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Tolentino Collado J, Bodis E, Pasitka J, Szucs M, Fekete Z, Kis-Bicskei N, Telek E, Pozsonyi K, Kapetanaki SM, Greetham G, Tonge PJ, Meech SR, Lukacs A. Single Amino Acid Mutation Decouples Photochemistry of the BLUF Domain from the Enzymatic Function of OaPAC and Drives the Enzyme to a Switched-on State. J Mol Biol 2024; 436:168312. [PMID: 37827329 DOI: 10.1016/j.jmb.2023.168312] [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: 06/23/2023] [Revised: 09/29/2023] [Accepted: 10/05/2023] [Indexed: 10/14/2023]
Abstract
Photoactivated adenylate cyclases (PACs) are light-activated enzymes that combine a BLUF (blue-light using flavin) domain and an adenylate cyclase domain that are able to increase the levels of the important second messenger cAMP (cyclic adenosine monophosphate) upon blue-light excitation. The light-induced changes in the BLUF domain are transduced to the adenylate cyclase domain via a mechanism that has not yet been established. One critical residue in the photoactivation mechanism of BLUF domains, present in the vicinity of the flavin is the glutamine amino acid close to the N5 of the flavin. The role of this residue has been investigated extensively both experimentally and theoretically. However, its role in the activity of the photoactivated adenylate cyclase, OaPAC has never been addressed. In this work, we applied ultrafast transient visible and infrared spectroscopies to study the photochemistry of the Q48E OaPAC mutant. This mutation altered the primary electron transfer process and switched the enzyme into a permanent 'on' state, able to increase the cAMP levels under dark conditions compared to the cAMP levels of the dark-adapted state of the wild-type OaPAC. Differential scanning calorimetry measurements point to a less compact structure for the Q48E OaPAC mutant. The ensemble of these findings provide insight into the important elements in PACs and how their fine tuning may help in the design of optogenetic devices.
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Affiliation(s)
| | - Emoke Bodis
- Department of Biophysics, Medical School, University of Pecs, Szigeti str. 12, 7624 Pecs, Hungary
| | - Jonatan Pasitka
- Department of Biophysics, Medical School, University of Pecs, Szigeti str. 12, 7624 Pecs, Hungary
| | - Mihaly Szucs
- Department of Biophysics, Medical School, University of Pecs, Szigeti str. 12, 7624 Pecs, Hungary
| | - Zsuzsanna Fekete
- Department of Biophysics, Medical School, University of Pecs, Szigeti str. 12, 7624 Pecs, Hungary
| | - Nikolett Kis-Bicskei
- Department of Biophysics, Medical School, University of Pecs, Szigeti str. 12, 7624 Pecs, Hungary
| | - Elek Telek
- Department of Biophysics, Medical School, University of Pecs, Szigeti str. 12, 7624 Pecs, Hungary
| | - Kinga Pozsonyi
- Department of Biophysics, Medical School, University of Pecs, Szigeti str. 12, 7624 Pecs, Hungary
| | - Sofia M Kapetanaki
- Department of Biophysics, Medical School, University of Pecs, Szigeti str. 12, 7624 Pecs, Hungary
| | - Greg Greetham
- Central Laser Facility, Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot OX11 0QX, UK
| | - Peter J Tonge
- Department of Chemistry, Stony Brook University, New York 11794, United States.
| | - Stephen R Meech
- School of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UK.
| | - Andras Lukacs
- Department of Biophysics, Medical School, University of Pecs, Szigeti str. 12, 7624 Pecs, Hungary.
