Searched for: subject%3A%22Lipoproteins%252C%255C%2BLDL%22
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Brussaard, H.E. (author), Leuven, J.A.G. (author), Kluft, C. (author), Krans, H.M.J. (author), van Duyvenvoorde, W. (author), Buytenhek, R. (author), van der Laarse, A. (author), Princen, H.M.G. (author), TNO Preventie en Gezondheid (author)
In type II diabetes mellitus the altered hormonal state after menopause may represent an additional cardiovascular risk factor. Estrogen replacement therapy (ERT) is associated with a decreased cardiovascular risk, at least in nondiabetic post-menopausal women. We studied the effect of ERT on plasma lipids and lipoproteins and on LDL oxidation...
article 1997
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van de Vijver, L.P.L. (author), Steyger, R. (author), van Poppel, G. (author), Boer, J.M.A. (author), Kruijssen, D.A.C.M. (author), Seidell, J.C. (author), Princen, H.M.G. (author), TNO Preventie en Gezondheid (author)
Autoantibodies against oxidized low-density lipoprotein (LDL) have been reported to be associated with atherosclerosis. However, data are not consistent. We compared the titres of autoantibodies to malondialdehyde-modified LDL in three groups, a case group with angiographically documented severe coronary stenosis (> 80% stenosis in at least 1...
article 1996
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Gaubius instituut TNO (author), Hendriks, W.L. (author), van der Boom, H. (author), van Vark, L.C. (author), Havekes, L.M. (author)
Lipoprotein lipase (LPL) stimulates the uptake of low-density lipoprotein (LDL) and very-low-density lipoprotein (VLDL) in different cell types, including macrophages, through bridging of LPL between lipoproteins and extracellular heparan sulphate proteoglycans (HSPG). Because macrophages produce LPL and because modified lipoproteins are present...
article 1996
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Gaubius Instituut TNO (author), van Vlijmen, B.J.M. (author), van Dijk, K.W. (author), van 't Hof, H.B. (author), van Gorp, P.J.J. (author), van der Zee, A. (author), van der Boom, H. (author), Breuer, M.L. (author), Hofker, M.H. (author), Havekesf, L.M. (author)
Apolipoprotein E*2(Arg-155 → Cys) (APOE*2) transgenic mice were generated and compared to the previously generated apolipoprotein E*3- Leiden (APOE*3-Leiden) transgenic mice to study the variable expression of hyperlipoproteinemia associated with these two APOE variants. In the presence of the endogenous mouse Apoe gene, the expression of the...
article 1996
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van Ree, J.H. (author), Hofker, M.H. (author), van den Broek, J.A.A. (author), van Deursen, J.M.A. (author), van der Boom, H. (author), Frants, R.R. (author), Wieringa, B. (author), Havekes, L.M. (author), Gaubius Instituut TNO (author)
The function of apolipoprotein (apo) C1 in vivo is not well understood. From in vitro studies it has been reported that an excess of apoC1 relative to apoE inhibits receptor-mediated uptake of remnant lipoproteins. In order to gain a better understanding of the role of apoC1 in lipoprotein metabolism in vivo, we have generated apoC1-deficient...
article 1995
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Princen, H.M.G. (author), van Duyvenvoorde, W. (author), Buytenhek, R. (author), van der Laarse, A. (author), van Poppel, G. (author), Gevers Leuven, J.A. (author), van Hinsbergh, V.W.M. (author), Gaubius Instituut TNO (author)
There is accumulating evidence that oxidative modification of LDL is an important step in the process of atherogenesis and that antioxidants may protect LDL from oxidation. We and others have previously shown that ingestion of pharmacological doses of the antioxidant D,L-α-tocopherol (vitamin E), far above the recommended daily intake (ie, 12 to...
article 1995
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de Rijke, Y.B. (author), Verwey, H.F. (author), Vogelezang, C.J.M. (author), van der Velde, E.A. (author), Princen, H.M.G. (author), van der Laarse, A. (author), Bruschke, A.V.G. (author), van Berkel, T.J.C. (author), Gaubius Instituut TNO (author)
Oxidation of low-density lipoprotein (LDL) may play a causal role in atherosclerosis. In this study we analyzed whether the severity of progression of coronary atherosclerosis is related to the susceptibility of LDL to oxidative modification. On the basis of repeated coronary angiography, 28 coronary bypass patients were divided into two groups:...
article 1995
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Lombardi, P. (author), Mulder, M. (author), de Wit, E. (author), van Berkel, T.J.C. (author), Frants, R.R. (author), Havekes, L.M. (author), Instituut voor verouderings- en vaatziekten onderzoek TNO (author)
In previous studies we have shown that in HepG2 cells, as compared with fibroblasts, the low-density lipoprotein (LDL) receptor is only weakly down-regulated upon incubation of the cells with LDL. To explain this difference in down-regulation of the LDL-receptor activity, we studied simultaneously the intracellular processing of 125I-labelled...
article 1993
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Atsma, D.E. (author), Feitsma, R.I.J. (author), Camps, J. (author), van 't Hooft, F.M. (author), van der Wall, E.E. (author), Nieuwenhuizen, W. (author), Pauwels, E.K.J. (author), Gaubius Laboratory Instituut voor verouderings- en vaatziekten onderzoek TNO (author)
In this study we evaluated two different 99mTc-labeling techniques to produce 99mTc-low density lipoprotein (99mTc-LDL) suitable for the scintigraphic delineation of experimental atherosclerotic lesions. The two methods are 1) a procedure that uses stannous chloride and sodium borohydride (borohydride method) and 2) a procedure that uses sodium...
