Objective We aimed to investigate whether magnetic stent has preventive effect on in-stent restenosis by observing expressions of matrix metalloproteinase (MMP)2, MMP9, tissue inhibitor of matrix metalloproteinase (TI...Objective We aimed to investigate whether magnetic stent has preventive effect on in-stent restenosis by observing expressions of matrix metalloproteinase (MMP)2, MMP9, tissue inhibitor of matrix metalloproteinase (TIMP)1 and TIMP2 after balloon angioplasty, bare and magnetic stent implantation in rabbits. Methods Rabbits underwent balloon angioplasty, bare and magnetic stent implantation in the left iliac arteries. The changes of MMPs and TIMPs were examined at various time points in the injured arteries using the methods of zymography, Western blot analysis, reverse transcription-polymerase chain reaction (RT-PCR) and morphometric analysis. Results Balloon angioplasty group (BA) and magnetic stent group (MS) showed lower intrinsic gelatinolytic activity and higher expression of TIMPs with less intimae hyperplasia;Whereas bare stent (BS) group exhibited higher intrinsic gelatinolytic activity and lower expression of TIMPs with significant intimae hyperplasia. Conclusion Magnetic stent probably has preventive effect on in-stent restenosis by changing intrinsic matrix metalloproteinases activity and expression of TIMPs.展开更多
Effects of genistein on invasion and matrix metalloproteinase activities were investigated in HT1080 human sarcoma cells.Invasion of HT1080 cells through reconstituted basement membrane was inh...Effects of genistein on invasion and matrix metalloproteinase activities were investigated in HT1080 human sarcoma cells.Invasion of HT1080 cells through reconstituted basement membrane was inhibited when the cells were treated with 100 μ mol/L and 200 μ mol/L genistein.At the same concentrations,genistein not only suppressed latent forms of matrix metalloprotinese 2 and 9(MMP 2 and MMP 9) to convert into active forms,but also increase dramatically the tissue inhibitor of metalloproteinase(TIMP 1) mRNA contents and reverse the imbalance of MMPs and TIMPs.However,expressions of MMP 2 and MMP 9 were not significantly affected.Suppression of MMP activation and increase of TIMP 1 expression will decrease matrix degradation by MMPs,and consequently inhibit invasions of the cells.These results emphasized the existence of the imbalance between MMPs and TIMPs in tumor invasion and metastasis formation.The value of genistein as a drug for antiinvasion and anti metastasis chemotherapy was suggested.展开更多
目的:观察黄芪、太子参对大鼠肾小球系膜细胞基质金属蛋白酶-2(matrix metalloproteinase-2,MMP-2)及基质金属蛋白酶抑制剂-2(tissue inhibitor of metalloproteinase-2,TIMP-2)-mRNA表达的影响。探讨黄芪、太子参对肾小球硬化的防治作...目的:观察黄芪、太子参对大鼠肾小球系膜细胞基质金属蛋白酶-2(matrix metalloproteinase-2,MMP-2)及基质金属蛋白酶抑制剂-2(tissue inhibitor of metalloproteinase-2,TIMP-2)-mRNA表达的影响。探讨黄芪、太子参对肾小球硬化的防治作用。方法:(1)应用血清药理学方法,制取中药的药理血清。(2)采用血管紧张素Ⅱ(angiotensinⅡ,AngⅡ)作为刺激因子,培养大鼠肾小球系膜细胞,使其发生增殖。(3)应用反转录多聚酶链反应技术(RT-PCR)观察各组间MMP-2及TIMP-2m-RNA表达的情况。结果:黄芪、太子参对TIMP-2有显著地抑制作用,与对照组比较差异有统计学意义(P<0.05)。对MMP-2的影响差异无统计学意义。结论:黄芪、太子参通过抑制TIMP-2的基因表达,从而达到延缓肾小球硬化的作用。展开更多
文摘Objective We aimed to investigate whether magnetic stent has preventive effect on in-stent restenosis by observing expressions of matrix metalloproteinase (MMP)2, MMP9, tissue inhibitor of matrix metalloproteinase (TIMP)1 and TIMP2 after balloon angioplasty, bare and magnetic stent implantation in rabbits. Methods Rabbits underwent balloon angioplasty, bare and magnetic stent implantation in the left iliac arteries. The changes of MMPs and TIMPs were examined at various time points in the injured arteries using the methods of zymography, Western blot analysis, reverse transcription-polymerase chain reaction (RT-PCR) and morphometric analysis. Results Balloon angioplasty group (BA) and magnetic stent group (MS) showed lower intrinsic gelatinolytic activity and higher expression of TIMPs with less intimae hyperplasia;Whereas bare stent (BS) group exhibited higher intrinsic gelatinolytic activity and lower expression of TIMPs with significant intimae hyperplasia. Conclusion Magnetic stent probably has preventive effect on in-stent restenosis by changing intrinsic matrix metalloproteinases activity and expression of TIMPs.
文摘Effects of genistein on invasion and matrix metalloproteinase activities were investigated in HT1080 human sarcoma cells.Invasion of HT1080 cells through reconstituted basement membrane was inhibited when the cells were treated with 100 μ mol/L and 200 μ mol/L genistein.At the same concentrations,genistein not only suppressed latent forms of matrix metalloprotinese 2 and 9(MMP 2 and MMP 9) to convert into active forms,but also increase dramatically the tissue inhibitor of metalloproteinase(TIMP 1) mRNA contents and reverse the imbalance of MMPs and TIMPs.However,expressions of MMP 2 and MMP 9 were not significantly affected.Suppression of MMP activation and increase of TIMP 1 expression will decrease matrix degradation by MMPs,and consequently inhibit invasions of the cells.These results emphasized the existence of the imbalance between MMPs and TIMPs in tumor invasion and metastasis formation.The value of genistein as a drug for antiinvasion and anti metastasis chemotherapy was suggested.
文摘目的:观察黄芪、太子参对大鼠肾小球系膜细胞基质金属蛋白酶-2(matrix metalloproteinase-2,MMP-2)及基质金属蛋白酶抑制剂-2(tissue inhibitor of metalloproteinase-2,TIMP-2)-mRNA表达的影响。探讨黄芪、太子参对肾小球硬化的防治作用。方法:(1)应用血清药理学方法,制取中药的药理血清。(2)采用血管紧张素Ⅱ(angiotensinⅡ,AngⅡ)作为刺激因子,培养大鼠肾小球系膜细胞,使其发生增殖。(3)应用反转录多聚酶链反应技术(RT-PCR)观察各组间MMP-2及TIMP-2m-RNA表达的情况。结果:黄芪、太子参对TIMP-2有显著地抑制作用,与对照组比较差异有统计学意义(P<0.05)。对MMP-2的影响差异无统计学意义。结论:黄芪、太子参通过抑制TIMP-2的基因表达,从而达到延缓肾小球硬化的作用。
