基质金属蛋白酶及其抑制因子在胎儿皮肤内的表达特征及其意义

目的探讨基质金属蛋白酶-2（MMP-2）、MMP-3、MMP-9及金属蛋白酶组织抑制因子-1（TIMP-1）、TIMP-2在不同发育时期胎儿皮肤中的表达特征及其可能的生物学意义。方法24例被测标本中包括不同胎龄（12～40周）的胎儿皮肤。用免疫组化方法和病理技术检测这5种蛋白在胎儿皮肤中定位和表达量的变化规律。结果MMP-2、MMP-3、MMP-9、TIMP-1和TIMP-2在不同时期的胎儿皮肤内均有表达，它们主要分布于表皮细胞、成纤维细胞、毛囊和汗腺上皮细胞以及血管内皮细胞的胞浆中。在早期（胎龄12～18周）妊娠胎儿皮肤中，MMP-2、MMP-3、MMP-9蛋白呈强阳性表达，随着胎儿生长发育，这些蛋白的阳性率逐渐降低，在晚期（胎龄27～40周）妊娠胎儿皮肤中这些蛋白的阳性细胞率均明显低于早期妊娠胎儿（P均〈0．05）。TIMP-1和TIMP-2呈相反的变化规律，在早期妊娠胎儿皮肤中表达水平较低，而在晚期妊娠胎儿皮肤中这两种蛋白阳性细胞率增大，显著高于早期妊娠胎儿（P均〈0．05）。结论MMP-2、MMP-3、MMP-9、TIMP-1和TIMP-2可能对皮肤的发生、结构功能的维持以及创伤后修复起重要作用。在早期妊娠胎儿皮肤中，MMP-2、MMP-3、MMP-9高表达以及TIMP-1和TIMP-2低表达可能与胎儿皮肤创面无瘢痕愈合密切相关。     

输卵管绒毛膜癌4例临床病理分析

绒毛膜癌是细胞滋养细胞、中间型滋养细胞及合体滋养细胞混合性增生的恶性肿瘤.绒毛膜癌50%继发于完全性水泡状胎块,25%发生于正常妊娠及25%发生于流产后[1].     

MMP-2、MMP-9、TIMP-1在侵袭性垂体瘤中的表达

目的探讨基质金属蛋白酶MMP-2、MMP-9及其抑制物TIMP-1与垂体瘤侵袭性的关系.方法应用免疫组化方法(SP法)检测了19例侵袭性垂体瘤,6例非侵袭性垂体瘤中MMP-2、MMP-9、TIMP-1的表达,分析了这3个指标与垂体瘤侵袭性的关系.结果MMP-2、MMP-9的表达在侵袭性垂体瘤组明显高于非侵袭性垂体瘤组(P＜0.05).TIMP-1的表达在侵袭性垂体瘤组中有增加的趋势,但与非侵袭性垂体瘤相比,无统计学意义(P＞0.05).结论在垂体瘤的侵袭性生物行为中,基质金属蛋白酶MMP-2、MMP-9,可能扮演着重要角色.     

p57^KIP2在完全性与部分性水泡状胎块中的表达及意义

目的 研究p57KIP2在完全性水泡状胎块(CHM)与部分性水泡状胎块(PHM)中的表达情况,探讨其在水泡状胎块诊断中的意义.方法 采用免疫组化方法 检测p57KIP2在43例CHM及32例PHM组织中的表达情况,同时选取5例正常胎盘及5例水肿性流产胎盘组织作为对照.结果 ①p57KIP2表达呈组织异质性.在PHM、正常胎盘及水肿性流产胎盘绒毛细胞滋养细胞、绒毛间质细胞、绒毛间中间滋养细胞及蜕膜组织中p57KIP2均(+),而绒毛合体滋养细胞p57KIP2(-);②在CHM绒毛细胞滋养细胞和绒毛间质细胞中p57KIP2(-),与PHM中相应细胞表达情况比较差异极显著(P<0.01).结论 p57KIP2可作为CHM与PHM鉴别诊断的标记物,对CHM的诊断具有很高的灵敏度和特异度.     

