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The importance of dietary control in the development of a peanut allergy model in Brown Norway rats

de Jonge, J.D. (author), Knippels, L.M.J. (author), Ezendam, J. (author), Odink, J. (author), Penninks, A.H. (author), van Loveren, H. (author), TNO Kwaliteit van Leven (author)

This report describes the further development of a peanut allergy model in Brown Norway (BN) rats and in particular the importance of allergen-free breeding of the laboratory animals for the allergen to be used. For this purpose BN rats were bred for 3 generations on soy- and peanut-free feed since it is known that the legumes peanut and soy are...

article 2007

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Bis(tributyltin)oxide (TBTO) decreases the food allergic response against peanut and ovalbumin in Brown Norway rats

de Jonge, J.D. (author), Ezendam, J. (author), Knippels, L.M.J. (author), Odink, J. (author), Pourier, M.S. (author), Penninks, A.H. (author), Pieters, R. (author), van Loveren, H. (author), TNO Kwaliteit van Leven (author)

Other factors than the allergen itself may be of importance in the development of food allergy. This report describes the influence of the immunosuppressive compound bis(tributyltin)oxide (TBTO), present in the food chain, on the development of food allergy to peanut or ovalbumin in Brown Norway (BN) rats. To study these effects BN rats were...

article 2007

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Gingival tissue and crevicular fluid co-operation in adult periodontitis

Beklen, A. (author), Tüter, G. (author), Sorsa, T. (author), Hanemaaijer, R. (author), Virtanen, I. (author), Tervahartiala, T. (author), Konttinen, Y.T. (author)

Activated matrix metalloproteinase-3 (MMP-3) can contribute to periodontal ligament destruction in adult periodontitis. Since MMP-3 has been reported to activate proMMP-8 and -9, it was speculated that gingival tissue fibroblast-derived MMP-3 might, in periodontitis, be responsible for activation of gingival crevicular fluid (GCF) neutrophil...

article 2006

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Cathepsin K is the principal protease in giant cell tumor of bone

Lindeman, J.H.N. (author), Hanemaaijer, R. (author), Mulder, A. (author), Dijkstra, P.D.S. (author), Szuhai, K. (author), Bromme, D. (author), Verheijen, J.H. (author), Hogendoorn, P.C.W. (author)

Giant cell tumor (GCT) of bone is a neoplasm of bone characterized by a localized osteolytic lesion. The nature of GCT is an enigma and the cell type(s) and protease(s) responsible for the extensive localized clinicoradiological osteolysis remain unresolved. We evaluated protease expression and cellular distribution of the proteolytic machinery...

article 2004

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Involvement of Membrane-Type Matrix Metalloproteinases (MT-MMPs) in capillary tube formation by human endometrial microvascular endothelial Cells: Role of MT3-MMP

Plaisier, M. (author), Kapiteijn, K. (author), Koolwijk, P. (author), Fijten, C. (author), Hanemaaijer, R. (author), Grimbergen, J.M. (author), Mulder-Stapel, A. (author), Quax, P.H.A. (author), Helmerhorst, F.M. (author), van Hinsbergh, V.W.M. (author), Gaubius Instituut TNO (author)

In the endometrium, angiogenesis is a physiological process, whereas in most adult tissues neovascularization is initiated only during tissue repair or pathological conditions. Pericellular proteolysis plays an important role in angiogenesis being required for endothelial cell migration, invasion, and tube formation. We studied the expression of...

article 2004

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MMP profile in paired serum and synovial fluid samples of patients with rheumatoid arthritis

Gaubius Instituut TNO (author), Tchetverikov, I. (author), Ronday, H.K. (author), van El, B. (author), Kiers, G.H. (author), Verzijl, N. (author), TeKoppele, J.M. (author), Huizinga, T.W.J. (author), de Groot, J. (author), Hanemaaijer, R. (author)

Objective: To analyse matrix metalloproteinases (MMPs) and tissue inhibitor-1 of MMPs (TIMP-1) levels in the systemic circulation and synovial fluid (SF) of patients with RA and to compare these levels with inflammatory and collagen degradation markers. Methods: ProMMP-1, -2, -3, -8, -9, TIMP-1, levels of MMP/ α2-macroglobulin complexes, and...

article 2004

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Membrane-type matrix metalloproteinase-mediated angiogenesis in a fibrin-collagen matrix

Collen, A. (author), Hanemaaijer, R. (author), Lupu, F. (author), Quax, P.H.A. (author), van Lent, N. (author), Grimbergen, J. (author), Peters, E. (author), Koolwijk, P. (author), van Hinsbergh, V.W.M. (author), Gaubius Instituut TNO (author)

