基质金属蛋白酶MMP-2、MMP-9及其抑制因子TIMP-1、TIMP-2在子宫内膜异位症血清中的表达及临床意义

目的探讨基质金属蛋白酶MMP-2、MMP-9及其抑制因子TIMP-1、TIMP-2在子宫内膜异位症（EMs）血清中的表达及临床意义。方法采用双抗体夹心酶联免疫吸附法（ELISA）检测55例EMs患者和30例对照组血清中删P-2,MMP-9、TIMP-1和TIMP-2水平。结果BMs组血清中MMP-2和MMP-9水平显著高于对照组,TIMP-1和TIMP-2水平显著低于时照组（P〈0．05）。Ⅲ-Ⅳ期血清MMP-2和MMP-9水平显著高于Ⅰ-Ⅱ期和对照组,TIMP-1和TIMP-2水平显著低于Ⅰ-Ⅱ期和对照组（P〈0．05）。结论MMP-2、MMP-9与Elds发生和发展相关,TIMP-1、TIMP-2对MMP-2、MMP-9水平调节有重要作用。     

Differential expression of stromal MMP-1, MMP-9 and TIMP-1 in basal cell carcinomas of immunosuppressed patients and controls

Matrix metalloproteinases (MMPs) have an important role in the initiation, growth, and invasion of malignant tumors. Basal cell cancer (BCC) is the most common human malignancy. The risk of BCC is 10–16 times higher among organ transplant recipients compared with the nontransplanted population. The aim of this study was to compare the expression of several MMPs and their tissue inhibitors (TIMPs) in BCCs from kidney transplant recipients and controls. Expression of MMPs-1, -7, -8, -9, -10, -13, -26, and TIMPs-1 and -3 was evaluated by immunohistochemistry in 25 samples of BCC of kidney transplant recipients and 25 matched controls representing superficial and nodular subtypes. No significant differences were detected in MMP expression of BCC tumor cells between immunocompetent and immunodeficient patients. However, MMPs-1 and -9 and TIMP-1 were expressed more frequently in stromal macrophages in the BCCs of immunocompetent patients. When tumor subtypes were compared irrespective of the patient group, more MMP-1-positive fibroblasts and MMP-9-positive neutrophils were detected in the superficial subtype, while stromal MMP-10 expression was more abundant in nodular tumors. Our results suggest that abundant peritumoral expression of TIMP-1 in non-immunocompromised patients limits ECM degradation permissive for cancer cell migration.     

非小细胞肺癌组织中MMP-9、TIMP-1表达及意义

目的 探讨非小细胞肺癌(non-small cell lung cancer,NSCLC)组织中基质金属蛋白酶9(MMP-9)、组织金属蛋白酶抑制剂-1(TIMP-1)的表达及其生物学行为的关系.方法 应用免疫组织化学SP法检测76例NSCLC和癌旁正常组织中MMP-9、TIMP-1的表达,并分析其表达与肺癌组织类型、肿瘤大小、TNM分期、分化程度、淋巴结转移的相关性.结果 MMP-9、TIMP-1在肺癌组织中的阳性表达率明显高于癌旁正常组织(P<0.05).NSCLC中MMP-9、TIMP-1表达与肿瘤的分化程度、临床分期、淋巴结转移有相关性(P<0.05),与肿瘤病理分型无关(P>0.05).结论 检测NSCLC中组织的MMP-9、TIMP-1的表达对判断肿瘤的恶性程度和预后评估有一定的意义.     

MMP-9/TIMP -1在子宫内膜细胞中的多因素调节

目的通过体外实验研究E2、MPA、HB-EGF对Ishikawa细胞中MMP-9/TIMP-1 mRNA表达的调节,探讨其在胚胎种植中的意义.方法体外培养Ishikawa细胞,分别加入E2、MPA、E2 MPA、E2 MPA RU486、HB-EGF刺激48h后,采用原位杂交、RT-PCR测定各种条件下MMP-9、TIMP-1 mRNA的表达.结果雌、孕激素单独或联合作用均可以显著降低TIMP-1 mRNA的表达(P<0.05),同时加RU486后TIMP-1 mRNA的下降趋势减弱.相反HB-EGF 使TIMP-1 mRNA的表达增高(P<0.05).Ishikawa细胞中MMP-9 mRNA均没有阳性表达.结论 (1)雌、孕激素对TIMP-1 mRNA具有下调作用,RU486可以抑制孕激素的作用.(2)HB-EGF对TIMP-1 mRNA的表达具有上调作用.(3)MMP-9 mRNA在Ishikawa细胞中没有表达.     

