特异性p38蛋白激酶抑制剂SB203580对哮喘小鼠气道炎症和Th1/Th2类细胞因子变化的影响

目的:探讨特异性p38蛋白激酶(p38MAPK)抑制剂SB203580对哮喘小鼠气道炎症和Th1／Th2类细胞因子(IFN-γ／IL-4)变化的影响。方法:BALB／c小鼠30只随机分成3组:正常对照组、哮喘模型组和SB203580干预组。采用酶联免疫吸附法(ELISA)检测支气管肺泡灌洗液(BALF)中IL-4和IFN-γ含量,并观察BALF中炎症细胞和肺组织病理学改变。结果:与正常对照组比较,哮喘模型组小鼠BALF中炎症细胞计数和IL-4水平升高而IFN-γ水平降低(P<0.01);与哮喘模型组比较,SB203580干预组小鼠BALF中炎症细胞计数和IL-4水平明显降低,IFN-γ水平明显上升(P<0.01),肺组织病理学改变显著减轻。结论:SB203580能抑制哮喘小鼠的气道炎症反应,纠正IFN-γ／IL-4平衡的失调。     

地塞米松抑制哮喘大鼠肺组织p38蛋白激酶的表达

目的:探讨支气管哮喘大鼠肺组织p38蛋白激酶(p38 MAPK)表达的变化以及地塞米松对其影响.方法:复制大鼠哮喘模型,随机分成3组:正常对照组、哮喘对照组和地塞米松(DEX)干预组.分别采用酶联免疫吸附法(ELISA)和蛋白质印迹检测支气管肺泡灌洗液(BALF)IL-5含量和肺组织磷酸化p38 MAPK表达的变化,并观察气道阻力、BALF中EOS计数以及肺组织病理学变化.结果:哮喘对照组大鼠肺组织磷酸化p38 MAPK表达水平及气道阻力、BALF中IL-5含量和EOS计数均较正常对照组显著增加(P＜0.01);DEX干预组上述指标较哮喘对照组显著降低(P＜0.01),肺组织病理学损伤程度明显减轻.肺组织磷酸化p38 MAPK表达水平与气道阻力、BALF中IL-5含量和EOS计数之间分别呈显著正相关(r=0.77、0.63、0.65,P＜0.01).结论:p38 MAPK可能参与了支气管哮喘的发病过程.DEX对哮喘的治疗作用至少部分与抑制磷酸化p38 MAPK的表达有关.     

黄芪注射液对哮喘大鼠p38蛋白激酶和白细胞介素-5表达的影响

目的：探讨黄芪注射液对哮喘大鼠p38蛋白激酶（p38 MAPK）和白细胞介素-5（IL-5）表达的影响。方法：应用鸡卵清蛋白（OVA）腹腔注射致敏和反复超声雾化吸入复制大鼠哮喘模型。40只大鼠随机分成5组：正常对照组,哮喘模型组和黄芪注射液低、中、高剂量组（2.5、5.0、10.0mL/kg）。分别采用酶联免疫吸附法（ELISA）、原位分子杂交方法和蛋白质印迹检测支气管肺泡灌洗液（BALF）IL-5含量、肺组织IL-5 mRNA和磷酸化p38 MAPK表达的变化,并观察BALF中炎症细胞计数、分类以及肺组织病理学变化。结果：哮喘模型组大鼠BALF中炎症细胞计数、IL-5含量和肺组织中IL-5 mRNA及磷酸化p38 MAPK表达均较正常对照组显著增加（P〈0.01）;黄芪干预组的上述改变较哮喘模型组显著降低（P〈0.01）,肺组织病理学损伤程度明显减轻,黄芪注射液低、中、高剂量组之间差异无统计学意义。肺组织磷酸化p38 MAPK表达水平与BALF中嗜酸性粒细胞（EOS）计数和IL-5、IL-5 mRNA含量之间分别呈显著正相关（r=0.62、0.69、0.74,P〈0.01）。结论：p38 MAPK可能参与了支气管哮喘的发病过程。黄芪对哮喘的治疗作用可能部分与抑制p38 MAPK的磷酸化活化、降低炎症介质释放、减轻炎症细胞浸润有关。     