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2
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Ujfalusi-Pozsonyi K, Bódis E, Nyitrai M, Kengyel A, Telek E, Pécsi I, Fekete Z, Varnyuné Kis-Bicskei N, Mas C, Moussaoui D, Pernot P, Tully MD, Weik M, Schirò G, Kapetanaki SM, Lukács A. ATP-dependent conformational dynamics in a photoactivated adenylate cyclase revealed by fluorescence spectroscopy and small-angle X-ray scattering. Commun Biol 2024; 7:147. [PMID: 38307988 PMCID: PMC10837130 DOI: 10.1038/s42003-024-05842-1] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Accepted: 01/22/2024] [Indexed: 02/04/2024] Open
Abstract
Structural insights into the photoactivated adenylate cyclases can be used to develop new ways of controlling cellular cyclic adenosine monophosphate (cAMP) levels for optogenetic and other applications. In this work, we use an integrative approach that combines biophysical and structural biology methods to provide insight on the interaction of adenosine triphosphate (ATP) with the dark-adapted state of the photoactivated adenylate cyclase from the cyanobacterium Oscillatoria acuminata (OaPAC). A moderate affinity of the nucleotide for the enzyme was calculated and the thermodynamic parameters of the interaction have been obtained. Stopped-flow fluorescence spectroscopy and small-angle solution scattering have revealed significant conformational changes in the enzyme, presumably in the adenylate cyclase (AC) domain during the allosteric mechanism of ATP binding to OaPAC with small and large-scale movements observed to the best of our knowledge for the first time in the enzyme in solution upon ATP binding. These results are in line with previously reported drastic conformational changes taking place in several class III AC domains upon nucleotide binding.
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Affiliation(s)
- K Ujfalusi-Pozsonyi
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary
| | - E Bódis
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary
| | - M Nyitrai
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary
| | - A Kengyel
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary
| | - E Telek
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary
| | - I Pécsi
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary
| | - Z Fekete
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary
| | | | - C Mas
- Univ. Grenoble Alpes, CNRS, CEA, EMBL, ISBG, F-38000, Grenoble, France
| | - D Moussaoui
- European Synchrotron Radiation Facility (ESRF), Grenoble, France
| | - P Pernot
- European Synchrotron Radiation Facility (ESRF), Grenoble, France
| | - M D Tully
- European Synchrotron Radiation Facility (ESRF), Grenoble, France
| | - M Weik
- Institut de Biologie Structurale (IBS), Université Grenoble Alpes, CEA, CNRS, Grenoble, France
| | - G Schirò
- Institut de Biologie Structurale (IBS), Université Grenoble Alpes, CEA, CNRS, Grenoble, France
| | - S M Kapetanaki
- Institut de Biologie Structurale (IBS), Université Grenoble Alpes, CEA, CNRS, Grenoble, France.
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary.
| | - A Lukács
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary.
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3
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Nagy-Pál P, Veres JM, Fekete Z, Karlócai MR, Weisz F, Barabás B, Reéb Z, Hájos N. Structural Organization of Perisomatic Inhibition in the Mouse Medial Prefrontal Cortex. J Neurosci 2023; 43:6972-6987. [PMID: 37640552 PMCID: PMC10586541 DOI: 10.1523/jneurosci.0432-23.2023] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 08/11/2023] [Accepted: 08/18/2023] [Indexed: 08/31/2023] Open
Abstract
Perisomatic inhibition profoundly controls neural function. However, the structural organization of inhibitory circuits giving rise to the perisomatic inhibition in the higher-order cortices is not completely known. Here, we performed a comprehensive analysis of those GABAergic cells in the medial prefrontal cortex (mPFC) that provide inputs onto the somata and proximal dendrites of pyramidal neurons. Our results show that most GABAergic axonal varicosities contacting the perisomatic region of superficial (layer 2/3) and deep (layer 5) pyramidal cells express parvalbumin (PV) or cannabinoid receptor type 1 (CB1). Further, we found that the ratio of PV/CB1 GABAergic inputs is larger on the somatic membrane surface of pyramidal tract neurons in comparison with those projecting to the contralateral hemisphere. Our morphologic analysis of in vitro labeled PV+ basket cells (PVBC) and CCK/CB1+ basket cells (CCKBC) revealed differences in many features. PVBC dendrites and axons arborized preferentially within the layer where their soma was located. In