目的了解基质金属蛋白酶抑制剂对肝癌生长和侵袭转移的影响及其机制。方法通过腹腔注射BB-94对二乙基亚硝胺建立的大鼠原发性肝癌模型进行治疗,观察BB-94对肝癌的生长和侵袭转移的抑制作用,并应用明胶酶谱法研究BB-94治疗后基质MMP-2和M...目的了解基质金属蛋白酶抑制剂对肝癌生长和侵袭转移的影响及其机制。方法通过腹腔注射BB-94对二乙基亚硝胺建立的大鼠原发性肝癌模型进行治疗,观察BB-94对肝癌的生长和侵袭转移的抑制作用,并应用明胶酶谱法研究BB-94治疗后基质MMP-2和MMP-9的表达情况及对其活性形式的影响;探讨BB-94影响肝癌生长和侵袭转移的机制。结果 BB-94对肿瘤生长、侵袭转移均有明显的抑制作用,治疗组与对照组肝脏肿瘤质量为(3.6±0.4)g vs(4.1±0.4)g(P<0.001);并能延长其生存期;对酶原形式的MMP-2和MMP-9无影响,而使MMP-2活性形式的表达量显著降低,治疗组和对照组分别为28.5±19.8 vs 42.8±20.1(P<0.05)。结论BB-94可通过降低活性形式MMP-2的表达来抑制肝细胞癌的生长和侵袭转移。展开更多
目的观察长期应用糖皮质激素对大鼠股骨头骨组织中骨保护素(osteoprotegerin,OPG)/NF-κB受体活化因子配基(receptor activator of NF-κB ligand,RANKL)-基质金属蛋白酶(matrix metalloproteinase,MMP)/基质金属蛋白酶组织抑制剂(tissu...目的观察长期应用糖皮质激素对大鼠股骨头骨组织中骨保护素(osteoprotegerin,OPG)/NF-κB受体活化因子配基(receptor activator of NF-κB ligand,RANKL)-基质金属蛋白酶(matrix metalloproteinase,MMP)/基质金属蛋白酶组织抑制剂(tissue inhibitor of matrix metalloproteinase,TIMP)系统的影响,探讨其导致股骨头缺血性坏死(avascular necrosis of femoral head,ANFH)的相关机制。方法健康SD大鼠40只,雌雄各半,体重250~300g;随机分为高、中、低剂量激素组和对照组,每组10只。高、中、低剂量激素组动物分别给予肌肉注射醋酸泼尼松龙25.0、12.5、7.0mg/kg,每周2次,共4周;对照组给予等量生理盐水。注射期间观察大鼠一般情况,于4周注射完毕后取各组大鼠左侧股骨头行组织学观察,鉴定骨坏死情况;取右侧股骨头骨组织提取总RNA,RT-PCR检测OPG、RANKL、MMP-2、MMP-9、TIMP-1、TIMP-2mRNA表达水平。结果注射醋酸泼尼松龙后高剂量激素组4只、中剂量激素组1只于第23~26天因饮食减少、体重下降最终致全身衰竭死亡。HE染色可见各激素组骨小梁和骨单位完整性不同程度破坏,形成不连续的骨碎片,部分骨陷窝内骨细胞消失,被炎性肉芽组织取代;对照组可见骨单位完整,板层围绕血管呈同心圆排列,大多数骨小梁陷窝内可见骨细胞。高、中、低剂量激素组及对照组ANFH发生率分别为83.3%(5/6)、66.7%(6/9)、30.0%(3/10)、0(0/10)。RT-PCR检测示,各激素组与对照组比较,OPG、TIMP-1、TIMP-2mRNA表达均降低,差异有统计学意义(P<0.05),并且随激素用量增加呈下降趋势;各激素组间OPG mRNA表达差异有统计学意义(P<0.05);中、低剂量激素组间TIMP-1、TIMP-2mRNA表达比较差异无统计学意义(P>0.05),但明显高于高剂量激素组(P<0.05)。各激素组与对照组比较,RANKL、MMP-2、MMP-9mRNA表达均增高,并且随激素用量增加呈上升趋势,其中高、中剂量激素组显著高于对照组(P<0.05);高、�展开更多
目的:探讨运动性心房损伤和纤维化发生过程中大鼠心房基质金属蛋白酶及其抑制剂的表达变化。方法:8周龄SD雄性大鼠48只,随机分为安静对照组(24只)和大强度运动组(24只),每组又分为8周组、12周组和16周组,每组8只。安静组正常饲养,大强...目的:探讨运动性心房损伤和纤维化发生过程中大鼠心房基质金属蛋白酶及其抑制剂的表达变化。方法:8周龄SD雄性大鼠48只,随机分为安静对照组(24只)和大强度运动组(24只),每组又分为8周组、12周组和16周组,每组8只。安静组正常饲养,大强度运动组分别进行8周、12周和16周的跑台运动,跑速为28 m/min,坡度为10°,每天运动1小时,每周5天。采用荧光定量PCR和Western Blot检测心肌基质金属蛋白酶-1(MMP-1)和基质金属蛋白酶抑制剂-1(TIMP-1)m RNA与蛋白的表达,并计算MMP-1/TIMP-1m RNA和蛋白比值。结果:与安静组相比,8周大强度运动组MMP-1 m RNA和蛋白的表达均显著性增加(P<0.05),12周大强度运动组MMP-1 m RNA和蛋白的表达具有增加趋势,16周大强度运动组MMP-1 m RNA和蛋白的表达具有降低趋势,但无明显差异。MMP-1 m RNA的表达随运动时间的延长具有逐渐降低趋势,16周大强度运动组显著低于8周大强度运动组(P<0.05);与安静组相比,8周大强度运动组TIMP-1的表达无明显差异,12周和16周大强度运动组TIMP-1 m RNA和蛋白的表达均出现显著性增加(P<0.01、P<0.05)。随运动时间的延长,TIMP-1 m RNA的表达逐渐增加,16周大强度运动组显著高于8周大强度运动组(P<0.05);MMP-1/TIMP-1 m RNA和蛋白的比值先升高后降低,16周大强度运动组MMP-1/TIMP-1 m RNA的比值显著低于安静对照组和8周大强度运动组(P<0.05)。结论:长期大强度运动导致大鼠心房MMP-1的表达先升高后降低,而TIMP-1的表达逐渐增加,MMP-1/TIMP-1的比例失调,可能是运动性心房损伤和纤维化发生的分子病理机制。展开更多
