1
|
Deumer J, Schürmann R, Gaál A, Varga Z, Bettin B, van der Pol E, Nieuwland R, Ojeda D, Sikora A, Bartczak D, Goenaga-Infante H, Noireaux J, Khakpour M, Korpelainen V, Gollwitzer C. Traceable characterization of hollow organosilica beads as potential reference materials for extracellular vesicle measurements with optical techniques. Discov Nano 2024; 19:14. [PMID: 38252361 PMCID: PMC10810315 DOI: 10.1186/s11671-024-03956-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Accepted: 01/10/2024] [Indexed: 01/23/2024]
Abstract
The concentration of cell-type specific extracellular vesicles (EVs) is a promising biomarker for various diseases. However, concentrations of EVs measured by optical techniques such as flow cytometry (FCM) or particle tracking analysis (PTA) in clinical practice are incomparable. To allow reliable and comparable concentration measurements suitable reference materials (RMs) and SI-traceable (SI-International system of units) methods are required. Hollow organosilica beads (HOBs) are promising RM candidates for concentration measurements of EVs based on light scattering, as the shape, low refractive index, and number concentration of HOBs are comparable to EVs of the respective size range that can be detected with current optical instrumentation. Here, we present traceable methods for measuring the particle size distribution of four HOB types in the size range between 200 and 500 nm by small-angle X-ray scattering (SAXS) and atomic force microscopy (AFM), as well as the number concentration by single-particle inductively coupled plasma mass spectrometry (spICP-MS). Based on the size and shape results, traceable reference values were obtained to additionally determine the refractive index of the shell of the HOB samples by FCM. Furthermore, the estimated refractive indexes of the HOBs plausibly agree with the refractive indexes of EVs of corresponding size. Due to their narrow size distribution and their similar shape, and low refractive index, all HOB samples studied are suitable RM candidates for calibration of the measured sample volume by optical methods within the photon wavelength range used, and thus for calibration of number concentration measurements of EVs in the size range indicated. This was confirmed as the number concentration values obtained by PTA and two independent flow cytometric measurements agreed with the concentration reference values obtained by two independent spICP-MS measurements within the calculated uncertainty limits.
Collapse
Grants
- 18HLT01 METVES II project, which received funding from the EMPIR program, co-funded by the participating states, and from the European Union's Horizon 2020 research and innovation program
- KP2021-EGA-31 János Bolyai Research Fellowship of the Hungarian Academy of Sciences and the funding from the National Research, Development and Innovation Office, Hungary (NKFIH)
- 2020-1.1.2-PIACI-KFI-2020-00021 János Bolyai Research Fellowship of the Hungarian Academy of Sciences and the funding from the National Research, Development and Innovation Office, Hungary (NKFIH)
- VIDI 19724 Dutch Research Council (NWO)
- METVES II project, which received funding from the EMPIR program, co-funded by the participating states, and from the European Union’s Horizon 2020 research and innovation program
- Physikalisch-Technische Bundesanstalt (PTB) (4254)
Collapse
Affiliation(s)
- Jérôme Deumer
- Physikalisch-Technische Bundesanstalt, Abbestr. 2-12, 10587, Berlin, Germany.
| | - Robin Schürmann
- Physikalisch-Technische Bundesanstalt, Abbestr. 2-12, 10587, Berlin, Germany
| | - Anikó Gaál
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, Budapest, 1117, Hungary
| | - Zoltán Varga
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, Budapest, 1117, Hungary
- Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, Műegyetem rkp. 3, Budapest, 1111, Hungary
| | - Britta Bettin
- Laboratory of Experimental Clinical Chemistry, Amsterdam UMC Location University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
- Biomedical Engineering and Physics, Amsterdam UMC location University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
- Amsterdam Vesicle Center, Amsterdam UMC location University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
| | - Edwin van der Pol
- Laboratory of Experimental Clinical Chemistry, Amsterdam UMC Location University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
- Biomedical Engineering and Physics, Amsterdam UMC location University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
- Amsterdam Vesicle Center, Amsterdam UMC location University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
| | - Rienk Nieuwland
- Laboratory of Experimental Clinical Chemistry, Amsterdam UMC Location University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
- Biomedical Engineering and Physics, Amsterdam UMC location University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
- Amsterdam Vesicle Center, Amsterdam UMC location University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
| | - David Ojeda
- National Measurement Laboratory, LGC Limited, Teddington, TW11 0LY, UK
| | - Aneta Sikora
- National Measurement Laboratory, LGC Limited, Teddington, TW11 0LY, UK
| | - Dorota Bartczak
- National Measurement Laboratory, LGC Limited, Teddington, TW11 0LY, UK
| | | | - Johanna Noireaux
- Department of Climate Change and Environment, Laboratoire National de Métrologie et d'Essais, 1, Rue Gaston Boissier, 75724, Paris, France
| | - Mahrad Khakpour
- National Metrology Institute, VTT MIKES, Tekniikantie 1, FI-02150 , Espoo, Finland
| | - Virpi Korpelainen
- National Metrology Institute, VTT MIKES, Tekniikantie 1, FI-02150 , Espoo, Finland
| | | |
Collapse
|
2
|
Bolea E, Jimenez MS, Perez-Arantegui J, Vidal JC, Bakir M, Ben-Jeddou K, Gimenez-Ingalaturre AC, Ojeda D, Trujillo C, Laborda F. Analytical applications of single particle inductively coupled plasma mass spectrometry: a comprehensive and critical review. Anal Methods 2021; 13:2742-2795. [PMID: 34159952 DOI: 10.1039/d1ay00761k] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Single particle inductively coupled plasma mass spectrometry (SP-ICP-MS) refers to the use of ICP-MS as a particle counting technique. When ICP-MS measurements are performed at very high data acquisition frequencies, information about (nano)particles containing specific elements and their dissolved forms can be obtained (element mass per particle, size and number and mass concentrations). As a result of its outstanding performance, SP-ICP-MS has become a relevant technique for the analysis of complex samples containing inorganic nanoparticles. This review discusses the maturity level achieved by the technique through the methods developed for the detection, characterisation and quantification of engineered and natural (nano)particles. The application of these methods in different analytical scenarios is comprehensively reviewed and critically discussed, with special attention to their current technical and metrological limitations. The emergent applications of SP-ICP-MS in the field of nanoparticle-tagged immunoassay and hybridization methods are also reviewed.
