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Boehme S, Herrmann MJ, Mühlberger A. Good moments to stimulate the brain - A randomized controlled double-blinded study on anodal transcranial direct current stimulation of the ventromedial prefrontal cortex on two different time points in a two-day fear conditioning paradigm. Behav Brain Res 2024; 460:114804. [PMID: 38103872 DOI: 10.1016/j.bbr.2023.114804] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 11/30/2023] [Accepted: 12/06/2023] [Indexed: 12/19/2023]
Abstract
It is assumed that extinction learning is a suitable model for understanding the mechanisms underlying exposure therapy. Furthermore, there is evidence that non-invasive brain stimulation (NIBS) can elevate extinction learning by enhancing frontal brain activity and therefore NIBS can augment symptom reduction during exposure therapy in phobias. But, the underlying processes are still not well established. Open questions arise from NIBS time points and electrode placement, among others. Therefore, we investigated in a 2-day fear conditioning experiment, whether anodal transcranial direct current stimulation (tDCS) of the ventromedial prefrontal cortex (vmPFC) modulates either fear memory consolidation or dampened fear reaction during fear extinction. Sixty-six healthy participants were randomly assigned either to a group that received tDCS after fear acquisition (and before fear memory consolidation), to a group that received tDCS directly before fear extinction, or to a control group that never received active stimulation (sham). Differential skin conductance response (SCR) to CS+ vs. CS- was significantly decreased in both tDCS-groups compared to sham group. Our region of interest, the vmPFC, was stimulated best focally with a lateral anode position and a cathode on the contralateral side. But this comes along with a slightly lateral stimulation of vmPFC depending on whether anode is placed left or right. To avoid unintended effects of stimulated sides the two electrode montages (anode left or right) were mirror-inverted which led to differential effects in SCR and electrocortical (mainly late positive potential [LPP]) data in our exploratory analyses. Results indicated that tDCS-timing is relevant for fear reactions via disturbed fear memory consolidation as well as fear expression, and this depends on whether vmPFC is stimulated with either left- or right-sided anode electrode montage. Electrocortical data can shed more light on the underlying neural correlates and exaggerated LPP seems to be associated with disturbed fear memory consolidation and dampened SCR to CS+ vs. CS-, but solely in the right anode electrode montage. Further open questions addressing where and when to stimulate the prefrontal brain in the course of augmenting fear extinction are raised.
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Affiliation(s)
- Stephanie Boehme
- Department of Psychology, Chair for Clinical Psychology and Psychotherapy, Technische Universität Chemnitz, Wilhelm-Raabe-Straße 43, D-09120 Chemnitz, Germany; Department of Psychology, Clinical Psychology and Psychotherapy, University of Regensburg, Universitätsstraße 31, D-93053 Regensburg, Germany.
| | - Martin J Herrmann
- Center of Mental Health, Dept. of Psychiatry, Psychosomatics, and Psychotherapy, University Hospital of Wuerzburg, Margarete-Hoeppel-Platz 1, D-97080 Wuerzburg, Germany
| | - Andreas Mühlberger
- Department of Psychology, Clinical Psychology and Psychotherapy, University of Regensburg, Universitätsstraße 31, D-93053 Regensburg, Germany
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Bas‐Hoogendam JM, Groenewold NA, Aghajani M, Freitag GF, Harrewijn A, Hilbert K, Jahanshad N, Thomopoulos SI, Thompson PM, Veltman DJ, Winkler AM, Lueken U, Pine DS, Wee NJA, Stein DJ, Agosta F, Åhs F, An I, Alberton BAV, Andreescu C, Asami T, Assaf M, Avery SN, Nicholas L, Balderston, Barber JP, Battaglia M, Bayram A, Beesdo‐Baum K, Benedetti F, Berta R, Björkstrand J, Blackford JU, Blair JR, Karina S, Blair, Boehme S, Brambilla P, Burkhouse K, Cano M, Canu E, Cardinale EM, Cardoner N, Clauss JA, Cividini C, Critchley HD, Udo, Dannlowski, Deckert J, Demiralp T, Diefenbach GJ, Domschke K, Doruyter A, Dresler T, Erhardt A, Fallgatter AJ, Fañanás L, Brandee, Feola, Filippi CA, Filippi M, Fonzo GA, Forbes EE, Fox NA, Fredrikson M, Furmark T, Ge T, Gerber AJ, Gosnell SN, Grabe HJ, Grotegerd D, Gur RE, Gur RC, Harmer CJ, Harper J, Heeren A, Hettema J, Hofmann D, Hofmann SG, Jackowski AP, Andreas, Jansen, Kaczkurkin AN, Kingsley E, Kircher T, Kosti c M, Kreifelts B, Krug A, Larsen B, Lee S, Leehr EJ, Leibenluft E, Lochner C, Maggioni E, Makovac E, Mancini M, Manfro GG, Månsson KNT, Meeten F, Michałowski J, Milrod BL, Mühlberger A, Lilianne R, Mujica‐Parodi, Munjiza A, Mwangi B, Myers M, Igor Nenadi C, Neufang S, Nielsen JA, Oh H, Ottaviani C, Pan PM, Pantazatos SP, Martin P, Paulus, Perez‐Edgar K, Peñate W, Perino MT, Peterburs J, Pfleiderer B, Phan KL, Poletti S, Porta‐Casteràs D, Price RB, Pujol J, Andrea, Reinecke, Rivero F, Roelofs K, Rosso I, Saemann P, Salas R, Salum GA, Satterthwaite TD, Schneier F, Schruers KRJ, Schulz SM, Schwarzmeier H, Seeger FR, Smoller JW, Soares JC, Stark R, Stein MB, Straube B, Straube T, Strawn JR, Suarez‐Jimenez B, Boris, Suchan, Sylvester CM, Talati A, Tamburo E, Tükel R, Heuvel OA, Van der Auwera S, Nieuwenhuizen H, Tol M, van Velzen LS, Bort CV, Vermeiren RRJM, Visser RM, Volman I, Wannemüller A, Wendt J, Werwath KE, Westenberg PM, Wiemer J, Katharina, Wittfeld, Wu M, Yang Y, Zilverstand A, Zugman A, Zwiebel HL. ENIGMA-anxiety working group: Rationale for and organization of large-scale neuroimaging studies of anxiety disorders. Hum Brain Mapp 2022; 43:83-112. [PMID: 32618421 PMCID: PMC8805695 DOI: 10.1002/hbm.25100] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 05/09/2020] [Accepted: 06/08/2020] [Indexed: 12/11/2022] Open
Abstract
Anxiety disorders are highly prevalent and disabling but seem particularly tractable to investigation with translational neuroscience methodologies. Neuroimaging has informed our understanding of the neurobiology of anxiety disorders, but research has been limited by small sample sizes and low statistical power, as well as heterogenous imaging methodology. The ENIGMA-Anxiety Working Group has brought together researchers from around the world, in a harmonized and coordinated effort to address these challenges and generate more robust and reproducible findings. This paper elaborates on the concepts and methods informing the work of the working group to date, and describes the initial approach of the four subgroups studying generalized anxiety disorder, panic disorder, social anxiety disorder, and specific phobia. At present, the ENIGMA-Anxiety database contains information about more than 100 unique samples, from 16 countries and 59 institutes. Future directions include examining additional imaging modalities, integrating imaging and genetic data, and collaborating with other ENIGMA working groups. The ENIGMA consortium creates synergy at the intersection of global mental health and clinical neuroscience, and the ENIGMA-Anxiety Working Group extends the promise of this approach to neuroimaging research on anxiety disorders.