MMP-26、TIMP-4和MMP-9在弥漫大B细胞淋巴瘤中的表达及意义

本研究旨在检测弥漫大B细胞淋巴瘤（diffuse large B cell lymphoma,DLBCL）中基质金属蛋白酶-26（MMP-26）、金属蛋白酶组织抑制蛋白4（TIMP-4）及基质金属蛋白酶-9（MMP-9）的表达,探讨其与DLBCL发生及进展的关系.采用免疫组织化学SABC法检测了95例DLBCL患者淋巴瘤组织中MMP-26、TIMP-4和MMP-9的表达,并分析它们与DLBCL临床病理指标的关系.结果表明,与淋巴结反应性增生（20例）相比较,不同类型的DLBCL高表达MMP-26、TIMP-4、MMP-9.MMP-26表达阳性率与免疫分型有关（P＜0.05）,生发中心型（GCB）中MMP-26的表达低于non-GCB中MMP-26表达,而与临床分期、年龄、性别、疾病部位无关（P＞0.05）;MMP-9表达阳性率与临床分期有关,Ⅲ期、Ⅳ期患者MMP-9蛋白的表达阳性率明显高于Ⅰ、Ⅱ期患者（P＜0.05）,而与免疫分型、年龄、性别、结外病变无关（P＞0.05）;TIMP-4的表达与免疫分型、临床分期、年龄、性别、结外病变均无相关性关（P＞0.05）.DLBCL病理组织中MMP-26与TIMP-4表达无相关性,与MMP-9蛋白的表达呈正相关（r=0.486,P＜0.05）.结论：MMP-26、MMP-9协同表达于DLBCL,MMP-26可能参与DLBCL的发展及侵袭性,MMP-26的表达与DLBCL病理亚型有关,MMP-26可能作为DLBCL分型的参考指标,并有助于对DLBCL恶性程度及预后的预测,其本身有可能成为一个潜在的治疗靶点.     

MMP-9和TIMP-1在不明原因不孕症患者子宫内膜的表达

目的检测基质金属蛋白酶-9（MMP-9）和组织金属蛋白酶抑制物-1（TIMP-1）在不明原因不孕症子宫内膜和正常子宫内膜中的表达,探讨两者与不明原因不孕的关系。方法应用免疫组化SP法,检测MMP-9和TIMP-1在20例不孕症患者的种植窗期子宫内膜和20例正常子宫内膜中的表达。结果MMP-9／TIMP-1在2组子宫内膜的腺上皮细胞和基质细胞的胞浆中均有不同程度的表达。MMP-9／TIMP-1在正常子宫内膜中呈高表达状态;在不孕子宫内膜表达较低,与正常子宫内膜组织相比差异有统计学意义（P〈0．05）。结论不明原因不孕症妇女子宫内膜种植窗期MMP-9和TIMP-1的低表达,可能是导致不明原因不孕症的重要因素之一。     

hCG对滋养细胞系侵袭性相关基因表达的影响

目的：揭示人类绒毛膜促性腺激素（hCG）对滋养细胞侵袭性的影响。 方法：以永生化的滋养细胞系JEG-3为研究对象，采用逆转录多聚酶链反应（RT-PCR）方法，观察了hCG对滋养细胞系侵袭性相关基因表达的影响。 结果：JEG-3细胞自身表达MMP-2，而不表达MMP-9或uPA，同时还表达这些蛋白酶的抑制因子TIMP-1、TIMP-2和PAI-1。JEG-3细胞还表达组织蛋白酶B，而未见组织蛋白酶D的表达。在与25 IU/ml hCG温育50h后，MMP-2的表达无显著变化，而TIMP-1和PAI-1的表达显著降低，同时TIMP-2的表达被诱导增加，其它基因的表达无明显变化。 结论：高浓度(25 IU/ml)的hCG可能通过改变蛋白水解酶及其抑制因子的表达而减弱滋养细胞的侵袭性。     

