白细胞介素-10对急性心肌梗死后细胞外基质重构影响的实验研究

目的 观察白细胞介素-10(IL-10)对大鼠急性心肌梗死后心肌基质金属蛋白酶(MMP)-2、9,金属蛋白酶组织抑制因子(TIMP)-1表达及胶原代谢的作用,探讨其对急性心肌梗死后心肌基质重构的影响.方法 18只大鼠随机分为假手术组、MI/AAV2转染组作为对照和MI/AAV2-IL-10转染组,每组6只.结扎大鼠左冠状动脉前降支建立急性心肌梗死动物模型,同时应用基因重组2型腺相关病毒(AAV-2)携带IL-10基因转染心肌组织.RT-PCR和ELISA观察心肌IL-10 mRNA和蛋白的表达.逆转录聚合酶链反应、免疫印迹法、明胶酶谱、免疫组化检测转染后心肌组织表达MMP-2、9,TIMP-1,Ⅰ、Ⅲ型胶原水平的变化.结果 心肌梗死5 d后,MI/AAV2-IL-10组检测到IL-10 mRNA和蛋白的表达;MI/AAV2组较假手术组心肌MMP-2、9,Ⅰ、Ⅲ型胶原表达明显升高;而MI/AAV2-IL-10组较MI/AAV2组梗死心肌各部位MMP-2、9表达减少,TIMP-1表达升高,其中,梗死边缘区的MMP-2表达降低14.6%(P＜0.01),MMP-9降低24.7%(P＜0.01),TIMP-1升高73.1%(P＜0.01),Ⅰ、Ⅲ型胶原表达分别下降了47.6%(P＜0.01)、23.6%(P＜0.05),Ⅰ/Ⅲ型胶原比值下降.结论 IL-10通过对MMP/TIMP的作用,改善大鼠急性心肌梗死后心肌胶原沉积和组织重构.     

1,25-二羟维生素D3对人成骨细胞基质金属蛋白酶及其抑制因子的作用

目的　研究 1, 25 二羟维生素D3 [ 1α, 25 (OH)2D3 ]对人成骨细胞基质金属蛋白酶(MMP) 1、MMP 2、膜型基质金属蛋白酶 1 (MT1 MMP)、基质金属蛋白酶抑制因子 1 (TIMP 1 )的影响,探讨 1α, 25(OH)2D3 调节骨代谢作用机制。方法　人成骨细胞用 1α, 25 (OH)2D3 干预。Western杂交检测MT1 MMP蛋白质表达。MMP 1、MMP 2、TIMP 1的分泌及MMP 2的活性用ELISA检测。Northern杂交检测维生素D受体、MT1 MMPmRNA表达。结果　 1α, 25 (OH)2D3 对人成骨细胞MMP 1、MMP 2、TIMP 1表达无影响, 10-10 ~ 10-8 mol/L 1α, 25 (OH)2D3 干预诱导成骨细胞MT1 MMP表达呈剂量依赖性 (P值均 <0 05);促进MMP 2激活呈剂量依赖性 [MMP 2活性分别为(42 3 ± 8 6)、(64 4 ±11 4)、(93 5 ±9 9)μg/L, P值均<0 05]。结论　由于MT1 MMP在骨吸收过程中起着关键作用, 1α, 25(OH)2D3 可通过诱导成骨细胞MT1 MMP表达刺激骨吸收。     

基质金属蛋白酶和心肌梗死后心室重构

心肌梗死后心室重构是慢性心力衰竭发展的重要病理基础，延缓或阻止心室重构已成为慢性心力衰竭的主要治疗方法。基质金属蛋白酶是一组与心室胞外基质重构有关的水解酶，抑制基质金属蛋白酶的表达和活性对心室重构的防治有重要意义。     

大鼠缺血再灌注心肌基质金属蛋白酶不同时程的表达

目的:探讨大鼠心肌缺血再灌注不同时间点基质金属蛋白酶(MMP)-1,2,9的表达及其意义。方法:建立大鼠在体心肌缺血再灌注损伤模型,采用免疫组化法检测心肌组织中MMP-1,2,9的表达,以四通道电生理仪检测心功能,比色法测定血浆肌酸激酶(CK)、乳酸脱氢酶(LDH)和髓过氧化物酶(MPO)活性。结果:与假手术组相比缺血再灌注组心功能明显降低,CK、LDH和MPO活性显著增高,呈明显的时间依赖性,于再灌注2 h达到峰值(P<0.01)。缺血再灌注后大鼠心肌中MMP-1的表达水平明显高于假手术组和缺血组(P<0.05),以再灌注1 h最为明显(P<0.01),且与心功能的改变呈负相关(r=-0.503~-0.748,P均<0.01);MMP-2没有表达;MMP-9的表达于再灌注1 h开始增强,再灌注2 h达到高峰(P<0.01),与心功能呈负相关(r=-0.732~-0.855,P均<0.01)。结论:MMPs可能参与心肌缺血再灌注损伤过程。     

