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Buskermolen AD, Michielsen CMS, de Jong AM, Prins MWJ. Towards continuous monitoring of TNF-α at picomolar concentrations using biosensing by particle motion. Biosens Bioelectron 2024; 249:115934. [PMID: 38215637 DOI: 10.1016/j.bios.2023.115934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 11/30/2023] [Accepted: 12/13/2023] [Indexed: 01/14/2024]
Abstract
The ability to continuously monitor cytokines is desirable for fundamental research studies and healthcare applications. Cytokine release is characterized by picomolar circulating concentrations, short half-lives, and rapid peak times. Here, we describe the characteristics and feasibility of a particle-based biosensing technique for continuous monitoring of TNF-α at picomolar concentrations. The technique is based on the optical tracking of particle motion and uses an antibody sandwich configuration. Experimental results show how the analyte concentration influences the particle diffusivity and characteristic response time of the sensor, and how the sensitivity range depends on the antibody functionalization density. Furthermore, the data clarifies how antibodies supplemented in solution can shorten the characteristic response time. Finally, we demonstrate association rate-based sensing as a first step towards continuous monitoring of picomolar TNF-α concentrations, over a period of 2 h with delay times under 15 min. The insights from this research will enable the development of continuous monitoring sensors using high-affinity binders, providing the sensitivity and speed needed in applications like cytokine monitoring.
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Affiliation(s)
- Alissa D Buskermolen
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands; Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, the Netherlands
| | - Claire M S Michielsen
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands; Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, the Netherlands
| | - Arthur M de Jong
- Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, the Netherlands; Department of Applied Physics, Eindhoven University of Technology, Eindhoven, the Netherlands
| | - Menno W J Prins
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands; Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, the Netherlands; Department of Applied Physics, Eindhoven University of Technology, Eindhoven, the Netherlands; Helia Biomonitoring, Eindhoven, the Netherlands.
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Nguyen M, Gautier T, Masson D, Bouhemad B, Guinot PG. Endotoxemia in Acute Heart Failure and Cardiogenic Shock: Evidence, Mechanisms and Therapeutic Options. J Clin Med 2023; 12:jcm12072579. [PMID: 37048662 PMCID: PMC10094881 DOI: 10.3390/jcm12072579] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2023] [Revised: 03/22/2023] [Accepted: 03/25/2023] [Indexed: 03/31/2023] Open
Abstract
Acute heart failure and cardiogenic shock are frequently occurring and deadly conditions. In patients with those conditions, endotoxemia related to gut injury and gut barrier dysfunction is usually described as a driver of organ dysfunction. Because endotoxemia might reciprocally alter cardiac function, this phenomenon has been suggested as a potent vicious cycle that worsens organ perfusion and leading to adverse outcomes. Yet, evidence beyond this phenomenon might be overlooked, and mechanisms are not fully understood. Subsequently, even though therapeutics available to reduce endotoxin load, there are no indications to treat endotoxemia during acute heart failure and cardiogenic shock. In this review, we first explore the evidence regarding endotoxemia in acute heart failure and cardiogenic shock. Then, we describe the main treatments for endotoxemia in the acute setting, and we present the challenges that remain before personalized treatments against endotoxemia can be used in patients with acute heart failure and cardiogenic shock.
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Courson JA, Langlois KW, Lam FW. Intravital Microscopy to Study Platelet-Leukocyte-Endothelial Interactions in the Mouse Liver. J Vis Exp 2022:10.3791/64239. [PMID: 36282718 PMCID: PMC9915146 DOI: 10.3791/64239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Inflammation and thrombosis are complex processes that occur primarily in the microcirculation. Although standard histology may provide insight into the end pathway for both inflammation and thrombosis, it is not capable of showing the temporal changes that occur throughout the time course of these processes. Intravital microscopy (IVM) is the use of live-animal imaging to gain temporal insight into physiologic processes in vivo. This method is particularly powerful when assessing cellular and protein interactions within the circulation due to the rapid and sequential events that are often necessary for these interactions to occur. While IVM is an extremely powerful imaging methodology capable of viewing complex processes in vivo, there are a number of methodological factors that are important to consider when planning an IVM study. This paper outlines the process of conducting intravital imaging of the liver, identifying important considerations and potential pitfalls that may arise. Thus, this paper describes the use of IVM to study platelet-leukocyte-endothelial interactions in liver sinusoids to study the relative contributions of each in different models of acute liver injury.
