褪黑素对PDGF诱导的肝星状细胞中JAK2/STAT3信号通路的影响

目的探讨褪黑素对血小板衍生生长因子(PDGF)诱导的肝星状细胞-T6(HSC-T6)JAK2/STAT3信号通路的影响。方法将HSC-T6细胞分为6组:对照组、模型组、实验组(褪黑素1 nmol·L^-1、1μmol·L^-1、0.1 mmol·L^-1)、抑制剂组(AG490为JAK2/STAT3通路的抑制剂),MTT实验检测褪黑素对PDGF激活的HSC-T6细胞增殖的影响;免疫组化和Western blot检测褪黑素HSC-T6细胞中p-JAK2、p-STAT3蛋白的表达。结果与对照组比较,PDGF能明显激活HSC-T6细胞增殖,明显上调HSC-T6细胞中p-JAK2、p-STAT3的表达;与模型组比较,褪黑素和抑制剂均可抑制PDGF激活的HSC-T6细胞增殖,显著下调p-JAK2、p-STAT3的表达。结论褪黑素可抑制PDGF诱导的HSC-T6的活化与增殖,其机制可能与抑制JAK2/STAT3信号通路有关。     

Acacetin restrains the malignancy of esophageal squamous carcinoma cells via regulating JAK2/STAT3 pathway

Acacetin is a natural flavonoid compound found in diverse plants, which has strong anti-inflammatory and anti-cancer activities. This work aimed at investigating how acacetin functions on esophageal squamous carcinoma cells. In this work, esophageal squamous carcinoma cell lines were subjected to increasing doses of acacetin, and the proliferative, migrative, invasive and apoptotic phenotypes were evaluated by a series of in vitro experiments. Genes related to acacetin and esophageal cancer were predicted by bioinformatics analysis. The levels of apoptosis-relevant proteins and JAK2/STAT3 pathway-relevant proteins in esophageal squamous carcinoma cells were probed by Western blot. It was revealed that acacetin could block the growth and aggressiveness of TE-1 and TE-10 cells and promote the apoptosis. Acacetin treatment induced bax's expression and repressed bcl-2's expression. Notably, acacetin inhibits JAK2/STAT3 pathway in esophageal squamous carcinoma cells. In summary, acacetin inhibits the malignant progression of esophageal squamous carcinoma via restraining JAK2/STAT3 signaling.     

神经干细胞增殖分化的JAK/STAT与Notch信号通路串话机制

JAK／STAT通路参与细胞的增殖、分化和凋亡等过程,近年来的研究显示,其在胚胎发育、成年个体脑肿瘤、脑缺血及损伤后脑内神经干细胞增殖过程中发挥重要作用。Notch介导的信号通路广泛存在于所有已知动物细胞中,是调控神经干细胞增殖、分化的经典信号通路。两条通路形成一个整体网络调控着神经干细胞增殖分化,本文综述Notch通路与JAIL／STAT通路在神经干细胞增殖过程中各组分的相互联系,旨在从网络药理学角度为脑缺血后神经保护及调控神经干细胞增殖药物的开发提供基础理论支持。     

Janus激酶-信号转导子与转录激活子信号通路在硫化氢后处理离体缺血再灌注大鼠心肌中的作用

目的 探讨Janus激酶-信号转导子与转录激活子(JAK2/STAT3)信号通路在硫化氢后处理(H2S)减轻离体大鼠心脏缺血/再灌注(I/R)损伤的作用.方法 应用Langendorff离体心脏灌流装置、通过停灌30 min/复灌60 min的方法建立SD大鼠I/R模型.按照处理及再灌注成分分为持续灌注对照组,I/R组...     

Expression of pro‐inflammatory cytokines and mediators induced by Bisphenol A via ERK‐NFκB and JAK1/2‐STAT3 pathways in macrophages

Macrophages not only play an important role in the innate immune response but also participate in many inflammatory and infectious diseases including asthma, diabetes, obesity, cardiovascular diseases, and cancers. Bisphenol A (BPA) is the most commonly used component for plastic products. However, BPA is an endocrine disruptor for mammals and participates in several inflammatory and infectious diseases. Up until now, there are no researches demonstrated the potential role of BPA in macrophage activation and its relative mechanism. BPA promoted the generation of proinflammatory cytokines IL‐1β, IL‐6, and TNFα in a concentration‐dependent manner (P < 0.05). BPA was identified to increase the expression of proinflammatory mediators NO and PGE2, and its upstream factors iNOS, COX2, and cPLA2 in a concentration‐dependent manner (P < 0.05). Phosphorylation and nuclear translocation of NF‐κB p65 were significantly induced by BPA via IκB degradation (P < 0.05). In addition, phosphorylation of ERK significantly induced by BPA at a concentration which was less than that for phosphorylation of p38 MAPK and JNK (P < 0.05). Furthermore, phosphorylation of STAT3 significantly induced by BPA at a concentration lower than that for phosphorylation of STAT1 (P < 0.05). Phosphorylation of JAK1 and JAK2 was also significantly induced by BPA in a concentration‐dependent manner (P < 0.05).     

