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Ladeira L, Gamba A, Lesage R, Ertvelde JV, Jiang J, Verhoeven A, Roodzant D, Teunis M, Jover R, Vanhaecke T, Vinken M, Geris L, Staumont B. P11-09 Physiology-based framework to study chemical-induced cholestasis. Toxicol Lett 2022. [DOI: 10.1016/j.toxlet.2022.07.459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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2
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Staumont B, Ladeira L, Gamba A, Lesage R, Verhoeven A, Jiang J, Ertvelde JV, Barnes D, Janssen M, Kuchovska E, Berkhout J, Roodzant D, Teunis M, Bozada T, Luechtefeld T, Jover R, Vanhaecke T, Vinken M, Masereeuw R, Fritsche E, Piersma A, Heusinkveld H, Geris L. SOC-VI-08 Physiological maps: a benchmark tool for adverse outcome pathways and a cornerstone for the development of disease ontologies. Toxicol Lett 2022. [DOI: 10.1016/j.toxlet.2022.07.228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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3
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Mulder M, Lemmers R, Martens N, Van Der Zee L, Leijten F, Groot-Van Ruijven C, Van Hoek M, Lieverse L, Sijbrands E, Haak H, Leenen P, Verhoeven A, Dik W. Food intake improves anti-inflammatory function of HDL from patients with type 2 diabetes. Atherosclerosis 2020. [DOI: 10.1016/j.atherosclerosis.2020.10.469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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4
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Berk K, Rashid M, Verhoeven A, Mulder M, van Beek-Nieuwland Y, Athumani A, van de Laar R, Sijbrands E. Use of flavanols in type 2 diabetes mellitus with microalbuminuria (FLAVA-TRIAL): A randomized controlled multicenter trial. Clin Nutr ESPEN 2020. [DOI: 10.1016/j.clnesp.2020.09.288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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5
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Koenig ZA, Verhoeven A, Rosen D, Petrone AB. Lateral Heterotaxy Syndrome in a Newborn Caucasian Male. Cureus 2020; 12:e11205. [PMID: 33269136 PMCID: PMC7704025 DOI: 10.7759/cureus.11205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Heterotaxy syndrome is a varied spectrum of rearrangements of thoracic and abdominal organs that present many unique complications. Among all congenital deformities, heterotaxy syndrome is rare although this is likely an underestimate without routine imaging due to the benign nature of some defects. Numerous genes have been identified that play a role in its pathogenesis, and it has been hypothesized that heterotaxy syndrome is a consequence of both genetic and environmental impacts on the body axis. This case report also demonstrates the fundamental role of cardiac catheterization and imaging in further specifying the subtype of heterotaxy. Furthermore, it highlights the inconsistency of laterality with functional asplenia, visceral situs ambiguus, double-outlet right ventricle, and a left-sided inferior vena cava apart from other anomalies in a newborn male.
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Affiliation(s)
- Zachary A Koenig
- Medicine, West Virginia University School of Medicine, Morgantown, USA
| | - Alex Verhoeven
- Pediatrics, West Virginia University School of Medicine, Morgantown, USA
| | - David Rosen
- Anesthesiology, West Virginia University School of Medicine, Morgantown, USA
| | - Ashley B Petrone
- Pathology, Anatomy, Laboratory Medicine, West Virginia University School of Medicine, Morgantown, USA
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6
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Petrone AB, Koenig Z, Rosen D, Verhoeven A. Heterotaxy Syndrome in a Pediatric Cardiac Patient: A Case Report of Rare, Complex Congenital Heart Defects. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.03790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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7
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Hoogendoorn A, Den Hoedt S, Hartman E, Krabbendam-Peters I, Van Der Zee L, Van Gaalen K, Visser - Te Lintel Hekkert M, Van Der Heiden K, Witberg KT, Verhoeven A, Roeters Van Lennep J, Van Der Steen AFW, Duncker DJ, Mulder MT, Wentzel JJ. 5222A distinct LDL profile to predict the risk of cardiovascular disease in familial hypercholesterolemia subjects: initial pre-clinical results. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Aim
Cardiovascular disease development is highly variable between patients with familial hypercholesterolemia (FH). Since current risk prediction methods fail to estimate the risk of individual patients, all patients are treated with high-intensity lipid-lowering medication like statins and PCSK9-inhibitors. To prevent overtreatment (with its associated costs and side effects) of patients with a low risk, reliable biomarkers are urgently needed. While studying atherosclerosis development in an FH porcine model, we discovered a specific LDL profile that was directly associated with the severity of atherosclerosis development.
