白细胞介素-21在疾病中作用的研究进展

白细胞介素-21(IL-21)是一种新近发现的细胞因子,具有广泛生物学活性,能够调节B细胞的分化及免疫球蛋白类别转换,促进T细胞、NK细胞的增殖、分化,提高NK细胞杀伤活性,是多种自身免疫性疾病、感染性疾病、变态反应性疾病和肿瘤的重要致病因素,在疾病的发生发展中举足轻重,具有潜在临床研究价值,可能成为多种疾病治疗的新靶标.作为新的免疫系统调节因子,IL-21在免疫性疾病中的作用越来越受到关注,已成为近年来研究的热点.     

应用PDCA循环提高实验室急诊检验报告时间符合率

实验室检查提供了诊断疾病、监测病情、判断疗效及预后的依据。临床医师60%~70%的重要决策基于实验室检测结果,对实验室检测的质量与速度都有一定要求。随着技术的进步,检测质量已经有了很大的提高,临床对于提高检测速度越来越关注[1]。急诊检验处于医疗第一线,是抢救危重患者的重要环节,及时、准确地发出急诊检验报告尤为重要。急诊检验报告的及时性主要是用检验结果的回报告时间来评价的[2-3]。     

妊娠期糖尿病患者血小板功能状态的变化及其临床意义研究

目的:评估妊娠期糖尿病(GDM)患者的血小板(PLT)功能状态的变化情况及其临床意义。方法:选取2017年3月至2017年10月在广州市妇女儿童医疗中心产检的85例GDM患者为观察组,选取同期85例正常孕妇为对照组,收集其临床资料及乙二胺四乙酸(EDTA)抗凝全血,Sysmex XE–5000全自动血细胞分析仪进行血常规及网织血小板(ret–PLT)检测。结果:观察组患者PLT计数较对照组降低,而血小板平均体积(MPV)及未成熟血小板指数(IPF)、高荧光强度血小板分数(H–IPF%)等参数较对照组明显升高,差异具有统计学意义(P0.05)。结论:GDM患者PLT更新率升高,活化增强,检测PLT计数、IPF及H–IPF%等参数,可对GDM患者进行PLT功能评价,预测心血管并发症风险。     

Role of angiotensin Ⅱ and JAK2 signal pathway in transdifferentation of renal tubular cells in mice after acute ischemic followed by reperfusion

Objective To investigate the effect of angiotensin (Ang) Ⅱ and its Janns-activated kinase-2 (JAK2) signal pathway in transdifferentiation of renal tubular cells under the challenge of acute ischemic reperfusion injury.Methods Models of acute ischemic reperfusion injury were established and the level of local Ang Ⅱ ,a key element of renin-angiotensin system (RAS),in kidney was measured using radioimmunity technique.The expression of α-smooth muscle actin (α-SMA),a phenotype of mesenchymal cells,was detected by RT-PCR and inununohistochemistry methods.Renal tubule cells ( NRK-52E) were cultured with various concentration of Ang Ⅱ ,followed by blocking of PD123319,Ang U receptor 2 antagonist,and AG490,an inhibitor of JAK2 signal pathway.Results Ang 0 of kidney tissue increased immediately after acute ischemic-reperfusion injury,in time dependent fashion.Expression of α-SMA in renal tubule cells was found at 48 hours after ischemic-reperfusion injury and in NRK-52E cells treated by high concentration of Ang Ⅱ and was dose and time dependent.The peak of α-SMA expression was seen after 30 minute treatment at the dose of 10-9'mol/L,which was interrupted by both of PD123319 and AG490.Conclusions Transdifferentiarion of renal tubular epithelial cells occurs under acute ischemic- reperfusion injury.Local renin-angiotensin system may play a role in the transdifferentiation of TEC through AT2 receptor and its JAK2 signal pathway.     

RNAi干扰WT1和Pax2表达对逆转肾小管上皮间充质转化的作用

 【目的】 探讨抑制肾小管上皮间充质转化(EMT)过程中胚胎发育关键基因WT1和Pax2的表达对EMT的逆转作用。【方法】 采用RNAi技术分别抑制WT1和Pax2。分别构建pshRNA-WT1和pshRNA-Pax2表达载体,采用脂质体转染技术,使质粒瞬时转染NEK52E细胞后用10 ng/mL IL-1α刺激细胞,分别提取不同时间点细胞的RNA和蛋白质,采用RT-PCR和Western blot检测细胞WT1、Pax2、Snail、上皮细胞标志E-cadherin和间充质标志α-SMA的mRNA和蛋白质的表达,并观察NRK52E细胞的形态。【结果】构建的pshRNA-WT1和pshRNA-Pax2表达载体可在转染细胞内发挥RNAi作用抑制WT1和Pax2基因的表达,抑制率分别为80.4 %和82.7 %。分别抑制WT1和Pax2基因后EMT过程受阻,α-SMA和Snail的表达显著减少,E-cadherin的表达无显著性变化,细胞形态未发生明显的成纤维化样改变。【结论】 WT1和Pax2基因是EMT中的关键基因,分别抑制胚胎发育关键基因WT1和Pax2均可使EMT受阻。阻断WT1和Pax2的表达有望中止EMT及肾纤维化的发生。     

Role of angiotensin Ⅱ and JAK2 signal pathway in transdifferentation of renal tubular cells in mice after acute ischemic followed by reperfusion