Time-dependent changes in myocardial structure following discrete injury in mice deficient of matrix metalloproteinase-3

Myocardial scars from radiofrequency (RF) ablation can increase in size in the post-injury period, resulting in remodeling of the extracellular matrix (ECM). The matrix metalloproteinases (MMPs) contribute to adverse myocardial remodeling following injury. However, the role of specific MMP types in RF scar enlargement remains unclear. One MMP type, MMP-3, degrades a wide range of ECM substrates and can activate other MMPs. This project examined LV remodeling in wild type (WT) and MMP-3 deficient (mmp-3-/-) mice following RF injury. RF lesions (0.5 mm probe, 80 degrees C, 30 s) were created on the LV epicardium of WT (C57/BL6) and mmp-3-/- mice and were terminally studied at 1 h, 3, 7, and 28 days post-RF (n=10 each). Heart mass indexed to tibial length (mg/mm) was similar in the WT and mmp-3-/- mice at 1 h (8.1+/-0.3 vs. 7.6+/-0.3), but lower in the mmp-3-/- mice at 28 days post-RF (11.9+/-0.4 vs. 10.5+/-0.4, P<0.05). Scar volumes were greater in the mmp-3-/- mice at 3 days, but similar in the two groups at 28 days. Immunohistochemical localization showed fewer macrophages and lymphocytes at the scar border at 3 days in the mmp-3-/- hearts, but similar staining for these cells in WT and mmp-3-/- hearts at 7 and 28 days post-RF. Post-RF, the early increase in scar volume was accelerated in mmp-3-/- mice and associated with abnormal inflammatory cell infiltration/migration to the area of injury. These findings define a mechanistic role for MMP-3 in RF scar expansion and provide a temporal window during which interruption of MMP-3 activation may impair post-RF myocardial wound healing.     

葛根素对兔动脉粥样硬化基质金属蛋白酶-9及其组织抑制物-1表达的影响

目的：观察葛根素对动脉粥样硬化兔髂动脉分泌和表达基质金属蛋白酶-9（MMP-9）及其组织抑制物-1（TIMP-1）的影响。方法：20只家兔分为正常对照组（正常饮食，6只）、病理对照组（球囊和高脂饮食，8只）和葛根素组（球囊、高脂饮食和葛根素，8只）。球囊损伤后4周处死，取一侧病变髂动脉做病理切片，应用免疫组化法测定MMP-9和TIMP-1的蛋白表达；取另一侧病变髂动脉抽提总RNA应用半定量逆转录多聚酶链式反应（RT—PCR）测定MMP-9和TIMP-1 mRNA的表达。结果：兔动脉粥样斑块MMP-9 mRNA（mRNA／GAP—DH mRNA）表达：正常对照组、病理对照组、葛根素组的分别为0．81±0．17，1．52±0．24，1.03±0．19，病理对照组、葛根素组的较正常对照组显著增加（P〈0．05），而葛根素组的较病理对照组显著下降（P〈0．05），上述三组的TIMP—1 mRNA的表达依次为1．44±0．14，2．63±0．16，2．67±0．12，病理对照组与葛根素组的较正常对照组显著增加（P〈0．05），但病理对照组与葛根素组间无显著差异（P〉0．05）。免疫组化检测显示葛根素抑制MMP-9蛋白质表达（P〈0．05），但对TIMP-1蛋白质的表达无影响。结论：葛根素可能是通过调节兔动脉粥样斑块分泌MMP-9途径发挥稳定动脉粥样硬化斑块的作用。     