基质金属蛋白酶及CD15在肺癌浸润、转移中的作用

目的 探讨基质金属蛋白酶（MMP-2,MMP-9）及其抑制剂（TIMP-1,TIMP-2）和细胞粘附分子CD15在肺癌浸润和转移中的作用,是否能为临床肺癌的诊断和治疗提供一种新的,有效的手段。方法 通过免疫组化方法检测47例肺癌标本中MMP-2 MMP-9,TIMP-1,TIMP-2和CD15的表达情况。结果 腺癌中MMP-2,TIMP-1阻性表达率明显高于鳞癌（P〈0.01）,鳞癌中MMP-9的阳性表达率高于腺癌（P〈0.01）;低分化者MMP-9的阳性表达率高于高,中分化者（P〈0.05）;有淋巴结转移者MMP-2,MMP-9和CD15的阳性表达率高于无淋巴结转移者（P〈0.01）;无淋巴结转移者中TIMP-1的阳性表达率高于有淋巴结转移者。结论 肺癌组织中MMP-2,MMP-9,TIMP-1和CD15的阳性表达可能是肺癌恶性程度和预后判断的指标。     

基质金属蛋白酶家族的表达对急性单核细胞白血病细胞体外侵袭力的影响

目的 研究基质金属蛋白酶家族(TIMP-2、MT1-MMP、MMP-2)的表达对急性单核细胞白血病细胞体外侵袭力的影响.方法 以急性单核细胞白血病细胞株SHI-1细胞为研究对象,用定量PCR、Western blot法分别检测TIMP-2、MT1-MMP、MMP-2 mRNA和蛋白表达,并以NB4、K562、THP-1等人类其他白血病细胞株细胞为对照,进行比较.构建TIMP-2逆转录病毒载体,转染SHI-1细胞,G418筛选,有限稀释法挑选出单克隆S1、S2、S3细胞.RNA干扰(RNAi)法干扰SHI-1细胞TIMP-2、MT1-MMP、MMP-2表达.明胶酶谱法测定不同细胞和骨髓基质细胞(BMSC)共培养24 h后上清中MMP-2的表达,细胞侵袭实验测定SHI-1细胞侵袭人工基质膜的能力.结果 SHI-1细胞的TIMP-2、MT1-MMP、MMP-2 mRNA表达和蛋白表达均显著高于其他细胞(P＜0.05).SHI-1细胞和BMSC共培养上清中的MMP-2酶原和活化的MMP-2含量及细胞体外侵袭率均高于其他细胞(P＜0.05).单克隆S1、S2、S3细胞TIMP-2 mRNA表达水平分别是SHI-1细胞的3.0倍、2.0倍和1.5倍(P＜0.05),蛋白表达水平分别上调2.6倍、1.5倍和1.3倍(P＜0.01),体外侵袭率增加1.5～2.5倍(P＜0.05),活化的MMP-2含量增加1.5～3.0倍(P＜0.01).RNA干扰基因沉默效率为85%～98%.SHI-1细胞TIMP-2、MMP-2、MT1-MMP表达沉默后,细胞侵袭率分别下降60%～70%、50%～60%、40%～50%(P＜0.05).RNA干扰后的细胞培养上清中检测不到活化的MMP-2.结论 SHI-1细胞在mRNA水平和蛋白水平均高表达TIMP-2、MT1-MMP、MMP-2 mRNA,SHI-1细胞和BMSC共培养后这些分子的高表达促进MMP-2的活化,增强细胞的体外侵袭力.TIMP-2表达增加1.5～2.5倍对SHI-1细胞MMP-2的活化和细胞的体外侵袭力发挥的是增强作用,而不是抑制作用.