阿里红调控MAPK/NF-κB信号通路对过敏性哮喘小鼠的影响及作用机制

目的:探讨阿里红多糖(FOPS)和阿里红醇提物(FOEE)对卵清白蛋白(OVA)诱导的过敏性哮喘小鼠模型的干预作用及潜在机制。方法:将72只雌性BALB/c小鼠随机分成9组,每组8只,分为正常组(Control),OVA诱导的过敏性哮喘模型组(OVA),阳性对照组(桂龙咳喘宁,Guilong),FOPS低、中、高剂量组(50,100,200 mg·kg^-1),FOEE低、中、高剂量组(50,100,200 mg·kg^-1)。观察并比较小鼠体质量变化、肺组织病理学变化;测定各组小鼠支气管肺泡灌洗液(BALF)中炎症细胞数量、IL-4、IL-5及TNF-α的含量;测定各组小鼠肺组织中磷酸化p38 MAPK(p-p38 MAPK)和磷酸化NF-κB p65(p-NF-κB p65)蛋白表达。结果:模型组小鼠BALF中炎症总细胞数量、嗜酸性粒细胞、中性粒细胞、淋巴细胞和单核细胞的数量,BALF中IL-4、IL-5和TNF-α的含量,肺组织p-p38 MAPK、Caspase-1、p-IκBα和p-NF-κB p65蛋白表达均明显高于正常组(P<...     

黄芪多糖抑制NF-κB/MAPK信号通路和改善哮喘大鼠气道炎症的作用

目的观察黄芪多糖(astragalus polysaccharide,APS)对哮喘大鼠气道炎症及NF-κB/MAPK信号通路的影响。方法采用卵蛋白(ovalbumin,OVA)致敏法制备哮喘模型并予以药物治疗。观察支气管灌洗液(bronchoalveolar lavage fluid,BALF)中炎症细胞分类计数、肺组织病理变化、肺泡Ⅰ型上皮超微结构变化;测定肺组织NF-κB p65、磷酸化NF-κB p65(p-NF-κB p65)、磷酸化IκBα(p-IκBα)、ERK1/2、磷酸化ERK1/2(p-ERK1/2)、JNK、磷酸化JNK(p-JNK)、p38 MAPK、磷酸化p38 MAPK(p-p38 MAPK)、IL-1β、IL-4、IL-5、IL-6及IL-13含量的变化。结果与正常组比较,OVA致敏明显升高哮喘组炎症细胞数量、增强NF-κB/MAPK信号通路活性。APS可改善哮喘大鼠气道炎症、肺Ⅰ型上皮损伤,并明显抑制NF-κB/MAPK信号通路活性。结论 APS改善哮喘大鼠气道炎症、细胞损伤的机制可能与抑制NF-κB/MAPK信号通路有关。     

川贝母对哮喘模型小鼠气道炎症及ERK/MAPK信号通路的影响

目的:考察川贝母对哮喘模型小鼠气道炎症及细胞外信号调节激酶(ERK)/丝裂原活化蛋白激酶(MAPK)信号通路的影响,探讨其治疗哮喘的可能机制。方法:以卵蛋白致敏小鼠建立哮喘模型。将造模成功的40只小鼠随机分为模型组(灌胃0.5%羧甲基纤维素)、阳性对照组(腹腔注射0.5 mg/kg地塞米松)和川贝母低、高剂量组(灌胃9.0、18.0 mg/kg),每组10只;另选10只正常小鼠作为正常组(灌胃0.5%羧甲基纤维素)。每天给药1次,连续28 d。给药结束后,对小鼠支气管肺泡灌洗液(BALF)中总细胞和分类细胞(中性粒细胞、巨噬细胞、淋巴细胞和嗜酸性粒细胞)进行计数;光镜下观察小鼠支气管平滑肌病理组织形态,并进行炎症评分;酶联免疫吸附法测定肺组织中ERK、磷酸化ERK(p-ERK),p38 MAPK、磷酸化p38 MAPK(p-p38 MAPK)活性;Western blot法测定肺组织中ERK、p-ERK、p38 MAPK、p-p38 MAPK蛋白表达;实时荧光定量聚合酶链式反应法测定肺组织中ERK、p38 MAPK m RNA表达。结果:与正常组比较,模型组小鼠BALF中总细胞计数、分类细胞计数、炎症评分和肺组织中p-ERK、p-p38 MAPK活性均显著升高(P<0.01),肺组织中p-ERK、p-p38 MAPK蛋白表达以及ERK、p38 MAPK m RNA表达均显著增强(P<0.01);与模型组比较,各给药组小鼠上述指标均显著改善(P<0.05或P<0.01)。结论:川贝母可改善哮喘模型小鼠气道炎症,其机制可能与抑制ERK/MAPK信号通路的激活有关。     

