67 ku层黏连蛋白受体与肿瘤侵袭和转移

层黏连蛋白是细胞外基质重要的成分之一。67 ku层黏连蛋白受体(67 ku laminin receptor,67 LR)是层黏连蛋白的一个非整合素受体。它是一种多功能蛋白,既参与核糖体的组装、成熟过程,又参与细胞的信号转导,还可作为多种病毒的细胞膜受体。可以和层黏连蛋白相互作用,调节肿瘤的增殖、黏附、微血管形成,加速细胞外基质的降解,促进肿瘤的侵袭转移,其作用机制可能与MAPK信号通路有关。67 LR在多种肿瘤中高表达,还可以作为肿瘤免疫治疗的靶标。     

纤黏连蛋白重组多肽CH50抑制黑色素瘤MMP-2和MMP-9表达、激活的研究

目的研究纤黏连蛋白重组多肽CH50对黑色素瘤B16细胞侵袭能力的影响,探讨CH50多肽抑制肿瘤生长、侵袭的机制。方法体外培养小鼠黑色素瘤B16细胞、小鼠腿部皮下注射B16细胞建立肿瘤动物模型。采用明胶电泳法检测B16细胞和黑色素瘤组织中基质金属蛋白酶MMP-2和MMP-9的表达和激活;以CH50多肽体外处理B16细胞或体内表达CH50,观察CH50下调MMPs表达以及对肿瘤细胞侵袭能力的抑制作用。结果B16细胞在体外培养条件下主要表达MMP-2,而在肿瘤微环境中则同时表达MMP-2和MMP-9。肿瘤组织中MMPs的表达明显高于体外培养B16细胞。CH50多肽对体外培养B16细胞的MMPs表达和激活无明显抑制作用,但处理后的B16细胞进入体内后表达MMPs的能力受到明显抑制。体内转染表达的CH50多肽亦可明显抑制肿瘤表达MMPs、并抑制肿瘤侵袭能力。结论纤黏连蛋白重组多肽CH50可以抑制肿瘤微环境中基质金属蛋白酶MMP-2和MMP-9的表达和激活,从而抑制黑色素瘤生长及侵袭能力。     

乙酰肝素酶、层黏连蛋白及其受体的表达以及在卵巢癌转移中的作用

目的 :探讨乙酰肝素酶mRNA(acetyl heparanasemRNA)、层黏连蛋白 (laminin ,LN)及其受体 (lamininrecepter,LR) ,在 5 0例卵巢癌、33例淋巴结转移卵巢癌及 10例浆液性囊腺瘤中的表达 ,及其在卵巢癌转移中的作用。方法 :应用原位杂交和免疫组化染色方法 ,检测乙酰肝素酶mRNA转录水平及LN和LR的蛋白的表达及定位。结果 :乙酰肝素酶mRNA在卵巢癌病灶及转移淋巴结中的转录水平明显增强 ,原发灶与转移灶之间的表达差异显著 (P <0 .0 5 ) ,恶性肿瘤与良性肿瘤之间表达的差异更为明显 (P <0 .0 1)。LN在癌组织及转移淋巴结中的表达少 ;而LR的表达却明显增强。乙酰肝素酶mRNA与LN表达呈负相关 ,与LR的表达呈正相关。结论 :乙酰肝素酶mRNA的表达与LN和LR的表达之间分别呈正、负相关性 ,提示乙酰肝素酶是参与肿瘤的生长、侵袭和转移的方式之一     

层黏连蛋白受体在小鼠睾丸和附睾中的表达

目的 探讨层黏连蛋白受体(LAMR1)在小鼠睾丸和附睾中的表达.方法收集3只正常成年昆明小鼠睾丸和附睾.采用原位杂交和免疫组织化学方法,检测LAMR1 mRNA及蛋白在成年小鼠睾丸和附睾中的分布.结果 LAMR1 mRNA在附睾头和附睾尾表达最强;在睾丸生精细胞中也有表达.免疫组织化学结果显示,LAMR1蛋白从附睾头到...     