Small hairpin RNA (shRNA) was used to silence the HIF1α gene in human retinal pigment epithelial cells (RPE) under hypoxia in order to observe the effect of gene silencing on the expression of matrix metalloprote...Small hairpin RNA (shRNA) was used to silence the HIF1α gene in human retinal pigment epithelial cells (RPE) under hypoxia in order to observe the effect of gene silencing on the expression of matrix metalloproteinase tissue inhibitor 1 (TIMP1). By using chemical hypoxic inducer CoCl2 to mimic RPE hypoxic environment, shRNA against the targeting region of HIF1α mRNA sequence was synthesized by a method of in vitro transcription, and the HIF1α was interfered in RPE cultured under hypoxia (induced by 150 μmol/L CoCl2 ). RT-PCR was employed to detect the expression of HIF1α and TIMP1. The expression levels of HIF1α and TIMP1 were measured by using Western blotting. The results showed that after the RPE were transfected with specific shRNA against HIF1α mRNA, RT PCR revealed that under hypoxia, the efficacy of HIF1α gene silencing in RPE was 83.4 %. Western blotting revealed that the expression levels of HIF1α protein was dramatically dropped. In addition, RT-PCR results demonstrated that the expression of TIMP1 mRNA was decreased by 28.9 %, and the expression levels of TIMP1 protein were also significantly reduced by Western blotting. It was suggested that shRNA targeted against HIF1α mRNA could effectively silence the HIF1α gene, subsequently effectively inhibit the hypoxia-induced up-regulation of TIMP1.展开更多
文摘目的了解基质金属蛋白酶抑制剂对肝癌生长和侵袭转移的影响及其机制。方法通过腹腔注射BB-94对二乙基亚硝胺建立的大鼠原发性肝癌模型进行治疗,观察BB-94对肝癌的生长和侵袭转移的抑制作用,并应用明胶酶谱法研究BB-94治疗后基质MMP-2和MMP-9的表达情况及对其活性形式的影响;探讨BB-94影响肝癌生长和侵袭转移的机制。结果 BB-94对肿瘤生长、侵袭转移均有明显的抑制作用,治疗组与对照组肝脏肿瘤质量为(3.6±0.4)g vs(4.1±0.4)g(P<0.001);并能延长其生存期;对酶原形式的MMP-2和MMP-9无影响,而使MMP-2活性形式的表达量显著降低,治疗组和对照组分别为28.5±19.8 vs 42.8±20.1(P<0.05)。结论BB-94可通过降低活性形式MMP-2的表达来抑制肝细胞癌的生长和侵袭转移。
文摘目的观察长期应用糖皮质激素对大鼠股骨头骨组织中骨保护素(osteoprotegerin,OPG)/NF-κB受体活化因子配基(receptor activator of NF-κB ligand,RANKL)-基质金属蛋白酶(matrix metalloproteinase,MMP)/基质金属蛋白酶组织抑制剂(tissue inhibitor of matrix metalloproteinase,TIMP)系统的影响,探讨其导致股骨头缺血性坏死(avascular necrosis of femoral head,ANFH)的相关机制。方法健康SD大鼠40只,雌雄各半,体重250~300g;随机分为高、中、低剂量激素组和对照组,每组10只。高、中、低剂量激素组动物分别给予肌肉注射醋酸泼尼松龙25.0、12.5、7.0mg/kg,每周2次,共4周;对照组给予等量生理盐水。注射期间观察大鼠一般情况,于4周注射完毕后取各组大鼠左侧股骨头行组织学观察,鉴定骨坏死情况;取右侧股骨头骨组织提取总RNA,RT-PCR检测OPG、RANKL、MMP-2、MMP-9、TIMP-1、TIMP-2mRNA表达水平。结果注射醋酸泼尼松龙后高剂量激素组4只、中剂量激素组1只于第23~26天因饮食减少、体重下降最终致全身衰竭死亡。