缺氧对肝星状细胞基质金属蛋白酶Ⅱ表达及活性调节的影响

目的 研究缺氧对ＨＳＣ基质金属蛋白酶Ⅱ（ｍａｔｒｉｘ ｍｅｔａｌｌｏｐｒｏｔｅｉｎａｓｅ－２,ＭＭＰ－２）表达及活性调节的影响。方法 大鼠ＨＳＣ体外原代培养,以免疫细胞化学及ＥＬＩＳＡ法分别检测细胞内ＭＭＰ－２及基质金属蛋白酶组织抑制因子Ⅱ（Ｔｉｓｓｕｅ ｉｎｈｉｂｉｔｏｒ ｏｆ ｍｅｔａｌｌｏｐｏｒｅｉｎａｓｅ－２,ＴＩＭＰ－２）的表达,和培养上清流中两者的相对量,并以酶图法测培养上清液ＭＭＰ－     

TIMP-2、MMP-2和MT1-MMP在活化肝星状细胞中的表达及对细胞外基质合成分泌的影响

目的 研究金属蛋白酶组织抑制剂-2(TIMP-2)、基质金属蛋白酶-2(MMP-2)和膜型基质金属蛋白酶-1(MT1-MMP)在活化肝星状细胞(HSCs)中的表达,观察其对细胞外基质(ECM)合成分泌的影响.方法 原代分离培养大鼠HSCs活化后,分别给予40～160 pmol化学合成经修饰抗TIMP-2 siRNA进行干预,检测培养细胞上清液透明质酸(HA)、Ⅲ型前胶原(PCⅢ)和羟脯氨酸(Hyp)的含量,采用荧光实时定量PCR法检测TIMP-2、MMP-2、MT1-MMP、MMP-13、COL Ⅰ和COL Ⅲ mRNA的表达,western印迹检测TIMP-2、MT1-MMP和MMP-13蛋白表达及明胶酶谱法检测MMP-2蛋白表达.结果 应用化学合成经修饰抗TIMP-2 siRNA后,TIMP-2、MMP-2、MT1-MMP、COL Ⅰ和COL Ⅲ的表达明显降低,而MMP-13的表达则明显增加,培养细胞上清液中HA、PCⅢ和Hyp的含量也明显减少.结论 TIMP-2通过MT1-MMP介导MMP-2的活化,抑制TIMP-2的表达,MT1-MMP和MMP-2的表达随之降低,而HSCs合成分泌ECM也相应减少.     

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。     

骨桥蛋白在高氧所致急性肺损伤中的作用及机制的初步探讨

目的探讨骨桥蛋白(OPN)在高氧所致小鼠急性肺损伤(ALI)发病过程中的作用及其机制。方法将72只OPN基因野生型(OPN+/+)小鼠随机分为正常对照组(WN组)、高氧24h组(WO1组)、高氧48h组(WO2组)、高氧72h组(WO3组),每组18只;将72只OPN基因缺失型(OPN-/-)小鼠随机分为正常对照组(DN组)、高氧24h组(DO1组)、高氧48h组(DO2组)、高氧72h组(DO3组),每组18只。正常对照小鼠呼吸室内空气,高氧小鼠置于密闭的氧气室(氧浓度>95%)。行支气管肺泡灌洗液(BALF)细胞计数及分类,评价小鼠肺损伤程度;将OPN-/-、OPN+/+小鼠各20只暴露于高氧下纪录生存时间;明胶酶谱分析基质金属蛋白酶2(MMP2)、MMP9的释放及活性;逆转录聚合酶链反应(RT PCR)检测OPN、MMP2、MMP9、金属蛋白酶1组织抑制剂(TIMP1)和TIMP2mRNA的表达。结果DO3组小鼠肺损伤较WO3组更严重。OPN-/-小鼠生存期显著缩短(χ2=23.91、P<0.01)。DO3组小鼠BALF细胞总数[(72.2±22.3)×104/L]显著高于WO3组[(39.7±10.4)×104/L,P<0.05],其中中性粒细胞数增加近8倍[(207.54±36.45)×103/L,(25.33±6.43)×103/L,P<0.01]。明胶酶谱分析显示,DO3组小鼠BALF活化的MMP9表达[(4.36±0.65)×104]显著高于WO3组[(2.84±0.44)×104,P<0.01]。RT PCR显示,WO2、WO3组小鼠肺组织OPNmRNA表达(0.87±0.08、0.92±0.07)显著高于WN组(0.69±0.04,P均<0.05);WO3组小鼠TIMP1表达(1.09±0.12)显著高于DO3组(0.62±0.09,P<0.05);WO2、WO3组小鼠肺组织TIMP2mRNA表达(1.05±0.23、0.99±0.13)分别与DO2、DO3组比较差异均有统计学意义(0.59±0.11、0.75±0.16,P<0.01、<0.05)。结论OPN通过促进TIMP的表达而抑制MMP的释放和激活,从而减轻高氧所致的ALI。     

