Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    How the COVID-19 pandemic highlights the necessity of animal research
    Genzel, Lisa ; Adan, Roger ; Berns, Anton ; Beucken, Jeroen van den; Blokland, Arjan ; Boddeke, Erik H.W.G.M. ; Bogers, Willy M. ; Bontrop, Ronald ; Bulthuis, R. ; Bousema, Teun ; Clevers, Hans ; Coenen, Tineke C.J.J. ; Dam, Anne Marie van; Deen, Peter M.T. ; Dijk, K.W. van; Eggen, Bart J.L. ; Elgersma, Ype ; Erdogan, Izel ; Englitz, Bernard ; Fentener van Vlissingen, J.M. ; Fleur, Susanne la; Fouchier, Ron ; Fitzsimons, Carlos P. ; Frieling, Wilbert ; Haagmans, Bart ; Heesters, Balthasar A. ; Henckens, Marloes ; Herfst, Sander ; Hol, Elly ; Hove, Daniel van den; Jonge, Marien I. de; Jonkers, Jos ; Joosten, Leo A.B. ; Kalsbeek, Andries ; Kamermans, Maarten ; Kampinga, Harm H. ; Kas, Martien J. ; Keijer, J. ; Kersten, Sander ; Kiliaan, Amanda J. ; Kooij, Taco W.A. ; Kooijman, Sander ; Koopman, Werner J.H. ; Korosi, Aniko ; Krugers, Harm J. ; Kuiken, Thijs ; Kushner, Steven A. ; Langermans, Jan A.M. ; Lesscher, Heidi ; Lucassen, Paul J. ; Lutgens, Esther ; Netea, Mihai G. ; Noldus, Lucas P.J.J. ; Meer, Jos W.M. van der; Meye, Frank J. ; Mul, Joram D. ; Oers, Kees van; Olivier, Jocelien D.A. ; Pasterkamp, R.J. ; Philippens, Ingrid H.C.H.M. ; Prickaerts, Jos ; Pullox, Bart J.A. ; Rensen, Patrick C.N. ; Rheenen, Jacco van; Rij, Ronald P. van; Ritsma, Laila ; Rockx, Barry H.G. ; Roozendaal, Benno ; Schothorst, Evert M. van; Stittelaar, K. ; Stockhofe, Norbert ; Swaab, Dick F. ; Swart, Rik L. de; Vanderschuren, Louk J.M.J. ; Vries, Taco de; Vrij, Femke de; Wezel, Richard van; Wierenga, Corette J. ; Wiesmann, Maximilian ; Willuhn, Ingo ; Zeeuw, Chris I. de; Homberg, Judith R. - \ 2020
    Current Biology 30 (2020)18. - ISSN 0960-9822 - p. R1014 - R1018.
    Recently, a petition was offered to the European Commission calling for an immediate ban on animal testing. Although a Europe-wide moratorium on the use of animals in science is not yet possible, there has been a push by the non-scientific community and politicians for a rapid transition to animal-free innovations. Although there are benefits for both animal welfare and researchers, advances on alternative methods have not progressed enough to be able to replace animal research in the foreseeable future. This trend has led first and foremost to a substantial increase in the administrative burden and hurdles required to make timely advances in research and treatments for human and animal diseases. The current COVID-19 pandemic clearly highlights how much we actually rely on animal research. COVID-19 affects several organs and systems, and the various animal-free alternatives currently available do not come close to this complexity. In this Essay, we therefore argue that the use of animals is essential for the advancement of human and veterinary health. In this Essay, Genzel et al. make the case for animal research in light of the COVID-19 pandemic.
    Deletion of haematopoietic Dectin-2 or CARD9 does not protect from atherosclerosis development under hyperglycaemic conditions
    Thiem, Kathrin ; Hoeke, Geerte ; Zhou, Enchen ; Hijmans, Anneke ; Houben, Tom ; Boels, Margien G. ; Mol, Isabel M. ; Lutgens, Esther ; Shiri-Sverdlov, Ronit ; Bussink, Johan ; Kanneganti, Thirumala D. ; Boon, Mariëtte R. ; Stienstra, Rinke ; Tack, Cees J. ; Rensen, Patrick C.N. ; Netea, Mihai G. ; Berbée, Jimmy F.P. ; Diepen, Janna A. van - \ 2020
    Diabetes & Vascular Disease Research 17 (2020)1. - ISSN 1479-1641 - p. 1 - 12.
    Atherosclerosis - C-type lectin receptors - CARD9 - Dectin-2 - hyperglycaemia - inflammation - monocytes/macrophages

    Background: C-type lectin receptors, including Dectin-2, are pattern recognition receptors on monocytes and macrophages that mainly recognize sugars and sugar-like structures present on fungi. Activation of C-type lectin receptors induces downstream CARD9 signalling, leading to the production of cytokines. We hypothesized that under hyperglycaemic conditions, as is the case in diabetes mellitus, glycosylated protein (sugar-like) structures activate C-type lectin receptors, leading to immune cell activation and increased atherosclerosis development. Methods: Low-density lipoprotein receptor-deficient mice were lethally irradiated and transplanted with bone marrow from control wild-type, Dectin-2−/− or Card9−/− mice. After 6 weeks of recovery, mice received streptozotocin injections (50 mg/g BW; 5 days) to induce hyperglycaemia. After an additional 2 weeks, mice were fed a Western-type diet (0.1% cholesterol) for 10 weeks. Results and Conclusion: Deletion of haematopoietic Dectin-2 reduced the number of circulating Ly6Chi monocytes, increased pro-inflammatory cytokine production, but did not affect atherosclerosis development. Deletion of haematopoietic CARD9 tended to reduce macrophage and collagen content in atherosclerotic lesions, again without influencing the lesion size. Deletion of haematopoietic Dectin-2 did not influence atherosclerosis development under hyperglycaemic conditions, despite some minor effects on inflammation. Deletion of haematopoietic CARD9 induced minor alterations in plaque composition under hyperglycaemic conditions, without affecting lesion size.

