多聚腺苷酸结合蛋白相互作用蛋白1[Poly(A)-binding protein-interacting protein 1,Paip1]是哺乳动物特有的蛋白质,可有效参与真核生物基因表达及细胞周期调控,并与肿瘤演进及预后密切相关。近年来Paip1成为肿瘤研究热点,Paip1与肿瘤...多聚腺苷酸结合蛋白相互作用蛋白1[Poly(A)-binding protein-interacting protein 1,Paip1]是哺乳动物特有的蛋白质,可有效参与真核生物基因表达及细胞周期调控,并与肿瘤演进及预后密切相关。近年来Paip1成为肿瘤研究热点,Paip1与肿瘤细胞增殖、迁移、侵袭和上皮间质转化进程密切相关,可能是肿瘤进展及预后不良的潜在生物标志和新的治疗靶点。但其具体作用机制尚未阐明。本文就Paip1的结构、功能、泛素化和降解及其与肿瘤的关系等方面作一综述,为其在肿瘤中的研究提供新思路。展开更多
AIM: To investigate the mechanism of calcyclin binding protein/Siah-1 interacting protein(Cacy BP/SIP) nuclear translocation in promoting the proliferation of gastric cancer(GC) cells. METHODS: The effect of Cacy BP/S...AIM: To investigate the mechanism of calcyclin binding protein/Siah-1 interacting protein(Cacy BP/SIP) nuclear translocation in promoting the proliferation of gastric cancer(GC) cells. METHODS: The effect of Cacy BP/SIP nuclear translocation on cell cycle was investigated by cell cycle analysis. Western blot analysis was used to assess the change in expression of cell cycle regulatory proteins and proteasome-mediated degradation of p27Kip1. Coimmunoprecipitation(co-IP) analysis was performed to examine the binding of Cacy BP/SIP with Skp1. A Cacy BP/SIP truncation mutant which lacked the Skp1 binding site was constructed and fused to a fluorescent protein. Subsequently, the effect on Skp1 binding with the fusion protein was examined by co-IP, while localization of fluorescent fusion protein observed by confocal laser microscopy, and change in p27Kip1protein expression assessed by Western blot analysis.RESULTS: Cacy BP/SIP nuclear translocation induced by gastrin promoted progression of GC cells from G1 phase. However, while Cacy BP/SIP nuclear translocation was inhibited using si RNA to suppress Cacy BP/SIP expression, cell cycle was clearly inhibited. Cacy BP/SIP nuclear translocation significantly decreased the level of cell cycle inhibitor p27Kip1, increased Cyclin E protein expression whereas the levels of Skp1, Skp2, and CDK2 were not affected. Upon inhibition of Cacy BP/SIP nuclear translocation, there were no changes in protein levels of p27Kip1 and Cyclin E, while p27Kip1 decrease could be prevented by the proteasome inhibitor MG132. Moreover, Cacy BP/SIP was found to bind to Skp1 by immunoprecipitation, an event that was abolished by mutant Cacy BP/SIP, which also failed to stimulate p27Kip1 degradation, even though the mutant could still translocate into the nucleus.CONCLUSION: Cacy BP/SIP nuclear translocation contributes to the proliferation of GC cells, and Cacy BP/SIP exerts this effect, at least in part, by stimulating ubiquitin-mediated degradation of p27Kip1.展开更多
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...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-NC组、大于空白组[(0.87±0.26)U比(1.65±0.40)、(0.62±0.20)U],差异有统计学意义(P<0.05)。结论Trx1/Txnip系统中下调Txnip能明显抑制腹膜间皮细胞NLRP3炎症小体及功能。展开更多
文摘多聚腺苷酸结合蛋白相互作用蛋白1[Poly(A)-binding protein-interacting protein 1,Paip1]是哺乳动物特有的蛋白质,可有效参与真核生物基因表达及细胞周期调控,并与肿瘤演进及预后密切相关。近年来Paip1成为肿瘤研究热点,Paip1与肿瘤细胞增殖、迁移、侵袭和上皮间质转化进程密切相关,可能是肿瘤进展及预后不良的潜在生物标志和新的治疗靶点。但其具体作用机制尚未阐明。本文就Paip1的结构、功能、泛素化和降解及其与肿瘤的关系等方面作一综述,为其在肿瘤中的研究提供新思路。
基金Supported by the National Natural Science Foundation of China,No.81072040the Specialized Research Fund for the Doctoral Program of Ningxia Medical University
文摘AIM: To investigate the mechanism of calcyclin binding protein/Siah-1 interacting protein(Cacy BP/SIP) nuclear translocation in promoting the proliferation of gastric cancer(GC) cells. METHODS: The effect of Cacy BP/SIP nuclear translocation on cell cycle was investigated by cell cycle analysis. Western blot analysis was used to assess the change in expression of cell cycle regulatory proteins and proteasome-mediated degradation of p27Kip1. Coimmunoprecipitation(co-IP) analysis was performed to examine the binding of Cacy BP/SIP with Skp1. A Cacy BP/SIP truncation mutant which lacked the Skp1 binding site was constructed and fused to a fluorescent protein. Subsequently, the effect on Skp1 binding with the fusion protein was examined by co-IP, while localization of fluorescent fusion protein observed by confocal laser microscopy, and change in p27Kip1protein expression assessed by Western blot analysis.RESULTS: Cacy BP/SIP nuclear translocation induced by gastrin promoted progression of GC cells from G1 phase. However, while Cacy BP/SIP nuclear translocation was inhibited using si RNA to suppress Cacy BP/SIP expression, cell cycle was clearly inhibited. Cacy BP/SIP nuclear translocation significantly decreased the level of cell cycle inhibitor p27Kip1, increased Cyclin E protein expression whereas the levels of Skp1, Skp2, and CDK2 were not affected. Upon inhibition of Cacy BP/SIP nuclear translocation, there were no changes in protein levels of p27Kip1 and Cyclin E, while p27Kip1 decrease could be prevented by the proteasome inhibitor MG132. Moreover, Cacy BP/SIP was found to bind to Skp1 by immunoprecipitation, an event that was abolished by mutant Cacy BP/SIP, which also failed to stimulate p27Kip1 degradation, even though the mutant could still translocate into the nucleus.CONCLUSION: Cacy BP/SIP nuclear translocation contributes to the proliferation of GC cells, and Cacy BP/SIP exerts this effect, at least in part, by stimulating ubiquitin-mediated degradation of p27Kip1.
文摘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-NC组、大于空白组[(0.87±0.26)U比(1.65±0.40)、(0.62±0.20)U],差异有统计学意义(P<0.05)。结论Trx1/Txnip系统中下调Txnip能明显抑制腹膜间皮细胞NLRP3炎症小体及功能。