p38MAPK对内毒素致大鼠急性肺损伤的保护

目的 研究p38丝裂原活化蛋白激酶(p38MAPK)在内毒素引起急性肺损伤中的作用.方法 60只SD大鼠随机分生理盐水(NS)组、内毒素(LPS)组、SB203580+LPS(SB+LPS)组和SB203580+NS(SB+NS)组.ELISA法检测不同时间点大鼠支气管肺泡灌洗液(BALF)中肿瘤坏死因子(TNF)-α和白细胞介素(IL)-6浓度,HE染色检测肺组织病理学变化,Western blot法检测肺组织中磷酸化p38MAPK、核因子-kB(NF-kB)、p65和NF-kB抑制蛋白(IkBa)的表达.结果 LPS组大鼠BALF中TNF-α、IL-6的浓度明显升高(P＜0.05),肺组织破坏明显.磷酸化p38MAPK及胞核中NF-αB 065表达显著增多,胞浆中IkBa表达显著减少.SB+LPS组肺组织损伤程度轻,BALF中TNF-α、IL-6的释放显著受抑(P＜0.01),肺组织NF-kB活化及胞浆中IkBα鼬的降解均明显受抑(P＜0.01).结论 p38MAPK在LPS诱导的急性肺损伤中发挥重要作用,p38MAPK可能参与NF-kB的活化过程.     

蒙药五味沙棘散对吸烟致小鼠肺部炎症的改善作用及机制研究

目的:研究蒙药五味沙棘散(WSP)对吸烟所致小鼠肺部炎症的改善作用及其机制。方法:将30只ICR小鼠随机分为空白组(生理盐水)、模型组(生理盐水)和WSP组(2 g/kg)。模型组和WSP组小鼠采用被动吸烟法复制肺部炎症损伤模型,并于造模的同时每天ig相应药物1次,连续28 d。给药结束后,采用酶联免疫吸附法检测小鼠肺泡灌洗液(BALF)中肿瘤坏死因子α(TNF-α)、白细胞介素1β(IL-1β)、IL-6和IL-10水平;苏木精-伊红染色后光镜下观察小鼠肺组织病理变化;Western blot法检测小鼠肺组织中细胞外信号调节蛋白激酶1/2(ERK1/2)、磷酸化ERK1/2(p-ERK1/2)、p38丝裂原活化蛋白激酶(p38 MAPK)、磷酸化p38 MAPK(p-p38 MAPK)、核因子κB p65(NF-κB p65)和磷酸化NF-κB p65(p-NF-κB p65)蛋白表达。结果:与空白组比较,模型组小鼠BALF中TNF-α、IL-1β和IL-6水平明显升高(P<0.01),肺组织发生明显炎症病变,肺组织中p-ERK1/2、p-p38 MAPK、pNF-κB p65蛋白表达水平明显升高(P<0.01)。与模型组比较,WSP组大鼠BALF中TNF-α、IL-1β水平明显降低(P<0.05),肺组织炎症损伤明显改善,肺组织中p-p38 MAPK和p-NF-κB p65蛋白表达水平明显降低(P<0.05)。结论:WSP可能通过阻断p38MAPK、NF-κB p65蛋白的磷酸化来抑制炎症因子TNF-α和IL-6的高表达,从而发挥其对吸烟所致小鼠肺部炎症损伤的改善作用。     

