Effect of fluoroquinolones on the expression of matrix metalloproteinase in debrided cornea of rats

Matrix metalloproteinases (MMPs) are implicated in regenerative and healing processes in corneal injuries. Based upon reports that topical fluoroquinolones (FQs) may cause perforations during corneal healing by modulating MMPs, this study evaluated the comparative effects of commercially available FQs eye drops on the expression of MMP-2 and MMP-9 in the cornea after ethanol injury. Uniform corneal epithelial defects were created using 70% ethanol in the right eye of the rats (n = 6). The groups studied were (I) sham, (II) normal saline with benzalkonium chloride (NS-BKC), (III) norfloxacin 0.3%, (IV) ciprofloxacin 0.3%, (V) lomefloxacin 0.3%, (VI) sparfloxacin 0.3%, (VII) gatifloxacin 0.3%, and (VIII) moxifloxacin 0.5%. Each treatment was instilled six times/day up to 48 h and rats were sacrificed using excess of anesthesia. The corneas were excised to study the expression of MMP-2 and MMP-9 using gelatin zymography and real-time PCR. All the FQs significantly increased the expression of MMP-2 and MMP-9 as compared to the sham and NS-BKC-treated group. NS-BKC did not show a significant effect on MMPs expression compared to the sham group. Among the studied FQs, ciprofloxacin was observed to exhibit maximal induction of MMP-2 and MMP-9, whereas lomefloxacin exhibited an equivocal effect on both MMP-2 and MMP-9 expression. Findings of the present study demonstrate that topical application of FQs may induce the expression of MMP-2 and MMP-9 in debrided corneal epithelium and, therefore, may delay corneal wound healing. Thus, it can be concluded that selecting a FQ for ophthalmic use having minimal effect on MMPs may impact wound healing in injured or vulnerable cornea.     

柔肝化纤颗粒对四氯化碳诱导的肝纤维化大鼠基质金属蛋白酶1及其抑制因子的影响

目的 探讨柔肝化纤颗粒对四氯化碳诱导的肝纤维化大鼠基质金属蛋白酶1（MMP-1）和金属蛋白酶组织抑制因子1（TIMP-1）的影响.方法 建立四氯化碳诱导的肝纤维化大鼠模型,健康清洁SPF级大鼠85只,雌雄各半,随机数字表法分为正常对照组（15只）、病理模型组（16只）、柔肝化纤颗粒组（16只）、大黄座虫丸组（16只）及秋水仙碱对照组（16只）.正常对照组不做其他处理,常规饲养;肝纤维化造模成功后,正常对照组、病理模型组4周后灌胃0.9％氯化钠注射液,柔肝化纤颗粒组、大黄廑虫丸组、秋水仙碱对照组造模成功4周后分别给予柔肝化纤颗粒、大黄=虫丸（0.2 g/kg）、秋水仙碱（100 μg/kg）灌胃,各组灌胃液体量为10 ml/kg体重,每日1次.各组于用药治疗后5、10周,免疫组织化学染色及计算机图像分析技术检测Ⅳ胶原.利用半定量反转录-聚合酶链反应检测MMP-1和TIMP-1 mRNA的表达.结果 用药治疗后5、10周,病理模型组肝组织炎症活动度计分、肝纤维化程度计分均明显高于正常对照组[用药后5周：（4.93±2.56）分比（1.08 ±0.29）分,（15.57±6.12）分比0分,用药后10周：（5.03±2.66）分比（1.10±0.22）分,（16.27 ±6.21）分比0分],差异均有统计学意义（均P＜0.05）;经柔肝化纤颗粒和秋水仙碱、大黄廑虫丸治疗后,大鼠肝组织炎症活动度、肝纤维化程度计分及Ⅳ胶原蛋白水平均明显降低（P＜0.05）.用药治疗后10周,病理模型组MMP-1 mRNA和TIMP-1 mRNA表达分别为（1.30±0.15）和（20.62 ±4.56）,均明显高于正常对照组[分别为（0.94±0.44）、（10.52±3.20）],差异均有统计学意义（均P ＜0.05）;柔肝化纤颗粒组MMP-1 mRNA表达为（1.58±0.34）,明显高于病理模型组、大黄廑虫丸组（1.39±0.35）和秋水仙碱对照组（1.41±0.41）;柔肝化纤颗粒组TIMP-1 mRNA为（13.6±3.3）,明显低于病理模型组、大黄廑虫丸组（18.3±4.4）和秋水仙碱对照组（17.3±4.47）（P＜0.05）;柔肝化纤颗粒组TIMP-1/MMP-1 mRNA为（8.9±2.0）,明显低于病理模型组、大黄廑虫丸组（11.1±1.9）和秋水仙碱对照组（10.4±2.4）（P＜0.05）.结论 柔肝化纤颗粒能通过调节TIMP-1/MMP-1比例来促进细胞外基质降解,从而发挥对肝纤维化的防治作用.     