施万细胞的层黏连蛋白表达变化及两者关系的初步研究

目的:观察层黏连蛋白(laminin,LN)在坐骨神经发育过程中的表达情况,以及LN和施万细胞(Schwann cells,SCs)的相互关系。方法:取E14、E17、P1和成年SD大鼠坐骨神经,免疫荧光组织化学染色检测LN表达情况;体外培养大鼠来源的SCs,经过外源性LN处理后,免疫荧光细胞化学染色检测LN、nidogen、type IVcollagen等细胞外基质成分的表达,酸性磷酸酶法检测SCs的黏附能力。结果:E17大鼠坐骨神经SCs有LN阳性免疫反应;经过外源性LN处理后,SCs有LN、nidogen、type IV collagen阳性免疫反应,且黏附能力增加。结论:在E17大鼠中,SCs开始分泌LN;LN具有促进SCs合成细胞外基质成分,并在其黏附过程中发挥作用。     

检测层黏连蛋白双mAb夹心ELISA的建立

慢性肝病通常发展为肝纤维化，常规实验室检查对肝纤维化的诊断几乎毫无参考价值。肝组织活检对肝纤维化诊断是金标准，但因其具有创伤性，很难作为临床常规检查和动态观察。最近十几年来许多研究者致力于慢性肝病的血清学研究，希望能找到良好的无创伤性血清学指标来替代肝组织活检。血清层黏连蛋白(laminin，LN)的水平与肝纤维化的程度密切相关，并可作为肝纤维化早期诊断指标之一。     

层黏连蛋白受体1单克隆抗体抑制博莱霉素诱导的大鼠肺纤维化

目的 研究层黏连蛋白受体1(LAMRl)单克隆抗体(mAb)干预博莱霉素诱导的大鼠肺纤维化.方法 雄性SD大鼠72只,随机分为LAMRl mAb组(L)、对照组(C)和模型组(M)3组,气管内滴入博莱霉素(5 mg/kg体质量)制备肺纤维化模型.3组分别给予LAMRl mAb、地塞米松、生理盐水3次/周,腹腔注射,于第7、14、28天处死8只大鼠.HE染色观察肺纤维化程度;免疫组化方法检测肺组织中表面活性物质A(SP-A)的含量;ELISA测定血清中羟脯氨酸(Hyp)的含量;PCR方法检测肺组织中基质金属蛋白酶9(MMP-9)及转化生长因子β1(TGF-β1) mRNA的含量.结果 各时间段,M组肺纤维化程度及Hyp含量均高于C组和L组,SP-A的含量均低于其余两组,M组肺组织的MMP-9和TGF-β1的mRNA的含量明显高于其余两组.结论 LAMRl mAb可明显减轻博莱霉素诱导的肺纤维化程度.     

低氧抑制猪肺动脉平滑肌细胞MMP-2和MMP-9的表达

目的探讨低氧对猪肺动脉平滑肌细胞（PASMC）分泌基质金属蛋白酶（MMPs）的影响。方法采用酶谱法测定PASMC培养基中MMP-2和MMP-9的酶活性，免疫印迹法检测培养基中MMP-2和MMP-9的蛋白表达，免疫组化法测定细胞原位MMP-2和MMP-9的蛋白表达，RT-PCR法检测mRNA的表达。结果低氧后PASMC分泌的MMP-2酶活性、细胞内外蛋白表达量、mRNA表达量均下降；MMP-9酶活性、细胞外蛋白表达量下降，而细胞内蛋白表达无变化。结论低氧可抑制PASMC分泌MMP-2和MMP-9的酶活性，其机制可能是低氧影响PASMC中MMP-2基因的转录、影响MMP-9蛋白表达后的分泌与活化，导致MMP-2和MMP-9酶活性的改变。     

