双染法分析显示,地塞米松具有显著促进BRL-3A细胞凋亡的效果;PI单染色法检测细胞周期分布情况表明,地塞米松处理后的细胞与对照组相比增殖能力减弱;用Real-time PCR检测促细胞凋亡基因Caspase-3、Caspase-8、Caspase-9和促增殖基因Ccnd1和Jun的mRNA表达情况,结果显示,用地塞米松处理后的细胞中Caspase-3、Caspase-8和Caspase-9均表达上调,而Ccnd1和Jun均表达下调,说明地塞米松能促进BRL-3A细胞的凋亡。结论地塞米松可以促进BRL-3A细胞的凋亡,并抑制其增殖。

棕榈酸对BRL-3A细胞胰岛素抵抗和脂代谢的影响

[目的]分析不同浓度棕榈酸诱导对BRL-3A细胞(大鼠肝脏间质细胞)胰岛素抵抗和脂代谢的影响,为研究胰岛素抵抗发生的生物化学机制提供肝细胞模型。[方法]采用不同浓度(0、0.05、0.10、0.15、0.20和0.25 mmol·L^(-1))棕榈酸处理BRL-3A细胞,分别检测细胞活力、细胞死亡率、甘油三酯含量和葡萄糖消耗量; RT-qPCR法检测脂代谢相关基因表达;免疫印迹法检测胰岛素抵抗相关蛋白表达。[结果]与对照组相比,0.25 mmol·L^(-1)棕榈酸处理12～48 h显著降低BRL-3A细胞活力,并显著增加其死亡率。0.15～0.25 mmol·L^(-1)棕榈酸处理显著增加BRL-3A细胞中脂滴的堆积及甘油三酯含量,显著降低葡萄糖消耗量。0.15～0.25 mmol·L^(-1)棕榈酸处理显著增加脂代谢合成相关基因表达,显著降低脂代谢分解相关基因和胰岛素抵抗相关蛋白的表达。[结论]0.15～0.25 mmol·L^(-1)棕榈酸处理可诱发BRL-3A细胞发生脂代谢紊乱和胰岛素抵抗。考虑到剂量效应和细胞毒性,0.20 mmol·L^(-1)棕榈酸处理BRL-3A细胞24 h可作为后续探讨胰岛素抵抗机制相关研究理想模型构建的最佳条件。

肾素-血管紧张素系统2条通路在油酸致大鼠BRL-3A细胞非酒精性脂肪肝中的作用

[目的]通过建立油酸诱导的大鼠肝脏间质BRL-3A细胞非酒精性脂肪肝(NAFLD)损伤模型,探讨BRL-3A细胞中RAS的ACE/AngⅡ/AT1R和ACE2/Ang-1-7/Mas这2条通路相互负向调节与NAFLD细胞损伤的关系。[方法]采用不同浓度油酸(0.025、0.05、0.1和0.2 mmol·L^-1)处理BRL-3A细胞24 h,通过检测细胞活力、细胞内甘油三酯(TG)含量、丙氨酸氨基转移酶(ALT)活性、天门冬氨酸氨基转移酶(AST)活性以及油红染色确立NAFLD细胞模型条件,然后选取低、中、高3个浓度(0.025、0.1和0.2 mmol·L^-1)油酸作用于细胞24 h,用ELISA法检测细胞上清液中血管紧张素Ⅱ(AngⅡ)、血管紧张素1-7(Ang1-7)水平;Western blot分析细胞内血管紧张素转化酶(ACE)、血管紧张素转化酶2(ACE2)、血管紧张素Ⅱ受体1(AT1R)、Mas受体(MasR)蛋白水平;斯皮尔曼相关分析法分析油酸浓度与细胞内ACE、ACE2表达水平的相关性。[结果]1)用0.1 mmol·L^-1油酸处理BRL-3A细胞24 h,成功建立BRL-3A细胞NAFLD模型。2)油酸处理24 h后,BRL-3A细胞出现脂滴沉积,在0.025 mmol·L^-1油酸(低浓度)组,ACE2、MasR表达水平和Ang1-7水平有升高趋势,AngⅡ水平与AT1R表达水平下降,ACE/ACE2值下降;0.1 mmol·L^-1油酸(中浓度)组ACE、AT1R表达水平显著升高,其他RAS成员变化不明显;0.2 mmol·L^-1油酸(高浓度)组,ACE2、MasR表达水平和Ang1-7水平下降,AngⅡ水平和ACE、AT1R表达水平及ACE/ACE2值升高。3)斯皮尔曼相关分析显示,油酸浓度、血液相关生化指标(TG含量、AST和ALT活性)和脂滴数及脂滴面积与ACE2表达水平和Ang1-7水平负相关,而与ACE表达水平和AngⅡ水平正相关。[结论]BRL-3A细胞中的2条轴共同参与了油酸致BRL-3A细胞NAFLD损伤的发生和发展过程。低浓度油酸时,ACE2介导的Ang1-7/MasR通路占优势;高浓度油酸处理细胞损伤加重,ACE介导的AngⅡ/AT1R通路占主导地位。ACE2与油酸致细胞炎性损伤的程度呈显著负相关关系。