    Akkermansia muciniphila Exerts Lipid-Lowering and Immunomodulatory Effects without Affecting Neointima Formation in Hyperlipidemic APOE*3-Leiden.CETP Mice
    Katiraei, Saeed ; Vries, Margreet R. de; Costain, Alice H. ; Thiem, Kathrin ; Hoving, Lisa R. ; Diepen, Janna A. van; Smits, Hermelijn H. ; Bouter, Kristien E. ; Rensen, Patrick C.N. ; Quax, Paul H.A. ; Nieuwdorp, Max ; Netea, Mihai G. ; Vos, Willem M. de; Cani, Patrice D. ; Belzer, Clara ; Dijk, Ko Willems van; Berbée, Jimmy F.P. ; Harmelen, Vanessa van - \ 2020
    Molecular Nutrition & Food Research 64 (2020)15. - ISSN 1613-4125 - 10 p.
    Akkermansia muciniphila - atherosclerosis - immunity - lipid metabolism - mesenteric lymph nodes

    Scope: Akkermansia muciniphila (A. muciniphila) is an intestinal commensal with anti-inflammatory properties both in the intestine and other organs. The aim is to investigate the effects of oral administration of A. muciniphila on lipid metabolism, immunity, and cuff-induced neointima formation in hyperlipidemic APOE*3-Leiden (E3L).CETP mice. Methods and results: Hyperlipidemic male E3L.CETP mice are daily treated with 2 × 108 CFU A. muciniphila by oral gavage for 4 weeks and the effects are determined on plasma lipid levels, immune parameters, and cuff-induced neointima formation and composition. A. muciniphila administration lowers body weight and plasma total cholesterol and triglycerides levels. A. muciniphila influences the immune cell composition in mesenteric lymph nodes, as evident from an increased total B cell population, while reducing the total T cell and neutrophil populations. Importantly, A. muciniphila reduces the expression of the activation markers MHCII on dendritic cells and CD86 on B cells. A. muciniphila also increases whole blood ex vivo lipopolysaccharide-stimulated IL-10 release. Finally, although treatment with A. muciniphila improves lipid metabolism and immunity, it does not affect neointima formation or composition. Conclusions: Four weeks of treatment with A. muciniphila exerts lipid-lowering and immunomodulatory effects, which are insufficient to inhibit neointima formation in hyperlipidemic E3L.CETP mice.

    A single day of high-fat diet feeding induces lipid accumulation and insulin resistance in brown adipose tissue in mice
    Kuipers, Eline N. ; Held, Ntsiki M. ; Het Panhuis, Wietse In; Modder, Melanie ; Ruppert, Philip M.M. ; Kersten, Sander ; Kooijman, Sander ; Guigas, Bruno ; Houtkooper, Riekelt H. ; Rensen, Patrick C.N. ; Boon, Mariëtte R. - \ 2019
    American Journal of Physiology. Endocrinology and Metabolism 317 (2019)5. - ISSN 0193-1849 - p. E820 - E830.
    brown adipose tissue - high-fat diet - lipid accumulation - macrophage - mitochondrial dynamics

    Brown adipose tissue (BAT) catabolizes glucose and fatty acids to produce heat and thereby contributes to energy expenditure. Long-term high-fat diet (HFD) feeding results in so-called 'whitening' of BAT characterized by increased lipid deposition, mitochondrial dysfunction, and reduced fat oxidation. The aim of the current study was to unravel the rate and related mechanisms by which HFD induces BAT whitening and insulin resistance. Wild-type mice were fed a HFD for 0, 1, 3, or 7 days. Within 1 day of HFD, BAT weight and lipid content were increased. HFD also immediately reduced insulin-stimulated glucose uptake by BAT, indicating rapid induction of insulin resistance. This was accompanied by a tendency toward a reduced uptake of triglyceride-derived fatty acids by BAT. Mitochondrial mass and Ucp1 expression were unaltered, whereas after 3 days of HFD, markers of mitochondrial dynamics suggested induction of a more fused mitochondrial network. Additionally, HFD also increased macrophage markers in BAT after 3 days of HFD. Counterintuitively, the switch to HFD was accompanied by an acute rise in core body temperature. We showed that a single day of HFD feeding is sufficient to induce the first signs of whitening and insulin resistance in BAT, which reduces the uptake of glucose and triglyceride-derived fatty acids. BAT whitening and insulin resistance are likely sustained by reduced mitochondrial oxidation due to changes in mitochondrial dynamics and macrophage infiltration, respectively. Likely, the switch to HFD swiftly induces thermogenesis in other metabolic organs, which allows attenuation of BAT thermogenesis.