Abstract：

Objective To study the effect of matrix metalloproteinase 2 ( MMP-2), membrane type 1 MMP (MT1-MMP) and tissue inhibitor of metalloproteinase 2 (TIMP-2) expressions on the in vitro invasive capacity of acute monocytic leukemia SHI-1 cells. Methods SHI-1, NB4, K562, M937 and THP-1 human leukemia cell lines were cultured in vitro. The mRNA and protein expressions of TIMP-2, MMP-2 and MT1-MMP in different cells were detected by quantitative RT-PCR and western blot. A retroviral vector carrying human TIMP-2 cDNA was constructed and transfected into SHI-1 cells. Three subclone cells (S1, S2 and S3) were screened by G418 and selected by limiting dilution. RNA interference (RNAi) was used to knock down the expression of MMP-2, MT1-MMP and TIMP-2. Cell invasion capacity was performed through a reconstituted human basement membrane assays. Zymography was used to analyze the expression of MMP-2 in the supernatant of co-culture. Results The expressions of MMP-2, MT1-MMP and TIMP-2 in SHI-1 cells were higher than that in other leukemic cells at both mRNA and protein levels (P ＜ 0. 05 ). The amount of proMMP-2 and activated MMP-2 in the conditioned media from SHI-1 cells co-cultured with bone marrow stromal cells (BMSCs) was more than that from other cells (P ＜ 0. 05 ). The in vitro invasive capacity of SHI-1 cells were higher than that of other cells( P ＜ 0.05 ). The mRNA levels of TIMP-2 were increased by about 3 fold, 2 fold and 1.5 fold in S1, S2 and S3 cells, respectively( P ＜ 0.05 ), while the protein levels were by about 2.6 fold, 1.5 fold and 1.3 fold than that of SHI-1 cells, respectively(P ＜ 0.01 ). The invasion rates of subclone cells demonstrated a 1.5 - 2.5 fold' elevation ( P ＜ 0.05 ) and activated MMP-2 from their supernatants increased by 1.5 -2.0 fold(P＜0.01 ). The knock-down efficiency of siRNA was 85% to 98%. The down-regulation of TIMP-2, MMP-2 and MT1-MMP decreased the invasion rates of SHI-1 cells by 60% -70%, 50% - 60% and 40% - 50%, respectively ( P ＜ 0. 05 ). No activated MMP-2 in the supernatants from any knock-down cells could be found. Conclusions SHI-1 cells constitutively overexpress MMP-2,MT1-MMP and TIMP-2 at both mRNA and protein levels. After co-cultured with BMSCs the SHI-1 cells increased MMP-2 activation and cell invasion. An increase of TIMP-2 expression in SHI-1 cells reflects an activating effect on cells invasion and MMP-2 activation.     

超声诊断滋养叶疾病

超声诊断滋养叶疾病李黎，陈耀华妊娠滋养叶疾病包括水泡状胎块（葡萄胎）。侵入性水泡状胎块及绒毛膜上皮癌。前者属良性，后者为恶性而侵入性水泡状胎块为过渡型。本病是由于胎盘绒毛膜滋养叶细胞病态增生、水肿、变性所致。我院自１９６３年起至１９９４年６月底，经超...     

基质金属蛋白酶及其抑制物对葡萄胎恶变的预测价值研究

目的　探讨基质金属蛋白酶 (MMPs)及其抑制物TIMPs在葡萄胎恶变预测中的价值。方法　采用免疫组化SP法测定 39例葡萄胎 (其中 11例发生恶变 )和 17例正常相同孕周的绒毛组织中MMP 2、MMP 9、TIMP 1、TIMP 2的表达及分布。结果　正常绒毛组织、葡萄胎组织的滋养细胞胞浆中MMP 2、MMP 9、TIMP 1、TIMP 2均有表达。MMP 2、MMP 9在葡萄胎发生恶变组的表达明显强于正常绒毛组和葡萄胎未发生恶变组 ,而TIMP 1,TIMP 2在正常绒毛组和葡萄胎组之间表达无显著性差异。MMP 2 /TIMP 2、MMP 9/TIMP 1在葡萄胎恶变组织中的表达强于在正常绒毛组织的表达。结论　在葡萄胎清宫组织中进行MMP 2、MMP 9的检测 ,有望成为判断葡萄胎日后恶变的一项预测指标     

Dynamic changes of matrix metalloproteinases and their tissue inhibitors in severe sepsis

Purpose

Little is known about the dynamic changes of matrix metalloproteinases (MMPs) and their inhibitors (TIMPs) in sepsis. Our aim was therefore to investigate the time course of MMPs and their inhibitors in patients experiencing severe sepsis.

