Thesis (Ph.D.). / Title from title page of PDF (viewed 2008/01/30). Written for the Dept. of Medicine, Division of Experimental Medicine. Includes bibliographical references.

Thesis (M.S.)--University of Tennessee Health Science Center, 2009. / Title from title page screen (viewed on August 5, 2009). Research advisor: David A. Tipton, D.D.S., Ph.D. Document formatted into pages (vi, 39 p. : ill.). Vita. Abstract. Includes bibliographical references (p. 27-38).

Abstract The invasion of a tumour through tissue limiting basement membranes is the critical step in malignant growth. Gelatinases (MMP-2 and MMP-9) are endopeptidases capable of degrading extracellular and pericellular matrix proteins such as collagen IV, the major component of basement membranes. An over-expression of these gelatinases is generally found in malignant tumours and is linked to impaired prognosis in many cancer types. Tissue inhibitors of metalloproteinases (TIMPs), endogenous regulators of the MMP activity, have recently been introduced as multifunctional proteins, which have paradoxical roles in tumour growth. Little data exists on the clinical significance of the gelatinases and TIMPs in gynaecological cancers. In this study the clinical significance of the gelatinases was studied in endometrial and uterine cervical cancers by using immunohistochemical staining with specific antibodies. In epithelial ovarian cancer (EOC) these enzymes and their TIMPs were studied in the preoperative serum samples using ELISA assay. Additionally, sequential serum measurements were performed during chemotherapy to evaluate them as treatment response indicators. In endometrial cancer, MMP-9 positivity correlated to a poor histological differentiation and an advanced clinical stage. High MMP-2 expression correlated to a poor differentiation, and unfavourable survival in stage I cancers, with mortality rates of 5% and 19% in patients with MMP-2 negative versus intensively MMP-2 positive tumours, respectively. In cervical cancers high MMP-2 expression correlated to an increased mortality risk. High MMP-9 expression was connected to a good differentiation of a tumour. In EOC, a high circulating TIMP-1 value correlated to all the examined aggressive features of EOC, including poor survival. The serum measurements of TIMP-1 were uninformative about response evaluation during chemotherapy but paradoxically, an increase in gelatinases and TIMP-2 seemed to reflect a good response to treatment. In conclusion, the data from this study show that high MMP-2 expression in tumour tissue could be prognostic in endometrial and cervical cancer, and preoperative circulating TIMP-1 could serve as an additional prognostic marker in EOC. Studies with larger patient cohorts would be necessary to further explore the value of these enzymes in clinical practice in gynaecological cancers.

Abstract Lymphomas are a heterogeneous group of malignancies, which usually have a good prognosis and high cure rates. Lymphomas are sensitive to chemotherapy and radiotherapy, and many patients can be cured even after a relapse, resulting in a need for effective follow-up. However, the cost-benefit ratio of radiological imaging in predicting the forthcoming relapses is poor. Consequently, there is a need for biological prognostic and predictive markers to distinguish patients at the highest risk of relapse at the time of diagnosis or during follow-up. Despite rapid progress in lymphoma treatments, some patients still die from lymphoma. Thus, more data on the basic biological features of lymphomas are also needed. Gelatinases (MMP-2 and MMP-9) and their tissue inhibitors (TIMP-1 and TIMP-2) have been found to play a role in the progression of solid tumours. TP53 is a tumour suppressor gene, the mutations and protein over-expression of which have been demonstrated to be associated with survival in most cancer types. There is also some evidence that these proteins could have prognostic significance in lymphomas as well. In the present study, the tissue expression, plasma concentrations and clinical value of gelatinases and their tissue inhibitors were evaluated in lymphomas. 249 primary tissue samples from patients with Hodgkin, follicular, or diffuse large B-cell lymphoma were analysed for expression of gelatinases and/or their inhibitors using immunohistochemistry. In follicular lymphoma, p53 protein expression was also investigated. The plasma samples of 126 lymphoma patients and a control group of 44 healthy volunteers were collected and studied by ELISA. TIMP-1 expression correlated with bulky tumour and nodular sclerosis subtype of Hodgkin lymphoma. In follicular lymphoma, p53 over-expression was an independent adverse prognostic factor for survival and a predictor of histological transformation. Plasma MMP-2-TIMP-2 complex appeared to be a potential follow-up marker predicting the risk of relapse in lymphoma patients. Plasma levels of the MMP-2-TIMP-2 complex, proMMP-2, TIMP-2 and proMMP-2/TIMP-2 ratio were at abnormal levels both in patients with newly diagnosed lymphoma and those in remission compared to healthy controls. The clinical significance of these markers needs further studies.