替米沙坦对心肌梗死大鼠心肌重构基质金属蛋白酶表达水平的影响

目的证实替米沙坦对心肌梗死大鼠基质金属蛋白酶(MMPs)和心室重构的影响。方法结扎SD大鼠冠状动脉前降支做心肌梗死大鼠模型后,随机分为心肌梗死组15只、替米沙坦组15只,另SD大鼠开胸未结扎前降支作为对照组10只,3组均予正常饮食,其中替米沙坦组心肌梗死后予连续用药(替米沙坦3 mg.kg-1.d-1灌胃)2周。各组随机抽取5只大鼠,取梗死心肌标本组织进行苏木素-伊红(HE)染色病理检查,SABC法做MMP-2、MMP-9、心肌胶原纤维成分胶原(collagen)Ⅰc、ollagenⅢ、金属蛋白抑制因子(TIMP)-1免疫组织化学染色3,3-二氨基联苯胺(DAB)显色,用平均吸光度(A值)测定来计算MMP-2、MMP-9、collagenⅠc、ollagenⅢ、TIMP-1的表达水平,并做统计分析。结果与对照组比较,心肌梗死模型的两组大鼠间质胶原纤维增多,MMP-2、MMP-9、TIMP-1活性显著增高;替米沙坦干预组与心肌梗死组比较,间质内胶原明显减少,MMP-2、MMP-9、TIMP-1水平显著降低。结论替米沙坦可抑制大鼠心肌梗死后MMP-2、MMP-9的活性,使胶原含量和Ⅰ/Ⅲ胶原比例降低,对心肌梗死后大鼠的心室重构有改善作用。     

MMP-2、MMP-9及其抑制因子TIMP-1、TIMP-2在宫颈癌中的表达

目的分析基质金属蛋白酶2（MMP-2）和MMP-9及其抑制因子1（TIMP-1）和TIMP-2在宫颈癌不同位置中的表达情况及其临床意义。方法选取经病理证实的宫颈浸润癌患者118例（ICC组）、宫颈上皮内瘤样病变患者75例（CIN组）,取病变中心组织和边缘组织;选取正常官颈组织标本45例为对照组。采用SABC法行免疫组化检测各组中MMP-2、MMP-9、TIMP-1和TIMP-2因子表达阳性率、染色强度和表达强度。比较各组相关因子表达情况差异。结果ICC组中MMP-2和MMP-9的阳性率、染色强度和表达强度显著高于CIN组和对照组,TIMP-1和TIMP-2的阳性率、染色强度和表达强度显著低于CIN组和对照组（P〈0．05）。在ICC组,边缘癌组织的MMP-2与MMP-9的阳性率、染色强度和表达强度明显高于中心癌组织,而TIMP-1与TIMP-2的阳性率、染色强度和表达强度明显低于中心癌组织（P〈0．05）。结论MMP-2、MMP-9及其抑制因子TIMP-1、TIMP-2与宫颈癌的发生、发展密切相关,可能在宫颈癌的侵袭与转移中发挥着重要作用。     