MiR-599 regulates LPS-mediated apoptosis and inflammatory responses through the JAK2/STAT3 signalling pathway via targeting ROCK1 in human umbilical vein endothelial cells

MicroRNA plays an integral role in the development of atherosclerosis. Our study aimed to investigate the roles of miR-599 in lipopolysaccharide (LPS)-induced endothelial damage in human umbilical vein endothelial cells (HUVECs). HUVECs were transfected with a miR-599 mimic and negative control, and then exposed to LPS. The expression of miR-599 was detected by quantitative real time-polymerase chain reaction (RT-qPCR). Cell viability was analyzed by CCK-8 assay and trypan blue exclusion assay; the formation of DNA fragments was tested by Cell Death Detection ELISA Plus kit; the incidence of apoptosis was detected by flow cytometry; the expression of p53 and cleaved-caspase 3 (c-caspase 3) was evaluated by western blot. Moreover, the mRNA levels and concentrations of tumour necrosis factor (TNF)-α, interleukin (IL)-6, ICAM-1 and VCAM-1 were assayed by RT-qPCR and ELISA. The results showed that overexpression of miR-599 increased cell viability, reduced DNA fragments, the incidence of apoptosis, as well as the protein levels of p53 and c-caspase 3 in the presence of LPS. TNF-α, IL-6, ICAM-1 and VCAM-1 mRNA levels and concentrations were also decreased upon miR-599 upregulation. In addition, the dual luciferase reporter assay demonstrated that ROCK1 is a direct target of miR-599. MiR-599 overexpression inhibited ROCK1 expression. Induced expression of ROCK1 reversed the roles of miR-599 in apoptosis and inflammation. The gain function of miR-599 function inhibited activation of the JAK2/STAT3 signalling pathway, which was abrogated by overexpression of ROCK1. Taken together, our results indicate that miR-599 attenuates LPS-caused cell apoptosis and inflammatory responses through the JAK2/STAT3 signalling pathway via targeting ROCK1.     

JAK2/STAT3信号通路在人参皂苷Re预处理预防异丙肾上腺素致急性心肌缺血损伤中的作用

目的观察人参皂苷Re预处理对异丙肾上腺素致急性心肌缺血大鼠心肌JAK2/STAT3通路的影响。方法应用异丙肾上腺素建立SD大鼠急性心肌缺血模型,将75只大鼠随机分为空白对照组(Control)、模型组(Model)、葛根素对照组(PUE)、Re高剂量组(Re-H,20 mg·kg^-1)、Re低剂量组(Re-L,10 mg·kg^-1)。Moor激光血流成像系统观测各组大鼠心脏表面血流值;ELISA法测定各组大鼠心肌中CK、LDH、SOD、MDA、GSH的含量;免疫组化法检测Bax、Bcl-2蛋白表达;Western blot方法检测各组大鼠心肌JAK、p-JAK、STAT3、p-STAT3蛋白的表达变化。结果与对照组比较,模型组大鼠心脏表面平均血流量明显下降,心肌CK、LDH、MDA含量升高,GSH、SOD含量下降,Bcl-2/Bax比值下降(P<0.05),JAK2/STAT3通路蛋白的表达有所增加;与模型组比较,Re-H组心肌表面平均血流有明显提升(P<0.05);CK、LDH、MDA含量降低,GSH-Px含量升高(P<0.05),Bcl-2/Bax比值上升(P<0.05),JAK2/STAT3通路蛋白的表达明显增强(P<0.05)。结论人参皂苷Re预处理对急性心肌缺血大鼠心肌有较好的保护作用,该作用可能与JAK2/STAT3通路的激活有关。     

Sinomenine hydrochloride inhibits the progression of plasma cell mastitis by regulating IL-6/JAK2/STAT3 pathway