冠狀動脈旁路移植術是治療合併左主幹及多隻冠狀動脈狹窄性病變患者的理想方法。然而靜脈橋失效極大地限制了冠脈搭橋手術的遠期療效。基於對靜脈橋失效潛在機制的研究，近年來開發出了多種針對性的防治手段。但是除了積極的降脂治療，目前尚未有其它療法獲得臨床證實可以有效改善靜脈橋遠期通暢率。所以，本研究旨在探索與防治靜脈橋再狹窄相關的新型生物標靶和防治策略。 / 我們應用豬大隱靜脈植入頸內動脈模型，觀察骨橋蛋白是否參與靜脈橋動脈化進程以及其與基質金屬蛋白酶功能活動的關係。我們發現骨橋蛋白表達在靜脈橋動脈化過程中顯著增加，並且與基質金屬蛋白酶2/9和增殖細胞數量的變化同步。此外，骨橋蛋白富集區域在靜脈橋內的再分佈與血管壁重構進程相關。這些結果表明, 骨橋蛋白積極參與了靜脈橋壁重構，而抑制骨橋蛋白表達作為防治靜脈橋失效的治療策略值得深入研究。 / 我們運用體外培養的方法研究了在高糖環境中骨成形蛋白4與靜脈內皮細胞舒張功能障礙的關係。我們發現，骨成形蛋白4在糖尿病患者的大隱靜脈與高糖培養的人臍靜脈內皮細胞中顯著增加；而骨成形蛋白4的高表達與靜脈血管內皮細胞依賴性舒張功能受損有關。本研究結果為解釋糖尿病患者有著較高的冠脈搭橋術後靜脈橋失效率提供了新證據，同時也為改善此類患者靜脈橋通暢率提出了潛在的治療靶點。 / 通過轉染金屬蛋白酶-3抑制物 (TIMP-3)基因來針對性地抑制血管中層平滑肌細胞的遷移和增殖，可以有效地減少靜脈橋新生內膜增生。基於前期研究，我們觀察了在豬模型中運用重組腺病毒轉載TIMP-3(RAdTIMP-3) 防治靜脈橋狹窄的遠期效果(3個月)。結果發現，即使在腺病毒載體已被清除的情況下，RAdTIMP-3對靜脈橋的良性保護作用仍持續存在。此外，我們通過比較術後7天與3個月獲取的橋血管中炎性標記物表達的差異，發現腺病毒轉染並未對靜脈橋造成長期的炎性損害。因此，我們認為RAd-TIMP3基因能夠安全有效地防治靜脈橋遠期狹窄。本研究結果為TIMP-3基因治療轉化至臨床實踐提供了可靠的前期證據。 / Coronary artery bypass grafting (CABG) remains the “gold standard“ for treating high-risk patients with unprotected left-main or multi-vessel coronary lesions. However, the long-term success of CABG is largely limited by an inadequate patency of saphenous vein grafts. To date, various therapeutic strategies targeting at the underlying mechanisms involved in the pathogenesis of vein graft failure (VGF) have been proposed and tested. However, apart from lipid-lowering therapy, no other intervention appears to have sustained benefits on improving vein graft patency in the clinical setting. Therefore, the aim of this study is to explore novel sets of molecular targets and effective therapeutic strategies to prevent VGF. / Novel molecules involved in the pathogenesis of vein graft failure / Using a porcine model, we assessed the involvement of osteopontin (OPN) in the venous arterialization and its relationship with the matrix metalloproteinases (MMPs). We found that the expression of OPN was significantly increased over the 3-month study period. Moreover, the expression of OPN at different time points well correlated with the fluctuating activities of MMP-2/9 and the number of proliferative cells. We also observed a time-dependent redistribution of OPN protein accumulating in different layers of the venous wall. These findings suggest a contributory role of OPN protein involved in the process of vein graft wall remodeling. / We used pig and human saphenous veins (SVs), as well as human umbilical endothelial cells (HUVECs), to investigate the changes of bone morphogenic protein-4 (BMP4) expression and its effects on endothelium-dependent relaxations (EDRs) under hyperglycemic conditions. Our results demonstrated a marked increase of BMP4 expression in SVs from diabetic patients and in HUVECs cultured with hyperglycemic medium. Moreover, such an increase of BMP4 contributes significantly to the impaired EDRs in venous conduits. Our findings add novel evidence that helps explain the high prevalence of VGF in diabetic patients