脱氢抗坏血酸对高糖诱导系膜细胞产生氧自由基的影响

目的 探讨脱氢抗坏血酸(DHA)对高糖诱导系膜细胞产生氧自由基(ROS)的影响。 方法 (1)原代培养大鼠系膜细胞；(2)以Fe3+还原法检测细胞内抗坏血酸(AA)和DHA浓度，观察系膜细胞摄取AA和DHA的情况及葡萄糖、葡萄糖转运蛋白(GLUT)抑制剂细胞松弛素B对其的影响；(3)采用激光扫描共聚焦显微镜检测细胞内ROS，观察高糖诱导系膜细胞ROS产生的情况及不同浓度DHA对其的影响；(4)采用凝胶电泳迁移率法(EMSA)检测活性蛋白1(AP-1)和DNA的结合活性，观察DHA对高糖诱导的系膜细胞内AP-1 活性的影响。结果 (1)AA不能由细胞外进入系膜细胞，而DHA可以进入，并且随着细胞外葡萄糖浓度的增加，其进入速度减慢；细胞松弛素B则完全抑制了DHA进入到系膜细胞。(2)高糖快速诱导系膜细胞ROS产生增多；DHA抑制了高糖的这种作用，并且该抑制作用在≤4 mmol/L的浓度范围内呈浓度依赖性。(3)DHA抑制了高糖诱导的系膜细胞内AP-1 的激活。 结论 (1)系膜细胞是依赖DHA利用Vit C的细胞型；DHA进入该细胞依赖GLUT介导，高糖可抑制其进入细胞。(2)DHA可有效抑制高糖诱导的系膜细胞ROS产生增多，并在一定范围内呈浓度依赖性。(3)DHA在抑制ROS产生的同时，也显著抑制了高糖诱导的AP-1 的激活。     

褪黑素对高糖条件下培养的大鼠系膜细胞增殖、凋亡和细胞周期的影响

糖尿病肾病（DN）晚期肾脏细胞凋亡与肾功能恶化程度成正比，抑制凋亡则可延缓肾小球硬化。褪黑素（MT）是松果体分泌的神经内分泌激素，肾脏是其靶器官之一。研究显示MT对DN肾脏有明显的保护作用，但MT对DN晚期肾小球系膜细胞（MC）凋亡的影响尚未检索到有关报道。本试验选用大鼠MC为研究对象，来观察MT对高糖诱导的MC凋亡的影响。     

Cl-/base exchange in rat mesangial cells: regulation of intracellular pH

The present study was designed to determine whether rat glomerular mesangial cells possess Cl- -dependent intracellular pH (pHi) regulatory processes. Rat glomerular mesangial cells were grown to confluence on glass coverslips. Intracellular pH (pHi) was measured with BCECF. Steady state pHi in HCO3- containing solutions was 7.08 +/- 0.03 (N = 13). When extracellular Cl- was acutely removed, pHi increased at a rate of 0.57 +/- 0.03 pH/min units (N = 8), P less than 0.001. DIDS (0.5 mM) significantly decreased the rate of increase in pHi to 0.34 +/- 0.04 pH/min, P less than 0.01. Na+ removal and amiloride (1 mM) did not alter the increase in pHi induced by Cl- removal. Steady state pHi in the absence of Cl- was significantly increased above control, 7.39 +/- 0.02 (N = 7), P less than 0.001. Following the acute alkalinization of pHi by CO2 removal, pHi recovered at a rate of 0.07 +/- 0.01 pH/min (N = 9). In the absence of Cl-, the pHi recovery rate was significantly decreased to 0.01 +/- 0.008 pH/min (N = 5), P less than 0.01. DIDS (0.5 mM) significantly decreased the rate of pHi recovery to 0.02 +/- 0.01 pH/min (N = 5), P less than 0.01. Na+ removal and amiloride (1 mM) had no effect on the rate of pHi recovery following acute alkaline loading.(ABSTRACT TRUNCATED AT 250 WORDS)     

Transient high glucose induces persistent inflammatory status in rat glomerular mesangial cell via histone methylation modification