    Deletion of hematopoietic Dectin-2 or CARD9 does not protect against atherosclerotic plaque formation in hyperlipidemic mice
    Thiem, Kathrin ; Hoeke, Geerte ; Berg, Susan van den; Hijmans, Anneke ; Jacobs, Cor W.M. ; Zhou, Enchen ; Mol, Isabel M. ; Mouktaroudi, Maria ; Bussink, Johan ; Kanneganti, Thirumala D. ; Lutgens, Esther ; Stienstra, Rinke ; Tack, Cees J. ; Netea, Mihai G. ; Rensen, Patrick C.N. ; Berbée, Jimmy F.P. ; Diepen, Janna A. van - \ 2019
    Scientific Reports 9 (2019)1. - ISSN 2045-2322

    Inflammatory reactions activated by pattern recognition receptors (PRRs) on the membrane of innate immune cells play an important role in atherosclerosis. Whether the PRRs of the C-type lectin receptor (CLR) family including Dectin-2 may be involved in the pathogenesis of atherosclerosis remains largely unknown. Recently, the CLR-adaptor molecule caspase recruitment domain family member 9 (CARD9) has been suggested to play a role in cardiovascular pathologies as it provides the link between CLR activation and transcription of inflammatory cytokines as well as immune cell recruitment. We therefore evaluated whether hematopoietic deletion of Dectin-2 or CARD9 reduces inflammation and atherosclerosis development. Low-density lipoprotein receptor (Ldlr)-knockout mice were transplanted with bone marrow from wild-type, Dectin-2- or Card9-knockout mice and fed a Western-type diet containing 0.1% (w/w) cholesterol. After 10 weeks, lipid and inflammatory parameters were measured and atherosclerosis development was determined. Deletion of hematopoietic Dectin-2 or CARD9 did not influence plasma triglyceride and cholesterol levels. Deletion of hematopoietic Dectin-2 did not affect atherosclerotic lesion area, immune cell composition, ex vivo cytokine secretion by peritoneal cells or bone marrow derived macrophages. Unexpectedly, deletion of hematopoietic CARD9 increased atherosclerotic lesion formation and lesion severity. Deletion of hematopoietic CARD9 did also not influence circulating immune cell composition and peripheral cytokine secretion. Besides a tendency to a reduced macrophage content within these lesions, plasma MCP-1 levels decreased upon WTD feeding. Deletion of hematopoietic Dectin-2 did not influence atherosclerosis development in hyperlipidemic mice. The absence of CARD9 unexpectedly increased atherosclerotic lesion size and severity, suggesting that the presence of CARD9 may protect against initiation of atherosclerosis development.

    Metabolic improvement in obese patients after duodenal–jejunal exclusion is associated with intestinal microbiota composition changes
    Jonge, C. de; Fuentes, S. ; Zoetendal, E.G. ; Bouvy, N.D. ; Nelissen, R. ; Buurman, W.A. ; Greve, J.W. ; Vos, W.M. de; Rensen, S.S. - \ 2019
    International Journal of Obesity 43 (2019). - ISSN 0307-0565 - p. 2509 - 2517.

    Background: Intestinal microbiota have been suggested to play an important role in the pathogenesis of obesity and type 2 diabetes. Bariatric surgery improves both conditions and has been associated with changes in intestinal microbiota composition. We investigated the effect of a nonsurgical bariatric technique on intestinal microbiota composition in relation to metabolic improvement. Methods: Seventeen patients with obesity and type 2 diabetes were treated with the nonsurgical duodenal–jejunal bypass liner, which excludes the proximal 60 cm small intestine from food. Fecal samples as well as metabolic parameters reflecting obesity and type 2 diabetes were obtained from the patients at baseline, after 6 months with the device in situ, and 6 months after explantation. Results: After 6 months of treatment, both obesity and type 2 diabetes had improved with a decrease in weight from 106.1 [99.4–123.5] to 97.4 [89.4–114.0] kg and a decrease in HbA 1c from 8.5% [7.6–9.2] to 7.2% [6.3–8.1] (both p < 0.05). This was paralleled by an increased abundance of typical small intestinal bacteria such as Proteobacteria, Veillonella, and Lactobacillus spp. in feces. After removal of the duodenal–jejunal bypass liner, fecal microbiota composition was similar to that observed at baseline, despite persistent weight loss. Conclusion: Improvement of obesity and type 2 diabetes after exclusion of the proximal 60 cm small intestine by treatment with a nonsurgical duodenal–jejunal bypass liner may be promoted by changes in fecal microbiota composition.

    IL-37 expression reduces lean body mass in mice by reducing food intake
    Kuipers, Eline N. ; Dam, Andrea D. van; Ballak, Dov B. ; Wit, Ellemiek A. de; Dinarello, Charles A. ; Stienstra, Rinke ; Diepen, Janna A. van; Rensen, Patrick C.N. ; Boon, Mariëtte R. - \ 2018
    International Journal of Molecular Sciences 19 (2018)8. - ISSN 1661-6596
    Energy metabolism - Food intake - High fat diet - IL-37

    The human cytokine interleukin (IL)-37 is an anti-inflammatory member of the IL-1 family of cytokines. Transgenic expression of IL-37 in mice protects them from diet-induced obesity and associated metabolic complications including dyslipidemia, inflammation and insulin resistance. The precise mechanism of action leading to these beneficial metabolic effects is not entirely known. Therefore, we aimed to assess in detail the effect of transgenic IL-37 expression on energy balance, including food intake and energy expenditure. Feeding homozygous IL-37 transgenic mice and wild-type (WT) control mice a high-fat diet (HFD; 45% kcal palm fat) for 6 weeks showed that IL-37 reduced body weight related to a marked decrease in food intake. Subsequent mechanistic studies in mice with heterozygous IL-37 expression versus WT littermates, fed the HFD for 18 weeks, confirmed that IL-37 reduces food intake, which led to a decrease in lean body mass, but did not reduce fat mass and plasma lipid levels or alterations in energy expenditure independent of lean body mass. Taken together, this suggests that IL-37 reduces lean body mass by reducing food intake.

