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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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Brama, P.A.J. (author), Tekoppele, J.M. (author), Bank, R.A. (author), Karssenberg, D. (author), Barneveld, A. (author), van Weeren, P.R. (author)The aim of this study was to evaluate topographical differences in the biochemical composition of the extracellular matrix of articular cartilage of the normal equine fetlock joint. Water content, DNA content, glycosaminoglycan (GAG) content and a number of characteristics of the collagen network (total collagen content, levels of hydroxylysine-...article 2000
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Brama, P.A.J. (author), Tekoppele, J.M. (author), Bank, R.A. (author), Barneveld, A. (author), van Weeren, P.R. (author), Gaubius Instituut TNO (author)Biochemical heterogeneity of cartilage within a joint is well known in mature individuals. It has recently been reported that heterogeneity for proteoglycan content and chondrocyte metabolism in sheep develops postnatally under the influence of loading. No data exist on the collagen network in general or on the specific situation in the horse....article 2000
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Verzijl, N. (author), de Groot, J. (author), Oldehinkel, E. (author), Bank, R.A. (author), Thorpe, S.R. (author), Baynes, J.W. (author), Bayliss, M.T. (author), Bijlsma, J.W.J. (author), Lafeber, F.P.J.G. (author), TeKoppele, J.M. (author), Gaubius Laboratory, Div. Vasc./Connective Tissue Res., TNO Prevention and Health, PO Box 2215, 2301 CE Leiden, Netherlands (author)Non-enzymic modification of tissue proteins by reducing sugars, the so-called Maillard reaction, is a prominent feature of aging. In articular cartilage, relatively high levels of the advanced glycation end product (AGE) pentosidine accumulate with age. Higher pentosidine levels have been associated with a stiffer collagen network in cartilage....article 2000
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Gaubius Instituut TNO (author), Verzijl, N. (author), de Groot, J. (author), Thorpe, S.R. (author), Bank, R.A. (author), Shaw, J.N. (author), Lyons, T.J. (author), Bijlsma, J.W.J. (author), Lafeber, F.P.J.G. (author), Baynes, J.W. (author), TeKoppele, J.M. (author)Collagen molecules in articular cartilage have an exceptionally long lifetime, which makes them susceptible to the accumulation of advanced glycation end products (AGEs). In fact, in comparison to other collagen-rich tissues, articular cartilage contains relatively high amounts of the AGE pentosidine. To test the hypothesis that this higher AGE...article 2000
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Chen, C.-T. (author), Burton-Wurster, N. (author), Lust, G. (author), Bank, R.A. (author), Tekoppele, J.M. (author)The first objective of this study was to determine if the cumulative effects of impact or smoothly arising compression would damage the matrix of articular cartilage. Canine cartilage explants were subjected to repeated impacts or to smoothly arising compressions of as much as 20 MPa at 0.3 Hz for as long as 120 minutes. An increase in the water...article 1999
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Brama, P.A.J. (author), TeKoppele, J.M. (author), Bank, R.A. (author), van Weeren, P.R. (author), Barneveld, A. (author), Dept. of Gen. and Large Anim. Surg., Faculty of Veterinary Medicine, Utrecht 3584CM, Netherlands Div. Vasc. Connective Tissue Res., Gaubius Laboratory, TNO Prevention and Health, Leiden 2301CE, Netherlands (author)Objective - To determine variations in biochemical characteristics of equine articular cartilage in relation to age and the degree of predisposition for osteochondral disease at a specific site. Sample Population - Articular cartilage specimens from 53 horses 4 to 30 years old. Procedure - Healthy specimens were obtained from 2 locations on the...article 1999
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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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de Groot, J. (author), Verzijl, N. (author), Bank, R.A. (author), Lafeber, F.P.J.G. (author), Bijlsma, J.W.J. (author), TeKoppele, J.M. (author)Objective. To examine the effect of nonenzymatic glycation of cartilage extracellular matrix on the synthetic activity of chondrocytes. Methods. The proteoglycan-synthesis rate (35SO42- incorporation) and levels of advanced nonenzymatic glycation (determined by high-performance liquid chromatography measurement of pentosidine) were evaluated in...article 1999
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Basser, P.J. (author), Schneiderman, R. (author), Bank, R.A. (author), Wachtel, E. (author), Maroudas, A. (author), TNO Preventie en Gezondheid (author)We have used an isotropic osmotic stress technique to assess the swelling pressures of human articular cartilage over a wide range of hydrations in order to determine from these measurements, for the first time, the tensile stress in the collagen network, P(c), as a function of hydration. Osmotic stress was applied by means of calibrated...article 1998
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Bank, R.A. (author), Bayliss, M.T. (author), Lafeber, F.P.J.G. (author), Maroudas, A. (author), Tekoppele, J.M. (author), Gaubius Instituut TNO (author)A biomechanical failure of the collagen network is postulated in many hypotheses of the development of osteoarthritis with advancing age. Here we investigate the accumulation of non-enzymatic glycation (NEG) products in healthy human articular cartilage, its relation to tissue remodelling and its role in tissue stiffening. Pentosidine levels...article 1998
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't Hart, B.A. (author), Bank, R.A. (author), de Roos, J.A.D.M. (author), Brok, H. (author), Jonker, M. (author), Theuns, H.M. (author), Hakimi, J. (author), Koppele, J.M.Te. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)The objective of this study was to analyse parameters in rhesus monkey collagen-induced arthritis (CIA) with which the inflammation and destruction of the joints can be described in quantitative terms. CIA was induced in genetically susceptible and resistant monkeys, which can be distinguished on the basis of the dominant resistance marker Mamu...article 1998
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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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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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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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- 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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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), Tenni, R. (author), Tekoppele, J.M. (author), Gaubius Instituut TNO (author)Measurement of the glycosylated hydroxylysines galactosyl- and glucosylgalactosylhydroxylysine (GH and GGH) in combination with other amino acids has been based on ion-exchange chromatography followed by reaction with ninhydrin. Here, a rapid and sensitive high-performance liquid chromatographic method with fluorimetric detection has been...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