article 1993
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Gaubius Instituut TNO (author), Mulder, M. (author), Lombardi, P. (author), Jansen, H. (author), van Berkel, T.J.C. (author), Frants, R.R. (author), Havekes, L.M. (author)
It has previously been shown that lipoprotein lipase (LPL) enhances the binding of low density lipoproteins (LDL) and very low density lipoproteins (VLDL) to HepG2 cells and fibroblasts, up to 80-fold. This increase in binding is LDL receptor-independent and is due to a bridging of LPL between extracellular heparan sulfate proteoglycans (HSPG)...
article 1993
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Gaubius Instituut TNO (author), Lombardi, P. (author), Mulder, M. (author), van der Boom, H. (author), Frants, R.R. (author), Havekes, L.M. (author)
Binding studies at 37 °C showed that lipoprotein lipase-treated very low density lipoproteins (LPL-VLDL) and very low density lipoproteins (VLDL), once taken up via the low density lipoprotein (LDL) receptor, are poorly degraded by HepG2 cells as compared with LDL. Determination of the initial endocytotic rate for LPL-VLDL and VLDL as compared...
article 1993
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Mulder, M. (author), de Wit, E. (author), Havekes, L.M. (author), Gaubius Instituut TNO (author)
It has been suggested that besides the LDL-receptor, hepatocytes possess an apo E or remnant receptor. To evaluate which hepatic lipoprotein receptor is involved in VLDL remnant catabolism, we studied the binding of VLDL remnants to HepG2 cells. Native VLDL was obtained from type IIb hyperlipidemic patients and treated with bovine milk...
article 1991
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van Hinsbergh, V.W.M. (author), Scheffer, M.A. (author), Gaubius Instituut TNO (author)
A possible protective effect of propionyl-L-carnitine on human endothelial cells was studied both under basal culture conditions and in the presence of agents capable of influencing oxidative damage, such as glucose/glucose oxidase and oxidized low-density lipoproteins. Propionyl-L-carnitine had no significant effect on the observed decline in...
article 1991
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Kempen, H.J.M. (author), Vermeer, M. (author), de Wit, E. (author), Havekes, L.M. (author), Gaubius instituut TNO (author)
Human monocyte-derived macrophages were incubated for 48 hours in Medium 199 with 1% human serum albumin, and with 100 μg acetyl low density lipoprotein (LDL) or β-very low density lipoprotein (β-VLDL), with or without various concentrations of compactin, lovastatin, simvastatin, or pravastatin. The mass of free (FC) and esterified (CE)...
article 1991
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Gaubius Instituut TNO (author), Atsma, D.E. (author), Kempen, H.J.M. (author), Nieuwenhuizen, W. (author), van 't Hooft, F.M. (author), Pauwels, E.K.J. (author)
Four 99mTc and three 123I labeling methods were evaluated for their suitability to label low density lipoproteins (LDL) for the purpose of scintigraphic biodistribution studies. For 99mTc these methods were: direct incorporation in LDL of 99mTcO4- using sodium dithionite (dithionite method); a method using first N,N-dimethylformamide to prepare...
article 1991
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Gaubius instituut TNO (author), Cohen, L.H. (author), Griffioen, M. (author)
Hep G2 cells were incubated under conditions known to influence the HMG-CoA (3-hydroxy-3-methylglutaryl-CoA) reductase activity, e.g. in the presence of compactin (a competitive inhibitor of HMG-CoA reductase itself) and U18666A (a squalene-2,3-epoxide cyclase inhibitor). We studied the effects of these conditions both on the HMG-CoA reductase...
article 1988
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Gaubius instituut TNO (author), Havekes, L.M. (author), de Wit, E.C. (author), Princen, H.M. (author)
We have previously shown that in Hep G2 cells and human hepatocytes, as compared with fibroblasts, the low-density lipoprotein (LDL) receptor activity is only weakly down-regulated after incubation of the cells with LDL, whereas incubation with high-density lipoproteins (HDL) of density 1.16-1.20 g/ml (heavy HDL) strongly increased the LDL...
article 1987
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Gaubius instituut TNO (author), Kempen, H.J. (author), Kuipers, F. (author), van Berkel, T.J.C. (author), Vonk, R.J. (author)
As shown by us previously (van Berkel et al. 1985. J. Biol. Chem. 260: 2694-2699 and van Berkel et al. 1985. J. Biol. Chem. 260: 12203-12207) the clearance of both low density lipoproteins (LDL) and high density lipoproteins (HDL) from the blood can be greatly enhanced by pretreatment of these lipoproteins with a tris-galactosylated cholesterol...
article 1987
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Gaubius instituut TNO (author), Cohen, L.H. (author), Griffioen, M. (author), Havekes, L. (author)
Compactin, an inhibitor of HMG-CoA (3-hydroxy-3-methylglutaryl-CoA) reductase, decreased cholesterol synthesis in intact Hep G2 cells. However, after the inhibitor was washed away, the HMG-CoA-reductase activity determined in the cell homogenate was found to be increased. Also the high-affinity association of LDL (low-density lipoprotein) to Hep...
article 1984
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van Hinsbergh, V.W.M. (author), Havekes, L. (author), Emeis, J.J. (author), van Corven, E. (author), Scheffer, M. (author), Gaubius Instituut TNO (author)
Binding and metabolism of low density lipoprotein (LDL) and acetylated LDL were examined in endothelial cells from human umbilical cord arteries and veins. Both high and low affinity LDL interactions were observed. High affinity LDL binding and catabolism were increased five- to sevenfold after preincubation for 18 hours in LPDS containing...
article 1983
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