Collapse
Affiliation(s)
- Eduardo Bolea
- Group of Analytical Spectroscopy and Sensors (GEAS), Institute of Environmental Sciences (IUCA), University of Zaragoza, Pedro Cerbuna 12, Zaragoza, 50009, Spain.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
3
|
Ojeda D, Sánchez P, Bolea E, Laborda F, Castillo JR. How the use of a short channel can improve the separation efficiency of nanoparticles in asymmetrical flow field-flow fractionation. J Chromatogr A 2020; 1635:461759. [PMID: 33278672 DOI: 10.1016/j.chroma.2020.461759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 11/19/2020] [Accepted: 11/23/2020] [Indexed: 11/16/2022]
Abstract
The use of a commercially available short length channel (14 cm length) is proposed to improve the efficiency associated to the separation by asymmetrical flow field-flow fractionation of particles in the nanometer range respect to a standard channel (27 cm length). The effect of channel length on elution times, separation efficiency and resolution have been studied. Polystyrene particles between 50 and 500 nm in size have been used to compare the behavior of both channels. Theoretical aspects based on the different contributions on particle diffusion inside the channel during the separation process have been considered to justify the results obtained. Non-equilibrium diffusion contribution to the efficiency has shown to be the most relevant aspect to be controlled during the separation. The increment of the field strength applied through the cross-flow velocityallows the reduction of diffusion while keep elution times constant. The use of the same cross-flow in a channel with a smaller area is the key factor that justifies the better efficiencies observed along the whole size range studied (improvements that reach factors up to 4.7 in experimental efficiency respect to the standard channel were achieved). The separation of polystyrene particles of 100 and 200 nm was achieved with a resolution of 1.20, whereas a 0.66 value was obtained with the standard channel at the same elution times. Channel recoveries have been also compared under optimized conditions to ensure that no side effects are produced, including the separation of mixtures of TiO2 nanoparticles. Similar or even better values were obtained with the short length channel, with recoveries higher than 85% for all the polystyrene particles tested and 75% recovery for the TiO2 nanoparticle mixture, which justifies its use for the separation of nanoparticles, providing better resolutions without compromise elution times or recoveries.
Collapse
Affiliation(s)
- David Ojeda
- Group of Analytical Spectroscopy and Sensors (GEAS), Institute of Environmental Sciences (IUCA), University of Zaragoza, Pedro Cerbuna, 12., 50009, Zaragoza, Spain
| | - Pablo Sánchez
- Group of Analytical Spectroscopy and Sensors (GEAS), Institute of Environmental Sciences (IUCA), University of Zaragoza, Pedro Cerbuna, 12., 50009, Zaragoza, Spain
| | - Eduardo Bolea
- Group of Analytical Spectroscopy and Sensors (GEAS), Institute of Environmental Sciences (IUCA), University of Zaragoza, Pedro Cerbuna, 12., 50009, Zaragoza, Spain.
| | - Francisco Laborda
- Group of Analytical Spectroscopy and Sensors (GEAS), Institute of Environmental Sciences (IUCA), University of Zaragoza, Pedro Cerbuna, 12., 50009, Zaragoza, Spain
| | - Juan R Castillo
- Group of Analytical Spectroscopy and Sensors (GEAS), Institute of Environmental Sciences (IUCA), University of Zaragoza, Pedro Cerbuna, 12., 50009, Zaragoza, Spain
| |
Collapse
|
4
|
Abstract
The Surveillance, Epidemiology, and End Results program from the National Cancer Institute reports that the aggregate number of oral cavity and pharyngeal cancer cases has been increasing over the past decade and, despite an overall decline in oral cavity cancers, this increase is largely related to a dramatic increase in cancers involving oropharyngeal subsites. Early detection of oral cavity cancers is commensurate with improved survival, and opportunistic screening by trained clinicians to detect oral cavity cancer and oral potentially malignant disorders is recommended by the American Dental Association and the American Academy of Oral Medicine.
Collapse
Affiliation(s)
- David Ojeda
- Department of Comprehensive Dentistry, University of Texas Health Science Center San Antonio, School of Dentistry, 7703 Floyd Curl Drive, office 2.565U, San Antonio, TX 78229-3900, USA
| | - Michaell A Huber
- Department of Comprehensive Dentistry, University of Texas Health Science Center San Antonio, School of Dentistry, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, USA
| | - Alexander R Kerr
- Department of Oral & Maxillofacial Pathology, Radiology and Medicine, New York University College of Dentistry, 345 East 24th Street, Room 813C, New York, NY 10010, USA.
