胃癌组织中基质金属蛋白酶及其组织抑制物的基因表达意义

目的观察胃癌组织及其癌变标本中基质金属蛋白酶（MMPs）及其金属蛋白酶组织抑制物（TIMPs）基因表达的变化。方法采用Northern—blot、原位分子杂交ISH的方法，对15例胃癌组织中MMP2、MMP9和TIMP1基因的mRNA表达水平进行了检测。结果胃癌癌组织MMP2、MMP9和TIMP1的基因表达水平明显高于正常组织。它们在胃癌癌组织和间质细胞中均有分布。结论组织中MMPs和TIMPs的异常表达有助于胃癌的早期诊断。     

基质金属蛋白酶-9和金属蛋白酶组织抑制物-1在IgA肾病肾组织中的表达

目的 探讨基质金属蛋白酶－9（MMP－9）／金属蛋白酶组织抑制物－1（TIMP－1）系统在IgA肾病肾组织中的表达及其对IgA肾病的进展的影响。方法 采用免疫组织化学和原位杂交技术,分别在蛋白质和基因水平检测38例IgA肾病患者肾组织中的MMP－9和TIMP－1的变化。结果 MMP－9在正常肾脏肾小球的脏层上皮细胞和内皮细胞有少量表达,在肾小管上皮细胞和间质血管壁也有少量表达;在IgA肾病中,MMP－9在系膜增殖性肾小球和间质血管壁的表达均明显增多（P＜0．001）,而在硬化肾小球内的表达则明显减少,肾小管细胞的MMP－9表达无明显变化。TIMP－1在正常肾组织中不能检出,在IgA肾病患者具有系膜增殖性病变的肾小球中有微量表达,在增殖在很重但尚未完全硬化的肾小球内表达增多,在肾小管间质表达最为明显（P＜0．001）,其主要见于肾小管细胞、间质细胞和血管内皮细胞。肾组织中的TIMP－1表达与血清肌酐水平呈显著相关（P＜0．05）,与肾小管间质的纤维化和炎细胞浸润程度亦明显相关（P值均＜0．01）。肾小球中的MMP－9表达与尿蛋白无明显相关性,但与血清肌酐水平呈显著负相关（P＜0．05）。结论 MMP－9和TIMP－1的异常表达可能是影响IgA肾病进展的因素之一。     

硫化氢通过调控转化生长因子-β及基质金属蛋白酶-9/基质金属蛋白酶抑制剂-1改善糖尿病大鼠肾小管间质纤维化

目的探讨硫化氢(H_2S)气体信号分子对糖尿病大鼠肾小管间质纤维化及转化生长因子(TGF)-β、基质金属蛋白酶(MMP)-9/基质金属蛋白酶抑制剂(TIMP)-1表达的影响。方法单次腹腔注射链脲佐菌素(STZ)建立糖尿病模型将成年雄性SD大鼠64只随机分为正常对照组(Control组)、STZ组、STZ+H_2S组、H_2S组。造模72 h后采尾静脉血检测,若血糖>16.7 mmol/L表明造模成功。H_2S组和STZ+H_2S组大鼠腹腔注射Na HS溶液100μmol·kg~(-1)·d~(-1),Control组和STZ组腹腔注射同等量生理盐水。8 w后取标本,Masson染色观察大鼠肾脏组织病理形态学改变,Western印迹检测大鼠肾脏TGF-β、MMP-9、TIMP-1、Ⅳ型胶原蛋白的表达水平。结果与Control组相比,STZ组存在明显肾小管间质纤维化,同时肾脏组织中Ⅳ型胶原、TGF-β、TIMP-1蛋白的表达升高,MMP-9蛋白的表达水平下降(P<0.05);与STZ组大鼠相比,STZ+H_2S组肾小管间质纤维化减轻,肾组织TGF-β、TIMP-1、Ⅳ型胶原蛋白的表达降低,MMP-9蛋白表达水平升高(P<0.05)。结论 H_2S可改善糖尿病大鼠肾小管间质纤维化,其机制可能与调控MMP-9/TIMP-1失衡以及TGF-β蛋白的表达水平有关。     

