1
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Zhao M, Cao Y, Huang IW, Monbouquette HG. Microcontact printing of choline oxidase using a polycation-functionalized zwitterionic polymer as enzyme immobilization matrix. Analyst 2023; 148:5949-5956. [PMID: 37855743 PMCID: PMC10842005 DOI: 10.1039/d3an01263h] [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: 10/20/2023]
Abstract
Highly sensitive and selective choline microbiosensors were constructed by microcontact printing (μCP) of choline oxidase (ChOx) in a crosslinked, polyamine-functionalized zwitterionic polymer matrix on microelectrode arrays (MEAs). μCP has emerged as a potential means to create implantable, multiplexed sensor microprobes, which requires the targeted deposition of different sensor materials to specific microelectrode sites on a MEA. However, the less than sufficient enzyme loading and inadequate spatial resolution achieved with current μCP approaches has limited adoption of the method for electroenzymatic microsensors. A novel polymer, poly(2-methacryloyloxyethyl phosphorylcholine)-g-poly(allylamine hydrochloride) (PMPC-g-PAH), has been developed to address this challenge. PMPC-g-PAH contributes to a higher viscosity "ink" that enables thicker immobilized ChOx deposits of high spatial resolution while also providing a hydrophilic, biocompatible microenvironment for the enzyme. Electroenzymatic choline microbiosensors with sensitivity of 639 ± 96 nA μM-1 cm-2 (pH 7.4; n = 4) were constructed that also are selective against both ascorbic acid and dopamine, which are potential electroactive interfering compounds in the mammalian brain. The high sensitivities achieved can lead to smaller MEA microprobes that minimize tissue damage and make possible the monitoring of multiple neurochemicals simultaneously in vivo with high spatial resolution.
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Affiliation(s)
- Ming Zhao
- Chemical and Biomolecular Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095, USA.
| | - Yan Cao
- Chemical and Biomolecular Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095, USA.
| | - I-Wen Huang
- Chemical and Biomolecular Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095, USA.
| | - Harold G Monbouquette
- Chemical and Biomolecular Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095, USA.
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2
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Murray DS, Stickel L, Boutelle M. Computational Modeling as a Tool to Drive the Development of a Novel, Chemical Device for Monitoring the Injured Brain and Body. ACS Chem Neurosci 2023; 14:3599-3608. [PMID: 37737666 PMCID: PMC10557062 DOI: 10.1021/acschemneuro.3c00063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 09/06/2023] [Indexed: 09/23/2023] Open
Abstract
Real-time measurement of dynamic changes, occurring in the brain and other parts of the body, is useful for the detection and tracked progression of disease and injury. Chemical monitoring of such phenomena exists but is not commonplace, due to the penetrative nature of devices, the lack of continuous measurement, and the inflammatory responses that require pharmacological treatment to alleviate. Soft, flexible devices that more closely match the moduli and shape of monitored tissue and allow for surface microdialysis provide a viable alternative. Here, we show that computational modeling can be used to aid the development of such devices and highlight the considerations when developing a chemical monitoring probe in this way. These models pave the way for the development of a new class of chemical monitoring devices for monitoring neurotrauma, organs, and skin.
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Affiliation(s)
- De-Shaine Murray
- Department
of Bioengineering, Imperial College London SW7 2AZ, London, U.K.
- School
of Engineering and Applied Sciences, Yale
University, 06520, New Haven, Connecticut United States
| | - Laure Stickel
- Department
of Bioengineering, Imperial College London SW7 2AZ, London, U.K.
- Laboratoire
Physico-Chimie Curie, Institut Curie, 26 rue d’Ulm, 75005, Paris, France
| | - Martyn Boutelle
- Department
of Bioengineering, Imperial College London SW7 2AZ, London, U.K.
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3
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Denchev K, Gomez J, Chen P, Rosenblatt K. Traumatic Brain Injury: Intraoperative Management and Intensive Care Unit Multimodality Monitoring. Anesthesiol Clin 2023; 41:39-78. [PMID: 36872007 DOI: 10.1016/j.anclin.2022.11.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
Abstract
Traumatic brain injury is a devastating event associated with substantial morbidity. Pathophysiology involves the initial trauma, subsequent inflammatory response, and secondary insults, which worsen brain injury severity. Management entails cardiopulmonary stabilization and diagnostic imaging with targeted interventions, such as decompressive hemicraniectomy, intracranial monitors or drains, and pharmacological agents to reduce intracranial pressure. Anesthesia and intensive care requires control of multiple physiologic variables and evidence-based practices to reduce secondary brain injury. Advances in biomedical engineering have enhanced assessments of cerebral oxygenation, pressure, metabolism, blood flow, and autoregulation. Many centers employ multimodality neuromonitoring for targeted therapies with the hope to improve recovery.
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Affiliation(s)
- Krassimir Denchev
- Department of Anesthesiology, Wayne State University, 44555 Woodward Avenue, SJMO Medical Office Building, Suite 308, Pontiac, MI 48341, USA
| | - Jonathan Gomez
- Department of Anesthesiology & Critical Care Medicine, Johns Hopkins University School of Medicine, 600 North Wolfe Street, Phipps 455, Baltimore, MD 21287, USA
| | - Pinxia Chen
- Department of Anesthesiology and Critical Care Medicine, St. Luke's University Health Network, 801 Ostrum Street, Bethlehem, PA 18015, USA
| | - Kathryn Rosenblatt
- Department of Anesthesiology & Critical Care Medicine, Johns Hopkins University School of Medicine, 600 North Wolfe Street, Phipps 455, Baltimore, MD 21287, USA; Department of Neurology, Johns Hopkins University School of Medicine, 600 North Wolfe Street, Phipps 455, Baltimore, MD 21287, USA.
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4
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Coles L, Oluwasanya PW, Karam N, Proctor CM. Fluidic enabled bioelectronic implants: opportunities and challenges. J Mater Chem B 2022; 10:7122-7131. [PMID: 35959561 PMCID: PMC9518646 DOI: 10.1039/d2tb00942k] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 07/26/2022] [Indexed: 11/21/2022]
Abstract
Bioelectronic implants are increasingly facilitating novel strategies for clinical diagnosis and treatment. The integration of fluidic technologies into such implants enables new complementary routes for sensing and therapy alongside electrical interaction. Indeed, these two technologies, electrical and fluidic, can work synergistically in a bioelectronics implant towards the fabrication of a complete therapeutic platform. In this perspective article, the leading applications of fluidic enabled bioelectronic implants are highlighted and methods of operation and material choices are discussed. Furthermore, a forward-looking perspective is offered on emerging opportunities as well as critical materials and technological challenges.
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Affiliation(s)
- Lawrence Coles
- Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge, UK.
| | - Pelumi W Oluwasanya
- Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge, UK.
| | - Nuzli Karam
- Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge, UK.
| | - Christopher M Proctor
- Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge, UK.
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5
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Lambers H, Wachsmuth L, Thomas D, Boumezbeur F, Hoesker V, Pradier B, Faber C. Fiber-based lactate recordings with fluorescence resonance energy transfer sensors by applying an magnetic resonance-informed correction of hemodynamic artifacts. NEUROPHOTONICS 2022; 9:032212. [PMID: 35558647 PMCID: PMC9084224 DOI: 10.1117/1.nph.9.3.032212] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 04/06/2022] [Indexed: 06/15/2023]
Abstract
Significance: Fluorescence resonance energy transfer (FRET) sensors offer enormous benefits when studying neurophysiology through confocal microscopy. Yet, their use for fiber-based in vivo recordings is hampered by massive confounding effects and has therefore been scarcely reported. Aim: We aim to investigate whether in vivo fiber-based lactate recordings in the rodent brain are feasible with FRET sensors and implement a correction algorithm for the predominant hemodynamic artifact. Approach: We performed fiber-based FRET recordings of lactate (Laconic) and calcium (Twitch-2B) simultaneously with functional MRI and pharmacological MRI. MR-derived parameters were applied to correct hemodynamic artifacts. Results of FRET measurements were validated by local field potential, magnetic resonance spectroscopy, and blood analysis. Results: Hemodynamic artifacts dominated fiber-based in vivo FRET measurements with both Laconic and Twitch-2B. Our MR-based correction algorithm enabled to remove the artifacts and detect lactate and calcium changes during sensory stimulation or intravenous lactate injections. Conclusions: In vivo fiber-based lactate recordings are feasible using FRET-based sensors. However, signal corrections are required. MR-derived hemodynamic parameters can successfully be applied for artifact correction.
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Affiliation(s)
- Henriette Lambers
- University Hospital Münster, Translational Research Imaging Center (TRIC), Clinic for Radiology, Münster, Germany
| | - Lydia Wachsmuth
- University Hospital Münster, Translational Research Imaging Center (TRIC), Clinic for Radiology, Münster, Germany
| | - Dominik Thomas
- University Hospital Münster, Translational Research Imaging Center (TRIC), Clinic for Radiology, Münster, Germany
| | - Fawzi Boumezbeur
- NeuroSpin, CEA, CNRS, Paris-Saclay University, Gif-Sur-Yvette, France
| | - Vanessa Hoesker
- University Hospital Münster, Translational Research Imaging Center (TRIC), Clinic for Radiology, Münster, Germany
| | - Bruno Pradier
- University Hospital Münster, Translational Research Imaging Center (TRIC), Clinic for Radiology, Münster, Germany
| | - Cornelius Faber
- University Hospital Münster, Translational Research Imaging Center (TRIC), Clinic for Radiology, Münster, Germany
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6
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Zimphango C, Alimagham FC, Carpenter KLH, Hutchinson PJ, Hutter T. Monitoring Neurochemistry in Traumatic Brain Injury Patients Using Microdialysis Integrated with Biosensors: A Review. Metabolites 2022; 12:metabo12050393. [PMID: 35629896 PMCID: PMC9146878 DOI: 10.3390/metabo12050393] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Revised: 04/14/2022] [Accepted: 04/20/2022] [Indexed: 02/04/2023] Open
Abstract
In a traumatically injured brain, the cerebral microdialysis technique allows continuous sampling of fluid from the brain’s extracellular space. The retrieved brain fluid contains useful metabolites that indicate the brain’s energy state. Assessment of these metabolites along with other parameters, such as intracranial pressure, brain tissue oxygenation, and cerebral perfusion pressure, may help inform clinical decision making, guide medical treatments, and aid in the prognostication of patient outcomes. Currently, brain metabolites are assayed on bedside analysers and results can only be achieved hourly. This is a major drawback because critical information within each hour is lost. To address this, recent advances have focussed on developing biosensing techniques for integration with microdialysis to achieve continuous online monitoring. In this review, we discuss progress in this field, focusing on various types of sensing devices and their ability to quantify specific cerebral metabolites at clinically relevant concentrations. Important points that require further investigation are highlighted, and comments on future perspectives are provided.
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Affiliation(s)
- Chisomo Zimphango
- Division of Neurosurgery, Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0QQ, UK; (F.C.A.); (K.L.H.C.); (P.J.H.); (T.H.)