葛根素对巨噬细胞基质金属蛋白酶9及其组织抑制物1表达的影响

目的 观察葛根素对巨噬细胞分泌和表达基质金属蛋白酶9(MMP-9)及其组织抑制因子1(TIMP-1)的影响.方法 将人单核细胞系THP-1来源的巨噬细胞与不同浓度的葛根素进行培养,采用RT-PCR和ELISA方法 分别检测巨噬细胞的MMP-9、TIMP-1的基凶和蛋白质表达.结果 葛根素对氧化低密度脂蛋白(ox-LDL)诱导THP-1细胞MMP-9 mRNA及其蛋白质表达作用呈浓度依赖性地减少MMP-9 mRNA及其蛋白的表达,但对TIMP-1的表达无影响.结论 葛根素可以通过调节巨噬细胞分泌MMP-9途径发挥稳定动脉粥样硬化斑块的作用.     

基质金属蛋白酶9抑制剂的研究进展

基质金属蛋白酶（matrix metalloproteinase,MMP）9是MMP家族中的一种明胶酶。其作用底物广泛,参与各种生理和病理过程,是降解细胞外基质的主力,研究其特异性抑制剂对慢性炎症性疾病和肿瘤具有重要意义。此文介绍了MMP-9的结构和功能,并总结了近年来的MMP-9特异性抑制剂及其特征,为进一步研究和应用提供参考。     

PTEN和基质金属蛋白酶2在胶质瘤组织中的表达及其相关性

目的探讨PTEN蛋白和基质金属蛋白酶2（MMP-2）蛋白在胶质瘤组织中的表达及意义。方法采用免疫组化SP法检测48例胶质瘤组织和25例正常脑组织中PTEN蛋白和MMP-2蛋白的表达情况。结果PTEN蛋白和MMP-2蛋白在胶质瘤中的阳性表达率分别为20．83％（10／48）、83．33％（40／48）;PTEN和MMP-2蛋白的表达与胶质瘤组织病理分级相关（x2=4．8371、4．8414,均P〈0．05）,且两者表达呈负相关（r=-0．596,P〈0．05）。结论PTEN和MMP-2在胶质瘤组织的侵袭转移中可能发挥了重要作用,检测PTEN和MMP-2的表达可作为预测胶质瘤的转移趋势指标,为胶质瘤的诊治提供临床参考。     

同型半胱氨酸对内皮细胞基质金属蛋白酶-1表达的影响

目的:观察同型半胱氨酸(Hcy)对血管内皮细胞基质金属蛋白酶-1(MMP-1)基因表达的影响.方法:体外培养人脐静脉血管内皮细胞株CRL-1730,加入不同浓度Hcy后,将细胞分为空白对照组、生理浓度组、低浓度组、中浓度组和高浓度组,提取细胞总RNA,逆转录-聚合酶链反应半定量检测MMP-1 mRNA的表达.分析各组MMP-1 mRNA的表达水平.结果:空白对照组、生理浓度组6、24 h的MMP-1 mRNA表达量低于1 h(P＜0.01),而6h与24 h的表达量差异无统计学意义(P＞0.05).低、中、高浓度组MMP-1 mRNA的表达量随时间延长而逐渐下降(P＜0.01).不同Hcy浓度组MMP-1 mRNA的表达量的比较,差异有统计学意义(F组间=131.806,P＜0.01).Hcy浓度与MMP-1 mRNA的表达量呈正相关(r=0.307,P＜0.05).结论:高浓度Hcy使血管内皮细胞MMP-1的基因表达呈剂量依赖式上调.     

Inhibitory effects of melittin on the production of lipopolysaccharide-induced matrix metalloproteinase 3 in human osteoarthritic chondrocytes