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Affiliation(s)
- Janna Marie Bas‐Hoogendam
- Department of Developmental and Educational PsychologyLeiden University, Institute of Psychology Leiden The Netherlands
- Department of PsychiatryLeiden University Medical Center Leiden The Netherlands
- Leiden Institute for Brain and Cognition Leiden The Netherlands
| | - Nynke A. Groenewold
- Department of Psychiatry & Mental HealthUniversity of Cape Town Cape Town South Africa
| | - Moji Aghajani
- Department of PsychiatryAmsterdam UMC / VUMC Amsterdam The Netherlands
- Department of Research & InnovationGGZ inGeest Amsterdam The Netherlands
| | - Gabrielle F. Freitag
- National Institute of Mental Health, Emotion and Development Branch Bethesda Maryland USA
| | - Anita Harrewijn
- National Institute of Mental Health, Emotion and Development Branch Bethesda Maryland USA
| | - Kevin Hilbert
- Department of PsychologyHumboldt‐Universität zu Berlin Berlin Germany
| | - Neda Jahanshad
- University of Southern California Keck School of MedicineImaging Genetics Center, Mark and Mary Stevens Neuroimaging and Informatics Institute Los Angeles California USA
| | - Sophia I. Thomopoulos
- University of Southern California Keck School of MedicineImaging Genetics Center, Mark and Mary Stevens Neuroimaging and Informatics Institute Los Angeles California USA
| | - Paul M. Thompson
- University of Southern California Keck School of MedicineImaging Genetics Center, Mark and Mary Stevens Neuroimaging and Informatics Institute Los Angeles California USA
| | - Dick J. Veltman
- Department of PsychiatryAmsterdam UMC / VUMC Amsterdam The Netherlands
| | - Anderson M. Winkler
- National Institute of Mental Health, Emotion and Development Branch Bethesda Maryland USA
| | - Ulrike Lueken
- Department of PsychologyHumboldt‐Universität zu Berlin Berlin Germany
| | - Daniel S. Pine
- National Institute of Mental Health, Emotion and Development Branch Bethesda Maryland USA
| | - Nic J. A. Wee
- Department of PsychiatryLeiden University Medical Center Leiden The Netherlands
- Leiden Institute for Brain and Cognition Leiden The Netherlands
| | - Dan J. Stein
- Department of Psychiatry & Mental HealthUniversity of Cape Town Cape Town South Africa
- University of Cape TownSouth African MRC Unit on Risk & Resilience in Mental Disorders Cape Town South Africa
- University of Cape TownNeuroscience Institute Cape Town South Africa
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Hengoju S, Wohlfeil S, Munser AS, Boehme S, Beckert E, Shvydkiv O, Tovar M, Roth M, Rosenbaum MA. Optofluidic detection setup for multi-parametric analysis of microbiological samples in droplets. Biomicrofluidics 2020; 14:024109. [PMID: 32547676 PMCID: PMC7148121 DOI: 10.1063/1.5139603] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Accepted: 03/27/2020] [Indexed: 05/03/2023]
Abstract
High-throughput microbiological experimentation using droplet microfluidics is limited due to the complexity and restricted versatility of the available detection techniques. Current detection setups are bulky, complicated, expensive, and require tedious optical alignment procedures while still mostly limited to fluorescence. In this work, we demonstrate an optofluidic detection setup for multi-parametric analyses of droplet samples by easily integrating micro-lenses and embedding optical fibers for guiding light in and out of the microfluidic chip. The optofluidic setup was validated for detection of absorbance, fluorescence, and scattered light. The developed platform was used for simultaneous detection of multiple parameters in different microbiological applications like cell density determination, growth kinetics, and antibiotic inhibition assays. Combining the high-throughput potential of droplet microfluidics with the ease, flexibility, and simplicity of optical fibers results in a powerful platform for microbiological experiments.