- Correspondence:
| | - Farah C. Alimagham
- Division of Neurosurgery, Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0QQ, UK; (F.C.A.); (K.L.H.C.); (P.J.H.); (T.H.)
| | - Keri L. H. Carpenter
- Division of Neurosurgery, Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0QQ, UK; (F.C.A.); (K.L.H.C.); (P.J.H.); (T.H.)
| | - Peter J. Hutchinson
- Division of Neurosurgery, Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0QQ, UK; (F.C.A.); (K.L.H.C.); (P.J.H.); (T.H.)
| | - Tanya Hutter
- Division of Neurosurgery, Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0QQ, UK; (F.C.A.); (K.L.H.C.); (P.J.H.); (T.H.)
- Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
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7
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Berhouma M, Eker OF, Dailler F, Rheims S, Balanca B. Cortical Spreading Depolarizations in Aneurysmal Subarachnoid Hemorrhage: An Overview of Current Knowledge and Future Perspectives. Adv Tech Stand Neurosurg 2022; 45:229-244. [PMID: 35976452 DOI: 10.1007/978-3-030-99166-1_7] [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] [Indexed: 06/15/2023]
Abstract
Despite significant advances in the management of aneurysmal subarachnoid hemorrhage (SAH), morbidity and mortality remain devastating particularly for high-grade SAH. Poor functional outcome usually results from delayed cerebral ischemia (DCI). The pathogenesis of DCI during aneurysmal SAH has historically been attributed to cerebral vasospasm, but spreading depolarizations (SDs) are now considered to play a central role in DCI. During SAH, SDs may produce an inverse hemodynamic response leading to spreading ischemia. Several animal models have contributed to a better understanding of the pathogenesis of SDs during aneurysmal SAH and provided new therapeutic approaches including N-methyl-D-aspartate receptor antagonists and phosphodiesterase inhibitors. Herein we review the current knowledge in the field of SDs' pathogenesis and we detail the key experimental and clinical studies that have opened interesting new therapeutic approaches to prevent DCI in aneurysmal SAH.
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Affiliation(s)
- Moncef Berhouma
- Department of Neurosurgical Oncology and Vascular Neurosurgery, Pierre Wertheimer Neurological and Neurosurgical Hospital, Hospices Civils de Lyon (Lyon University Hospital), Lyon, France.
- Creatis Lab, CNRS UMR 5220, INSERM U1206, Lyon 1 University, INSA Lyon, Lyon, France.
| | - Omer Faruk Eker
- Creatis Lab, CNRS UMR 5220, INSERM U1206, Lyon 1 University, INSA Lyon, Lyon, France
- Department of Interventional Neuroradiology, Pierre Wertheimer Neurological and Neurosurgical Hospital, Hospices Civils de Lyon (Lyon University Hospital), Lyon, France
| | - Frederic Dailler
- Department of Neuro-Anesthesia and Neuro-Critical Care, Pierre Wertheimer Neurological and Neurosurgical Hospital, Hospices Civils de Lyon (Lyon University Hospital), Lyon, France
| | - Sylvain Rheims
- Department of Functional Neurology and Epileptology, Pierre Wertheimer Neurological and Neurosurgical Hospital, Hospices Civils de Lyon (Lyon University Hospital), Lyon, France
- Lyon's Neurosciences Research Center, INSERM U1028/CNRS, UMR 5292, University of Lyon, Lyon, France
| | - Baptiste Balanca
- Department of Neuro-Anesthesia and Neuro-Critical Care, Pierre Wertheimer Neurological and Neurosurgical Hospital, Hospices Civils de Lyon (Lyon University Hospital), Lyon, France
- Lyon's Neurosciences Research Center, INSERM U1028/CNRS, UMR 5292, University of Lyon, Lyon, France
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8
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Booth MA, Gowers SAN, Hersey M, Samper IC, Park S, Anikeeva P, Hashemi P, Stevens MM, Boutelle MG. Fiber-Based Electrochemical Biosensors for Monitoring pH and Transient Neurometabolic Lactate. Anal Chem 2021; 93:6646-6655. [PMID: 33797893 PMCID: PMC8153388 DOI: 10.1021/acs.analchem.0c05108] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
![]()
Developing tools
that are able to monitor transient neurochemical
dynamics is important to decipher brain chemistry and function. Multifunctional
polymer-based fibers have been recently applied to monitor and modulate
neural activity. Here, we explore the potential of polymer fibers
comprising six graphite-doped electrodes and two microfluidic channels
within a flexible polycarbonate body as a platform for sensing pH
and neurometabolic lactate. Electrodes were made into potentiometric
sensors (responsive to pH) or amperometric sensors (lactate biosensors).
The growth of an iridium oxide layer made the fiber electrodes responsive
to pH in a physiologically relevant range. Lactate biosensors were
fabricated via platinum black growth on the fiber electrode, followed
by an enzyme layer, making them responsive to lactate concentration.
Lactate fiber biosensors detected transient neurometabolic lactate
changes in an in vivo mouse model. Lactate concentration changes were
associated with spreading depolarizations, known to be detrimental
to the injured brain. Induced waves were identified by a signature
lactate concentration change profile and measured as having a speed
of ∼2.7 mm/min (n = 4 waves). Our work highlights
the potential applications of fiber-based biosensors for direct monitoring
of brain metabolites in the context of injury.
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Affiliation(s)
- Marsilea A Booth
- Department of Bioengineering, Imperial College London, London SW7 2AZ, U.K.,Department of Materials, Imperial College London, London SW7 2AZ, U.K.,Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, U.K
| | - Sally A N Gowers
- Department of Bioengineering, Imperial College London, London SW7 2AZ, U.K
| | - Melinda Hersey
- Department of Chemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Isabelle C Samper
- Department of Bioengineering, Imperial College London, London SW7 2AZ, U.K
| | - Seongjun Park
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.,Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.,KAIST Institute for Health Science and Technology, Daejeon 34141, Republic of Korea
| | - Polina Anikeeva
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Parastoo Hashemi
- Department of Materials, Imperial College London, London SW7 2AZ, U.K.,Department of Chemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Molly M Stevens
- Department of Bioengineering, Imperial College London, London SW7 2AZ, U.K.,Department of Materials, Imperial College London, London SW7 2AZ, U.K.,Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, U.K
| | - Martyn G Boutelle
- Department of Bioengineering, Imperial College London, London SW7 2AZ, U.K
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9
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Huang IW, Clay M, Cao Y, Nie J, Guo Y, Monbouquette HG. Electroenzymatic choline sensing at near the theoretical performance limit. Analyst 2021; 146:1040-1047. [PMID: 33325460 DOI: 10.1039/d0an01939a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A high performance, electroenzymatic microsensor for choline based on choline oxidase (ChOx) immobilized on Pt coated with permselective polymer layers has been created that exhibits sensitivity approaching the theoretical performance limit. Sensor construction was guided by simulations performed with a detailed mathematical model. Implantable microsensors with an array of electroenzymatic sensing sites provide a means to record concentration changes of choline, an effective surrogate for acetylcholine due to its very rapid turnover in the brain, and other neurochemicals in vivo. However, electroenzymatic sensors generally have insufficient sensitivity and response time to monitor neurotransmitter signaling on the millisecond timescale with cellular-level spatial resolution. Model simulations suggested that choline sensor performance can be improved significantly by optimizing immobilized ChOx layer thickness and minimizing the thicknesses of permselective polymer coatings as well. Electroenzymatic choline sensors constructed with a ∼5 μm-thick crosslinked ChOx layer atop 200 nm-thick permselective films (poly(m-phenylenediamine) and Nafion) exhibited unprecedented sensitivity and response time of 660 ± 40 nA μM-1 cm-2 at 37 °C and 0.36 ± 0.05 s, respectively, while maintaining excellent selectivity. Such performance characteristics provide greater flexibility in the design of microelectrode array (MEA) probes with near cellular-scale sensing sites arranged in more dense arrays. Also, faster response times enable better resolution of transient acetylcholine signals and better correlation of these events with electrophysiological recordings so as to advance study of brain function.
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Affiliation(s)
- I-Wen Huang
- Chemical and Biomolecular Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095, USA.
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10
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Jaquins-Gerstl A, Michael AC. Dexamethasone-Enhanced Microdialysis and Penetration Injury. Front Bioeng Biotechnol 2020; 8:602266. [PMID: 33364231 PMCID: PMC7752925 DOI: 10.3389/fbioe.2020.602266] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 11/11/2020] [Indexed: 01/25/2023] Open
Abstract
Microdialysis probes, electrochemical microsensors, and neural prosthetics are often used for in vivo monitoring, but these are invasive devices that are implanted directly into brain tissue. Although the selectivity, sensitivity, and temporal resolution of these devices have been characterized in detail, less attention has been paid to the impact of the trauma they inflict on the tissue or the effect of any such trauma on the outcome of the measurements they are used to perform. Factors affecting brain tissue reaction to the implanted devices include: the mechanical trauma during insertion, the foreign body response, implantation method, and physical properties of the device (size, shape, and surface characteristics. Modulation of the immune response is an important step toward making these devices with reliable long-term performance. Local release of anti-inflammatory agents such as dexamethasone (DEX) are often used to mitigate the foreign body response. In this article microdialysis is used to locally deliver DEX to the surrounding brain tissue. This work discusses the immune response resulting from microdialysis probe implantation. We briefly review the principles of microdialysis and the applications of DEX with microdialysis in (i) neuronal devices, (ii) dopamine and fast scan cyclic voltammetry, (iii) the attenuation of microglial cells, (iv) macrophage polarization states, and (v) spreading depolarizations. The difficulties and complexities in these applications are herein discussed.
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11
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Flavin Adenine Dinucleotide Fluorescence as an Early Marker of Mitochondrial Impairment During Brain Hypoxia. Int J Mol Sci 2020; 21:ijms21113977. [PMID: 32492921 PMCID: PMC7312830 DOI: 10.3390/ijms21113977] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 05/28/2020] [Accepted: 05/30/2020] [Indexed: 12/31/2022] Open
Abstract
Multimodal continuous bedside monitoring is increasingly recognized as a promising option for early treatment stratification in patients at risk for ischemia during neurocritical care. Modalities used at present are, for example, oxygen availability and subdural electrocorticography. The assessment of mitochondrial function could be an interesting complement to these modalities. For instance, flavin adenine dinucleotide (FAD) fluorescence permits direct insight into the mitochondrial redox state. Therefore, we explored the possibility of using FAD fluorometry to monitor consequences of hypoxia in brain tissue in vitro and in vivo. By combining experimental results with computational modeling, we identified the potential source responsible for the fluorescence signal and gained insight into the hypoxia-associated metabolic changes in neuronal energy metabolism. In vitro, hypoxia was characterized by a reductive shift of FAD, impairment of synaptic transmission and increasing interstitial potassium [K+]o. Computer simulations predicted FAD changes to originate from the citric acid cycle enzyme α-ketoglutarate dehydrogenase and pyruvate dehydrogenase. In vivo, the FAD signal during early hypoxia displayed a reductive shift followed by a short oxidation associated with terminal spreading depolarization. In silico, initial tissue hypoxia followed by a transient re-oxygenation phase due to glucose depletion might explain FAD dynamics in vivo. Our work suggests that FAD fluorescence could be readily used to monitor mitochondrial function during hypoxia and represents a potential diagnostic tool to differentiate underlying metabolic processes for complementation of multimodal brain monitoring.
