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Bart L van de Bank, Marnix C Maas, Lauren J Bains, Arend Heerschap, Tom W J Scheenen
Phosphorus magnetic resonance spectroscopy (31 P MRS) has been employed before to assess phosphocreatine (PCr) and other high-energy phosphates in the visual cortex during visual stimulation with inconsistent results. We performed functional31 P MRS imaging in the visual cortex and control regions during a visual stimulation paradigm at an unprecedented sensitivity, exploiting a dedicated RF coil design at a 7 T MR system. Visual stimulation in a 3 min 24 s on-off paradigm in eight young healthy adults generated a clear BOLD effect with traditional1 H functional MRI in the visual cortex (average z score 9...
March 23, 2018: Brain Structure & Function
Andreas Boss, Linda Heskamp, Vincent Breukels, Lauren J Bains, Mark J van Uden, Arend Heerschap
The rate of phosphocreatine (PCr) recovery (kPCr ) after exercise, characterizing muscle oxidative capacity, is traditionally assessed with unlocalized31 P magnetic resonance spectroscopy (MRS) using a single surface coil. However, because of intramuscular variation in fibre type and oxygen supply, kPCr may be non-uniform within muscles. We tested this along the length of the tibialis anterior (TA) muscle in 10 male volunteers. For this purpose we employed a 3T MR system with a31 P/1 H volume transmit coil combined with a home-built31 P phased-array receive probe, consisting of 5 coil elements covering the TA muscle length...
February 18, 2018: Journal of Physiology
Sanne Arjaans, Elvira A H Zwart, Mark-Jan Ploegstra, Arend F Bos, Elisabeth M W Kooi, Hans L Hillege, Rolf M F Berger
BACKGROUND: Pulmonary hypertension complicates the clinical course of extremely preterm infants and is associated with bronchopulmonary dysplasia (BPD). However, prevalence, risk factors, and outcome of pulmonary hypertension in these infants are insufficiently known. This systematic review and meta-analysis aims to provide an up-to-date overview of available data on prevalence, risk factors, and outcome of pulmonary hypertension and to identify current knowledge gaps. METHODS: Medline, EMBASE, and the Cochrane Library databases were searched in July 2017...
January 17, 2018: Paediatric and Perinatal Epidemiology
Premraj Rajkumar, Boyoung Cha, Jianyi Yin, Lois J Arend, Teodor G Păunescu, Yoshio Hirabayashi, Mark Donowitz, Jennifer L Pluznick
The investigation of orphan GPCRs (GPRs) has the potential to uncover novel insights into whole animal physiology. In this study, our goal was to determine the renal localization of Gprc5c, a receptor that we previously reported to be highly expressed in murine whole kidney, and to examine physiologic parameters in Gprc5c knockout (KO) mice to gain insight into function. Gprc5c localized to the apical membrane of renal proximal tubules (PTs) in mice, rats, and humans. With the comparison of Gprc5c wild-type (WT) and KO mice, we found that Gprc5c KO mice have altered acid-base homeostasis...
January 5, 2018: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
C Witte, J U Meyer Zur Heide Genannt Meyer-Arend, R Andrié, J W Schrickel, C Hammerstingl, J O Schwab, G Nickenig, D Skowasch, C Pizarro
A growing body of evidence indicates that sudden cardiac death constitutes a major cause of mortality in pulmonary hypertension (PH). As validated method to evaluate cardiac autonomic system dysfunction, alterations in heart rate variability (HRV) are predictive of arrhythmic events, particularly in left ventricular disease. Here, we sought to determine the clinical value of HRV assessment in PH. Sixty-four patients were allocated to different PH-subgroups in this prospectively conducted trial: 25 patients with pulmonary arterial hypertension (PAH), 11 patients with chronic thromboembolic PH (CTEPH), and 28 patients with COPD-induced PH...
2016: Advances in Experimental Medicine and Biology
M Rousié, V Douillez, S Arend, Ph Arend
BACKGROUND: We evaluated clinical outcomes of EVAR procedures at a low-volume center in Belgium. We also analyzed the time before endoleak appeared. METHODS: We reviewed 77 EVAR procedures performed over 10 years in a low-volume center. Patients were reviewed at intervals of 1, 3, 6, 12, 24 and 36 months. RESULTS: The deployment of the endograft was successful for 76 of the 77 patients (98.7%). Perioperative mortality was 1.3%. Cardiac infarctus was reported in 5...
November 2015: Acta Chirurgica Belgica
Michael Rothballer, Matthieu Picot, Tina Sieper, Jan B A Arends, Michael Schmid, Anton Hartmann, Nico Boon, Cees J N Buisman, Frédéric Barrière, David P B T B Strik
Several mixed microbial communities have been reported to show robust bioelectrocatalysis of oxygen reduction over time at applicable operation conditions. However, clarification of electron transfer mechanism(s) and identification of essential micro-organisms have not been realised. Therefore, the objective of this study was to shape oxygen reducing biocathodes with different microbial communities by means of surface modification using the electrochemical reduction of two different diazonium salts in order to discuss the relation of microbial composition and performance...