慢性阻塞性肺疾病患者肺组织中基质金属蛋白酶抑制剂-1及基质金属蛋白酶-9与细胞黏附因子表达的关系

目的 研究COPD患者肺组织中基质金属蛋白酶抑制剂-1(TIMP-1)、基质金属蛋白酶-9(MMP-9)、细胞黏附因子-1(ICAM-1)蛋白和mRNA的分布和表达,探讨其与气流阻塞的关系及吸烟对其影响.方法 取39例因肺癌行肺叶切除的癌旁肺组织标本,其中不吸烟不伴COPD组(A组)9例、吸烟不伴COPD组(B组)11例、吸烟伴COPD组(C组)19例.用免疫组化和逆转录聚合酶链反应方法检测TIMP-1、MMP-9、ICAM-1的蛋白和mRNA表达,并进行相关性分析.结果 MMP-9表达于肺泡上皮细胞、支气管上皮细胞、血管平滑肌细胞、肺泡巨噬细胞、间质细胞,C组MMP-9免疫组化阳性细胞数(54.0±15.0)明显高于A组和B组(1.2±0.7和1.4±0.8);TIMP-1蛋白表达的主要部位为肺泡巨噬细胞、肺泡上皮细胞、毛细血管内皮细胞、血管平滑肌细胞,C组弱表达,A组和B组无表达;ICAM-1主要表达于肺泡上皮细胞,C组ICAM-1免疫组化阳性细胞数(52.1±13.4)明显高于A组和B组(2.1±1.1和4.5±2.4).C组MMP-9、TIMP-1、ICAM-1的mRNA平均吸光度值(0.71±0.16、0.47±0.10、0.62±0.15)明显高于A组(0.17±0.05、0.20±0.06、0.37±0.11)和B组(0.20±0.08、0.26±0.08、0.44±0.12).C组肺组织TIMP-1、MMP-9与ICAM-1的mRNA表达水平呈直线正相关,MMP-9与ICAM-1蛋白表达水平呈显著正相关.MMP-9和ICAM-1的mRNA及蛋白表达水平、TIMP-1的mRNA表达水平与FEV1占预计值%、FEV1/FVC占预计值%均呈显著负相关.结论 TIMP-1、MMP-9和ICAM-1在促进炎性细胞迁移进入细胞外基底膜及气道上皮细胞,导致肺组织破坏和重塑,引起及加重COPD患者的气流阻塞中起着重要作用.     

特发性肺纤维化患者支气管肺泡灌洗液和血清基质金属蛋白酶及其抑制剂检测

目的探讨特发性肺纤维化(IPF)患者支气管肺泡灌洗液(BALF)及血清中基质金属蛋白酶9(MMP9)、基质金属蛋白酶组织抑制剂1(TIMP1)水平的变化。方法2001至2004年用酶联免疫吸附(ELISA)法检测30例IPF患者BALF及血清中MMP9和TIMP1的水平,同时行肺高分辨率CT(HRCT)及肺功能检查。健康非吸烟的自愿献血者30名,为血清对照组。以胸痛为自觉症状在我院自愿进行纤维支气管镜及BALF检查,经体检及X线检查证实为健康者13名,作为BALF对照组。结果IPF患者BALF及血清中MMP9水平为(245±26)和(203±32)ng/L,对照组为(205±22)和(186±16)ng/L,两组相比差异无统计学意义;IPF组BALF及血清中TIMP1水平[(522±81)、(166±29)ng/L]高于对照组[(201±31)、(87±16)ng/L],差异有统计学意义;IPF组BALF及血清中MMP9/TIMP1比值(0.53±0.18,1.5±0.3)低于对照组(1.06±0.38,2.6±0.5)。HRCT、肺功能评分及BALF中上述指标与MMP9无明显相关性,与TIMP1呈正相关,与MMP9/TIMP1比值呈负相关。结论IPF患者肺纤维化的发生与TIMP1水平升高及MMP9/TIMP1比值降低对细胞外基质降解的抑制有关,后者可能意义更大;患者肺影像学及肺功能变化可能也与此有关。     