In continuation of our previous study which explored the effect of bee venom (BV) on the global gene expression profiles in lipopolysaccharide (LPS)-treated human chondrosarcoma cells, we investigated herein the effect of melittin, a major component of BV, on the productions of matrix metalloproteinases (MMPs) 1, 3, and 13 in primary cultured human arthritic chondrocytes. Increased generations of MMPs 1, 3, and 13 were observed by MMPs stimulating agents LPS, tumor necrosis factor α (TNF-α), and interleukin 1β (IL-1β). The generations of LPS (1 μg/ml)-induced MMPs 1 and 13 were not decreased by melittin, whereas that of LPS-stimulated MMP 3 was significantly inhibited by melittin. IL-1β (10 ng/ml) and TNF-α (10 ng/ml)-induced MMPs 1, 3 and 13, however, were not decreased by melittin. Immunoblot analysis revealed that melittin exerted no effect on the LPS-stimulated expression levels of MMPs 1 and 13 but attenuated the LPS-induced MMP 3, which is consistent with the enzyme-linked immunosorbent assay (ELISA) data. Taken together, these findings suggest melittin may exert its anti-arthritic effect, at least in part, by inhibiting LPS-stimulated MMP 3 production in human osteoarthritic chondrocytes.     

贝那普利对糖尿病大鼠心肌细胞外基质重塑中基质金属蛋白酶及转化生长因子表达的影响

目的研究贝那普利对糖尿病大鼠心肌基质重塑的作用机制。方法 SD大鼠ip注射链脲佐菌素制备糖尿病模型。治疗组ig给予BZ 10 mg.kg-1,连续12周。光镜及电镜下观察左心室心肌组织改变,测定心脏质量指数;Western印迹法测定左心室心肌组织胶原Ⅰ型及Ⅲ型含量,基质金属蛋白酶2(MMP-2),金属蛋白酶组织抑制因子2(TIMP-2)表达及转化生子因子β1(TGF-β1)和结缔组织生长因子(CTGF)表达的变化。结果与正常对照组相比,糖尿病组大鼠心脏质量指数明显升高,胶原Ⅰ型及Ⅲ型表达明显增加(P<0.05),MMP-2表达减少、TIMP-2表达增加(P<0.01),TGF-β1和CTGF表达明显增强(P<0.05),心肌间质纤维增生。大鼠连续ig给予贝那普利12周后,心脏质量指数明显降低〔(4.13±0.18)vs(3.42±0.13)mg.g-1〕;胶原Ⅰ型及Ⅲ型表达明显减少(P<0.05),MMP-2表达增加,TIMP-2表达减少(P<0.05),TGF-β1及CTGF表达明显减弱(P<0.05),心肌间质纤维增生减轻。与正常对照组相比,贝那普利组大鼠心肌MMP-2表达减少,TIMP-2及CTGF表达仍增加。结论贝那普利可能通过抑制糖尿病大鼠心肌组织TGF-β1和CTGF表达以及增强基质金属蛋白酶表达,从而抑制糖尿病心肌间质纤维化,改善心肌细胞外基质重塑。     

Hepatoprotective role of bis-demethoxy curcumin analog on the expression of matrix metalloproteinase induced by alcohol and polyunsaturated fatty acid in rats

Liver fibrosis is one of the major health problems worldwide. Chronic alcohol abuse is one of the main causes of fibrosis. Ingestion of polyunsaturated fatty acids (PUFA) along with alcohol further aggravates the toxicity of alcohol. Fibrosis results due to increased deposition of extra cellular matrix (ECM). The degree of abnormal ECM degradation depends on the ratio of active matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs). The present work studied the influence of bis-desmethoxy curcumin analog (BDMC-A) on the expression of MMPs and TIMPs during alcohol and ΔPUFA induced liver toxicity. Male albino Wistar rats were used for the study. The MMP expression was found to be increased in alcohol as well as ΔPUFA treated rats and decreased in alcohol + ΔPUFA treated rats. The levels of TIMPs and the collagen were increased in alcohol, ΔPUFA, and alcohol + ΔPUFA groups. Administration of BDMC-A significantly decreased the levels of collagen and TIMPs; and positively modulated the expression of MMPs. From this study, it is concluded that BDMC-A influences MMPs, TIMPs expression, and acts as an efficient anti-fibrotic agent.     

