核因子-κB在脂多糖诱导的大鼠胰腺腺泡细胞AR42J炎性效应中的作用

目的探讨核因子-κB（NF—κB）在急性胰腺炎体外模型中的作用。方法以10mg／L脂多糖刺激AR42J细胞构建急性胰腺炎的体外模型，设2h、6h、12h、18h和24h共5个时间点，每时间点设3个复孔，逆转录-多聚酶链反应（RT—PCR）半定量法观察细胞间黏附分子-1（ICAM-1）和NF—KBp65亚单位mRNA表达的改变；链酶亲和素-生物素-过氧化物酶复合物法（SABC）检测p65蛋白在AR42J细胞中的表达；人工碘比色法观察培养液上清中淀粉酶的改变。结果脂多糖刺激后，AR42J细胞以时间依赖方式上调ICAM-1 mRNA和p65 mRNA的表达，24h达最高值；二者之间具有直线相关性（P〈0．01），同时P65蛋白亦呈时间依赖方式表达增强，24h表达最强；各组间淀粉酶无明显改变（P〉0．05）。结论在脂多糖诱导的胰腺腺泡细胞AR42J炎性效应中，NF—κB调控致炎细胞因子ICAM-1的表达。     

套细胞淋巴瘤细胞Toll样受体9的表达及意义

目的观察套细胞淋巴瘤细胞Toll样受体(TLR)9的表达及意义。方法采用PCR检测TLR9基因的表达,采用流式细胞术检测TLR9蛋白的表达,采用免疫组化检测淋巴瘤患者淋巴结TLR的表达。采用Annexin V/PI双染检测CpG诱导套细胞淋巴瘤细胞的凋亡情况。结果在套细胞淋巴瘤细胞系,TLR9基因水平和蛋白水平均高表达。套细胞淋巴瘤患者的淋巴结TLR9也有明显的表达。CpG-B刺激套细胞淋巴瘤细胞系后凋亡比例明显上升,并且具有时间和浓度依赖性。结论 TLR9在套细胞淋巴瘤细胞系高表达,CpG-B能够诱导套细胞淋巴瘤细胞凋亡。     

乙型肝炎病毒转染及脂多糖刺激对HepG2细胞Toll样受体2和4表达的影响

目的探讨乙型肝炎病毒(HBV)转染对HepG2细胞表面Toll样受体(TLR)表达的影响及脂多糖(LPS)加重HBV转染致肝细胞损伤是否存在直接作用,进一步探讨乙型肝炎发病及重型化的发生机制。方法以不同浓度的LPS刺激HepG2细胞、HepG2．2．15细胞(转染HBV全基因组的HepG2细胞),并以免疫细胞化学方法检测HepG2细胞及HepG2．2．15细胞表面TLR 2、4蛋白质表达情况,以逆转录聚合酶链反应(RT-PCR)检测TLR2、4 mRNA表达情况,用Abbot试剂检测HepG2．2．15细胞HgsAg和HgeAg表达情况,用流式细胞仪观察细胞生长周期及细胞凋亡情况。结果HepG2、HepG2．2．15细胞膜上均有TLR2、4蛋白质表达,免疫细胞化学染色在未加LPS及各浓度LPS刺激细胞均可见细胞膜有棕褐色着色,且随着LPS浓度增加,其着色强度增加;对0mg/L及10mg/L LPS诱导HepG2、HepG2．2．15细胞RNA进行RT-PCR扩增,其产物行10g/L琼脂糖凝胶电泳均可见特异性条带,且10mg/L LPS诱导细胞TLR2和TLR4与分子量标准品的吸光度值比值明显高于0mg/L LPS诱导细胞扩增产物,分别为306．63±6．18对519．84±9．15和700．54±13．56对1116．62±37．67,F值分别为740．58和426．07,P值分别为0．01和0．02;流式细胞仪检测细胞周期发现HepG2绌胞及未经LPS诱导的HepG2．2．15未发生凋亡,各浓度LPS诱导的HepG2．2．15细胞均有细胞凋亡发生,且细胞凋亡率随着LPS浓度增加上升。结论LPS可能通过其与肝细胞膜上的TLR结合,而参与HBV转染后肝细胞损害及肝脏炎症重型化的发病机制。     