Methods
10 adult pigs with an LDLR mutation received a high-fat diet for 12 months. Atherosclerosis development in the three main coronary arteries was monitored with intravascular ultrasound (IVUS) and optical coherence tomography at three time points. After sacrifice, tissue was harvested for detailed histological analysis of the coronary plaque composition. Size-exclusion chromatography (SEC, n=10) and LC-MSMS (n=4) were used to assess the plasma lipoprotein profile, and the sphingolipid content of LDL, relative to cholesterol.
Results
Imaging and histology revealed a marked difference in pigs that developed large, lumen intruding plaques (IVUS-based plaque burden 13–77%) within 9 months (n=5) and pigs (n=5) that only developed early lesions (IVUS-based plaque burden 8–34%), even after 12 months of follow-up. The plaques seen in the fast responding pigs possessed distinct characteristics of advanced disease (i.e. heavy macrophage infiltration, large lipid-rich necrotic cores, neovascularisation, micro- and macrocalcifications and intraplaque haemorrhage, see figure). In these fast responders, fibrous cap atheroma occupied 34% of the total artery.
SEC revealed two distinct LDL subclasses: regular and “larger” LDL particles. Fast responding pigs with advanced atherosclerosis displayed a significantly higher ratio in cholesterol concentration of regular/'larger' LDL than slow responding pigs (1.7 (1.3–1.9) vs. 0.8 (0.6–1.2); (p=0.004), see figure). Compared to regular LDL, “larger” LDL contained relatively more sphingolipids in the fast responding than in the slow responding animals (regular LDL/'larger' LDL: S1P 0.5 (0.5–0.5) vs. 1.0 (0.8–1.2); Cer16:0 0.70 (0.67–0.73) vs. 1.04 (0.95–1.13); Cer18:0 0.60 (0.58–0.61) vs. 1.15 (1.13–1.16); Cer20:0 0.73 (0.73–0.74) vs. 0.94 (0.94–0.94)). “Larger” LDL particles and comparable sphingolipid ratios were also observed in FH patients. Cardiovascular data from our FH patient cohort, coupled to the LDL subclass distribution, will provide more insight into the potential of this novel biomarker.
Conclusion
A distinct difference in LDL subclasses, including a new “larger” LDL particle, was found in fast versus slow responding FH animals. This finding can potentially be used to identify FH patients at the highest risk of CVD to avoid overtreatement of low risk patients.
Acknowledgement/Funding
ERC- starter grant (grant agreement 310457)
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Affiliation(s)
- A Hoogendoorn
- Erasmus MC, University Medical Centre, Rotterdam, Netherlands (The)
| | - S Den Hoedt
- Erasmus MC, University Medical Centre, Rotterdam, Netherlands (The)
| | - E Hartman
- Erasmus MC, University Medical Centre, Rotterdam, Netherlands (The)
| | | | - L Van Der Zee
- Erasmus MC, University Medical Centre, Rotterdam, Netherlands (The)
| | - K Van Gaalen
- Erasmus MC, University Medical Centre, Rotterdam, Netherlands (The)
| | | | - K Van Der Heiden
- Erasmus MC, University Medical Centre, Rotterdam, Netherlands (The)
| | - K T Witberg
- Erasmus MC, University Medical Centre, Rotterdam, Netherlands (The)
| | - A Verhoeven
- Erasmus MC, University Medical Centre, Rotterdam, Netherlands (The)
| | | | | | - D J Duncker
- Erasmus MC, University Medical Centre, Rotterdam, Netherlands (The)
| | - M T Mulder
- Erasmus MC, University Medical Centre, Rotterdam, Netherlands (The)
| | - J J Wentzel
- Erasmus MC, University Medical Centre, Rotterdam, Netherlands (The)
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8
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Rashid M, Verhoeven A, van der Wiel H, Louter L, Yahya R, van der Zee L, Blommesteijn J, Roeters van Lennep J, Sijbrands E, Mulder M. In Depth Charachterization Of Dyslipidemia Beyond Conventional Lipid Panel In Patients With Type 2 Diabetes. Atherosclerosis 2019. [DOI: 10.1016/j.atherosclerosis.2019.06.507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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9
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Martinez-Huenchullan S, McLennan SV, Verhoeven A, Twigg SM, Tam CS. The emerging role of skeletal muscle extracellular matrix remodelling in obesity and exercise. Obes Rev 2017; 18:776-790. [PMID: 28474421 DOI: 10.1111/obr.12548] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Revised: 03/06/2017] [Accepted: 03/13/2017] [Indexed: 01/14/2023]
Abstract