慢性肾小球疾病患者肾组织基质金属蛋白酶-2、3及其抑制物-1、2的表达

近几年的研究发现 ,肾小球疾病的发展和预后不仅与肾小球本身的损害有关 ,更与肾小管 间质病变程度密切相关[1] 。而细胞外基质 (ECM )的合成和降解在间质纤维化中的作用日益受到重视 ,基质金属蛋白酶 (MMPs)及其抑制物(TIMPs)是调节ECM动态平衡的最重要的一大酶系[2 ] 。本研究通过观察慢性肾小球肾炎患者肾组织中MMP 2、MMP 3及TIMP 1、TIMP 2的表达 ,及其与肾间质损害程度的相关性、与系膜增生程度和蛋白尿的关系 ,探讨其在肾炎发病机制及肾小球间质纤维化中的作用。一、对象1.肾病组 :我院 1998年至 2 0 0 0年间住院的 2 0 …     

组织金属蛋白酶抑制物在老年大鼠肾小管间质病理损害中的动态变化

目的研究组织金属蛋白酶抑制物(TIMPs)及基质金属蛋白酶(MMPs)在不同鼠龄单侧输尿管梗阻(UUO)大鼠肾小管间质中的表达变化,探讨其在老年大鼠肾小管间质损害中的作用. 方法选用3月龄(青年)、26月龄(老年)大鼠制备UUO模型,采用病理及免疫组化等方法动态观察不同年龄大鼠UUO术后3、7、14d梗阻侧肾脏的组织学变化和TIMP-1、TIMP-2 、MMP-2、MMP-9等在梗阻肾小管间质中的表达情况. 结果 TIMP-1、TIMP-2及MMP-2、MMP-9主要表达于肾小管上皮细胞和间质细胞.在对照组中,TIMP-1、TIMP-2仅微弱表达于青年鼠肾脏中,而在老年大鼠肾脏中其表达显著增加(TIMP-1 0.84±0.23 vs 2.17±0.85,P<0.01; TIMP-2 0.93±0.12 vs 2.31±0.87,P<0.01),MMP-2、MMP-9在正常青年鼠与老年鼠肾脏中均有表达,二者之间差异无显著性(P＞0.05).与对照组相比,3、26月龄大鼠梗阻侧肾脏的TIMP-1、TIMP-2及MMP-2、MMP-9在术后各时间点的表达均显著增高(P<0.01),肾小管间质纤维化面积随UUO术后时间的延长而增加,且TIMP-1、TIMP-2的表达与肾小管间质纤维化面积呈正相关(TIMP-1,r=0.816,P<0.01; TIMP-2, r=0.851, P<0.01).与3月龄UUO大鼠比较,26月龄UUO大鼠TIMP-1、TIMP-2在肾小管间质中各时间点的表达均显著增高(P<0.01),肾小管间质纤维化面积在各时间点也明显增加(P<0.01). 结论 TIMPs的高表达所致的MMPs/TIMPs比例失调可能促进老年大鼠肾小管间质损害的进程.     

和血柔肝方对肝纤维化大鼠基质金属蛋白酶及其抑制物表达影响的实验研究

目的:观察和血柔肝方(HXRGF)对肝纤维化(LF)大鼠基质金属蛋白酶(MMPs)及其特异性抑制物(TIMPs)的影响，评估HXRGF对LF的疗效。方法:将80只SPF级雄性SD大鼠随机分为正常对照组(CL,n=10)和肝纤维化模型组(FL,n=70),在大鼠颈背部皮下以60%CCl₄溶液(CCl₄∶Olive oil=3∶2,3 ml/kg体重，每周2次)连续注射12周进行造模。造模成功后，原FL组大鼠被随机分为模型组、秋水仙碱组、HXRGF低剂量组、HXRGF中剂量组和HXRGF高剂量组，每组10只，分别给予相应的受试药液灌胃4周(1次/d)。比较各组大鼠的体质量、肝功能、病理Metavir评分和肝组织中MMP2、MMP13、TIMP1、TIMP2、TGFβ及Lect2的mRNA和蛋白表达量的差异。结果:(1)与对照组相比，模型组大鼠的肝脏形态、HE染色、免疫组化和羟脯氨酸测定结果提示肝纤维化模型复制成功，其体质量下降、肝功能恶化、病理Metavir评分升高，MMP2、MMP13、TIMP1、TIMP2、TGFβ和Lect2 mRNA水平...     