contrast, the axons of CCKBCs expanded throughout layers, although their dendrites were found preferentially either in superficial or deep layers. Finally, using anterograde trans-synaptic tracing we observed that PVBCs are preferentially innervated by thalamic and basal amygdala afferents in layers 5a and 5b, respectively. Thus, our results suggest that PVBCs can control the local circuit operation in a layer-specific manner via their characteristic arborization, whereas CCKBCs rather provide cross-layer inhibition in the mPFC.SIGNIFICANCE STATEMENT Inhibitory cells in cortical circuits are crucial for the precise control of local network activity. Nevertheless, in higher-order cortical areas that are involved in cognitive functions like decision-making, working memory, and cognitive flexibility, the structural organization of inhibitory cell circuits is not completely understood. In this study we show that perisomatic inhibitory control of excitatory cells in the medial prefrontal cortex is performed by two types of basket cells endowed with different morphologic properties that provide inhibitory inputs with distinct layer specificity on cells projecting to disparate areas. Revealing this difference in innervation strategy of the two basket cell types is a key step toward understanding how they fulfill their distinct roles in cortical network operations.
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Affiliation(s)
- Petra Nagy-Pál
- Eötvös Loránd Research Network Institute of Experimental Medicine, 1083 Budapest, Hungary
- János Szentágothai School of Neurosciences, Semmelweis University, 1085 Budapest, Hungary
| | - Judit M Veres
- Eötvös Loránd Research Network Institute of Experimental Medicine, 1083 Budapest, Hungary
| | - Zsuzsanna Fekete
- Eötvös Loránd Research Network Institute of Experimental Medicine, 1083 Budapest, Hungary
- János Szentágothai School of Neurosciences, Semmelweis University, 1085 Budapest, Hungary
| | - Mária R Karlócai
- Eötvös Loránd Research Network Institute of Experimental Medicine, 1083 Budapest, Hungary
| | - Filippo Weisz
- Eötvös Loránd Research Network Institute of Experimental Medicine, 1083 Budapest, Hungary
| | - Bence Barabás
- Eötvös Loránd Research Network Institute of Experimental Medicine, 1083 Budapest, Hungary
- János Szentágothai School of Neurosciences, Semmelweis University, 1085 Budapest, Hungary
| | - Zsófia Reéb
- Eötvös Loránd Research Network Institute of Experimental Medicine, 1083 Budapest, Hungary
- Doctoral School of Biology, Institute of Biology, Eötvös Loránd University, 1117 Budapest, Hungary
| | - Norbert Hájos
- Eötvös Loránd Research Network Institute of Experimental Medicine, 1083 Budapest, Hungary
- Linda and Jack Gill Center for Molecular Bioscience, Indiana University Bloomington, Bloomington, Indiana 47405
- Program in Neuroscience, Department of Psychological and Brain Sciences, Indiana University Bloomington, Bloomington, Indiana 47405
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4
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Veres JM, Fekete Z, Müller K, Andrasi T, Rovira-Esteban L, Barabas B, Papp OI, Hajos N. Fear learning and aversive stimuli differentially change excitatory synaptic transmission in perisomatic inhibitory cells of the basal amygdala. Front Cell Neurosci 2023; 17:1120338. [PMID: 37731462 PMCID: PMC10507864 DOI: 10.3389/fncel.2023.1120338] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 08/22/2023] [Indexed: 09/22/2023] Open
Abstract
Inhibitory circuits in the basal amygdala (BA) have been shown to play a crucial role in associative fear learning. How the excitatory synaptic inputs received by BA GABAergic interneurons are influenced by memory formation, a network parameter that may contribute to learning processes, is still largely unknown. Here, we investigated the features of excitatory synaptic transmission received by the three types of perisomatic inhibitory interneurons upon cue-dependent fear conditioning and aversive stimulus and tone presentations without association. Acute slices were prepared from transgenic mice: one group received tone presentation only (conditioned stimulus, CS group), the second group was challenged by mild electrical shocks unpaired with the CS (unsigned unconditioned stimulus, unsigned US group) and the third group was presented with the CS paired with the US (signed US group). We found that excitatory synaptic inputs (miniature excitatory postsynaptic currents, mEPSCs) recorded in distinct interneuron types in the BA showed plastic changes with different patterns. Parvalbumin (PV) basket cells in the unsigned US and signed US group received mEPSCs with reduced amplitude and rate in comparison to the only CS group. Coupling the US and CS in the