MMP-9及TIMP-1在恶性外周神经鞘膜瘤中的表达及意义

目的探讨恶性外周神经鞘膜瘤(malignant peripheral nerve sheath tumours,MPNST)中基质金属蛋白酶-9(matrix metalloproteinase-9,MMP-9)及组织金属蛋白酶抑制剂-1(tissue inhibitor of metalloproteinase-1,TIMP-1)的表达与病理分级、转移及预后的关系。方法采用免疫组化S-P法检测MPNST中MMP-9及TIMP-1表达。结果共检测了58例MPNST,其中MMP-9阳性表达率为89.7%(52/58),TIMP-1阳性表达率是60.3%(35/58)。MMP-9蛋白酶的表达与病理学分级、转移率呈正相关,与术后生存率呈负相关;而TIMP-1则相反。结论MMP-9、TIMP-1与MPNST病理学分级、转移及术后生存期有关,可作为判断恶性外周神经鞘膜瘤恶性程度及预后的可靠指标,为其治疗提供参考价值。     

哮喘豚鼠MMP-9、TIMP-1免疫反应的变化及与气道重塑的关系

目的　观察实验性哮喘豚鼠气道平滑肌基质金属蛋白酶 9(MMP 9)及其抑制剂 (TIMP 1)的表达以及气道平滑肌厚度的变化。方法　用免疫组织化学结合显微图像分析测定气道平滑肌MMP 9、TIMP 1免疫反应的变化及气道平滑肌厚度。结果　MMP 9、TIMP 1广泛分布于气道平滑肌。哮喘组MMP 9平均灰度值(10 5 94± 6 0 9)明显低于对照组 (12 0 2 5± 3 6 6 ) (P <0 0 1) ;哮喘组TIMP 1平均灰度值 (99 36± 5 71)明显低于对照组 (12 3 4 5 7) (P <0 0 1) ;哮喘组气道平滑肌厚度 (6 45± 1 83μm2 / μm)明显高于对照组 (3 17± 0 85 )(P <0 0 5 )。结论　MMP 9、TIMP 1可能参与哮喘时气道重塑。     

子宫肌瘤患者中TIMP-3和IMMP-13的检测意义

目的比较UL（子宫肌瘤）组织和瘤旁子宫正常组织内的TIMP-3（基质金属蛋白酶抑制因子3）和MMP-13（基质金属蛋白酶一13）的表达差异及TIMP-3与MMP-13之间的相关性,以探讨UL的发生发展与两者间的关系。方法分析2012年4月至2014年4月在我院接受部分子宫切除或全切术治疗的UL患者的临床资料。用石蜡将手术切除的UL组织和瘤旁正常组织包埋做标本,免疫组织化学染色SP法检测TIMP-3和MMP-13的表达。比较UL组织和瘤旁组织的TIMP-3、MMP-13的阳性表达率,并分析TIMP-3与mmP-13表达间的相关性。结果本研究共纳入UL患者50例,其中包括UL组织和癌旁正常组织各50个。UL组织的MMP-13阳性表达率显著高于瘤旁组织（X//62=36．24,P〈0．01）;UL组织的TIMP-3阳性表达率显著高于瘤旁组织（X^2=9．632,P=0．022）;UL组织中mmP-13和TIMP-3的表达情况两者间有着显著的相关性（r=0.603,P=O．021）。结论UL的发生发展与TIMP-3和mmP-13的关系密切。     

MMP-2、MT1-MMP、TIMP-2在胎膜早破中的作用

目的通过检测不同情况产妇胎膜组织中基质金属蛋白酶2(matrix metalloproteinase-2,MMP-2)及其激动剂(membrane type 1-matrix metalloprotease MT1-MMP)和其特异性组织抑制剂(tissue inhibitor of matrix metalloproteinases-2,TIMP-2)的表达,以探讨MMP-2在胎膜早破中的作用.方法 RT-PCR和S-P法对20例自发性胎膜早破患者、20例正常分娩产妇的胎膜组织中MMP-2、TIMP-2 mRNA和MT1-MMP蛋白的表达及定位进行检测.结果 (1)MMP-2 mRNA在胎膜早破组表达明显高于正常分娩组,两者比较,差异有显著性(P＜0.05).(2)TIMP-2 mRNA在正常分娩组表达高于胎膜早破组,两者比较差异有显著性(P＜0.05).(3)MT1-MMP蛋白在胎膜早破组表达明显高于正常分娩组,两者比较,差异有显著性(P＜0.05).MT1-MMP在羊膜细胞和绒毛膜的滋养细胞内表达.主要在细胞浆内表达.结论胎膜早破中,MMP-2及其人调节剂的表达失调将可能导致胎膜基质的降解增加并最终导致胎膜的破裂.     