December 2015: Bioelectrochemistry
Annelies Geirnaert, Alix Steyaert, Venessa Eeckhaut, Bo Debruyne, Jan B A Arends, Filip Van Immerseel, Nico Boon, Tom Van de Wiele
Butyrate has several beneficial properties that are essential to maintain gastrointestinal health. Therefore butyrate-producing bacteria are seen as the next generation of probiotics. The butyrate-producing bacterium Butyricicoccus pullicaecorum (a clostridial cluster IV strain) is such a promising probiotic candidate for people suffering from inflammatory bowel disease. To exert its beneficial properties, it is crucial that B. pullicaecorum survives the harsh conditions of the upper gastrointestinal tract to arrive in the colon in a viable and metabolically active state...
December 2014: Anaerobe
Grace Salsbury, Emma L Cambridge, Zoe McIntyre, Mark J Arends, Natasha A Karp, Christopher Isherwood, Carl Shannon, Yvette Hooks, Ramiro Ramirez-Solis, David J Adams, Jacqueline K White, Anneliese O Speak
Iron homeostasis is a dynamic process that is tightly controlled to balance iron uptake, storage, and export. Reduction of dietary iron from the ferric to the ferrous form is required for uptake by solute carrier family 11 (proton-coupled divalent metal ion transporters), member 2 (Slc11a2) into the enterocytes. Both processes are proton dependent and have led to the suggestion of the importance of acidic gastric pH for the absorption of dietary iron. Potassium voltage-gated channel subfamily E, member 2 (KCNE2), in combination with potassium voltage-gated channel, KQT-like subfamily, member 1 (KCNQ1), form a gastric potassium channel essential for gastric acidification...
December 2014: Experimental Hematology
Maarten Schurink, Iemcke G H Scholten, Elisabeth M W Kooi, Christian V Hulzebos, Rozemarijn G Kox, Henk Groen, Erik Heineman, Arend F Bos, Jan B F Hulscher
BACKGROUND: Intestinal fatty acid-binding protein (I-FABP) is a promising marker for necrotizing enterocolitis (NEC). It can be measured in plasma (I-FABPp) and urine (I-FABPu). Data on the best way to measure I-FABP (in plasma or urine) and the necessity of simultaneous measurement of the urinary creatinine concentration to correct for physiological variations in urine concentration are not available. This holds also true for the reciprocal relation between I-FABPp, I-FABPu and other more conventional laboratory parameters...
2014: Neonatology
Miriam W Lagemaat, Eline K Vos, Marnix C Maas, Andreas K Bitz, Stephan Orzada, Mark J van Uden, Thiele Kobus, Arend Heerschap, Tom W J Scheenen
OBJECTIVES: The aim of this study was to identify characteristics of phosphorus (P) spectra of the human prostate and to investigate changes of individual phospholipid metabolites in prostate cancer through in vivo P magnetic resonance spectroscopic imaging (MRSI) at 7 T. MATERIALS AND METHODS: In this institutional review board-approved study, 15 patients with biopsy-proven prostate cancer underwent T2-weighted magnetic resonance imaging and 3-dimensional P MRSI at 7 T...
May 2014: Investigative Radiology
Arend Vogt, Jonas Wietek, Peter Hegemann
We studied the photocurrents of a cyanobacterial rhodopsin Gloeobacter violaceus (GR) in Xenopus laevis oocytes and HEK-293 cells. This protein is a light-driven proton pump with striking similarities to marine proteorhodopsins, including the D121-H87 cluster of the retinal Schiff base counterion and a glutamate at position 132 that acts as a proton donor for chromophore reprotonation during the photocycle. Interestingly, at low extracellular pH(o) and negative voltage, the proton flux inverted and directed inward...
November 5, 2013: Biophysical Journal
S J Arends, J G M C Damoiseaux, A M Duijvestijn, L Debrus-Palmans, M Vroomen, K A Boomars, H-P Brunner-La Rocca, C P M Reutelingsperger, J W Cohen Tervaert, P van Paassen
Endothelial cell (EC) apoptosis seems to play an important role in the pathophysiology of pulmonary arterial hypertension (PAH). We aimed to test the hypothesis that circulating anti-endothelial cell antibodies (AECA) of PAH patients induce EC apoptosis. Immunoglobulin (Ig)G was purified from sera of PAH patients (n = 26), patients with systemic lupus erythematosus (SLE) nephritis without PAH (n = 16), patients with systemic sclerosis (SSc) without PAH (n = 58) and healthy controls (n = 14)...
December 2013: Clinical and Experimental Immunology
M S Günthardt-Goerg, T M Kuster, M Arend, P Vollenweider
Three Central European oak species, with four provenances each, were experimentally tested in 16 large model ecosystem chambers for their response to passive air warming (AW, ambient +1-2 °C), drought (D, -43 to -60% irrigation) and their combination (AWD) for 3 years on two forest soil types of pH 4 or 7. Throughout the entire experiment, the influence of the different ambient and experimental climates on the oak trees was strong. The morphological traits of the Quercus species were affected in opposing ways in AW and D treatments, with a neutral effect in the AWD treatment...