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     

Urokinase plasminogen activator stimulates function of active forms of stromelysin and gelatinases (MMP-2 and MMP-9) in cirrhotic tissue

BACKGROUND: The authors' previous data support the notion that adenoviral-driven urokinase plasminogen activator (u-PA) expression results in reversion of experimental liver cirrhosis. The specific aim of the present study was to decipher the mechanisms involved in the regulation by endogenous/gene-delivered u-PA of matrix metalloproteinases (MMP) and related proteins engaged in degradation of excessive hepatic connective tissue. METHODS: Tissue slices from cirrhotic rat livers were incubated with u-PA-rich supernatants from 24-h-cultured hepatic stellate cells (HSC). Matrix metalloproteinase-2, -9 and tissue inhibitor of metalloproteinases-1 (TIMP-1) were detected by western blot and biologic activity. The HSC that discontinued u-PA production were transfected with the adenovector Adu-PA and serum-free supernatants evaluated for proteolytic activity by MMP-3, MMP-2 and MMP-9. Collagen I, transforming growth factor-beta1 (TGF-beta1), plasminogen activator inhibitor-1 (PAI-1) and TIMP-1 mRNA levels were also evaluated. RESULTS AND CONCLUSION: Endogenous u-PA from cultured HSC significantly induced the active forms of MMP-2 (68 kDa) and MMP-9 (78 kDa) in cirrhotic tissue slices. The TIMP-1 molecular forms demonstrated that u-PA pushed the presence of 'free' TIMP-1 (not complexed with MMP; 71%) in cirrhotic tissue. When non-producing u-PA-HSC were transfected with adenoviral vector coding for the functional human protein u-PA (Adhu-PA), an overactivation of MMP-3, MMP-2 and MMP-9 (800%, 48% and 100%, respectively) was found as compared with HSC transfected with control adenovirus encoding green fluorescent protein (Ad-GFP). Finally, gene expression of collagen I, TGF-beta1, PAI-1 and TIMP-1 were downregulated by Adhu-PA action as well.     

Matrix metalloproteinase (MMP) expression by differentiated thyroid carcinoma of children and adolescents

The factor(s) that control metastasis of thyroid carcinoma are unknown, but the matrix metalloproteinases (MMPs) are excellent candidates. MMP-1, membrane-type-1 MMP (MT1-MMP), and tissue inhibitor of MMP-1 (TIMP-1) have all been implicated, but the site of production and importance are disputed. In vitro, normal thyroid cells secrete TIMP-1, while thyroid cancer cells secrete TIMP-1 and MMP-1. However, previous pathological studies identified MMP-1 and TIMP-1 only in the stroma surrounding thyroid carcinoma. These data suggest that thyroid carcinoma or tumor-associated inflammatory cells might secrete a factor(s) which stimulates MMP-1 or TIMP-1 expression by surrounding tissues. We hypothesized that MMP-1, MT1-MMP, and TIMP-1 would be directly expressed by thyroid carcinoma and might promote invasion or metastasis. We used immunohistochemistry to determine the expression of MMP-1, MT1-MMP, and TIMP-1 in 32 papillary thyroid carcinoma (PTC), 10 follicular thyroid carcinoma (FTC) and 13 benign thyroid lesions from children and adolescents. The intensity of staining was graded from absent (grade 0) to intense (grade 3). Average MMP-1 expression (mean relative intensity units+/-SE) was significantly greater among PTC (1.97+/-0.15; p=0.004) and FTC (2.2+/-0.25; p=0.006) compared to benign lesions (1.30+/-0.15); but there was no relationship between MMP-1 expression and invasion, metastasis, or recurrence. Expression of MT1-MMP and TIMP-1 was similar for benign and malignant lesions; but recurrent PTC expressed lower levels of TIMP-1 when compared to non-recurrent PTC (p=0.049). Only the expression of TIMP-1 correlated with the presence of tumor-associated lymphocytes (r=0.35, p=0.032). We conclude that MMP-1, MT1-MMP and TIMP-1 are all expressed by thyroid carcinoma and could be important in promoting recurrence.     