Upregulation of MMP-9/TIMP-1 enzymatic system in eosinophilic meningitis caused by Angiostrongylus cantonensis

Proteolysis depends on the balance between the proteases and their inhibitors. Matrix metalloproteinase-9 (MMP-9) and its specific inhibitors, tissue inhibitors of metalloproteinases (TIMP), contribute to eosinophilic inflammatory reaction in the subarachnoid space of the Angiostrongylus cantonensis-infected mice. The expression of MMP-9 in cerebrospinal fluid (CSF) was significantly increased in mice with eosinophilic meningitis, compared to that in uninfected ones. However, the TIMP-1 levels were unchanged and remained at basal levels at all time points, even in uninfected mice. Elevated MMP-9 mRNA expression coincided with protein levels and proteolytic activity, as demonstrated by means of positive immunoreactivity and gelatin zymography. CSF protein contents correlated significantly with MMP-9 intensity and CSF eosinophilia. In addition, immunohistochemistry demonstrated MMP-9 and TIMP-1 localization in eosinophils and macrophages. When the specific MMP inhibitor, GM6001, was added, MMP-9 enzyme activity was reduced by 45.4%. The percentage of eosinophil increased significantly upon the establishment of infection, but subsided upon inhibition. These results show that MMP-9/TIMP-1 imbalance in angiostrongyliasis may be associated with eosinophilic meningitis.     

肺癌MMP-9、TIMP-1表达与微血管密度的关系及意义

目的探讨肺癌组织中MMP-9和TIMP-1的表达与肺癌血管生成的关系及其意义。方法采用免疫组化SP法检测84例肺癌组织中MMP-9、TIMP-1和CD34的表达。结果肺癌组织MMP-9表达显著高于癌旁正常肺组织(P<0.01),小细胞肺癌和腺癌显著高于鳞癌(P<0.01)。肺癌MMP-9表达:有淋巴结转移者高于无淋巴结转移者(P<0.01),Ⅲ~Ⅳ期高于Ⅰ~Ⅱ期(P<0.05)。肺癌组织TIMP-1表达显著高于癌旁正常肺组织(P<0.01)。肺癌MMP-9表达阳性者微血管密度高于MMP-9表达阴性者(P<0.01)。结论MMP-9促进肺癌血管生成,与肺癌侵袭转移密切相关。     

Aspirin Inhibits MMP-2 and MMP-9 Expression and Activity Through PPARα/γ and TIMP-1-Mediated Mechanisms in Cultured Mouse Celiac Macrophages

Aspirin is an anti-inflammatory drug, and has been widely used for the prevention of cardio-cerebrovascular events. Matrix metalloproteinase (MMP)-2 and MMP-9 can degrade the extracellular matrix and may be critical for the development and disruption of atherosclerotic plaques, while tissue inhibitor of metalloproteinase (TIMP)-1 may inhibit the degradation of extracellular matrix. The purpose of present study was to investigate the inhibitory effects of aspirin on MMP-2 and MMP-9 expression and activity in cultured mouse celiac macrophages, and to determine the possible mechanisms. The results showed that MMP-2/9 mRNA expression and release were significantly decreased after cultured mouse celiac macrophages were treated with aspirin 12.5–50 μg/ml for 24 h, while the TIMP-1 mRNA expression and release, and peroxisome proliferator-activated receptor (PPAR) α/γ mRNA expression were increased after the same treatment. Moreover the aspirin-induced down-regulation of MMP-2/9 mRNA expression and reduction of MMP-9 release were notably alleviated after pretreatment with specific inhibitors of PPARα/γ. These results suggested that aspirin could inhibit the expression and release of MMP-2/9 by up-regulation of PPARα/γ gene expression, and also inhibit the activity of MMP-2/9 by induction of TIMP-1 expression, which might be good for the stabilization of atherosclerotic plaques and the prevention of cardio-cerebrovascular events.     

