目的:探讨转化生长因子β1(TGF-β1)对大鼠心肌细胞肥大和凋亡的影响。方法:建立TGF-β1诱导的体外大鼠心肌细胞肥大模型。透射电镜观察心肌细胞形态。碘化丙啶(PI)染色标记法检测心肌细胞RNA含量。实时荧光定量PCR(Real time PCR)检测...目的:探讨转化生长因子β1(TGF-β1)对大鼠心肌细胞肥大和凋亡的影响。方法:建立TGF-β1诱导的体外大鼠心肌细胞肥大模型。透射电镜观察心肌细胞形态。碘化丙啶(PI)染色标记法检测心肌细胞RNA含量。实时荧光定量PCR(Real time PCR)检测心肌细胞胚心基因肌球蛋白重链β亚型(β-MHC)的表达。TdT-FragEL染色检测心肌细胞凋亡。Annexin/7AAD双染法、直接免疫荧光标记法经流式细胞仪检测心肌细胞凋亡率及心肌细胞中caspase-3水平。结果:TGF-β1刺激24 h后,心肌细胞β-MHC mRNA水平明显高于对照组(P<0.01);PI染色结果TGF-β1组RNA含量明显增高,并呈剂量依赖性(P<0.01)。TdT-FragEL染色观察,TGF-β1可增加心肌细胞凋亡率(P<0.01)。与对照组相比,TGF-β1可明显上调心肌细胞中caspase-3(P<0.01);TGF-β1诱导的心肌细胞凋亡率增加(P<0.01)。透射电镜观察TGF-β1可诱导心肌细胞肥大和凋亡。结论:TGF-β1可同时诱导心肌细胞肥大和凋亡,诱导凋亡可能与caspase-3有关。展开更多
目的:用金黄色葡萄球菌肠毒素A(SEA)和肠毒素B(SEB)干预幼年小鼠,观察它们对小鼠慢性哮喘气道炎症的影响以及对气道内相关细胞因子水平的调节作用。方法:实验组中BALB/c小鼠在出生后1周开始腹腔注射0.1 mL SEA或SEB(浓度1 mg/L),隔天注...目的:用金黄色葡萄球菌肠毒素A(SEA)和肠毒素B(SEB)干预幼年小鼠,观察它们对小鼠慢性哮喘气道炎症的影响以及对气道内相关细胞因子水平的调节作用。方法:实验组中BALB/c小鼠在出生后1周开始腹腔注射0.1 mL SEA或SEB(浓度1 mg/L),隔天注射,共7次。其它小组注射相同剂量生理盐水对照。BALB/c小鼠出生后4周建立哮喘模型,实验组和模型组分别在0、7和14 d用卵白蛋白(OVA)腹腔注射致敏,在28 d开始隔天OVA雾化激发哮喘,共7次,末次激发后24-48 h内取支气管肺泡灌洗液(BALF),进行嗜酸性粒细胞和总白细胞计数,其余BALF离心-70℃冻存检测细胞因子,固定肺组织做病理切片分析。结果:SEA组和SEB组小鼠肺组织炎症反应轻于模型组,BALF中嗜酸性粒细胞数量少于模型组(P<0.05);SEA、SEB组BALF中Th1细胞因子干扰素-γ(IFN-γ)高于模型组(P<0.05);而Th2细胞因子白细胞介素-4(IL-4)、白细胞介素-5(IL-5)和嗜酸性粒细胞趋化因子(eotaxin)均低于模型组(P<0.01)。结论:早期感染SEA、SEB可以减少小鼠慢性哮喘支气管肺泡灌洗液中嗜酸性粒细胞的数量,可能通过调节Th1/Th2细胞因子比值减轻气道中的哮喘炎症反应。展开更多
A Review] CD4+ T cells can be divided into Th1/Th2 subsets. Th1/Th2 imbalance participates many disease processes. A stable surface marker distinguishing Th1 and Th2 will greatly facilitate the investigation of Th1/Th...A Review] CD4+ T cells can be divided into Th1/Th2 subsets. Th1/Th2 imbalance participates many disease processes. A stable surface marker distinguishing Th1 and Th2 will greatly facilitate the investigation of Th1/Th2 interaction.Several surface molecules have been reported to be differentialy expressed between Th1 and Th2 cells.LAG-3,active ligands for P- and E-selectin ,IL-18R, IL-12Rβ2,CC chemokine receptor (CCR5) were shown to be dominantly expressed on Th1 cells,whereas expression of CD30,ST2L,CRTH2,CCR3,CCR4 was reported to be preferential to Th2 cells. In this review, several surface molecules were mainly discussed.展开更多
文摘目的:探讨转化生长因子β1(TGF-β1)对大鼠心肌细胞肥大和凋亡的影响。方法:建立TGF-β1诱导的体外大鼠心肌细胞肥大模型。透射电镜观察心肌细胞形态。碘化丙啶(PI)染色标记法检测心肌细胞RNA含量。实时荧光定量PCR(Real time PCR)检测心肌细胞胚心基因肌球蛋白重链β亚型(β-MHC)的表达。TdT-FragEL染色检测心肌细胞凋亡。Annexin/7AAD双染法、直接免疫荧光标记法经流式细胞仪检测心肌细胞凋亡率及心肌细胞中caspase-3水平。结果:TGF-β1刺激24 h后,心肌细胞β-MHC mRNA水平明显高于对照组(P<0.01);PI染色结果TGF-β1组RNA含量明显增高,并呈剂量依赖性(P<0.01)。TdT-FragEL染色观察,TGF-β1可增加心肌细胞凋亡率(P<0.01)。与对照组相比,TGF-β1可明显上调心肌细胞中caspase-3(P<0.01);TGF-β1诱导的心肌细胞凋亡率增加(P<0.01)。透射电镜观察TGF-β1可诱导心肌细胞肥大和凋亡。结论:TGF-β1可同时诱导心肌细胞肥大和凋亡,诱导凋亡可能与caspase-3有关。
基金国家自然科学基金! (No 3980 0 0 5 9)广东省自然科学基金! (No 980 46 0 )+1 种基金广东省医学科研课题!(A19982 33)广州市科委基础项
文摘A Review] CD4+ T cells can be divided into Th1/Th2 subsets. Th1/Th2 imbalance participates many disease processes. A stable surface marker distinguishing Th1 and Th2 will greatly facilitate the investigation of Th1/Th2 interaction.Several surface molecules have been reported to be differentialy expressed between Th1 and Th2 cells.LAG-3,active ligands for P- and E-selectin ,IL-18R, IL-12Rβ2,CC chemokine receptor (CCR5) were shown to be dominantly expressed on Th1 cells,whereas expression of CD30,ST2L,CRTH2,CCR3,CCR4 was reported to be preferential to Th2 cells. In this review, several surface molecules were mainly discussed.
