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排序方式: 共有5039条查询结果,搜索用时 10 毫秒
101.
Chloé Cloteau Gaud Dervilly Zied Kaabia Florian Bagilet Vivian Delcourt Benoit Loup Yann Guitton Anne-Lise Royer Fabrice Monteau Patrice Garcia Marie-Agnès Popot Bruno Le Bizec Ludovic Bailly-Chouriberry 《Drug testing and analysis》2022,14(5):864-878
In order to overcome the challenge associated with the screening of Anabolic-Androgenic Steroids abuses in animal competitions, a non-targeted liquid chromatography coupled to high resolution mass spectrometry based metabolomics approach was implemented on equine urine samples to highlight potential biomarkers associated with the administration of such compounds, using testosterone esters as model steroids. A statistical model relying on four potential biomarkers intensity could be defined to predict the status of the samples. With a routine application perspective, the monitoring of the highlighted potential biomarkers was first transferred into high-throughput liquid chromatography-selected reaction monitoring (LC-SRM). The model's performances and robustness of the approach were preserved and providing a first demonstration of metabolomics-based biomarkers integration within a targeted workflow using common benchtop MS instrumentation. In addition, with a view to the widespread implementation of such biomarker-based tools, we have transferred the method to a second laboratory with similar instrumentation. This proof of concept allows the development and application of biomarker-based strategies to meet current doping control needs. 相似文献
102.
103.
104.
Benoit D Decruyenaere J Depuydt P Colpaert K 《Lancet》2004,363(9403):170; author reply 170-170; author reply 171
105.
106.
107.
Kang H. Zheng Sotirios Tsimikas Tania Pawade Jeffrey Kroon William S.A. Jenkins Mhairi K. Doris Audrey C. White Nyanza K.L.M. Timmers Jesper Hjortnaes Maximillian A. Rogers Elena Aikawa Benoit J. Arsenault Joseph L. Witztum David E. Newby Marlys L. Koschinsky Zahi A. Fayad Erik S.G. Stroes S. Matthijs Boekholdt Marc R. Dweck 《Journal of the American College of Cardiology》2019,73(17):2150-2162
Background
Lipoprotein(a) [Lp(a)], a major carrier of oxidized phospholipids (OxPL), is associated with an increased incidence of aortic stenosis (AS). However, it remains unclear whether elevated Lp(a) and OxPL drive disease progression and are therefore targets for therapeutic intervention.Objectives
This study investigated whether Lp(a) and OxPL on apolipoprotein B-100 (OxPL-apoB) levels are associated with disease activity, disease progression, and clinical events in AS patients, along with the mechanisms underlying any associations.Methods
This study combined 2 prospective cohorts and measured Lp(a) and OxPL-apoB levels in patients with AS (Vmax >2.0 m/s), who underwent baseline 18F-sodium fluoride (18F-NaF) positron emission tomography (PET), repeat computed tomography calcium scoring, and repeat echocardiography. In vitro studies investigated the effects of Lp(a) and OxPL on valvular interstitial cells.Results
Overall, 145 patients were studied (68% men; age 70.3 ± 9.9 years). On baseline positron emission tomography, patients in the top Lp(a) tertile had increased valve calcification activity compared with those in lower tertiles (n = 79; 18F-NaF tissue-to-background ratio of the most diseased segment: 2.16 vs. 1.97; p = 0.043). During follow-up, patients in the top Lp(a) tertile had increased progression of valvular computed tomography calcium score (n = 51; 309 AU/year [interquartile range: 142 to 483 AU/year] vs. 93 AU/year [interquartile range: 56 to 296 AU/year; p = 0.015), faster hemodynamic progression on echocardiography (n = 129; 0.23 ± 0.20 m/s/year vs. 0.14 ± 0.20 m/s/year] p = 0.019), and increased risk for aortic valve replacement and death (n = 145; hazard ratio: 1.87; 95% CI: 1.13 to 3.08; p = 0.014), compared with lower tertiles. Similar results were noted with OxPL-apoB. In vitro, Lp(a) induced osteogenic differentiation of valvular interstitial cells, mediated by OxPL and inhibited with the E06 monoclonal antibody against OxPL.Conclusions
In patients with AS, Lp(a) and OxPL drive valve calcification and disease progression. These findings suggest lowering Lp(a) or inactivating OxPL may slow AS progression and provide a rationale for clinical trials to test this hypothesis. 相似文献108.
Opening of ATP-sensitive potassium channels causes generation of free radicals in vascular smooth muscle cells 总被引:4,自引:2,他引:4
Krenz M Oldenburg O Wimpee H Cohen MV Garlid KD Critz SD Downey JM Benoit JN 《Basic research in cardiology》2002,97(5):365-373
Recent evidence suggests that opening of mitochondrial KATP channels in cardiac muscle triggers the preconditioning phenomenon through free radical production. The present study tested
the effects of KATP channel openers in a vascular smooth muscle cell model using the fluorescent probe MitoTracker (MTR) Red™ for detection of
reactive oxygen species (ROS). Rat aortic smooth muscle cells (A7r5) were incubated with 1 μM reduced MTR (non-fluorescent)
and the MTR oxidation product (fluorescent) was quantified. Thirty-minute pretreatment with either diazoxide (200 μM) or pinacidil
(100 μM), both potent mitochondrial KATP channel openers, increased fluorescent intensity (FI) to 149 and 162 % of control (p < 0.05 for both), respectively, and
the KATP channel inhibitor 5-hydroxydecanoate (5HD) blocked it. Valinomycin, a potassium-selective ionophore, raised FI to 156 % of
control (p <: 0.05). However, 5HD did not affect the valinomycin-induced increase in FI. Inhibition of mitochondrial electron
transport (myxothiazol) or uncoupling of oxidative phosphorylation (dinitrophenol) also blocked either valinomycin- or diazoxide-induced
increase in FI, and free radical scavengers prevented any diazoxide-mediated increase in fluorescence. Finally the diazoxide-induced
increase in fluorescence was not blocked by the PKC inhibitor chelerythrine, but was by HMR 1883, a putative surface KATP channel blocker. Thus opening of KATP channels increases generation of ROS via the mitochondrial electron transport chain in vascular smooth muscle cells. Furthermore,
a potassium-selective ionophore can mimic the effect of putative mitochondrial KATP channel openers. We conclude that potassium
movement through KATP directly leads to ROS production by the mitochondria.
Received: 7 January 2002, Returned for revision: 31 January 2002, Revision received: 21 February 2002, Accepted: 14 March
2002 相似文献
109.
Stigma is a widely used concept in social science research and an extensive literature claims that stigmatisation contributes to numerous negative health outcomes. However, few studies compare groups that vary in the extent to which they are stigmatised and even fewer studies examine stigma's independent and mediating effects. This article addresses these gaps in a comparative study of perceived stigma and drug use among three low‐income feminised service occupations: sex work, food and alcoholic beverage serving, and barbering and hairstyling. An analysis of longitudinal data shows positive associations between sex work, perceived stigma, and socially less acceptable drug use (for example, heroin and cocaine), and that stigma mediates part of the link between sex work and the use of these drugs. Our overall findings suggest that perceived stigma is pronounced among those who work in the sex industry and negatively affects health independently of sex work involvement. 相似文献
110.
Romain Jouffroy Anastasia Saade Alexandre Muret Pascal Philippe Maud Michaloux Pierre Carli Benoit Vivien 《The American journal of emergency medicine》2018,36(10):1754-1758