signed US group caused a slight increase in the amplitude of the events in comparison to the unsigned US group, where the association of CS and US does not take place. Excitatory synaptic inputs onto cholecystokinin (CCK) basket cells showed a markedly different change from PV basket cells in these behavioral paradigms: only the decay time was significantly faster in the unsigned US group compared to the only CS group, whereas the amplitude of mEPSCs increased in the signed US group compared to the only CS group. Excitatory synaptic inputs received by PV axo-axonic cells showed the least difference in the three behavioral paradigm: the only significant change was that the rate of mEPSCs increased in the signed US group when compared to the only CS group. These results collectively show that associative learning and aversive stimuli unpaired with CS cause different changes in excitatory synaptic transmission in BA perisomatic interneuron types, supporting the hypothesis that they play distinct roles in the BA network operations upon pain information processing and fear memory formation.
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Affiliation(s)
- Judit M. Veres
- Laboratory of Network Neurophysiology, ELRN Institute of Experimental Medicine, Budapest, Hungary
| | - Zsuzsanna Fekete
- Laboratory of Network Neurophysiology, ELRN Institute of Experimental Medicine, Budapest, Hungary
- János Szentágothai School of Neurosciences, Semmelweis University, Budapest, Hungary
| | - Kinga Müller
- Laboratory of Network Neurophysiology, ELRN Institute of Experimental Medicine, Budapest, Hungary
- János Szentágothai School of Neurosciences, Semmelweis University, Budapest, Hungary
| | - Tibor Andrasi
- Laboratory of Network Neurophysiology, ELRN Institute of Experimental Medicine, Budapest, Hungary
| | - Laura Rovira-Esteban
- Laboratory of Network Neurophysiology, ELRN Institute of Experimental Medicine, Budapest, Hungary
| | - Bence Barabas
- Laboratory of Network Neurophysiology, ELRN Institute of Experimental Medicine, Budapest, Hungary
- János Szentágothai School of Neurosciences, Semmelweis University, Budapest, Hungary
| | - Orsolya I. Papp
- Laboratory of Network Neurophysiology, ELRN Institute of Experimental Medicine, Budapest, Hungary
| | - Norbert Hajos
- Laboratory of Network Neurophysiology, ELRN Institute of Experimental Medicine, Budapest, Hungary
- The Linda and Jack Gill Center for Molecular Bioscience, Indiana University Bloomington, Bloomington, IN, United States
- Program in Neuroscience, Department of Psychological and Brain Sciences, Indiana University Bloomington, Bloomington, IN, United States
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Raics K, Pirisi K, Zhuang B, Fekete Z, Kis-Bicskei N, Pecsi I, Ujfalusi KP, Telek E, Li Y, Collado JT, Tonge PJ, Meech SR, Vos MH, Bodis E, Lukacs A. Photocycle alteration and increased enzymatic activity in genetically modified photoactivated adenylate cyclase OaPAC. J Biol Chem 2023; 299:105056. [PMID: 37468104 PMCID: PMC10448171 DOI: 10.1016/j.jbc.2023.105056] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 06/30/2023] [Accepted: 07/11/2023] [Indexed: 07/21/2023] Open
Abstract
Photoactivated adenylate cyclases (PACs) are light activated enzymes that combine blue light sensing capacity with the ability to convert ATP to cAMP and pyrophosphate (PPi) in a light-dependent manner. In most of the known PACs blue light regulation is provided by a blue light sensing domain using flavin which undergoes a structural reorganization after blue-light absorption. This minor structural change then is translated toward the C-terminal of the protein, inducing a larger conformational change that results in the ATP conversion to cAMP. As cAMP is a key second messenger in numerous signal transduction pathways regulating various cellular functions, PACs are of great interest in optogenetic studies. The optimal optogenetic device must be "silent" in the dark and highly responsive upon light illumination. PAC from Oscillatoria acuminata is a very good candidate as its basal activity is very small in the dark and the conversion rates increase 20-fold upon light illumination. We studied the effect of replacing D67 to N, in the blue light using flavin domain. This mutation was found to accelerate the primary electron transfer process in the photosensing domain of the protein, as has been predicted. Furthermore, it resulted in a longer lived signaling state, which was formed with a lower quantum yield. Our studies show that the overall effects of the D67N mutation lead to a slightly higher conversion of ATP to cAMP, which points in the direction that by fine tuning the kinetic properties more responsive PACs and optogenetic devices can be generated.