undergoing CABG, and also suggest BMP4 as a potential therapeutic target to improve vein graft patency in this population. / Novel Therapeutic Strategy -- Gene Therapy / Aiming at blocking the development of neointima formation caused by vascular smooth muscle cells migration and proliferation, genetic transfection of tissue inhibitor of metalloproteinases-3 (TIMP-3) to vein grafts has shown promising results. Based on our previous study, we used recombinant adenoviruses that carry TIMP-3 (RAdTIMP-3) as a therapeutic gene to evaluate its long-term (3 months) effects on the pathological vein graft wall thickening in vivo. We found that the RAdTIMP-3-treated vein grafts had significantly reduced intimal and medial thickness compared with grafts from the control groups at 3 months, even after adenoviruses had already been cleared from transduced tissue. Furthermore, by assessing the amount of macrophages and the level of three inflammatory biomarkers within grafts harvested at 7 days and 3 months after implantation, we did not observe any detrimental effects of adenoviral transfection on the inflammatory status within the vein grafts. We therefore concluded that overexpression of TIMP-3 could effectively inhibit vein graft wall over-thickening in the longer-term. Our findings suggested the ex vivo RAdTIMP-3 gene therapy an attractive candidate for future clinical translation. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Hu, Jia. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2012. / Includes bibliographical references (leaves 109-143). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese. / Abstract --- p.i / Declaration --- p.vii / Acknowledgement --- p.viii / Table of Contents --- p.x / List of Abbreviations --- p.xvi / List of Figures/Tables --- p.xviii / Chapter Chapter I --- INTRODUCTION --- p.1 / Chapter 1.1 --- SAPHENOUS VEIN GRAFTS IN CORONARY REVASCULARIZATION --- p.3 / Chapter 1.1.1 --- The use of venous conduits in CABG --- p.3 / Chapter 1.1.2 --- The long-term patency of saphenous vein grafts --- p.4 / Chapter 1.1.3 --- PCI for vein graft diseases --- p.6 / Chapter 1.1.4 --- Vein graft failure and adverse clinical outcomes --- p.7 / Chapter 1.2 --- MORPHOLOGY AND PHYSIOLOGY OF A NORMAL SAPHENOUS VEIN --- p.8 / Chapter 1.3 --- THE PATHOPHYSIOLOGY OF VEIN GRAFT FAILURE --- p.10 / Chapter 1.3.1 --- The quality of vein grafts prior to grafting --- p.10 / Chapter 1.3.1.1 --- Pre-existing endothelial dysfunction --- p.10 / Chapter 1.3.1.2 --- Surgical injuries --- p.11 / Chapter 1.3.2 --- Mechanisms of the pathological vein graft wall thickening --- p.12 / Chapter 1.3.2.1 --- Platelet activation and coagulant cascade --- p.13 / Chapter 1.3.2.2 --- Leukocytes recruitment and inflammation --- p.13 / Chapter 1.3.2.3 --- Hemodynamic forces --- p.14 / Chapter 1.3.2.4 --- Growth factors and VSMCs activation --- p.15 / Chapter 1.3.2.5 --- Contribution