Plasma cell mastitis (PCM) is a special form of mastitis characterized by periductal inflammation and large-scale plasma cell infiltration. At present, the recurrence rate of PCM after excision is quite high, making PCM a major problem for mammary surgeons. However, no effective drug exists for the treatment of PCM. Numerous studies have demonstrated that Sinomenine hydrochloride (SH) has potent anti-inflammatory and immunoregulatory properties. However, the efficacy and the underlying mechanisms of SH in the treatment of PCM remain unclear. In the present study, we first investigated the therapeutic effects of SH in the PCM mouse model and clarified the possible mechanisms. We found that the levels of plasmocytes and lymphocytes infiltration were alleviated significantly in the 100 mg/kg SH group compared to the control group. In addition, few CD138+ plasma cells were found in the mammary glands of the 100 mg/kg SH group. The levels of Bcl-2 in the 100 mg/kg SH group were dramatically decreased compared with those in the saline group. Mechanistically, we demonstrated that SH inhibited the progression of PCM mainly through downregulating IL-6/JAK2/STAT3 levels. Collectively, our results suggested that SH could inhibit the progression of PCM by suppressing IL-6/JAK2/STAT3 cascades and ultimately achieve a therapeutic effect in PCM. This study provides theoretical support for the clinical application of SH in the treatment of PCM.     

肾间质损伤早期信号蛋白JAK2/STAT3与TGF-β1表达趋势及相关性

目的:控讨幼年大鼠肾小管间质损伤早期,跨膜信号传导通路中JAK2/STAT3信号分子表达趋势及其与转化生长因子-1β(TGF-1β)表达的相关性。方法:以单侧输尿管梗阻(UUO模型)幼年大鼠为实验模型;采用免疫组织化学方法检测,行UUO术后3,7,14,28 d大鼠肾组织JAK2/STST3及TGF-1β蛋白的表达,并从时相上评价JAK2/STAT3与TGF-1β表达的相关性。结果:UUO组3 d各指标表达强度即增加,随着时间的延续,三者呈同步上调趋势。各时间点与对照组比较有统计学差异(P<0.01);UUO组内各时间点间比较有统计学意义(P<0.01),各指标两两之间的相关系数r值均大于0,且呈高度正相关关系。结论:UUO大鼠模型肾小管间质损伤早期,JAK2/STST3及TGF-1β间可能存在一条促肾小管质损伤的信号途径。     

淡豆豉异黄酮对增殖血管平滑肌细胞JAK2/STAT3信号转导通路的影响

目的探讨淡豆豉异黄酮对血管紧张素Ⅱ(angiotensin Ⅱ,AngⅡ)诱导大鼠血管平滑肌细胞(vascular smooth muscle cell,VSMC)增殖及Janus激酶2-细胞信号转导及转录活化因子3(JAK2/STAT3)信号通路的影响。方法建立AngⅡ诱导VSMC增殖模型,MTT法检测VSMC增殖活性;RT-PCR法检测AngⅡ1型受体(angiotensin Ⅱreceptor1,AT1R)mRNA表达;Westernblot法检测JAK2/STAT3信号通路蛋白JAK2,STAT3及其磷酸化表达水平。结果100、200μg·L-1淡豆豉异黄酮可明显抑制AngⅡ诱导的VSMC增殖,并明显下调AT1R mRNA表达水平;200μg·L-1淡豆豉异黄酮可明显下调磷酸化JAK2、磷酸化STAT3的表达。结论淡豆豉异黄酮可抑制AngⅡ诱导的VSMC增殖,其机制可能与下调AT1R表达,阻断JAK2/STAT3信号通路的磷酸化有关。     

右美托咪定在脂多糖诱导急性肺损伤小鼠中对JAK2/STAT3通路影响及意义分析

目的：探讨分析右美托咪定在脂多糖诱导急性肺损伤小鼠中对JAK2/STAT3通路影响及意义分析。方法：将实验室120例健康小鼠作为研究对象,采用随机数字表法分为对照、观察两组,每组60只小鼠,其中对照组小鼠静脉给予10mg/kg脂多糖后即可给予生理盐水5mg/kg,观察组小鼠静脉给予10mg/kg脂多糖后即可给予右美托咪定10mg/kg,比较两组急性肺损伤小鼠蛋白酪氨酸激酶/转录信号传导子和激活子3（JAK2/STAT3）通路与右美托咪定应用与否的关系及影响。结果：两组小鼠治疗前Murray肺损伤评分情况无明显差异,无统计学意义（P﹥0.05）。采用右美托咪定治疗的观察组小鼠肺损伤评分情况明显优于对照组小鼠,差异有统计学意义（P＜0.05）;经对比观察,观察组小鼠雷帕霉素靶蛋白（mTOR）（0.47±0.12）mg/L及雷帕霉素靶蛋白磷酸化（p-mTOR）（0.56±0.15）mg/L水平均优于对照组mTOR（0.37±0.10）mg/L及p-mTOR水平（0.32±0.09）mg/L,差异有统计学意义（P＜0.05）。观察组与对照组小鼠微管相关蛋白（LC3-Ⅱ）水平相近且无明显差异,无统计学意义（P﹥0.05）。结论：急性肺损伤小鼠静脉注射右美托咪定后,肺损伤评分较低,小鼠JAK2/STAT3通路各项生理参数趋于正常,右美托咪定通过抑制JAK2/STAT3通路起到对肺脏的保护作用。     