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12
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Huang IW, Clay M, Wang S, Guo Y, Nie J, Monbouquette HG. Electroenzymatic glutamate sensing at near the theoretical performance limit. Analyst 2020; 145:2602-2611. [PMID: 31998887 PMCID: PMC7117983 DOI: 10.1039/c9an01969c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The sensitivity and response time of glutamate sensors based on glutamate oxidase immobilized on planar platinum microelectrodes have been improved to near the theoretical performance limits predicted by a detailed mathematical model. Microprobes with an array of electroenzymatic sensing sites have emerged as useful tools for the monitoring of glutamate and other neurotransmitters in vivo; and implemented as such, they can be used to study many complex neurological diseases and disorders including Parkinson's disease and drug addiction. However, less than optimal sensitivity and response time has limited the spatiotemporal resolution of these promising research tools. A mathematical model has guided systematic improvement of an electroenzymatic glutamate microsensor constructed with a 1-2 μm-thick crosslinked glutamate oxidase layer and underlying permselective coating of polyphenylenediamine and Nafion reduced to less than 200 nm thick. These design modifications led to a nearly 6-fold improvement in sensitivity to 320 ± 20 nA μM-1 cm-2 at 37 °C and a ∼10-fold reduction in response time to 80 ± 10 ms. Importantly, the sensitivity and response times were attained while maintaining a low detection limit and excellent selectivity. Direct measurement of the transport properties of the enzyme and polymer layers used to create the biosensors enabled improvement of the mathematical model as well. Subsequent model simulations indicated that the performance characteristics achieved with the optimized biosensors approach the theoretical limits predicted for devices of this construction. Such high-performance glutamate biosensors will be more effective in vivo at a size closer to cellular dimension and will enable better correlation of glutamate signaling events with electrical recordings.
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Affiliation(s)
- I-Wen Huang
- Chemical and Biomolecular Engineering Department University of California, Los Angeles, Los Angeles, CA 90095, USA.
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13
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Capo-Rangel G, Gerardo-Giorda L, Somersalo E, Calvetti D. Metabolism plays a central role in the cortical spreading depression: Evidence from a mathematical model. J Theor Biol 2020; 486:110093. [PMID: 31778711 DOI: 10.1016/j.jtbi.2019.110093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 10/28/2019] [Accepted: 11/23/2019] [Indexed: 11/24/2022]
Abstract
The slow propagating waves of strong depolarization of neural cells characterizing cortical spreading depression, or depolarization, (SD) are known to break cerebral homeostasis and induce significant hemodynamic and electro-metabolic alterations. Mathematical models of cortical spreading depression found in the literature tend to focus on the changes occurring at the electrophysiological level rather than on the ensuing metabolic changes. In this paper, we propose a novel mathematical model which is able to simulate the coupled electrophysiology and metabolism dynamics of SD events, including the swelling of neurons and astrocytes and the concomitant shrinkage of extracellular space. The simulations show that the metabolic coupling leads to spontaneous repetitions of the SD events, which the electrophysiological model alone is not capable to produce. The model predictions, which corroborate experimental findings from the literature, show a strong disruption in metabolism accompanying each wave of spreading depression in the form of a sharp decrease of glucose and oxygen concentrations, with a simultaneous increase in lactate concentration which, in turn, delays the clearing of excess potassium in extracellular space. Our model suggests that the depletion of glucose and oxygen concentration is more pronounced in astrocyte than neuron, in line with the partitioning of the energetic cost of potassium clearing. The model suggests that the repeated SD events are electro-metabolic oscillations that cannot be explained by the electrophysiology alone. The model highlights the crucial role of astrocytes in cleaning the excess potassium flooding extracellular space during a spreading depression event: further, if the ratio of glial/neuron density increases, the frequency of cortical SD events decreases, and the peak potassium concentration in extracellular space is lower than with equal volume fractions.
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Affiliation(s)
| | | | - E Somersalo
- Basque Center for Applied Mathematics, Spain
| | - D Calvetti
- Department of Mathematics, Applied Mathematics and Statistics, Case Western Reserve University, Ohio.
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14
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Gowers SAN, Samper IC, Murray DSRK, Smith GK, Jeyaprakash S, Rogers ML, Karlsson M, Olsen MH, Møller K, Boutelle MG. Real-time neurochemical measurement of dynamic metabolic events during cardiac arrest and resuscitation in a porcine model. Analyst 2020; 145:1894-1902. [DOI: 10.1039/c9an01950b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
This work describes a fully-integrated portable microfluidic analysis system for real-time monitoring of dynamic changes in glucose and lactate occurring in the brain as a result of cardiac arrest and resuscitation.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Kirsten Møller
- Department of Neuroanaesthesiology
- Rigshospitalet
- Copenhagen
- Denmark
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15
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Samper IC, Gowers SAN, Booth MA, Wang C, Watts T, Phairatana T, Vallant N, Sandhu B, Papalois V, Boutelle MG. Portable Microfluidic Biosensing System for Real-Time Analysis of Microdialysate in Transplant Kidneys. Anal Chem 2019; 91:14631-14638. [PMID: 31647870 PMCID: PMC7110273 DOI: 10.1021/acs.analchem.9b03774] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Currently, there is a severe shortage of donor kidneys that are fit for transplantation, due in part to a lack of adequate viability assessment tools for transplant organs. This work presents the integration of a novel wireless two-channel amperometric potentiostat with microneedle-based glucose and lactate biosensors housed in a 3D printed chip to create a microfluidic biosensing system that is genuinely portable. The wireless potentiostat transmits data via Bluetooth to an Android app running on a tablet. The whole miniaturized system is fully enclosed and can be integrated with microdialysis to allow continuous monitoring of tissue metabolite levels in real time. We have also developed a wireless portable automated calibration platform so that biosensors can be calibrated away from the laboratory and in transit. As a proof of concept, we have demonstrated the use of this portable analysis system to monitor porcine kidneys for the first time from organ retrieval, through warm ischemia, transportation on ice, right through to cold preservation and reperfusion. The portable system is robust and reliable in the challenging conditions of the abattoir and during kidney transportation and can detect clear physiological changes in the organ associated with clinical interventions.
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Affiliation(s)
- Isabelle C Samper
- Department of Bioengineering , Imperial College London , London SW7 2AZ , U.K
| | - Sally A N Gowers
- Department of Bioengineering , Imperial College London , London SW7 2AZ , U.K
| | - Marsilea A Booth
- Department of Bioengineering , Imperial College London , London SW7 2AZ , U.K
| | - Chu Wang
- Department of Bioengineering , Imperial College London , London SW7 2AZ , U.K
| | - Thomas Watts
- Department of Bioengineering , Imperial College London , London SW7 2AZ , U.K
| | - Tonghathai Phairatana
- Department of Bioengineering , Imperial College London , London SW7 2AZ , U.K.,Institute of Biomedical Engineering, Faculty of Medicine , Prince of Songkla University , Hat Yai 90110 , Thailand
| | - Natalie Vallant
- Department of Surgery and Cancer , Imperial College London , London SW7 2AZ , U.K
| | - Bynvant Sandhu
- Department of Surgery and Cancer , Imperial College London , London SW7 2AZ , U.K
| | - Vassilios Papalois
- Department of Surgery and Cancer , Imperial College London , London SW7 2AZ , U.K
| | - Martyn G Boutelle
- Department of Bioengineering , Imperial College London , London SW7 2AZ , U.K
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16
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Huang L, Yu W, Guo X, Huang Y, Zhou Q, Zhai H. Chip-based multi-molecularly imprinted monolithic capillary array columns coated Fe3O4/GO for selective extraction and simultaneous determination of tetracycline, chlortetracycline and deoxytetracycline in eggs. Microchem J 2019. [DOI: 10.1016/j.microc.2019.104097] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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17
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Robbins EM, Jaquins-Gerstl A, Fine DF, Leong CL, Dixon CE, Wagner AK, Boutelle MG, Michael AC. Extended (10-Day) Real-Time Monitoring by Dexamethasone-Enhanced Microdialysis in the Injured Rat Cortex. ACS Chem Neurosci 2019; 10:3521-3531. [PMID: 31246409 DOI: 10.1021/acschemneuro.9b00145] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Intracerebral microdialysis has proven useful for chemical monitoring in patients following traumatic brain injury. Recent studies in animals, however, have documented that insertion of microdialysis probes into brain tissues initiates a foreign-body response. Within a few days after probe insertion, the foreign body response impedes the use of microdialysis to monitor the K+ and glucose transients associated with spreading depolarization, a potential mechanism for secondary brain injury. Herein, we show that perfusing microdialysis probes with dexamethasone, a potent anti-inflammatory glucocorticoid, suppresses the foreign body response and facilitates the monitoring of spontaneous spreading depolarizations for at least 10 days following controlled cortical injury in the rat. In addition to spreading depolarizations, results of this study suggest that a progressive, apparently permanent, decline in pericontusional interstitial glucose may be an additional sequela of brain injury. This study establishes extended dexamethasone-enhanced microdialysis in the injured rodent cortex as a new paradigm for investigating trauma-induced metabolic crisis.
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Affiliation(s)
- Elaine M. Robbins
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Andrea Jaquins-Gerstl
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - David F. Fine
- Department of Physical Medicine and Rehabilitation, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213, United States
| | - Chi Leng Leong
- Department of Bioengineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - C. Edward Dixon
- Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213, United States
| | - Amy K. Wagner
- Department of Physical Medicine and Rehabilitation, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213, United States
| | - Martyn G. Boutelle
- Department of Bioengineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - Adrian C. Michael
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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18
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Gowers SAN, Rogers ML, Booth MA, Leong CL, Samper IC, Phairatana T, Jewell SL, Pahl C, Strong AJ, Boutelle MG. Clinical translation of microfluidic sensor devices: focus on calibration and analytical robustness. LAB ON A CHIP 2019; 19:2537-2548. [PMID: 31290529 PMCID: PMC7321805 DOI: 10.1039/c9lc00400a] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
We present approaches to facilitate the use of microfluidics outside of the laboratory, in our case within a clinical setting and monitoring from human subjects, where the complexity of microfluidic devices requires high skill and expertise and would otherwise limit translation. Microfluidic devices show great potential for converting complex laboratory protocols into on-chip processes. We demonstrate a flexible microfluidic platform can be coupled to microfluidic biosensors and used in conjunction with clinical microdialysis. The versatility is demonstrated through a series of examples of increasing complexity including analytical processes relevant to a clinical environment such as automatic calibration, standard addition, and more general processes including system optimisation, reagent addition and homogenous enzyme reactions. The precision and control offered by this set-up enables the use of microfluidics by non-experts in clinical settings, increasing uptake and usage in real-world scenarios. We demonstrate how this type of system is helpful in guiding physicians in real-time clinical decision-making.