前列腺间质细胞中雌二醇对MMP-2，MMP-9及其组织抑制因子表达的影响

目的： 研究雌二醇(E2)对前列腺间质细胞中基质金属蛋白酶(MMP-2、MMP-9）及其组织抑制因子1(TIMP-1)、TIMP-2和雌激素受体α、β（ERα、ERβ）的影响。方法： 实时定量PCR法检测E2在前列腺间质细胞中对MMP-2、MMP-9、TIMP-1、TIMP-2 mRNA水平的影响；半定量RT-PCR法检测E2对ERα、ERβ mRNA水平的影响。酶谱电泳法检测MMP-2、MMP-9的活性。Western blotting检测E2在前列腺间质细胞中对ERα蛋白水平的影响。结果： 前列腺间质细胞中有MMP-2和ERα mRNA的表达，未检测到MMP-9 mRNA；培养液中检测到MMP-2前体（pro-MMP-2），未检测到其活性形式，也未检测到MMP-9前体及其活性形式。用E2处理间质细胞后MMP-2 mRNA水平降低，pro-MMP-2蛋白量减少，雌激素受体抑制剂ICI 182.780可抑制此作用。E2对TIMP-1,2 mRNA表达无显著影响。E2能够增加前列腺间质细胞中ERα mRNA及其蛋白表达的水平。结论： E2能够通过ERα下调前列腺间质细胞中MMP-2的表达。     

层黏连蛋白和Ⅳ型胶原在小鼠肾发育中的表达

目的:观察层黏连蛋白(LN)和Ⅳ型胶原(CoⅣ)在小鼠肾发育中的时空性表达,探讨其与肾发育的关系.方法:采用免疫组织化学结合免疫印迹,检测不同胚龄及生后日龄小鼠肾组织LN和CoⅣ的表达及其含量变化.结果:LN在输尿管芽、各期肾小体、肾小管及集合管的基底膜处均有表达,并随肾的发育其表达量逐渐增加;CoⅣ在胚龄12 d时,在输尿管芽周围没有表达,以后,在各期肾小体、肾小管和集合管的基底膜处均有表达,随肾的发育其表达量逐渐增加.结论:推测LN和CoⅣ可能对小鼠肾发育以及成熟肾各结构的维持起重要作用.     

乙型肝炎病毒对HepG2细胞侵袭的影响

目的 研究HBV全长对HepG2细胞侵袭相关基因表达及活性的影响,探讨HBV在整体水平对HepG2细胞侵袭的影响.方法 采用定量PCR分析HBV对HepG2细胞MMP2、9和TIMP1-4基因转录的影响;通过明胶酶谱及反相明胶酶谱检测MMP2、MMP9及TIMPs的活性;应用体外侵袭小室法检测细胞的侵袭能力.结果 HBV的复制可以促进HepG2细胞MMP2、MMP9、TIMP1和TIMP3基因的转录,抑制TIMP4基因转录,增强HepG2细胞MMP2 、MMP9的活性并增强细胞中TIMP1、TIMP3功能,HBV稳定复制的细胞具有更强的体外侵袭能力.结论 HBV可影响HepG2细胞MMPs和TIMPs的基因转录、表达及功能,促进HepG2细胞的体外侵袭,这可能与HBV相关的HCC侵袭转移密切相关.     

Up-regulation of MMP-8 and MMP-9 activity in the BALB/c mouse spinal cord correlates with the severity of experimental autoimmune encephalomyelitis

Induction of EAE can be inhibited or repressed by administration of soluble metalloproteinase inhibitors. We studied the matrix metalloproteinase (MMP) and their tissue inhibitor (TIMP) expression pattern in experimental autoimmune encephalomyelitis (EAE) of the resistant Th2 prone BALB/c mouse, where the disease can be induced with ultrasound-emulsified antigen/adjuvant (son-ag), but not with conventional technique (syr-ag). We found highly elevated expression of MMP-8 (neutrophil collagenase) mRNA and protein in diseased son-ag challenged mice, colocalizing to neutrophil infiltrates found in brain and extensively in the spinal cord submeningeal space. MMP-8 expression has not been found previously in sensitive mouse strains. The infiltrates stained positive also for MMP-9 protein, and brain homogenates from corresponding mice showed MMP-9 activity during overt disease (days 12-16 post-immunization). TIMP-1 gene expression could be detected in CNS samples from diseased son-ag challenged mice but not in syr-ag or control mice, and the TIMP-1 protein colocalized with GFAP-staining. In contrast, in syr-ag mice both TIMP-2 and TIMP-3 gene expression in the spinal cords was elevated. The results show that sonication, but not extrusion, creates an adjuvant formula potent in activating the matrix metalloproteinase cascade similar to sensitive mouse strains, strongly implicating their role in EAE induction in this Th2 prone strain. The study provides the basis for establishment of MMP-specific therapy in this model.     