    A Diurnal Rhythm in Brown Adipose Tissue Causes Rapid Clearance and Combustion of Plasma Lipids at Wakening
    Berg, Rosa van den; Kooijman, Sander ; Noordam, Raymond ; Ramkisoensing, Ashna ; Abreu-Vieira, Gustavo ; Tambyrajah, Lauren L. ; Dijk, Wieneke ; Ruppert, Philip ; Mol, Isabel M. ; Kramar, Barbara ; Caputo, Rosanna ; Puig, Laura Sardón ; Ruiter, Evelien M. de; Kroon, Jan ; Hoekstra, Menno ; Sluis, Ronald J. van der; Meijer, Onno C. ; Willems van Dijk, Ko ; Kerkhof, Linda W.M. van; Christodoulides, Constantinos ; Karpe, Fredrik ; Gerhart-Hines, Zachary ; Kersten, Sander ; Meijer, Johanna H. ; Coomans, Claudia P. ; Heemst, Diana van; Biermasz, Nienke R. ; Rensen, Patrick C.N. - \ 2018
    Cell Reports 22 (2018)13. - ISSN 2211-1247 - p. 3521 - 3533.
    angiopoietin-like 4 - APOE3-Leiden.CETP mice - brown adipose tissue - circadian rhythm - diurnal rhythm - fatty acids - lipoprotein lipase - postprandial lipid response - triglycerides
    Many favorable metabolic effects have been attributed to thermogenic activity of brown adipose tissue (BAT). Yet, time of day has rarely been considered in this field of research. Here, we show that a diurnal rhythm in BAT activity regulates plasma lipid metabolism. We observed a high-amplitude rhythm in fatty acid uptake by BAT that synchronized with the light/dark cycle. Highest uptake was found at the onset of the active period, which coincided with high lipoprotein lipase expression and low angiopoietin-like 4 expression by BAT. Diurnal rhythmicity in BAT activity determined the rate at which lipids were cleared from the circulation, thereby imposing the daily rhythm in plasma lipid concentrations. In mice as well as humans, postprandial lipid excursions were nearly absent at waking. We anticipate that diurnal BAT activity is an important factor to consider when studying the therapeutic potential of promoting BAT activity. van den Berg et al. show a strong circadian rhythm in fatty acid uptake by brown adipose tissue that peaks at wakening regardless of the light exposure period. Consequently, postprandial lipid handling by brown adipose tissue is highest at wakening, resulting in the lowest postprandial plasma lipid excursions.
    Metabolic imaging of fatty kidney in diabesity : Validation and dietary intervention
    Jonker, Jacqueline T. ; Heer, Paul De; Engelse, Marten A. ; Rossenberg, Evelien H. Van; Klessens, Celine Q.F. ; Baelde, Hans J. ; Bajema, Ingeborg M. ; Koopmans, Sietse Jan ; Coelho, Paulo G. ; Streefland, Trea C.M. ; Webb, Andrew G. ; Dekkers, Ilona A. ; Rabelink, Ton J. ; Rensen, Patrick C.N. ; Lamb, Hildo J. ; Vries, Aiko P.J. De - \ 2018
    Nephrology Dialysis Transplantation 33 (2018)2. - ISSN 0931-0509 - p. 224 - 230.
    chronic kidney disease - fatty kidney - proton magnetic - renal triglyceride content - resonance spectroscopy - type 2 diabetes mellitus
    Background Obesity and type 2 diabetes have not only been linked to fatty liver, but also to fatty kidney and chronic kidney disease. Since non-invasive tools are lacking to study fatty kidney in clinical studies, we explored agreement between proton magnetic resonance spectroscopy (1 H-MRS) and enzymatic assessment of renal triglyceride content (without and with dietary intervention). We further studied the correlation between fatty kidney and fatty liver. Methods Triglyceride content in the renal cortex was measured by 1 H-MRS on a 7-Tesla scanner in 27 pigs, among which 15 minipigs had been randomized to a 7-month control diet, cafeteria diet (CAF) or CAF with low-dose streptozocin (CAF-S) to induce insulin-independent diabetes. Renal biopsies were taken from corresponding MRS-voxel locations. Additionally, liver biopsies were taken and triglyceride content in all biopsies was measured by enzymatic assay. Results Renal triglyceride content measured by 1 H-MRS and enzymatic assay correlated positively (r = 0.86, P < 0.0001). Compared with control diet-fed minipigs, renal triglyceride content was higher in CAF-S-fed minipigs (137 ± 51 nmol/mg protein, mean ± standard error of the mean, P < 0.05), but not in CAF-fed minipigs (60 ± 10 nmol/mg protein) compared with controls (40 ± 6 nmol/mg protein). Triglyceride contents in liver and kidney biopsies were strongly correlated (r = 0.97, P < 0.001). Conclusions Non-invasive measurement of renal triglyceride content by 1 H-MRS closely predicts triglyceride content as measured enzymatically in biopsies, and fatty kidney appears to develop parallel to fatty liver. 1 H-MRS may be a valuable tool to explore the role of fatty kidney in obesity and type 2 diabetic nephropathy in humans in vivo.
    Short-term cooling increases serum angiopoietin-like 4 levels in healthy lean men
    Nahon, Kimberly J. ; Hoeke, Geerte ; Bakker, Leontine E.H. ; Jazet, Ingrid M. ; Berbée, Jimmy F.P. ; Kersten, Sander ; Rensen, Patrick C.N. ; Boon, Mariëtte R. - \ 2018
    Journal of Clinical Lipidology 12 (2018)1. - ISSN 1933-2874 - p. 56 - 61.
    Angiopoietin-like 4 - Brown adipose tissue - Cold exposure - South Asians - Sympathetic nervous system
    Background: Cold exposure enhances sympathetic outflow to peripheral tissues, thereby stimulating intracellular lipolysis in white adipose tissue and increasing the lipoprotein lipase-dependent uptake and combustion of triglyceride-derived fatty acids (FAs) by brown adipose tissue. Angiopoietin-like 4 (ANGPTL4) inhibits lipoprotein lipase and can be regulated by cold exposure, at least in mice. Objective: In the present study, we examined the effect of short-term mild cooling on serum ANGPTL4 levels in healthy lean men of White Caucasian and South Asian descent. Methods: Healthy, lean White Caucasian (n = 12) and South Asian (n = 12) men were exposed to an individualized cooling protocol for 2 hours. Serum ANGPTL4 levels were measured before and after cooling, and its relation with previously measured parameters (ie, free fatty acid [FFA] levels, body fat percentage, and resting energy expenditure) was determined. Results: Short-term cooling increased ANGPTL4 levels (+17%, P < .001). Thermoneutral ANGPTL4 levels positively correlated with FFA levels (R 2 = 0.250, P < .05) and body fat percentage (R 2 = 0.338, P < .05). Furthermore, ANGPTL4 negatively correlated with resting energy expenditure (R 2 = 0.235, P < .05). The relative increase in ANGPTL4 levels was higher in White Caucasians compared with South Asians (25 ± 4 vs 9 ± 4%, P < .05). Conclusion: Short-term cooling increases ANGPTL4 levels in healthy lean men. We anticipate that FFA liberated from white adipose tissue during cooling increases ANGPTL4 to limit uptake of triglyceride-derived FA by this tissue.
    The effects of selective hematopoietic expression of human IL-37 on systemic inflammation and atherosclerosis in LDLr-deficient mice
    Hoeke, Geerte ; Khedoe, P.P.S.J. ; Diepen, Janna A. Van; Pike-Overzet, Karin ; Ven, Britt van de; Vazirpanah, Nadia ; Mol, Isabel ; Hiemstra, Pieter S. ; Staal, Frank J.T. ; Stienstra, Rinke ; Netea, Mihai G. ; Dinarello, Charles A. ; Rensen, Patrick C.N. ; Berbée, Jimmy F.P. - \ 2017
    International Journal of Molecular Sciences 18 (2017)8. - ISSN 1661-6596
    Atherosclerosis - Hyperlipidemia - Inflammation - Interleukin-37