Adult angiogenesis, associated with pathologic conditions, is often accompanied by the formation of a fibrinous exudate. This temporary matrix consists mainly of fibrin but is intermingled with plasma proteins and collagen fibers. The formation of capillary structures in a fibrinous matrix in vivo was mimicked by an in vitro model, in which...

article 2003

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Inhibition of matrix metalloproteinase-14 in osteosarcoma cells by clodronate

Heikkilä, P. (author), Teronen, O. (author), Hirn, M.Y. (author), Sorsa, T. (author), Tervahartiala, T. (author), Salo, T. (author), Konttinen, Y.T. (author), Halttunen, T. (author), Moilanen, M. (author), Hanemaaijer, R. (author), Laitinen, M. (author)

Background. Bisphosphonates reduce the bone metastasis formation and angiogenesis but the exact molecular mechanisms involved are unclear. Progelatinase A (proMMP-2; 78 KDa) is activated up during the tumor spread and metastasis by a cell surface-associated matrix metalloproteinase (membrane-type matrix metalloproteinase [MT1-MMP] or MMP-14)....

article 2003

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Proteolysis of the urokinase-type plasminogen activator receptor by metalloproteinase-12: Implication for angiogenesis in fibrin matrices

Koolwijk, P. (author), Sidenius, N. (author), Peters, E. (author), Sier, C.F.M. (author), Hanemaaijer, R. (author), Blasi, F. (author), van Hinsbergh, V.W.M. (author), Gaubius Instituut TNO (author)

Pericellular proteolysis plays an important role in cell migration and the formation of new capillary structures. The plasminogen activator/plasmin and matrix degrading metalloproteinase (MMP) cascades act together in the remodeling of matrix and cell-matrix contacts. Previously we have shown that the formation of capillary structures by human...

article 2001

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Metalloproteinase inhibition reduces constrictive arterial remodeling after balloon angioplasty: A study in the atherosclerotic Yucatan micropig

de Smet, B.J.G.L. (author), de Kleijn, D. (author), Hanemaaijer, R. (author), Verheijen, J.H. (author), Robertus, L. (author), van der Helm, Y.J.M. (author), Borst, C. (author), Post, M.J. (author), Gaubius Instituut TNO (author)

Background - Arterial remodeling after balloon angioplasty has been recognized as a major determinant of restenosis. Perturbation of collagen metabolism might be important. After balloon injury, matrix metalloproteinase (MMP) expression is upregulated. We investigated the effect of Batimastat, a nonspecific MMP inhibitor, on late lumen loss,...

article 2000

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Fluorogenic MMP activity assay for plasma including MMPs complexed to α2-macroglobulin

Beekman, B. (author), Drijfhout, J.W. (author), Ronday, H.K. (author), TeKoppele, J.M. (author), Gaubius instituut TNO (author)

Elevated MMP activities are implicated in tissue degradation in, e.g., arthritis and cancer. The present study was designed to measure MMP enzyme activity in plasma. Free active MMP is unlikely to be present in plasma: upon entering the circulation, active MMP is expected to be captured by the proteinase inhibitor α2-macroglobulin (α2M)....

article 1999

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Inhibition of MMP synthesis by doxycycline and chemically modified tetracyclines (CMTs) in human endothelial cells

Hanemaaijer, R. (author), Visser, H. (author), Koolwijk, P. (author), Sorsa, T. (author), Salo, T. (author), Golub, L.M. (author), van Hinsbergh, V.W. (author), Gaubius Instituut TNO (author)

Doxycycline is a commonly used broad-spectrum antibiotic. Recently, it has been shown that it also inhibits the activity of mammalian collagenases and gelatinases, an activity unrelated to its antimicrobial efficacy. In this study, we show that doxycycline not only inhibits MMP-8 and MMP-9 (gelatinase B) activity, but also the synthesis of MMPs...

article 1998

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Doxycycline inhibits collagen synthesis by differentiated articular chondrocytes.

TeKoppele, J.M. (author), Beekman, B. (author), Verzijl, N. (author), Koopman, J.L. (author), de Groot, J. (author), Bank, R.A. (author), Gaubius Instituut TNO (author)

Doxycycline (DOX) profoundly inhibited collagen synthesis by differentiated articular chondrocytes. At 25 microM, the rate of collagen synthesis was suppressed by more than 50% without affecting cell proliferation (DNA levels) and general protein synthesis (35S-Met and 35S-Cys incorporation). Steady-state mRNA levels of type II collagen were...

article 1998

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Matrix degradation by chondrocytes cultured in alginate: IL-1β induces proteoglycan degradation and proMMP synthesis but does not result in collagen degradation

Beekman, B. (author), Verzijl, N. (author), de Roos, J.A.D.M. (author), TeKoppele, J.M. (author), Instituut voor Verouderings- en Vaatziekten Onderzoek TNO (author)

