基质金属蛋白酶及其组织抑制物与肝纤维化

基质金属蛋白酶(matrix metalloproteinases,MMPs)是降解细胞外基质(ECM)的主要蛋白酶。基质金属蛋白酶组织抑制物(tissue inhibitors of metalloproteinases,TIMPs)是组织中MMPs主要的内源性抑制因子,至今共有4种。肝纤维化早期MMPs轻度升高;而肝纤维化的中晚期,MMPs活性则明显降低,TIMPs的表达显著增加。一旦肝纤维化逆转,MMPs的表达又显著增强,而TIMPs的表达逐渐降低。表明MMPs和TIMPs与肝纤维化的发生和发展密切相关。     

基质金属蛋白酶及其组织抑制物与肝纤维化

基质金属蛋白酶(matrix metalloproteinases，MMPs)是降解细胞外基质(ECM)的主要蛋白酶。基质金属蛋白酶组织抑制物(tissue inhibitors of metalloproteinases，TIMPs)是组织中MMPs主要的内源性抑制因子，至今共有4种。肝纤维化早期MMPs轻度升高；而肝纤维化的中晚期，MMPs活性则明显降低，TIMPs的表达显增加。一旦肝纤维化逆转，MMPs的表达又显增强，而TIMPs的表达逐渐降低。表明MMPs和TIMPs与肝纤维化的发生和发展密切相关。     

基质金属蛋白酶及其抑制物与肝纤维化

肝纤维化(liverfibrosis)是继发于肝脏炎症或损伤后组织修复过程中的代偿反应,由肝脏细胞外基质(ECM)蛋白聚集所致。这种聚集可以是ECM在肝组织内的沉积增加或降解减少的结果。其中,基质金属蛋白酶(MMPs)及其抑制物(TIMPs)在ECM的合成和降解中扮演着重要角色,并为抗纤维化治疗开辟新的途径。     

基质金属蛋白酶及其抑制物与肝纤维化

肝纤维化(liver fibrosis)是继发于肝脏炎症或损伤后组织修复过程中的代偿反应，由肝脏细胞外基质(ECM)蛋白聚集所致。这种聚集可以是ECM在肝组织内的沉积增加或降解减少的结果。其中，基质金属蛋白酶(MMPs)及其抑制物(TIMPs)在ECM的合成和降解中扮演着重要角色，并为抗纤维化治疗开辟新的途径。     

肝纤维化基质金属蛋白酶-26/基质金属蛋白酶抑制因子-1 mRNA的表达

基质金属蛋白酶（MMPs）是一组能降解细胞外基质（ECM）的酶，该家族的一些酶是迄今为止已发现的惟一能分解纤维类胶原的酶类，MMP-26是MMPs家族的一个新成员，又称endometase或matrilysin-2，MMP-26可能参与一系列与组织重建有关的事件。基质金属蛋白酶组织抑制因子（TIMP）是一组能特异性抑制MMPs活性的低分子蛋白质，     

慢性阻塞性肺疾病血清基质金属蛋白酶-9和组织型金属蛋白酶抑制物-1的检测及其意义

目的 检测慢性阻塞性肺疾病(chronic obstructive pulmonary disease,COPD)急性加重期、稳定期患者和健康对照者血清中基质金属蛋白酶-9 (matrix metalloproteinase-9,MMP-9)和组织型金属蛋白酶抑制物-1 (tissue inhibitor of met...     

基质金属蛋白酶与肝纤维化的研究进展

肝纤维化是慢性肝脏疾病的重要病理特征，主要由于肝脏细胞外基质代谢失衡，合成超过降解所致，肝纤维化和原代细胞培养的早期，肝星状细胞（HSC）短暂表达基质金属蛋白酶－3（MMP－3）、MMP－13和尿激酶型纤溶酶原激活物（uPA)并表现为降解基质的表型，肝纤维化进展期和HSC培养的晚期，HSC可表达降解正常肝基质，但抑制肝纤维化中沉积的胶原纤维降解的MMPs成分，同时金属蛋白酶组织抑制物(TIMPs)的表达增加，抑制MMPs的活性，肝纤维化恢复期TIMPs迅速下调，MMPs活性增加。肝基质降解，导致肝纤维化消退。     