五种基质金属蛋白酶基因在乳头状甲状腺癌中的表达

目的　探讨基质金属蛋白酶 (matrixmetalloproteinase ,MMP)基因表达与乳头状甲状腺癌的关系。方法　取甲状腺手术标本 ,包括乳头状甲状腺癌 8例、桥本甲状腺炎 7例、甲状腺腺瘤 8例和正常甲状腺组织 8例 ,提取其总RNA。分别进行RT PCR扩增MMP 2、MMP 9、MMP 14、MMP 2 5与MMP 2 6基因 ,其产物经 1%琼脂糖凝胶电泳后进行荧光强度扫描 ,并进行统计学分析 ,比较各种基因在不同组中的表达水平。结果　在乳头状甲状腺癌组织中 ,MMP 2、MMP 9、MMP 14的表达阳性率及表达水平明显高于桥本甲状腺炎、甲状腺腺瘤和正常对照组 (均P <0 .0 5 ) ,其它 3组间差异则无显著性。MMP 2 5、MMP 2 6在 4组甲状腺组织表达阳性率及表达水平都极低 ,4组间差异无显著性。结论　MMP 2、MMP 9、MMP 14在乳头状甲状腺癌中的表达增强很可能与乳头状甲状腺癌的发生有关。     

一氧化氮对哮喘大鼠基质金属蛋白酶的表达调控

目的　观察一氧化氮 (NO)对哮喘大鼠基质金属蛋白酶 (MMP)及金属蛋白酶组织抑制物表达的影响 ,探讨其在哮喘气道结构重建中的作用。方法　 30只雄性Wistar大鼠随机分为对照组、哮喘组和左旋精氨酸组 (L Arg组 ) ,每组 1 0只。肺组织作病理切片并HE染色 ,通过病理图像分析系统测定支气管基底膜周径 (Pbm)、总管壁面积 (WAt)、内壁面积 (WAi) ,平滑肌面积 (WAm)等形态学参数。用NO与一氧化氮合酶 (NOS)试剂盒测定肺组织中亚硝酸盐 /硝酸盐 (NO- 2 /NO- 3)水平与NOS活性。半定量逆转录聚合酶链反应技术 (RT PCR)分析肺组织中MMP 2与TIMP 1mRNA的表达。结果(1 )WAt/Pbm、WAi/Pbm及WAm/Pbm哮喘组 [分别为 (2 5 3± 2 1 ) μm2 / μm、(2 0 4± 2 3) μm2 / μm、(4 2±2 0 ) μm2 / μm]和L Arg组 [分别为 (35 1± 2 6) μm2 / μm、(2 5 3± 2 0 ) μm2 / μm、(8 7± 1 5) μm2 / μm]与对照组 [分别为 (2 0 8± 1 3) μm2 / μm、(1 5 3± 2 1 ) μm2 / μm、(3 1± 1 1 ) μm2 / μm]比较 ,差异有显著性(P <0 0 1 ) ;L Arg组与哮喘组比较差异亦有显著性 (P <0 0 5)。 (2 )肺组织中NO- 2 /NO- 3水平哮喘组[(7 2± 2 1 )nmol/mg]和L Arg组 [(1 1 8± 1 7)nmol/mg]与对照组 [(3 1± 1 2 )n     

血管紧张素Ⅱ受体拮抗剂对梗死心脏纤连蛋白的调节

目的探讨血管紧张素Ⅱ(AngⅡ)受体(AT1,AT2)拮抗剂对梗死心脏心肌基质金属蛋白酶(MMP)及细胞外基质纤连蛋白(fibronectin,FN)的影响。方法结扎大鼠左冠状动脉建立心肌梗死模型,术前7天起分别用安慰剂、AT1受体拮抗剂缬沙坦(10mg.kg-1.d-1)、AT2受体拮抗剂PD123319(30mg.kg-1.d-1)。术后1、3、7天免疫沉淀法分别检测左心室游离壁(LVFW)、室间隔、右室壁心肌组织基质金属蛋白酶MMP-2、3、9及基质金属蛋白酶抑制物-1(TIMP-1)及细胞外基质FN的表达,免疫荧光检测LVFW、室间隔、右心室心肌FN的分布。结果术后7天右心室心肌排列基本正常,室间隔心肌肥厚,LVFW心肌有不同程度的坏死、肥厚及纤维化。术后1、3、7天室间隔MMP-2、3、9蛋白表达呈逐渐增加的趋势,TIMP-1及FN表达逐渐减少,各时相点与基础值相比差异有统计学意义(P<0.01);术后1、3、7天LVFWMMP-2、3、9蛋白表达一直处于高水平,TIMP-1和FN蛋白表达处于低水平,各时相点与基础值比较差异有统计学意义(P<0.01)。FN在右心室心肌组织中表达较多,其次为室间隔和LVFW,MMP-2、3、9表达与FN表达结果相反。室间隔和LVFWMMP表达,手术+缬沙坦组低于手术组和手术+PD123319组(均P<0.01),手术组与手术+PD123319组比较差异无统计学意义。手术+缬沙坦组室间隔及LVFWFN表达高于手术组和手术+PD123319组(P<0.01),手术组与手术+PD123319组比较差异无统计学意义。手术组心肌梗死面积(51.0%±2.8%)高于手术+缬沙坦组(40.4%±2.1%,P<0.05),手术组与手术+PD123319组(49.5%±2.1%)比较,差异无统计学意义。结论血管紧张素Ⅱ受体AT1拮抗剂通过增加MMP-2、3、9的表达而降解心肌细胞外基质FN参与心肌重构的病理过程,进一步恶化心功能。     