    The human cytokine interleukin (IL)-37 has potent anti-inflammatory capacities, and hematopoietic cell-specific transgenic overexpression of IL-37 in mice protects against septic shock and colitis. In the present study we investigated the effect of hematopoietic expression of IL-37 on atherosclerosis development under low-grade inflammatory conditions. Low-density lipoprotein receptor (LDLr)-deficient mice were lethally irradiated and transplanted with bone marrow from IL-37-transgenic or control wild-type mice and fed a Western-type diet (WTD; 1% cholesterol) for eight weeks. Metabolic and inflammatory parameters were monitored and atherosclerosis was assessed in the aortic valve area. Hematopoietic IL-37 expression did not influence body weight, food intake and plasma cholesterol levels during the study. Plasma soluble E-selectin levels were increased with WTD-feeding as compared to chow-feeding, but were not influenced by IL-37 expression. IL-37 expression reduced the inflammatory state as indicated by reduced white blood cell counts and by reduced basal and lipopolysaccharide-induced cytokine response by peritoneal macrophages ex vivo. IL-37 expression did not influence the atherosclerotic lesion area. Lesion composition was marginally affected. Smooth muscle cell content was decreased, but macrophage and collagen content were not different. We conclude that under low-grade inflammatory conditions, hematopoietic IL-37 expression reduces the inflammatory state, but does not influence atherosclerosis development in hyperlipidemic LDLr-deficient mice.

    ANGPTL4 mediates shuttling of lipid fuel to brown adipose tissue during sustained cold exposure
    Dijk, Wieneke ; Heine, Markus ; Vergnes, Laurent ; Boon, Mariëtte R. ; Schaart, Gert ; Hesselink, Matthijs K.C. ; Reue, Karen ; Marken Lichtenbelt, Wouter D. van; Olivecrona, Gunilla ; Rensen, Patrick C.N. ; Heeren, Joerg ; Kersten, Sander - \ 2015
    eLife 4 (2015). - ISSN 2050-084X - 23 p.

    Brown adipose tissue (BAT) activation via cold exposure is increasingly scrutinized as a potential approach to ameliorate cardio-metabolic risk. Transition to cold temperatures requires changes in the partitioning of energy substrates, re-routing fatty acids to BAT to fuel non-shivering thermogenesis. However, the mechanisms behind the redistribution of energy substrates to BAT remain largely unknown. Angiopoietin-like 4 (ANGPTL4), a protein that inhibits lipoprotein lipase (LPL) activity, is highly expressed in BAT. Here, we demonstrate that ANGPTL4 is part of a shuttling mechanism that directs fatty acids derived from circulating triglyceride-rich lipoproteins to BAT during cold. Specifically, we show that cold markedly down-regulates ANGPTL4 in BAT, likely via activation of AMPK, enhancing LPL activity and uptake of plasma triglyceride-derived fatty acids. In contrast, cold up-regulates ANGPTL4 in WAT, abolishing a cold-induced increase in LPL activity. Together, our data indicate that ANGPTL4 is an important regulator of plasma lipid partitioning during sustained cold.