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Affiliation(s)
| | | | | | - Chi L Leong
- Department of Bioengineering, Imperial College London, UK.
| | | | - Tonghathai Phairatana
- Department of Bioengineering, Imperial College London, UK. and Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Hat Yai, Thailand
| | | | - Clemens Pahl
- Department of Basic and Clinical Neuroscience, Kings College London, UK
| | - Anthony J Strong
- Department of Basic and Clinical Neuroscience, Kings College London, UK
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19
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Nightingale AM, Leong CL, Burnish RA, Hassan SU, Zhang Y, Clough GF, Boutelle MG, Voegeli D, Niu X. Monitoring biomolecule concentrations in tissue using a wearable droplet microfluidic-based sensor. Nat Commun 2019; 10:2741. [PMID: 31227695 PMCID: PMC6588579 DOI: 10.1038/s41467-019-10401-y] [Citation(s) in RCA: 70] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2018] [Accepted: 05/07/2019] [Indexed: 01/02/2023] Open
Abstract
Knowing how biomarker levels vary within biological fluids over time can produce valuable insight into tissue physiology and pathology, and could inform personalised clinical treatment. We describe here a wearable sensor for monitoring biomolecule levels that combines continuous fluid sampling with in situ analysis using wet-chemical assays (with the specific assay interchangeable depending on the target biomolecule). The microfluidic device employs a droplet flow regime to maximise the temporal response of the device, using a screw-driven push-pull peristaltic micropump to robustly produce nanolitre-sized droplets. The fully integrated sensor is contained within a small (palm-sized) footprint, is fully autonomous, and features high measurement frequency (a measurement every few seconds) meaning deviations from steady-state levels are quickly detected. We demonstrate how the sensor can track perturbed glucose and lactate levels in dermal tissue with results in close agreement with standard off-line analysis and consistent with changes in peripheral blood levels.
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Affiliation(s)
- Adrian M Nightingale
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, SO17 1BJ, UK
| | - Chi Leng Leong
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, SO17 1BJ, UK
- Department of Bioengineering, Imperial College London, South Kensington, London, SW7 2AZ, UK
| | - Rachel A Burnish
- Critical Care/ Anaesthesia and Perioperative Medicine Research Unit, University Hospital Southampton NHS Foundation Trust, Tremona Road, Southampton, SO16 6YD, UK
| | - Sammer-Ul Hassan
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, SO17 1BJ, UK
| | - Yu Zhang
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, SO17 1BJ, UK
| | - Geraldine F Clough
- Faculty of Medicine, University of Southampton, Southampton, SO17 1BJ, UK
| | - Martyn G Boutelle
- Department of Bioengineering, Imperial College London, South Kensington, London, SW7 2AZ, UK
| | - David Voegeli
- Faculty of Environmental and Life Sciences, University of Southampton, Southampton, SO17 1BJ, UK
- Now at Department of Sport, Exercise & Health, University of Winchester, Winchester, SO22 4NR, UK
| | - Xize Niu
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, SO17 1BJ, UK.
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20
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Samper IC, Gowers SAN, Rogers ML, Murray DSRK, Jewell SL, Pahl C, Strong AJ, Boutelle MG. 3D printed microfluidic device for online detection of neurochemical changes with high temporal resolution in human brain microdialysate. LAB ON A CHIP 2019; 19:2038-2048. [PMID: 31094398 PMCID: PMC9209945 DOI: 10.1039/c9lc00044e] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
This paper presents the design, optimisation and fabrication of a mechanically robust 3D printed microfluidic device for the high time resolution online analysis of biomarkers in a microdialysate stream at microlitre per minute flow rates. The device consists of a microfluidic channel with secure low volume connections that easily integrates electrochemical biosensors for biomarkers such as glutamate, glucose and lactate. The optimisation process of the microfluidic channel fabrication, including for different types of 3D printer, is explained and the resulting improvement in sensor response time is quantified. The time resolution of the device is characterised by recording short lactate concentration pulses. The device is employed to record simultaneous glutamate, glucose and lactate concentration changes simulating the physiological response to spreading depolarisation events in cerebrospinal fluid dialysate. As a proof-of-concept study, the device is then used in the intensive care unit for online monitoring of a brain injury patient, demonstrating its capabilities for clinical monitoring.
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Affiliation(s)
| | | | | | | | - Sharon L Jewell
- Department of Basic and Clinical Neuroscience, King's College, London, UK
| | - Clemens Pahl
- Department of Basic and Clinical Neuroscience, King's College, London, UK
| | - Anthony J Strong
- Department of Basic and Clinical Neuroscience, King's College, London, UK
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21
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Meunier CJ, McCarty GS, Sombers LA. Drift Subtraction for Fast-Scan Cyclic Voltammetry Using Double-Waveform Partial-Least-Squares Regression. Anal Chem 2019; 91:7319-7327. [PMID: 31081629 DOI: 10.1021/acs.analchem.9b01083] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Background-subtracted fast-scan cyclic voltammetry (FSCV) provides a method for detecting molecular fluctuations with high spatiotemporal resolution in the brain of awake and behaving animals. The rapid scan rates generate large background currents that are subtracted to reveal changes in analyte concentration. Although these background currents are relatively stable, small changes do occur over time. These changes, referred to as electrochemical drift, result in background-subtraction artifacts that constrain the utility of FSCV, particularly when quantifying chemical changes that gradually occur over long measurement times (minutes). The voltammetric features of electrochemical drift are varied and can span the entire potential window, potentially obscuring the signal from any targeted analyte. We present a straightforward method for extending the duration of a single FSCV recording window. First, we have implemented voltammetric waveforms in pairs that consist of a smaller triangular sweep followed by a conventional voltammetric scan. The initial, abbreviated waveform is used to capture drift information that can serve as a predictor for the contribution of electrochemical drift to the subsequent full voltammetric scan using partial-least-squares regression (PLSR). This double-waveform partial-least-squares regression (DW-PLSR) paradigm permits reliable subtraction of the drift component to the voltammetric data. Here, DW-PLSR is used to improve quantification of adenosine, dopamine, and hydrogen peroxide fluctuations occurring >10 min from the initial background position, both in vitro and in vivo. The results demonstrate that DW-PLSR is a powerful tool for evaluating and interpreting both rapid (seconds) and gradual (minutes) chemical changes captured in FSCV recordings over extended durations.
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Affiliation(s)
- Carl J Meunier
- Department of Chemistry , North Carolina State University , Raleigh , North Carolina 27695-8204 , United States
| | - Gregory S McCarty
- Department of Chemistry , North Carolina State University , Raleigh , North Carolina 27695-8204 , United States
| | - Leslie A Sombers
- Department of Chemistry , North Carolina State University , Raleigh , North Carolina 27695-8204 , United States
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22
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Xiao T, Wang Y, Wei H, Yu P, Jiang Y, Mao L. Electrochemical Monitoring of Propagative Fluctuation of Ascorbate in the Live Rat Brain during Spreading Depolarization. Angew Chem Int Ed Engl 2019; 58:6616-6619. [DOI: 10.1002/anie.201901035] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 02/20/2019] [Indexed: 12/19/2022]
Affiliation(s)
- Tongfang Xiao
- Beijing National Laboratory for Molecular SciencesKey Laboratory of Analytical Chemistry for Living BiosystemsInstitute of Chemistry, theChinese Academy of Sciences (CAS)CAS Research/Education Center for Excellence in Molecular Science Beijing 100190 China
| | - Yuexiang Wang
- Beijing National Laboratory for Molecular SciencesKey Laboratory of Analytical Chemistry for Living BiosystemsInstitute of Chemistry, theChinese Academy of Sciences (CAS)CAS Research/Education Center for Excellence in Molecular Science Beijing 100190 China
| | - Huan Wei
- Beijing National Laboratory for Molecular SciencesKey Laboratory of Analytical Chemistry for Living BiosystemsInstitute of Chemistry, theChinese Academy of Sciences (CAS)CAS Research/Education Center for Excellence in Molecular Science Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Ping Yu
- Beijing National Laboratory for Molecular SciencesKey Laboratory of Analytical Chemistry for Living BiosystemsInstitute of Chemistry, theChinese Academy of Sciences (CAS)CAS Research/Education Center for Excellence in Molecular Science Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Ying Jiang
- Beijing National Laboratory for Molecular SciencesKey Laboratory of Analytical Chemistry for Living BiosystemsInstitute of Chemistry, theChinese Academy of Sciences (CAS)CAS Research/Education Center for Excellence in Molecular Science Beijing 100190 China
| | - Lanqun Mao
- Beijing National Laboratory for Molecular SciencesKey Laboratory of Analytical Chemistry for Living BiosystemsInstitute of Chemistry, theChinese Academy of Sciences (CAS)CAS Research/Education Center for Excellence in Molecular Science Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
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23
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Baumann KY, Church MK, Clough GF, Quist SR, Schmelz M, Skov PS, Anderson CD, Tannert LK, Giménez-Arnau AM, Frischbutter S, Scheffel J, Maurer M. Skin microdialysis: methods, applications and future opportunities-an EAACI position paper. Clin Transl Allergy 2019; 9:24. [PMID: 31007896 PMCID: PMC6456961 DOI: 10.1186/s13601-019-0262-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2019] [Accepted: 03/25/2019] [Indexed: 12/20/2022] Open
Abstract
Skin microdialysis (SMD) is a versatile sampling technique that can be used to recover soluble endogenous and exogenous molecules from the extracellular compartment of human skin. Due to its minimally invasive character, SMD can be applied in both clinical and preclinical settings. Despite being available since the 1990s, the technique has still not reached its full potential use as a tool to explore pathophysiological mechanisms of allergic and inflammatory reactions in the skin. Therefore, an EAACI Task Force on SMD was formed to disseminate knowledge about the technique and its many applications. This position paper from the task force provides an overview of the current use of SMD in the investigation of the pathogenesis of chronic inflammatory skin diseases, such as atopic dermatitis, chronic urticaria, psoriasis, and in studies of cutaneous events during type 1 hypersensitivity reactions. Furthermore, this paper covers drug hypersensitivity, UVB-induced- and neurogenic inflammation, and drug penetration investigated by SMD. The aim of this paper is to encourage the use of SMD and to make the technique easily accessible by providing an overview of methodology and applications, supported by standardized operating procedures for SMD in vivo and ex vivo.