Objective To investigate whether the effect of transient high glucose on inflammatory factors expression could be continuous in rat glomerular mesangial cell, and its relation with histone methylation modification. Methods Rat glomerular mesangial cells (HBZY-1) were divided into three groups: the high glucose group (25.0 mmol/L glucose), the hypertonic group (MA, 5.5 mmol/L glucose+19.5 mmol/L mannitol) and the normal-glucose control group (5.5 mmol/L glucose), which were cultured for 24 h respectively. All 3 groups were then changed with normal-glucose medium to culture for 24 h, 48 h and 72 h. Their protein, mRNA and supernatant were harvested. The protein expressions of mono-methylation of H3 lysine 4 (H3K4me1) was measured by Western blotting, and the mRNA expressions of NF-κB subunit p65 and set7/9 were determined by real time-quantitative PCR. The expression of monocyte chemoattractant protein 1 (MCP-1) and vascular cell adhesion molecule 1 (VCAM-1) were detected by enzyme-linked immunosorbent assay. Results (1) Compared with those in normal control group, the expressions of H3K4me1 protein and set7/9 mRNA were first up-regulated in high glucose group, then gradually down-regulated in the following 48 h normal-glucose medium (as compared with those at 0 h, all P＜0.05). At 72 h there was no statistic difference between high glucose group and normal control group (all P＞0.05). (2) Compared with those in normal control group, the up-regulated p65 mRNA, VCAM-1 and MCP-1 sustained at least for 72 h in high glucose group. Conclusions Transient high glucose can induce persistent inflammatory factors expression in rat glomerular mesangial cells, which may via histone modification.     

Effect of high glucose on mesangial cell protein kinase C-delta and -epsilon is polyol pathway-dependent.

In diabetes mellitus, enhanced activity of mesangial cell protein kinase C (PKC) may contribute to nephropathy. The purpose of this study was to determine whether high glucose alters mesangial cell diacylglycerol-sensitive PKC-alpha, -beta2, -delta, and -epsilon content, cellular distribution, and activity through polyol pathway activation. Primary cultured rat mesangial cells (passage 10) were growth-arrested in 0.5% fetal bovine serum and cultured in 5.6 mM glucose (NG) or 30 mM glucose (HG) for 48 h, with or without the aldose reductase inhibitor tolrestat or ARI-509. PKC isoform content in total cell lysates, or cytosol, membrane (Triton X-soluble), and particulate (sodium dodecyl sulfate-soluble) fractions was analyzed by immunoblotting, and band density in HG was expressed as a percentage of corresponding NG values. In HG at 48 h, increased total PKC-alpha (222 +/- 17% of NG, P < 0.001), -beta2 (209 +/- 12%, P < 0.001), and -epsilon (195 +/- 19%, P < 0.001) were observed. L-Glucose had no effect on total PKC isoform content. HG caused increased membrane- and particulate-associated PKC-alpha (257 +/- 87 and 327 +/- 66%, respectively, P < 0.05), membrane-associated PKC-delta (143 +/- 10%, P < 0.05), and membrane-associated PKC-epsilon (186 +/- 11%, P < 0.001), with no change in cytosol contents. The HG effects were not mimicked by L-glucose. In NG or HG, PKC-beta2 was not detected in the cytosol fraction, and membrane and particulate association were unchanged with phorbol ester stimulation. Confocal immunofluorescence imaging revealed that in HG, PKC-alpha, -delta, and -epsilon translocate to the nucleus and plasma membrane. Total PKC activity measured by in situ 32P-phosphorylation of the epidermal growth factor receptor substrate increased from 18 +/- 1 pmol/min per mg cell protein in NG to 33 +/- 3 pmol/min per mg cell protein in HG (P < 0.002 versus NG). In NG, tolrestat and ARI-509 exposure caused increased PKC activity, enhanced accumulation of total PKC-alpha and -beta2, with no change in total or fractional recovery of PKC-delta or -epsilon. In HG, tolrestat and ARI-509 prevented the increase in total PKC-epsilon and membrane-associated PKC-delta and -epsilon. It is concluded that within 48 h of HG, enhanced mesangial cell PKC activity is associated with accumulation and cellular redistribution of diacylglycerol-sensitive PKC isoforms, and that increased PKC-epsilon content and membrane-associated PKC-delta and -epsilon are dependent on polyol pathway activation.     