| |
Collapse
|
5
|
Ojeda D, Taboada-López MV, Bolea E, Pérez-Arantegui J, Bermejo-Barrera P, Moreda-Piñeiro A, Laborda F. Size characterization and quantification of titanium dioxide nano- and microparticles-based products by Asymmetrical Flow Field-Flow Fractionation coupled to Dynamic Light Scattering and Inductively Coupled Plasma Mass Spectrometry. Anal Chim Acta 2020; 1122:20-30. [DOI: 10.1016/j.aca.2020.04.080] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 04/28/2020] [Accepted: 04/30/2020] [Indexed: 10/24/2022]
|
6
|
Villa A, Celentano A, Glurich I, Borgnakke WS, Jensen SB, Peterson DE, Delli K, Ojeda D, Vissink A, Farah CS. World Workshop on Oral Medicine VII: Prognostic biomarkers in oral leukoplakia: A systematic review of longitudinal studies. Oral Dis 2020; 25 Suppl 1:64-78. [PMID: 31140698 DOI: 10.1111/odi.13087] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 02/24/2019] [Accepted: 03/03/2019] [Indexed: 01/02/2023]
Abstract
OBJECTIVE To identify the prognostic biomarker candidates for stratification and long-term surveillance of oral leukoplakia progressing to cancer via a systematic literature review. MATERIALS AND METHODS Systematic searches with no date restrictions were conducted on March 29, 2018, targeting the databases PubMed (Ovid), EMBASE (Ovid), EBM (Ovid), and Web of Science (ISI). Bias was assessed using the Quality in Prognosis Studies tool. Biomarkers were stratified based on hallmarks of cancer. RESULTS Inclusion criteria were met by 25 of 3,415 studies. A range of biomarkers were evaluated experimentally for risk stratification, prognosis, and surveillance of oral leukoplakia in tissue, blood, and saliva. However, the studies were highly heterogeneous and require further validation. Biomarkers reported in these studies included inflammatory or oxidative markers, growth factors, ion channels, genetic and cellular regulatory factors, and epigenetic biomarkers. Studies tended to include small sample sizes, under-reported or variably reported histopathological data, did not address potential confounding, reported limited/variable follow-up data, or lacked a control group. Inclusion of subsets from chemoprevention trials may have introduced bias regarding reported malignant transformation rates and accuracy of prognostic biomarkers. CONCLUSIONS This review identified insufficient longitudinal evidence to support validated prognostic biomarkers for oral leukoplakia. Further studies are needed to identify molecular targets with the potential to mitigate risk of malignant transformation.
Collapse
Affiliation(s)
- Alessandro Villa
- Division of Oral Medicine and Dentistry, Brigham and Women's Hospital, Boston, Massachusetts.,Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, Massachusetts
| | - Antonio Celentano
- Melbourne Dental School, The University of Melbourne, Melbourne, Victoria, Australia
| | - Ingrid Glurich
- Center for Oral and Systemic Health, Marshfield Clinic Research Institute, Marshfield, Wisconsin
| | - Wenche S Borgnakke
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, Michigan
| | - Siri Beier Jensen
- Department of Dentistry and Oral Health, Faculty of Health, Aarhus University, Aarhus, Denmark
| | - Douglas E Peterson
- Oral Medicine Section, Department of Oral Health and Diagnostic Sciences, School of Dental Medicine, UConn Health, Farmington, Connecticut
| | - Konstantina Delli
- Department of Oral and Maxillofacial Surgery, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - David Ojeda
- Department of Comprehensive Dentistry, School of Dentistry, UT Health San Antonio, San Antonio, Texas
| | - Arjan Vissink
- Department of Oral and Maxillofacial Surgery, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Camile S Farah
- Australian Centre for Oral Oncology Research & Education, Perth, Westren Australia, Australia
| |
Collapse
|
7
|
Delli K, Villa A, Farah CS, Celentano A, Ojeda D, Peterson DE, Jensen SB, Glurich I, Vissink A. World Workshop on Oral Medicine VII: Biomarkers predicting lymphoma in the salivary glands of patients with Sjögren's syndrome-A systematic review. Oral Dis 2020; 25 Suppl 1:49-63. [PMID: 30663837 DOI: 10.1111/odi.13041] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 01/12/2019] [Accepted: 01/14/2019] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To conduct a systematic review of studies exploring potential biomarkers for development, course, and efficacy of treatment of lymphomas in salivary glands of patients with Sjögren's syndrome. MATERIAL AND METHODS Eligible studies were identified through a comprehensive search of two databases, that is, PubMed and EMBASE. Quality of included articles was assessed with the "Quality In Prognosis Studies" (QUIPS) tool. The "CHecklist for critical Appraisal and data extraction for systematic Reviews of prediction Modelling Studies" (CHARMS) was used to facilitate data extraction. RESULTS Fifty-eight studies met the inclusion criteria. Only one study assessed the progression of lymphoma. Moderate risk of bias was detected in "outcome measurement," "study participation," and "study confounding" domains. Parotid gland enlargement, mixed monoclonal cryoglobulins, and low C4 levels represented strongest predictors of lymphoma development. The role of histological biomarkers, and specifically germinal centers, remains controversial. Clinical and methodological heterogeneity across studies precluded conduct of a meta-analysis. CONCLUSIONS Specific biomarkers in combination with clinical manifestations represent potential candidates for advancing precision medicine approaches to lymphoma prediction in patients with Sjögren's syndrome. Current focus has increasingly been on genetic and epigenetic markers as candidate predictors. Predictive accuracy of key biomarker candidates remains to be tested in well-designed prospectively followed Sjögren's syndrome cohorts.