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Affiliation(s)
- Katrine Y Baumann
- RefLab ApS, Copenhagen, Denmark.,2Department of Immunology and Microbiology, University of Copenhagen, Copenhagen, Denmark
| | - Martin K Church
- 3Department of Dermatology and Allergy, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany
| | | | - Sven Roy Quist
- 5Clinic of Dermatology, Otto-von-Guericke University, Magdeburg, Germany.,Skin Center MDZ, Mainz, Germany
| | - Martin Schmelz
- 7Department of Experimental Pain Research, CBTM, Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany
| | - Per Stahl Skov
- RefLab ApS, Copenhagen, Denmark.,8Odense Research Center for Anaphylaxis (ORCA), Department of Dermatology and Allergy Center, Odense University Hospital, Odense, Denmark
| | - Chris D Anderson
- 9Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - Line Kring Tannert
- 8Odense Research Center for Anaphylaxis (ORCA), Department of Dermatology and Allergy Center, Odense University Hospital, Odense, Denmark
| | - Ana Maria Giménez-Arnau
- 10Department of Dermatology, Hospital del Mar, Institut Mar d'Investigacions Mèdiques, Universitat Autònoma, Barcelona, Spain
| | - Stefan Frischbutter
- 3Department of Dermatology and Allergy, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany
| | - Jörg Scheffel
- 3Department of Dermatology and Allergy, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany
| | - Marcus Maurer
- 3Department of Dermatology and Allergy, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany
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24
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Xiao T, Wang Y, Wei H, Yu P, Jiang Y, Mao L. Electrochemical Monitoring of Propagative Fluctuation of Ascorbate in the Live Rat Brain during Spreading Depolarization. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201901035] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Tongfang Xiao
- Beijing National Laboratory for Molecular SciencesKey Laboratory of Analytical Chemistry for Living BiosystemsInstitute of Chemistry, theChinese Academy of Sciences (CAS)CAS Research/Education Center for Excellence in Molecular Science Beijing 100190 China
| | - Yuexiang Wang
- Beijing National Laboratory for Molecular SciencesKey Laboratory of Analytical Chemistry for Living BiosystemsInstitute of Chemistry, theChinese Academy of Sciences (CAS)CAS Research/Education Center for Excellence in Molecular Science Beijing 100190 China
| | - Huan Wei
- Beijing National Laboratory for Molecular SciencesKey Laboratory of Analytical Chemistry for Living BiosystemsInstitute of Chemistry, theChinese Academy of Sciences (CAS)CAS Research/Education Center for Excellence in Molecular Science Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Ping Yu
- Beijing National Laboratory for Molecular SciencesKey Laboratory of Analytical Chemistry for Living BiosystemsInstitute of Chemistry, theChinese Academy of Sciences (CAS)CAS Research/Education Center for Excellence in Molecular Science Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Ying Jiang
- Beijing National Laboratory for Molecular SciencesKey Laboratory of Analytical Chemistry for Living BiosystemsInstitute of Chemistry, theChinese Academy of Sciences (CAS)CAS Research/Education Center for Excellence in Molecular Science Beijing 100190 China
| | - Lanqun Mao
- Beijing National Laboratory for Molecular SciencesKey Laboratory of Analytical Chemistry for Living BiosystemsInstitute of Chemistry, theChinese Academy of Sciences (CAS)CAS Research/Education Center for Excellence in Molecular Science Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
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25
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Khan M, Boutelle M. The military applications of physiological sensors. TRAUMA-ENGLAND 2019. [DOI: 10.1177/1460408618810702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Mansoor Khan
- Academic Department of Military Surgery and Trauma, Royal Centre for Defence Medicine, Birmingham, UK
| | - Martyn Boutelle
- Department of Bioengineering, Imperial College London, London, UK
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26
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Hobbs CN, Johnson JA, Verber MD, Mark Wightman R. An implantable multimodal sensor for oxygen, neurotransmitters, and electrophysiology during spreading depolarization in the deep brain. Analyst 2018; 142:2912-2920. [PMID: 28715004 DOI: 10.1039/c7an00508c] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Brain tissue injury is often accompanied by spreading depolarization (SD) events, marked by widespread cellular depolarization and cessation of neuronal firing. SD recruits viable tissue into the lesion, making it a focus for intervention. During SD, drastic fluctuations occur in ion gradients, extracellular neurotransmitter concentrations, cellular metabolism, and cerebral blood flow. Measuring SD requires a multimodal approach to capture the array of changes. However, the use of multiple sensors can inflict tissue damage. Here, we use carbon-fiber microelectrodes to characterize several aspects of SD with a single, minimally invasive sensor in the deep brain region of the nucleus accumbens. Fast-scan cyclic voltammetry detects large changes in oxygen, which reflect the balance between cerebral blood flow and energy consumption, and also supraphysiological release of electroactive neurotransmitters (i.e., dopamine). We verify waves of SD with concurrent single-unit or DC potential electrophysiological recordings. The single-unit recordings reveal bursts of action potentials followed by inactivity. The DC potentials exhibit a slow negative voltage shift in the extracellular space indicative of wide-spread cellular depolarization. Here, we characterize the multiple modalities of our sensor and demonstrate its utility for improved SD recordings.
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Affiliation(s)
- Caddy N Hobbs
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
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27
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Phairatana T, Leong CL, Gowers SAN, Patel BA, Boutelle MG. Real-time detection of carboplatin using a microfluidic system. Analyst 2018; 141:6270-6277. [PMID: 27796386 PMCID: PMC5123639 DOI: 10.1039/c6an01446a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel on-line microfluidic assay for the chemotherapy agent carboplatin will allow sensitive detection of the drug directly applied to the tumour as it emerges from the tumour into healthy tissue.
A microfluidic sensor system based on a carbon nanotube-epoxy composite electrode was fabricated to allow detection of the presence of the anti-cancer drug carboplatin in healthy tissue in real time during chemotherapy. Detection of carboplatin was carried out by observing the effects of the drug on the differential pulse voltammetry of free purine bases using a novel carbon nanotube-epoxy composite electrode. In free solution these electrodes performed better than glassy carbon electrodes for oxidation of the free purine bases AMP and GMP, and than DNA-modified carbon nanotube-epoxy composite sensors for detection of carboplatin. On-line carboplatin detection was performed using a computer-controlled microfluidic platform. The methodology for on-line carboplatin detection was optimised in terms of the analysis time and to allow repeated carboplatin measurement using the same electrode. Microdialysis sampling and our microfluidic platform were combined to give a proof-of-concept system for real-time carboplatin detection with a limit of detection of 0.014 μM carboplatin in the sampled media. This paper is dedicated to Craig Lunte's pioneering work in analysis and microdialysis.
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Affiliation(s)
- Tonghathai Phairatana
- Institute of Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand. and Department of Bioengineering, Faculty of Engineering, Imperial College London, London, UK.
| | - Chi Leng Leong
- Department of Bioengineering, Faculty of Engineering, Imperial College London, London, UK.
| | - Sally A N Gowers
- Department of Bioengineering, Faculty of Engineering, Imperial College London, London, UK.
| | - Bhavik Anil Patel
- School of Pharmacy and Biomolecular Sciences, University of Brighton, East Sussex, UK
| | - Martyn G Boutelle
- Department of Bioengineering, Faculty of Engineering, Imperial College London, London, UK.
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28
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Pagkalos I, Rogers ML, Boutelle MG, Drakakis EM. A High-Performance Application Specific Integrated Circuit for Electrical and Neurochemical Traumatic Brain Injury Monitoring. Chemphyschem 2018; 19:1215-1225. [PMID: 29388305 PMCID: PMC6016079 DOI: 10.1002/cphc.201701119] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2017] [Revised: 01/25/2018] [Indexed: 11/11/2022]
Abstract
This paper presents the first application specific integrated chip (ASIC) for the monitoring of patients who have suffered a Traumatic Brain Injury (TBI). By monitoring the neurophysiological (ECoG) and neurochemical (glucose, lactate and potassium) signals of the injured human brain tissue, it is possible to detect spreading depolarisations, which have been shown to be associated with poor TBI patient outcome. This paper describes the testing of a new 7.5 mm2 ASIC fabricated in the commercially available AMS 0.35 μm CMOS technology. The ASIC has been designed to meet the demands of processing the injured brain tissue's ECoG signals, recorded by means of depth or brain surface electrodes, and neurochemical signals, recorded using microdialysis coupled to microfluidics-based electrochemical biosensors. The potentiostats use switchedcapacitor charge integration to record currents with 100 fA resolution, and allow automatic gain changing to track the falling sensitivity of a biosensor. This work supports the idea of a "behind the ear" wireless microplatform modality, which could enable the monitoring of currently non-monitored mobile TBI patients for the onset of secondary brain injury.
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29
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Li B, Fan Y, Li C, Zhao X, Liu K, Lin Y. Online Electrochemical Monitoring of Glucose in Rat Brain with Acanthosphere-like CuOOH Nanospheres-based Electrochemical Sensor as Non-enzymatic and O2
-independent Detector. ELECTROANAL 2018. [DOI: 10.1002/elan.201700574] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Bo Li
- Department of Chemistry; Capital Normal University; Beijing 100048 China
| | - Yongzhao Fan
- Capital University of Physical Education and Sports; Beijing 100191 P. R. China
| | - Changqing Li
- Department of Chemistry; Capital Normal University; Beijing 100048 China
| | - Xu Zhao
- Department of Chemistry; Capital Normal University; Beijing 100048 China
| | - Kun Liu
- Capital University of Physical Education and Sports; Beijing 100191 P. R. China
| | - Yuqing Lin
- Department of Chemistry; Capital Normal University; Beijing 100048 China
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30
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Cerebrospinal fluid and brain extracellular fluid in severe brain trauma. HANDBOOK OF CLINICAL NEUROLOGY 2018; 146:237-258. [DOI: 10.1016/b978-0-12-804279-3.00014-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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31
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Hobbs CN, Holzberg G, Min AS, Wightman RM. Comparison of Spreading Depolarizations in the Motor Cortex and Nucleus Accumbens: Similar Patterns of Oxygen Responses and the Role of Dopamine. ACS Chem Neurosci 2017; 8:2512-2521. [PMID: 28820571 PMCID: PMC5691918 DOI: 10.1021/acschemneuro.7b00266] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Spreading depolarizations (SD) are pathophysiological phenomena that spontaneously arise in traumatized neural tissue and can promote cellular death. Most investigations of SD are performed in the cortex, a brain region that is susceptible to these depolarizing waves and accessible via a variety of monitoring techniques. Here, we describe SD responses in the cortex and the deep brain region of the nucleus accumbens (NAc) of the anesthetized rat with a minimally invasive, implantable sensor. With high temporal resolution, we characterize the time course of oxygen responses to SD in relation to the electrophysiological depolarization signal. The predominant oxygen pattern consists of four phases: (1) a small initial decrease, (2) a large increase during the SD, (3) a delayed increase, and (4) a persistent decrease from baseline after the SD. Oxygen decreases during SD were also recorded. The latter response occurred more often in the NAc than the cortex (56% vs 20% of locations, respectively), which correlates to denser cortical vascularization. We also find that SDs travel more quickly in the cortex than NAc, likely affected by regional differences in cell type populations. Finally, we investigate the previously uncharacterized effects of dopamine release during SD in the NAc with dopamine receptor blockade. Our results support an inhibitory role of the D2 receptor on SD. As such, the data presented here expands the current understanding of within- and between-region variance in responses to SD.
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Affiliation(s)
- Caddy N. Hobbs
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Gordon Holzberg
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Akira S. Min
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - R. Mark Wightman
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
- Neuroscience Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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32
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Varner EL, Leong CL, Jaquins-Gerstl A, Nesbitt KM, Boutelle MG, Michael AC. Enhancing Continuous Online Microdialysis Using Dexamethasone: Measurement of Dynamic Neurometabolic Changes during Spreading Depolarization. ACS Chem Neurosci 2017; 8:1779-1788. [PMID: 28482157 DOI: 10.1021/acschemneuro.7b00148] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Microdialysis is well established in chemical neuroscience as a mainstay technology for real time intracranial chemical monitoring in both animal models and human patients. Evidence shows that microdialysis can be enhanced by mitigating the penetration injury caused during the insertion of microdialysis probes into brain tissue. Herein, we show that retrodialysis of dexamethasone in the rat cortex enhances the microdialysis detection of K+ and glucose transients induced by spreading depolarization. Without dexamethasone, quantification of glucose transients was unreliable by 5 days after probe insertion. With dexamethasone, robust K+ and glucose transients were readily quantified at 2 h, 5 days, and 10 days after probe insertion. The amplitudes of the K+ transients declined day-to-day following probe insertion, and the amplitudes of the glucose transients exhibited a decreasing trend that did not reach statistical significance. Immunohistochemistry and fluorescence microscopy confirm that dexamethasone is highly effective at preserving a healthy probe-brain interface for at least 10 days even though retrodialysis of dexamethasone ceased after 5 days.