of adventitial and graft-extrinsic cells --- p.16 / Chapter 1.3.2.6 --- Oxidative stress --- p.17 / Chapter 1.3.2.7 --- Concomitant risk factors and vein graft atherosclerosis --- p.17 / Chapter 1.4 --- STRATEGIES FOR THE PREVENTION OF VEIN GRAFT FAILUR --- p.18 / Chapter 1.4.1 --- Minimizing surgical injuries --- p.18 / Chapter 1.4.2 --- Pharmacologic interventions --- p.19 / Chapter 1.4.3 --- External supports --- p.21 / Chapter 1.4.4 --- Genetic engineering of the vein graft --- p.23 / Chapter 1.4.4.1 --- Delivery systems --- p.23 / Chapter 1.4.4.2 --- Therapeutic strategies of the genetic modulation --- p.25 / Chapter 1.4.4.2.1 --- Antithrombotic and anticoagulant strategies --- p.25 / Chapter 1.4.4.2.2 --- Therapies for endothelial protection and regeneration --- p.27 / Chapter 1.4.4.2.3 --- Reducing inflammation and atherosclerosis --- p.28 / Chapter 1.4.4.2.4 --- Antioxidative therapy --- p.29 / Chapter 1.4.4.2.5 --- Therapies targeting at the cellular proliferation --- p.29 / Chapter 1.4.4.2.6 --- Inhibiting extracellular matrix reorganization --- p.31 / Chapter 1.5 --- CONCLUSIONS --- p.32 / Chapter Chapter II --- MATERIALS AND METHODS --- p.34 / Chapter 2.1 --- MATERIALS --- p.35 / Chapter 2.1.1 --- Reagents and equipment --- p.35 / Chapter 2.1.1.1 --- General materials and equipment for animal model --- p.35 / Chapter 2.1.1.2 --- General reagents and equipment for western blot --- p.35 / Chapter 2.1.1.3 --- General reagents and equipment for immunohistochemistry --- p.36 / Chapter 2.1.1.4 --- General reagents and equipment for venous ECs functional studies --- p.37 / Chapter 2.1.2 --- Buffers --- p.37 / Chapter 2.1.2.1 --- Buffers for human and animal samples --- p.37 / Chapter 2.1.2.2 --- Buffers for western blot --- p.38 / Chapter 2.1.2.3 --- Immunohistochemistry buffers --- p.39 / Chapter 2.1.2 --- Antibodies and adenoviral vectors --- p.41 / Chapter 2.2 --- METHODS --- p.41 / Chapter 2.2.1 --- Animal model --- p.41 / Chapter 2.2.2 --- Functional studies --- p.44 / Chapter 2.2.3 --- Human endothelial cells culture --- p.44 / Chapter 2.2.4 --- Western blot analysis --- p.45 / Chapter 2.2.5 --- Immunochemistry and immunofluorescence --- p.46 / Chapter Chapter III --- ROLE OF BMP4 IN VENOUS ENDOTHELIAL DYSFUNCTION --- p.47 / Chapter 3.1 --- INTRODUCTION --- p.48 / Chapter 3.2 --- MATERIALS AND METHODS --- p.49 / Chapter 3.2.1 --- Patient characteristics --- p.49 / Chapter 3.2.2 --- Preparation of human vein segments --- p.51 / Chapter 3.2.3 --- Porcine saphenous veins culture --- p.51 / Chapter 3.2.4 --- Functional studies of vein segments --- p.52 / Chapter 3.2.5 --- Cell culture --- p.53 / Chapter 3.3.6 --- Western blot analysis of BMP4 --- p.53 / Chapter 3.3.7 --- ROS measurement by dihydroethidium fluorescence imaging --- p.54 / Chapter 3.2.8 --- Statistical analysis --- p.54 / Chapter 3.3 --- RESULTS --- p.54 / Chapter 3.3.1 --- ACh-induced EDRs