Methods

Our prospective controlled analysis included 38 patients with severe sepsis. Plasma levels of MMP-2, MMP-9, TIMP-1, and TIMP-2 were measured daily at a 5-day-long period with enzyme-linked immunosorbent assay. Seventeen healthy volunteers were invited as controls.

Results

MMP-2 showed no difference compared to controls, whereas significantly elevated MMP-9 levels were detected on admission (P < .005). Significantly elevated but declining TIMP-1 levels were measured during the whole trial (P < .002-.004). Except for the second day, TIMP-2 levels were significantly lower than controls (P < .05-.009). MMP2/TIMP-1 ratios were significantly lower in septic patients (P < .03-.006), whereas MMP-2/TIMP-2 ratios were elevated throughout our study (P < .03-.006). MMP-9/TIMP-1 ratios were significantly lower at the first 3 days (P < .05-.008). MMP-9/TIMP-2 was significantly elevated on admission (P < .006).

Conclusions

Our research is the first follow-up study dealing with MMPs, TIMPs, and their ratios in severe sepsis. Our results indicate that MMPs and TIMPs may play a crucial role in severe sepsis, especially TIMP-1, MMP-9, and possibly TIMP-2, after an extensive study.     

A correlation between knee cartilage degradation observed by arthroscopy and synovial proteinases activities

OBJECTIVE: A novel study has been carried out to characterize the amount and activity levels of metalloproteinases (i.e., MMP-1, MMP-2, MMP-3, MMP-8, MMP-9 and MMP-13) and of their inhibitors (i.e., TIMP-1 and TIMP-2) in synovial fluid from patients (n = 56) with different degrees of either chondral lesions or knee arthritis identified and classified by arthroscopy. DESIGN AND METHODS: Zymographies, Western blotting and ELISA tests have been used to correlate the disease stage, as determined by arthroscopy, and both the amount and the activation state of different MMPs and of their inhibitors. RESULTS: Analysis of data obtained demonstrates that the degree of cartilage degradation, as seen by arthroscopy, is strictly related to the activity of some synovial MMPs, in particular MMP-2 and MMP-13 and on reduced inhibitory effect of MMP-2 by TIMP-2; in addition, a serine protease weighing about 125 kDa appears only in patients with severe cartilage degradation, i.e., with knee arthritis. CONCLUSIONS: On the whole, this is the first study in which an analysis of synovial MMPs/other proteinases activity and TIMPs has been strictly related to arthroscopy results in patients with different degrees of osteoarthritis. Results indicate that an imbalance between specific MMP activities and the amount of TIMPs and of its inhibitory efficiency is crucial for the disease evolution and it is related to the disease stage.     

血清基质金属蛋白酶及其组织抑制物的变化及临床意义

目的探讨原发性高血压（EH）患者血清基质金属蛋白酶（MMPs）及其组织抑制物（TIMPs）检测的变化及临床意义。方法采用酶联免疫吸附试验法分别测定90例未经治疗的EH患者（EH组）和60例健康体检者（对照组）血清MMP-9和TIMP-1水平。经6个月降压治疗后，检测EH患者的血清MMP-9和TIMP-1水平，并与治疗前进行对比分析。结果治疗前EH组的血清MMP-9和TIMP-1水平明显低于对照组，差异有统计学意义（P〈0、01，t=8、484、8、483）。EH组患者MMP-9与TIMP-1呈显著正相关（r=0．585，P〈0、01），但其水平与收缩压和舒张压无相关性（P〉0．05）。与治疗前相比，EH组治疗后的血清MMP-9和TIMP-1水平明显增高，差异有统计学意义（P〈0．01，t=16．597、26．298）。结论EH患者MMP-9和TIMP-1降低可能反映了EH患者细胞外基质代谢异常，可将其作为EH相关血管活性异常的间接标志物。     