钙激活的氯离子通道 A4通过抑制 JAK激酶 2/信号转导及转录激活蛋白 3信号通路对食管癌细胞增殖、迁移及侵袭的影响

目的 探讨钙激活的氯离子通道A4(CLCA4)对食管癌细胞增殖、迁移、侵袭及JAK激酶2/信号转导及转录激活蛋白3(JAK2/STAT3)信号通路的影响.方法 实时荧光定量逆转录聚合酶链反应(qRT-PCR)与蛋白质印迹法(Western blotting)分别检测正常人食管鳞状上皮细胞与人食管癌细胞中CLCA4的表达;将合成的CLCA4过表达载体及其对照分别转染至食管癌细胞Eca109,分别记作CLCA4过表达(pcDNA-CLCA4)组、CLCA4阴性对照(pcDNA-NC)组,并将未转染的细胞作为阴性对照(NC)组.四甲基偶氮唑盐微量酶反应比色法(MTT法)检测细胞增殖能力;细胞迁移实验(Transwell)检测细胞迁移及侵袭能力.JAK2/STAT3信号通路激活剂p-JAK2多肽对细胞增殖、迁移及侵袭的影响.Western blotting检测细胞周期蛋白D1(Cy-clinD1)、依赖性激酶抑制因子(P21)、基质金属蛋白酶2(MMP-2)、基质金属蛋白酶9(MMP-9)、JAK2、STAT3、磷酸化JAK激酶2(p-JAK2)、磷酸化信号转导及转录激活蛋白3(p-STAT3)的表达水平.结果 与Het-1A相比,人食管癌细胞KYSE170、Eca109、TE10中CLCA4 mRNA及蛋白表达水平降低(P<0.05);与pcDNA-NC组比较,pcDNA-CLCA4组细胞存活率显著降低[(52.16±11.41)％比(99.57±13.49)％,P<0.05],迁移细胞数[(56.47±10.03)％比(112.49±13.52)％]与侵袭细胞数[(63.43±9.87)％比(123.47±16.58)％]减少(P<0.05),CyclinD1、MMP-2、MMP-9、p-JAK2、p-STAT3的表达水平降低(P<0.05),P21的表达水平升高(P<0.05);激活JAK2/STAT3信号通路可逆转CLCA4过表达对Eca109细胞增殖、迁移及侵袭的抑制作用.结论 CL-CA4过表达可抑制食管癌细胞增殖、迁移及侵袭,其作用机制可能与抑制JAK2/STAT3信号通路活化有关.     

基于miR-370-3p与JAK2/STAT3通路相关性探讨活血荣络方促缺血性脑卒中后血管新生的机制

目的基于miR-370-3p与JAK2/STAT3通路相关性探讨活血荣络方促缺血性脑卒中后血管新生的机制。方法将大鼠随机分为6组,MCAO/R法造模,灌胃给药7 d后免疫荧光染色观察脑组织CD31、vWF及血管内皮生长因子(vascular endothelial growth factor,VEGF)表达;Western blot法检测脑组织JAK2、p-JAK2、STAT3、p-STAT3蛋白的表达;Real-time PCR(RT-PCR)法检测脑组织JAK2、STAT3 mRNA及miR-370-3p的表达;Pearson相关性分析脑组织miR-370-3p与JAK2/STAT3通路的相关性;培养大鼠脑血管平滑肌细胞,实时荧光定量PCR(RT-qPCR)检测LncRNA-H19和miR-370-3p表达;荧光素酶报告实验检测LncRNA-H19和miR-370-3p的靶向关系。结果活血荣络方能增加缺血区微血管密度及VEGF平均荧光强度,上调JAK2、STAT3 mRNA,下调miR-370-3p表达,促进JAK2、p-JAK2、STAT3、p-STAT3表达,且miR-370-3p分别与JAK2、STAT3 mRNA呈高度负相关,此过程能被STAT3 SH2结构域抑制剂Stattic逆转。结论活血荣络方可能通过下调miR-370-3p的表达、激活JAK2/STAT3通路、促进下游VEGF的表达而刺激缺血性脑卒中后血管新生,从而改善神经功能缺损症状。     