are impaired in diabetic veins --- p.54 / Chapter 3.3.2 --- The expression of BMP4 is upregulated under hyperglycemic condition --- p.55 / Chapter 3.3.3 --- BMP4 induces venous endothelial dysfunction in diabetes --- p.56 / Chapter 3.3.4 --- BMP4 impairs EDRs in cultured porcine saphenous veins --- p.58 / Chapter 3.4 --- DISCUSSION --- p.59 / Chapter 3.5 --- CONCLUSIONS --- p.62 / Chapter Chapter IV --- ROLE OF OSTEOPONTIN IN VEIN GRAFT REMODELING --- p.63 / Chapter 4.1 --- INTRODUCTION --- p.64 / Chapter 4.2 --- MATERIALS AND METHODS --- p.66 / Chapter 4.2.1 --- Surgical procedures --- p.66 / Chapter 4.2.2 --- Immunohistochemistry --- p.67 / Chapter 4.2.3 --- Western blot --- p.68 / Chapter 4.2.4 --- Gelatin zymography --- p.69 / Chapter 4.2.5 --- Cell proliferation --- p.69 / Chapter 4.2.6 --- Statistical analysis --- p.69 / Chapter 4.3 --- RESULTS --- p.70 / Chapter 4.3.1 --- Expression and redistribution of OPN protein within the venous wall --- p.70 / Chapter 4.3.2 --- The fluctuating expression of the matrix metalloproteinases --- p.72 / Chapter 4.3.3 --- Vascular smooth muscle cells proliferation --- p.74 / Chapter 4.4 --- DISCUSSION --- p.75 / Chapter 4.5 --- CONCLUIONS --- p.79 / Chapter Chapter V --- TIMP-3 GENE THERAPY FOR NEOINTIMA FORMATION --- p.81 / Chapter 5.1 --- INTRODUCTION --- p.82 / Chapter 5.2 --- MATERIALS AND METHODS --- p.84 / Chapter 5.2.1 --- Materials --- p.84 / Chapter 5.2.2 --- Grafting of pig saphenous veins and adenoviral transfection --- p.84 / Chapter 5.2.3 --- Histologic and morphometric analysis of the vein graft --- p.87 / Chapter 5.2.4 --- Immunocytochemistry --- p.87 / Chapter 5.2.5 --- Data analysis and statistics --- p.88 / Chapter 5.3 --- RESULTS --- p.89 / Chapter 5.3.1 --- Histologic and morphometric analysis of the vein graft --- p.89 / Chapter 5.3.2 --- Overexpression of TIMP-3 in porcine interposition grafts --- p.91 / Chapter 5.3.3 --- Endothelial cell coverage and VSMCs content --- p.92 / Chapter 5.3.4 --- Inflammation in vein grafts --- p.92 / Chapter 5.4 --- DISCUSSION --- p.97 / Chapter Chapter VI --- SUMMARY AND DISCUSSION OF MAJOR FINDINGS --- p.103 / Chapter 6.1 --- SUMMARY AND DISCUSSION --- p.104 / Chapter 6.1.1 --- The role of BMP4 in the pathogenesis of venous endothelial dysfunction --- p.104 / Chapter 6.1.2 --- The involvement of osteopontin in the process of vein graft remodeling --- p.105 / Chapter 6.1.3 --- Sustained benefits of adenoviruses-mediated TIMP-3 gene transfer in reducing vein graft neointima formation --- p.106 / Chapter 6.1.4 --- The inflammatory responses induced by adenoviral transfection --- p.106 / Chapter 6.1.5 --- Perspectives: novel therapeutic targets and clinical translation --- p.107 / Chapter 6.2 --- CONCLUSIONS --- p.108 / REFERENCES --- p.109 / PUBLICATION LIST --- p.144

No description available.

Diss. (sammanfattning) Stockholm : Karol. inst., 2005. / Härtill 4 uppsatser.