Skeletal muscle extracellular matrix remodelling has been proposed as a new feature associated with obesity and metabolic dysfunction. Exercise training improves muscle function in obesity, which may be mediated by regulatory effects on the muscle extracellular matrix. This review examined available literature on skeletal muscle extracellular matrix remodelling during obesity and the effects of exercise. A non-systematic literature review was performed on PubMed of publications from 1970 to 2015. A total of 37 studies from humans and animals were retained. Studies reported overall increases in gene and protein expression of different types of collagen, growth factors and enzymatic regulators of the skeletal muscle extracellular matrix in obesity. Only two studies investigated the effects of exercise on skeletal muscle extracellular matrix during obesity, with both suggesting a regulatory effect of exercise. The effects of exercise on muscle extracellular matrix seem to be influenced by the duration and type of exercise training with variable effects from a single session compared with a longer duration of exercise. More studies are needed to elucidate the mechanisms behind skeletal muscle extracellular matrix remodelling during obesity and the effects of exercise.
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Affiliation(s)
- S Martinez-Huenchullan
- Greg Brown Diabetes & Endocrinology Laboratory and Charles Perkins Centre, University of Sydney, Sydney, Australia
| | - S V McLennan
- Greg Brown Diabetes & Endocrinology Laboratory and Charles Perkins Centre, University of Sydney, Sydney, Australia.,Department of Endocrinology, Royal Prince Alfred Hospital, Sydney, Australia.,Department of Chemical Pathology, Royal Prince Alfred Hospital, NSW Health Pathology, Sydney, Australia
| | - A Verhoeven
- Greg Brown Diabetes & Endocrinology Laboratory and Charles Perkins Centre, University of Sydney, Sydney, Australia
| | - S M Twigg
- Greg Brown Diabetes & Endocrinology Laboratory and Charles Perkins Centre, University of Sydney, Sydney, Australia.,Department of Endocrinology, Royal Prince Alfred Hospital, Sydney, Australia
| | - C S Tam
- Charles Perkins Centre and School of Life and Environmental Sciences, University of Sydney, Sydney, Australia
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10
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Bakker LEH, Boon MR, Annema W, Dikkers A, van Eyk HJ, Verhoeven A, Mayboroda OA, Jukema JW, Havekes LM, Meinders AE, Willems van Dijk K, Jazet IM, Tietge UJF, Rensen PCN. HDL functionality in South Asians as compared to white Caucasians. Nutr Metab Cardiovasc Dis 2016; 26:697-705. [PMID: 27052926 DOI: 10.1016/j.numecd.2016.02.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2015] [Revised: 01/31/2016] [Accepted: 02/10/2016] [Indexed: 12/28/2022]
Abstract
BACKGROUND AND AIMS South Asians have an exceptionally high risk of developing cardiovascular disease compared to white Caucasians. A contributing factor might be dysfunction of high density lipoprotein (HDL). We aimed to compare HDL function in different age groups of both ethnicities. METHODS AND RESULTS HDL functionality with respect to cholesterol efflux, anti-oxidation and anti-inflammation was determined using fasting, apoB-depleted, plasma samples from South Asian and white Caucasian neonates (n = 14 each), adolescent healthy men (n = 12 each, 18-25 y), and adult overweight men (n = 12 each, 40-50 y). Adolescents were subjected to a 5-day high fat high calorie diet (HCD) and adults to an 8-day very low calorie diet (LCD). Additionally, HDL composition was measured in adolescents and adults using (1)H-NMR spectroscopy. Anti-oxidative capacity was lower in South Asian adults before LCD (19.4 ± 2.1 vs. 25.8 ± 1.2%, p = 0.045, 95%-CI = [0.1; 12.7]) and after LCD (16.4 ± 2.4 vs. 27.6 ± 2.7%, p = 0.001, 95%-CI = [4.9; 17.5]). Anti-inflammatory capacity was reduced in South Asian neonates (23.8 ± 1.2 vs. 34.9 ± 1.3%, p = 0.000001, 95%-CI = [-14.6; -7.5]), and was negatively affected by an 8-day LCD only in South Asian adults (-12.2 ± 4.3%, p = 0.005, 95%-CI = [-5.9; -1.2]). Cholesterol efflux capacity was increased in response to HCD in adolescents (South Asians: +6.3 ± 2.9%, p = 0.073, 95%-CI = [-0.02; 0.46], Caucasians: +11.8 ± 3.4%, p = 0.002, 95%-CI = [0.17;0.65]) and decreased after LCD in adults (South Asians: -10.3 ± 2.4%, p < 0.001, 95%-CI = [-0.57; -0.20], Caucasians: -13.7 ± 1.9%, p < 0.00001, 95%-CI = [-0.67; -0.33]). Although subclass analyses of HDL showed no differences between ethnicities, cholesterol efflux correlated best with cholesterol and phospholipid within small HDL compared to other HDL subclasses and constituents. CONCLUSION Impaired HDL functionality in South Asians may be a contributing factor to their high CVD risk. CLINICAL TRIAL REGISTRATION NTR 2473 (URL: http://www.trialregister.nl/).