Collapse
Affiliation(s)
- Konstantina Delli
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Alessandro Villa
- Division of Oral Medicine and Dentistry, Brigham and Women's Hospital, Boston, Massachusetts, USA.,Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, Massachusetts, USA
| | - Camile S Farah
- UWA Dental School, University of Western Australia, Perth, Western Australia, Australia
| | - Antonio Celentano
- Melbourne Dental School, The University of Melbourne, Melbourne, Victoria, Australia
| | - David Ojeda
- Department of Comprehensive Dentistry, School of Dentistry, UT Health San Antonio, San Antonio, Texas, USA
| | - Douglas E Peterson
- Oral Medicine, Department of Oral Health and Diagnostic Sciences, School of Dental Medicine, UConn Health, Farmington, Connecticut, USA
| | - Siri B Jensen
- Department of Dentistry and Oral Health, Faculty of Health, Aarhus University, Aarhus, Denmark
| | - Ingrid Glurich
- Center for Oral and Systemic Medicine, Marshfield Clinic Research Institute, Marshfield, Wisconsin, USA
| | - Arjan Vissink
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| |
Collapse
|
8
|
Villa A, Celentano A, Glurich I, Borgnakke WS, Jensen SB, Peterson DE, Delli K, Ojeda D, Vissink A, Farah CS. Response to "prognostic biomarkers in oral leukoplakia". Oral Dis 2019; 25:2048-2049. [PMID: 31469945 DOI: 10.1111/odi.13185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 08/25/2019] [Indexed: 11/27/2022]
Affiliation(s)
- Alessandro Villa
- Division of Oral Medicine and Dentistry, Brigham and Women's Hospital, Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA
| | - Antonio Celentano
- Melbourne Dental School, The University of Melbourne, Melbourne, Vic., Australia
| | - Ingrid Glurich
- Center for Oral and Systemic Health, Marshfield Clinic Research Institute, Marshfield, WI, USA
| | - Wenche S Borgnakke
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - Siri Beier Jensen
- Department of Dentistry and Oral Health, Faculty of Health, Aarhus University, Aarhus, Denmark
| | - Douglas E Peterson
- Oral Medicine Section, Department of Oral Health and Diagnostic Sciences, School of Dental Medicine, UConn Health, Farmington, CT, USA
| | - Konstantina Delli
- Department of Oral and Maxillofacial Surgery, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - David Ojeda
- Department of Comprehensive Dentistry, School of Dentistry, UT Health San Antonio, San Antonio, TX, USA
| | - Arjan Vissink
- Department of Oral and Maxillofacial Surgery, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Camile S Farah
- Australian Center for Oral Oncology Research & Education, Perth, WA, Australia
| |
Collapse
|
9
|
Bussalb A, Collin S, Barthélemy Q, Ojeda D, Bioulac S, Blasco-Fontecilla H, Brandeis D, Purper Ouakil D, Ros T, Mayaud L. Is there a cluster of high theta-beta ratio patients in attention deficit hyperactivity disorder? Clin Neurophysiol 2019; 130:1387-1396. [PMID: 31176621 DOI: 10.1016/j.clinph.2019.02.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 02/15/2019] [Accepted: 02/27/2019] [Indexed: 11/16/2022]
Affiliation(s)
- Aurore Bussalb
- Mensia Technologies SA, 130 rue de Lourmel, 75015 Paris, France; Assistance Publique-Hôpitaux de Paris, Robert Debré Hospital, Child and Adolescent Psychiatry, Paris, France.
| | - Sidney Collin
- Mensia Technologies SA, 130 rue de Lourmel, 75015 Paris, France
| | | | - David Ojeda
- Mensia Technologies SA, 130 rue de Lourmel, 75015 Paris, France
| | - Stephanie Bioulac
- Université de Bordeaux, Sommeil, Addiction et Neuropsychiatrie, USR 3413, F-33000 Bordeaux, France; CNRS, SANPSY, USR 3413, F-33000 Bordeaux, France; CHU Pellegrin, Clinique du Sommeil, F-33076 Bordeaux, France
| | - Hilario Blasco-Fontecilla
- Department of Psychiatry, Puerta de Hierro University Hospital-IDIPHIPSA, Autonoma University of Madrid, CIBERSAM, Madrid, Spain
| | - Daniel Brandeis
- Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim/Heidelberg University, Mannheim, Germany; Department of Child and Adolescent Psychiatry and Psychotherapy, Psychiatric Hospital, University of Zurich, Zurich, Switzerland; Neuroscience Center Zurich, University of Zurich and ETH Zurich, Zurich, Switzerland; Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - Diane Purper Ouakil
- CHU Montpellier-Saint Eloi Hospital, University of Montpellier, Unit of Child and Adolescent Psychiatry (MPEA1), Montpellier, France
| | - Tomas Ros
- Department of Neuroscience, Geneva, Switzerland
| | - Louis Mayaud
- Mensia Technologies SA, 130 rue de Lourmel, 75015 Paris, France
| |
Collapse
|
10
|
Barthelemy Q, Mayaud L, Ojeda D, Congedo M. The Riemannian Potato Field: A Tool for Online Signal Quality Index of EEG. IEEE Trans Neural Syst Rehabil Eng 2019; 27:244-255. [PMID: 30668501 DOI: 10.1109/tnsre.2019.2893113] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Electroencephalographic (EEG) recordings are contaminated by instrumental, environmental, and biological artifacts, resulting in low signal-to-noise ratio. Artifact detection is a critical task for real-time applications where the signal is used to give a continuous feedback to the user. In these applications, it is therefore necessary to estimate online a signal quality index (SQI) in order to stop the feedback when the signal quality is unacceptable. In this paper, we introduce the Riemannian potato field (RPF) algorithm as such SQI. It is a generalization and extensionof theRiemannian potato, a previouslypublished real-time artifact detection algorithm, whose performance is degraded as the number of channels increases. The RPF overcomes this limitation by combining the outputs of several smaller potatoes into a unique SQI resulting in a higher sensitivity and specificity, regardless of the number of electrodes. We demonstrate these results on a clinical dataset totalizing more than 2200 h of EEG recorded at home, that is, in a non-controlled environment.
