Conclusions IL-1β promotes GH secretion and synthesis in rat MtT/S somatotroph cells. The stimulatory effect of IL-1β on hGH gene

promoter appears to require the activation of MEK, p38 MAPK, PI3-K, and a fragment of promoter sequence that spans the –196 to –132 bp of the gene, but it may be unlinked with Pit-1 protein.
本研究观察丝裂原活化蛋白激酶对全反式维甲酸(ATRA)诱导NB4细胞分化的影响并探讨其机制。采用MTT法测定细胞增殖活性,用流式细胞术分析细胞周期,NBT还原实验检测粒系分化,底物磷酸化法测定细胞外调节激酶(ERK)活性。结果显示:0.01-0.1μmol/L的ATRA呈时间和剂量依赖方式抑制NB4细胞增殖,并诱导NB4细胞向粒系分化;在这过程中ATRA激活ERK活性,ERK抑制剂PD98059能部分阻断ATRA的作用。p38MAPK的特异抑制剂SB203580与ATRA联合应用部分阻断了ATRA对细胞的生长抑制和诱导分化作用。结论:ATRA在诱导NB4细胞分化过程中激活ERK和P38MAPK途径,并且对该途径有依赖作用。
目的:探讨P38MAPK抑制剂对急性水肿型胰腺炎的疗效及其机制。方法:雨蛙素建立小鼠水肿型胰腺炎模型,分成对照组、造模组和SB203580治疗组,分别测定血清淀粉酶、血清TNF-α和IL-6,并作胰腺病理评分。结果:SB203580组水肿型胰腺炎的病理病变减轻,血清淀粉酶水平下降,但血清TNF-α与IL-6水平无变化。结论:抑制P38MAPK传导途径能减轻水肿型胰腺炎,但与TNF-α、IL-6无明显关系。
目的研究结核分枝杆菌早期分泌抗原CFP-10-ES-AT-6复合物(CE复合物)对人单核-巨噬细胞功能表型的影响及其作用的细胞信号传导通路。方法分别采用ELISA法以及流式细胞仪检测大肠杆菌克隆表达纯化的CE复合物在不同时间及浓度对人单核-巨噬细胞TNFα-产生对细胞表型的影响,并且应用各种细胞信号传导通路抑制剂来探讨CE复合物作用的细胞信号传导通路。结果结核分枝杆菌CE复合物能够在早期(6~8h)诱导人单核-巨噬细胞活化,大量产生TNFα-,但在晚期(>48 时间 Cilengitide 价格 h),则没有此作用;细胞信号传导通路MEK1/2和p38MAPK的选择性抑制剂SB203580、PD98059、U0126能抑制CE的这种作用;CE复合物在早期(18 h)促进单核-巨噬细胞表面抗原提呈功能分子CD80、CD40的表达。结论CE复合物在感染早期可能通过激活MEK1/2和p38MAPK刺激单核巨噬细胞活化,但在晚期则没有此作用。在感染早期可能具有重要的抗结核保护作用。
p38MAPKs是一个激酶家族,负责调节包括细胞迁移、增生和分化在内的多种细胞功能。本文主要介绍p38对少突胶质细胞分化的调节作用。采用PD169316和SB203580抑制p38后,不同分化阶段少突胶质细胞特异性标志物的蛋白和mRNA的聚集减少,包括髓鞘碱性蛋白、髓鞘相关糖蛋白、鞘糖脂、半乳糖酰基鞘氨醇和硫脂。同时,细胞周期调节因子p27kip1和转录因子Sox10的表达也有显著的下降。最为重要的是,p38抑制剂能够通过少突胶质细胞完全和不可逆地阻断背根神经节神经元的髓鞘形成,并阻止轴-胶粘附分子Caspr的轴膜组装。本实验结果提示p38

http://www.selleckchem.cn/products/dabrafenib-gsk2118436.html MAPKs在OLGs成熟和启动髓鞘形成的关键调控步骤中扮演了重要角色。
Objective To investigate the effect of interleukin-6(IL-6)on the human growth hormone(hGH)gene expression in a rat somatotropic pituitary cell line MtT/S.Methods The plasmids containing various lengths of hGH gene 5′-promoter fragments were constructed.Stably transfected MtT/S cells were created by cotransfecting the above plasmids and pcDNA3.1(+)with DMRIE-C transfection reagent.After the administration of these cells with IL-6 and/or various inhibitors of signaling transduction pathways,the luciferase activities in MtT/S cells lysis were assayed to demonstrate the effects of IL-6 on hGH gene promoter activity and possibly involved mechanism.Results The 103 U/mL IL-6 stimulated GH secretion and synthesis,and promoted the 5′-promoter activity of GH gene in stably transfected MtT/SGL cells with the action of 1.69 times above the control.Among inhibitors of signaling transduction pathways,mitogen-activated protein kinase kinase(MAPKK/MEK)inhibitor PD98059(40 μmol/L)and p38 mitogen-activated protein kinase(MAPK)inhibitor SB203580(5 μmol/L)completely blocked the stimulatory effect of IL-6.Western blot analysis further confirmed the activation of phosphorylated MEK and p38 MAPK in MtT/SGL cells.Neither over-expression of Pit-1 nor inhibition of Pit-1 expression affected IL-6 induction of hGH promoter activity.