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Affiliation(s)
- L E H Bakker
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands
| | - M R Boon
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands; Einthoven Laboratory for Experimental Vascular Medicine, LUMC, Leiden, The Netherlands.
| | - W Annema
- Dept. Pediatrics, University Medical Center Groningen, Groningen, The Netherlands; Top Institute Food and Nutrition, Wageningen, The Netherlands
| | - A Dikkers
- Dept. Pediatrics, University Medical Center Groningen, Groningen, The Netherlands
| | - H J van Eyk
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands
| | - A Verhoeven
- Center for Proteomics and Metabolomics, LUMC, Leiden, The Netherlands
| | - O A Mayboroda
- Center for Proteomics and Metabolomics, LUMC, Leiden, The Netherlands
| | - J W Jukema
- Dept. Cardiology, LUMC, Leiden, The Netherlands
| | - L M Havekes
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands; Einthoven Laboratory for Experimental Vascular Medicine, LUMC, Leiden, The Netherlands; Dept. Cardiology, LUMC, Leiden, The Netherlands
| | - A E Meinders
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands
| | - K Willems van Dijk
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands; Dept. Human Genetics, LUMC, Leiden, The Netherlands
| | - I M Jazet
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands
| | - U J F Tietge
- Dept. Pediatrics, University Medical Center Groningen, Groningen, The Netherlands; Top Institute Food and Nutrition, Wageningen, The Netherlands
| | - P C N Rensen
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands; Einthoven Laboratory for Experimental Vascular Medicine, LUMC, Leiden, The Netherlands
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11
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Yahya R, Favari E, Bos S, Vongpromek R, van der Zee L, Touw A, Zimetti F, Adorn M, Bernini F, Verhoeven A, Sijbrands E, Mulder M, Roeters van Lennep J. Treatment of a compound heterozygous familial hypercholesterolemia patient with lomitapide. Atherosclerosis 2014. [DOI: 10.1016/j.atherosclerosis.2014.05.788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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van Deursen P, Oosterlaken T, Andre P, Verhoeven A, Ligeon V, de Jong J. PV-5 Measuring human immunodeficiency virus type 1 RNA loads in dried blood spots specimens using NucliSENS easyQ HIV-1 v2.0. J Clin Virol 2009. [DOI: 10.1016/s1386-6532(09)70140-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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van Deursen P, de Bie P, Verhoeven A, Ariens R, Spee F, Borst G, van Aarle P, van Binsbergen J. Experience with NA extraction from blood using NucliSens easyMAG extraction. J Clin Virol 2006. [DOI: 10.1016/s1386-6532(06)80807-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Knijff-Dutmer E, Drossaers-Bakker W, Verhoeven A, van der Sluijs Veer G, Boers M, van der Linden S, van de Laar M. Rheumatoid factor measured by fluoroimmunoassay: a responsive measure of rheumatoid arthritis disease activity that is associated with joint damage. Ann Rheum Dis 2002; 61:603-7. [PMID: 12079900 PMCID: PMC1754168 DOI: 10.1136/ard.61.7.603] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVES To determine whether rheumatoid factors (RFs), measured as continuous variables by time resolved fluoroimmunoassay, reflect disease activity in rheumatoid arthritis (RA). Further, to study the association of RFs and other disease activity parameters with radiological joint damage, especially in individual patients. METHODS In active, early RA, IgM and IgA RFs, as well as erythrocyte sedimentation rate (ESR), C reactive protein (CRP), tender joint score, and swollen joint score were assessed regularly. At the study start and at 56 and 80 weeks, radiographs of hands and feet were assessed by the Sharp score (van der Heijde modification). Associations between RFs and disease activity parameters were studied. In addition, associations between radiographic damage and disease activity parameters (baseline and time integrated) were analysed by non-parametric tests and multiple regression analysis. The relation between time integrated disease activity parameters and radiological damage in individual patients was analysed and visualised. RESULTS 155 patients were included. RF levels were strongly associated with the disease activity parameters (especially ESR and CRP) and with each other. All disease activity parameters, at baseline as well as time integrated parameters, were associated with (the progression of) radiographic damage. Moreover, in individual patients, a linear relationship between time integrated disease activity parameters and progression of radiological damage was seen. CONCLUSION RFs, measured as continuous variables, can be considered as disease activity parameters in patients with RA. The level of RF at baseline and the exposure to RF over time is associated with radiological damage. In individual patients, there is a constant relation between disease activity and radiological damage.