佐剂性关节炎大鼠心功能及心肌MMP-9、TIMP-1变化

目的:观察佐剂性关节炎(Adjuvant Arthritis,AA)大鼠心功能、MMP-9及TIMP-1蛋白在心肌中表达。方法:将24只大鼠随机分为正常对照组(Normal Control,NC)、模型对照组(Model Control,MC),每组12只,分别向模型对照组动物右后足跖皮内注射弗氏完全佐剂(Freund’s Adjuvant Complete,CFA)致炎,致炎48天后,观察两组大鼠足跖肿胀度及关节炎指数(Arthritis Index,AI),分别通过小动物多道生理记录仪和超声心动图检测心功能,HE染色观察心脏组织病理学改变,免疫组化染色法检测基质金属蛋白酶9(Matrix Metallo Proteinase 9,MMP-9)、基质金属蛋白酶抑制因子-1(Tissue Inhibitor of MetalloProteinase-1,TIMP-1)的蛋白表达情况,ELISA法测定血清细胞因子的变化,流式细胞仪测定调节性T细胞(Regulation T cell,Treg)的表达。结果:①与NC组比较,MC组大鼠致炎12天体重出现下降,于致炎48天体重下降至最高峰;致炎18天足跖肿胀度达最高峰。②与NC组比较,MC组的舒张早期血流峰值速度(early diastolic peak flow velocity,E)、E/A、短轴缩短分数(left ventricular fraction shortening,FS%)显著降低(P<0.05或P<0.01),舒张晚期血流峰值速度(late diastolic peak flow ve-locity,A)显著升高(P<0.01)。与NC组比较,MC组心率(heart rate,HR)、心脏质量指数(heart index,HI)、左室收缩末压(Left Ventricular Systolic Pressure,LVSP)、左室舒张末压(Left Ventricular End-diastolic Pressure,LVEDP)显著升高(P<0.05),左室内压上升/下降最大速率(Maximum Rate of Ventricular Pressure of development or decline,±dp/dtmax)显著降低(P<0.05)。③与NC组比较,MC组TNF-α、BNP、IL-17显著升高(P<0.05或P<0.01),IL-10、CD4+Treg、CD4+CD25+Treg显著降低(P<0.01)。④与NC组比较,MC横截面心肌细胞横径值(TDM/μm)显著升高(P<0.05),MMP-9表达量在MC组大鼠心肌细胞显著升高(P<0.01);TIMP-1的表达量则显著降低(P<0.01)。⑤Spearman相关性分析显示:心功能参数E峰与TIMP-1蛋白染色指数呈正相关;A峰与TIMP-1蛋白染色指数呈正相关,与MMP-9呈负相关;心脏质量指数(HI)与关节炎指数(AI)呈正相关;+dp/dtmax与IL-17呈显著负相关,与TIMP-1蛋白染色指数呈正相关;-dp/dtmax与IL-10呈负相关(P<0.05)。结论:AA大鼠存在心功能下降。其机制可能是大鼠在致炎后对抗原刺激呈高敏反应状态,免疫调节功能紊乱,释放大量细胞因子和炎症介质,导致局部关节的病变的同时,心肌细胞及细胞外基质亦发生损害,从而发生AA心功能降低。     

Matrix metalloproteinases MMP-7, MMP-9 and their tissue inhibitor TIMP-1: expression in chronic sinusitis vs nasal polyposis

BACKGROUND: Nasal polyps (NP) are characterized by pseudocyst formation, whereas the mucosa in chronic sinusitis (CS) only shows a limited oedema. Matrix metalloproteinases (MMPs) are a family of endopeptidases able to degrade the extracellular matrix. Differences in histological features between CS and NP might be related to the respective expression of MMPs and their tissue inhibitors (TIMPs). OBJECTIVE: The aim of this study was to investigate MMP-7, MMP-9 and TIMP-1 proteins in NP and CS in comparison with normal mucosa. METHODS: Nasal samples, obtained from controls (n = 10), from NP (n = 8) and from CS (n = 10), were analysed by immunohistochemistry and enzyme-linked immunosorbent assay (ELISA). RESULTS: In NP, compared with controls, staining for MMP-9 and MMP-7 appeared in blood vessels. Matrix metalloproteinase-9-positive inflammatory cells could be detected in increased numbers in pseudocyst formations. Concentrations of MMP-9 protein was found significantly increased in both CS and NP compared with controls, while MMP-7 was significantly increased in NP compared with controls and CS. Tissue inhibitors of metalloproteinase-1 protein was significantly increased in CS and NP when compared with controls. CONCLUSIONS: Chronic sinusitis and NP show different pattern of MMP-7/-9 and TIMP-1 expression. We suggest that this difference in regulation of enzymes is related to the respective tissue remodelling observed in both diseases.     

