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Bongers, C.C.W.G. (author), ten Haaf, D.S.M. (author), Catoire, M. (author), Kersten, B. (author), Wouters, J.A. (author), Eijsvogels, T.M.H. (author), Hopman, M.T.E. (author)The purpose of this study was to examine the effects of 12 weeks collagen peptide (CP) supplementation on knee pain and function in individuals with self-reported knee pain. Healthy physically active individuals (n = 167, aged 63 [interquartile range = 56-68] years) with self-reported knee pain received 10 g/day of CP or placebo for 12 weeks....article 2020
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van Spil, W.E. (author), de Groot, J. (author), Lems, W.F. (author), Oostveen, J.C.M. (author), Lafeber, F.P.J.G. (author), TNO Kwaliteit van Leven (author)Context: Molecules that are released into biological fluids during matrix metabolism of articular cartilage, subchondral bone, and synovial tissue could serve as biochemical markers of the process of osteoarthritis (OA). Unfortunately, actual breakthroughs in the biochemical OA marker field are limited so far. Objective: By reviewing the status...article 2010
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Fernandes, H. (author), Mentink, A. (author), Bank, R. (author), Stoop, R. (author), van Blitterswijk, C. (author), de Boer, J. (author), TNO Kwaliteit van Leven (author)Human multipotent mesenchymal stromal cells (hMSCs) are multipotent cells that, in the presence of appropriate stimuli, can differentiate into different lineages such as the osteogenic, chondrogenic, and adipogenic lineages. In the presence of ascorbic acid, MSCs secrete an extracellular matrix mainly composed of collagen type I. Here we...article 2010
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Rubbens, M.P. (author), Mol, A. (author), Boerboom, R.A. (author), Bank, R.A. (author), Baaijens, F.P.T. (author), Bouten, C.V.C. (author), TNO Industrie en Techniek TNO Kwaliteit van Leven (author)Tissue-engineered heart valves lack sufficient amounts of functionally organized structures and consequently do not meet in vivo mechanical demands. To optimize tissue architecture and hence improve mechanical properties, various in vitro mechanical conditioning protocols have been proposed, of which intermittent straining is most promising in...article 2009
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Rubbens, M.P. (author), Mol, A. (author), van Marion, M.H. (author), Hanemaaijer, R. (author), Bank, R.A. (author), Baaijens, F.P.T. (author), Bouten, C.V.C. (author), TNO Kwaliteit van Leven (author)Similar to native cardiovascular tissues, the mechanical properties of engineered cardiovascular constructs depend on the composition and quality of the extracellular matrix, which is a net result of matrix remodeling processes within the tissue. To improve tissue remodeling, and hence tissue mechanical properties, various mechanical...article 2009
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Meyer, F.J. (author), Burnand, K.G. (author), Abisi, S. (author), TeKoppele, J.M. (author), van Els, B. (author), Smith, A. (author), TNO Kwaliteit van Leven (author)Background: The presence of fibrous tissue in poorly healing venous leg ulcers suggests abnormal collagen metabolism. The aim was to determine whether there were differences in collagen turnover and matrix metalloproteinase (MMP) activity between ulcers that healed, those that did not heal and normal skin. Methods: Biopsies were taken from the...article 2008
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Jenniskens, Y.M. (author), Koevoet, W. (author), de Bart, A.C.W. (author), Weinans, H. (author), Jahr, H. (author), Verhaar, J.A.N. (author), de Groot, J. (author), van Osch, G.J.V.M. (author), TNO Kwaliteit van Leven (author)Objective: Examine effects of insulin-like growth factor 1 (IGF1), transforming growth factor β2 (TGFβ2) and fibroblast growth factor 2 (FGF2) on proteoglycan and collagen network and biomechanical properties of the newly formed cartilage matrix. Methods: Bovine articular chondrocytes were cultured in alginate beads for 3 weeks with or without...article 2006
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TNO Kwaliteit van Leven (author), van der Slot-Verhoeven, A.J. (author), van Dura, E.A. (author), Attema, J. (author), Blauw, B. (author), de Groot, J. (author), Huizinga, T.W.J. (author), Zuurmond, A.M. (author), Bank, R.A. (author)Fibrotic processes in humans are characterised by an excessive accumulation of collagen containing increased levels of hydroxyallysine-derived cross-links. The occurrence of these cross-links appears to be an important criterion in assessing the irreversibility of fibrosis. We hypothesise that increased hydroxyallysine cross-linking results in a...article 2005
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Breeveld-Dwarkasing, V.N.A. (author), te Koppele, J.M. (author), Bank, R.A. (author), van der Weijden, G.C. (author), Taverne, M.A.M. (author), Dissel van - Emiliani, F.M.F. (author), Gaubius Instituut TNO (author)The objective of the present study was to assess if cervical ripeness could be quantified by measuring the percentage of denaturation of the collagen network of the stromal layer. Biopsy specimens from the caudal part of the cervix were obtained from nine pluriparous cows between Days 149 and 157 of gestation (second-trimester biopsy), at...article 2003
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Bank, R.A. (author), Verzijl, N. (author), Lafeber, F.P.J.G. (author), Tekoppele, J.M. (author), Gaubius instituut TNO TNO Preventie en Gezondheid (author)Objective: The collagen network in human articular cartilage experiences a large number of stress cycles during life as it shows hardly any turnover after adolescence. We hypothesized that, to withstand fatigue failure, the physical condition of the collagen network laid down at adolescence is of crucial importance for the age of onset of...article 2002