Objective To investigate the effect of angiotensin (Ang) Ⅱ and its Janns-activated kinase-2 (JAK2) signal pathway in transdifferentiation of renal tubular cells under the challenge of acute ischemic reperfusion injury.Methods Models of acute ischemic reperfusion injury were established and the level of local Ang Ⅱ ,a key element of renin-angiotensin system (RAS),in kidney was measured using radioimmunity technique.The expression of α-smooth muscle actin (α-SMA),a phenotype of mesenchymal cells,was detected by RT-PCR and inununohistochemistry methods.Renal tubule cells ( NRK-52E) were cultured with various concentration of Ang Ⅱ ,followed by blocking of PD123319,Ang U receptor 2 antagonist,and AG490,an inhibitor of JAK2 signal pathway.Results Ang 0 of kidney tissue increased immediately after acute ischemic-reperfusion injury,in time dependent fashion.Expression of α-SMA in renal tubule cells was found at 48 hours after ischemic-reperfusion injury and in NRK-52E cells treated by high concentration of Ang Ⅱ and was dose and time dependent.The peak of α-SMA expression was seen after 30 minute treatment at the dose of 10-9'mol/L,which was interrupted by both of PD123319 and AG490.Conclusions Transdifferentiarion of renal tubular epithelial cells occurs under acute ischemic- reperfusion injury.Local renin-angiotensin system may play a role in the transdifferentiation of TEC through AT2 receptor and its JAK2 signal pathway.     

Role of angiotensin Ⅱ and JAK2 signal pathway in transdifferentation of renal tubular cells in mice after acute ischemic followed by reperfusion

Objective To investigate the effect of angiotensin (Ang) Ⅱ and its Janns-activated kinase-2 (JAK2) signal pathway in transdifferentiation of renal tubular cells under the challenge of acute ischemic reperfusion injury.Methods Models of acute ischemic reperfusion injury were established and the level of local Ang Ⅱ ,a key element of renin-angiotensin system (RAS),in kidney was measured using radioimmunity technique.The expression of α-smooth muscle actin (α-SMA),a phenotype of mesenchymal cells,was detected by RT-PCR and inununohistochemistry methods.Renal tubule cells ( NRK-52E) were cultured with various concentration of Ang Ⅱ ,followed by blocking of PD123319,Ang U receptor 2 antagonist,and AG490,an inhibitor of JAK2 signal pathway.Results Ang 0 of kidney tissue increased immediately after acute ischemic-reperfusion injury,in time dependent fashion.Expression of α-SMA in renal tubule cells was found at 48 hours after ischemic-reperfusion injury and in NRK-52E cells treated by high concentration of Ang Ⅱ and was dose and time dependent.The peak of α-SMA expression was seen after 30 minute treatment at the dose of 10-9'mol/L,which was interrupted by both of PD123319 and AG490.Conclusions Transdifferentiarion of renal tubular epithelial cells occurs under acute ischemic- reperfusion injury.Local renin-angiotensin system may play a role in the transdifferentiation of TEC through AT2 receptor and its JAK2 signal pathway.     

广州市学龄前儿童乙肝疫苗免疫效果的定量分析

目的:了解广州市学龄前儿童乙肝疫苗的免疫效果,为乙肝疫苗加强免疫提供科学依据。方法:采用化学发光微粒子免疫分析法(CMIA)定量检测2 542名广州市0～6岁HBsAg阴性儿童血清抗-HBs浓度。结果:CMIA检测广州市0～6岁儿童血清抗-HBs总体阳性率为94.34%,随着年龄增长,血清抗-HBs阳性率逐渐降低,组间差异存在统计学意义(P<0.01);血清抗-HBs浓度亦逐渐下降,组间差异有统计学意义(P<0.01)。结论:广州市学龄前儿童乙肝免疫整体处于较高水平,但由于抗体的时效性,应定期检测血清抗-HBs浓度,及时复种加强免疫。     

血管紧张素Ⅱ与其介导的蛋白质酪氨酸激酶JAK2信号通路在缺血再灌注肾损伤时小管上皮细胞逆向分化中的作用

目的 探讨血管紧张素(Ang)Ⅱ与其介导的蛋白酪氨酸激酶JAK2信号通路在急性缺血再灌注肾损伤模型中发生的肾小管上皮细胞逆向分化的作用机制.方法 (1)建立Wistar大鼠急性缺血再灌注肾损伤模型,采用放射免疫法检测肾脏局部AngⅡ的水平变化,采用免疫组织化学ABC法和RT-PCR,观察间充质细胞表面标记α-平滑肌肌动蛋白(α-SMA)的表达.(2)模拟高、中、低浓度的肾素-血管紧张素系统(RAS)环境,体外观察培养的肾小管上皮细胞(NRK-52E)逆向分化的情况.(3)先后阻断AngⅡ受体(AT2R)及其介导的Ang Ⅱ信号转导通路的JAK2,研究AngⅡ与JAK2通路对肾小管上皮细胞逆向分化的影响.结果 (1)肾脏缺血再灌注损伤后0、24、48、72、96、120 h,局部AngⅡ含量持续增高,分别为(406.7±106.1)、(463.0±112.9)、(526.6±128.3)、(649.5±131.5)、(875.4±150.2)、(980.8±155.2)ng/L,P<0.05.(2)缺血再灌注后48 h,肾小管上皮细胞开始表达α-SMA mRNA及蛋白质.(3)高浓度(10-7mol/L)Ang Ⅱ刺激可诱导体外培养的肾小管上皮细胞表达α-SMA,且呈剂量和时间依赖性.10-9,mol/L浓度AngⅡ刺激30 min时,α-SMA表达水平最高.无论是阻断AT2R抑或JAK2信号通路,肾小管上皮细胞表达α-SMA均明显受到抑制.结论 急性缺血再灌注损伤时肾小管上皮细胞可向间充质细胞逆向分化,局部RAS启动与其密切相关.AngⅡ可能通过AT2R及其介导的JAK2信号通路促发肾小管细胞的逆向分化.