垂体腺瘤中MMP-9及TIMP-1表达与肿瘤生物学行为的关系

目的　探讨MMP 9及其抑制因子TIMP 1在垂体腺瘤中表达与肿瘤生物学行为的关系。方法　应用免疫组化S P法检测上述基因蛋白在 2 3例侵袭性和 2 4例非侵袭性垂体腺瘤组织中的表达。结果　侵袭性垂体腺瘤组中MMP 9的表达和MMP 9表达超过TIMP 1的比例高于非侵袭性腺瘤组 (P <0 0 5 ) ;TIMP 1在侵袭性垂体腺瘤组的表达有降低的趋势 ,但无统计学意义 (P >0 0 5 ) ;MMP 9与TIMP 1表达呈正相关 (P <0 0 5 )。结论　MMP 9表达上调导致其和TIMP 1的表达失衡与垂体腺瘤侵袭性有关 ,MMP 9可作为评估垂体腺瘤侵袭性的分子生物学指标     

牛蒡苷元通过调节 MMP-2，MMP-9表达抑制增生性瘢痕的形成

目的：观察牛蒡苷元对增生性瘢痕(hypertrophic scar)形成的作用,并探讨其抑制增生性瘢痕形成的机制。方法新西兰大耳兔25只,将其分为对照组( A 组),模型组(B 组),牛蒡苷元治疗组(0.5 mg/ ml)(C 组),牛蒡苷元治疗组(2 mg/ ml)(D 组),牛蒡苷元治疗组(6 mg/ ml)(E 组),在兔耳腹侧面建立增生性瘢痕模型,术后按组别进行相应处理,观察创面愈合和瘢痕的增生情况。用药后在第6周取材,进行 HE 染色,天狼猩红染色和 Masson 染色,并用 Western 印迹检测 MMP-2, MMP-9表达情况。结果 HE 染色,天狼星红染色和 Masson 染色结果表明,牛蒡苷元治疗组(2 mg/ ml)可以明显抑制增生性瘢痕的形成。与模型组相比,牛蒡苷元治疗组的瘢痕较平坦,成纤维细胞的数量减少,胶原的密度降低。并且 Western 印迹的结果表明,牛蒡苷元治疗组(2 mg/ ml)能够使 MMP-2, MMP-9表达降低。结论牛蒡苷元能有效抑制增生性瘢痕的发展,其机制可能是通过下调 MMP-2和 MMP-9的表达。牛蒡苷元可能具有治疗增生性瘢痕的作用。     

Matrix Metalloproteinases and Tissue Inhibitors of Metalloproteinases in Pituitary Adenomas: Possible Markers of Neuroendocrine Cells

Matrix metalloproteinases (MMPs) are involved in remodeling processes and have been immunocytochemically localized in some endocrine glands and their tumors. Using anterior pituitary gland and pituitary adenomas, immunocytochemical localization of MMP-2 (gelatinase-A),-9 (gelatinase-B), tissue inhibitor of metalloproteinase (TIMP)-1 and-2 was performed. Normal anterior-pituitary cells all contain MMPs and lesser amount of TIMPs, whereas far fewer MMPs and TIMPs are identified in anterior pituitary adenomas. There is no correlation between pituitary hormone and MMPs-TIMPs localization, thus MMP-TIMP homeostasis may not be involved in hormone synthesis and secretion of anterior pituitary cells and their adenomas. Because MMPs and TIMPs are more abundantly and specifically localized in pituitary cells and their adenomas, MMPs and TIMPs may be included as markers for endocrine cells, including anterior-pituitary cells.     