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de Groot, J. (author), Bank, R.A. (author), Tchetverikov, I. (author), Verzijl, N. (author), TeKoppele, J.M. (author), Gaubius Instituut (author)Osteoarthritis is a disabling joint disease that is characterized by the progressive destruction of articular cartilage. Diagnosis is based on clinical symptoms in combination with radiography, which is relatively insensitive and provides only an indication of accumulated damage. Alternative methods, such as molecular markers, are therefore...article 2002
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de Groot, J. (author), Verzijl, N. (author), Budde, M. (author), Bijlsma, J.W.J. (author), Lafeber, F.P.J.G. (author), TeKoppele, J.M. (author), Gaubius Instituut (author)The integrity of the collagen network is essential for articular cartilage to fulfill its function in load support and distribution. Damage to the collagen network is one of the first characteristics of osteoarthritis. Since extensive collagen damage is considered irreversible, it is crucial that chondrocytes maintain a functional collagen...article 2001
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Mansell, J.P. (author), Kerrigan, J. (author), McGill, J. (author), Bailey, J. (author), TeKoppele, J. (author), Sandy, J.R. (author)Cleft lip and palate is a common craniofacial malformation in man. The aetiology is multifactorial and not known. Since collagen is a major structural component of the developing palate, we studied its composition and metabolism during palate shelf formation and elevation in the rat. Palatal shelves were harvested at embryonic days (E) 15, 16...article 2000
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Wassen, M.H.M. (author), Lammens, J. (author), Tekoppele, J.M. (author), Sakkers, R.J.B. (author), Liu, Z. (author), Verbout, A.J. (author), Bank, R.A. (author)Although >80% of the mineral in mammalian bone is present in the collagen fibrils, limited information is available about factors that determine a proper deposition of mineral. This study investigates whether a specific collagen matrix is required for fibril mineralization. Calcifying callus from dog tibias was obtained at various times (3-21...article 2000
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Bank, R.A. (author), Robins, S.P. (author), Wijmenga, C. (author), Breslau-Siderius, L.J. (author), Bardoel, A.F.J. (author), van der Sluijs, H.A. (author), Pruijs, H.E.H. (author), Tekoppele, J.M. (author)Bruck syndrome is characterized by the presence of osteoporosis, joint contractures, fragile bones, and short stature. We report that lysine residues within the telopeptides of collagen type I in bone are underhydroxylated, leading to aberrant crosslinking, but that the lysine residues in the triple helix are normally modified. In contrast to...article 1999
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Gaubius instituut TNO (author), Bank, R.A. (author), Tekoppele, J.M. (author), Oostingh, G. (author), Hazleman, B.L. (author), Riley, G.P. (author)Objectives - To investigate age related and site specific variations in turnover and chemistry of the collagen network in healthy tendons as well as the role of collagen remodelling in the degeneration of the supraspinatus tendon (ST-D) in rotator cuff tendinitis. Methods - Collagen content and the amount of hydroxylysine (Hyl),...article 1999
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Beekman, B. (author), Verzijl, N. (author), Bank, R.A. (author), Von Der Mark, K. (author), TeKoppele, J.M. (author), TNO Preventie en Gezondheid (author)The extracellular matrix synthesized by articular chondrocytes cultured in alginate beads was investigated. Collagen levels increased sigmoidally with time and remained constant after 2 weeks of culture. The presence of cartilage-specific type II collagen was confirmed immunohistochemically. Predominantly type H collagen was present in the...article 1997
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Bank, R.A. (author), Beekman, B. (author), Verzijl, N. (author), de Roos, J.A.D.M. (author), Nico Sakkee, A. (author), Tekoppele, J.M. (author), TNO Preventie en Gezondheid (author)A high-performance liquid chromatographic assay was developed for pyridinium crosslinks and pentosidine in mature collagen of a wide variety of connective tissue hydrolysates by a simple two-step isocratic assay using a reversed-phase column. The crosslinks (including the internal standard pyridoxine) were optimally detected by their native...article 1997
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Beekman, B. (author), Verzijl, N. (author), de Roos, J.A.D.M. (author), Koopman, J.L. (author), Tekoppele, J.M. (author), Leiden, Netherlands Gaubius Instituut TNO (author)Doxycycline is known for its ability to inhibit matrix metalloproteinases (MMPs), a family of enzymes that play a role in cartilage breakdown in arthritides. Its prophylactic effect in reducing joint degradation in osteoarthritis is mainly attributed to this property. In this study, we show that doxycycline exhibits a profound inhibition of...article 1997
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Seifert, W.F. (author), Bosma, A. (author), Brouwer, A. (author), Hendriks, H.F.J. (author), Roholl, P.J.M. (author), van Leeuwen, R.E.W. (author), de Thiel van-Ruiter, G.C.F. (author), Seifert-Bock, I. (author), Knook, D.L. (author), TNO Preventie en Gezondheid (author)Earlier studies have shown that retinoid administration suppresses the generation of hepatic fibrosis and stimulates its regression in normal (i.e., vitamin A-sufficient) carbon tetrachloride-treated rats. This study focuses on the possible role of a marginal or deficient vitamin A status on carbon tetrachloride-induced fibrosis. This...article 1994