大鼠星形胶质细胞Toll样受体表达谱

目的探索Toll样受体4(TLR4)表达定位,揭示星形胶质细胞(AS)参与阿尔茨海默病(AD)炎症机制的可能分子机制。方法取新生1³ d的SD大鼠皮层进行星形胶质细胞的培养,传代纯化。细胞免疫荧光双标法鉴定传代后的AS及其纯度。实时PCR检测正常AS中TLRs表达谱。细胞免疫荧光双标法鉴定TLR4在AS的表达定位。结果传代培养可以纯化AS;AS表达TLR13 d的SD大鼠皮层进行星形胶质细胞的培养,传代纯化。细胞免疫荧光双标法鉴定传代后的AS及其纯度。实时PCR检测正常AS中TLRs表达谱。细胞免疫荧光双标法鉴定TLR4在AS的表达定位。结果传代培养可以纯化AS;AS表达TLR1¹1,但不同的TLRs表达量不同,其中TLR4表达水平相对较高,并且TLR4表达定位于胞膜和胞质。结论 AS参与AD炎症机制的可能分子机制。     

核因子-κB在脂多糖诱导的大鼠胰腺腺泡细胞AR42J炎性效应中的作用

目的 探讨核因子-κB(NF-κB)在急性胰腺炎体外模型中的作用.方法 以10 mg/L脂多糖刺激AR42J细胞构建急性胰腺炎的体外模型,设2 h、6 h、12 h、18 h和24 h共5个时间点,每时间点设3个复孔,逆转录-多聚酶链反应(RT-PCR)半定量法观察细胞间黏附分子-1(ICAM-1)和NF-κB p65亚单位mRNA表达的改变;链酶亲和素-生物素-过氧化物酶复合物法(SABC)检测p65蛋白在AR42J细胞中的表达;人工碘比色法观察培养液上清中淀粉酶的改变.结果 脂多糖刺激后,AR42J细胞以时间依赖方式上调ICAM-1 mRNA和p65 mRNA的表达,24 h达最高值;二者之间具有直线相关性(P＜0.01),同时p65蛋白亦呈时间依赖方式表达增强,24 h表达最强;各组间淀粉酶无明显改变(P＞0.05).结论 在脂多糖诱导的胰腺腺泡细胞AR42J炎性效应中,NF-κB调控致炎细胞因子ICAM-1的表达.     

不同胆汁酸诱导AR42J细胞凋亡与坏死的作用

目的:探讨7种不同胆汁酸对AR42J胰腺腺泡细胞的损伤作用,检测在各种胆汁酸作用下胰腺腺泡细胞的存活率和凋亡/坏死的改变.方法:以大鼠AR42J胰腺腺泡细胞系为研究对象,应用MTT法检测7种不同胆汁酸对细胞存活率的影响和剂量与时间依赖性,采用光学显微镜和荧光显微镜观察细胞形态学改变与凋亡/坏死的变化,流式细胞术AV/PI双染法检测细胞的凋亡/坏死卒.结果:CA,GCA和GDCA在0.1-1.0 mmol/L内对AR42J细胞不具有损伤作用;而DCA,CDCA和LCA分别从0.3 mmol/L开始,TDCA从0.4 mmol/L开始,呈剂量依赖性对AR42J细胞产生损伤作用.0.8 mmol/L CA组细胞凋亡率与坏死率同CON组无明显区别(1.2%VS'0.9%;1.0%VS 1.0%,均P>0.05);0.4 mmol/LDCA组细胞凋亡率和坏死率分别为45.2%和8.9%:0.8 mmol/L DCA组细胞凋亡率和坏死率分别为18.6%和45.4%.结论:7种胆汁酸对AR42J细胞的损伤作用不同,主要表现为凋亡或/和坏死,同剂量相关.     

Toll样受体及内毒素信号传导研究进展

1997年以来 ,《Ｎａｔｕｒｅ》(《自然》杂志 )发表人类Ｔｏｌｌ蛋白[1]和《Ｓｃｉｅｎｃｅ》(《科学》杂志 )发表Ｔｏｌｌ样受体 (Ｔｏｌｌ ｌｉｋｅｒｅｃｅｐｔｏｒ ,ＴＬＲ)及其生物学作用后[2 ] ,ＴＬＲ研究开始成为热点。研究揭示了ＴＬＲ是内毒素信号传导链中致病的关键环节。本文着重介绍ＴＬＲ4及其在内毒素信号传导中的作用 ,简略介绍与ＬＰＳ致病的其它相关分子 ,并对未来研究阻断内毒素致病的方法和途径提出设想。一、脂多糖 (ＬＰＳ)与血液中相关结合蛋白目前认为 ,革兰阴性细菌进行活体繁殖或崩解时可以释放内毒素或ＬＰＳ ,…     