丝裂原活化蛋白激酶抑制剂对急性肺损伤影响

目的探讨p38MAPK抑制剂SB203580对大鼠急性肺损伤影响。方法采用LPS建立SD大鼠急性肺损伤模型，随机分为对照组、LPS组、SB203580组。造模后注射p38MAPK抑制剂SB203580，在1h、3h、6h及12h时，剖杀大鼠，观察肺组织病理改变，ELISA法测血清中的TNF—α及IL-6；免疫组化检测肺组织中的p38MAPK及其磷酸化-p38MAPK。结果注射LPS后，SB203580治疗组较LPS组血清中的TNF—α及IL-6显著减少（P〈0．05 or 0.01）；肺组织中的磷酸化-p38MAPK的表达显著减轻，而p38丝裂原活化蛋白激酶未明显减轻。结论p38MAPK抑制剂SB203580可减轻血清中的TNF-α及IL-6和肺组织中的磷酸化-p38MAPK的表达，从而减轻LPS诱导的急性肺损伤。     

黄芪多糖对哮喘小鼠气道炎症启动因子TSLP和DCs表达的影响

摘要：目的 研究黄芪多糖(APS)对支气管哮喘模型小鼠气道上皮中胸腺间质淋巴细胞生成素(thymic stromal lymphopoietin,TSLP)和树突状细胞(dendritic cell,DCs)表达的影响。方法 饲养雌性BALB/c小鼠30只,随机将其分为对照 组、哮喘模型组和黄芪多糖组,各组采取相应的干预措施。通过支气管哮喘激发试验、肺组织病理学和酶联免疫吸附试验 (ELISA)评价哮喘模型造模是否成功;肺组织中TSLP mRNA的相对表达水平采用实时荧光定量PCR(qRT-PCR)检测;蛋白免疫印 迹实验(Western blot)检测肺组织中TSLP蛋白的表达;流式细胞术检测支气管肺泡灌洗液(bronchoalveolar lavage fluid,BALF)中 DCs表面CD40、CD80和CD86的表达水平。结果 哮喘模型组小鼠气道反应性增高和肺组织HE染色结果均为哮喘的典型表现且 哮喘模型组BALF中IL-13、IL-5和IL-4的表达水平显著高于黄芪多糖组和对照组(P<0.001);黄芪多糖组和对照组小鼠肺组织中 TSLP mRNA的表达水平与哮喘模型组相比较低(P<0.001),TSLP mRNA的表达水平在黄芪多糖组与对照组之间差异无统计学意 义(P>0.05);黄芪多糖组与对照组小鼠肺组织中TSLP蛋白的表达与哮喘模型组相比较弱;黄芪多糖组与对照组BALF中DCs表面 CD54、CD80、CD86的表达明显低于哮喘模型组(P<0.001),黄芪多糖组与对照组之间差异无统计学意义(P>0.05)。结论 黄芪 多糖可明显抑制哮喘模型小鼠气道上皮细胞TSLP水平和DCs表面CD54、CD80、CD86的表达,并减轻气道炎症反应。     

p38 MAPK and MMP-9 cooperatively regulate mucus overproduction in mice exposed to acrolein fog

ObjectiveTo evaluate the role of p38 mitogen-activated protein kinase (MAPK) on mice airway inflammation, mucus production and the possible cross-talk between p38 MAPK and matrix metalloproteinase-9 (MMP-9) in mucin protein synthesis.MethodsMice were exposed to 4.0 ppm of acrolein for 21 days with daily intraperitoneal injection of SB203580, a specific inhibitor of p38 MAPK. In control mice, sterile saline was administered instead. On days 7 and 21, mice were sacrificed to examine airway inflammation and mucus production by BALF cell counts, cytokine ELISA, and H&;E and AB-PAS staining. The mRNA and protein levels of Muc5ac, p38 MAPK and MMP-9 in the lung were determined by RT-PCR, immunohistochemistry and Western blotting analysis. MMP-9 activity was measured by gelatin zymography.ResultsBoth the numbers of inflammatory cells and mucus-secreting goblet cells were significantly increased in the airways of mice exposed to acrolein as compared to the control mice. Acrolein-increased phosphorylation of p38 MAPK was significantly reduced by SB203580. The airway inflammation and goblet cell hyperplasia after acrolein challenge were also attenuated by SB203580 administration. Moreover, SB203580 treatment decreased the acrolein-induced increase of Muc5ac and MMP-9 expression and MMP-9 activity in airway epithelium.ConclusionsThe results indicate an important role of p38 MAPK in acrolein-induced airway inflammation and mucus hypersecretion in mice. The cooperation of p38 and MMP-9 may contribute to the mucin overproduction after inflammatory challenge.     