肿瘤坏死因子-a和基质金属蛋白酶介导心肌间质重塑的作用机制及对其药物干预的研究

心肌细胞外基质的合成与降解主要与位于其间的Zn^2 依赖基质金属蛋白酶(MMPs)及其特异性组织抑制剂(TIMPs)活性有关。有体外实验证实，炎性细胞因子肿瘤坏死因子-a(TNF-a)可诱导心肌成纤维细胞MMPs、TIMPs的基因表达和活化。本实验在大鼠心肌梗死(MI)模型上探讨心肌局部TNF-a表达、MMP／TIMP系统的变化与心肌间质     

基质金属蛋白酶在类似人类2型糖尿病大鼠肾病中的研究

目的 动态研究基质金属蛋白酶－2（MMP－2）和其体内特异的抑制物－金属蛋白酶组织抑制剂－2（TIMP－2）在类似人类2型糖尿病大鼠肾组织的改变。方法 利用免疫组织化学观察Ⅳ型胶原在肾小球的表达,酶谱法测定肾皮质MMP－2的活性,蛋白印迹法检测肾皮质TIMP－2的含量,Northern Blot观察肾皮质MMP－2和TIMP－2的基因表达。结果 类似人类2型糖尿病大鼠肾小球Ⅳ型胶原成分表达增强,肾皮质MMP－2基因表达减弱（P＜0．01）;其活性进行性减少（P＜0．0001）,而TIMP－2基因表达（P＜0．01）及其含量逐渐增加（P＜0．01）。结论 类似人类2型糖尿病大鼠肾组织MMP－2活性进行性降低、TIMP－2含量增加,两者比例失衡为肾小球ECM成份沉积的重要原因之一,基质降解减弱也参与了2型糖尿病大鼠肾脏病变的发生和发展。     

基质金属蛋白酶在阿霉素心肌病左室重构中的表达与意义

目的:研究基质金属蛋白酶(MMPs)及金属蛋白酶组织抑制因子(TIMPs)在阿霉素心肌病(ADR DCM)大鼠左室心肌中的表达与意义。方法:雄性Wistar大鼠分两组:正常对照组(n=10)和ADR DCM组(n =25)。ADR DCM模型建立方法:阿霉素2.5mg/kg,尾静脉注射,每周1次,连续10周。12周时进行超声检测 评价其心功能,硫代巴比妥酸法检测丙二醛(MDA)含量,逆转录 聚合酶链反应、Western印迹分析检测MMP 2、 MMP 9及TIMP 1的表达。结果:ADR DCM组大鼠死亡率40%,左室舒张末期内径及收缩末期内径增加,左室 短轴缩短率明显下降,MDA含量增加(P<0.01)。ADR DCM组大鼠左室心肌MMP 2、MMP 9mRNA及蛋白 水平表达较正常对照组明显升高(P<0.01),而TIMP 1的表达在两组间均无统计学意义(P>0.05)。结论: ADR DCM左室心肌MMPs表达上调,MMPs可能参与ADR DCM左室重构和心力衰竭的发生发展。     

基质金属蛋白酶及组织金属蛋白酶抑制剂与类风湿性关节炎

基质金属蛋白酶(MMPs)是降解细胞外基质(ECM)的一种重要的蛋白酶,对类风湿性关节炎的发生、发展有重要作用.组织金属蛋白酶抑制剂(TIMPs)是MMPs的天然抑制物,MMPs/TIMPs两者比例可作为反映疾病活动程度及预后的重要指标.     

Matrix metalloproteinases and tissue inhibitors of metalloproteinases in colonic adenomas-adenocarcinomas

Colonic adenocarcinomas evolve through a multistep process from tubular adenomas to invasive adenocarcinomas. Matrix metalloproteinases (MMPs) have been implicated in proteolysis of basement membrane for initiation of metastatic cascade. METHODS: By immunocytochemical staining, hyperplastic polyps, tubular adenomas, tubovillous adenomas, villous adenomas to adenocarcinomas were systematically examined for the presence of MMP-2 (gelatinase A) and MMP-9 (gelatinase B) and tissue inhibitor of MMP (TIMP)-1 and TIMP-2, respectively. RESULTS: MMP-2 and MMP-9, and TIMP-1 and TIMP-2 were immunolocalized in scattered stromal cells, whereas epithelial cells of normal mucosa and hyperplastic polyps were weakly stained. From tubular adenomas to villous adenomas, immunolocalization of gelatinases and TIMPs showed increasing gradually, and in situ carcinomas showed a definite positive, immunolocalization of gelatinases and TIMPs. CONCLUSION: Increasing immunolocalization of gelatinases and TIMPs from tubular adenomas to adenocarcinomas coincides with a multistep process of colonic tumorigenesis.Presented in part at the 20th International Congress of International Academy of Pathology, Hong Kong, China, October 9 to 14, 1994.     