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Affiliation(s)
- Erika L. Varner
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Chi Leng Leong
- Department
of Bioengineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - Andrea Jaquins-Gerstl
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Kathryn M. Nesbitt
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Martyn G. Boutelle
- Department
of Bioengineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - Adrian C. Michael
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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33
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Sánchez-Guerrero A, Mur-Bonet G, Vidal-Jorge M, Gándara-Sabatini D, Chocrón I, Cordero E, Poca MA, Mullen K, Sahuquillo J. Reappraisal of the reference levels for energy metabolites in the extracellular fluid of the human brain. J Cereb Blood Flow Metab 2017; 37:2742-2755. [PMID: 27742889 PMCID: PMC5536785 DOI: 10.1177/0271678x16674222] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 08/21/2016] [Accepted: 09/15/2016] [Indexed: 11/16/2022]
Abstract
Cerebral microdialysis is widely used in neurocritical care units. The goal of this study was to establish the reference interval for the interstitial fluid concentrations of energy metabolites and glycerol by using the extrapolation to zero-flow methodology in anesthetized patients and by constant perfusion at 0.3 µL/min in awake patients. A CMA-71 probe was implanted during surgery in normal white matter of patients with posterior fossa or supratentorial lesions, and the perfusion flow rate was randomized to 0.1, 0.3, 0.6, 1.2, and 2.4 µL/min. Within 24 h of surgery, perfusion was restarted at a constant 0.3 µL/min in fully awake patients. The actual interstitial fluid metabolite concentrations were calculated using the zero-flow methodology. In vitro experiments were also conducted to evaluate the reproducibility of the in vivo methodology. Nineteen patients (seven males) with a median age of 44 years (range: 21-69) were included in the in vivo study. The median (lower-upper) reference interval values were 1.57 (1.15-4.13 mmol/L) for glucose, 2.01 (1.30-5.31 mmol/L) for lactate, 80.0 (54.4-197.0 µmol/L) for pyruvate, and 49.9 (23.6-227.3 µmol/L) for glycerol. The reference intervals reported raises the need to reconsider traditional definitions of brain metabolic disturbances and emphasize the importance of using different thresholds for awake patients and patients under anesthesia.
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Affiliation(s)
- Angela Sánchez-Guerrero
- Neurotraumatology and Neurosurgery Research Unit (UNINN), Vall d’Hebron Research Institute, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Gemma Mur-Bonet
- Neurotraumatology and Neurosurgery Research Unit (UNINN), Vall d’Hebron Research Institute, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Marian Vidal-Jorge
- Neurotraumatology and Neurosurgery Research Unit (UNINN), Vall d’Hebron Research Institute, Universitat Autònoma de Barcelona, Barcelona, Spain
| | | | - Ivette Chocrón
- Department of Anesthesiology, Vall d’Hebron University Hospital, Barcelona, Spain
| | - Esteban Cordero
- Department of Neurosurgery, Vall d’Hebron University Hospital, Barcelona, Spain
| | - Maria-Antonia Poca
- Neurotraumatology and Neurosurgery Research Unit (UNINN), Vall d’Hebron Research Institute, Universitat Autònoma de Barcelona, Barcelona, Spain
- Department of Neurosurgery, Vall d’Hebron University Hospital, Barcelona, Spain
| | | | - Juan Sahuquillo
- Neurotraumatology and Neurosurgery Research Unit (UNINN), Vall d’Hebron Research Institute, Universitat Autònoma de Barcelona, Barcelona, Spain
- Department of Neurosurgery, Vall d’Hebron University Hospital, Barcelona, Spain
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34
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Lourenço CF, Ledo A, Gerhardt GA, Laranjinha J, Barbosa RM. Neurometabolic and electrophysiological changes during cortical spreading depolarization: multimodal approach based on a lactate-glucose dual microbiosensor arrays. Sci Rep 2017; 7:6764. [PMID: 28754993 PMCID: PMC5533760 DOI: 10.1038/s41598-017-07119-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 06/21/2017] [Indexed: 12/24/2022] Open
Abstract
Spreading depolarization (SD) is a slow propagating wave of strong depolarization of neural cells, implicated in several neuropathological conditions. The breakdown of brain homeostasis promotes significant hemodynamic and metabolic alterations, which impacts on neuronal function. In this work we aimed to develop an innovative multimodal approach, encompassing metabolic, electric and hemodynamic measurements, tailored but not limited to study SD. This was based on a novel dual-biosensor based on microelectrode arrays designed to simultaneously monitor lactate and glucose fluctuations and ongoing neuronal activity with high spatial and temporal resolution. In vitro evaluation of dual lactate-glucose microbiosensor revealed an extended linear range, high sensitivity and selectivity, fast response time and low oxygen-, temperature- and pH- dependencies. In anesthetized rats, we measured with the same array a significant drop in glucose concentration matched to a rise in lactate and concurrently with pronounced changes in the spectral profile of LFP-related currents during episodes of mechanically-evoked SD. This occurred along with the stereotypical hemodynamic response of the SD wave. Overall, this multimodal approach successfully demonstrates the capability to monitor metabolic alterations and ongoing electrical activity, thus contributing to a better understanding of the metabolic changes occurring in the brain following SD.
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Affiliation(s)
- Cátia F Lourenço
- Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal.
| | - Ana Ledo
- Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - Greg A Gerhardt
- Center for Microelectrode Technology, University of Kentucky, Lexington, USA
| | - João Laranjinha
- Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal.,Faculty of Pharmacy, University of Coimbra, Coimbra, Portugal
| | - Rui M Barbosa
- Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal. .,Faculty of Pharmacy, University of Coimbra, Coimbra, Portugal.
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35
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Davis AN, Travis AR, Miller DR, Cliffel DE. Multianalyte Physiological Microanalytical Devices. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2017; 10:93-111. [PMID: 28605606 PMCID: PMC9235322 DOI: 10.1146/annurev-anchem-061516-045334] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Advances in scientific instrumentation have allowed experimentalists to evaluate well-known systems in new ways and to gain insight into previously unexplored or poorly understood phenomena. Within the growing field of multianalyte physiometry (MAP), microphysiometers are being developed that are capable of electrochemically measuring changes in the concentration of various metabolites in real time. By simultaneously quantifying multiple analytes, these devices have begun to unravel the complex pathways that govern biological responses to ischemia and oxidative stress while contributing to basic scientific discoveries in bioenergetics and neurology. Patients and clinicians have also benefited from the highly translational nature of MAP, and the continued expansion of the repertoire of analytes that can be measured with multianalyte microphysiometers will undoubtedly play a role in the automation and personalization of medicine. This is perhaps most evident with the recent advent of fully integrated noninvasive sensor arrays that can continuously monitor changes in analytes linked to specific disease states and deliver a therapeutic agent as required without the need for patient action.
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Affiliation(s)
- Anna Nix Davis
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235;
| | - Adam R Travis
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235;
| | - Dusty R Miller
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235;
| | - David E Cliffel
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235;
- Vanderbilt Institute for Integrative Biosystems Research and Education, Vanderbilt University, Nashville, Tennessee 37235
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36
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Johnson JA, Hobbs CN, Wightman RM. Removal of Differential Capacitive Interferences in Fast-Scan Cyclic Voltammetry. Anal Chem 2017; 89:6166-6174. [PMID: 28488873 PMCID: PMC5685151 DOI: 10.1021/acs.analchem.7b01005] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Due to its high spatiotemporal resolution, fast-scan cyclic voltammetry (FSCV) at carbon-fiber microelectrodes enables the localized in vivo monitoring of subsecond fluctuations in electroactive neurotransmitter concentrations. In practice, resolution of the analytical signal relies on digital background subtraction for removal of the large current due to charging of the electrical double layer as well as surface faradaic reactions. However, fluctuations in this background current often occur with changes in the electrode state or ionic environment, leading to nonspecific contributions to the FSCV data that confound data analysis. Here, we both explore the origin of such shifts seen with local changes in cations and develop a model to account for their shape. Further, we describe a convolution-based method for removal of the differential capacitive contributions to the FSCV current. The method relies on the use of a small-amplitude pulse made prior to the FSCV sweep that probes the impedance of the system. To predict the nonfaradaic current response to the voltammetric sweep, the step current response is differentiated to provide an estimate of the system's impulse response function and is used to convolute the applied waveform. The generated prediction is then subtracted from the observed current to the voltammetric sweep, removing artifacts associated with electrode impedance changes. The technique is demonstrated to remove select contributions from capacitive characteristics changes of the electrode both in vitro (i.e., in flow-injection analysis) and in vivo (i.e., during a spreading depression event in an anesthetized rat).
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Affiliation(s)
- Justin A Johnson
- Department of Chemistry and ‡Neuroscience Center and Neurobiology Curriculum, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-3290, United States
| | - Caddy N Hobbs
- Department of Chemistry and ‡Neuroscience Center and Neurobiology Curriculum, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-3290, United States
| | - R Mark Wightman
- Department of Chemistry and ‡Neuroscience Center and Neurobiology Curriculum, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-3290, United States
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37
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Balança B, Meiller A, Bezin L, Dreier JP, Marinesco S, Lieutaud T. Altered hypermetabolic response to cortical spreading depolarizations after traumatic brain injury in rats. J Cereb Blood Flow Metab 2017; 37:1670-1686. [PMID: 27356551 PMCID: PMC5435292 DOI: 10.1177/0271678x16657571] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 05/27/2016] [Accepted: 05/30/2016] [Indexed: 01/11/2023]
Abstract
Spreading depolarizations are waves of near-complete breakdown of neuronal transmembrane ion gradients, free energy starving, and mass depolarization. Spreading depolarizations in electrically inactive tissue are associated with poor outcome in patients with traumatic brain injury. Here, we studied changes in regional cerebral blood flow and brain oxygen (PbtO2), glucose ([Glc]b), and lactate ([Lac]b) concentrations in rats, using minimally invasive real-time sensors. Rats underwent either spreading depolarizations chemically triggered by KCl in naïve cortex in absence of traumatic brain injury or spontaneous spreading depolarizations in the traumatic penumbra after traumatic brain injury, or a cluster of spreading depolarizations triggered chemically by KCl in a remote window from which spreading depolarizations invaded penumbral tissue. Spreading depolarizations in noninjured cortex induced a hypermetabolic response characterized by a decline in [Glc]b and monophasic increases in regional cerebral blood flow, PbtO2, and [Lac]b, indicating transient hyperglycolysis. Following traumatic brain injury, spontaneous spreading depolarizations occurred, causing further decline in [Glc]b and reducing the increase in regional cerebral blood flow and biphasic responses of PbtO2 and [Lac]b, followed by prolonged decline. Recovery of PbtO2 and [Lac]b was significantly delayed in traumatized animals. Prespreading depolarization [Glc]b levels determined the metabolic response to clusters. The results suggest a compromised hypermetabolic response to spreading depolarizations and slower return to physiological conditions following traumatic brain injury-induced spreading depolarizations.