高糖对大鼠系膜细胞肝细胞生长因子受体表达的影响及其机制研究

目的 观察高糖作用下大鼠系膜细胞(MsC)肝细胞生长因子（HGF）受体c-Met的表达，并探讨其机制和意义。 方法 用RT-PCR和Western 印迹方法检测高糖作用大鼠MsC的不同时间点（0、12、24、48、96 h）c-Met的表达。分别用光辉霉素A（mithramycin A）和SU11274抑制转录因子Sp1的DNA结合活性和阻断c-Met。用电泳迁移率改变实验(EMSA)观察Sp1与c-Met基因启动子的结合活性。以荧光探剂二氯双氢荧光素二乙酸酯(DCFH-DA)捕获细胞内活性氧。 结果 大鼠MsC的c-Met表达在高糖作用12、24和48 h都明显上升，96 h开始下降。光辉霉素A呈浓度依赖性抑制高糖作用下大鼠MsC的c-Met表达上调。大鼠MsC内Sp1与c-Met基因启动子的结合活性在高糖作用下明显增强。HGF及c-Met显著抑制高糖诱导的大鼠MsC内活性氧的增多。 结论 高糖作用下大鼠MsC的c-Met表达增强，其机制可能是通过Sp1介导。HGF-c-Met信号通路激活能抑制高糖所致大鼠MsC内的氧化应激反应。     

霉酚酸酯对高糖所致大鼠肾小球系膜细胞增殖的影响

霉酚酸酯（MMF）是一种新型的免疫抑制剂。本研究旨在探讨MMF对不同浓度葡萄糖所致的系膜细胞增殖及细胞外基质增多是否有抑制作用。     

褪黑素抑制高糖诱导的大鼠肾小球系膜细胞凋亡

目的探讨褪黑素（MT）对于高糖诱导的肾小球系膜细胞（MC）凋亡中的作用及机制。方法光学显微镜观察大鼠MC凋亡的形态学变化;流式AnnexinV／PI双染法检测不同浓度MT对大鼠MC细胞凋亡率的影响;免疫细胞化学检测细胞色素C的表达改变。结果MT对30mmol／L葡萄糖诱导的MC高凋亡率有明显的抑制作用,呈剂量依赖性关系;并能明显抑制细胞色素C的表达。结论MT可抑制高糖诱导的大鼠MC高凋亡率,这种作用部分通过调控细胞色素C来实现的。     

Effect of elevated glucose on endothelin-induced store-operated and non-store-operated calcium influx in renal mesangial cells

Early diabetic nephropathy exhibits renal glomerular hyperfiltration and an increase in renal plasma flow. The hyperfiltration is a dysfunctional state that may arise from a hyperglycemic-induced hypocontractility of glomerular mesangial cells that may be associated with depressed Ca(2+) signaling events. The present study was designed to determine the effects of acute (minutes) and chronic (days) elevated glucose levels on endothelin-induced calcium signaling with a particular emphasis on the potential influence on stores and store-operated Ca(2+) influx (SOCI; also called capacitative calcium entry) in glomerular mesangial cells. Primary cultures of rat mesangial cells were grown in either high (30 mM) or normal (5 mM) glucose-containing media and tested in the presence of either high (30 mM) or normal (5 mM) glucose levels. Intracellular calcium levels were monitored with the calcium-sensitive fluorophore fura-2 before and after treatment with either endothelin-1 (10 nM), to induce typical Ca(2+) signals, or the endoplasmic reticulum (ER) Ca-ATPase inhibitor thapsagargin (1 microM), to unload ER Ca(2+) stores. Both acute and chronic exposure to high glucose levels depressed the endothelin-induced calcium signal. However, neither release of Ca(2+) from stores nor SOCI were depressed by high glucose levels. In contrast, an endothelin-induced calcium entry pathway (likely receptor-operated calcium influx), separate from SOCI, was markedly depressed in the presence of both acute and chronic high glucose levels. The depressant effect of high glucose was rapidly (minutes) reversible upon returning to normal glucose levels. It is concluded that high glucose levels depress endothelin-induced calcium signaling in rat mesangial cells by inhibiting non-SOCI Ca(2+) entry pathways, namely the receptor-operated Ca(2+) influx pathway. The glucose-induced alterations in the receptor-operated calcium influx pathway may, in part, contribute to the depressed contractile state of glomerular cells during periods of hyperglycemia.     