钩藤碱固体脂质纳米粒对哮喘小鼠miR-155/p38 MAPK轴的影响

目的　观察钩藤碱固体脂质纳米粒（Rhy-SLN）对支气管哮喘模型小鼠微小RNA-155（miR-155）/p38丝裂原活化蛋白激酶（p38 MAPK）轴的影响。方法　15只BALB/c小鼠随机均分为正常对照组、模型组和Rhy-SLN组。Rhy-SLN组小鼠行鼻内氢氧化铝致敏操作前以Rhy-SLN（50 mg/kg）灌胃;正常对照组和模型组给予等量生理盐水。干预结束后,肺泡灌洗液涂片观察嗜酸粒细胞的数量;HE染色观察小鼠肺组织病理改变情况;酶联免疫吸附试验（ELISA）法检测小鼠免疫球蛋白E（IgE）、白细胞介素（IL）-13水平;羟脯氨酸测试盒检测小鼠肺组织中羟脯氨酸水平;Werstern blot检测小鼠肺组织（α-SMA）、胶原蛋白Ⅰ（collagen Ⅰ）、p38 MAPK、p-p38 MAPK蛋白表达水平;荧光定量聚合酶链反应（qPCR）检测小鼠肺组织miR-155 mRNA表达水平。结果　与模型组比较,Rhy-SLN组可以降低哮喘小鼠肺泡灌洗液中嗜酸粒细胞的数目、血清中IgE和肺泡灌洗液中IL-13的水平（P＜0.05）;减轻肺组织炎性细胞浸润;降低肺组织中α-SMA、collagenⅠ、羟脯氨酸和p-p38 MAPK的表达（P＜0.05）;上调小鼠肺组织中miR-155的表达水平（P＜0.05）。结论　Rhy-SLN可缓解小鼠哮喘,其机制可能与调节miR-155/p38 MAPK轴,降低气道的炎症反应有关。     

The proinflammatory cytokines interleukin-1beta and tumor necrosis factor-alpha activate serotonin transporters.

Proinflammatory cytokines and serotonergic homeostasis have both been implicated in the pathophysiology of major psychiatric disorders. We have demonstrated that activation of p38 mitogen-activated protein kinase (MAPK) induces a catalytic activation of the serotonin transporter (SERT) arising from a reduction in the SERT Km for 5-hydroxytryptamine (5-HT). As inflammatory cytokines can activate p38 MAPK, we hypothesized that they might also activate neuronal SERT. Indeed, Interleukin-1beta (IL-1beta) and tumor necrosis factor alpha (TNF-alpha) stimulated serotonin uptake in both the rat embryonic raphe cell line, RN46A, and in mouse midbrain and striatal synaptosomes. In RN46A cells, IL-1beta stimulated 5-HT uptake in a dose- and time-dependent manner, peaking in 20 min at 100 ng/ml. This was abolished by IL-1ra (20 ng/ml), an antagonist of the IL-1 receptor, and by SB203580 (5 microM), a p38 MAPK inhibitor. TNF-alpha also dose- and time-dependently stimulated 5-HT uptake that was only partially blocked by SB203580. Western blots showed that IL-1beta and TNF-alpha activated p38 MAPK, in an SB203580-sensitive manner. IL-1beta induced an SB203580-sensitive decrease in 5-HT Km with no significant change in Vmax. In contrast, TNF-alpha stimulation decreased 5-HT Km and increased SERT Vmax. SB203580 selectively blocked the TNF-alpha-induced change in SERT Km. In mouse midbrain and striatal synaptosomes, maximal stimulatory effects on 5-HT uptake occurred at lower concentrations (IL-1beta, 10 ng/ml; TNF-alpha, 20 ng/ml), and over shorter incubation times (10 min). As with RN46A cells, the effects of IL-1beta and TNF-alpha were completely (IL-1beta) or partially (TNF-alpha) blocked by SB203580. These results provide the first evidence that proinflammatory cytokines can acutely regulate neuronal SERT activity via p38 MAPK-linked pathways.     

