摘要
[目的]探讨 C反应蛋白(CRP)和肿瘤坏死因子-α(TNF-α)对人外周血单核细胞分泌妊娠相关血浆蛋白-A (PAPP-A)的影响。[方法]采用密度梯度离心法分离及培养人外周血单核细胞,超敏ELISA法测定CRP或rhTNF-α刺激单核细胞后细胞上清液中PAPP-A的含量,Trans AMTM 技术检测CRP或rhTNF-α对单核细胞NF-κB活性的影响,并与空白对照组比较。同时观察给予核因子-κB (NF-κB)抑制剂 BAY11-70682预处理后,CRP 或 rhTNF-α对单核细胞合成分泌PAPP-A的影响。[结果]与空白对照组细胞上清液中PAPP-A含量(1.1±0.1) mIU/L相比,CRP(20 mg/L)刺激单核细胞2h后,PAPP-A含量开始显著增加(2.2±0.2)mIU/L,在24h达最高值(9.8±0.5)mIU/L(P <0.05),呈时间依赖性。给予rhTNF-α(100 ng/mL)刺激后,细胞上清液中PAPP-A含量在8 h达到高峰(14.5±1.1) mIU/L( P <0.05),24h(11.7±0.9)mIU/L仍高于空白对照组( P <0.05)。CRP和 rhTNF-α均呈剂量依赖性增加细胞上清液 PAPP-A 含量。CRP和rhTNF-α可增加单核细胞的磷酸化 NF-κB p65水平[分别为(0.88±0.06) mg/L、(1.06±0.12) mg/L],显著高于对照组(0.35±0.04) mg/L( P <0.05)。给予BAY11-70682预处理后,CRP和 rhTNF-α诱导单核细胞 NF-κB活性增加和分泌PAPP-A的作用受到抑制。[结论]CRP和TNF-α能促进人外周血单核细胞合成分泌PAPP-A ,其作用与NF-κB信号通路的激活有关。这可能是急性冠脉综合征患者血清PA PP-A升高的机制。
[Objective]To explore the effect of C-reactive protein(CRP) and tumor necrosis factor-α(TNF-α) on pregnancy associated plasma protein-A (PAPP-A ) secreted by human peripheral blood monocytes .[Methods] Human peripheral blood monocytes were isolated and cultured by using density gradient centrifugation .After monocytes were stimulated by CRP or rhTNF-α,supersensitive enzyme linked immunosorbent assay (ELISA) was used to detect the level of PAPP-A in supernatants . The effect of CRP or rhTNF-αon nuclear factor-κB(NF-κB) in monocytes was measured by TransAMTM technique ,and com-pared with control group .Meanwhile ,the effect of CRP or rhTNF-αon PAPP-A secreted by monocytes after NF-κB inhibitor BAY11-70682 treatment was observed .[Results]Compared with control group(1 .1 ± 0 .1mIU/L) ,PAPP-A level in culture su-pernatantsaftermonocytesstimulatedwithCRP(20mg/L)for2hbegantoincreasesignificantly(2.2±0.2mIU/L)andupto the peak value(9 .8 ± 0 .5mIU/L) after 24h in a time-dependent manner( P <0 .05) .After rhTNF-α(100ng/mL) stimulation , PAPP-A level increased up to the peak value(14 .5 ± 1 .1mIU/L) at 8h( P <0 .05) and the value(11 .7 ± 0 .9mIU/L) at 24h , which was still higher than that in control group ( P<0 .05) .CRP and rhTNF-αcould elevate PAPP level in supernatants in a dose-dependent manner .CRP and rhTNF-αcould increase phosphorylation NF-κB p65 level in monocytes[(0 .88 ± 0 .06mg/L) and (1 .06 ± 0 .12mg/L) ,respectively] ,which were higher than those in control group(0 .35 ± 0 .04mg/L)( P <0 .05) .After BAY11-70682 pretreatment ,the increasing of NF-κB activity and the secretion of PAPP-A in monocytes induced by CRP and rhTNF-αwere inhibited .[Conclusion]CRP and TNF-αcan promote the synthesis and secretion of PAPP-A in human peripheral blood monocytes ,which is related with the activation of NF-κB signal transduction and may be the mechanism of th
出处
《医学临床研究》
CAS
2013年第11期2084-2087,共4页
Journal of Clinical Research
基金
北京市自然科学基金资助项目(No7092093);首都医科大学基础-临床科研合作基金(No 12JL37);北京市卫生系统高层次卫生技术人才资助项目