磷脂酶D对高糖培养的肾小球系膜细胞骨架的影响

目的 研究高糖环境下肾小球系膜细胞（GMC）内磷脂酶D（PLD）的活性改变及其对细胞骨架的影响。方法 对高糖（30mmol/L)刺激48h的大鼠GMC，用酶联比色法测定磷脂酰胆碱专一性磷脂酶D（PC-PLD）活性，底物磷酸化法检测蛋白激酶C（PKC）的活性。用免疫荧光标记和共聚焦显微镜显示并测量F-actin的表达。结果 高糖刺激48h后，GMC内PC-PLD和PKC活性明显增高，而F-actin荧光表达减少，排列紊乱，给予PC-PLD抑制剂后，高糖培养的GMCPKC活性明显下降。F-actin的荧光表达和排列都得到显著改善。结论 高糖时PLD活性增高可以通过PKC途径影响GMC骨架的组装状态。改变系膜细胞收缩功能。     

Antioxidants modulate adenosine metabolism in rat mesangial cells cultured under high glucose conditions

Glomerular mesangial cells play a major role in glomerular hemodynamics, considered also as antigen-presenting cells participating in immune response. Mesangial dysfunction and proliferation are typical lesions of diabetic glomerulopathy. Adenosine, a local hormone, produced by mesangial cells is a metabolic regulator of renal blood flow, capable of decreasing glomerular filtration rate (GFR), exerting immunosuppressive, antiproliferative and anti-inflammatory properties. Since it was well established that antioxidants confer protection against increased oxidative stress that occurs in diabetes, the effect of captopril, reduced glutathione and melatonin on adenosine metabolism was investigated. Glomerular mesangial cells obtained from collagenase treated glomeruli, isolated from renal cortex of Sprague-Dowley rats, were grown under high glucose conditions (30 mmol/L) as a model of diabetic microenvironment. The activity of adenosine metabolizing enzymes: 5'-nucleotidease (5'-NU) responsible for its production and adenosine deaminase (ADA) responsible for its degradation were investigated. Hyperglycemic conditions led to decreased adenosine production via 5'-NU and decreased removal via ADA. Captopril, given in therapeutic concentration induced enzyme activities in normoglycemic conditions and restored hyperglycemia-induced decrease. In order to investigate if the presence of SH groups may be responsible for this improvement, the cells were exposed to reduced glutathione, and it exerted almost equal effect, given in physiological and higher concentrations. Melatonin increased 5'-NU activity only in physiological glucose conditions. Presented results confirm potential renoprotective effect of SH-group containing antioxidant supplementation during diabetes in restoring adenosine metabolism.     

蛋白激酶C激活在高糖诱导肾系膜细胞中的作用

目的：探讨高糖对系膜细胞蛋白激酶C（PKC）活性的影响及PKC在系膜细胞增殖、细胞外基质积聚中的作用。方法：采用大鼠系膜细胞进行体外培养,高糖作为激动剂,佛波酯（PMA）作为PKC抑制剂,甘露醇作为渗透压对照,用液闪仪测定PKC活性,^3H-TdR渗入法检测细胞增殖,ELISA法测定培养上清中纤维连接蛋白（FN）含量。结果：高糖可增加系膜细胞颗粒部分PKC活性、抑制细胞增殖、促进FN分泌,且与渗透压无关。抑制PKC后,可阻止高糖诱导的FN分泌。结论：高糖可激活系膜细胞PKC,促进细胞外基质积聚和糖尿病肾症的发生。     

Growth inhibition of rat mesangial cells by high glucose: effect of vitamin E

Background. We aimed to examine both whether vitamin E prevented and whether it reversed the growth inhibitory effect of high glucose. Methods. For the preventive experiment, rat mesangial cells (RMC) were grown in control glucose medium with the addition of 100 μM of vitamin E. High glucose (27.5 mM) was added to the medium concurrent with the vitamin E addition. The 3-(4,5-di-methylthiazol-2-yl)-2,5 diphenyltetrazolium bromide (MTT) assay was used to measure RMC proliferation. Our data confirmed the growth inhibitory effect of high glucose and showed that the growth inhibition was prevented by vitamin E. To examine whether vitamin E reversed the growth inhibitory effects of high glucose, RMC were grown in control and high glucose medium. Contrary to previous prevention type studies, vitamin E was not added to the medium until growth inhibition of the RMC by the high glucose was established. Results. Our data show that it took 5 days of vitamin E administration to reverse the growth inhibitory effect of high glucose. Conclusion. This is the first time that vitamin E has been shown to reverse this high-glucose-induced inhibition of RMC, suggesting that vitamin E reverses a potentially important pathogenetic process. Received: January 6, 1999 / Accepted: May 20, 1999     