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Affiliation(s)
- Katalin Raics
- Department of Biophysics, Medical School, University of Pecs, Pecs, Hungary
| | - Katalin Pirisi
- Department of Biophysics, Medical School, University of Pecs, Pecs, Hungary
| | - Bo Zhuang
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, Palaiseau, France
| | - Zsuzsanna Fekete
- Department of Biophysics, Medical School, University of Pecs, Pecs, Hungary
| | | | - Ildiko Pecsi
- Department of Biophysics, Medical School, University of Pecs, Pecs, Hungary
| | | | - Elek Telek
- Department of Biophysics, Medical School, University of Pecs, Pecs, Hungary
| | - Yin Li
- Department of Physics, School of Physics and Materials Science, Nanchang University, Nanchang City, China
| | | | - Peter J Tonge
- Department of Chemistry, Stony Brook University, New York, USA
| | | | - Marten H Vos
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, Palaiseau, France
| | - Emoke Bodis
- Department of Biophysics, Medical School, University of Pecs, Pecs, Hungary.
| | - Andras Lukacs
- Department of Biophysics, Medical School, University of Pecs, Pecs, Hungary.
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Fekete Z, Zátonyi A, Kaszás A, Madarász M, Slézia A. Transparent neural interfaces: challenges and solutions of microengineered multimodal implants designed to measure intact neuronal populations using high-resolution electrophysiology and microscopy simultaneously. Microsyst Nanoeng 2023; 9:66. [PMID: 37213820 PMCID: PMC10195795 DOI: 10.1038/s41378-023-00519-x] [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] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 02/03/2023] [Accepted: 03/01/2023] [Indexed: 05/23/2023]
Abstract
The aim of this review is to present a comprehensive overview of the feasibility of using transparent neural interfaces in multimodal in vivo experiments on the central nervous system. Multimodal electrophysiological and neuroimaging approaches hold great potential for revealing the anatomical and functional connectivity of neuronal ensembles in the intact brain. Multimodal approaches are less time-consuming and require fewer experimental animals as researchers obtain denser, complex data during the combined experiments. Creating devices that provide high-resolution, artifact-free neural recordings while facilitating the interrogation or stimulation of underlying anatomical features is currently one of the greatest challenges in the field of neuroengineering. There are numerous articles highlighting the trade-offs between the design and development of transparent neural interfaces; however, a comprehensive overview of the efforts in material science and technology has not been reported. Our present work fills this gap in knowledge by introducing the latest micro- and nanoengineered solutions for fabricating substrate and conductive components. Here, the limitations and improvements in electrical, optical, and mechanical properties, the stability and longevity of the integrated features, and biocompatibility during in vivo use are discussed.