Toll样受体与细胞迁移

敏感性侵袭病原体侵入机体,生殖系编码模式识别受体识别病原体,由此启动先天免疫系统。Toll样受体家族（toll-like receptors,TLR）是在免疫系统特异性识别微生物病原体抗原中发挥重要调控作用的受体家族。TLR表达于许多的免疫和非免疫细胞,参与多种细胞迁移,与细胞的迁移性运动密切相关。活化TLR诱导产生一系列的炎症介质包括细胞因子、趋化因子等从而产生强有力的生物学效应。TLR最突出的生物学功能一方面促进细胞因子或趋化因子的合成与释放,引发炎症反应或细胞效应,另一方面是促进抗原递呈细胞的成熟,从而诱导机体的获得性免疫反应,因而是机体介导天然免疫转向获得性免疫的桥梁。     

Toll样受体与细胞迁移

敏感性侵袭病原体侵入机体,生殖系编码模式识别受体识别病原体,由此启动先天免疫系统.Toll样受体家族(toll-like receptors,TLR)是在免疫系统特异性识别微生物病原体抗原中发挥重要调控作用的受体家族.TLR表达于许多的免疫和非免疫细胞,参与多种细胞迁移,与细胞的迁移性运动密切相关.活化TLR诱导产生一...     

溃疡性结肠炎中Toll样受体的变化

溃疡性结肠炎(ulcerative colitis,UC)是一种反复发作的非特异性肠道黏膜慢性炎症性疾病.其病变主要累及直肠和结肠黏膜层,以溃疡为主.溃疡性结肠炎近年来在我国的病例报道有快速增加趋势[1],已成为临床常见的难治性疾病.其发病机制复杂,目前认为UC可能与一系列的遗传易感基因、环境因素及免疫系统的相互作用有关[2].肠道黏膜免疫系统异常反应导致的炎性反应在炎症性肠病的发病中起重要作用已被广大学者所公认.     

大黄素对脱氧胆酸诱导的AR42J细胞损伤的调节

目的:研究大黄素(Emodin)对脱氧胆酸(deoxy-cholicacid,DCA)诱导的胰腺腺泡细胞损伤的调节作用.方法:以大鼠AR42J胰腺腺泡系为研究对象,分为5组,分别为CON组、0.4mmol/LDCA刺激组、0.4mmol/LDCA刺激+Emodin(20mg/L)干预组、0.8mmol/LDCA刺激组、0.8mmol/LDCA刺激+Emodin(20mg/L)干预组.利用流式细胞术AV/PI双染法检测各组细胞凋亡/坏死率,提取细胞浆蛋白,并分别检测各组细胞培养液上清与细胞浆淀粉酶的活性.结果:0.4mmol/LDCA诱导AR42J胰腺腺泡细胞损伤以凋亡为主,0.8mmol/LDCA诱导AR42J细胞损伤则以坏死为主.20μmol/LEmodin可以明显减少0.4mmol/LDCA诱导的AR42J胰腺腺泡细胞的晚期凋亡(27.9%vs34.1%),并明显降低0.8mmol/LDCA诱导的AR42J细胞坏死(38.1%vs45.4%).大黄素对DCA诱导下AR42J胰腺腺泡细胞培养液上清及细胞浆淀粉酶活性均没有明显变化.结论:Emodin对胆汁酸诱导的胰腺腺泡细胞损伤有一定的保护性作用,对细胞淀粉酶的合成与分泌功能没有明显影响.     

