雷帕霉素对mTOR基因诱导的NIH3T3成纤维细胞增殖的影响

目的探讨雷帕霉素对mTOR基因诱导的NI H3T3成纤维细胞增殖的影响。方法以mTOR基因转染小鼠NI H3T3成纤维细胞,以雷帕霉素干预,用MTT法检测细胞增殖情况,用RT-PCR和Western blot方法测定细胞p70S6KmRNA与蛋白的表达。结果 MTT法检测转染mTOR基因后细胞增殖能力增强,雷帕霉素可抑制其增殖;RT-PCR与Western blot检测转染后细胞p70S6K的mRNA与蛋白表达水平明显增加,雷帕霉素可抑制p70S6KmRNA与蛋白表达水平。结论雷帕霉素可能通过抑制mTOR/p70S6K信号通路抑制成纤维细胞增殖。     

曲尼司特对病毒性心肌炎小鼠心肌纤维化的作用

目的 探讨曲尼司特在病毒性心肌炎心肌纤维化中的作用.方法 72 只BALB/C 小鼠随机分为对照组、模型组和干预组(n=24).模型组和干预组小鼠感染柯萨奇病毒B3 建立病毒性心肌炎模型,其中干预组小鼠造模后即用曲尼司特(200 mg/kg)灌胃给药直到取材前一天;对照组和模型组小鼠予等量生理盐水灌胃.造模后第7、14、28 天取各组8 只小鼠心肌组织,甲苯胺蓝染色、硫堇染色检测心脏肥大细胞数目,苏木精-伊红染色观察心肌组织病理学变化,Masson 三色染色观察心肌纤维化,RT-PCR、免疫组化检测骨桥蛋白(OPN)、转化生长因子-β1(TGF-β1)的mRNA 及蛋白表达,并对OPN mRNA 与肥大细胞数目作相关性分析.结果 模型组和干预组小鼠心肌组织OPN mRNA 及蛋白的表达于第7 天达最高,第14 天次之,第28 天最低;TGF-β1 mRNA 及蛋白的表达第7 天升高,第14 天达高峰,第28 天较前稍下降;干预组小鼠心肌组织TGF-β1、OPN mRNA 及蛋白在各时间点的表达均低于模型组(均P<0.05),但仍高于对照组(均P<0.05).肥大细胞的数目与OPN 的表达呈正相关.结论 曲尼司特可能通过减少肥大细胞数,抑制TGF-β1 及OPN 表达,在抗心肌纤维化过程中起重要作用.     

以发热和黄疸起病的小儿播散型组织胞浆菌病1例

<正>患儿,男,3岁2月,双胎之大,因发热2月,黄疸1月入院。入院2月前无明显诱因出现间断性发热,体温波动在39～40℃,每次夜间1～2次高热,持续约4～8h,清晨可自行退热,无咳嗽、咳痰、畏寒等。间断给予抗炎、对症处理,发热无缓解,入院前     

Effect of procalcitonin on lipopolysaccharide-induced expression of nucleotide-binding oligomerization domain-like receptor protein 3 and caspase-1 in human umbilical vein endothelial cells北大核心CSCD

Objective To study the effect of procalcitonin (PCT) on lipopolysaccharide (LPS)-induced expression of the pyroptosis-related proteins nucleotide-binding oligomerization domain-like receptor protein 3 (NLRP3) and caspase-1 in human umbilical vein endothelial cells (HUVECs). Methods HUVECs were induced by LPS to establish a model of sepsis-induced inflammatory endothelial cell injury. The experiment was divided into two parts. In the first part, HUVECs were randomly divided into four groups: normal control, LPS (1 μg/mL), PCT (10 ng/mL), and LPS+PCT (n=3 each). In the second part, HUVECs were randomly grouped: normal control, LPS, and LPS+PCT of different concentrations (0.1, 1, 10, and 100 ng/mL) (n=3 each). Quantitative real-time PCR and Western blot were used to measure the mRNA and protein expression levels of NLRP3 and caspase-1 in each group. Results In the first experiment: compared with the normal control group, the PCT, LPS, and LPS+PCT groups had significantly upregulated mRNA and protein expression levels of NLRP3 and caspase-1 (P<0.05); compared with the LPS group, the LPS+PCT group had significantly downregulated mRNA and protein expression levels of NLRP3 and caspase-1 (P<0.05). In the second experiment: compared with those in the LPS group, the mRNA and protein expression levels of NLRP3 and caspase-1 in the LPS+PCT of different concentrations groups were significantly downregulated in a concentration-dependent manner (P<0.05). Conclusions LPS can promote the expression of the pyroptosis-related proteins NLRP3 and caspase-1 in HUVECs, while PCT can inhibit the LPS-induced expression of the pyroptosis-related proteins NLRP3 and caspase-1 in HUVECs in a concentration-dependent manner. © 2023 Xiangya Hospital of CSU. All rights reserved.