January 2013: Plant Biology
Vincent Stroobant, Nathalie Demotte, Rosalie M Luiten, Ralf M Leonhardt, Peter Cresswell, Aude Bonehill, Alexandre Michaux, Wenbin Ma, Arend Mulder, Benoît J Van den Eynde, Pierre van der Bruggen, Nathalie Vigneron
Antitumor cytolytic T lymphocytes (CTLs) recognize peptides derived from cellular proteins and presented on MHC class I. One category of peptides recognized by these CTLs is derived from proteins encoded by "cancer-germline" genes, which are specifically expressed in tumors, and therefore represent optimal targets for cancer immunotherapy. Here, we identify an antigenic peptide, which is derived from the MAGE-A1-encoded protein (160-169) and presented to CTLs by HLA-B*44:02. Although this peptide is encoded by MAGE-A1, processed endogenously and presented by tumor cells, the corresponding synthetic peptide is hardly able to sensitize target cells to CTL recognition when pulsed exogenously...
June 2012: European Journal of Immunology
Brandon D Fennell, Julia M Warren, Kevin K Chung, Hannah L Main, Andrew B Arend, Anna Tochowicz, Marion G Götz
This research investigates the synthesis and inhibitory potency of a series of novel dipeptidyl allyl sulfones as clan CA cysteine protease inhibitors. The structure of the inhibitors consists of a R(1)-Phe-R(2)-AS-Ph scaffold (AS = allyl sulfone). R(1) was varied with benzyloxycarbonyl, morpholinocarbonyl, or N-methylpiperazinocarbonyl substituents. R(2) was varied with either Phe of Hfe residues. Synthesis involved preparation of vinyl sulfone analogues followed by isomerization to allyl sulfones using n-butyl lithium and t-butyl hydroperoxide...
June 2013: Journal of Enzyme Inhibition and Medicinal Chemistry
Rosa Laura E van Loon, Marcus T R Roofthooft, Hans L Hillege, Arend D J ten Harkel, Magdalena van Osch-Gevers, Tammo Delhaas, Livia Kapusta, Jan L M Strengers, Lukas Rammeloo, Sally-Ann B Clur, Barbara J M Mulder, Rolf M F Berger
BACKGROUND: Incidence and prevalence rates for pediatric pulmonary hypertension (PH) and pulmonary arterial hypertension (PAH) are unknown. This study describes the nationwide epidemiological features of pediatric PH in the Netherlands during a 15-year period and the clinical course of pediatric PAH. METHODS AND RESULTS: Two registries were used to retrospectively identify children (0-17 years) with PH. Overall, 3263 pediatric patients were identified with PH due to left heart disease (n=160; 5%), lung disease/hypoxemia (n=253; 8%), thromboembolic disease (n=5; <1%), and transient (n=2691; 82%) and progressive (n=154; 5%) PAH...
October 18, 2011: Circulation
Juan Codina, Timothy S Opyd, Zachary B Powell, Cristina M Furdui, Snezana Petrovic, Raymond B Penn, Thomas D DuBose
The H(+)-K(+)-ATPase α-subunit (HKα(2)) participates importantly in systemic acid-base homeostasis and defends against metabolic acidosis. We have previously shown that HKα(2) plasma membrane expression is regulated by PKA (Codina J, Liu J, Bleyer AJ, Penn RB, DuBose TD Jr. J Am Soc Nephrol 17: 1833-1840, 2006) and in a separate study demonstrated that genetic ablation of the proton-sensing G(s)-coupled receptor GPR4 results in spontaneous metabolic acidosis (Sun X, Yang LV, Tiegs BC, Arend LJ, McGraw DW, Penn RB, Petrovic S...
September 2011: American Journal of Physiology. Renal Physiology
Aida Hiseni, Isabel W C E Arends, Linda G Otten
Two carotenoid 1,2-hydratase (CrtC) genes from the photosynthetic bacteria Rubrivivax gelatinosus and Thiocapsa roseopersicina were cloned and expressed in Escherichia coli in an active form and purified by affinity chromatography. The biochemical properties of the recombinant enzymes and their substrate specificities were studied. The purified CrtCs catalyze cofactor independently the conversion of lycopene to 1-HO- and 1,1'-(HO)(2)-lycopene. The optimal pH and temperature for hydratase activity was 8.0 and 30°C, respectively...
August 2011: Applied Microbiology and Biotechnology
Xuming Sun, Li V Yang, Brian C Tiegs, Lois J Arend, Dennis W McGraw, Raymond B Penn, Snezana Petrovic
Proton receptors are G protein-coupled receptors that accept protons as ligands and function as pH sensors. One of the proton receptors, GPR4, is relatively abundant in the kidney, but its potential role in acid-base homeostasis is unknown. In this study, we examined the distribution of GPR4 in the kidney, its function in kidney epithelial cells, and the effects of its deletion on acid-base homeostasis. We observed GPR4 expression in the kidney cortex, in the outer and inner medulla, in isolated kidney collecting ducts, and in cultured outer and inner medullary collecting duct cells (mOMCD1 and mIMCD3)...
October 2010: Journal of the American Society of Nephrology: JASN
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