基质金属蛋白酶3与动脉粥样硬化关系研究的进展

本文概述了基质金属蛋白酶3与动脉粥样硬化之间的关系,并重点介绍了基质金属蛋白酶家族及其来源,基质金属蛋白酶分类、结构、调节、共同特征,以及基质金属蛋白酶-3在动脉粥样硬化中的表达及作用.     

基质金属蛋白酶在大鼠心肌梗死模型心室重塑中的作用

目的:研究心肌梗死(MI)后基质金属蛋白酶2,9(MMP2,9)和组织金属蛋白酶抑制酶1(TIMP1)的变化规律,以及在左心室重塑过程中的作用。方法:通过结扎SD大鼠冠状动脉前降支建立MI模型。另设空白对照组、手术对照组。取MI术后第1天,术后1、2、4周各组心肌组织,采用免疫组化法测定其胶原含量和Ⅰ/Ⅲ胶原比例,酶谱法测定MI后MMP2,9活性蛋白的表达规律,WesternBlotting进一步确定酶谱法中所消化条带蛋白的属性,逆转录聚合酶链反应法(RTPCR)测定MI后MMP2、9和TIMP1mRNA的变化规律。结果:SD大鼠心肌内胶原含量在MI后第2、4周增加(P<0.01),Ⅰ/Ⅲ胶原比例同时期下降(P<0.05),MMP2、9蛋白水平和mRNA水平在MI后活性增强、表达增加,TIMP1蛋白含量减少。结论:SD大鼠MI后心肌组织内MMP2、9mRNA转录增加,TIMP1mRNA转录减少,MMP2、9活性增高和蛋白含量增加,TIMP1蛋白表达减少,胶原含量增加,Ⅰ/Ⅲ胶原比例下降,是参与心室重塑机制的重要组成部分。     

老年心房颤动患者胶原代谢与基质金属蛋白酶表达的研究

目的 通过酶联免疫吸附方法,对心房颤动(房颤)患者血清胶原代谢标志物I型前胶原羧基端肽(carboxy terminal propeptide of type I procollagen,PICP)、I型前胶原氨基端肽(nitrogen terminal propeptide of type I procollagen,PINP)、Ⅲ型前胶原氨基端肽(nitrogen terminal propeptide of typeⅢprocollagen,P Ⅲ NP)、I型胶原羧端交联肽(type I collagen carboxy terminal telopeptide,ICTP)和基质金属蛋白酶(Matrix metalloproteinases,MMPs)及其内源性抑制剂金属蛋白酶组织抑制因子(tissue inhibitors of metalloproteinases,TIMPs)表达进行定量研究,以探讨房颤时心房的结构重构.方法 选取71例老年患者,其中永久性房颤组24例,阵发性房颤组24例,窦性心律组23例.应用ELISA法检测患者血清中PICP、PINP、PⅢNP、ICTP及MMP-1、MMP-2、MMP-7、MMP-9、TIMP-1和TIMP-2的含量.结果 永久性房颤组PICP较阵发性房颤组及窦性心律组分别升高25.4%和42.8%(P<0.05).永久性房颤组PⅢNP较阵发性房颤组及窦性心律组分别升高17.9%和35.6%(P<0.05),阵发性房颤组较窦性心律组升高15.0%(P<0.05).3组间PINP和ICTP比较,差异无统计学意义(均为P>0.05).阵发性房颤组MMP-1较窦性心律组升高25.6%(P<0.05).永久性房颤组MMP-2较阵发性房颤组及窦性心律组分别升高54.9%和37.9%(P<0.05).3组间MMP-7、MMP-9及TIMP-1比较,差异无统计学意义(均为P>0.05).永久性房颤组及阵发性房颤组TIMP-2较窦性心律组下降21.8%和11.8%(P<0.05).结论 房颤时,MMPsTIMPs系统间相互作用失衡,使胶原合成与降解失衡,这可能是房颤时心房结构重构的机制之一,与房颤的发生和维持有关.     