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Affiliation(s)
- Justin A Courson
- Center for Translational Research on Inflammatory Diseases, Michael E. DeBakey Veterans Affairs Medical Center; Department of Medicine, Baylor College of Medicine
| | - Kimberly W Langlois
- Center for Translational Research on Inflammatory Diseases, Michael E. DeBakey Veterans Affairs Medical Center; Department of Medicine, Baylor College of Medicine
| | - Fong W Lam
- Center for Translational Research on Inflammatory Diseases, Michael E. DeBakey Veterans Affairs Medical Center; Department of Pediatrics, Baylor College of Medicine;
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Systemic inflammation down-regulates glyoxalase-1 expression: an experimental study in healthy males. Biosci Rep 2021; 41:229081. [PMID: 34156474 PMCID: PMC8411911 DOI: 10.1042/bsr20210954] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 06/11/2021] [Accepted: 06/15/2021] [Indexed: 01/25/2023] Open
Abstract
Background: Hypoxia and inflammation are hallmarks of critical illness, related
to multiple organ failure. A possible mechanism leading to multiple organ
failure is hypoxia- or inflammation-induced down-regulation of the detoxifying
glyoxalase system that clears dicarbonyl stress. The dicarbonyl methylglyoxal
(MGO) is a highly reactive agent produced by metabolic pathways such as
anaerobic glycolysis and gluconeogenesis. MGO leads to protein damage and
ultimately multi-organ failure. Whether detoxification of MGO into D-lactate by
glyoxalase functions appropriately under conditions of hypoxia and inflammation
is largely unknown. We investigated the effect of inflammation and hypoxia on
the MGO pathway in humans in vivo. Methods: After prehydration with glucose 2.5% solution, ten healthy males
were exposed to hypoxia (arterial saturation 80–85%) for 3.5 h
using an air-tight respiratory helmet, ten males to experimental endotoxemia
(LPS 2 ng/kg i.v.), ten males to LPS+hypoxia and ten males to none of these
interventions (control group). Serial blood samples were drawn, and glyoxalase-1
mRNA expression, MGO, methylglyoxal-derived hydroimidazolone-1 (MG-H1),
D-lactate and L-lactate levels, were measured serially. Results: Glyoxalase-1 mRNA expression decreased in the LPS (β
(95%CI); -0.87 (-1.24; -0.50) and the LPS+hypoxia groups; -0.78 (-1.07;
-0.48) (P<0.001). MGO was equal between groups, whereas
MG-H1 increased over time in the control group only
(P=0.003). D-Lactate was increased in all four groups.
L-Lactate was increased in all groups, except in the control group. Conclusion: Systemic inflammation downregulates glyoxalase-1 mRNA expression in
humans. This is a possible mechanism leading to cell damage and multi-organ
failure in critical illness with potential for intervention.
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Albert Vega C, Karakike E, Bartolo F, Mouton W, Cerrato E, Brengel-Pesce K, Giamarellos-Bourboulis EJ, Mallet F, Trouillet-Assant S. Differential response induced by LPS and MPLA in immunocompetent and septic individuals. Clin Immunol 2021; 226:108714. [PMID: 33741504 DOI: 10.1016/j.clim.2021.108714] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 02/23/2021] [Accepted: 03/13/2021] [Indexed: 11/30/2022]
Abstract
Lipopolysaccharide (LPS) and monophosphoryl lipid A (MPLA) induce, overall, similar transcriptional profiles in healthy individuals, although LPS has been shown to more potently induce pro-inflammatory cytokines. We explore herein whether MPLA could be considered as a synthetic replacement of LPS in immune functional assays to study anergy of immune cells in septic patients. Ex vivo whole blood stimulation with MPLA revealed a lower induction of the TNFα secreted protein in 20 septic patients (SP) compared to 10 healthy volunteers (HV), in agreement with monocyte anergy. Principal component analysis of the 93-gene molecular response to MPLA and LPS stimulation found that the main variability was driven by stimulation in HV and by pathophysiology in SP. MPLA was a stronger inducer of the HLA family genes than LPS in both populations, arguing for divergent signalling pathways downstream of TLR-4. In addition, MPLA appeared to present a more informative stratification potential within the septic population.
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Affiliation(s)
- Chloé Albert Vega
- Joint Research Unit Hospices Civils de Lyon-bioMérieux, Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, Pierre-Bénite, 69495 Lyon, France.