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Affiliation(s)
- E Knijff-Dutmer
- Rheumatology Twente, Medisch Spectrum Twente, Enschede, The Netherlands.
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15
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Lard LR, Boers M, Verhoeven A, Vos K, Visser H, Hazes JMW, Zwinderman AH, Schreuder GMT, Breedveld FC, De Vries RRP, van der Linden S, Zanelli E, Huizinga TWJ. Early and aggressive treatment of rheumatoid arthritis patients affects the association of HLA class II antigens with progression of joint damage. Arthritis Rheum 2002; 46:899-905. [PMID: 11953965 DOI: 10.1002/art.10151] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
OBJECTIVE The presence of certain HLA class II antigens is strongly associated with the progression of joint destruction in rheumatoid arthritis (RA). Such antigens may be more effective than other class II antigens in inducing the formation of autoreactive T cells after presentation of (auto)antigens. We investigated whether early and aggressive treatment with disease-modifying antirheumatic drugs could modify this relationship. METHODS We analyzed data from 2 studies of patients with early RA treated according to different strategies. The first study consisted of 2 cohorts, one (n = 109; median disease duration before treatment 4 months) was treated according to the pyramid strategy (initial nonsteroidal antiinflammatory drugs, followed by chloroquine [CQ] or sulfasalazine [SSZ] when necessary), and the other (n = 97; median disease duration before treatment 2 weeks) was immediately treated with CQ or SSZ. The second study comprised 155 patients (median disease duration 4 months) from the Combinatietherapie Bij Reumatoide Artritis (COBRA) trial, in which patients were randomly assigned to combination treatment with step-down prednisolone, methotrexate (MTX), and SSZ (n = 76) or with SSZ alone (n = 79). Prednisolone and MTX dosages were tapered and stopped after 28 and 40 weeks, respectively. The extent of joint damage was measured by the modified Sharp method. RESULTS In the pyramid treatment cohort, the median increase in Sharp score after 2 years was 12 in patients positive for the shared epitope (SE) and 1 in SE- patients. In the immediate treatment cohort, the median increase was 3 in SE+ patients and 2 in SE- patients. In the SSZ group of the COBRA study, the median increase in Sharp score after 1 year was 11 in DR4+ patients and 3 in DR4- patients. In the combination treatment group, the median increase was 4 in DR4+ patients and 2 in DR4- patients. Significance was confirmed by multiple regression using log-transformed scores. CONCLUSION Early and aggressive antirheumatic drug treatment affects the association of HLA class II alleles with progression of joint damage in RA.
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Affiliation(s)
- L R Lard
- Department of Rheumatology, Leiden University Medical Center, Leiden, The Netherlands.
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16
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Flake D, Verhoeven A, Robu I. The Cunningham Fellowship: three international points of view. Health Info Libr J 2001; 18:117-24. [PMID: 11780732 DOI: 10.1046/j.1365-2532.2001.00305.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The Medical Library Association Cunningham Fellowship Program provides funds for one medical librarian per year from outside the United States or Canada to work and learn in United States or Canadian medical libraries for a period of 4 months. An overview of the Cunningham Fellowship is presented from three different points of view-that of a Medical Library Association member who has worked closely with the Cunningham Fellowship programme, and two former Cunningham Fellows. Anita Verhoeven, who relates her impressions of American culture, architecture and art, was the 1998 MLA Cunningham Fellow and visited 33 libraries, met 171 librarians, visited prestigious universities and attended a Medical Library Association meeting. Ioana Robu, the 1997 Cunningham Fellow, visited 15 libraries in 13 cities during her experience. She describes the process of applying for the fellowship and assesses the impact that the 1997 Cunningham Fellowship has made on her life, her library and medical librarianship in Romania. An overview of the Cunningham Fellowship is also given, which includes the history, the application process, the requirements of the fellowship and the time table of the fellowship.