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Affiliation(s)
| | - S. Wohlfeil
- Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Albert-Einstein-Str. 7, 07745 Jena, Germany
| | - A. S. Munser
- Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Albert-Einstein-Str. 7, 07745 Jena, Germany
| | - S. Boehme
- Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Albert-Einstein-Str. 7, 07745 Jena, Germany
| | - E. Beckert
- Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Albert-Einstein-Str. 7, 07745 Jena, Germany
| | - O. Shvydkiv
- Leibniz Institute for Natural Product Research and Infection Biology, Hans Knoell Institute, Beutenbergstr. 11a, 07745 Jena, Germany
| | - M. Tovar
- Leibniz Institute for Natural Product Research and Infection Biology, Hans Knoell Institute, Beutenbergstr. 11a, 07745 Jena, Germany
| | - M. Roth
- Leibniz Institute for Natural Product Research and Infection Biology, Hans Knoell Institute, Beutenbergstr. 11a, 07745 Jena, Germany
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Cybinski LM, Boehme S, Mühlberger A, Polak T, Herrmann MJ. Non-invasive brain stimulation for modulating a consolidated fear memory. PHARMACOPSYCHIATRY 2020. [DOI: 10.1055/s-0039-3403030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- LM Cybinski
- Universitätsklinikum Würzburg, Zentrum für Psychische Gesundheit, Germany
| | - S Boehme
- Universitätsklinikum Würzburg, Zentrum für Psychische Gesundheit, Germany
| | - A Mühlberger
- Universitätsklinikum Würzburg, Zentrum für Psychische Gesundheit, Germany
| | - T Polak
- Universitätsklinikum Würzburg, Zentrum für Psychische Gesundheit, Germany
| | - MJ Herrmann
- Universitätsklinikum Würzburg, Zentrum für Psychische Gesundheit, Germany
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Abstract
Patients suffering from mental disorders, especially anxiety disorders, are often impaired by inadequate emotional reactions. Specific aspects are the insufficient perception of their own emotional states and the use of dysfunctional emotion regulation strategies. Both aspects are interdependent. Thus, Cognitive Behavioral Therapy (CBT) comprises the development and training of adequate emotion regulation strategies. Traditionally, reappraisal is the most common strategy, but strategies of acceptance are becoming more important in the course of advancing CBT. Indeed, there is evidence that emotion regulation strategies differ in self-reported effectiveness, psychophysiological reactions, and underlying neural correlates. However, comprehensive comparisons of different emotion regulation strategies are sparse. The present study, therefore, compared the effect of three common emotion regulation strategies (reappraisal, acceptance, and suppression) on self-reported effectiveness, recollection, and psychophysiological as well as electroencephalographic dimensions. Twenty-nine healthy participants were instructed to either reappraise, accept, suppress, or passively observe their upcoming emotional reactions while anxiety- and sadness-inducing pictures were presented. Results showed a compelling effect of reappraisal on emotional experience, skin conductance response, and P300 amplitude. Acceptance was almost as effective as reappraisal, but led to increased emotional experience. Combining all results, suppression was shown to be the least effective but significantly decreased emotional experience when thoughts and feelings had to be suppressed. Moreover, results show that greater propensity for rumination differentially impairs strategies of emotion regulation.
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Affiliation(s)
- Stephanie Boehme
- Department of Psychology, Clinical Psychology and Psychotherapy, University of Regensburg, Universitätsstraße 31, D-93053 Regensburg, Germany.
| | - Stefanie C Biehl
- Department of Psychology, Clinical Psychology and Psychotherapy, University of Regensburg, Universitätsstraße 31, D-93053 Regensburg, Germany
| | - Andreas Mühlberger
- Department of Psychology, Clinical Psychology and Psychotherapy, University of Regensburg, Universitätsstraße 31, D-93053 Regensburg, Germany
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Herrmann M, Simons B, Horst A, Boehme S, Straube T, Polak T. Transcranial direct current stimulation (tDCS) of the right inferior frontal cortex (rIFC) attenuates sustained fear. Brain Stimul 2019. [DOI: 10.1016/j.brs.2018.12.400] [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: 10/27/2022] Open
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Herrmann MJ, Simons BS, Horst AK, Boehme S, Straube T, Polak T. Modulation of sustained fear by transcranial direct current stimulation (tDCS) of the right inferior frontal cortex (rIFC). Biol Psychol 2018; 139:173-177. [DOI: 10.1016/j.biopsycho.2018.10.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 07/11/2018] [Accepted: 10/19/2018] [Indexed: 01/05/2023]
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Gauvreau GM, FitzGerald JM, Boulet LP, Watson RM, Hui L, Villineuve H, Scime TX, Schlatman AR, Obminski C, Kum J, Boehme S, Ly TW, Bacon KB, O'Byrne PM. The effects of a CCR3 inhibitor, AXP1275, on allergen-induced airway responses in adults with mild-to-moderate atopic asthma. Clin Exp Allergy 2018; 48:445-451. [PMID: 29423947 DOI: 10.1111/cea.13114] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Revised: 01/08/2018] [Accepted: 01/28/2018] [Indexed: 12/17/2022]
Abstract
BACKGROUND CCR3 is the cognate receptor for major human eosinophil chemoattractants from the eotaxin family of proteins that are elevated in asthma and correlate with disease severity. OBJECTIVE This proof-of-mechanism study examined the effect of AXP1275, an oral, small-molecule inhibitor of CCR3, on airway responses to inhaled allergen challenge. METHODS Twenty-one subjects with mild atopic asthma and documented early and late asthmatic responses to an inhaled aeroallergen completed a randomized double-blind cross-over study to compare early and late allergen-induced asthmatic responses, methacholine PC20 , blood and sputum eosinophils and exhaled nitric oxide after 2 weeks of treatment with once-daily doses of AXP1275 (50 mg) or placebo. RESULTS There was a significant increase in methacholine PC20 after 12 days of AXP1275 treatment compared to placebo (increase of 0.92 doubling doses versus 0.17 doubling doses, P = .01), but this protection was lost post-allergen challenge. There was no effect of AXP1275 on allergen-induced late asthmatic responses, or eosinophils in blood and sputum. The early asthmatic response and exhaled nitric oxide levels were slightly lower with AXP1275, but this did not reach statistical significance. The number of subjects who experienced treatment-emergent adverse events while receiving AXP1275 was comparable placebo. CONCLUSIONS & CLINICAL RELEVANCE AXP1275 50 mg administered daily was safe and well tolerated, and there was no difference in the type, severity or frequency of treatment-emergent adverse events in subjects while receiving AXP1275 compared to placebo. AXP1275 increased the methacholine PC20 ; however, the low and variable exposure to APX1275 over a short treatment period may have contributed to poor efficacy on other outcomes.