基质金属蛋白酶-2及其抑制物在慢性肝炎和肝硬化肝组织中的表达

为进一步探讨基质金属蛋白酶-2（MMP-2）和基质金属蛋白酶-2组织抑制因子（TIMP-2）在肝纤维化发生，发展过程中的作用，用免疫组织化学方法检测慢性肝炎和肝硬化肝组织中MMP-2和TIMP-2的表达及分布状态，并作定位及半定量分析。     

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 …     

免疫性肝纤维化中肝组织基质金属蛋白酶-1及其抑制因子-1的表达

正常肝脏细胞外基质的合成和溶解维持着动态平衡 ,基质金属蛋白酶 1(ＭＭＰ 1)及金属蛋白酶抑制因子 1(ＴＩＭＰ 1)起着重要的调节作用 ,当二者比例失调时 ,Ⅰ、Ⅲ型胶原降解减少而沉积[1,2 ] ,形成肝纤维化。我们应用ＥＬＩＳＡ方法在大鼠免疫性肝纤维化形成的不同时期同步测定ＭＭＰ 1、ＴＩＭＰ 1的蛋白表达 ,旨在进一步了解二者的动态变化及其作用。一、材料和方法1.主要试剂 :2 0 %人白蛋白 (ＨＳＡ ,ＡｒｍｏｕｒＰｈａｒｍａｃｅｕｔｉ ｃａｌＣｏｍｐａｎｙ ,ＵＳＡ) ;ＭＭＰ 1及ＴＩＭＰ 1测定 (ＥＬＩＳＡ)试剂盒 (ＴＰＩＩｎＣ…     

TIMP-1 ELISA检测方法条件的优化研究

目的进一步研究酶联免疫吸附方法（ELISA）检测人血清中基质金属蛋白酶组织抑制剂-1（TIMP-1）的最优化试验条件。同时最大程度降低成本，使血清TIMP-1ELISA国产试剂盒价格、质量更优。方法用抗人TIMP-1单克隆抗体（mAb），辣根过氧化物酶（HRP）标记的抗TIMP-1，通过选用国产酶联板及对酶联板进行紫外线辐照处理，改变固相化条件；通过对抗体包被时间、样本温育时间等条件优化，建立简便、快速、准确的ELISA定量技术。同时复检临床408例肝病患者血清，并与优化前检测结果做以比较。结果改变固相化条件，并延长包被时间至48h，抗原抗体反应时间为37℃ 2h，可获得更佳的血清TIMP-1定量结果。结论优化后的TIMP-1测定方法在敏感性、重复性及标准曲线线性关系更好，可提高临床肝纤维化血清阳性检出率。     

拉米夫定对慢性乙型肝炎肝纤维化的治疗作用(I)对血清肝纤维化指标的影响

目的　探讨拉米夫定治疗慢性乙型肝炎对血清肝纤维化指标的影响。方法　对 40例慢性乙型肝炎服药0、3、6、9、12个月进行动态测定血清透明质酸 (HA)、层粘蛋白 (LN )、Ⅲ型前胶原 (PⅢP)和Ⅳ型胶原 (ⅣC)。结果　 4项血清肝纤维化指标随着治疗时间延长不断下降 ,第 12个月时最明显 ,其中以HA最为显著 ,6个月复常率为 3 6.4% (8/2 2 ,P <0 .0 5 ) ,12个月复常率为 81.8% (18/ 2 2 ,P <0 .0 1) ,与ALT、AST复常率具有很好的相关性。按血清学疗效标准评价 ,6个月显效为 12 .5 % (5 / 40 ) ,有效为 12 .5 % (5 / 40 ) ,总有效率为 2 5 % (10 / 40 ) ;12个月显效为 42 .5 % (17/ 40 ,P <0 .0 5 ) ,有效为 2 7.5 % (11/ 40 ) ,总有效率为 70 % (2 8/ 40 ,P <0 .0 1)。结论拉米夫定治疗慢性乙型肝炎具有较好的近期抗肝纤维化作用。     