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Affiliation(s)
- Z. Fekete
- Research Group for Implantable Microsystems, Faculty of Information Technology & Bionics, Pázmány Péter Catholic University, Budapest, Hungary
- Institute of Cognitive Neuroscience & Psychology, Eotvos Lorand Research Network, Budapest, Hungary
| | - A. Zátonyi
- Research Group for Implantable Microsystems, Faculty of Information Technology & Bionics, Pázmány Péter Catholic University, Budapest, Hungary
| | - A. Kaszás
- Mines Saint-Etienne, Centre CMP, Département BEL, F - 13541 Gardanne, France
- Institut de Neurosciences de la Timone, CNRS UMR 7289 & Aix-Marseille Université, 13005 Marseille, France
| | - M. Madarász
- János Szentágothai PhD Program of Semmelweis University, Budapest, Hungary
- BrainVision Center, Budapest, Hungary
| | - A. Slézia
- Institut de Neurosciences de la Timone, CNRS UMR 7289 & Aix-Marseille Université, 13005 Marseille, France
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7
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Kapetanaki SM, Fekete Z, Dorlet P, Vos MH, Liebl U, Lukacs A. Molecular insights into the role of heme in the transcriptional regulatory system AppA/PpsR. Biophys J 2022; 121:2135-2151. [PMID: 35488435 DOI: 10.1016/j.bpj.2022.04.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 03/07/2022] [Accepted: 04/26/2022] [Indexed: 11/30/2022] Open
Abstract
Heme has been shown to have a crucial role in the signal transduction mechanism of the facultative photoheterotrophic bacterium Rhodobacter sphaeroides. It interacts with the transcriptional regulatory complex AppA/PpsR in which AppA and PpsR function as the antirepressor and repressor, respectively of photosynthesis gene expression. The mechanism, however of this interaction remains incompletely understood. In this study, we combined EPR spectroscopy and FRET to demonstrate the ligation of heme in PpsR with a proposed cysteine residue. We show that heme binding in AppA affects the fluorescent properties of the dark-adapted state of the protein, suggesting a less constrained flavin environment compared to the absence of heme and the light-adapted state. We performed ultrafast transient absorption measurements in order to reveal potential differences in the dynamic processes in the full-length AppA and its heme-binding domain alone. Comparison of the CO-binding dynamics demonstrates a more open heme pocket in the holo-protein, qualitatively similar to what has been observed in the CO sensor RcoM-2, and suggests a communication path between the BLUF and SCHIC domains of AppA. We have also examined quantitatively, the affinity of PpsR to bind to individual DNA fragments of the puc promoter using fluorescence anisotropy assays. We conclude that oligomerization of PpsR is initially triggered by binding of one of the two DNA fragments and observe a ∼10-fold increase in the dissociation constant Kd for DNA binding upon heme binding to PpsR. Our study provides significant new insight at the molecular level on the regulatory role of heme that modulates the complex transcriptional regulation in R. sphaeroides and supports the two levels of heme signaling, via its binding to AppA and PpsR and via the sensing of gases like oxygen.
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Affiliation(s)
- Sofia M Kapetanaki
- Department of Biophysics, Medical School, University of Pécs, 7624 Pécs, Hungary; Szentagothai Research Center, University of Pecs, 7624 Pécs, Hungary.
| | - Zsuzsanna Fekete
- Department of Biophysics, Medical School, University of Pécs, 7624 Pécs, Hungary
| | - Pierre Dorlet
- Aix Marseille Univ, CNRS, BIP, IMM, Marseille, France
| | - Marten H Vos
- LOB, CNRS, INSERM, Ecole Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau Cedex, France
| | - Ursula Liebl
- LOB, CNRS, INSERM, Ecole Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau Cedex, France
| | - Andras Lukacs
- Department of Biophysics, Medical School, University of Pécs, 7624 Pécs, Hungary; Szentagothai Research Center, University of Pecs, 7624 Pécs, Hungary.