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Affiliation(s)
| | | | - L P Boulet
- Institut Universitaire de Pneumologie et de Cardiologie de Québec, Québec, QC, Canada
| | - R M Watson
- McMaster University, Hamilton, ON, Canada
| | - L Hui
- University of British Columbia, Vancouver, BC, Canada
| | - H Villineuve
- Institut Universitaire de Pneumologie et de Cardiologie de Québec, Québec, QC, Canada
| | - T X Scime
- McMaster University, Hamilton, ON, Canada
| | | | - C Obminski
- McMaster University, Hamilton, ON, Canada
| | - J Kum
- University of British Columbia, Vancouver, BC, Canada
| | - S Boehme
- Axikin Pharmaceuticals Inc., San Diego, CA, USA
| | - T W Ly
- Axikin Pharmaceuticals Inc., San Diego, CA, USA
| | - K B Bacon
- Axikin Pharmaceuticals Inc., San Diego, CA, USA
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Herrmann MJ, Boehme S, Becker MPI, Tupak SV, Guhn A, Schmidt B, Brinkmann L, Straube T. Phasic and sustained brain responses in the amygdala and the bed nucleus of the stria terminalis during threat anticipation. Hum Brain Mapp 2015; 37:1091-102. [PMID: 26678871 DOI: 10.1002/hbm.23088] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [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: 07/29/2015] [Revised: 11/12/2015] [Accepted: 12/03/2015] [Indexed: 12/19/2022] Open
Abstract
Several lines of evidence suggest that the amygdala and the bed nucleus of the stria terminalis (BNST) are differentially involved in phasic and sustained fear. Even though, results from neuroimaging studies support this distinction, a specific effect of a temporal dissociation with phasic responses to onset versus sustained responses during prolonged states of threat anticipation has not been shown yet. To explore this issue, we investigated brain activation during anticipation of threat in 38 healthy participants by means of functional magnetic resonance imaging. Participants were presented different visual cues indicated the temporally unpredictable occurrence of a subsequent aversive or neutral stimulus. During the onset of aversive versus neutral anticipatory cues, results showed a differential phasic activation of amygdala, anterior cingulate cortex (ACC), and ventrolateral prefrontal cortex (PFC). In contrast, activation in the BNST and other brain regions, including insula, dorsolateral PFC, ACC, cuneus, posterior cingulate cortex, and periaqueductal grey was characterized by a sustained response during the threat versus neutral anticipation period. Analyses of functional connectivity showed phasic amygdala response as positively associated with activation, mainly in sensory cortex areas whereas sustained BNST activation was negatively associated with activation in visual cortex and positively correlated with activation in the insula and thalamus. These findings suggest that the amygdala is responsive to the onset of cues signaling the unpredictable occurrence of a potential threat while the BNST in concert with other areas is involved in sustained anxiety. Furthermore, the amygdala and BNST are characterized by distinctive connectivity patterns during threat anticipation.
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Affiliation(s)
- Martin J Herrmann
- Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital Würzburg, Fuechsleinstraße 15, Würzburg, D-97080, Germany
| | - Stephanie Boehme
- Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital Würzburg, Fuechsleinstraße 15, Würzburg, D-97080, Germany
| | - Michael P I Becker
- Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, Muenster, D-48149, Germany
| | - Sara V Tupak
- Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, Muenster, D-48149, Germany
| | - Anne Guhn
- Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital Würzburg, Fuechsleinstraße 15, Würzburg, D-97080, Germany
| | - Brigitte Schmidt
- Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital Würzburg, Fuechsleinstraße 15, Würzburg, D-97080, Germany
| | - Leonie Brinkmann
- Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, Muenster, D-48149, Germany
| | - Thomas Straube
- Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, Muenster, D-48149, Germany
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Wu J, Hafner C, Schramel JP, Kaun C, Krychtiuk KA, Wojta J, Boehme S, Ullrich R, Tretter EV, Markstaller K, Klein KU. Cyclic and constant hyperoxia cause inflammation, apoptosis and cell death in human umbilical vein endothelial cells. Acta Anaesthesiol Scand 2015; 60:492-501. [PMID: 26489399 DOI: 10.1111/aas.12646] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Revised: 09/02/2015] [Accepted: 09/09/2015] [Indexed: 12/14/2022]
Abstract
BACKGROUND Perioperative high-dose oxygen (O2 ) exposure can cause hyperoxia. While the effect of constant hyperoxia on the vascular endothelium has been investigated to some extent, the impact of cyclic hyperoxia largely remains unknown. We hypothesized that cyclic hyperoxia would induce more injury than constant hyperoxia to human umbilical vein endothelial cells (HUVECs). METHODS HUVECs were exposed to cyclic hyperoxia (5-95% O2 ) or constant hyperoxia (95% O2 ), normoxia (21% O2 ), and hypoxia (5% O2 ). Cell growth, viability (Annexin V/propidium iodide and 3-(4,5-dimethythiazol-2-yl)-2,5-diphenyl tetrazolium bromide, MTT) lactate dehydrogenase (LDH), release, cytokine (interleukin, IL and macrophage migration inhibitory factor, MIF) release, total antioxidant capacity (TAC), and superoxide dismutase activity (SOD) of cell lysate were assessed at baseline and 8, 24, and 72 h. A signal transduction pathway finder array for gene expression analysis was performed after 8 h. RESULTS Constant and cyclic hyperoxia-induced gradually detrimental effects on HUVECs. After 72 h, constant or cyclic hyperoxia exposure induced change in cytotoxic (LDH +12%, P = 0.026; apoptosis +121/61%, P < 0.01; alive cells -15%, P < 0.01; MTT -16/15%, P < 0.01), inflammatory (IL-6 +142/190%, P < 0.01; IL-8 +72/43%, P < 0.01; MIF +147/93%, P < 0.01), or redox-sensitive (SOD +278%, TAC-25% P < 0.01) markers. Gene expression analysis revealed that constant and cyclic hyperoxia exposure differently activates oxidative stress, nuclear factor kappa B, Notch, and peroxisome proliferator-activated receptor pathways. CONCLUSIONS Extreme hyperoxia exposure induces inflammation, apoptosis and cell death in HUVECs. Although our findings cannot be transferred to clinical settings, results suggest that hyperoxia exposure may cause vascular injury that could play a role in determining perioperative outcome.