Objective: To determine the role of interleukin-1β (IL-1β) in the degradation of proteoglycans and collagen by articular chondrocytes. Design: Chondrocytes were cultured in alginate beads for 2 weeks to produce extracellular matrix, followed by the addition of IL-1β for 1 or 2 days. Breakdown of extracellular matrix (with and without activation...

article 1998

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Matrix metalloproteinase (MMP)-9 type IV collagenase/gelatinase implicated in the pathogenesis of Sjogren's syndrome

Konttinen, Y.T. (author), Halinen, S. (author), Hanemaaijer, R. (author), Sorsa, T. (author), Hietanen, J. (author), Ceponis, A. (author), Xu, J.W. (author), Manthorpe, R. (author), Whittington, J. (author), Larsson, Å. (author), Salo, T. (author), Kjeldsen, L. (author), Stenman, U.-H. (author), Eisen, A.Z. (author), Gaubius Instituut TNO (author)

Type IV collagenases/gelatinases (matrix metalloproteinases MMP-2 and MMP-9) in labial salivary glands (LSG) and saliva in Sjogren's syndrome (SS) and healthy controls were studied. Zymograms and Western blots disclosed that SS saliva contained 92/82 kD MMP-9/type IV collagenase duplex. Specific activity measurement disclosed 53.1 ± 9.8 U/mg...

article 1998

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Matrix metalloproteinase activity in equine synovial fluid: Influence of age, osteoarthritis, and osteochondrosis

Gaubius Instituut TNO (author), Brama, P.A.J. (author), TeKoppele, J.M. (author), Beekman, B. (author), van Weeren, P.R. (author), Barneveld, A. (author)

Objective - To investigate the influence of age, osteoarthritis (OA), and osteochondrosis (OC) on the matrix metalloproteinase (MMP) activity in the synovial fluid (SF) of equine joints. Methods - SF was collected from normal and osteoarthritic metacarpophalangeal joints (normal: 14 adult, 28 juvenile; OA: 22 adult). And from normal and...

article 1998

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Degenerated human articular cartilage at autopsy represents preclinical osteoarthritic cartilage: Comparison with clinically defined osteoarthritic cartilage

van Valburg, A.A. (author), Wenting, M.J.G. (author), Beekman, B. (author), TeKoppele, J.M. (author), Lafeber, F.P.G.J. (author), Bijlsma, J.W.J. (author)

article 1997

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Modified proenzymes as artificial substrates for proteolytic enzymes: Colorimetric assay of bacterial collagenase and matrix metalloproteinase activity using modified pro-urokinase

Gaubius Instituut TNO (author), Verheijen, J.H. (author), Nieuwenbroek, N.M.E. (author), Beekman, B. (author), Hanemaaijer, R. (author), Verspaget, H.W. (author), Ronday, K.H. (author), Bakker, A.H.F. (author)

We describe a new principle for assessment of the activity of proteolytic enzymes of all classes and show the application of this principle for the quantitative assay of bacterial collagenase and human matrix metalloproteinases (MMPs). Central to this new principle is the presence of a proenzyme that can be activated into an active enzyme by a...

article 1997

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Interactions between staphylokinase, plasmin(ogen), and fibrin. Staphylokinase discriminates between free plasminogen and plasminogen bound to partially degraded fibrin

Gaubius Instituut TNO (author), Sakharov, D.V. (author), Lijnen, H.R. (author), Rijken, D.C. (author)

Staphylokinase (STA), a protein of bacterial origin, induces highly fibrin-specific thrombolysis both in human plasma in vitro and in pilot clinical trials. Using fluorescence microscopy, we investigated the spatial distribution of fluorescein isothiocyanate (FITC)-labeled STA during lysis of a plasma clot and its binding to purified fibrin...

article 1996

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Tissue levels of matrix metalloproteinases MMP-2 and MMP-9 are related to the overall survival of patients with gastric carcinoma

TNO Preventie en Gezondheid Gaubius Instituut TNO (author), Sier, C.F.M. (author), Kubben, F.J.G.M. (author), Ganesh, S. (author), Heerding, M.M. (author), Griffioen, G. (author), Hanemaaijer, R. (author), van Krieken, J.H.J.M. (author), Lamers, C.B.H.W. (author), Verspaget, H.W. (author)

Proteinases are involved in tumour invasion and metastasis. Several matrix metalloproteinases (MMPs) have been shown to be increased in various human carcinomas. We assessed the levels of MMP-2 (gelatinase A) and MMP-9 (gelatinase B) in 50 gastric carcinomas and corresponding mucosa using quantitative gelatin zymography. Both MMP levels were...

article 1996