Collapse
|
11
|
Bussalb A, Congedo M, Barthélemy Q, Ojeda D, Acquaviva E, Delorme R, Mayaud L. Clinical and Experimental Factors Influencing the Efficacy of Neurofeedback in ADHD: A Meta-Analysis. Front Psychiatry 2019; 10:35. [PMID: 30833909 PMCID: PMC6388544 DOI: 10.3389/fpsyt.2019.00035] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 01/21/2019] [Indexed: 11/13/2022] Open
Abstract
Meta-analyses have been extensively used to evaluate the efficacy of neurofeedback (NFB) treatment for Attention Deficit/Hyperactivity Disorder (ADHD) in children and adolescents. However, each meta-analysis published in the past decade has contradicted the methods and results from the previous one, thus making it difficult to determine a consensus of opinion on the effectiveness of NFB. This works brings continuity to the field by extending and discussing the last and much controversial meta-analysis by Cortese et al. (1). The extension comprises an update of that work including the latest control trials, which have since been published and, most importantly, offers a novel methodology. Specifically, NFB literature is characterized by a high technical and methodological heterogeneity, which partly explains the current lack of consensus on the efficacy of NFB. This work takes advantage of this by performing a Systematic Analysis of Biases (SAOB) in studies included in the previous meta-analysis. Our extended meta-analysis (k = 16 studies) confirmed the previously obtained results of effect sizes in favor of NFB efficacy as being significant when clinical scales of ADHD are rated by parents (non-blind, p-value = 0.0014), but not when they are rated by teachers (probably blind, p-value = 0.27). The effect size is significant according to both raters for the subset of studies meeting the definition of "standard NFB protocols" (parents' p-value = 0.0054; teachers' p-value = 0.043, k = 4). Following this, the SAOB performed on k = 33 trials identified three main factors that have an impact on NFB efficacy: first, a more intensive treatment, but not treatment duration, is associated with higher efficacy; second, teachers report a lower improvement compared to parents; third, using high-quality EEG equipment improves the effectiveness of the NFB treatment. The identification of biases relating to an appropriate technical implementation of NFB certainly supports the efficacy of NFB as an intervention. The data presented also suggest that the probably blind assessment of teachers may not be considered a good proxy for blind assessments, therefore stressing the need for studies with placebo-controlled intervention as well as carefully reported neuromarker changes in relation to clinical response.
Collapse
Affiliation(s)
- Aurore Bussalb
- Mensia Technologies SA, Paris, France.,Child and Adolescent Psychiatry Department, Robert Debré Hospital, Paris, France
| | - Marco Congedo
- GIPSA-Lab, Université Grenoble Alpes, CNRS, Grenoble-INP, Grenoble, France
| | | | | | - Eric Acquaviva
- Child and Adolescent Psychiatry Department, Robert Debré Hospital, Paris, France
| | - Richard Delorme
- Child and Adolescent Psychiatry Department, Robert Debré Hospital, Paris, France
| | | |
Collapse
|
12
|
Villa A, Menon RS, Kerr AR, De Abreu Alves F, Guollo A, Ojeda D, Woo SB. Proliferative leukoplakia: Proposed new clinical diagnostic criteria. Oral Dis 2018; 24:749-760. [PMID: 29337414 DOI: 10.1111/odi.12830] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 12/13/2017] [Accepted: 01/07/2018] [Indexed: 11/29/2022]
Abstract
OBJECTIVE We aimed to characterize proliferative verrucous leukoplakia (PVL) from a clinical and histopathological standpoint and suggest an updated classification. SUBJECTS AND METHODS Records of patients seen at three oral medicine centers with a clinical diagnosis of PVL were reviewed for clinical and histopathological features and malignant transformation (MT). RESULTS There were 42 patients (median age: 69 years [range: 36-88]; 35 females). 12.2% were current smokers. Family history of cancer was present in 43.7% of patients. Partial demarcation of lesion margins was present in 31.3% of lesions, followed by verrucous (27.5%), smooth (22.7%) erythematous (22.3%), and fissured (18.3%) appearance. Large and contiguous and multisite and non-contiguous lesions comprised 57.1% (24/42) and 35.7% (15/42) of PVL cases, respectively. 19.1% had prominent erythema (erythroleukoplakia). The most common histopathological diagnosis at first visit was hyperkeratosis without dysplasia (22/42; 56.4%). MT occurred in 71.4% patients after a median of 37 months [range: 1-210] from initial visit; erythroleukoplakia exhibited MT in 100% of cases. CONCLUSION The generic term "proliferative leukoplakia (PL)" may be more appropriate than PVL because 18.3% were fissured and 22.7% erythematous. We also propose the term proliferative erythroleukoplakia to more accurately describe the subset of PL with prominent erythema, which had the highest MT rate.