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Affiliation(s)
- D Flake
- Coastal AHEC Medical Library, Wilmington, North Carolina 28402-9025, USA.
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17
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Lassere MN, van der Heijde D, Johnson K, Bruynesteyn K, Molenaar E, Boonen A, Verhoeven A, Emery P, Boers M. Robustness and generalizability of smallest detectable difference in radiological progression. J Rheumatol 2001; 28:911-3. [PMID: 11327275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
The smallest detectable difference (SDD) reflects that component of a measure statistically attributable to error from the measurement process itself. As such it is an irreducible component of the inherent variability in measurements in clinical trials and will affect their design, whether randomized or observational. Even though the application of the SDD concept to assaying radiographs in rheumatoid arthritis is relatively new and not well understood, systematic work on the influences of radiographic SDD can be done. This report describes the effects of a number of clinical aspects of the disease and operational aspects of trials on the values of the SDD of radiographic progression data. We show that if conditions affecting SDD are known and kept constant across datasets, the SDD of radiological progression from one study may be generalizable to other studies. However, if any one condition varies, the SDD is distinctly unrobust and cannot be generalized to other studies.
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Affiliation(s)
- M N Lassere
- Department of Rheumatology, St George Hospital, NSW, Sydney, Australia.
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18
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Van den Eynden B, Hermann I, Schrijvers D, Van Royen P, Maes R, Vermeulen L, Herweyers K, Smits W, Verhoeven A, Clara R, Denekens J. Factors determining the place of palliative care and death of cancer patients. Support Care Cancer 2000; 8:59-64. [PMID: 10650900 DOI: 10.1007/s005209900094] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Factors determining the place of palliative care and death were studied by interviewing 40 patients using a semi-structured questionnaire. The 86 interviews assessed showed that both emotional and somatic factors played a part in the determination of whether patients were transferred and of their place of death. Emotional factors were mentioned in 41% as being of importance, and physical factors in 32%. Material and financial factors are probably underestimated owing to the methodology.
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Affiliation(s)
- B Van den Eynden
- Centre for General and Family Medicine, Universitaire Instelling Antwerpen, Universiteitsplein 1, University of Antwerp, Wilrijk, Belgium.
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Biemans HAM, Rowan AE, Verhoeven A, Vanoppen P, Latterini L, Foekema J, Schenning APHJ, Meijer EW, de Schryver FC, Nolte RJM. Hexakis Porphyrinato Benzenes. A New Class of Porphyrin Arrays. J Am Chem Soc 1998. [DOI: 10.1021/ja9815632] [Citation(s) in RCA: 109] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- H. A. M. Biemans
- Contribution from the Department of Organic Chemistry, NSR Center, University of Nijmegen, The Netherlands, the Department of Macromolecular and Organic Chemistry, Eindhoven University of Technology, The Netherlands, and the Department of Chemistry, Katholieke Universiteit of Leuven, Belgium
| | - A. E. Rowan
- Contribution from the Department of Organic Chemistry, NSR Center, University of Nijmegen, The Netherlands, the Department of Macromolecular and Organic Chemistry, Eindhoven University of Technology, The Netherlands, and the Department of Chemistry, Katholieke Universiteit of Leuven, Belgium
| | - A. Verhoeven
- Contribution from the Department of Organic Chemistry, NSR Center, University of Nijmegen, The Netherlands, the Department of Macromolecular and Organic Chemistry, Eindhoven University of Technology, The Netherlands, and the Department of Chemistry, Katholieke Universiteit of Leuven, Belgium