HE染色可见各激素组骨小梁和骨单位完整性不同程度破坏,形成不连续的骨碎片,部分骨陷窝内骨细胞消失,被炎性肉芽组织取代;对照组可见骨单位完整,板层围绕血管呈同心圆排列,大多数骨小梁陷窝内可见骨细胞。高、中、低剂量激素组及对照组ANFH发生率分别为83.3%(5/6)、66.7%(6/9)、30.0%(3/10)、0(0/10)。RT-PCR检测示,各激素组与对照组比较,OPG、TIMP-1、TIMP-2mRNA表达均降低,差异有统计学意义(P<0.05),并且随激素用量增加呈下降趋势;各激素组间OPG mRNA表达差异有统计学意义(P<0.05);中、低剂量激素组间TIMP-1、TIMP-2mRNA表达比较差异无统计学意义(P>0.05),但明显高于高剂量激素组(P<0.05)。各激素组与对照组比较,RANKL、MMP-2、MMP-9mRNA表达均增高,并且随激素用量增加呈上升趋势,其中高、中剂量激素组显著高于对照组(P<0.05);高、�
文摘目的:探讨运动性心房损伤和纤维化发生过程中大鼠心房基质金属蛋白酶及其抑制剂的表达变化。方法:8周龄SD雄性大鼠48只,随机分为安静对照组(24只)和大强度运动组(24只),每组又分为8周组、12周组和16周组,每组8只。安静组正常饲养,大强度运动组分别进行8周、12周和16周的跑台运动,跑速为28 m/min,坡度为10°,每天运动1小时,每周5天。采用荧光定量PCR和Western Blot检测心肌基质金属蛋白酶-1(MMP-1)和基质金属蛋白酶抑制剂-1(TIMP-1)m RNA与蛋白的表达,并计算MMP-1/TIMP-1m RNA和蛋白比值。结果:与安静组相比,8周大强度运动组MMP-1 m RNA和蛋白的表达均显著性增加(P<0.05),12周大强度运动组MMP-1 m RNA和蛋白的表达具有增加趋势,16周大强度运动组MMP-1 m RNA和蛋白的表达具有降低趋势,但无明显差异。MMP-1 m RNA的表达随运动时间的延长具有逐渐降低趋势,16周大强度运动组显著低于8周大强度运动组(P<0.05);与安静组相比,8周大强度运动组TIMP-1的表达无明显差异,12周和16周大强度运动组TIMP-1 m RNA和蛋白的表达均出现显著性增加(P<0.01、P<0.05)。随运动时间的延长,TIMP-1 m RNA的表达逐渐增加,16周大强度运动组显著高于8周大强度运动组(P<0.05);MMP-1/TIMP-1 m RNA和蛋白的比值先升高后降低,16周大强度运动组MMP-1/TIMP-1 m RNA的比值显著低于安静对照组和8周大强度运动组(P<0.05)。结论:长期大强度运动导致大鼠心房MMP-1的表达先升高后降低,而TIMP-1的表达逐渐增加,MMP-1/TIMP-1的比例失调,可能是运动性心房损伤和纤维化发生的分子病理机制。
文摘Small hairpin RNA (shRNA) was used to silence the HIF1α gene in human retinal pigment epithelial cells (RPE) under hypoxia in order to observe the effect of gene silencing on the expression of matrix metalloproteinase tissue inhibitor 1 (TIMP1). By using chemical hypoxic inducer CoCl2 to mimic RPE hypoxic environment, shRNA against the targeting region of HIF1α mRNA sequence was synthesized by a method of in vitro transcription, and the HIF1α was interfered in RPE cultured under hypoxia (induced by 150 μmol/L CoCl2 ). RT-PCR was employed to detect the expression of HIF1α and TIMP1. The expression levels of HIF1α and TIMP1 were measured by using Western blotting. The results showed that after the RPE were transfected with specific shRNA against HIF1α mRNA, RT PCR revealed that under hypoxia, the efficacy of HIF1α gene silencing in RPE was 83.4 %. Western blotting revealed that the expression levels of HIF1α protein was dramatically dropped. In addition, RT-PCR results demonstrated that the expression of TIMP1 mRNA was decreased by 28.9 %, and the expression levels of TIMP1 protein were also significantly reduced by Western blotting. It was suggested that shRNA targeted against HIF1α mRNA could effectively silence the HIF1α gene, subsequently effectively inhibit the hypoxia-induced up-regulation of TIMP1.