Melatonin induces calcium release from CCK‐8‐ and thapsigargin‐sensitive cytosolic stores in pancreatic AR42J cells

Abstract: Melatonin is produced following circadian rhythm with high levels being released at night and has been implicated in the regulation of physiological processes in major tissues, including the pancreas. The aim of our study was to examine the effects of melatonin on intracellular free Ca²⁺ concentration ([Ca²⁺]_c) in AR42J pancreatic cells. Our results show that stimulation of cells with 1 nm cholecystokinin (CCK)‐8 led to a transient increase in [Ca²⁺]_c followed by a decrease towards a value close to the prestimulation level. Melatonin (at the concentrations 1, 10, 100 μm and 1 mm ) induced changes in [Ca²⁺]_c that consisted of single or short lasting spikes in the form of oscillations or slow transient increases followed by a slow reduction towards a value close to the resting level. Depletion of intracellular Ca²⁺ stores by stimulation of cells with 1 nm CCK‐8 or 1 μm thapsigargin (Tps) blocked Ca²⁺ responses evoked by melatonin in the majority of cells. Conversely, prior stimulation of cells with 1 mm melatonin in the absence of extracellular Ca²⁺ inhibited Ca²⁺ mobilization in response to a secondary application of CCK‐8 or Tps. In summary, our results show that melatonin releases Ca²⁺ from intracellular stores and can therefore modulate the responses of the pancreas to CCK‐8. The source for Ca²⁺ mobilization most probably is the endoplasmic reticulum. These data raise the possibility that melatonin also involves Ca²⁺ signalling, in addition to other intracellular messengers, to modulate cellular function.     

miR-29a up-regulation in AR42J cells contributes to apoptosis via targeting TNFRSF1A gene

AIM: To investigate the expression of mi R-29 a in rat acute pancreatitis and its functional role in AR42 J cell apoptosis.METHODS: Twelve SD rats were divided into a control group and an acute edematous pancreatitis(AEP) group randomly. AEP was induced by intraperitoneal injection of L-arginine(150 mg/kg) in the AEP group and equal volume of 0.9% Na Cl was injected in the control group. The apoptosis of acinar cells in pancreatic tissue was determined by TUNEL assay. mi RNA chip assay was performed to examine the expression of mi RNAs in two groups. Besides, to further explore the role of mi R-29 a in apoptosis in vitro, recombinant rat TNF-α(50 ng/m L) was administered to treat the rat pancreatic acinar cell line AR42 J for inducing AR42 J cell apoptosis. Quantitative real-time PCR(q RT-PCR) was adopted to measure mi R-29 a expression. Then, mi RNA mimic, mi RNA antisense oligonucleotide(AMO) and control vector were used to transfect AR42 J cells. The expression of mi R-29 a was confirmed by q RT-PCR andthe apoptosis rate of AR42 J cells was detected by flow cytometry analysis. Western blot was used to detect the expression of activated caspase3. Moreover, we used bioinformatics software and luciferase assay to test whether TNFRSF1 A was the target gene of mi R-29 a. After transfection, q RT-PCR and Western blot was used to detect the expression of TNFRSF1 A in AR42 J cells after transfection.RESULTS: The expression of mi R-29 a was much higher in the AEP group compared with the control group as displayed by the mi RNA chip assay. After inducing apoptosis of AR42 J cells in vitro, the expression of mi R-29 a was significantly increased by 1.49 ± 0.04 times in comparison with the control group. As revealed by q RT-PCR assay, the expression of mi R-29 a was 2.68 ± 0.56 times higher in the mi R-29 a mimic group relative to the control vector group, accompanied with an obviously increased acinar cell apoptosis rate(42.83 ± 1.25 vs 24.97 ± 0.15, P 0.05). Moreover, the expression of mi R-29 a in the mi RNA AMO group was 0.46 ± 0.05 times lower than the control vector group, and the cell apoptosis rate was much lower accordingly(17.27 ± 1.36 vs 24.97 ± 0.15, P 0.05). The results of bioinformatics software and luciferase assay showed that TNFRSF1 A might be a target gene of mi R-29 a. TNFRSF1 A expression was up-regulated in the mi R-29 a mimic group, while the mi R-29 a AMO group showed the reverse trend.CONCLUSION: mi R-29 a might promote the apoptosis of AR42 J cells via up-regulating the expression of its target gene TNFRSF1 A.     