| | - Eleni Karakike
- 4th Department of Internal Medicine, National and Kapodistrian University of Athens, Medical School, 124 62 Athens, Greece
| | | | - William Mouton
- Joint Research Unit Hospices Civils de Lyon-bioMérieux, Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, Pierre-Bénite, 69495 Lyon, France; Virpath - Université Lyon, CIRI, INSERM U1111, CNRS 5308, ENS, UCBL, Faculté de Médecine Lyon Est, 69372 Lyon, France
| | - Elisabeth Cerrato
- EA 7426 Pathophysiology of Injury-Induced Immunosuppression, PI3, Claude Bernard Lyon 1 University-bioMérieux-Hospices Civils de Lyon, Hôpital Edouard Herriot, 69437 Lyon, France
| | - Karen Brengel-Pesce
- Joint Research Unit Hospices Civils de Lyon-bioMérieux, Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, Pierre-Bénite, 69495 Lyon, France; EA 7426 Pathophysiology of Injury-Induced Immunosuppression, PI3, Claude Bernard Lyon 1 University-bioMérieux-Hospices Civils de Lyon, Hôpital Edouard Herriot, 69437 Lyon, France
| | | | - François Mallet
- Joint Research Unit Hospices Civils de Lyon-bioMérieux, Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, Pierre-Bénite, 69495 Lyon, France; EA 7426 Pathophysiology of Injury-Induced Immunosuppression, PI3, Claude Bernard Lyon 1 University-bioMérieux-Hospices Civils de Lyon, Hôpital Edouard Herriot, 69437 Lyon, France
| | - Sophie Trouillet-Assant
- Joint Research Unit Hospices Civils de Lyon-bioMérieux, Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, Pierre-Bénite, 69495 Lyon, France; Virpath - Université Lyon, CIRI, INSERM U1111, CNRS 5308, ENS, UCBL, Faculté de Médecine Lyon Est, 69372 Lyon, France.
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Abstract
Sepsis is a major cause of acute kidney injury (AKI) among patients in the intensive care unit. However, the numbers of basic science papers for septic AKI account for only 1% of all publications on AKI. This may be partially attributable to the specific pathophysiology of septic AKI as compared to that of the other types of AKI because it shows only modest histological changes despite functional decline and often requires real-time functional analysis. To increase the scope of research in this field, this article reviews the basic research information that has been reported thus far on the subject of septic AKI, mainly from the viewpoint of functional dysregulation, including some knowledge acquired with multiphoton intravital imaging. Moreover, the efficacy and limitation of the potential novel therapies are discussed. Finally, the author proposes several points that should be considered when designing the study, such as monitoring the long-term effects of the intervention and reflecting the clinical settings for identifying the molecular mechanisms and for challenging the intervention effects.
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Affiliation(s)
- Daisuke Nakano
- Department of Pharmacology, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki, Kita, Kagawa, 761-0793, Japan.
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Human Postprandial Nutrient Metabolism and Low-Grade Inflammation: A Narrative Review. Nutrients 2019; 11:nu11123000. [PMID: 31817857 PMCID: PMC6950246 DOI: 10.3390/nu11123000] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 12/03/2019] [Accepted: 12/04/2019] [Indexed: 12/11/2022] Open
Abstract
The importance of the postprandial state has been acknowledged, since hyperglycemia and hyperlipidemia are linked with several chronic systemic low-grade inflammation conditions. Humans spend more than 16 h per day in the postprandial state and the postprandial state is acknowledged as a complex interplay between nutrients, hormones and diet-derived metabolites. The purpose of this review is to provide insight into the physiology of the postprandial inflammatory response, the role of different nutrients, the pro-inflammatory effects of metabolic endotoxemia and the anti-inflammatory effects of bile acids. Moreover, we discuss nutritional strategies that may be linked to the described pathways to modulate the inflammatory component of the postprandial response.
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Regulation of Gut Microbiota and Metabolic Endotoxemia with Dietary Factors. Nutrients 2019; 11:nu11102277. [PMID: 31547555 PMCID: PMC6835897 DOI: 10.3390/nu11102277] [Citation(s) in RCA: 139] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 09/13/2019] [Accepted: 09/18/2019] [Indexed: 02/08/2023] Open
Abstract
Metabolic endotoxemia is a condition in which blood lipopolysaccharide (LPS) levels are elevated, regardless of the presence of obvious infection. It has been suggested to lead to chronic inflammation-related diseases such as obesity, type 2 diabetes mellitus, non-alcoholic fatty liver disease (NAFLD), pancreatitis, amyotrophic lateral sclerosis, and Alzheimer’s disease. In addition, it has attracted attention as a target for the prevention and treatment of these chronic diseases. As metabolic endotoxemia was first reported in mice that were fed a high-fat diet, research regarding its relationship with diets has been actively conducted in humans and animals. In this review, we summarize the relationship between fat intake and induction of metabolic endotoxemia, focusing on gut dysbiosis and the influx, kinetics, and metabolism of LPS. We also summarize the recent findings about dietary factors that attenuate metabolic endotoxemia, focusing on the regulation of gut microbiota. We hope that in the future, control of metabolic endotoxemia using dietary factors will help maintain human health.
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