罗格列酮对高糖刺激的大鼠系膜细胞β1整合素和cyclinD1表达的影响

目的观察过氧化物酶体增殖物激活受体(PPAR)γ激动剂噻唑烷二酮类化合物(罗格列酮)对高糖刺激大鼠肾小球系膜细胞(GMC)β1整合素和细胞周期正调控蛋白cyclinD1表达的影响,为早期糖尿病肾病(DN)防治寻求新的理论依据.方法体外培养大鼠HBZY-1 GMC,分为6组正常糖组、高糖组、甘露醇组、高糖分别加1、5、10 μmol/L罗格列酮组.干预作用24 h后采用间接免疫荧光染色及流式细胞仪检测β1整合素表达,细胞免疫组化染色检测cyclinD1表达,四唑盐比色(MTT法)测定细胞增殖.结果高糖刺激使GMC的β1整合素、cyclinD1表达增加,细胞增殖能力增强,且不依赖于渗透浓度.罗格列酮可抑制高糖刺激GMC的β1整合素、cyclinD1表达,使细胞增殖能力降低,且呈剂量依赖性.相关分析表明β1整合素与cyclinD1、β1整合素与细胞增殖、cyclinD1与细胞增殖间均呈正相关.结论黏附分子参与了DN发病机制,PPAR-γ可能通过参与调节黏附机制及其介导的细胞周期调控而影响DN早期GMC增殖和系膜扩张.     

缬沙坦对高糖上调系膜细胞细胞外调节蛋白激酶表达的影响

目的观察在高糖刺激下，系膜细胞细胞外调节蛋白激酶（ERKI／2）的活性变化以及缬沙坦对其影响，探讨缬沙坦保护肾脏作用的可能机制。方法原代培养大鼠肾脏系膜细胞，随机分为4组：低糖组（NG，d-葡萄糖5．5mmol／L）、高糖组（HG，d-葡萄糖30mmol／L）、甘露醇组（MG，d-葡萄糖5．5mmol／L＋甘露醇24．5mmol／L）和缬沙坦组（HG＋Val，d-葡萄糖30mmol／L＋缬沙坦10μmol／L）。用免疫细胞化学法及Western印迹法对系膜细胞中磷酸化ERK1／2（p-ERK1／2）的表达进行定位及半定量分析；RT—PCR法检测细胞中TGF-β1 mRNA的表达；放射免疫法测定各组细胞上清中Ⅳ型胶原的含量。结果高糖组系膜细胞中P-ERK1／2蛋白的表达较低糖组明显增高，并由胞质向胞核内转移，呈时间依赖方式（P〈0．01）；TGF-β1 mRNA及细胞上清液中Ⅳ型胶原水平均高于低糖组（P〈0．01）。而缬沙坦组上述指标均较同时相点高糖组显著降低，差异有统计学意义（P〈0．01）。甘露醇组与低糖组各指标间差异均无统计学意义。结论高糖可显著激活系膜细胞ERK信号通路，缬沙坦可抑制高糖的激活作用。     

Retinoic acid regulation of mesangial cell apoptosis

Retinoic acid (RA) is recently used for the treatment of experimental glomerular diseases. However, mechanisms underlying its therapeutic effects are largely unknown. We recently reported that RA has the potential for protecting certain cells from particular injury. A typical example is its effect on oxidant-induced apoptosis of mesangial cells. Mesangial cells exposed to hydrogen peroxide undergo apoptosis through activation of the c-Jun N-terminal kinase activator protein 1 pathway. RA dramatically inhibits this process via suppression of c-fos/c-jun expression and inhibition of the c-Jun N-terminal kinase activation. The anti-apoptotic effect of RA is mediated by both nuclear receptor dependent and nuclear receptor independent mechanisms and is, at least in part, mediated by induction of mitogen-activated protein kinase phosphatase 1. In this review, we briefly summarize the current knowledge on molecular mechanisms involved in the anti-apoptotic effects of RA.     