| | - P. Vanoppen
- Contribution from the Department of Organic Chemistry, NSR Center, University of Nijmegen, The Netherlands, the Department of Macromolecular and Organic Chemistry, Eindhoven University of Technology, The Netherlands, and the Department of Chemistry, Katholieke Universiteit of Leuven, Belgium
| | - L. Latterini
- Contribution from the Department of Organic Chemistry, NSR Center, University of Nijmegen, The Netherlands, the Department of Macromolecular and Organic Chemistry, Eindhoven University of Technology, The Netherlands, and the Department of Chemistry, Katholieke Universiteit of Leuven, Belgium
| | - J. Foekema
- Contribution from the Department of Organic Chemistry, NSR Center, University of Nijmegen, The Netherlands, the Department of Macromolecular and Organic Chemistry, Eindhoven University of Technology, The Netherlands, and the Department of Chemistry, Katholieke Universiteit of Leuven, Belgium
| | - A. P. H. J. Schenning
- Contribution from the Department of Organic Chemistry, NSR Center, University of Nijmegen, The Netherlands, the Department of Macromolecular and Organic Chemistry, Eindhoven University of Technology, The Netherlands, and the Department of Chemistry, Katholieke Universiteit of Leuven, Belgium
| | - E. W. Meijer
- Contribution from the Department of Organic Chemistry, NSR Center, University of Nijmegen, The Netherlands, the Department of Macromolecular and Organic Chemistry, Eindhoven University of Technology, The Netherlands, and the Department of Chemistry, Katholieke Universiteit of Leuven, Belgium
| | - F. C. de Schryver
- Contribution from the Department of Organic Chemistry, NSR Center, University of Nijmegen, The Netherlands, the Department of Macromolecular and Organic Chemistry, Eindhoven University of Technology, The Netherlands, and the Department of Chemistry, Katholieke Universiteit of Leuven, Belgium
| | - R. J. M. Nolte
- Contribution from the Department of Organic Chemistry, NSR Center, University of Nijmegen, The Netherlands, the Department of Macromolecular and Organic Chemistry, Eindhoven University of Technology, The Netherlands, and the Department of Chemistry, Katholieke Universiteit of Leuven, Belgium
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Ernst M, Verhoeven A, Meier BH. High-speed magic-angle spinning 13C MAS NMR spectra of adamantane: self-decoupling of the heteronuclear scalar interaction and proton spin diffusion. J Magn Reson 1998; 130:176-185. [PMID: 9500897 DOI: 10.1006/jmre.1997.1311] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We have investigated the carbon line shape of solid adamantane under high-speed magic-angle sample spinning (MAS) acquired without proton decoupling. The CH-group shows a spinning-speed-dependent line broadening while the CH2-group consists of a spinning-speed-independent sharp component and a spinning-speed-dependent broader part. These phenomena can be explained by self-decoupling of the J-interaction due to proton spin diffusion. Such a self-decoupling process can be described by a magnetization exchange process between the multiplet lines. Changing the spin-diffusion rate constant by off-resonance irradiation of the protons allows us to observe the full range from slow exchange to coalescence to fast exchange of the carbon spectra. One of the multiplet components in the CH2-group corresponds to a group spin of the protons of zero and therefore does not couple to the other protons. This gives rise to the sharp central line. The magnetization exchange rate constant between the different multiplet lines can be determined from the spectra and is a measure for the spinning-speed-dependent proton spin-diffusion rate constant. Even at an MAS speed of 30 kHz, proton spin diffusion is still observable despite the relatively weak intermolecular proton dipolar-coupling network in adamantane which results in a static proton line width of only 14 kHz (full width at half height).