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Affiliation(s)
- J. Wu
- Department of Anaesthesia; General Intensive Care and Pain Management; Medical University of Vienna; Vienna Austria
- Department of Anesthesiology; Union Hospital; Tongji Medical College; Huazhong University of Science and Technology; Wuhan China
| | - C. Hafner
- Department of Anaesthesia; General Intensive Care and Pain Management; Medical University of Vienna; Vienna Austria
| | - J. P. Schramel
- Unit of Anaesthesiology and Perioperative Intensive Care; University of Veterinary Medicine; Vienna Austria
| | - C. Kaun
- Department of Internal Medicine II; Medical University Vienna; Vienna Austria
- Core Facilities; Medical University of Vienna; Vienna Austria
| | - K. A. Krychtiuk
- Department of Internal Medicine II; Medical University Vienna; Vienna Austria
- Ludwig Boltzmann Cluster for Cardiovascular Research; Vienna Austria
| | - J. Wojta
- Department of Internal Medicine II; Medical University Vienna; Vienna Austria
- Core Facilities; Medical University of Vienna; Vienna Austria
- Ludwig Boltzmann Cluster for Cardiovascular Research; Vienna Austria
| | - S. Boehme
- Department of Anaesthesia; General Intensive Care and Pain Management; Medical University of Vienna; Vienna Austria
| | - R. Ullrich
- Department of Anaesthesia; General Intensive Care and Pain Management; Medical University of Vienna; Vienna Austria
| | - E. V. Tretter
- Department of Anaesthesia; General Intensive Care and Pain Management; Medical University of Vienna; Vienna Austria
| | - K. Markstaller
- Department of Anaesthesia; General Intensive Care and Pain Management; Medical University of Vienna; Vienna Austria
| | - K. U. Klein
- Department of Anaesthesia; General Intensive Care and Pain Management; Medical University of Vienna; Vienna Austria
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Boehme S, Ritter V, Tefikow S, Stangier U, Strauss B, Miltner WHR, Straube T. Neural correlates of emotional interference in social anxiety disorder. PLoS One 2015; 10:e0128608. [PMID: 26042738 PMCID: PMC4456154 DOI: 10.1371/journal.pone.0128608] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Accepted: 04/28/2015] [Indexed: 11/18/2022] Open
Abstract
Disorder-relevant but task-unrelated stimuli impair cognitive performance in social anxiety disorder (SAD); however, time course and neural correlates of emotional interference are unknown. The present study investigated time course and neural basis of emotional interference in SAD using event-related functional magnetic resonance imaging (fMRI). Patients with SAD and healthy controls performed an emotional stroop task which allowed examining interference effects on the current and the succeeding trial. Reaction time data showed an emotional interference effect in the current trial, but not the succeeding trial, specifically in SAD. FMRI data showed greater activation in the left amygdala, bilateral insula, medial prefrontal cortex (mPFC), dorsal anterior cingulate cortex (ACC), and left opercular part of the inferior frontal gyrus during emotional interference of the current trial in SAD patients. Furthermore, we found a positive correlation between patients' interference scores and activation in the mPFC, dorsal ACC and left angular/supramarginal gyrus. Taken together, results indicate a network of brain regions comprising amygdala, insula, mPFC, ACC, and areas strongly involved in language processing during the processing of task-unrelated threat in SAD. However, specifically the activation in mPFC, dorsal ACC, and left angular/supramarginal gyrus is associated with the strength of the interference effect, suggesting a cognitive network model of attentional bias in SAD. This probably comprises exceeded allocation of attentional resources to disorder-related information of the presented stimuli and increased self-referential and semantic processing of threat words in SAD.
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Affiliation(s)
- Stephanie Boehme
- Laboratory of Psychophysiology and functional Imaging, Department of Psychiatry, Psychosomatics & Psychotherapy, University Hospital Würzburg, Fuechsleinstr. 15, D-97080 Würzburg, Germany
- Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3 // 1, D-07743 Jena, Germany
| | - Viktoria Ritter
- Department of Clinical Psychology and Psychotherapy, Goethe-University Frankfurt, Varrentrappstr. 40–42, D-60486 Frankfurt am Main, Germany
| | - Susan Tefikow
- Institute of Psychosocial Medicine and Psychotherapy, Jena University Hospital—Friedrich Schiller University, Stoystr. 3, D-07740 Jena, Germany
| | - Ulrich Stangier
- Department of Clinical Psychology and Psychotherapy, Goethe-University Frankfurt, Varrentrappstr. 40–42, D-60486 Frankfurt am Main, Germany
| | - Bernhard Strauss
- Institute of Psychosocial Medicine and Psychotherapy, Jena University Hospital—Friedrich Schiller University, Stoystr. 3, D-07740 Jena, Germany
| | - Wolfgang H. R. Miltner
- Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3 // 1, D-07743 Jena, Germany
| | - Thomas Straube
- Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, D-48149 Muenster, Germany
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Boehme S, Miltner WHR, Straube T. Neural correlates of self-focused attention in social anxiety. Soc Cogn Affect Neurosci 2015; 10:856-62. [PMID: 25326038 PMCID: PMC4448029 DOI: 10.1093/scan/nsu128] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 07/24/2014] [Accepted: 10/14/2014] [Indexed: 11/13/2022] Open
Abstract
Socially anxious individuals tend to shift their attention away from external socially threatening cues and instead become highly self-focused. Such heightened self-focused attention has been suggested to be involved in the development and maintenance of social anxiety disorder. This study used functional magnetic resonance imaging to investigate the neural correlates of self-focused attention in 16 high socially anxious (HSA) and 16 low socially anxious (LSA) individuals. Participants were instructed to focus their attention either inwardly or outwardly during a simulated social situation. Results indicate hyperactivation of medial prefrontal cortex (mPFC), temporo-parietal junction (TPJ) and temporal pole during inward vs outward attention in HSA compared with LSA participants. Furthermore, activation of mPFC, right anterior insula, TPJ and posterior cingulate cortex was positively correlated with the trait of self-focused attention in HSA subjects. Results highlight the prominent role of the mPFC and other cortical structures in abnormal self-focused attention in social anxiety. Finally, findings for the insula suggest increased processing of bodily states that is related to the amount of habitual self-focused attention in social anxiety.