Anti-cancer effect of bee venom toxin and melittin in ovarian cancer cells through induction of death receptors and inhibition of JAK2/STAT3 pathway

We investigated whether bee venom and melittin, a major component of bee venom, inhibit cell growth through enhancement of death receptor expressions in the human ovarian cancer cells, SKOV3 and PA-1. Bee venom (1-5 μg/ml) and melittin (0.5-2 μg/ml) inhibited the growth of SKOV3 and PA-1 ovarian cancer cells by the induction of apoptotic cell death in a dose dependent manner. Consistent with apoptotic cell death, expression of death receptor (DR) 3 and DR6 was increased in both cancer cells, but expression of DR4 was increased only in PA-1 cells. Expression of DR downstream pro-apoptotic proteins including caspase-3, 8, and Bax was concomitantly increased, but the phosphorylation of JAK2 and STAT3 and the expression of Bcl-2 were inhibited by treatment with bee venom and melittin in SKOV3 and PA-1 cells. Expression of cleaved caspase-3 was increased in SKOV3, but cleaved caspase-8 was increased in PA-1 cells. Moreover, deletion of DR3, DR4, and DR6 by small interfering RNA significantly reversed bee venom and melittin-induced cell growth inhibitory effect as well as down regulation of STAT3 by bee venom and melittin in SKOV3 and PA-1 ovarian cancer cell. These results suggest that bee venom and melittin induce apoptotic cell death in ovarian cancer cells through enhancement of DR3, DR4, and DR6 expression and inhibition of STAT3 pathway.     

龙胆苦苷对人胰腺癌细胞PANC-1凋亡及IL-6/JAK2/STAT3信号通路的影响

目的:研究龙胆苦苷对人胰腺癌细胞PANC-1凋亡的影响,并从白细胞介素6(IL-6)/Janus激酶2(JAK2)/信号转导与转录激活因子3(STAT3)信号通路角度研究其作用机制。方法:以PANC-1细胞为研究模型,采用MTT法测定0(阴性对照)、2、4、8、16、32、64、128 mg/L龙胆苦苷作用于细胞72 h后的增殖抑制率,并计算其半数抑制浓度(IC50)。分别将细胞分为阴性对照组、吉西他滨组(阳性对照,4 mg/L)和龙胆苦苷低、中、高浓度组(15、30、60 mg/L)。分别于培养1、3、5、7 d后,采用台盼蓝拒染法进行活细胞计数,考察各组细胞的生长情况;培养72 h后,采用克隆形成试验考察细胞的克隆形成率,采用Hoechst 33258染色法检测细胞凋亡率,采用逆转录-聚合酶链式反应法和Western blotting法分别测定细胞中IL-6、JAK2、STAT3 mRNA及其蛋白表达水平。结果:4～28 mg/L龙胆苦苷均可显著抑制细胞的增殖(P<0.05或P<0.01),并具有一定的浓度依赖性趋势,IC50为9.54 mg/L。与阴性对照组比较,吉西...     

当归对阴虚哮喘小鼠气道杯状细胞及JAK1/STAT6信号通路的影响

目的 探讨当归对阴虚哮喘小鼠气道杯状细胞增生及JAK1/STAT6信号通路的影响。方法 采用卵清白蛋白与甲状腺复制阴虚哮喘动物模型,观测当归对阴虚哮喘小鼠肺通气功能、哮喘气道杯状细胞增生、肺组织中Muc5ac、IL-13、IL-4含量以及JAK1与STAT6表达水平的影响。结果 当归可明显缓解阴虚哮喘小鼠呼吸频率、潮气量及增强呼气间歇的异常变化,改善肺功能,降低肺指数及肺组织湿干重比值,抑制气道杯状细胞增生,降低肺组织中Muc5ac、IL-13及IL-4含量,抑制肺组织JAK1及STAT6蛋白的表达(P＜0.05, 0.01)。结论 当归具有明显缓解气道杯状细胞增生及Muc5ac高表达而平喘的作用,抑制JAK1/STAT6信号通路是其改善哮喘气道黏液分泌失衡的作用机制之一。