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Affiliation(s)
- Baptiste Balança
- Inserm U1028, CNRS UMR 5292, Lyon Neuroscience Research Center, Team TIGER, Lyon, France
- Centre hospitalier universitaire de Lyon, France
| | - Anne Meiller
- Université Claude Bernard Lyon I, Lyon Neuroscience Research Center, AniRA-Neurochem Technological platform, Lyon, France
| | - Laurent Bezin
- Inserm U1028, CNRS UMR 5292, Lyon Neuroscience Research Center, Team TIGER, Lyon, France
| | - Jens P. Dreier
- Center for Stroke Research Berlin, Charité University Medicine Berlin, Berlin, Germany
- Department of Neurology and Department of Experimental Neurology, Charité University Medicine Berlin, Berlin, Germany
| | - Stéphane Marinesco
- Inserm U1028, CNRS UMR 5292, Lyon Neuroscience Research Center, Team TIGER, Lyon, France
- Université Claude Bernard Lyon I, Lyon Neuroscience Research Center, AniRA-Neurochem Technological platform, Lyon, France
| | - Thomas Lieutaud
- Inserm U1028, CNRS UMR 5292, Lyon Neuroscience Research Center, Team TIGER, Lyon, France
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38
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Rogers ML, Leong CL, Gowers SA, Samper IC, Jewell SL, Khan A, McCarthy L, Pahl C, Tolias CM, Walsh DC, Strong AJ, Boutelle MG. Simultaneous monitoring of potassium, glucose and lactate during spreading depolarization in the injured human brain - Proof of principle of a novel real-time neurochemical analysis system, continuous online microdialysis. J Cereb Blood Flow Metab 2017; 37:1883-1895. [PMID: 27798268 PMCID: PMC5414898 DOI: 10.1177/0271678x16674486] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Spreading depolarizations occur spontaneously and frequently in injured human brain. They propagate slowly through injured tissue often cycling around a local area of damage. Tissue recovery after an spreading depolarization requires greatly augmented energy utilisation to normalise ionic gradients from a virtually complete loss of membrane potential. In the injured brain, this is difficult because local blood flow is often low and unreactive. In this study, we use a new variant of microdialysis, continuous on-line microdialysis, to observe the effects of spreading depolarizations on brain metabolism. The neurochemical changes are dynamic and take place on the timescale of the passage of an spreading depolarization past the microdialysis probe. Dialysate potassium levels provide an ionic correlate of cellular depolarization and show a clear transient increase. Dialysate glucose levels reflect a balance between local tissue glucose supply and utilisation. These show a clear transient decrease of variable magnitude and duration. Dialysate lactate levels indicate non-oxidative metabolism of glucose and show a transient increase. Preliminary data suggest that the transient changes recover more slowly after the passage of a sequence of multiple spreading depolarizations giving rise to a decrease in basal dialysate glucose and an increase in basal dialysate potassium and lactate levels.
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Affiliation(s)
| | - Chi Leng Leong
- 1 Department of Bioengineering, Imperial College, London, UK
| | - Sally An Gowers
- 1 Department of Bioengineering, Imperial College, London, UK
| | | | - Sharon L Jewell
- 2 Department of Basic and Clinical Neuroscience, King's College, London, UK
| | - Asma Khan
- 2 Department of Basic and Clinical Neuroscience, King's College, London, UK
| | - Leanne McCarthy
- 2 Department of Basic and Clinical Neuroscience, King's College, London, UK
| | - Clemens Pahl
- 2 Department of Basic and Clinical Neuroscience, King's College, London, UK.,3 King's College Hospital NHS Foundation Trust, London, UK
| | - Christos M Tolias
- 2 Department of Basic and Clinical Neuroscience, King's College, London, UK.,3 King's College Hospital NHS Foundation Trust, London, UK
| | - Daniel C Walsh
- 2 Department of Basic and Clinical Neuroscience, King's College, London, UK.,3 King's College Hospital NHS Foundation Trust, London, UK
| | - Anthony J Strong
- 2 Department of Basic and Clinical Neuroscience, King's College, London, UK
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39
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Cunnea P, Gowers S, Moore JE, Drakakis E, Boutelle M, Fotopoulou C. Review article: Novel technologies in the treatment and monitoring of advanced and relapsed epithelial ovarian cancer. CONVERGENT SCIENCE PHYSICAL ONCOLOGY 2017. [PMID: 29515912 DOI: 10.1088/2057-1739/aa5cf1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Epithelial Ovarian cancer (EOC) is the fifth most common cause of cancer death in females in the UK. It has long been recognized to be a set of heterogeneous diseases, with high grade serous being the most common subtype. The majority of patients with EOC present at an advanced stage (FIGO III-IV), and have the largest risk for disease recurrence from which a high percentage will develop resistance to chemotherapy. Despite continual advances in diagnostics, imaging, surgery and treatment of EOC, there has been little variation in the survival rates for patients with EOC. In this review we will introduce novel bioengineering advances in modelling the lymphatic system and real-time tissue monitoring to improve the clinical and therapeutic outcome for patients with EOC. We discuss the advent of the non-invasive "liquid biopsy" in the surveillance of patients undergoing treatment and follow-up. Finally, we present new bioengineering advances for palliative care of patients to lessen symptoms of patients with ascites and improve quality of life.
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Affiliation(s)
- Paula Cunnea
- Department of Surgery and Cancer, Imperial College London
| | - Sally Gowers
- Department of Bioengineering, Imperial College London
| | - James E Moore
- Department of Bioengineering, Imperial College London
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40
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Ganesana M, Lee ST, Wang Y, Venton BJ. Analytical Techniques in Neuroscience: Recent Advances in Imaging, Separation, and Electrochemical Methods. Anal Chem 2017; 89:314-341. [PMID: 28105819 PMCID: PMC5260807 DOI: 10.1021/acs.analchem.6b04278] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
| | | | | | - B. Jill Venton
- Department of Chemistry, PO Box 400319, University of Virginia, Charlottesville, VA 22904
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41
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Toth P, Szarka N, Farkas E, Ezer E, Czeiter E, Amrein K, Ungvari Z, Hartings JA, Buki A, Koller A. Traumatic brain injury-induced autoregulatory dysfunction and spreading depression-related neurovascular uncoupling: Pathomechanisms, perspectives, and therapeutic implications. Am J Physiol Heart Circ Physiol 2016; 311:H1118-H1131. [PMID: 27614225 PMCID: PMC5504422 DOI: 10.1152/ajpheart.00267.2016] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 08/19/2016] [Indexed: 01/17/2023]
Abstract
Traumatic brain injury (TBI) is a major health problem worldwide. In addition to its high mortality (35-40%), survivors are left with cognitive, behavioral, and communicative disabilities. While little can be done to reverse initial primary brain damage caused by trauma, the secondary injury of cerebral tissue due to cerebromicrovascular alterations and dysregulation of cerebral blood flow (CBF) is potentially preventable. This review focuses on functional, cellular, and molecular changes of autoregulatory function of CBF (with special focus on cerebrovascular myogenic response) that occur in cerebral circulation after TBI and explores the links between autoregulatory dysfunction, impaired myogenic response, microvascular impairment, and the development of secondary brain damage. We further provide a synthesized translational view of molecular and cellular mechanisms involved in cortical spreading depolarization-related neurovascular dysfunction, which could be targeted for the prevention or amelioration of TBI-induced secondary brain damage.
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Affiliation(s)
- Peter Toth
- Department of Neurosurgery, University of Pecs, Pecs, Hungary;
- Janos Szentagothai Research Centre, University of Pecs, Pecs, Hungary
- Department of Geriatric Medicine, Reynolds Oklahoma Center on Aging, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
| | - Nikolett Szarka
- Department of Neurosurgery, University of Pecs, Pecs, Hungary
- Department of Translational Medicine, University of Pecs, Pecs, Hungary
| | - Eszter Farkas
- Faculty of Medicine and Faculty of Science and Informatics, Department of Medical Physics and Informatics, University of Szeged, Szeged, Hungary
| | - Erzsebet Ezer
- Department of Neurosurgery, University of Pecs, Pecs, Hungary
| | - Endre Czeiter
- Department of Neurosurgery, University of Pecs, Pecs, Hungary
- Janos Szentagothai Research Centre, University of Pecs, Pecs, Hungary
- MTA-PTE Clinical Neuroscience MR Research Group, Pecs, Hungary
| | - Krisztina Amrein
- Department of Neurosurgery, University of Pecs, Pecs, Hungary
- Janos Szentagothai Research Centre, University of Pecs, Pecs, Hungary
- MTA-PTE Clinical Neuroscience MR Research Group, Pecs, Hungary
| | - Zoltan Ungvari
- Department of Geriatric Medicine, Reynolds Oklahoma Center on Aging, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
| | - Jed A Hartings
- Department of Neurosurgery, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Andras Buki
- Department of Neurosurgery, University of Pecs, Pecs, Hungary
- Janos Szentagothai Research Centre, University of Pecs, Pecs, Hungary
- MTA-PTE Clinical Neuroscience MR Research Group, Pecs, Hungary
| | - Akos Koller
- Department of Neurosurgery, University of Pecs, Pecs, Hungary
- Janos Szentagothai Research Centre, University of Pecs, Pecs, Hungary
- Institute of Natural Sciences, University of Physical Education, Budapest, Hungary; and
- Department of Physiology, New York Medical College, Valhalla, New York
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42
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Abstract
Microdialysis enables the chemistry of the extracellular interstitial space to be monitored. Use of this technique in patients with acute brain injury has increased our understanding of the pathophysiology of several acute neurological disorders. In 2004, a consensus document on the clinical application of cerebral microdialysis was published. Since then, there have been significant advances in the clinical use of microdialysis in neurocritical care. The objective of this review is to report on the International Microdialysis Forum held in Cambridge, UK, in April 2014 and to produce a revised and updated consensus statement about its clinical use including technique, data interpretation, relationship with outcome, role in guiding therapy in neurocritical care and research applications.
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43
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Su CK, Yen SC, Li TW, Sun YC. Enzyme-Immobilized 3D-Printed Reactors for Online Monitoring of Rat Brain Extracellular Glucose and Lactate. Anal Chem 2016; 88:6265-73. [DOI: 10.1021/acs.analchem.6b00272] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cheng-Kuan Su
- Department
of Bioscience and Biotechnology, National Taiwan Ocean University, Keelung, 20224, Taiwan
| | - Shuo-Chih Yen
- Department
of Biomedical Engineering and Environmental Sciences, National Tsing-Hua University, Hsinchu, 30013, Taiwan
| | - Tzu-Wen Li
- Department
of Biomedical Engineering and Environmental Sciences, National Tsing-Hua University, Hsinchu, 30013, Taiwan
| | - Yuh-Chang Sun
- Department
of Biomedical Engineering and Environmental Sciences, National Tsing-Hua University, Hsinchu, 30013, Taiwan
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44
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Papadimitriou KI, Wang C, Rogers ML, Gowers SAN, Leong CL, Boutelle MG, Drakakis EM. High-Performance Bioinstrumentation for Real-Time Neuroelectrochemical Traumatic Brain Injury Monitoring. Front Hum Neurosci 2016; 10:212. [PMID: 27242477 PMCID: PMC4871864 DOI: 10.3389/fnhum.2016.00212] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Accepted: 04/25/2016] [Indexed: 01/18/2023] Open
Abstract
Traumatic brain injury (TBI) has been identified as an important cause of death and severe disability in all age groups and particularly in children and young adults. Central to TBIs devastation is a delayed secondary injury that occurs in 30-40% of TBI patients each year, while they are in the hospital Intensive Care Unit (ICU). Secondary injuries reduce survival rate after TBI and usually occur within 7 days post-injury. State-of-art monitoring of secondary brain injuries benefits from the acquisition of high-quality and time-aligned electrical data i.e., ElectroCorticoGraphy (ECoG) recorded by means of strip electrodes placed on the brains surface, and neurochemical data obtained via rapid sampling microdialysis and microfluidics-based biosensors measuring brain tissue levels of glucose, lactate and potassium. This article progresses the field of multi-modal monitoring of the injured human brain by presenting the design and realization of a new, compact, medical-grade amperometry, potentiometry and ECoG recording bioinstrumentation. Our combined TBI instrument enables the high-precision, real-time neuroelectrochemical monitoring of TBI patients, who have undergone craniotomy neurosurgery and are treated sedated in the ICU. Electrical and neurochemical test measurements are presented, confirming the high-performance of the reported TBI bioinstrumentation.