Systemic inflammation is associated with impaired lung function. Inflammation is part of asthma and chronic obstructive pulmonary disease (COPD), but the local and systemic inflammatory pattern differs. The overall aim was to evaluate systemic inflammatory markers in obstructive lung diseases and more specifically: To determine if CRP is related to respiratory symptoms, asthma, atopy and bronchial responsiveness (paper I), in a population sample from three countries (paper I and II); to evaluate if CRP is related to COPD, lung function and rate of lung function decline (paper II); to investigate the association of serum MMP-9 and TIMP-1 with lung function in a cross-sectional population based study (paper III); and finally, to study possible gender differences in the longitudinal association between CRP and lung function in a prospective population based study (paper IV). In the first study we reported that CRP was related to non-allergic asthma but not allergic asthma, and that CRP was related to respiratory symptoms such as wheeze, nocturnal cough and breathlessness after effort, but not associated with atopy or bronchial responsiveness. In the second study we found that COPD was more common in subjects in the highest CRP quartiles and higher CRP levels were associated with lower FEV1 values in both men and women, but the negative association between CRP and FEV1 was larger in men than women. The FEV1 decline was larger in men with high CRP levels, whereas no such association was found for women. In the third study we reported that lower FEV1 was associated with higher levels of MMP-9, TIMP-1 and their ratio MMP-9/TIMP-1. After stratification for gender this association was significant in men but not women. In the fourth study we found that CRP levels were associated with change in both FEV1 and FVC in men but not women. This association was found for both baseline CRP and change in CRP, confirming a stronger association between systemic inflammation and lung function decline in men than women. In conclusion, systemic inflammation is associated with non-allergic asthma but not allergic asthma. Our findings of a stronger association between the systemic inflammation and lung function impairment in men, but not women, may indicate a gender difference in the mechanisms of lung function decline.

Thesis (Ph. D.)--University of Oklahoma. / Bibliography: leaves 164-207.

CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / O cÃncer colorretal(CCR) à altamente prevalente nos paÃses mais ricos e industrializados. As metaloproteinases de matriz (MMPs) sÃo importantes enzimas que facilitam a invasÃo e disseminaÃÃo do tumor em vÃrios tipos de cÃncer, inclusive o colorretal. Os inibidores teciduais de metaloproteinases (TIMPs) sÃo os principais inativadores fisiolÃgicos destas enzimas. Este estudo avaliou a expressÃo de metaloproteinase-2 (MMP-2), metaloproteinase-14 (MMP-14) e inibidor tecidual de metaloproteinases-2 (TIMP-2) no cÃncer colorretal. O imunomarcador CD68 foi utilizado para caracterizar a natureza das cÃlulas mononucleadas do estroma. Amostras teciduais de 50 casos de colectomias, devido ao cÃncer colorretal no perÃodo de 2004 a 2010, obtidas dos arquivos do Departamento de Patologia e Medicina Legal (DPML), Faculdade de Medicina da Universidade Federal do Cearà (UFC), foram analisadas. Realizou-se tissue microarrays e a seguir imuno-histoquÃmica para avaliar a expressÃo de MMP-2, MMP-14 e TIMP-2 de acordo com os seguintes escores baseados em outros relatos: 0= sem imunomarcaÃÃo ou raras cÃlulas marcadas (<5%); 1 = discreta marcaÃÃo na maioria (> 50%) das cÃlulas tumorais ou cÃlulas mononucleares do estroma, ou moderada marcaÃÃo em uma minoria de cÃlulas (<50 %); 2 =marcaÃÃo moderada na maioria (> 50%) de cÃlulas tumorais ou cÃlulas mononucleares ou intensa marcaÃÃo em minoria de cÃlulas (<50%); 3 = marcaÃÃo intensa na maioria (> 50%) de cÃlulas tumorais ou cÃlulas mononucleares. Observou-se relaÃÃo entre a expressÃo aumentada de MMP-14 em mononucleares de tumor primÃrio e casos sem metÃstases linfonodais (MMP-14, escores 2 e 3/N0 : 23/24 = 95%; N1-N3: 14/20 = 70%, p = 0,0353). No entanto, nenhuma relaÃÃo significativa foi encontrada entre a expressÃo de MMP-14, MMP-2 e TIMP-2 nos tumores primÃrios em cÃlulas cancerosas ou mononucleares e outros parÃmetros clÃnico-patolÃgicos. A imunoexpressÃo de MMP-2 foi negativa nas