    Brown adipose tissue takes up plasma triglycerides mostly after lipolysis
    Khedoe, P.P.S.J. ; Hoeke, Geerte ; Kooijman, Sander ; Dijk, Wieneke ; Buijs, Jeroen T. ; Kersten, Sander ; Havekes, Louis M. ; Hiemstra, Pieter S. ; Berbée, Jimmy F.P. ; Boon, Mariëtte R. ; Rensen, Patrick C.N. - \ 2015
    Journal of Lipid Research 56 (2015)1. - ISSN 0022-2275 - p. 51 - 59.
    Cholesterol - Chylomicrons - Fatty acid metabolism - Lipids - Lipoprotein lipase - Lipoproteins/metabolism

    Brown adipose tissue (BAT) produces heat by burning TGs that are stored within intracellular lipid droplets and need to be replenished by the uptake of TG-derived FA from plasma. It is currently unclear whether BAT takes up FA via uptake of TG-rich lipoproteins (TRLs), after lipolysis-mediated liberation of FA, or via a combination of both. Therefore, we generated glycerol tri[3H]oleate and [14C]cholesteryl oleate double-labeled TRL-mimicking particles with an average diameter of 45, 80, and 150 nm (representing small VLDL to chylomicrons) and injected these intravenously into male C57Bl/6J mice. At room temperature (21°C), the uptake of 3H-activity by BAT, expressed per gram of tissue, was much higher than the uptake of 14C-activity, irrespective of particle size, indicating lipolysis-mediated uptake of TG-derived FA rather than whole particle uptake. Cold exposure (7°C) increased the uptake of FA derived from the differently sized particles by BAT, while retaining the selectivity for uptake of FA over cholesteryl ester (CE). At thermoneutrality (28°C), total FA uptake by BAT was attenuated, but the specificity of uptake of FA over CE was again largely retained. Altogether, we conclude that, in our model, BAT takes up plasma TG preferentially by means of lipolysis-mediated uptake of FA.

    Navigating through metaproteomics data : A logbook of database searching
    Muth, Thilo ; Kolmeder, C.A. ; Salojärvi, Jarkko ; Keskitalo, Salla ; Varjosalo, Markku ; Verdam, F.J. ; Rensen, S.S. ; Reichl, Udo ; Vos, W.M. de; Rapp, Erdmann ; Martens, Lennart - \ 2015
    Proteomics 15 (2015)20. - ISSN 1615-9853 - p. 3439 - 3453.
    Bioinformatics - De novo sequencing - False discovery rate - Metaproteomics - Search parameters

    Metaproteomic research involves various computational challenges during the identification of fragmentation spectra acquired from the proteome of a complex microbiome. These issues are manifold and range from the construction of customized sequence databases, the optimal setting of search parameters to limitations in the identification search algorithms themselves. In order to assess the importance of these individual factors, we studied the effect of strategies to combine different search algorithms, explored the influence of chosen database search settings, and investigated the impact of the size of the protein sequence database used for identification. Furthermore, we applied de novo sequencing as a complementary approach to classic database searching. All evaluations were performed on a human intestinal metaproteome dataset. Pyrococcus furiosus proteome data were used to contrast database searching of metaproteomic data to a classic proteomic experiment. Searching against subsets of metaproteome databases and the use of multiple search engines increased the number of identifications. The integration of P. furiosus sequences in a metaproteomic sequence database showcased the limitation of the target-decoy-controlled false discovery rate approach in combination with large sequence databases. The selection of varying search engine parameters and the application of de novo sequencing represented useful methods to increase the reliability of the results. Based on our findings, we provide recommendations for the data analysis that help researchers to establish or improve analysis workflows in metaproteomics.