褪黑素对支气管哮喘小鼠胶原沉积及基质金属蛋白酶9和基质金属蛋白酶组织抑制剂1 mRNA与蛋白表达的动态调节

目的应用小鼠慢性支气管哮喘（简称哮喘）模型，观察褪黑素对慢性哮喘小鼠肺组织中胶原沉积的影响及其机制。方法96只SPF级雄性BALB／c小鼠按随机数字表法分为5组。对照组（21只）腹腔注射生理盐水；哮喘组（22只）腹腔注射生理盐水；褪黑素组（23只）腹腔注射褪黑素；地塞米松组（23只）腹腔注射地塞米松；褪黑素拮抗组（7只）腹腔注射褪黑素拮抗剂2-苯基-N-乙酰色胺。根据实验要求每组采用卵白蛋白致敏并反复雾化吸入2、4、8周时再分为2、4、8周亚组。对照组（每组均为7只）；哮喘组（分别为7、7、8只）；褪黑素组（分别为7、8、8只）；地塞米松组（分别为7、8、8只）；而褪黑素拮抗组只做2周组（7只）。实验造成慢性哮喘模型。用Masson三原色法染胶原纤维；用免疫组化方法标记蛋白；用MetaMorph软件测量单位长度基底膜周径上的胶原面积（Wcol／Pbm）和单位面积上基质金属蛋白酶9（MMP-9）及基质金属蛋白酶组织抑制剂1（TIMP-1）免疫组化阳性面积（PA／UA）；用半定量逆转录-聚合酶链反应（RT-PCR）法测定肺组织相应蛋白mRNA水平。结果褪黑素组2、4、8周WcoL／Pbm分别为（11．8±1．3）、（12．3±1．1）、（12．7±1．4）μm^2／μm，哮喘2、4、8周组分别为（14．5±1．5）、（15．8±1．8）、（16．2±1．4）μm^2／μm，两组比较差异有统计学意义（td值分别为3．89、5．96、5．50，P均〈0．01）；褪黑素组2、4、8周MMP-9的PA／UA像素分别为（9．7±4．9）、（14．8±4．9）、（11．0±6．8）万，哮喘2、4、8周组分别为（15．7±6．1）、（26．2±6．9）、（24．6±6．0）万，两组比较差异有统计学意义（td值分别为3．00、4．83、5．50，P均〈0．01）；褪黑素组2、4、8周MMP-9mRNA水平表达分别为0．80±0．40、0．68±0．15、0．67±0．24，哮喘2、4、8周组分别为1．48±0.29、1．40±0.50、1.20±0．40，两组比较差异有统计学意义（td值分别为3．92、4．50、3．29，P均〈0．01）；地塞米松组2、4、8周Wcol／Pbm（11．6±1．3、12．3±1．0、13．0±1．7）μm^2／μm、MMP-9蛋白[（12．5±5．6）、（14．0±4．7、13．6±4．8）万]和mRNA水平（0．69±0．11、0．61±0．16、1．10±0．40）均较哮喘2、4、8周组降低。褪黑素拮抗2周组与哮喘2周组以上各指标比较差异均无统计学意义（td值=0．96，P〉0．05）。结论早期使用褪黑素可抑制胶原沉积，其作用与地塞米松相当。褪黑素可能通过MMP-9介导的途径抑制哮喘气道重塑。     

组织金属蛋白酶抑制物转基因对小鼠肝脏组织结构与抗氧化能力的影响

目的探讨金属蛋白酶抑制物-1（TIMP-1）及其金属蛋白酶（MMP）-2、MMP-9在TIMP1转基因小鼠和正常小鼠肝脏自然衰老过程中的表达和作用。方法选择3、12和24月龄正常和TIMP_1转基因小鼠，采用HE和Masson染色，观察小鼠肝脏的组织病理学改变，用RTPCR和Westernblot法分别检测TIMP-1和MMP-2、MMP-9在不同月龄小鼠肝脏组织中的表达。测定3月龄小鼠肝脏中超氧化物歧化酶（SOD）、单胺氧化酶（MAO）活性及丙二醛含量。结果24月龄小鼠肝脏中有较多的脂肪变性和胶原沉积，TIMP1的表达随小鼠月龄增加而增高，转基因小鼠的病变更明显。两组小鼠MMP-2和MMP-9的表达均无明显变化。3月龄转基因小鼠肝脏组织学结构和形态无明显改变，但SOD活性降低，MAO活性增高，丙二醛含量增高（P〈0．05）。结论TIMP-1表达增高在肝脏衰老过程中可能起重要作用。     