Gingival fibroblasts inhibit MMP-1 and MMP-3 activities in an ex-vivo artery model

The main arterial pathologies can be associated with a deregulation of remodeling involving matrix metalloproteinases (MMPs), whereas gingival healing is characterized by an absence of fibrosis or irreversible elastin/collagen degradation. The aim of our study was to evaluate the effect of gingival fibroblasts on MMP-1 and MMP-3 secretion in an organotypic artery culture. MMP-1 and MMP-3 secretions and activities (dot blots, zymography, ELISA) were evaluated in coculture of rabbit artery in the presence or not of gingival fibroblasts. MMP-1/TIMP-1 and MMP-3/TIMP-1 complexes forms were measured by ELISA. Complementary studies were performed using human aortic smooth muscle cells cocultured with adventitial, dermal, or gingival fibroblasts. Our results indicated that MMP-1 and MMP-3 free-forms activities were significantly reduced in coculture. This inhibition was linked to a significant increase of TIMP-1 leading to formation of TIMP-1/MMPs complexes. Due to the presence of gingival fibroblasts, the decrease in MMP-1 and MMP-3 efficiency thus contributes to diminish the degradation of artery. This cellular therapy strategy could be promising in artery pathologies treatment.     

两种冠边缘设计对龈沟液中MMP-8及其组织抑制剂-1水平的影响

目的:探讨两种冠边缘设计对龈沟液(GCF)中基质金属蛋白酶-8(MMP-8)及其组织抑制剂-1(TIMP-1)水平的影响.方法:收集行烤瓷熔附金属全冠修复的患者16例(26颗牙),分为龈下组(8例,14颗牙)和平龈组(8例,12颗牙).分别于修复前、修复后1个月、3个月、6个月时收集两组受试牙的GCF,应用ELISA法测定GCF中MMP-8及TIMP-1的含量.结果:以修复前GCF中MMP-8和TIMP-1的含量为基线,龈下组GCF中MMP-8的含量在修复后1个月时明显高于基线水平(P＜0.05),修复后3个月时持续升高,在修复后6个月时开始下降,但仍高于基线水平(P＜0.05).而平龈组GCF中MMP-8的含量在修复后1个月、3个月时有所升高,但与基线水平比较差异无显著性,在修复后6个月时下降,恢复至基线水平.龈下组和平龈组GCF中TIMP-1的含量在修复后1个月、3个月、6个月时,均呈逐渐升高的趋势,两组在修复后各时间点TIMP-1的含量均明显高于基线水平(P＜0.05).组间比较,平龈组修复后各时间点GCF中MMP-8的含量均明显低于龈下组(P＜0.05);而TIMP-1的含量则均明显高于龈下组(P＜0.05).结论:冠边缘平龈设计可能更有利于MMP-8/TIMP-1系统在牙周组织中更新、代谢和改建过程中的表达作用,以及牙龈组织的健康.     

MMP-9和TIMP-1在高血压合并糖尿病周围神经病大鼠坐骨神经的表达

目的探讨高血压(HTN)合并糖尿病周围神经病(DPN)大鼠模型坐骨神经中基质金属蛋白酶-9(MMP-9)和组织金属蛋白酶抑制剂-1(TIMP-1)的表达。方法实验大鼠分为正常组、HTN组、DPN组和DPN+HTN组。造模后4w检测各组血糖、血压及坐骨神经传导速度,RT-PCR检测坐骨神经MMP-9mRNA和TIMP-1mRNA表达。结果与正常组和HTN组比较,DPN组和HTN+DPN组血糖显著增高,神经传导速度显著降低(0.01),坐骨神经MMP-9mRNA和TIMP-1mRNA表达显著上调(0.01)。与DPN组比较,HTN+DPN组血压显著增高,神经传导速度显著降低,坐骨神经MMP-9mRNA表达较DPN组上调,TIMP-1 mRNA表达显著下降(0.01)。。结论高血压合并糖尿病周围神经病坐骨神经MMP-9mRNA表达上调,TIMP-1mRNA表达下调,可能与抑制施万细胞和髓鞘形成加剧周围神经损伤相关。     