    Caspase-1 deficiency reduces intestinal and hepatic triglyceride-rich lipoprotein secretion
    Diepen, Janna A. van; Stienstra, Rinke ; Hooiveld, Guido ; Willems van Dijk, Ko ; Rensen, Patrick C. - \ 2013
    Wageningen University
    Mus musculus - GSE32515 - PRJNA147849 - Mus musculus - GSE32515
    Background and Aims: Inflammasome-mediated caspase-1 activity regulates the maturation and release of the pro-inflammatory cytokines interleukin (IL)-1ß and IL-18. Recently, we showed that caspase-1 deficiency strongly reduces high fat diet-induced adiposity although the mechanism is still unclear. We now aimed to elucidate the mechanism by which caspase-1 deficiency reduces modulates resistance to high fat diet-feeding fat accumulation in adipose tissue by focusing on the role of caspase-1 in the regulation of triglyceride (TG)-rich lipoprotein metabolism. Methods: Caspase-1 deficient and wild-type mice (both C57Bl/6 background) were used to determine postprandial TG kinetics, intestinal TG absorption, VLDL-TG production as well as TG clearance, all of which strongly contribute to the supply of TG for storage in adipose tissue. Micro-array and qPCR analysis were used to unravel intestinal and hepatic metabolic pathways involved. Results: Caspase-1 deficiency reduced the postprandial response to an oral lipid load, while tissue specific clearance of TG-rich lipoproteins was not changed. Indeed, an oral olive oil gavage containing [3H]TG revealed that caspase-1 deficiency significantly decreased intestinal chylomicron-TG production and reduced the uptake of [3H]TG-derived FA by liver, muscle, and adipose tissue. Similarly, caspase-1 deficiency reduced the hepatic VLDL-TG production without reducing VLDL-apoB production, despite an elevated hepatic TG content. Pathway analysis revealed that caspase-1 deficiency reduces intestinal and hepatic expression of genes involved in lipogenesis. Conclusions: Absence of caspase-1 reduces assembly and secretion of TG-rich lipoproteins, thereby reducing the availability of TG-derived FA for uptake by peripheral organs including adipose tissue. We anticipate that caspase-1 represents a novel link between innate immunity and lipid metabolism.
    Dietary modulation of plasma angiopoietin-like protein 4 concentrations in healthy volunteers and in patients with type 2 diabetes
    Jonker, J.T. ; Smit, J.W.A. ; Hammer, S. ; Snel, M. ; Meer, R. van der; Lamb, H.J. ; Mattijssen, F.B.J. ; Mudde, C.M. ; Jazet, I.M. ; Dekkers, O.M. ; Roos, A. de; Romijn, J.A. ; Kersten, A.H. ; Rensen, P.C.N. - \ 2013
    American Journal of Clinical Nutrition 97 (2013)2. - ISSN 0002-9165 - p. 255 - 260.
    myocardial triglyceride content - free fatty-acids - lipoprotein-lipase - caloric restriction - diastolic function - angptl4 - mice - hyperlipidemia - inhibition - humans
    Background: Angiopoietin-like protein 4 (ANGPTL4) has been identified as an inhibitor of lipoprotein lipase. Preliminary data suggest that plasma nonesterified fatty acids (NEFAs) raise plasma ANGPTL4 concentrations in humans. Objective: The objective was to assess plasma ANGPTL4 concentrations after various nutritional interventions that increase NEFA concentrations in healthy subjects and in patients with type 2 diabetes mellitus. Design: We studied 4 groups, both at baseline and after 3 d of either fasting (n = 22 healthy men), a very-low-calorie diet (VLCD; n = 10 healthy men and n = 10 patients with diabetes), or a high-fat, high-energy diet (HFED; n = 15 healthy men). Plasma ANGPTL4, NEFA, and triglyceride concentrations were measured. Results: In healthy men, a VLCD increased ANGPTL4 from 13.2 (IQR: 8.1-24.2) at baseline to 18.2 (16.7-33.4) ng/mL (P <0.05), fasting increased ANGPTL4 from 10.6 (7.6-17.6) to 28.0 (23.1-35.0) ng/mL (P <0.05), and an HFED increased ANGPTL4 from 13.9 (8.2-22.0) to 17.2 (11.2-23.6) ng/mL (P <0.05). In men with diabetes, a VLCD also increased ANGPTL4, from 10.9 +/- 2.4 to 19.2 +/- 3.2 ng/mL (P <0.05). All interventions significantly increased plasma NEFAs in both healthy men and patients with diabetes. The change in ANGPTL4 positively correlated with the change in NEFA concentrations (beta = 0.048, P <0.001) and negatively correlated with the change in plasma triglycerides (beta = -0.051, P = 0.01). Conclusions: Three days of either fasting, a VLCD, or an HFED increased plasma ANGPTL4 concentrations in healthy men, concomitantly with increased plasma NEFA concentrations. Similarly, a VLCD in patients with diabetes increased ANGPTL4 concentrations, concomitantly with increased NEFA concentrations. Am J Clin Nutr 2013;97:255-60.
    Caspase-1 deficiency in mice reduces intestinal triglyceride absorption and hepatic triglyceride secretion
    Diepen, J.A. van; Stienstra, R. ; Vroegrijk, I.O.C.M. ; Berg, S.A.A. van den; Salvatori, D. ; Hooiveld, G.J.E.J. ; Kersten, A.H. ; Tack, C.J. ; Netea, M.G. ; Smit, J.W.A. ; Joosten, L.A.B. ; Havekes, L.M. ; Dijk, K.W. van; Rensen, P.C.N. - \ 2013
    Journal of Lipid Research 54 (2013)2. - ISSN 0022-2275 - p. 448 - 456.
    lipid-metabolism - adipose-tissue - fatty-acids - lipoprotein metabolism - insulin-resistance - immune-responses - inflammation - liver - inflammasomes - interleukin-1