槐定碱对LPS诱导的RAW264.7巨噬细胞p38、iNOS表达的影响

目的探讨槐定碱(sophoridine,SRI)在内毒素导致的炎症反应中的作用。方法采用LPS诱导的RAW264.7巨噬细胞建立细胞炎症反应模型,实验细胞分为5组(n=6):空白对照组、LPS组、槐定碱组、SB203580组、SB203580+槐定碱组,利用反转录聚合酶链反应(RT-PCR)技术检测RAW264.7巨噬细胞p38 mRNA表达量;利用Western blot技术检测RAW264.7巨噬细胞p-p38与iNOS蛋白的表达量。结果槐定碱组与LPS组比较p-p38蛋白表达量和p38 mRNA表达量降低,但高于空白对照组(P<0.01),表明槐定碱可以抑制LPS诱导的RAW264.7巨噬细胞p-p38蛋白表达和p38 mRNA表达量;与LPS组比较,槐定碱组iNOS蛋白表达量降低,但高于空白对照组(P<0.01),SB203580+槐定碱组iNOS蛋白表达量低于槐定碱组和SB203580组(P<0.01),表明槐定碱可以抑制LPS诱导的RAW264.7巨噬细胞P38MAPK信号通路下游iNOS蛋白表达,并且与SB203580有协同作用。结论槐定碱可以通过抑制p38MAPK位点而下调p-p38、iNOS蛋白表达而发挥抗炎作用。     

Role of p38 mapk on the down-regulation of matrix metallo-proteinase-9 expression in rat astrocytes

In spite of their pathophysiological importance in neuro-inflammatory diseases, little is known about the signal transduction pathways that lead to the induction of matrix metalloproteinases (MMPs) in the central nervous system. We reported previously that lipopolysaccharide (LPS) induced MMP-9 expression through ERK1/2 pathway in rat primary astrocytes (Glia 41:15-24, 2003). Here, we investigated the role of other MAPK pathways, including p38 and JNK/SAPK, on the regulation of MMP-9 expression in LPS-stimulated rat primary astrocytes. LPS activated both p38 and JNK in astrocytes. Treatment with a specific p38 MAPK inhibitor SB203580, but not JNK inhibitor SP600125, increased the LPS-stimulated MMP-9 expression in a concentration-dependent manner. Anti-inflammatory cytokines, including IFN-gamma and IL-4, activated p38 MAPK and decreased MMP-9 production in LPS-stimulated astrocytes. When p38 MAPK activation was blocked by SB203580, the inhibitory effects of these cytokines on MMP-9 induction were abolished. Finally, direct injection of SB203580 into the lateral ventricle of rat brain increased the LPS-induced MMP-9 activity in cerebral cortex. Altogether, these results suggest that p38 activation down-regulates the inflammatory stimulation-induced overexpression of MMP-9, both in primary astrocytes and in cerebral cortex. The elaborate interplay between ERK1/2 and p38 pathways provides a more sophisticated mechanism for regulating MMP-9 activity in neuroinflammatory diseases.     