Effects of crocetin on the matrix metalloproteinases in cardiac hypertrophy induced by norepinephrine in rats

The effects of crocetin on the cardiac hypertrophy induced by long-term treatment with norepinephrine (NE) in rats have been investigated. The activities of matrix metalloproteinases (MMP-2 and MMP-9) have been assayed by gelatin SDS-PAGE zymography. The expressions of MMP-2 and MMP-9 were detected by RT-PCR. ATPase activity and hydroxyproline contents were measured with a commercial kit. The results show that crocetin blocked the development of left ventricular hypertrophy induced by NE, decreased the level of collagen in myocardium, enhanced both the Na⁺-K⁺ ATPase activity in cardiac tissue and the Ca²⁺-Mg²⁺ ATPase activity in mitochondria and inhibited significantly the activity of MMP-2 and the expressions of MMP-2 and MMP-9. These results suggest that crocetin may prevent cardiac hypertrophy induced by NE in rats.     

白芍总苷对实验性关节炎大鼠足爪组织基质金属蛋白9表达及关节浸液一氧化氮和地诺前列酮水平的影响

目的探讨白芍总苷(TGP)对大鼠胶原性关节炎治疗的可能机制。方法采用鸡胶原Ⅱ型制备实验性关节炎(CIA)大鼠模型,造模后第7~27天ig给予TPG 25,50和100 mg·kg-1。观察CIA大鼠关节指数,体质量变化及足爪组织病理学变化,免疫组化法测定大鼠足爪组织中基质金属蛋白酶9(MMP-9)的表达,采用硝酸还原法和放免法测定关节浸液中一氧化氮(NO)和地诺前列酮(前列腺素E2,PGE2)含量。结果与模型组相比,TGP可明显降低关节指数(P<0.05),且TGP50和100 mg.kg-1可有效缓解CIA模型大鼠体质量减轻(P<0.01);TGP 50和100 mg·kg-1组足爪组织MMP-9表达明显降低(P<0.05);与模型组相比,TGP还可明显降低CIA大鼠关节浸液中NO和PGE2含量(P<0.05)。结论 TGP对大鼠实验性关节炎有明显抑制作用,其作用机制可能与其下调MMP-9表达、抑制炎症局部区域相关炎症介质产生有关。     

基质金属蛋白酶抑制剂GM6001对肺炎链球菌性脑膜炎模型大鼠的脑保护作用

目的探讨基质金属蛋白酶(MMP)抑制剂GM6001对细菌性脑膜炎的脑保护作用。方法①短期治疗实验大鼠小脑延髓池穿刺注入1μl肺炎链球菌菌悬液,制备脑膜炎模型;头孢曲松组大鼠造模后24 h开始sc给予头孢曲松100 mg.kg-1,共2 d;头孢曲松+GM6001组大鼠制备模型后24 h sc给予头孢曲松100 mg.kg-1和ip给予GM6001 65 mg.kg-1共2 d;72 h后观察症状表现,检测脑含水量,测定脑脊液MMP酶活性,并进行脑组织病理学检查。②长期治疗实验分组给药和造模同短期治疗实验,给药共14 d;3周后行Morris水迷宫行为测试。结果①短期治疗实验与正常对照组相比,脑膜炎模型组,头孢曲松和头孢曲松+GM6001组大鼠症状评分明显增加,从0分别增加到(5.0±0.24)(,2.1±0.52)和(1.3±0.23)分(P<0.01);与模型组相比,头孢曲松和头孢曲松+GM6001组相比症状明显减轻(P<0.01);与正常对照组相比,模型组、头孢曲松组和头孢曲松+GM6001组MMP-9酶活性也显著升高,从36±24分别升高到1264±98,602±48和405.8±59.8(P<0.01);与模型组相比,MMP-9酶活性头孢曲松组和头孢曲松+GM6001组显著降低(P<0.01)。病理检查发现,模型组大鼠蛛网膜下腔明显扩张,充满大量炎性细胞,血管高度扩张充血,海马和皮质神经元均出现损伤表现;与模型组相比,头孢曲松组和头孢曲松+GM6001组MMP-9酶活性,海马神经元数目97±23分别增加到112±5和125±18(P<0.01),皮质神经元数目由129±21分别增加到142±8和157±24(P<0.01);脑组织含水量分别由(49.2±1.2)%下降到(48.6±0.8)%和(47.2±1.3)%(P<0.01)。②长期治疗实验与正常对照组相比,模型组Morris水迷宫行为测试大鼠到达平台时间由23±6延长到(49±9)s(P<0.01);与脑膜炎模型组相比,经头孢曲松和头孢曲松+GM6001长期治疗14 d后,Morris水迷宫行为测试大鼠到达平台时间则从49±9明显缩短到33±8和(40±8)s(P<0.01)。结论基质金属蛋白酶抑制剂GM6001能减轻肺炎链球菌性脑膜炎脑组织的水肿,减少神经元死亡,提高大鼠空间记忆能力,具有神经保护作用。     