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Affiliation(s)
- Stephanie Boehme
- Laboratory of Psychophysiology and functional Imaging, Department of Psychiatry, Psychosomatics & Psychotherapy, University of Wüerzburg; Fuechsleinstr. 15, D-97080 Würzburg, Germany, Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3//1, D-07743 Jena, Germany, and Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, D-48149 Muenster, Germany Laboratory of Psychophysiology and functional Imaging, Department of Psychiatry, Psychosomatics & Psychotherapy, University of Wüerzburg; Fuechsleinstr. 15, D-97080 Würzburg, Germany, Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3//1, D-07743 Jena, Germany, and Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, D-48149 Muenster, Germany
| | - Wolfgang H R Miltner
- Laboratory of Psychophysiology and functional Imaging, Department of Psychiatry, Psychosomatics & Psychotherapy, University of Wüerzburg; Fuechsleinstr. 15, D-97080 Würzburg, Germany, Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3//1, D-07743 Jena, Germany, and Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, D-48149 Muenster, Germany
| | - Thomas Straube
- Laboratory of Psychophysiology and functional Imaging, Department of Psychiatry, Psychosomatics & Psychotherapy, University of Wüerzburg; Fuechsleinstr. 15, D-97080 Würzburg, Germany, Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3//1, D-07743 Jena, Germany, and Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, D-48149 Muenster, Germany
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Gruian C, Boehme S, Simon S, Steinhoff HJ, Klare JP. Assembly and function of the tRNA-modifying GTPase MnmE adsorbed to surface functionalized bioactive glass. ACS Appl Mater Interfaces 2014; 6:7615-7625. [PMID: 24785159 DOI: 10.1021/am500933e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Protein adsorption onto solid surfaces is a common phenomenon in tissue engineering related applications, and considerable progress was achieved in this field. However, there are still unanswered questions or contradictory opinions concerning details of the protein's structure, conformational changes, or aggregation once adsorbed onto solid surfaces. Electron paramagnetic resonance (EPR) spectroscopy and site-directed spin labeling (SDSL) were employed in this work to investigate the conformational changes and dynamics of the tRNA-modifying dimeric protein MnmE from E. coli, an ortholog of the human GTPBP3, upon adsorption on bioactive glass mimicking the composition of the classical 45S5 Bioglass. In addition, prior to protein attachment, the bioactive glass surface was modified with the protein coupling agent glutaraldehyde. Continuous wave EPR spectra of different spin labeled MnmE mutants were recorded to assess the dynamics of the attached spin labels before and after protein adsorption. The area of the continuous wave (cw)-EPR absorption spectrum was further used to determine the amount of the attached protein. Double electron-electron resonance (DEER) experiments were conducted to measure distances between the spin labels before and after adsorption. The results revealed that the contact regions between MnmE and the bioactive glass surface are located at the G domains and at the N-terminal domains. The low modulation depths of all DEER time traces recorded for the adsorbed single MnmE mutants, corroborated with the DEER measurements performed on MnmE double mutants, show that the adsorption process leads to dissociation of the dimer and alters the tertiary structure of MnmE, thereby abolishing its functionality. However, glutaraldehyde reduces the aggressiveness of the adsorption process and improves the stability of the protein attachment.
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Affiliation(s)
- C Gruian
- Faculty of Physics and Institute of Interdisciplinary Research in Bio-Nano-Sciences, Babes-Bolyai University , Cluj-Napoca, 400084, Romania
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Boehme S, Hirte K, Fabian S, Hupel C, Schreiber T, Eberhardt R, Tünnermann A. CO2-laser-based coating process for high power fiber application. ACTA ACUST UNITED AC 2014. [DOI: 10.1117/12.2036357] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Boehme S, Mohr A, Becker MPI, Miltner WHR, Straube T. Area-dependent time courses of brain activation during video-induced symptom provocation in social anxiety disorder. Biol Mood Anxiety Disord 2014; 4:6. [PMID: 24921039 PMCID: PMC4052290 DOI: 10.1186/2045-5380-4-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Accepted: 04/11/2014] [Indexed: 05/16/2023]
Abstract
BACKGROUND Previous functional imaging studies using symptom provocation in patients with social anxiety disorder (SAD) reported inconsistent findings, which might be at least partially related to different time-dependent activation profiles in different brain areas. In the present functional magnetic resonance imaging study, we used a novel video-based symptom provocation design in order to investigate the magnitude and time course of activation in different brain areas in 20 SAD patients and 20 healthy controls. RESULTS The disorder-related videos induced increased anxiety in patients with SAD as compared to healthy controls. Analyses of brain activation to disorder-related versus neutral video clips revealed amygdala activation during the first but not during the second half of the clips in patients as compared to controls. In contrast, the activation in the insula showed a reversed pattern with increased activation during the second but not during the first half of the video clips. Furthermore, a cluster in the anterior dorsal anterior cingulate cortex showed a sustained response for the entire duration of the videos. CONCLUSIONS The present findings suggest that different regions of the fear network show differential temporal response patterns during video-induced symptom provocation in SAD. While the amygdala is involved during initial threat processing, the insula seems to be more involved during subsequent anxiety responses. In accordance with cognitive models of SAD, a medial prefrontal region engaged in emotional-cognitive interactions is generally hyperactivated.