基质金属蛋白酶-9及其组织抑制物-1在妊娠输卵管黏膜中的表达

目的:检测基质金属蛋白酶-9(MMP-9)及其组织抑制物-1(TIMP-1)在输卵管黏膜中的表达,探讨与输卵管妊娠的关系。方法:采用免疫组织化学显色技术和图像半定量分析法,检测MMP-9和TIMP-1在人妊娠输卵管黏膜、人正常输卵管黏膜及正常宫内早孕子宫蜕膜组织中的表达。结果:MMP-9和TIMP-1在正常宫内早孕组中表达最强,在输卵管妊娠组中的表达较强,在正常输卵管组中表达较弱。两两比较差异均有显著性。结论:MMP-9/TIMP-1参与了输卵管妊娠中胚胎着床过程,且与输卵管妊娠缺乏蜕膜化反应有关。     

Vascular smooth muscle cells and pericytes express MMP-1, MMP-9, TIMP-1 and type I procollagen in inflammatory bowel disease

AIMS: Matrix metalloproteinases (MMPs) are involved in tissue remodelling, which is one of the important aspects of inflammatory disease. To assess the balance between the matrix degradation and production, we analysed the in situ expression of MMP-1, -3, -8 and -9, tissue inhibitor of metalloproteinases (TIMP)-1 and -2, and type I procollagen (PC-I) in inflammatory bowel disease. Methods and results: Immunohistochemistry using frozen sections was performed in 17 patients with ulcerative colitis (UC) and 16 with Crohn's disease (CD). In both UC and CD, MMPs and TIMPs were expressed by inflammatory cells as well as by fibroblastic cells most prominently in actively inflamed areas in ulcer bases, but sparsely in intact inflamed mucosa in both UC and CD. In UC, inflamed mucosa with erosions expressed these substances focally. Fibroblasts also expressed PC-I. We identified that vascular smooth muscle cells of venules in ulcer bases expressed MMP-1 and -9, TIMP-1 and PC-I. These venules also expressed E-selectin, a cell adhesion molecule to facilitate the leucocyte extravasation, and vascular endothelial growth factor (VEGF) receptor 2, consistent with their property of newly formed vessels. CONCLUSIONS: Our results suggest that MMPs are involved in the tissue remodelling, angiogenesis and promotion of leucocyte extravasation in the actively inflamed area in the ulcer base in both UC and CD. MMP-1 expression in the mucosa may be related to the initial step of ulceration in UC. Therapeutic manipulation of extracellular matrix turnover would be an effective therapy to alleviate active inflammation and accelerate ulcer healing.     

The role of matrilysin (MMP-7) in leukaemia cell invasion

The matrix metalloproteinases (MMPs) are important in tumour cell invasion and metastasis in many common cancers. However, relatively few studies have investigated the role of MMPs and their inhibitors, the tissue inhibitors of metalloproteinases (TIMPs), in leukaemia cell invasion. This study examined two leukaemia cell lines, K562 and HL-60 and showed that the K562 cell line was four times more invasive than the HL-60 cell line. The expression of MMP-2, matrilysin (MMP-7), MMP-9, TIMP-1, TIMP-2 and TIMP-3 was analysed. Both cell lines produced similar amounts of MMP-2, MMP-9 and TIMP-2. The K562 cells expressed more TIMP-1 than the HL-60 cells and neither cell line expressed TIMP-3. Interestingly, only the K562 cells expressed matrilysin suggesting a potential role for matrilysin in leukaemia cell invasion. In vitro invasion assays performed in the presence of a matrilysin blocking antibody showed a 40% reduction in invasive ability. This data suggests that matrilysin plays an important role in leukaemia cell invasion. This revised version was published online in July 2006 with corrections to the Cover Date.