Thermal decomposition of matrix metalloproteinase inhibitors: evidence of solid state dimerization

The thermal properties of three matrix metalloproteinase (MMP) inhibitors were investigated using a variety of instrumental methods. Differential scanning calorimetry revealed highly exothermic processes for all compounds above 200°C, and thermogravimetric analysis resulted in significant step-wise weight losses at the temperatures corresponding to the exothermic transitions. Hot stage microscopy observations for several compounds showed evolution of gas bubbles from crystals at temperatures that correlated with the exotherms. Thermal decomposition involving the hydroxamic acid functional group was suspected and further evaluated using various analytical techniques including reversed-phase HPLC, LC-MS-MS, TGA-FTIR and NMR. The mechanism proposed in the thermal decomposition involves a Lossen Rearrangement to form a dimeric species containing a urea linkage.     

缺血性心脏病患者血浆基质金属蛋白酶2和基质金属蛋白酶9与心脏重塑关系

目的探测缺血性心脏病（IHD）患者血浆基质金属蛋白酶2（MMP-2）、MMP-9活性水平与心脏重塑指标左心室质量指数（LVMI）之间的关系。方法选取2007年5月至2010年9月北京安贞医院住院的IHD患者254例,根据LVMI不同分为心脏重塑组（128例）和非心脏重塑组（126例）。对照组为214例门诊健康体检心脏功能正常的健康人。利用明胶酶谱方法测定各组受试者血浆MMP．2、MMP-9的活性水平,分析两者与心脏重塑指标的关系。结果心脏重塑组患者血浆MMP-2、MMP-9的活性高于对照组和非心脏重塑组[MMP-2：（13．0±2．9）m2／（g·L^-1）比（8．9±2．3）、（10．9±2．9）m2／（g·L^-1）;MMP-9：（2．6±1．0）m2／（g·L^-1）比（1．4±0．4）、（2．1±0．7）m2／（g·L^-1）,均P〈0．05],非心脏重塑组患者的MMP-2、MMP-9活性水平高于对照组（P〈0．05）。血浆MMP-2、MMP-9活性水平与LVMI明显相关（r=0．464、0．516,均P〈0．05）。结论MMP-2、MMP-9在IHD患者心脏重塑的发生和发展过程中起着一定作用,有可能用来预测IHD患者发生心脏重塑的进展及预后。     

银杏叶提取物对糖尿病大鼠肾脏基质金属蛋白酶2表达的影响

目的 观察银杏叶提取物(GbE)对雄性SD糖尿病大鼠肾脏基质金属蛋白酶2(MMP-2)和Ⅳ型胶原表达的影响,从而探讨银杏叶对糖尿病肾病的保护机制.方法 24只链脲佐菌素诱导的SD大鼠完全随机分成糖尿病对照组(DM组)和GbE组,并以12只正常雄性SD大鼠作为正常对照组(NC组).分别于4、8周后,观察各组大鼠体重、肾重、随机血糖、尿蛋白排泄率等生化指标,并用免疫组化和逆转录聚合酶链反应方法 观察糖尿病大鼠肾脏MMP-2及Ⅳ型胶原的表达.结果 糖尿病大鼠的随机血糖、体重、肾脏/体重明显下降,尿白蛋白排泄率明显升高[DM组(31.59±4.59)mg/24 h比NC组(8.74±2.08)mg/24 h,P＜0.05],GbE组糖尿病大鼠尿白蛋白排泄率[(21.38±3.86)mg/24 h]较DM组有所下降(P＜0.05).8周时,与正常对照组相比,DM组大鼠肾小球MMP-2蛋白的表达水平明显下降[(0.49±0.07)mg/24 h比(0.15±0.04)mg/24 h,P＜0.05],而GbE组DM组大鼠肾小球MMP-2蛋白的表达水平[(0.48±0.07)mg/24 h]较DM组无明显下降(P＞0.05);DM组大鼠Ⅳ型胶原的表达水平较NC组明显升高[(3.48±0.54)mg/24h比(1.68±0.51)mg/24 h],而GbE组糖尿病大鼠较NC组无明显升高[(2.55±0.50)mg/24 h比(1.68±0.51)mg/24 h].结论 GbE可通过抑制糖尿病大鼠MMP-2过表达,进而对糖尿病肾病发挥保护作用.