Native matrix metalloproteinase characteristics may influence early stenosis of venous versus arterial coronary artery bypass grafting conduits

PURPOSE: Stenosis and occlusion rates of internal mammary artery (IMA) and saphenous vein (SV) coronary artery bypass grafts (CABGs) are markedly different, which result from respective disparities in vascular remodeling. Matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs) regulate vascular structure and may have important influence on graft patency. However, the MMP milieu and expression profile of the IMA and SV have not been contrasted. Therefore, the aim of this study was to assess and compare the native MMP systems in IMA vs SV conduits. METHODS: IMA (n = 10) and SV (n = 10) specimens were obtained from patients undergoing CABG surgery. Protein levels of MMP-1, MMP-2, and MMP-9, TIMP-1, a membrane-bound MMP activator (MT1-MMP), and an extracellular MMP inducer protein (EMMPRIN) were determined by immunoblotting and quantified by densitometric analysis. MMP-2 and MMP-9 activity was determined by gelatin zymography. RESULTS: MMP-2 levels were significantly higher in SV (2,218 +/- 351 pixels) vs IMA (1,012 +/- 213 pixels) specimens (mean +/- SEM]). There were no significant differences in MMP-1, MMP-9, or TIMP-1 content; however, MT1-MMP and EMMPRIN levels were significantly lower in SV (847 +/- 190 pixels, 1,742 +/- 461 pixels) vs IMA conduits (2,590 + 403 pixels, 5,606 + 678 pixels), respectively (p < 0.05). MMP-9 activity was similar while MMP-2 activity was significantly increased in SV vs IMA specimens. CONCLUSIONS: SV and IMA conduits harbor the same MMP molecular constituents. However, MMP-2 levels and activity are significantly more abundant in the SV compared to the IMA. These differences may contribute to the early pathologic remodeling of the SV vs IMA conduit following CABG surgery.     

Aging increases aortic MMP-2 activity and angiotensin II in nonhuman primates

To seek evidence that the nonhuman primate arterial wall, as it ages in the absence of atherosclerosis, exhibits alterations in pathways that are involved in the pathogenesis of experimental atherosclerosis, we assessed aortic matrix metalloproteinase-2 (MMP-2) and its regulators, ie, membrane type-1 of matrix metalloproteinase (MT1-MMP) and tissue inhibitor of matrix metalloproteinase-2 (TIMP-2), and the expression of angiotensin II (Ang II), angiotensin-converting enzyme (ACE), and chymase in young (6.4+/-0.7 years) and old (20.0+/-1.9 years) male monkeys. With advancing age, (1) the intimal thickness increased 3-fold and contained numerous vascular smooth muscle cells and matrix, but no inflammatory cells; (2) the intimal MMP-2 antibody-staining fraction increased by 80% (P<0.01); (3) in situ zymography showed that MMP-2 activity, mainly confined to the intima, increased 3-fold (P<0.01); (4) the MT1-MMP antibody-staining fraction increased by 150% (P<0.001), but the TIMP-2 antibody-staining fraction did not significantly change; (5) steady levels of the mRNA-staining fraction (via in situ hybridization) for MMP-2 increased 7-fold, for MT1-MMP increased 9-fold, and for TIMP-2 increased 2-fold (all P<0.001); and (6) intimal Ang II and ACE immunofluorescence were increased 5-fold and 5.6-fold, respectively, and colocalized with MMP-2. Thus, age-associated arterial remodeling and the development and progression of experimental atherosclerosis in young animals share common mechanisms, ie, MMP-2 activation and increased Ang II signaling. This might explain, in part, the dramatically exaggerated prevalence and severity of vascular diseases with aging.     