A matrix metalloproteinase inhibitor promotes granuloma formation during the early phase of Mycobacterium tuberculosis pulmonary infection

OBJECTIVE: The host response to pulmonary Mycobacterium tuberculosis (Mtb) infection results in granuloma formation in an effort to limit infection, but the host immune cells also provide an environment in which Mtb persists. Granuloma formation requires immune cell infiltration and concurrent extensive remodeling of pulmonary tissue which we hypothesize to be the result of increased matrix metalloproteinases (MMP) activity. DESIGN: C57BL/6 mice infected with virulent Mtb (H37Rv) via intratracheal inoculation were treated with a synthetic inhibitor of MMP activity (BB-94). Mice were assessed for colony forming units, granuloma morphology, leukocyte recruitment and cytokine levels over 90 days of infection. RESULTS: BB-94 treated mice had significantly decreased numbers of pulmonary and blood-borne Mtb early during disease, increased collagen deposition within early granulomas and significantly decreased pulmonary leukocyte recruitment when compared to vehicle-treated, Mtb-infected mice. Cytokine expression did not differ significantly between groups. CONCLUSION: Events of early granuloma formation can be modified by inhibiting MMP activity, by decreasing leukocyte recruitment, a major source of MMPs during infection, enhancing the establishment of granulomas and decreasing blood-borne dissemination of Mtb.     

Proteasome inhibition induces a senescence-like phenotype in primary human fibroblasts cultures

Senescent human fibroblasts exhibit several genetic and biochemical differences as compared to their young counterparts including abnormalities of the main proteolytic mechanism, namely the proteasome. Specifically, we and others have shown that there is an impaired function of the proteasome, as senescent cells have reduced proteolytic activities and less proteasome content. In a complementary work we have recently shown that inhibition of the proteasome by a specific inhibitor induces a senescence-like phenotype in young WI38 fibroblasts [Chondrogianni et al. (2003) J Biol Chem 278: 28026-28037]. In this study we tested whether the induction of a senescence-like phenotype following treatment with proteasome inhibitors is a common feature of primary human fibroblasts. A comparative biochemical analysis, after employing three different human fibroblasts cell lines (IMR90, MRC5 and WI38 cells), as well as two proteasome inhibitors (epoxomicin and MG132), has shown that proteasome inhibition results in the appearance of a senescence-like phenotype in all cell lines used. Proteasome inhibitors treated cells were irreversibly stopped dividing, exhibited positive staining to beta-galactosidase as well as reduced CT-L and PGPH activities. In summary, these data reveal the fundamental role of the proteasome in the progression of replicative senescence and open new dimensions towards a better understanding of protein degradation.     

心肌梗死患者右心房基质金属蛋白酶表达水平的变化

目的 研究冠心病心肌梗死(MI)患者右心房组织基质金属蛋白酶(MMP)及其抑制剂(TIMP)的基因表达,探讨其与右心房结构重构的关系.方法 选取因冠心病接受冠状动脉旁路移植术(CABG)的患者40例,其中MI 22例,不稳定性心绞痛(UA)组18例,术前进行超声心动图检查.于开胸手术时取右心耳标本,分别进行免疫组织化学染色检查、荧光定量PCR方法检测标本中MMP-1、MMP-3、MMP-7、MMP-9及TIMP-1表达.结果 MI组左右心房内径及左心室内径均大于UA组[左心房内径:(40.8±4.2)mm比(33.1±5.1)mm,P<0.01;右心房内径:(44.1±6.8)mm比(28.8±6.0)mm,P<0.01;左心室内径:(48.9±6.0)mm比(39.7±7.1)mm,P<0.01],心房组织中MMP-3、MMP-9及TIMP-1基因表达高于UA组(MMP-3:0.39±0.18比0.28±0.07,P<0.05:MMP-9:0.81±0.21比0.55±0.20,P<0.01;TIMP-1:1.79±0.89比0.94±0.47,P<0.01),MMP-1、MMP-7基因表达有增加趋势,但差异无统计学意义.结论 冠心病心肌梗死患者右心房组织MMP及TIMP表达水平的升高与右心房重构相关.     