Immunohistochemical expression of matrix metalloproteinases 1 and 2 (MMP-1 and MMP-2) and tissue inhibitor of metalloproteinase 2 (TIMP-2) in ruptured and non-ruptured tubal ectopic pregnancies

OBJECTIVE: Recent evidence suggests that matrix metalloproteinases (MMPs) and their inhibitors (TIMPs) are crucial for trophoblast implantation in normal pregnancy. To evaluate the expression of MMP-1, MMP2, and the tissue inhibitor of MMP-2 (TIMP-2) along the invasive pathway of trophoblast in ruptured and non-ruptured tubal ectopic pregnancies, we performed a retrospective immunohistochemical study. METHODS: In 15 tissue specimens of patients with ruptured (N = 7) and non-ruptured (N = 8) first trimester tubal ectopic pregnancies who underwent laparoscopic salpingectomy, immunohistochemical staining against MMP-1, MMP-2, and TIMP-2 was performed. Serial paraffin sections were photographed and digitized for a computerized quantitative image analysis. Mean percentages of positive stained areas by MMP-1, MMP-2, and TIMP-2 antibodies in the extravillous trophoblast were determined for ruptured and non-ruptured tubal ectopic pregnancies and compared. RESULTS: In our 15 tissue specimens of ectopic pregnancies MMP-1 and TIMP-2 were found to be more prominent in the immunohistochemical distribution pattern than MMP-2. However, no statistically significant difference could be detected between the mean percentages of positive stained area by MMP-1, MMP-2, and TIMP-2 antibodies in ruptured and non-ruptured tubal pregnancies. DISCUSSION: For the first time, we measured the comparative immunohistochemical expression of MMP-1, MMP-2, and TIMP-2 in ruptured and non-ruptured tubal ectopic pregnancies. Although our results did not show any statistically significant difference between ruptured and non-ruptured tubal ectopic pregnancies, we conclude that MMP-1, MMP-2, and TIMP-2 are functionally involved in the highly proliferative early first part of ectopic implantation.     

Expression and response to angiotensin-converting enzyme inhibition of matrix metalloproteinases 2 and 9 in renal glomerular damage in young transgenic rats with renin-dependent hypertension

Extracellular matrix expansion in the glomerular mesangium contributes to the development of glomerulosclerosis and chronic renal disease in arterial hypertension. Transforming growth factor-beta1 (TGF-beta1), matrix metalloproteinases (MMPs), and tissue inhibitors of MMPs (TIMPs) are involved in this process. Conflicting data are reported on the effects of angiotensin II (Ang II) and the response to angiotensin-converting enzyme inhibition on MMPs and TIMPs in early stages of hypertensive glomerular damage. We therefore investigated the effects of Ang II-dependent hypertension on MMP-2, MMP-9, TIMP-1, and TIMP-2 in isolated glomeruli of 8-week-old homozygous male rats overexpressing the mouse Ren2 gene [TGR(mRen2)27]. At this age, systolic blood pressure was already significantly elevated in Ren2 compared with Sprague-Dawley (SD) rats (197 +/- 38 versus 125 +/- 16 mm Hg, p < 0.01). Ren2 exhibited renal damage as determined by increased urinary albumin excretion, focal glomerulosclerosis, mesangial matrix expansion, and alpha-smooth muscle actin deposition. Quantification of mRNA levels in isolated glomeruli by real-time polymerase chain reaction showed a significant increase of TGF-beta1, a 2.3- and a 2.6-fold increase of MMP-2 and TIMP-1 in Ren2 compared with SD (p < 0.01, respectively) and no strain differences for TIMP-2. In contrast, MMP-9 mRNA expression was markedly suppressed to 10% of control levels in Ren2 (p < 0.01). Early treatment with ramipril completely prevented renal damage in Ren2 and restored mRNA expression of TGF-beta1, MMP-2, and TIMP-1 to SD control levels. Interestingly, down-regulation of MMP-9 mRNA, protein, and activity was not affected by ramipril, indicating that the protective effect of this compound is not attributable to restoration of MMP-9 in the glomerulus.     