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Affiliation(s)
- M Ernst
- Laboratory of Physical Chemistry, University of Nijmegen, Toernooiveld 1, Nijmegen, NL-6525 ED, The Netherlands
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Kennedy T, Magennis S, Harris C, Moody KW, Brooks G, Nobili A, Macario G, Frewini G, Rossetti AVE, Acik VO, Slawson DC, Shaughnessy AF, Doran BM, Verhoeven A. What clinical information do doctors need? West J Med 1997. [DOI: 10.1136/bmj.314.7084.903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Verhoeven A. What clinical information do doctors need? Citing old research may mislead readers. BMJ 1997; 314:905. [PMID: 9093126 PMCID: PMC2126234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Krekels MD, Verhoeven A, van Dun J, Cools W, Van Hove C, Dillen L, Coene MC, Wouters W. Induction of the oxidative catabolism of retinoid acid in MCF-7 cells. Br J Cancer 1997; 75:1098-104. [PMID: 9099955 PMCID: PMC2222791 DOI: 10.1038/bjc.1997.190] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Cytochrome P450-dependent oxidation is a pathway for all-trans-retinoic acid (all-trans-RA) catabolism. Induction of this catabolic pathway was studied in MCF-7 breast cancer cells. MCF-7 cells showed low constitutive all-trans-RA catabolism. Concentration-dependent induction was obtained by preincubation of the cells with all-trans-RA (10(-9) to 10(-6) M). Onset of induction was fast, being detectable within 60 min, with maximal induction (45-fold) obtained after 16 h. Enzymatic characterization of induced all-trans-RA catabolism showed an estimated Km value (Michaelis-Menten constant) of 0.33 microM and a Vmax value (maximal velocity of an enzyme-catalysed reaction) of 54.5 fmol polar all-trans-RA metabolites 10(6) cells(-1) h(-1). These kinetic parameters represent the overall formation of polar metabolites from all-trans-RA. Induction of all-trans-RA catabolism was also obtained with other retinoids, CH55 >> 13-cis-RA = all-trans-RA > 9-cis-RA > 4-keto-all-trans-RA > 4-keto-13-cis-RA > retinol. The potency of the retinoids to induce all-trans-RA catabolism was correlated to their retinoic acid receptor affinity (Crettaz et al, 1990; Repa et al, 1990; Sani et al, 1990). Induction of all-trans-RA catabolism was inhibited by actinomycin D. Furthermore, all-trans-RA did not increase cytosolic retinoic acid-binding protein (CRABP) mRNA levels. These data suggest that induction of all-trans-RA catabolism in MCF-7 cells is a retinoic acid receptor-mediated gene transcriptional event. Induced all-trans-RA catabolism was inhibited by various retinoids with decreasing potency in the order: all-trans-RA > 4-keto-all-trans-RA > 13-cis-RA > 9-cis-RA > 4-keto-13-cis-RA > retinol > CH55. The antitumoral compound liarozole-fumarate inhibited all-trans-RA catabolism with a potency similar to that of all-trans-RA.
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Affiliation(s)
- M D Krekels
- Janssen Research Foundation, Department of Oncology, Beerse, Belgium
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Prigogine T, Waterlot Y, Gottignies P, Verhoeven A, Decroly P. Acute nonhemodynamic pulmonary edema with nifedipine in primary pulmonary hypertension. Chest 1991; 100:563-4. [PMID: 1864141 DOI: 10.1378/chest.100.2.563] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
A 34-year-old man with primary pulmonary hypertension developed acute nonhemodynamic pulmonary edema after a loading dose of nifedipine. Changes of the vascular permeability induced by the drug acting on the arteriolar wall of the capillary system could be an explanation.
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Affiliation(s)
- T Prigogine
- Department of Medicine, Cl.E. Cavell, Brussels, Belgium
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Mittelstaedt A, Zilly A, Verhoeven A, Mielenz H. [Results of a controlled comparative study between cimetidine and pirenzepin in 60 patients with ulcera ventriculi or duodeni]. Fortschr Med 1981; 99:1764-8. [PMID: 7030892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Verhoeven A. [Parametritis caused by an IUD]. Ned Tijdschr Geneeskd 1981; 125:319-20. [PMID: 7219589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Goumans H, Thomas A, Verhoeven A, Voorma HO, Benne R. The role of eIF-4C in protein synthesis initiation complex formation. Biochim Biophys Acta 1980; 608:39-46. [PMID: 6901506 DOI: 10.1016/0005-2787(80)90131-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
eIF-4C has a pronounced stimulatory effect on initiation complex formation with native 80-S ribosomes (80-Sn) as the only source of ribosomal subunits, but only a small effect when washed 40-S subunits are used. eIF-4C is accessary to eIF-3 in dissociating 80-Sn ribosomes. eIF-4C is present on 40-Sn but absent on 40-Sn dimers, which occur in preparations of native ribosomes and are as such inactive in protein synthesis. eIF-4C dissociates 40-Sn dimers into active monomers. These results can be explained by assuming that the presence of eIF-4C on 40-Sn prevents: (a) premature association with 60-S ribosomal subunits and (b) dimerisation, thus increasing the rate and extent of initiation complex formation.
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Désir D, Féry F, Goldschmidt-Clermont P, Goldschmidt D, Van Gansbeke D, Verhoeven A. [Clinical applications of an extracorporeal pancreas]. Brux Med 1979; 59:497-502. [PMID: 534947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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