PPARγ激动剂对自发性高血压大鼠基质金属蛋白酶2的影响

目的：观察过氧化物酶体增殖物激活受体γ（PPARγ）激动剂罗格列酮对自发性高血压大鼠（SHR）心、肾、动脉血管基质金属蛋白酶2（MMP-2）表达及活性的影响，探讨罗格列酮心血管保护作用的机制。方法：健康雄性12周龄SHR大鼠12只，体重245～255g，随机被分为2组：对照组及罗格列酮组（5mg／kg·d），每组6只。应用实时多聚酶链氏反应（PCR）、Western印迹法、明胶酶谱法（zymography）等方法对用药4周后的SHR心、肾、动脉MMP-2的表达进行测定。结果：罗格列酮治疗能使SHR心、肾MMP-2 mRNA的表达降低97．6％和58．9％（P〈0．01，P〈0．05），使胸主动脉、颈动脉MMP-2的活性降低30．7％和24．6％（P〈0．05），而蛋白表达无明显差异。结论：罗格列酮治疗逆转SHR靶器官损害的作用机制可能与降低MMP-2的作用有关。     

Role of matrix metalloproteinase, tissue inhibitor of metalloproteinase and tumor necrosis factor-α single nucleotide gene polymorphisms in inflammatory bowel disease

AIM:To study the (functional) relevance of single nucleotide polymorphisms (SNPs) in genes encoding matrix metalloproteinases (MMP)-1,-2,-3,-9,tissue inhibitors of metalloproteinases (TIMP)-1,-2 and tumor necrosis factor (TNF)-α in the etiopathogenesis of inflammatory bowel diseases (IBD),that may enhance susceptibility and/or disease severity. METHODS:Genomic DNA from 134 Crohn's disease (CD),111 ulcerative colitis (UC) patients and 248 control subjects was isolated from resected intestinal tissue or blood. Allelic composition at SNP loci was determined by PCR-RFLP or tetra primer ARMS PCR. RESULTS:The TIMP-1 genotype TT in women and T in men at SNP +372 T/C was found to increase CD susceptibility (39% vs 23.8%,P=0.018 and 67.9% vs 51.6%,P=0.055,respectively),while women with this genotype were less prone to development of fistulae during follow-up (41.4% vs 68.3%,P=0.025). Male IBD or CD patients carrying the TIMP-1 +372 T-allele expressed lower levels of TIMP-1 in surgically resected macroscopically inflamed tissue (0.065 < P < 0.01). The 5T5T genotype at MMP-3 SNP -1613 5T/6T increased the chance of stenotic complications in CD during follow-up (91.2% vs 71.8%,P = 0.022) but seemed to protect against colonic involvement of this disease at first endoscopic/radiologic examination (35.3% vs 59.5%,P=0.017). CONCLUSION:Allelic composition at the examinedSNPs in genes coding for TIMP-1 and MMP-3 affect CD susceptibility and/or phenotype,i.e.,fistulizing disease,stricture pathogenesis and first disease localisation. These findings reinforce the important role of these proteins in IBD.     

Role of matrix metalloproteinase, tissue inhibitor of metalloproteinase and tumor necrosis factor-α single nucleotide gene polymorphisms in inflammatory bowel disease