慢性乙型肝炎与慢性丙型肝炎患者临床和肝组织病理学特征分析

目的 分析慢性乙型肝炎（CHB）与慢性丙型肝炎（CHC）患者临床特征及肝组织病理学表现的差异。方法 2013年~2017年我院诊治的CHB患者300例和CHC患者100例,收集临床资料并行肝活检组织病理学检查。结果 本组资料显示,CHC患者年龄显著大于【（47.6±12.8）岁对（36.3±9.7）岁】、病程显著长于【（13.1±0.9）年对（6.2±1.8）年】、基础疾病显著多于（39.0%对18.7%）、经血感染显著多于（63.0%对36.7%）、母婴传播显著少于（3.0%对29.7%）、吸毒感染显著多于（40.0%对7.0%）和性传播显著少于（14.0%对26.7%）CHB患者（P<0.05）;CHB患者血清ALT水平为（76.5±10.8） U/L,AST水平为（111.2±21.3） U/L,与CHC患者的【（105.2±20.8） U/L和（98.3±20.1） U/L】比,差异显著（P<0.05）;CHC患者肝组织炎症分级>G2者为83.0%,显著高于CHB患者的48.7%（P<0.05）,而肝纤维化分期>S2者为65.0%,也显著高于CHB患者的28.3%（P<0.05）。结论 CHC患者由于病程长,发病隐匿,肝组织损伤更明显,需要积极的治疗。     

慢性乙型肝炎肝组织中MMP-2、TIMP-1与肝纤维化关系的研究

为了研究慢性乙型肝炎患者肝纤维化与肝组织中基质金属蛋白酶-2(MMP-2)及其天然抑制物金属蛋白酶组织抑制剂-1(TIMP-1)的关系,对60例慢性乙型肝炎患者进行肝组织病理活检,其中S_110例,S_224例,S_312例,S_414例。采用苦叶酸天狼猩红染色检测胶原面积百分比,单克隆抗体(McAb)免疫组织化学染色检测MMP-2、TIMP-1阳性细胞的方法进行病理分析。结果显示：慢性乙型肝炎肝组织中胶原面积百分比与肝组织纤维化分期正相关(r=0．885,P=0．000);慢性乙型肝炎肝组织中MMP-2与肝纤维化的分期无关(r=0．034,P= 0．896);慢性乙型肝炎肝组织中TIMP-1和肝纤维化的分期正相关(r=0．760,P=0．000);慢性乙型肝炎肝组织中MMP-2/TIMP-1和肝纤维化分期负相关(r=-0．674,P=0．000)。总之,TIMP-1参与了慢性乙型肝炎肝纤维化纤维化的过程,而MMP-2/TIMP-1是诊断肝纤维化的比较合适的指标。     

Clinical evaluation of serum tissue inhibitor of metalloproteinases-1 levels in patients with liver diseases

Serum levels of the tissue inhibitor of metalloproteinases-1 (TIMP-1) were measured in 268 patients with liver diseases by means of a one-step sandwich enzyme immunoassay. In the cases of acute hepatitis, chronic active hepatitis (CAH), liver cirrhosis (LC) and hepatocellular carcinoma (HCC), the levels of TIMP-1 were higher than those of the control group. Tissue inhibitor of metalloproteinases-1 levels correlated with type III procollagen peptide and with type IV collagen, indicating TIMP-1 as a useful marker for hepatic fibrosis. Levels of TIMP-1 also correlated with aspartate aminotransserase and alanine aminotransferase levels and showed the highest levels in acute hepatitis. Thus, TIMP-1 might also reflect hepatic inflammation. Serum levels of α-fetoprotein and TIMP-1 had a significant positive correlation in patients with HCC. A cut-off level of TIMP-1 between LC and HCC was set at 440 ng/mL, having a low sensitivity and a high specificity. These results suggest the usefulness of TIMP-1 as a tumour marker in cases of HCC where α-fetoprotein levels are not elevated.     