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Affiliation(s)
- Konstantinos I. Papadimitriou
- Department of Bioengineering, Imperial College LondonLondon, UK
- Bioinspired VLSI Circuits and Systems GroupLondon, UK
| | - Chu Wang
- Department of Bioengineering, Imperial College LondonLondon, UK
- Biomedical Sensors GroupLondon, UK
| | - Michelle L. Rogers
- Department of Bioengineering, Imperial College LondonLondon, UK
- Biomedical Sensors GroupLondon, UK
| | - Sally A. N. Gowers
- Department of Bioengineering, Imperial College LondonLondon, UK
- Biomedical Sensors GroupLondon, UK
| | - Chi L. Leong
- Department of Bioengineering, Imperial College LondonLondon, UK
- Biomedical Sensors GroupLondon, UK
| | - Martyn G. Boutelle
- Department of Bioengineering, Imperial College LondonLondon, UK
- Biomedical Sensors GroupLondon, UK
| | - Emmanuel M. Drakakis
- Department of Bioengineering, Imperial College LondonLondon, UK
- Bioinspired VLSI Circuits and Systems GroupLondon, UK
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Wang X, Li Q, Xu J, Wu S, Xiao T, Hao J, Yu P, Mao L. Rational Design of Bioelectrochemically Multifunctional Film with Oxidase, Ferrocene, and Graphene Oxide for Development of in Vivo Electrochemical Biosensors. Anal Chem 2016; 88:5885-91. [PMID: 27146343 DOI: 10.1021/acs.analchem.6b00720] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
This study demonstrates a new strategy to develop in vivo electrochemical biosensors through rational design and simple formation of bioelectrochemically multifunctional film (BMF). The BMF is rationally designed by first efficiently incorporating oxidase, ferrocene mediator, and graphene oxide into polymaleimidostyrene/polystyrene (PMS/PS) matrix to form a homogeneous mixture and then simply formed by drop-coating the mixture onto solid conducting substrate. By using the as-formed BMF, electrochemical biosensors could be constructed with a technical simplicity and high reproducibility. To illustrate the BMF-based biosensors for in vivo applications, we directly couple the biosensors to in vivo microdialysis to establish an online electrochemical system (OECS) for in vivo monitoring of glucose in rat auditory cortex during salicylate-induced tinnitus model. The OECS with the BMF-based biosensor as the detector shows a linear response toward glucose within a concentration range from 50 to 500 μM with a detection limit of 10 μM (S/N = 3). Additionally, the OECS is stable and does not suffer from the interference from the electroactive species endogenously coexisting in the brain microdialysate. With the BMF-based OECS, the basal level of glucose in the microdialysate continuously sampled from rat auditory cortex is determined to be 120 ± 10 μM (n = 5). After the rats were administrated with salicylate to induce transient tinnitus, the microdialysate glucose concentration in the rat auditory cortex remarkably increased to 433 ± 190 μM (n = 5) at the time point of 1.5 h. This study essentially offers a new, technically simple and reproducible approach to development of in vivo electrochemical biosensors, which is envisaged to be relatively useful for understanding of the molecular basis of brain functions.
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Affiliation(s)
- Xiuyun Wang
- School of Chemistry, Faculty of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology , Dalian 116024, China
| | - Qian Li
- School of Chemistry, Faculty of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology , Dalian 116024, China
| | - Jingjing Xu
- School of Chemistry, Faculty of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology , Dalian 116024, China
| | - Shuo Wu
- School of Chemistry, Faculty of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology , Dalian 116024, China
| | - Tongfang Xiao
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, The Chinese Academy of Sciences (CAS) , Beijing 100190, China
| | - Jie Hao
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, The Chinese Academy of Sciences (CAS) , Beijing 100190, China
| | - Ping Yu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, The Chinese Academy of Sciences (CAS) , Beijing 100190, China
| | - Lanqun Mao
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, The Chinese Academy of Sciences (CAS) , Beijing 100190, China
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Li C, Limnuson K, Wu Z, Amin A, Narayan A, Golanov EV, Ahn CH, Hartings JA, Narayan RK. Single probe for real-time simultaneous monitoring of neurochemistry and direct-current electrocorticography. Biosens Bioelectron 2016; 77:62-8. [DOI: 10.1016/j.bios.2015.09.021] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Revised: 09/09/2015] [Accepted: 09/10/2015] [Indexed: 01/25/2023]
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47
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Trouillon R, Gijs MAM. Dynamic electrochemical quantitation of dopamine release from a cells-on-paper system. RSC Adv 2016. [DOI: 10.1039/c6ra02487d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
A simple hybrid microfluidic/electrochemical system is used to observe the secretion of neurotransmitters from a cells-on-paper system.
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Affiliation(s)
- Raphaël Trouillon
- Laboratory of Microsystems
- Ecole Polytechnique Fédérale de Lausanne
- CH-1015 Lausanne
- Switzerland
| | - Martin A. M. Gijs
- Laboratory of Microsystems
- Ecole Polytechnique Fédérale de Lausanne
- CH-1015 Lausanne
- Switzerland
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48
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Li C, Narayan RK, Wu PM, Rajan N, Wu Z, Mehan N, Golanov EV, Ahn CH, Hartings JA. Evaluation of microelectrode materials for direct-current electrocorticography. J Neural Eng 2015; 13:016008. [DOI: 10.1088/1741-2560/13/1/016008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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49
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Ayata C, Lauritzen M. Spreading Depression, Spreading Depolarizations, and the Cerebral Vasculature. Physiol Rev 2015; 95:953-93. [PMID: 26133935 DOI: 10.1152/physrev.00027.2014] [Citation(s) in RCA: 364] [Impact Index Per Article: 40.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Spreading depression (SD) is a transient wave of near-complete neuronal and glial depolarization associated with massive transmembrane ionic and water shifts. It is evolutionarily conserved in the central nervous systems of a wide variety of species from locust to human. The depolarization spreads slowly at a rate of only millimeters per minute by way of grey matter contiguity, irrespective of functional or vascular divisions, and lasts up to a minute in otherwise normal tissue. As such, SD is a radically different breed of electrophysiological activity compared with everyday neural activity, such as action potentials and synaptic transmission. Seventy years after its discovery by Leão, the mechanisms of SD and its profound metabolic and hemodynamic effects are still debated. What we did learn of consequence, however, is that SD plays a central role in the pathophysiology of a number of diseases including migraine, ischemic stroke, intracranial hemorrhage, and traumatic brain injury. An intriguing overlap among them is that they are all neurovascular disorders. Therefore, the interplay between neurons and vascular elements is critical for our understanding of the impact of this homeostatic breakdown in patients. The challenges of translating experimental data into human pathophysiology notwithstanding, this review provides a detailed account of bidirectional interactions between brain parenchyma and the cerebral vasculature during SD and puts this in the context of neurovascular diseases.
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Affiliation(s)
- Cenk Ayata
- Neurovascular Research Laboratory, Department of Radiology, and Stroke Service and Neuroscience Intensive Care Unit, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts; Department of Neuroscience and Pharmacology and Center for Healthy Aging, University of Copenhagen, Copenhagen, Denmark; and Department of Clinical Neurophysiology, Glostrup Hospital, Glostrup, Denmark
| | - Martin Lauritzen
- Neurovascular Research Laboratory, Department of Radiology, and Stroke Service and Neuroscience Intensive Care Unit, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts; Department of Neuroscience and Pharmacology and Center for Healthy Aging, University of Copenhagen, Copenhagen, Denmark; and Department of Clinical Neurophysiology, Glostrup Hospital, Glostrup, Denmark
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50
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Seidel JL, Escartin C, Ayata C, Bonvento G, Shuttleworth CW. Multifaceted roles for astrocytes in spreading depolarization: A target for limiting spreading depolarization in acute brain injury? Glia 2015; 64:5-20. [PMID: 26301517 DOI: 10.1002/glia.22824] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 01/31/2015] [Accepted: 03/02/2015] [Indexed: 12/17/2022]
Abstract
Spreading depolarizations (SDs) are coordinated waves of synchronous depolarization, involving large numbers of neurons and astrocytes as they spread slowly through brain tissue. The recent identification of SDs as likely contributors to pathophysiology in human subjects has led to a significant increase in interest in SD mechanisms, and possible approaches to limit the numbers of SDs or their deleterious consequences in injured brain. Astrocytes regulate many events associated with SD. SD initiation and propagation is dependent on extracellular accumulation of K(+) and glutamate, both of which involve astrocytic clearance. SDs are extremely metabolically demanding events, and signaling through astrocyte networks is likely central to the dramatic increase in regional blood flow that accompanies SD in otherwise healthy tissues. Astrocytes may provide metabolic support to neurons following SD, and may provide a source of adenosine that inhibits neuronal activity following SD. It is also possible that astrocytes contribute to the pathophysiology of SD, as a consequence of excessive glutamate release, facilitation of NMDA receptor activation, brain edema due to astrocyte swelling, or disrupted coupling to appropriate vascular responses after SD. Direct or indirect evidence has accumulated implicating astrocytes in many of these responses, but much remains unknown about their specific contributions, especially in the context of injury. Conversion of astrocytes to a reactive phenotype is a prominent feature of injured brain, and recent work suggests that the different functional properties of reactive astrocytes could be targeted to limit SDs in pathophysiological conditions.
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Affiliation(s)
- Jessica L Seidel
- Stroke and Neurovascular Regulation Lab, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts
| | - Carole Escartin
- Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), Département des Sciences du Vivant (DSV), Institut d'Imagerie Biomédicale (I2BM), Molecular Imaging Center (MIRCen), CNRS UMR 9199, Université Paris-Sud, Université Paris-Saclay, F-92260 Fontenay-aux-Roses, France
| | - Cenk Ayata
- Stroke and Neurovascular Regulation Lab, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts.,Stroke Service and Neuroscience Intensive Care Unit, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts
| | - Gilles Bonvento
- Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), Département des Sciences du Vivant (DSV), Institut d'Imagerie Biomédicale (I2BM), Molecular Imaging Center (MIRCen), CNRS UMR 9199, Université Paris-Sud, Université Paris-Saclay, F-92260 Fontenay-aux-Roses, France
| | - C William Shuttleworth
- Department of Neurosciences, University of New Mexico School of Medicine, Albuquerque, New Mexico
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