川崎病患儿血清MMP-9、TIMP-1、ET-1水平的变化及其临床意义

目的探讨川崎病（KD）患儿不同时期血清基质金属蛋白酶（MMP-9）、组织基质金属蛋白酶抑制物（TIMP-1）、内皮素-1（ET-1）水平的变化及其与冠状动脉病变之间的关系。方法采用酶联免疫吸附法（ELISA）、放免法（RIA）对34例KD患儿急性期、治疗后5d、亚急性期和恢复期血清MMP-9、TIMP-1、ET-1水平进行检测,并与34例正常健康儿童进行对照。同时应用心脏彩超检测KD患儿冠状动脉的病变。结果KD患儿不同时期血清MMP．9、TIMP．1、ET-1水平及MMP-9／TIMP-1比值组间有差异。KD患儿血清MMP-9、TIMP-1、MMP-9／TIMP-1及ET-1（292．56±28．65）μg／L、（394．50±46．80）μg／L、（0．75±0．11）、（80．65±14．00）pg／ml均明显高于正常对照组（27．53±11．67）／μg／L、（100．47±32.96）μg/L、（0．28±0．10）、（52．70±11．39）pg／ml,其中冠脉扩张组血清MMP-9／TIMP-1显著高于无扩张组,且与冠脉扩张程度呈正相关（r=0．83）,而扩张组血清MMP-9、ET-1水平与无扩张组之间无显著差异,血清TIMP-1水平低于无扩张组。结论血清MMP-9、TIMP-1、ET-1可能参与了川崎病的病理发病机制,血清MMP-9／TIMP-1持续失衡,可作为预测川崎病并发冠状动脉炎,尤其是冠状动脉扩张的生化指标之一。     

正畸力作用下人龈沟液MMP-9及TIMP-1的水平变化及意义

目的:探讨正畸力作用下龈沟液内基质金属蛋白酶-9(MMP-9)及金属蛋白酶组织抑制因子-1(TIMP-1)水平的动态变化及其临床意义.方法:选择口腔科门诊就诊接受正畸治疗的患者20例.随机分成2组(A、B组),每组10人.分别施加100 g、250 g的远中移动的初始力,在加力前0周及加力后1、2、3、4、5、6、7周...     

HIE患儿血清MMP-9及TIMP-1水平变化及临床意义

目的探讨MMP-9、TIMP-1在HIE患儿血清中表达的临床意义。方法采集正常新生儿和30例HIE患儿（按病情分为轻度、中度、重度3组）发病后1、3、7d血液,采用ELISA法检测MMP-9,透射比浊法检测TIMP-1浓度,并与正常组进行比较分析。结果轻、中、重度3组HIE患儿血清MMP-9与TIMP-1水平于发病后1、3、7d与对照组比较均升高,差异有统计学意义（P〈0.05）;3组患儿中尤以重度组增高显著（P〈0.01）,且发病第3天MMP-9与TIMP-1均达峰值。结论 MMP-9、TIMP-1参与了HIE的发病,检测其血清水平对疾病严重程度及预后有一定的提示作用。     

γ射线对C57BL/6J和C3H/HeN小鼠肺成纤维细胞生物学行为影响的比较研究

目的比较C57BL/6J和C3H/HeN两种小鼠肺成纤维细胞以不同剂量的60Coγ射线照射后生物学行为的异同。方法原代分离培养C57BL/6J和C3H/HeN两种小鼠肺成纤维细胞(LF),应用2、4、6和8Gy的60Coγ射线照射后,通过MTT比色法、流式细胞术、AgNOR染色和免疫荧光细胞化学染色法,检测照射后两种LF的增殖活力、细胞周期以及a-平滑肌肌动蛋白(a-SMA)、基质金属蛋白酶-1(MMP-1)和金属蛋白酶组织抑制剂-1(TIMP-1)表达的变化。结果以2~8Gy照射后,C57BL/6J和C3H/HeN小鼠的LF增殖活力与正常对照组相比较未见明显增强。照射后,C57BL/6J小鼠的LF非整倍体增多,a-SMA高表达,MMP-1的表达呈弱阳性,TIMP-1的表达呈增强趋势。照射后,C3H/HeN小鼠的LF出现G2-M期阻滞,a-SMA的表达减弱至消失,MMP-1和TIMP-1的表达均呈增强趋势。结论以60Coγ射线照射后,C57BL/6J和C3H/HeN两种小鼠的LF生物学行为不同,C57BL/6J小鼠的LF呈“活化”状态,为该种小鼠易发生肺纤维化的细胞学基础提供了实验依据。