基质金属蛋白酶及其抑制因子与肝纤维化

肝纤维化是各种慢性肝病向肝硬化发展的共同病理过程，其实质是以Ⅰ、Ⅲ型胶原为主的细胞外基质（extracellular matrix，ECM）合成与降解失衡，导致ECM在肝内过度沉积。研究表明，基质金属蛋白酶类（matrix metalloproteinases，MMPs）和金属蛋白酶组织抑制因子（tissue inhibitors of metalloproteinases，TIMPs）两者的平衡在ECM的合成与降解中发挥着重要的作用。     

Occurrence of matrix metalloproteinases and tissue inhibitors of metalloproteinases in tuberculous pleuritis

OBJECTIVE: Matrix metalloproteinases (MMP) and tissue inhibitors of metalloproteinases (TIMP) have been found in high concentrations in pleural effusions. Because MMP and TIMP may play a part in the causation of the fibrosis seen in tuberculous (TB) pleuritis their occurrence was examined. DESIGN: Pleural effusion fluid and plasma concentrations of MMP-1, MMP-2, MMP-3, MMP-8, MMP-9, TIMP-1 and TIMP-2 were determined by ELISA in 21 patients with TB pleuritis. To adjust for the total protein content, respective ratios were calculated. Activities of MMP-2 and MMP-9 were measured by gelatine zymography and the MMP-9/MMP-2 ratios calculated. Pleural effusions and plasma of 15 patients with congestive heat failure (CHF) and plasma of 15 healthy persons (CON) served as controls. RESULTS: Immunoreactive pleural fluid concentrations of MMP-1, MMP-2, MMP-8, and MMP-9 were higher in TB compared to CHF, but plasma concentrations were not different between the groups. TB pleural fluid concentrations of MMP-1, MMP-2, TIMP-1, and TIMP-2 were higher compared to TB plasma. MMP-3 was found in trace amounts only. The MMP-9/total protein ratios in pleural fluid were higher in TB compared to CHF (0.4492+/-0.1633 vs 0.0364+/-0.0145, P<0.005) but the TIMP-1 ratios were lower (139.0+/-28.7 vs 517.8+/-183.7, P<0.0005). In TB pleural fluid vs TB plasma, the respective MMP-1, MMP-2, TIMP-1, and TIMP-2 ratios were increased (0.46+/-0.10 vs 0.17+/-0.02; 25.2+/-2.8 vs 4.2+/-0.9; 139.0+/-28.7 vs 27.8+/-8.2; 0.67+/-0.13 vs 0.18+/-0.04, P<0.0005 each). Gelatine zymography demonstrated MMP-2 and MMP-9 bands of different brightness in TB effusions but in CHF effusions the MMP-9 band was barely visible. The MMP-9/MMP-2 effusion ratios were therefore higher in TB compared to CHF (0.46+/-0.15 vs 0.05+/-0.04, P<0.0005). CONCLUSION: Compartmentalized MMP-1, MMP-2, TIMP-1, and TIMP-2 and, compared to CHF, a surplus of MMP-1, MMP-2, MMP-8, and MMP-9 in the pleural space obviously contribute to the fibrotic reactions in TB pleuritis.     

Matrix metalloproteinases and the thyroid.