Collapse
Affiliation(s)
- A Villa
- Division of Oral Medicine and Dentistry, Brigham and Women's Hospital and Dana Farber Cancer Institute, Boston, MA, USA.,Department of Oral Medicine Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA
| | - R S Menon
- Department of Oral Medicine Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA
| | - A R Kerr
- Department of Oral & Maxillofacial Pathology, Radiology and Medicine, New York University College of Dentistry, New York, NY, USA
| | - F De Abreu Alves
- Stomatology Department at AC Camargo Cancer Center, Sao Paulo, Brazil
| | - A Guollo
- Stomatology Department at AC Camargo Cancer Center, Sao Paulo, Brazil
| | - D Ojeda
- Department of Comprehensive Dentistry, School of Dentistry, UT Health San Antonio, San Antonio, TX, USA
| | - S B Woo
- Division of Oral Medicine and Dentistry, Brigham and Women's Hospital and Dana Farber Cancer Institute, Boston, MA, USA.,Department of Oral Medicine Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA
| |
Collapse
|
13
|
Affiliation(s)
- Eric T Stoopler
- Department of Oral Medicine, University of Pennsylvania School of Dental Medicine, Philadelphia
| | - David Ojeda
- Department of Oral Medicine, University of Pennsylvania School of Dental Medicine, Philadelphia
| | - Faizan Alawi
- Section of Oral and Maxillofacial Pathology, Division of Dermatopathology, Department of Dermatology, University of Pennsylvania Health System, Philadelphia
| |
Collapse
|
14
|
Ojeda D, Le Rolle V, Romero-Ugalde HM, Gallet C, Bonnet JL, Henry C, Bel A, Mabo P, Carrault G, Hernández AI. Sensitivity Analysis of Vagus Nerve Stimulation Parameters on Acute Cardiac Autonomic Responses: Chronotropic, Inotropic and Dromotropic Effects. PLoS One 2016; 11:e0163734. [PMID: 27690312 PMCID: PMC5045213 DOI: 10.1371/journal.pone.0163734] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Accepted: 09/13/2016] [Indexed: 11/18/2022] Open
Abstract
Although the therapeutic effects of Vagus Nerve Stimulation (VNS) have been recognized in pre-clinical and pilot clinical studies, the effect of different stimulation configurations on the cardiovascular response is still an open question, especially in the case of VNS delivered synchronously with cardiac activity. In this paper, we propose a formal mathematical methodology to analyze the acute cardiac response to different VNS configurations, jointly considering the chronotropic, dromotropic and inotropic cardiac effects. A latin hypercube sampling method was chosen to design a uniform experimental plan, composed of 75 different VNS configurations, with different values for the main parameters (current amplitude, number of delivered pulses, pulse width, interpulse period and the delay between the detected cardiac event and VNS onset). These VNS configurations were applied to 6 healthy, anesthetized sheep, while acquiring the associated cardiovascular response. Unobserved VNS configurations were estimated using a Gaussian process regression (GPR) model. In order to quantitatively analyze the effect of each parameter and their combinations on the cardiac response, the Sobol sensitivity method was applied to the obtained GPR model and inter-individual sensitivity markers were estimated using a bootstrap approach. Results highlight the dominant effect of pulse current, pulse width and number of pulses, which explain respectively 49.4%, 19.7% and 6.0% of the mean global cardiovascular variability provoked by VNS. More interestingly, results also quantify the effect of the interactions between VNS parameters. In particular, the interactions between current and pulse width provoke higher cardiac effects than the changes on the number of pulses alone (between 6 and 25% of the variability). Although the sensitivity of individual VNS parameters seems similar for chronotropic, dromotropic and inotropic responses, the interacting effects of VNS parameters provoke significantly different cardiac responses, showing the feasibility of a parameter-based functional selectivity. These results are of primary importance for the optimal, subject-specific definition of VNS parameters for a given therapy and may lead to new closed-loop methods allowing for the optimal adaptation of VNS therapy through time.
Collapse
Affiliation(s)
- David Ojeda
- INSERM, U1099, Rennes, France
- Université de Rennes 1, LTSI, Rennes, France
| | - Virginie Le Rolle
- INSERM, U1099, Rennes, France
- Université de Rennes 1, LTSI, Rennes, France
| | | | - Clément Gallet
- INSERM, U1099, Rennes, France
- Université de Rennes 1, LTSI, Rennes, France
| | | | | | - Alain Bel
- INSERM, UMR970 Paris Cardio-vascular Research Center, Paris, France
- Assistance Publique-Hôpitaux de Paris, Department of Cardiology, Hôpital Européen Georges Pompidou, Paris, France
- Paris Descartes University, PRES Paris Sorbonne, Paris, France
| | - Philippe Mabo
- INSERM, U1099, Rennes, France
- Université de Rennes 1, LTSI, Rennes, France
- CHU Rennes, Department of Cardiology, Rennes, France
- INSERM, CIC-IT 1414, Rennes, France
| | - Guy Carrault
- INSERM, U1099, Rennes, France
- Université de Rennes 1, LTSI, Rennes, France
| | - Alfredo I. Hernández
- INSERM, U1099, Rennes, France
- Université de Rennes 1, LTSI, Rennes, France
- * E-mail:
| |
Collapse
|
15
|
Ugalde HMR, Ojeda D, Le Rolle V, Andreu D, Guiraud D, Bonnet JL, Henry C, Karam N, Hagege A, Mabo P, Carrault G, Hernandez AI. Model-Based Design and Experimental Validation of Control Modules for Neuromodulation Devices. IEEE Trans Biomed Eng 2016; 63:1551-8. [DOI: 10.1109/tbme.2015.2498878] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
16
|
Rousselet L, Le Rolle V, Ojeda D, Guiraud D, Hagége A, Bel A, Bonnet JL, Mabo P, Carrault G, Hernández AI. Influence of Vagus Nerve Stimulation parameters on chronotropism and inotropism in heart failure. Annu Int Conf IEEE Eng Med Biol Soc 2016; 2014:526-9. [PMID: 25570012 DOI: 10.1109/embc.2014.6943644] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Vagus Nerve Stimulation (VNS) has been shown to be useful in heart failure patients, including antiarrhythmic effects, improvement of cardiac function and reduction of the mortality. However, the optimal configuration of VNS can be a difficult task, since there are several adjustable parameters, such as current amplitude (mA), pulse width (ms), burst frequency (Hz), number of pulses and, in the case of cardiac-triggered VNS, the delay (ms) between the R-wave and the beginning of the stimulation. The objective of this paper is to analyse the effect of these parameters, and their interaction, on the chronotropic and inotropic responses to vagal stimulation. 306 VNS sequences were tested on 12 sheep with induced heart failure. Autonomic markers of the chronotropic (changes in RR interval) and inotropic (changes in dP/dtmax) effects were extracted from the observed data. In order to analyse the influence of stimulation parameters on these markers, a sensitivity analysis method was applied. Results illustrate the strong interaction between the delay and the others parameters. The number of pulses, the current and the frequency seem to be particularly influent on chronotropism and inotropism although the effect of the frequency is highly non-linear or it depends on other parameters.