cÃlulas neoplÃsicas, em tumores primÃrios (47/47=100%) e metastÃticos (12/12 = 100%). A imunorreatividade de MMP-14 em cÃlulas neoplÃsicas foi frequentemente positiva em tumores primÃrios (50/50 = 100%) e metastÃticos (7/8= 88%). Em mononucleares, a maioria dos quais macrÃfagos (corados pelo CD68), a expressÃo positiva de MMP-14 tambÃm predominou marcadamente, tanto em tumores primÃrios (46/47 = 98%) como em carcinomas metastÃticos (9/10 = 90%). A expressÃo de TIMP-2 em cÃlulas neoplÃsicas, discreta, ocorreu em 70% de tumores primÃrios (35/50 casos) e 100% dos metastÃticos (8/8). A imunocoloraÃÃo para TIMP-2 em macrÃfagos associados ao tumor (TAMs) foi ainda mais elevada do que nas cÃlulas neoplÃsicas. Em conclusÃo, a MMP-14 e TIMP-2 sÃo frequentemente expressas em carcinomas colo-retais em ambas localizaÃÃes anatÃmicas, principalmente nas metÃstases para linfonodos , sugerindo que estas proteases desempenham papel importante na invasÃo local e na progressÃo tumoral neste tipo de cÃncer. A predominÃncia destes marcadores nas cÃlulas mononucleares (sobretudo macrÃfagos) , claramente evidentes na positividade para a MMP-2, enfatiza a importÃncia do microambiente tumoral no desenvolvimento de neoplasias. / The colorectal cancer (RCC) is highly prevalent in richer and industrialized countries. The matrix metalloproteinases (MMPs) are regarded as important for facilitating tumor invasion and spread in various cancers, including colorectal. Tissue inhibitors of metalloproteinases (TIMPs) are the major physiological inhibitors of MMPs. The expression of metalloproteinase-2 (MMP-2), metalloproteinase 14 (MMP-14) and tissue inhibitor of metalloproteinases-2 ( TIMP-2) in colorectal cancer was assessed. CD68 immunostaininig was utilized to the characterization of mononuclear cells nature. Paraffin-embedded tissues from patients undergoing colectomy for colorectal cancer in the period 2004 to 2010, were selected from the files of the Department of Pathology and Forensic Medicine (DPML), Medical School , Federal University of Cearà (UFC). Tissue microarrays were performed and slides were obtained for immunohistochemical detection of the expression of MMP-2, MMP-14 and TIMP-2 and the tissue samples analyzed. The following scores were applied: 0 = no immunostaining or rare labeled cells (<5%), 1 = slight marking the majority (> 50%) of tumor cells or stromal mononuclear cells, or moderate marking in a minority of cells (<50%) 2 = moderate labeling in the majority (> 50%) of tumor or mononuclear cells or intense marking in the minority of cells (<50%) and 3 = intense labeling in the majority (> 50%) of tumor cells or mononuclear cells. In this study, the relationship between increased expression of MMP-14 in mononuclear primary tumor cells and cases without lymph node metastases (MMP-14, 2 and 3/N0 scores: 23/26 = 88%; N1-N3: 14/21 = 67%, p = 0.0353) was stablished . However, no significant relationship was found between the immunohistochemical expression of MMP-14, MMP-2 and TIMP-2 in primary tumors in cancer cells and mononuclear cells and other clinico-pathological parameters. The expression of MMP-2 were negative in the neoplastic cells both in primary tumors (47/47 = 100%) and in metastatic ones (12/12 = 100%). The immunoreactivity of MMP-14 in neoplastic cells in primary tumors was positive (50/50 = 100%) and in all cases except one of metastatic carcinoma (7/8 = 88%). In mononuclear cells, most of them characterized as macrophages (CD68 stained), MMP-14 positive expression also predominated markedly, both in primary tumors (46/47 = 98%) and in metastatic carcinomas (9/10 = 90%). TIMP-2 expression in neoplastic cells of primary tumors occurred in 35/50 cases (70%) and lymph nodes showed positive immunostaining in all cases (8/8 = 100%). In both sites there were no cases with high expression. The TIMP-2 immunoreactivity in tumour associated macrophages (TAMs) was even higher than in the neoplastic cells. In conclusion, MMP-14 and TIMP-2 are frequently expressed in colorectal carcinomas in both anatomical sites , mainly in lymph node metastasis, suggesting that these proteases play an important role in local invasion and tumor progression of these cancers. The predominance of these biomarkers in mononuclear cells, clearly evident in the positivity for MMP-2, emphasizes the importance of tumor microenvironment in the development of neoplasms.