AIM: To study the (functional) relevance of single nucleotide polymorphisms (SNPs) in genes encoding matrix metalloproteinases (MMP)-1, -2, -3, -9, tissue inhibitors of metalloproteinases (TIMP)-1, -2 and tumor necrosis factor (TNF)-α in the etiopathogenesis of inflammatory bowel diseases (IBD), that may enhance susceptibility and/or disease severity.METHODS: Genomic DNA from 134 Crohn's disease (CD), 111 ulcerative colitis (UC) patients and 248 control subjects was isolated from resected intestinal tissue or blood. Allelic composition at SNP loci was determined by PCR-RFLP or tetra primer ARMS PCR.RESULTS: The TIMP-1 genotype ∏ in women and T in men at SNP +372 T/C was found to increase CD susceptibility (39% vs 23.8%, P = 0.018 and 67.9% vs 51.6%, P = 0.055, respectively), while women with this genotype were less prone to development of fistulae during follow-up (41.4% vs 68.3%, P = 0.025). Male IBD or CD patients carrying the TIMP-1 +372 T-allele expressed lower levels of TIMP-1 in surgically resected macroscopically inflamed tissue (0.065 ＜ P ＜ 0.01). The 5TST genotype at MMP-3 SNP -1613 5T/6T increased the chance of stenotic complications in CD during followup (91.2% vs 71.8%, P = 0.022) but seemed to protect against colonic involvement of this disease at first endoscopic/radiologic examination (35.3% vs 59.5%, P = 0.017).CONCLUSION: Allelic composition at the examined SNPs in genes coding for TIMP-1 and MMP-3 affect CD susceptibility and/or phenotype, i.e., fistulizing disease,stricture pathogenesis and first disease localisation.These findings reinforce the important role of these proteins in IBD.     

心肌组织基质金属蛋白酶-1,2,9及其抑制物-1,2基因表达变化在心肌肥厚患者心肌纤维化中的意义

目的:探讨人心室肥厚时心肌组织基质金属蛋白酶(MMP)-1,2,9及其抑制物(TIMP)-1,2基因表达的改变及与心肌纤维化的关系。方法:应用病理检查、逆转录—聚合酶链式反应、放射免疫和蛋白印迹杂交等方法,检测心肌肥厚患者(心肌肥厚组)和正常人(对照组)心肌间质胶原容积分数和心肌血管周围胶原面积、心肌组织Ⅰ型和Ⅲ型胶原信使核糖核酸(mRNA)表达、心脏局部血管紧张素Ⅱ(AngⅡ)水平和心肌MMP-1,2,9及TIMP-1,2蛋白表达。结果:心肌间质胶原容积分数和心肌血管周围胶原面积比心肌肥厚组比对照组均明显增高(P均<0．01)。心肌肥厚组心肌组织Ⅰ型胶原及Ⅲ型胶原mRNA表达相对含量也均明显高于对照组(P均<0．01)。心肌肥厚组心肌组织匀浆液血管紧张素Ⅱ水平为(179．3±36．1)pg／mg心肌组织,对照组为(103．2±13．6)pg/mg心肌组织,与对照组比较,心肌肥厚组心肌组织血管紧张素Ⅱ水平明显增高(P<0．01)。心肌肥厚组心肌组织MMP-1,2,9蛋白表达比对照组明显增多(P均<0．01),TIMP-1,2蛋白表达也比对照组明显增加(P均<0．05)。结论:心肌肥厚时心肌胶原的代谢受到MMPs／TIMPs的调节。MMP-1,2,9和TIMP-1,2蛋白表达均增加,使MMPs的活性受到抑制,胶原合成增加的速度大于胶原降解的速度,导致心肌纤维化。     

介入时机与西洛他唑对非ST段抬高型心肌梗死后左心室重构的影响

目的 探讨非ST段抬高型心肌梗死(NSTEMI)后血浆基质金属蛋白酶(MMP)的变化及经皮冠状动脉介入治疗(PCI)时机、西洛他唑对NSTE MI后左心室重构的影响.方法 连续入选行PCI的NSTEMI患者189例,将其中成功随访的164例患者纳入研究.患者分为早期PCI联合西洛他唑组(A组)、早期PCI组(B组)、延迟PCI联合西洛他唑组(C组)和延迟PCI组(D组).检测各组患者心肌梗死后不同时间血浆MMP-2及MMP-9水平.患者于入院时及PCI术后1年行超声心动图检查.结果 (1)NSTEMI后2 d、4 d、2周和4周,MMP-2水平均为A组低于B组,C组低于D组(均P＜0.05).NSTEMI后4 d、2周和4周,MMP-9水平均为A组低于B组,C组低于D组(均P＜0.05).(2)随访1年显示,左心室舒张末期容积和左心室射血分数的变化值均为A组低于B组,C组低于D组,B组低于D组(P＜0.05或P＜0.01).左心室缩短分数、左心室舒张末期内径、左心室后壁厚度、室间隔厚度变化值各组间差异均无统计学意义.结论 早期介入治疗及西洛他唑可以改善左心室重构,西洛他唑对左心室重构的影响可能与抑制MMP有关.