Clinical significance of connective tissue growth factor in hepatitis B virus-induced hepatic fibrosis

AIM: To determine the utility of connective tissue growth factor (CCN2/CTGF) for assessing hepatic fibrosis in hepatitis B virus (HBV)-induced chronic liver diseases (CLD-B).METHODS: Enzyme-linked immunosorbent assay was used to measure CCN2 in sera from 107 patients with chronic hepatitis B (CHB) and 39 patients with HBV-induced active liver cirrhosis and 30 healthy individuals. Liver samples from 31 patients with CHB, 8 patients with HBV-induced liver cirrhosis and 8 HBV carriers with normal liver histology were examined for transforming growth factor β-1 (TGF-β1) or CCN2 mRNA levels by in situ hybridization, and computer image analysis was performed to measure integrated optimal density (IOD) of CCN2 mRNA-positive cells in liver tissues. Histological inflammation grading and fibrosis staging were evaluated by H and E staining and Van Gieson’s method.RESULTS: Serum CCN2 concentrations were, respectively, 4.0- or 4.9-fold higher in patients with CHB or active liver cirrhosis as compared to healthy individuals (P < 0.01). There was good consistency between the levels of CCN2 in sera and CCN2 mRNA expression in liver tissues (r = 0.87, P < 0.01). The levels of CCN2 in sera were increased with the enhancement of histological fibrosis staging in patients with CLD-B (r = 0.85, P < 0.01). Serum CCN2 was a reliable marker for the assessment of liver fibrosis, with areas under the receiver operating characteristic (ROC) curves (AUC) of 0.94 or 0.85 for, respectively, distinguishing normal liver controls from patients with F1 stage liver fibrosis or discriminating between mild and significant fibrosis.CONCLUSION: Detection of serum CCN2 in patients with CLD-B may have clinical significance for assessment of severity of hepatic fibrosis.     

Expression of matrix metalloproteinase-2 and tissue inhibitor of metalloproteinase-1 in hepatic stellate cells during rat hepatic fibrosis and its intervention by IL-10

AIM: To investigate the expression of matrix metallopr-oteinase-2 and tissue inhibitor of metalloproteinase-1 in hepatic fibrosis and the antifibrogenic role of exogenous interleukin-10 (IL-10). METHODS: Hepatic fibrosis was induced by CCI4 administration and 60 male Sprague-Dawley rats were randomly divided into normal control group (group N, 8 rats), CCI4-induced group (group C, 28 rats) and IL-10-treated group (group I, 24 rats). At the beginning of the 7th and 11th wk, rats in each group were routinely perfused with pronase E and type IV collagenase through portal vein catheter and the suspension was centrifuged by 11% Nycodenz density gradient to isolate hepatic stellate cells (HSCs). RT-PCR was used to analyze mRNA of MMP-2 and TIMP-1 from freshly isolated cells. Densitometric data were standardized with β-actin signals. Immunocytochemistry was performed to detect MMP-2 and TIMP-1 expression in HSC cultured for 72 h. RESULTS: Compared to group N in the 7th wk, MMP-2 and TIMP-1 mRNA increased in group C (P= 0.001/0.001) and group I (P= 0.001/0.009). The level of MMP-2 and TIMP-1 mRNA in group I was significantly lower than that in group C (P= 0.001/0.001). In the 11th wk, MMP-2 mRNA in group I was still lower than that in group C (P = 0.005), but both dropped compared with that in the 7th week (P = 0.001/0.004). TIMP-1 mRNA in group I was still lower than that in group C (P= 0.001), and increased in group C (P= 0.001) while decreased in group I (P = 0.042) compared with that in the 7th wk. Same results were found by immunocytochemistry. CONCLUSION: Expression of MMP-2 and TIMP-1 is increased in hepatic fibrosis. IL-10 exhibits an antifibrogenic effect by suppressing MMP-2 and TIMP-1 expression.     

复方牛胎肝提取物治疗慢性乙型肝炎患者对肝纤维化指标的影响

目的观察复方牛胎肝提取物片治疗慢性乙型肝炎患者对肝纤维化指标的影响。方法选取153例慢性乙型肝炎患者,分别给予复方牛胎肝提取物、复方鳖甲软肝片和一般护肝治疗,观察3个月。结果复方牛胎肝提取物和复方鳖甲软肝片治疗患者肝功能指标改善,明显优于对照组;两组患者血清HA、LN、PcIII、cIV、血清TIMP-2和HYP水平明显下降,优于对照组;复方牛胎肝提取物与复方鳖甲软肝片治疗患者的上述指标变化无显著性差异。结论复方牛胎肝提取物能有效降低患者肝纤维化指标,改善患者肝功能,有明显的抗肝纤维化疗效。