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Affiliation(s)
- Stephanie Boehme
- Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3 // 1, Jena D-07743, Germany
| | - Alexander Mohr
- Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3 // 1, Jena D-07743, Germany
| | - Michael PI Becker
- Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, Muenster D-48149, Germany
| | - Wolfgang HR Miltner
- Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3 // 1, Jena D-07743, Germany
| | - Thomas Straube
- Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, Muenster D-48149, Germany
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Boehme S, Ritter V, Tefikow S, Stangier U, Strauss B, Miltner WHR, Straube T. Brain activation during anticipatory anxiety in social anxiety disorder. Soc Cogn Affect Neurosci 2013; 9:1413-8. [PMID: 23938870 DOI: 10.1093/scan/nst129] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Exaggerated anticipatory anxiety during expectation of performance-related situations is an important feature of the psychopathology of social anxiety disorder (SAD). The neural basis of anticipatory anxiety in SAD has not been investigated in controlled studies. The current study used functional magnetic resonance imaging (fMRI) to investigate the neural correlates during the anticipation of public and evaluated speaking vs a control condition in 17 SAD patients and 17 healthy control subjects. FMRI results show increased activation of the insula and decreased activation of the ventral striatum in SAD patients, compared to control subjects during anticipation of a speech vs the control condition. In addition, an activation of the amygdala in SAD patients during the first half of the anticipation phase in the speech condition was observed. Finally, the amount of anticipatory anxiety of SAD patients was negatively correlated to the activation of the ventral striatum. This suggests an association between incentive function, motivation and anticipatory anxiety when SAD patients expect a performance situation.
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Affiliation(s)
- Stephanie Boehme
- Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3/1, D-07743 Jena, Department of Clinical Psychology and Psychotherapy, Goethe-University Frankfurt, Varrentrappstr. 40-42, D-60486 Frankfurt am Main, Institute of Psychosocial Medicine and Psychotherapy, Jena University Hospital-Friedrich Schiller University, Stoystr. 3, D-07740 Jena and Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, D-48149 Muenster, Germany
| | - Viktoria Ritter
- Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3/1, D-07743 Jena, Department of Clinical Psychology and Psychotherapy, Goethe-University Frankfurt, Varrentrappstr. 40-42, D-60486 Frankfurt am Main, Institute of Psychosocial Medicine and Psychotherapy, Jena University Hospital-Friedrich Schiller University, Stoystr. 3, D-07740 Jena and Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, D-48149 Muenster, Germany
| | - Susan Tefikow
- Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3/1, D-07743 Jena, Department of Clinical Psychology and Psychotherapy, Goethe-University Frankfurt, Varrentrappstr. 40-42, D-60486 Frankfurt am Main, Institute of Psychosocial Medicine and Psychotherapy, Jena University Hospital-Friedrich Schiller University, Stoystr. 3, D-07740 Jena and Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, D-48149 Muenster, Germany
| | - Ulrich Stangier
- Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3/1, D-07743 Jena, Department of Clinical Psychology and Psychotherapy, Goethe-University Frankfurt, Varrentrappstr. 40-42, D-60486 Frankfurt am Main, Institute of Psychosocial Medicine and Psychotherapy, Jena University Hospital-Friedrich Schiller University, Stoystr. 3, D-07740 Jena and Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, D-48149 Muenster, Germany
| | - Bernhard Strauss
- Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3/1, D-07743 Jena, Department of Clinical Psychology and Psychotherapy, Goethe-University Frankfurt, Varrentrappstr. 40-42, D-60486 Frankfurt am Main, Institute of Psychosocial Medicine and Psychotherapy, Jena University Hospital-Friedrich Schiller University, Stoystr. 3, D-07740 Jena and Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, D-48149 Muenster, Germany
| | - Wolfgang H R Miltner
- Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3/1, D-07743 Jena, Department of Clinical Psychology and Psychotherapy, Goethe-University Frankfurt, Varrentrappstr. 40-42, D-60486 Frankfurt am Main, Institute of Psychosocial Medicine and Psychotherapy, Jena University Hospital-Friedrich Schiller University, Stoystr. 3, D-07740 Jena and Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, D-48149 Muenster, Germany
| | - Thomas Straube
- Department of Biological and Clinical Psychology, Friedrich Schiller University Jena, Am Steiger 3/1, D-07743 Jena, Department of Clinical Psychology and Psychotherapy, Goethe-University Frankfurt, Varrentrappstr. 40-42, D-60486 Frankfurt am Main, Institute of Psychosocial Medicine and Psychotherapy, Jena University Hospital-Friedrich Schiller University, Stoystr. 3, D-07740 Jena and Institute of Medical Psychology and Systems Neuroscience, University of Muenster, Von-Esmarch-Str. 52, D-48149 Muenster, Germany
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Schmack B, Weymann A, Klein K, Boehme S, Stiller W, Hartmann E, Stadtfeld S, Mayer J, Markstaller K, Kauczor HU, Karck M, Szabo G. Assessment of Right Ventricular Pressure-Volume Relationships Using 256-Slice CT in an Experimental Model of Acute Pulmonary Hypertension. J Heart Lung Transplant 2013. [DOI: 10.1016/j.healun.2013.01.861] [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: 10/27/2022] Open
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18
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Klein K, Boehme S, Hartmann E, Szczyrba M, Heylen L, Liu T, David M, Werner C, Markstaller K, Engelhard K. Transmission of arterial oxygen partial pressure oscillations to the cerebral microcirculation in a porcine model of acute lung injury caused by cyclic recruitment and derecruitment. Br J Anaesth 2013; 110:266-73. [DOI: 10.1093/bja/aes376] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Mayer JL, Pahn G, Schmack B, Boehme S, Weinheimer O, Klein U, Szabó G, Markstaller K, Kauczor HU, Heussel CP, Stiller W. Vierdimensionale Quantifizierung der Ventilation mittels dynamischer MDCT bei ARDS im Tiermodell. ROFO-FORTSCHR RONTG 2012. [DOI: 10.1055/s-0032-1311216] [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: 10/28/2022]