Collapse
|
17
|
Stoopler ET, Ojeda D, Elmuradi S. Re: First bite syndrome after bimaxillary osteotomy: case report: Br J Oral Maxillofac Surg 2015; 53(6): 561 - 563. Br J Oral Maxillofac Surg 2015; 54:841-2. [PMID: 26699820 DOI: 10.1016/j.bjoms.2015.11.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Accepted: 11/17/2015] [Indexed: 11/17/2022]
Affiliation(s)
- Eric T Stoopler
- Department of Oral Medicine, University of Pennsylvania School of Dental Medicine, Philadelphia, Pennsylvania.
| | - David Ojeda
- Department of Oral Medicine, University of Pennsylvania School of Dental Medicine, Philadelphia, Pennsylvania
| | - Sophia Elmuradi
- Department of Oral Medicine, University of Pennsylvania School of Dental Medicine, Philadelphia, Pennsylvania
| |
Collapse
|
18
|
Affiliation(s)
- Sophia Elmuradi
- Department of Oral Medicine, University of Pennsylvania School of Dental Medicine, Philadelphia PA
| | - David Ojeda
- Department of Oral Medicine, University of Pennsylvania School of Dental Medicine, Philadelphia PA
| | - Eric T Stoopler
- Department of Oral Medicine, University of Pennsylvania School of Dental Medicine, Philadelphia PA
| |
Collapse
|
19
|
Elmuradi S, Ojeda D, Stoopler ET. Pemphigus vulgaire oral pendant la grossesse. Journal of Obstetrics and Gynaecology Canada 2015. [DOI: 10.1016/s1701-2163(16)30055-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
20
|
Affiliation(s)
- Eric T Stoopler
- Department of Oral Medicine, University of Pennsylvania School of Dental Medicine, Philadelphia, Pennsylvania
| | - David Ojeda
- Department of Oral Medicine, University of Pennsylvania School of Dental Medicine, Philadelphia, Pennsylvania
| | - Sophia Elmuradi
- Department of Oral Medicine, University of Pennsylvania School of Dental Medicine, Philadelphia, Pennsylvania
| | - Thomas P Sollecito
- Department of Oral Medicine, University of Pennsylvania School of Dental Medicine, Philadelphia, Pennsylvania
| |
Collapse
|
21
|
Le Rolle V, Ojeda D, Beuchée A, Praud JP, Pladys P, Hernández AI. A model-based approach for the evaluation of vagal and sympathetic activities in a newborn lamb. Annu Int Conf IEEE Eng Med Biol Soc 2015; 2013:3881-4. [PMID: 24110579 DOI: 10.1109/embc.2013.6610392] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
This paper proposes a baroreflex model and a recursive identification method to estimate the time-varying vagal and sympathetic contributions to heart rate variability during autonomic maneuvers. The baroreflex model includes baroreceptors, cardiovascular control center, parasympathetic and sympathetic pathways. The gains of the global afferent sympathetic and vagal pathways are identified recursively. The method has been validated on data from newborn lambs, which have been acquired during the application of an autonomic maneuver, without medication and under beta-blockers. Results show a close match between experimental and simulated signals under both conditions. The vagal and sympathetic contributions have been simulated and, as expected, it is possible to observe different baroreflex responses under beta-blockers compared to baseline conditions.
Collapse
|
22
|
Ojeda D, Le Rolle V, Harmouche M, Drochon A, Corbineau H, Verhoye JP, Hernández AI. Sensitivity analysis and parameter estimation of a coronary circulation model for triple-vessel disease. IEEE Trans Biomed Eng 2014; 61:1208-19. [PMID: 24658245 DOI: 10.1109/tbme.2013.2296971] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Mathematical models of the coronary circulation have been shown to provide useful information for the analysis of intracoronary blood flow and pressure measurements acquired during coronary artery bypass graft (CABG) surgery. Although some efforts towards the patient-specific estimation of model parameters have been presented in this context, they are based on simplifying hypotheses about the collateral circulation and do not take advantage of the whole set of data acquired during CABG. In order to overcome these limitations, this paper presents an exhaustive parameter sensitivity analysis and a multiobjective patient-specific parameter estimation method, applied to a model of the coronary circulation of patients with triple vessel disease. The results of the sensitivity analysis highlighted the importance of capillary and collateral development. On the other hand, the estimation method was applied to intraoperative clinical data from ten patients obtained during CABG, which permitted to assess patient-specific collateral vessel situations. These approaches provide new insights regarding the heterogeneous configuration of the collateral circulation.
Collapse
|
23
|
Ojeda D, Le Rolle V, Drochon A, Harmouche M, Corbineau H, Verhoye JP, Hernández AI. Multiobjective patient-specific estimation of a coronary circulation model for triple vessel disease. Annu Int Conf IEEE Eng Med Biol Soc 2013; 2013:3877-80. [PMID: 24110578 DOI: 10.1109/embc.2013.6610391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Computational models can help understand the hemodynamics of the coronary circulation, which is of the upmost importance to help clinicians before, during and after a coronary artery bypass graft surgery. In this paper, we propose a multiobjective optimization method for parameter estimation of a computational model representing the coronary circulation on patients with a triple vessel disease. This estimation was not based on any assumption regarding the development of the collateral circulation, like in previous works. Indeed, the collateral development of a given patient is estimated through the model parameters. Parameter estimation was performed using clinical data from three patients, obtained before and during an off-pump coronary artery bypass graft surgery (CABG). Results showed a better performance when comparing the simulation with clinical data, since the total error estimation for three patients was reduced by 40 ± 22%. Moreover, the proposed method provides new insight regarding the heterogeneous configuration of the alternative collateral vessels.