黄芪多糖在未成年大鼠心肌缺血再灌注炎性损伤中的作用

目的：研究黄芪多糖在未成年大鼠心肌缺血再灌注炎性损伤中的作用。方法：1周龄雄性SD大鼠随机分为5组,假手术组（S组）、缺血再灌注组（I/R组）、黄芪多糖组（40 mg·kg^-1,APS组、p38MAPK阻断剂SB203580组（5 mg·kg^-1,SB组）,APS+SB203580组（APS 40 mg·kg^-1+SB203580 5 mg·kg^-1,APS+SB组） ,给药20 d后,进行冠状动脉左前降支结扎60 min后恢复血流再灌注120 min,经眼眶采血后处死大鼠。ELISA法和Western-blot法分别测定外周血和心肌组织中TNF-α、NF-κB、p38MAPK及p-p38MAPK蛋白表达。结果：在外周血和心肌组织中,与S组比较,I/R组、APS组、SB组、及APS+SB组中TNF-α、NF-κB、p-p38MAPK表达水平均明显升高（P值均小于0.05）;与I/R组比较,APS组、SB组及黄芪APS+SB组中TNF-α、NF-κB和p-p38MAPK表达水平明显降低（P值均小于0.05）。APS+SB组对TNF-α、NF-κB、和p-p38的蛋白表达抑制作用要显著强于APS组的抑制作用（P值均小于0.05）。结论：黄芪多糖和p38MAPK阻断剂（SB203580）均能够有效改善未成年大鼠的心肌缺血再灌注损伤时的炎症反应,黄芪多糖和SB203580联用可以明显抑制TNF-α和NF-κB的表达,抑制p38MAPK信号通路,具有抑制心肌缺血再灌注损伤的协同作用。     

FTY-720通过TGF-β1/P38 MAPK/NF-κB信号通路对小鼠肺纤维化模型的影响

目的探讨FTY-720对博来霉素诱导的小鼠肺纤维化的影响及其作用机制。方法将40只无特定病原体级健康雄性Balb/c小鼠随机分为对照组、博来霉素组、生理盐水+FTY-720对照组、博来霉素+FTY-720组,每组各5只,在7天、14天处死小鼠,共8组。应用HE染色和Masson染色观察肺组织炎症及肺纤维化情况;通过瑞士-吉姆萨染色计数支气管肺泡灌洗液细胞;BCA法测定BALF蛋白含量;ELISA方法检测BALF上清液中炎症因子IL-1β、TNF-α的表达水平;免疫组织化学法检测肺组织中COL1A1的表达水平;Western blot方法检测TGF-β1、p-P38 MAPK和NF-κB表达水平的变化。结果FTY-720显著降低BLM诱导增加的小鼠肺组织细胞外胶原沉积;减少小鼠肺组织BALF中IL-1β和TNF-α表达水平,和蛋白质含量、细胞数;FTY-720抑制TGF-β1活性与P38 MAPK的磷酸化,进而抑制NF-κB的表达与活化。结论FTY-720通过抑制TGF-β1/P38 MAPK/NF-κB信号通路,进而抑制博来霉素诱导小鼠的肺纤维化。     

Role of mitogen-activated protein kinase family in serum-induced leukaemia inhibitory factor and interleukin-6 secretion by bone marrow stromal cells

1: In the haematopoietic microenvironment, bone marrow stromal cells play an important role in regulating haematopoiesis by expressing various cytokines, including leukaemia inhibitory factor (LIF) and interleukin-6 (IL-6). However, the intracellular signal that regulates cytokine secretion in bone marrow stromal cells has not been determined. The aim of this study was to evaluate the role of mitogen-activated protein kinase (MAPK) family in serum-induced secretion of LIF and IL-6 by bone marrow stromal cells. 2: Transformed human bone marrow stromal cells (HS-5) were stimulated with foetal calf serum (FCS) to produce LIF and IL-6. FCS also induced activation of extracellular signal-regulated kinase (ERK), p38 MAPK and c-Jun NH(2)-terminal kinase (JNK). 3: Both PD98059 (MAPK/ERK kinase inhibitor) and SB203580 (p38 MAPK inhibitor) attenuated FCS-induced LIF protein production and gene expression. SB203580 decreased IL-6 production and gene expression, but PD98059 had no effect on IL-6 production and gene expression. 4: Expression of a dominant-negative mutant form of JNK1 that blocked FCS-induced JNK activity had no effect on protein production and gene expression of these cytokines. 5: These findings demonstrate that both ERK and p38 MAPK are involved in FCS-induced LIF secretion, whereas only p38 MAPK is important for IL-6 secretion, and that FCS-induced activation of JNK has no effect on the production of LIF and IL-6. We conclude that, in spite of their similar biological effects, they are differentially regulated at the level of MAPK activity in bone marrow stromal cells.