Matrix metalloproteinases (MMPs) are proteolytic enzymes that degrade components of the extracellular matrix (ECM) and basement membrane. They play a critical role in many physiological and pathological processes, such as tumor metastasis. The original concept-that MMP activity during metastasis is restricted solely to invasion of the basement membrane and destruction of ECM components-has been modified to encompass multiple aspects of tumor progression: tumor establishment, growth, angiogenesis, intravasation, extravasation, and almost all metastatic steps. Moreover, the role of tissue inhibitors of matrix metalloproteinases (TIMPs), originally believed to exhibit anti-invasion properties solely by virtue of their inhibition of MMPs, has been extended to include their multiple biological effects, such as growth promotion. In thyroid neoplasia as well, MMPs, in particular MMP-2, seem to be associated with metastatic potential. It would seem that similar and divergent patterns regulate MMP and TIMP gene expression in benign and malignant human thyrocytes, in many instances in agreement with the concept of MMPs playing the role of stimulating, and TIMPs inhibiting cell invasion.     

Relationships between matrix metalloproteinases and tissue inhibitor of metalloproteinases in the wall of abdominal aortic aneurysms.

AIM: The pathologic feature of aortic aneurysm is considered to be the remodeling of the aortic wall, involving fragmentation and decrease of elastic fibers in the tunica media. Matrix metalloproteinases (MMPs), particularly MMP-2 and MMP-9, have been implicated in collagen and elastin degeneration within the aortic wall. The precise relationship among MMPs and tissue inhibitor of metalloproteinases (TIMPs) is still unclear. We have studied the expression of MMP-2, MMP-9 tissue inhibitor of metalloprotein-1 (TIMP-1), TIMP-2 and membrane type 1-MMP (MT-1-MMP) in the wall of small AAAs (30-45 mm), large AAAs (>45 mm) and controls (<25 mm). We investigated the relationship among expressions of MMP-2, TIMP-2 and MT1-MMP in the walls. METHODS: The aortic walls in the patients with AAA were harvested from the maximum diameter, while the aortic walls in autopsy cases were harvested as controls. We analyzed tissue distribution of cell types by immunochemistry, protein expression by Western blotting and mRNA expression by competitive polymerase chain reaction. RESULTS: They consisted of 11 in controls, 8 in small AAAs and 26 in large AAAs. Among the MMPs-positive-cells, mainly macrophage, MMP-2-positive cells were in the intima, but MMP-9-positive cells in the intima and adventitia. In the small size, MMP-2 and MMP-9 mRNA were higher than those of control. In the large size, MT1-MMP and MMP-9 mRNA were higher than those of the controls. In the mRNA level of the whole AAA, significant correlations were present between MMP-2 and MMP-9, between MMP-2 and TIMP-1, and between MMP-9 and TIMP-1. These expressions were confirmed by Western blotting. CONCLUSION: We concluded as follows: 1) MMP-2 and MMP-9 may play an important role in the developmental process of AAA. 2) TIMP-1 plays an important role of interacting MMP-2 and/or MMP-9. 3) MMP-2 and MT1-MMP may play an important role in the early stages of AAAs.     

Matrix metalloproteinases in the vein wall.

AIM: Matrix metalloproteinases contribute to extracellular matrix remodelling that can influence mechanical properties of the vein wall and predispose to varicose veins development. The aim of the study was to assess the following matrix metalloproteinases in the wall of varicose veins: tissue collagenase I (MMP-1), gelatinase A (MMP-2), gelatinase B (MMP-9) and stromelysin 1 (MMP-3). METHODS: Normal, varicose and varicose veins complicated by thrombophlebitis were collected during the surgical treatment of 26 patients. In harvested tissues the presence of gelatinases was detected with zymography, contents of MMP-1, MMP-2, MMP-3 and MMP-9 were evaluated with ELISA, activity of MMP-1 was assessed with HPLC and activity of MMP-2 with ELISA. RESULTS: Zymography demonstrated particularly high contents of both gelatinases in the wall of varicose veins complicated by thrombophlebitis. The contents of MMP-1, MMP-2 and MMP-9 were significantly increased only in the wall of varicose veins complicated by thrombophlebitis, whereas the increased content of MMP-3 was also found in the wall of varicose veins. A significantly higher activity of MMP-1 was shown only in the wall of varicose veins complicated by thrombophlebitis, whereas an active form of MMP-2 was increased in the wall of varicose, as well as varicose veins complicated by thrombophlebitis, when compared with normal ones. CONCLUSION: The wall of varicose veins, particularly those complicated by thrombophlebitis shows extensive alterations in the content and activity of matrix metalloproteinases, that may result in extracellular matrix remodelling, influence mechanical properties of the vein wall and predispose to further progression of the disease.