Myocardial fibrosis in transforming growth factor-beta(1) (TGF-beta(1)) transgenic mice is associated with inhibition of interstitial collagenase

BACKGROUND: TGF-beta(1) mediates effects on fibroblast proliferation and collagen synthesis in the myocardium. The extracellular matrix remodeling depends on the fibrillar collagen degrading matrix metalloproteinases (MMPs) and their inhibitors (TIMPs). The in vivo effects of TGF-beta(1) on the MMP/TIMP system in TGF-beta(1) overexpressing transgenic mice were studied. METHODS: Male Alb/TGF-beta(1)(cys(223,225)ser) transgenic mice (TG) and nontransgenic controls (C; 8 weeks) were examined. Protein expression of collagen type I, -III, interstitial collagenase (Int Coll), MMP-2, -9, TIMP-1, -2, -4 and TGF-beta(1) as well as enzyme activity (MMP-2, -9) were measured (Western blots, zymographic assays). mRNA expression of the interstitial collagenase and MMP-9 was studied with the Light-Cycler based real-time PCR. RESULTS: Overexpression of TGF-beta(1) resulted in a 10-fold increase in plasma and a seven-fold increase in myocardial TGF-beta(1) concentrations. Relative heart weights increased (mg g(-1): 7.8 +/- 0.4 vs. 4.8 +/- 0.6, n = 6; P < 0.01) in TG compared to C. Collagen type I and III increased in TG (1.9-fold and 1.7-fold) compared to controls. Interstitial collagenase protein activity (- 91%) and mRNA expression (-75%) in TG were reduced (P < 0.05-P < 0.001). Gelatinase (MMP-2, MMP-9) expression and activity were not significantly alterated. MMP-inhibitors were increased 2.5-fold (TIMP-1, -4) and 6-fold (TIMP-2) in TG. CONCLUSIONS: TGF-beta(1) produces myocardial fibrosis in vivo. This effect is not only produced by a stimulation of matrix protein formation: a complex regulation of MMP and TIMP interaction, namely decrease of expression and activity of interstitial collagenase and an enhanced inhibition by increased levels of TIMPs, are involved. These mechanisms are optional targets for therapeutic interventions in myocardial diseases.     

螺内酯对肝星状细胞表达基质金属蛋白酶及其抑制剂的影响

目的研究螺内酯干预肝星状细胞（HSCs）后基质金属蛋白酶2（MMP-2）、MMP-9、MMP-13和其组织抑制剂1（TIMP-1）的变化。探讨螺内酯对胶原代谢影响的机制。方法应用不同浓度螺内酯（1×10^-4）mol／L-（1×10^-7）mol／L干预HSCs 48小时,采用反转录-聚合酶链反应（RT-PCR）方法检测MMP-2、MMP-9、MMP-13 mRNA和TIMP-1 mRNA的表达。结果①螺内酯组的MMP-13基因表达强度上调,螺内酯（1×10^-4）mol／L-（1×10^-5）mol／L浓度组MMP-13基因表达强度（0．91±0．13、0．80±0．01、0．67±0．15）均明显高于对照组（0．53±0．10）（P〈0．01）。1×10^-4mol／L浓度组MMP-13基因表达强度接近对照组的2倍。②螺内酯干预HSCs48小时后,TIMP-1基因表达减少,螺内酯（1×10^-4）mol／L-（1×10^-6）mol／L浓度组（0．15±0．05、0．28±0．15、0．37±0．03）明显低于对照组（0．47±0．04）（P〈0．01或〈0．05）。③螺内酯不同浓度干预HSCs 48小时后,HSCs MMP-2、MMP-9基因表达无明显变化（P〉0．05）。结论螺内酯可抑制HSCs TIMP-1基因的表达,增加间质胶原酶MMP-13 mRNA的含量。螺内酯可能通过对MMPs及TIMP-1影响而促进胶原降解。