Abstract：

Objective To study the effect of ginkgo biloba extract (GbE) on the expression of matrix metalloproteinase (MMP)-2 in kidneys of diabetic rates and to analyze the protecting mechanism of GbE on diabetic nephropathy. Methods Totally 24 SD rats of diabetic nephropathy induced by streptozotocin were randomly divided into two groups: diabetes group and treatment group with GbE, and 12 rats with placebo therapy were enrolled as the normal control group. Rats were killed after 4 ～ 8 weeks treatment and the expression of MMP-2 and type Ⅳ collagen were studies by immunohistochemistry and RT-PCR. Results In diabetic rats, blood sugar, weight and kidney/body weight ratio were decreased significantly and the excretion of 24 hour urinary protein was increased significantly compared to the diabetes group. But the excretion of 24 hour urinary protein was improved in GbE group ( P ＜0.05 ). The expression level of MMP-2 protein and mRNA was decreased significantly in renal glomduri of diabetic rats ( P ＜ 0.05 ) but showed no changes in GbE treatment group compared to diabetes group( P ＞ 0.05 ). The expression level of type Ⅳ collagen was significantly increased in diabetic rats( P ＜0.05 ) but showed no changes in GbE group( P ＞0.05). Conclusion GbE can improve diabetic nephropathy by inhibiting the expression of MMP-2 in diabetic Rat.     

基质金属蛋白酶-9在非小细胞肺癌组织中的表达及意义

目的检测基质金属蛋白酶9(MMP-9)在非小细胞肺癌(Non small cell lung cancer,NSCLC)的表达,探讨其与NSCLC侵袭转移的关系。方法用免疫组化法检测42例NSCLC患者肺癌组织与30例癌旁正常肺组织MMP-9蛋白的表达水平。结果 MMP-9蛋白在肺癌组织的表达高于正常肺组织(P<0.05),MMP-9在有淋巴结转移肺癌组织的表达高于无淋巴结转移肺癌组织的表达(P<0.05),且其表达与NSCLC患者临床分期相关(P<0.05)。MMP-9的表达与NSCLC患者的性别、年龄、组织学类型均无明显相关性(P>0.05)。结论 MMP-9的表达与NSCLC的侵袭转移有关,可成为评价NSCLC恶性程度和预后的辅助指标。     

氟喹诺酮类药物对大鼠肝外组织药物代谢酶的影响

目的:探讨氟喹诺酮类药物(FQs)对大鼠肺、脑、肾、小肠中细胞色素P450(CYP)含量、氨基比林N- 脱甲基酶(AMND)、红霉素N-脱甲基酶(ERND)活性的影响。方法:体外实验中环丙沙星、妥苏沙星和司帕沙星的药物终浓度均为1 mmol·L-1;体内实验按1 mmol·kg-1剂量灌胃,qd×7。制备大鼠肺、脑、肾、小肠S9,分光光度法测定CYP含量、AMND及ERND活性变化。结果:大鼠肺、肾组织CYP含量低;3种药物可不同程度地抑制各组织AMND活性(P<0．05)。肾和小肠中可测到ERND活性,而肺、脑中未测到;给药后肾、小肠 ERND活性有降低趋势,但大多无显著差异。结论:FQs对肝外组织CYP含量无显著影响,对AMND活性有抑制作用,对ERND有抑制趋势。