    Caspase-1 is known to activate the proinflammatory cytokines IL-1 beta and IL-18. Additionally, it can cleave other substrates, including proteins involved in metabolism. Recently, we showed that caspase-1 deficiency in mice strongly reduces high-fat diet-induced weight gain, at least partly caused by an increased energy production. Increased feces secretion by caspase-1-deficient mice suggests that lipid malabsorption possibly further reduces adipose tissue mass. In this study we investigated whether caspase-1 plays a role in triglyceride-(TG)-rich lipoprotein metabolism using caspase-1-deficient and wild-type mice. Caspase-1 deficiency reduced the postprandial TG response to an oral lipid load, whereas TG-derived fatty acid (FA) uptake by peripheral tissues was not affected, demonstrated by unaltered kinetics of [H-3] TG-labeled very low-density lipoprotein (VLDL)-like emulsion particles. An oral gavage of [H-3] TG-containing olive oil revealed that caspase-1 deficiency reduced TG absorption and subsequent uptake of TG-derived FA in liver, muscle, and adipose tissue. Similarly, despite an elevated hepatic TG content, caspase-1 deficiency reduced hepatic VLDL-TG production. Intestinal and hepatic gene expression analysis revealed that caspase-1 deficiency did not affect FA oxidation or FA uptake but rather reduced intracellular FA transport, thereby limiting lipid availability for the assembly and secretion of TG-rich lipoproteins.(jlr) The current study reveals a novel function for caspase-1, or caspase-1-cleaved substrates, in controlling intestinal TG absorption and hepatic TG secretion.-van Diepen, J. A., R. Stienstra, I. O. C. M. Vroegrijk, S. A. A. van den Berg, D. Salvatori, G. J. Hooiveld, S. Kersten, C. J. Tack, M. G. Netea, J. W. A. Smit, L. A. B. Joosten, L. M. Havekes, K. W. van Dijk, and P. C. N. Rensen. Caspase-1 deficiency in mice reduces intestinal triglyceride absorption and hepatic triglyceride secretion. J. Lipid Res. 2013. 54: 448-456.
    Overexpression of angiopoietin-like protein 4 protects against atherosclerosis development
    Georgiadi, A. ; Wang, Y. ; Stienstra, R. ; Tjeerdema, N. ; Janssen, A. ; Stalenhoef, A. ; Vliet, A. van der; Roos, J.A. de; Tamsma, J.T. ; Smit, J.W. ; Tan, N.S. ; Müller, M.R. ; Rensen, P.C. ; Kersten, A.H. - \ 2013
    Arteriosclerosis Thrombosis and Vascular Biology 33 (2013)7. - ISSN 1079-5642 - p. 1529 - 1537.
    low-density-lipoprotein - mouse peritoneal-macrophages - foam cell-formation - transgenic mice - lipase - angptl4 - expression - gene - hyperlipoproteinemia - hyperlipidemia
    Objective—Macrophage foam cells play a crucial role in several pathologies including multiple sclerosis, glomerulosclerosis, and atherosclerosis. Angiopoietin-like protein 4 (Angptl4) was previously shown to inhibit chyle-induced foam cell formation in mesenteric lymph nodes. Here we characterized the regulation of Angptl4 expression in macrophages and examined the impact of Angptl4 on atherosclerosis development. Approach and Results—Macrophage activation elicited by pathogen-recognition receptor agonists decreased Angptl4 expression, whereas lipid loading by intralipid and oxidized low-density lipoprotein increased Angptl4 expression. Consistent with an antilipotoxic role of Angptl4, recombinant Angptl4 significantly decreased uptake of oxidized low-density lipoprotein by macrophages, via lipolysis-dependent and -independent mechanisms. Angptl4 protein was detectable in human atherosclerotic lesions and localized to macrophages. Transgenic overexpression of Angptl4 in atherosclerosis-prone apolipoprotein E*3-Leiden mice did not significantly alter plasma cholesterol and triglyceride levels. Nevertheless, Angptl4 overexpression reduced lesion area by 34% (P
    Human intestinal microbiota composition is associated with local and systemic inflammation in obesity
    Verdam, F.J. ; Fuentes Enriquez de Salamanca, S. ; Jonge, C. de; Zoetendal, E.G. ; Erbil, R. ; Greve, J.W. ; Buurman, W.A. ; Vos, W.M. de; Rensen, S.S. - \ 2013
    Obesity 21 (2013)12. - ISSN 1930-7381 - p. E607 - E615.
    human gut microbiota - diet-induced obesity - high-fat diet - fecal calprotectin - nonalcoholic steatohepatitis - weight-loss - bowel - mice - permeability - disease
    OBJECTIVE: Intestinal microbiota have been suggested to contribute to the development of obesity, but the mechanism remains elusive. The relationship between microbiota composition, intestinal permeability, and inflammation in nonobese and obese subjects was investigated. DESIGN AND METHODS: Fecal microbiota composition of 28 subjects (BMI 18.6-60.3 kg m-2 ) was analyzed by a phylogenetic profiling microarray. Fecal calprotectin and plasma C-reactive protein levels were determined to evaluate intestinal and systemic inflammation. Furthermore, HbA1c , and plasma levels of transaminases and lipids were analyzed. Gastroduodenal, small intestinal, and colonic permeability were assessed by a multisaccharide test. RESULTS: Based on microbiota composition, the study population segregated into two clusters with predominantly obese (15/19) or exclusively nonobese (9/9) subjects. Whereas intestinal permeability did not differ between clusters, the obese cluster showed reduced bacterial diversity, a decreased Bacteroidetes/Firmicutes ratio, and an increased abundance of potential proinflammatory Proteobacteria. Interestingly, fecal calprotectin was only detectable in subjects within the obese microbiota cluster (n = 8/19, P = 0.02). Plasma C-reactive protein was also increased in these subjects (P = 0.0005), and correlated with the Bacteroidetes/Firmicutes ratio (rs = -0.41, P = 0.03). CONCLUSIONS: Intestinal microbiota alterations in obese subjects are associated with local and systemic inflammation, suggesting that the obesity-related microbiota composition has a proinflammatory effect
    Zoutverlaging vleeswaren kan alleen in stappen
    Rensen, E. ; Janssen, A.M. - \ 2012
    Vlees Magazine (Industriespecial) 2012 (2012)December. - ISSN 2214-1170 - p. 32 - 34.
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