白藜芦醇对大鼠脑缺血基质金属蛋白酶-9及其组织抑制因子-1表达的影响

目的探讨白藜芦醇在大鼠局灶性脑缺血再灌注损伤中对脑水肿的影响,及对基质金属蛋白酶-9(MMP-9)和基质金属蛋白酶组织抑制因子-1(TIMP-1)表达的影响。方法将健康雄性Wistar大鼠105只,随机分为假手术组(5只)、缺血再灌注组(对照组,50只)和白藜芦醇药物干预组(药物组,50只)。采用线栓法制作大鼠大脑中动脉闭塞模型,使用干湿重法测定脑含水量,免疫组织化学法观察MMP-9和TIMP-1的表达。结果药物组与对照组比较,脑组织含水量在缺血再灌注1、2、3天明显减轻,MMP-9和TIMP-1的表达在缺血再灌注1、2、3天明显减少,TIMP-1在再灌注6 h时亦减少,两组比较差异有显著性意义(P<0.05)。结论在缺血再灌注所致的血管损伤中白藜芦醇具有脑保护作用,通过抑制MMP-9的表达而减轻脑水肿,调节MMP-9和TIMP-1的活性可能是其作用机制之一。     

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。     

大鼠肝纤维化形成中基质金属蛋白酶2、9活性变化的病理意义

目的探讨大鼠肝纤维化形成中基质金属蛋白酶2、9(MMP 2、MMP 9)活性变化及其病理意义.方法采用二甲基亚硝胺4周1 2次腹腔注射制作大鼠肝纤维化模型,分别于造模后1、2、3 d、1、2、4、6、8周作为动态观察时相点;MMP-2和MM P-9活性测定采用酶谱法,透射电镜观察肝组织超微结构,免疫组织化学观察肝窦壁Ⅳ型胶原(CⅣ)、层黏连蛋白(LN)和Ⅰ型胶原(C I)表达,weste rn blot方法测定肝组织金属组织蛋白酶抑制剂2(TIMP 2)含量.结果造模后第2、3天,MMP 2、MMP 9活性(灰度值)显著增加(2 dMMP-2正常对照组为54.72±4.56,模型组为70.76±7.63,F=16.27,P＜0.05;MMP-9分别为25.72±4.29和51.76±15.33,F=13.38,P＜0.05).肝窦壁CⅣ(阳性面积比%)在造模第2、3天直至1周显著减少(2 d正常对照组为6.06±1.35,模型组为2.86±0.63,F=69.12,P＜0.05),4周末则显著增加(正常对照组为6.06±1.35,模型组为8.04±1.50,F=14.42,P＜0.05).MMP-9活性与肝窦壁CⅣ表达量呈显著负相关(r=-0.729,P＜0.05);肝窦壁LN沉积4周末达峰值;正常肝窦壁无C I表达,造模4周后肝窦壁C I呈阳性染色; 4周模型大鼠可见完整的基底膜形成;肝纤维化后期TIM P 2表达异常增加.结论早期MMP 9(主要的)、MMP 2活性升高,降解肝窦内皮细胞下正常分布的CⅣ,是肝窦毛细血管化形成的重要因素;后期T I M P-2表达增加,可能是该模型肝纤维化不易自行消退的原因之一.     

急性冠状动脉综合征患者外周血中脂联素水平与基质金属蛋白酶-9及其组织抑制因子-1关系的探讨

目的:探讨急性冠状动脉综合征患者(ACS)外周血中脂联素与基质金属蛋白酶-9(MMP-9)及基质金属蛋白酶组织抑制因子-1(TIMP-1)水平及其相关性的研究。方法:急性心肌梗死组19例,不稳定性心绞痛组31例,稳定性心绞痛组13例,正常对照组22例,检测各组外周血中脂联素、MMP-9、TIMP-1的浓度。各组间采用独立样本的t检验,各参数之间进行单因素的相关分析。结果:急性心肌梗死组、不稳定性心绞痛组分别与正常对照组比较:外周血清中脂联素的浓度、TIMP-1的浓度均显著降低(P<0.05～0.01),MMP-9/TIMP-1及MMP-9的浓度则均显著升高(P<0.05～0.01);急性心肌梗死组、不稳定性心绞痛组与稳定性心绞痛组比较,脂联素的浓度显著降低(P<0.05～0.01),MMP-9/TIMP-1升高(P<0.05～0.01);稳定性心绞痛组与正常对照组比较各指标间无明显差异。相关性分析中:脂联素与MMP-9之间无相关性(r=-0.248,P>0.05),脂联素与TIMP-1有显著相关性(r=0.408,P<0.01),脂联素与MMP-9/TIMP-1之间有显著相关性(r=-0.478,P<0.001)。结论:ACS患者中,脂联素的分泌减少,导致TIMP-1的分泌也减少,MMP-9/TIMP-1平衡破坏,可能是急性冠状动脉综合征发生的重要因素。