Collapse
|
24
|
Sede M, Laufer N, Ojeda D, Gun A, Cahn P, Quarleri J. Analysis of sequences of hepatitis C virus NS5A genotype 1 in HIV-coinfected patients with a null response to nitazoxanide or peg-interferon plus ribavirin. Arch Virol 2013; 158:1907-15. [DOI: 10.1007/s00705-013-1687-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 02/22/2013] [Indexed: 02/06/2023]
|
25
|
Bandini A, Chicot D, Berry P, Decoopman X, Pertuz A, Ojeda D. Indentation size effect of cortical bones submitted to different soft tissue removals. J Mech Behav Biomed Mater 2013; 20:338-46. [DOI: 10.1016/j.jmbbm.2013.02.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 02/14/2013] [Accepted: 02/17/2013] [Indexed: 11/16/2022]
|
26
|
Le Rolle V, Ojeda D, Hernández AI. Embedding a cardiac pulsatile model into an integrated model of the cardiovascular regulation for heart failure followup. IEEE Trans Biomed Eng 2011; 58:2982-6. [PMID: 21690004 DOI: 10.1109/tbme.2011.2159715] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The analysis of followup data from patients suffering from heart failure is a difficult task, due to the complex and multifactorial nature of this pathology. In this paper, we present a coupled model, integrating a pulsatile heart into a model of the short to long-term regulations of the cardiovascular system. An interface method is proposed to couple these models, which present significantly different time scales. Results from a sensitivity analysis of the original and integrated models are proposed with simulations reproducing the main effects of the short- and long-term responses of an acute decompensated heart failure episode on a patient undergoing cardiac resynchronization therapy.
Collapse
|
27
|
Rauch MC, San Martín A, Ojeda D, Quezada C, Salas M, Cárcamo JG, Yañez AJ, Slebe JC, Claude A. Tacrolimus causes a blockage of protein secretion which reinforces its immunosuppressive activity and also explains some of its toxic side-effects. Transpl Immunol 2009; 22:72-81. [PMID: 19628039 DOI: 10.1016/j.trim.2009.07.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2009] [Revised: 07/06/2009] [Accepted: 07/13/2009] [Indexed: 11/29/2022]
Abstract
BACKGROUND Tacrolimus (FK506) is a macrolide immunosuppressant drug from the calcineurin inhibitor family, widely used in solid organ and islet cell transplantation, but produces significant side-effects. OBJECTIVE This study examined the effect of FK506 on interleukin-2 (IL-2) and insulin secretion, establishing a novel characteristic of this drug that could explain its diverse adverse effects, and developed an experimental model for the simultaneous analysis of mRNA expression and protein secretion affected by this drug. METHODS The IL-2 levels when tacrolimus was administered were analysed by Western blot, immunocytochemistry and RT-PCR in a T lymphocyte cellular line (Jurkat) 24 h post-stimulation. The insulin levels when tacrolimus was administered were analysed 4 h after stimulation of glucose-induced insulin secretion in a pancreatic cellular line (MIN6). RESULTS The previously published information describes tacrolimus as only capable of partially blocking IL-2 mRNA expression. In our hands, the cellular content of IL-2 is almost undetectable in stimulated Jurkat cells and can be detected in cellular extracts only when the secretory pathway is blocked by brefeldin A (BFA). BFA added 2 h after the beginning of stimulation was able to inhibit IL-2 secretion, without affecting IL-2 mRNA expression. Therefore BFA utilization allowed us to establish a model to analyze the effect on IL-2 secretion, separately from its expression. Tacrolimus added before stimulation inhibits only IL-2 synthesis, but blocks IL-2 protein secretion when added 2 h after stimulation. Similarly, tacrolimus is also capable of blocking the glucose-stimulated secretion of insulin by MIN6 cells. An increase of the intracellular content can be detected concomitantly with a decrease of the hormone measured in the culture medium. CONCLUSIONS Results of this study indicate that tacrolimus possesses another important effect in addition to the inhibition of IL-2 gene transcription, namely the ability to act as a general inhibitor of the protein secretory pathway. These results strongly suggest that the diabetogenic effect of the immune suppressant FK506 could be caused by the blockade of insulin secretion. This novel effect also provides an explanation for other side-effects observed in immunosuppressive treatment.
Collapse
Affiliation(s)
- M C Rauch
- Instituto de Bioquímica, Universidad Austral de Chile, Chile
| | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Villavicencio G, Schilling A, Sandoval J, Navarrete A, Rubio L, Stuardo C, Pizarro L, Ojeda D, Noguera H, Tapia L. [Validity of rapid biopsy as an intraoperative diagnosis of cancer at the Pathological Anatomy Service of the Hospital Salvador during 1983]. Rev Med Chil 1987; 115:1161-5. [PMID: 3504573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|
29
|
Aguayo J, Ojeda D, Ibáñez C, Pineda G. [Invasive fibrous thyroiditis (Riedel's thyroiditis)]. Rev Med Chil 1983; 111:1263-6. [PMID: 6677970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
|
30
|
Ojeda D, Pineda G, Charlin R, Baeza A, Barriá M, Raventos E. [Multiple endocrine neoplasia type II-B (author's transl)]. Rev Med Chil 1981; 109:339-45. [PMID: 7323520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|