目的探究硫氧还蛋白1(Trx1)/硫氧还蛋白相互作用蛋白(Txnip)对腹膜间皮细胞核苷酸结合寡聚化结构域样受体蛋白3(NLRP3)炎症小体的调控作用及可能机制。方法前瞻性采用随机数字表法将人腹膜间皮细胞(HMrSV5)分为三组,一组采用10%胎牛血清(FBS)培养液(空白组)、一组采用转染小干扰RNA(siRNA)阴性对照的4.25%腹膜透析液(PDS)与10%FBS培养液(si-NC组),一组采用转染靶向沉默Txnip siRNA的4.25%PDS与10%FBS培养液(si-Txnip组)。采用实时定量聚合酶链反应(qRT-PCR)、免疫印迹法(WB)测定各组Trx1、Txnip、NLRP3 mRNA与蛋白表达水平;采用MTT法测定各组培养不同时间点细胞增殖情况;采用酶联免疫吸附法(ELISA)测定上清液白细胞介素(IL)-1β、IL-6水平和半胱氨酸蛋白酶1(caspase-1)活性。结果si-NC组、si-Txnip组培养1、2、3 d HMrSV5增殖活性均低于空白组(P<0.05);并且si-Txnip组培养1、2、3 d HMrSV5增殖活性均高于si-NC组(0.402±0.009比0.372±0.010、0.554±0.016比0.482±0.008、0.700±0.013比0.590±0.010),差异有统计学意义(P<0.05)。si-NC组、si-Txnip组Txnip、NLRP3 mRNA表达均高于空白组(P<0.05);并且si-Txnip组Txnip、NLRP3 mRNA表达低于si-NC组(1.43±0.32比2.80±0.43、2.38±0.35比3.42±0.40),si-Txnip组Trx1 mRNA表达低于空白组、高于si-NC组(2.24±0.35比3.50±0.38、1.18±0.23),差异有统计学意义(P<0.05)。si-NC组、si-Txnip组Txnip、NLRP3蛋白表达均高于空白组(P<0.05);si-Txnip组Txnip、NLRP3蛋白表达低于si-NC组(0.453±0.108比0.754±0.116),si-Txnip组Trx1蛋白表达低于空白组、高于si-NC组(0.514±0.112比0.753±0.125、0.297±0.010),差异有统计学意义(P<0.05)。si-NC组、si-Txnip组上清液IL-1β、IL-6水平均高于空白组[(0.45±0.07)、(0.35±0.06)μg/L比(0.23±0.05)μg/L,(3.00±0.38)、(2.32±0.30)μg/L比(1.95±0.34)μg/L],si-Txnip组上清液IL-1β、IL-6水平低于si-NC组,差异有统计学意义(P<0.05)。si-Txnip组上清液caspase-1活性小于si-
Tuberculosis(TB)is a chronic infectious disease,which is caused by the pathogen Mycobacterium tuberculosis(Mtb)and reemerged as a global health risk with a significant proportion of multi-drug resistant and extensively drug resistant TB cases.It is very urgent to find some novel high-confidence drug targets in Mtb for discovering the effective anti-TB agents.Thioredoxin reductase(TrxR)has been identified to be a highly viable target for anti-TB drugs for its important role in protecting the pathogen from thiol-specific oxidizing stress,regulating intracellular dithiol/disulfide homeostasis and DNA replication and repair.In the present work,a near-infrared(NIR)fluorescent probe DDAT was developed for the detection of TrxR activity and used to high-throughput screen the TrxR inhibitors from natural products.Two screened TrxR inhibitors from Sappan Lignum and microbial metabolites that were further used to inhibit Mycobacterium tuberculosis.All the results indicate that DDAT is a practical fluorescent molecular tool for the discovery of potential anti-TB drugs.
Fei YanXin ZhaoRuibo LiXiuyan HanQiulong YanLei FengXiulan XinJingnan CuiXiaochi Ma