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Wang H, Bodenstein M, Duenges B, Ganatti S, Boehme S, Ning Y, Roehrig B, Markstaller K. Ventilator-Associated Lung Injury Superposed to Oleic Acid Infusion or Surfactant Depletion: Histopathological Characteristics of Two Porcine Models of Acute Lung Injury. Eur Surg Res 2010; 45:121-33. [DOI: 10.1159/000318599] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2009] [Accepted: 07/02/2010] [Indexed: 11/19/2022]
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21
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Zang YC, Kozovska M, Aebischer I, Li S, Boehme S, Crowe P, Rivera VM, Zhang JZ. Restricted TCR Valpha gene rearrangements in T cells recognizing an immunodominant peptide of myelin basic protein in DR2 patients with multiple sclerosis. Int Immunol 1998; 10:991-8. [PMID: 9701037 DOI: 10.1093/intimm/10.7.991] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
T cell responses to myelin basic protein (MBP) are thought to play an important role in the pathogenesis of multiple sclerosis (MS). The response to the 83-99 region of MBP represents a dominant response to MBP in patients with MS and is associated with HLA-DR2 that is linked with susceptibility to MS. Although T cell clones reactive to various regions of MBP have been found to exhibit heterogeneous TCR Vbeta gene usage in patients with MS, it is unclear whether T cell clones uniformly recognizing the 83-99 peptide of MBP in the context of the same DR molecule would have restricted TCR V gene rearrangements and recognition motifs. In this study, a panel of DR2- or DR4-restricted T cell clones specific for the MBP83-99 peptide were derived from 11 patients with MS and examined for TCR V gene usage by PCR and the recognition motifs using analog peptides. Our study revealed that despite a few T cell clone pairs having similar recognition motifs and shared sequence homology in the CDR3, the overall recognition motifs of MBP83-99-specific T cells were considerably diverse. Interestingly, the DR2-restricted T cell clones displayed a biased V gene usage for Valpha3 and Valpha8, while Vbeta gene rearrangements were highly heterogeneous. This study provided experimental evidence suggesting a limited heterogeneity in TCR Valpha gene rearrangements of MBP-reactive T cells in DR2 patients with MS.
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Affiliation(s)
- Y C Zang
- Department of Neurology and Baylor-Methodist International Multiple Sclerosis Center, Baylor College of Medicine, Veterans Affairs Medical Center, Houston, TX 77030, USA
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König K, Boehme S, Leclerc N, Ahuja R. Time-gated autofluorescence microscopy of motile green microalga in an optical trap. Cell Mol Biol (Noisy-le-grand) 1998; 44:763-70. [PMID: 9764746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Ultrafast time-gated fluorescence imaging of optically trapped single motile cells is presented. The biflagellar green microalga Haematococcus pluvialis was confined with picoNewton trapping forces in the focal volume of a high numerical aperture objective by near infrared multitraps. Trapping radiation of 100 mW power at the sample was provided by a Nd:YLF laser (1047 nm) operating in the cw mode. Simultaneously, cellular autofluorescence was excited with a 633 nm picosecond 80 MHz laser diode. An ultrafast gated intensified slow scan CCD camera system with a tunable gate width (200 ps-1 ms) and tunable time-delay (0-20 ns) between excitation and detection was used as fluorescence detector. We demonstrate fluorescence imaging of high temporal (sub-ns) and high spatial (sub-microm) resolution and fluorescence lifetime determination of intracellular autofluorescence based on chlorophyll excitation. Exposure to the herbicide DCMU resulted in an increase of fluorescence intensity and lifetime by 250% and 150%, respectively.
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Affiliation(s)
- K König
- Institute of Anatomy II, Friedrich Schiller University, Jena, Germany
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Lenardo MJ, Boehme S, Chen L, Combadiere B, Fisher G, Freedman M, McFarland H, Pelfrey C, Zheng L. Autocrine feedback death and the regulation of mature T lymphocyte antigen responses. Int Rev Immunol 1995; 13:115-34. [PMID: 8789425 DOI: 10.3109/08830189509061742] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Antigen-induced T cell death is an important regulatory mechanism in the peripheral immune system. Evidence suggests that this process depends on T cell growth-inducing lymphokines such as IL-2 and occurs in proportion to the degree of T cell receptor occupancy. Strong T cell receptor stimulation leads to the synthesis of death molecules such as Fas ligand and tumor necrosis factor that cause T cell suicide. We propose that T cell death under these circumstances is the culmination of a feedback control mechanism termed propriocidal regulation or autocrine feedback death that regulates the expansion of specific T cell clones under conditions of high lymphokine and antigen load. In a quasi-stochastic system such as the antigen receptor repertoire, feedback information may be essential for the appropriate regulation of peripheral immune responses. Our understanding of this feedback mechanism affords a means to manipulate antigen-specific T cell death in vivo. The application of this approach to the therapy of T cell-medicated immunological diseases is discussed.
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Affiliation(s)
- M J Lenardo
- Laboratory of Immunology, National Institute for Allergy and Infectious Diseases, Bethesda, MD 20892-1982, USA
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Wakeland EK, Boehme S, She JX, Lu CC, McIndoe RA, Cheng I, Ye Y, Potts WK. Ancestral polymorphisms of MHC class II genes: divergent allele advantage. Immunol Res 1990; 9:115-22. [PMID: 2189934 DOI: 10.1007/bf02918202] [Citation(s) in RCA: 107] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- E K Wakeland
- Department of Pathology and Laboratory Medicine, University of Florida, Gainesville
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Affiliation(s)
- E K Wakeland
- Department of Pathology, University of Florida, Gainesville 32610
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