高糖对大鼠肾系膜细胞泛素及泛素化蛋白表达的影响

目的 探讨高糖对大鼠肾系膜细胞泛素及泛素化蛋白表达的影响。 方法 将大鼠HBZY-1肾系膜细胞进行体外培养,高糖作为刺激因子,分别设正常对照组(5.6 mmol/L葡萄糖)、高糖组（10、20、30 mmol/L葡萄糖）、甘露醇组。刺激12、24、48 h后,分别用实时定量PCR法和Western印迹法检测各组系膜细胞泛素mRNA和泛素化蛋白的表达。 结果 泛素化蛋白多以大分子蛋白为主。与正常对照组比较,30 mmol/L葡萄糖刺激24 h和48 h后泛素化蛋白的表达分别增加36％和52％（均P ＜ 0.01）;20 mmol/L和30 mmol/L葡萄糖作用48 h泛素化蛋白的表达分别增加31％和52％（均P ＜ 0.01）;高糖作用24、48 h,泛素mRNA的表达显著增加（均P ＜ 0.05）。 结论 高糖呈时间浓度依赖性地促进大鼠肾系膜细胞泛素mRNA及泛素化蛋白的表达,增加泛素蛋白酶体途径活性。     

高糖对肾小球系膜细胞间通讯功能的影响

目的研究高糖对肾小球系膜细胞间隙连接蛋白（connexin 43）表达和细胞间通讯功能的影响。方法分离培养大鼠肾小球系膜细胞，调整培养液葡萄糖浓度为以下3组：正常葡萄糖组（5．5mmol／L葡萄糖）、高糖组（30mmol／L葡萄糖）和渗透压对照组（5．5mmol／L葡萄糖加24．5mmol／L甘露醇），于37℃5％CO2条件下培养24、48h后．利用激光共聚焦显微镜和荧光漂白恢复（FRAP）技术检测细胞间通讯功能，并应用Northern印迹和细胞免疫化学、Western印迹方法检测connexin 43 mRNA和蛋白质表达，比较3组之间的差异。结果正常葡萄糖浓度培养下系膜细胞表达丰富的connexin 43，细胞间通讯功能良好。高糖培养的系膜细胞细胞间通讯功能下降，荧光淬灭后的恢复比例和速度显著低于正常糖组（P〈0．05）。同时高糖环境下培养的系膜细胞connexin 43 mRNA和蛋白质表达均较正常糖组显著下降（P〈0．05）。渗透压对照组与正常糖组之间差异无统计学意义（P〉0．05）。结论高糖可抑制connexin 43的基因和蛋白质表达及细胞间通讯功能，可能是糖尿病肾病系膜细胞表型和功能异常的重要原因之一。     

金属蛋白酶组织抑制剂1抑制高糖诱导的大鼠肾小球系膜细胞凋亡

目的 探讨金属蛋白酶组织抑制剂1(TIMP-1)在高糖诱导的肾小球系膜细胞(MC)凋亡中的作用及机制。方法 用流式AnnexinV/PI双染法及吖啶橙染色检测大鼠MC经不同浓度葡萄糖作用后的凋亡率。用脂质体法将正义、反义人TIMP(hTIMP)-1转染到MC中。采用PCR及RT-PCR检测hTIMP-1的整合及大鼠内源性TIMP-1(rTIMP-1)、bax和bcl-2表达。用CaspACETM Assay System检测半胱氨酸天胱氨酸蛋白酶(caspase-3)的蛋白活性。结果 高糖以剂量及时间依赖的方式诱导凋亡,相关系数r分别为0.925、0.9867, P均 < 0.01。在葡萄糖浓度为30 mmol/L培养条件下, hTIMP-1正义转染组的MC 24 h凋亡率为(4.30±1.11)%, 48 h为(7.78±0.92)%, 与正常对照组[24 h(14.95±1.60)%, 48 h(43.03±4.20)%]及空载体组[24 h(16.50±0.83)%,48 h(40.82±2.46)%]相比, 细胞凋亡显著减少(P < 0.01);hTIMP-1反义转染组MC 24 h凋亡率为(22.5±1.60)%, 48 h为(53.68±3.40)%,与正常对照组和空载体组相比,细胞凋亡显著增加(P < 0.01)。高糖作用后, 正义TIMP-1下调MC bax mRNA的表达, 反义hTIMP-1使之表达上调。与对照组(A值0.1407±0.007)相比, 正义hTIMP-1组caspse-3活性(A值0.086±0.009)显著降低,(P < 0.01),反义hTIMP-1组caspase-3活性(A值0.186±0.02)显著增高,(P < 0.01)。TIMP-1转染不影响bcl-2 mRNA水平的表达。结论 TIMP-1能够抑制高糖诱导的MC凋亡,这种作用部分是通过bax及caspase-3途径来实现的。