细胞表面Toll样受体4在小鼠急性坏死性胰腺炎中的作用

目的 探索髓系细胞(中性粒细胞、血小板)及内皮细胞表面Toll样受体4(toll-like receptor 4,TLR4)表达在小鼠急性坏死性胰腺炎(ANP)中性粒细胞招募中的作用.方法 将C3H/He-J和C3H/He-N小鼠通过骨髓移植的方法制作髓系细胞TLR4-/一和内皮细胞TLR4+/+、髓系细胞TLR4+/+和内皮细胞TLR4+/+、髓系细胞TLR4+/+和内皮细胞TLR4-/-、髓系细胞TLR4-/-和内皮细胞TLR4-/-4组嵌入体或纯合体小鼠,另设1个对照组.腹腔注射蛙皮素、尾静脉注射脂多糖复制ANP模型.榆测血清淀粉酶含量,行胰腺病理检查、胰腺组织萘酚AS-D氯乙酸脂酶染色计数、髓过氧化物酶(MPO)活性测定、TLR4蛋白表达检测及RT-PCR检测外周血粒细胞TLR4 mRNA表达.结果 各实验组小鼠血清淀粉酶均较对照组显著升高,但组间无显著性差异.4个实验组胰腺病理分值分别为5.52±1.21、5.18±1.02、2.03±0.82、1.92±0.78;胰腺MPO水平分别为(1.834±0.170)U/g、(2.596±0.138)U/g、(0.367±0.018)U/g、(0.202±0.018)U/g;AS-D计数分别为(66.88±2.17)个、(75.00±2.43)个、(21.50±2.38)个、(20.00±2.19)个;外周血粒细胞TLR4 mRNA表达量分别为0.037±1.047E-2、1.489±8.084 E-2、1.470±5.210E-2、0.017±6.668 E-3;内皮细胞TLR4+/+的2组小鼠胰腺内血管内皮细胞TLR4蛋白强阳性表达,内皮细胞TLR4-/-的2组不表达.内皮细胞TLR4+/+的2组小鼠的胰腺损伤、MPO活性、AS-D计数及TLR4蛋白表达均显著高于内皮细胞TLR4-/-的2组小鼠.结论 内皮细胞而非外周血粒细胞在ANP中性粒细胞聚集及病理损伤中起关键作用.     

大鼠急性坏死性胰腺炎肺组织中Toll样受体2、4的表达

目的研究急性坏死性胰腺炎（ANP）肺组织中Toll样受体2、4（TLR2、4）mRNA的表达及其意义。方法采用逆行胰胆管注射牛磺胆酸钠（TAC）诱导ANP肺损伤动物模型，并分为假手术组、胰腺炎组和氯喹阻断组。计算肺组织学分值和肺损伤指数以评价肺损伤程度，荧光实时定量-PCR方法检测不同组不同时间点肺组织TLR2和TLR4 mRNA表达变化。结果与假手术组比较，胰腺炎组大鼠3h时肺组织TLR2、4mRNA表达开始增高，12h时达到峰值（P〈0.05），同时，肺损伤加重，肺组织TNF -α浓度升高，NO浓度逐渐降低；给予氯喹治疗后，TLR2、4mRNA表达降低，肺损伤程度减轻，肺组织TNF-α浓度降低，NO浓度显著升高。结论ANP时，肺组织内TLR2和TLR4的基因表达上调，其升高同肺组织损伤呈正相关，在ANP肺损伤的发生、发展中起一定作用。     

The roles of toll like receptor 3, 7 and 8 in allergic rhinitis pathogenesis

Allergic rhinitis, as an allergic and nasal hypersensitivity disease, is associated with the inflammation of nasal mucosa. It appears that innate immune receptors are the important risk factors in the pathogenesis of the inflammatory disease. Toll-like receptors (TLRs) are the most important receptors of innate immunity; their crucial roles in the recognition of allergens and subsequently pathogenesis of allergic diseases have been evaluated recently. TLR3, 7 and 8 are the intracellular members of the innate immune receptors and recognize intracellular single and double strand RNAs. This review article collected the investigations regarding the roles of TLR3, 7 and 8 in the allergic rhinitis pathogenesis.     

Toll样受体、CD4+CD25+调节性T细胞与支气管哮喘的关系

Toll样受体（TLR）是机体识别环境中各种微生物的主要受体，是介导天然免疫和获得性免疫的桥梁。支气管哮喘（哮喘）的发病是环境和基因相互作用的结果，TLR与哮喘有着十分密切的关系。近年来，人们逐渐认识到Th1／Th2理论并不能充分阐明哮喘的发病机制。随着对哮喘的深入研究，CD4^＋CD25^＋调节性T细胞凸现其冰山一角。本文就近年来对TLR、CD4^＋CD25^＋调节性T细胞和哮喘关系的研究进展作一综述。