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8
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Telek E, Karadi K, Kardos J, Kengyel A, Fekete Z, Halasz H, Nyitrai M, Bugyi B, Lukacs A. Conformational dynamics and functional characterization of the C-terminal tail of Myosin 16. Biophys J 2022. [DOI: 10.1016/j.bpj.2021.11.1831] [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: 11/28/2022] Open
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9
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Fedor FZ, Paraczky C, Ravasz L, Tóth K, Borhegyi Z, Somogyvári Z, Juhász G, Fekete Z. Electrophysiological and behavioral properties of 4-aminopyridine-induced epileptic activity in mice. Biol Futur 2021; 71:427-434. [PMID: 34554464 DOI: 10.1007/s42977-020-00047-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 06/03/2020] [Accepted: 09/14/2020] [Indexed: 10/23/2022]
Abstract
4-aminopyridine (4-AP) is a widely used drug that induces seizure activity in rodents, especially in rats, although there is no consensus in the literature on the dose to be used in mice. The aim of the present study was to investigate the effect of the intraperitoneal administration of 4-AP in two doses (4 and 10 mg/kg) in vivo. EEG, movement, and video recordings were made simultaneously in male B6 mice to specify the details of the seizures and to determine whether there is a suitable non-lethal dose for seizure induction and for further molecular studies. Seizure behavior in mice differs from that seen in rats, with no characteristic stages of epileptic seizures, but with spiking and seizure activity. Seizure activity, although produced at both doses without being lethal, induced different changes of the EEG pattern. Smaller dose induced a lower amplitude seizure activity, decreased spiking activity and later onset of seizures, while higher dose induced a much more intense brain seizure activity and severe trembling. It is concluded that the intraperitoneal administration of 4-AP at a dose of 10 mg/kg induces explicit seizure activity in mice which is repeatable and can be suitable for further molecular research.
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Affiliation(s)
- F Z Fedor
- Doctoral School of Chemical Engineering and Material Sciences, University of Pannonia, Veszprém, 8200, Hungary. .,ELTE NAP Neuroimmunology Research Group, Department of Biochemistry, Institute of Biology, Eötvös Loránd University, Budapest, 1117, Hungary.
| | - C Paraczky
- Institute of Experimental Medicine, Budapest, 1083, Hungary
| | - L Ravasz
- ELTE NAP Neuroimmunology Research Group, Department of Biochemistry, Institute of Biology, Eötvös Loránd University, Budapest, 1117, Hungary
| | - K Tóth
- Laboratory of Molecular Neuroendocrinology, Institute of Experimental Medicine, 1083, Budapest, Hungary
| | - Z Borhegyi
- Department of Biochemistry, Eötvös Loránd University, Budapest, 1117, Hungary
| | - Z Somogyvári
- Theoretical Neuroscience and Complex Systems Research Group, Department of Computational Sciences, Wigner Research Centre for Physics, Budapest, 1121, Hungary
| | - G Juhász
- Department of Biochemistry, Eötvös Loránd University, Budapest, 1117, Hungary
| | - Z Fekete
- Research Group for Implantable Microsystems, Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Budapest, 1083, Hungary.,Centre for Energy Research, Budapest, 1121, Hungary
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10
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Csernyus B, Szabó Á, Fiáth R, Zátonyi A, Lázár C, Pongrácz A, Fekete Z. A multimodal, implantable sensor array and measurement system to investigate the suppression of focal epileptic seizure using hypothermia. J Neural Eng 2021; 18. [PMID: 34280911 DOI: 10.1088/1741-2552/ac15e6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 03/25/2021] [Accepted: 07/19/2021] [Indexed: 11/12/2022]
Abstract
Objective.Local cooling of the brain as a therapeutic intervention is a promising alternative for patients with epilepsy who do not respond to medication.In vitroandin vivostudies have demonstrated the seizure-suppressing effect of local cooling in various animal models. In our work, focal brain cooling in a bicuculline induced epilepsy model in rats is demonstrated and evaluated using a multimodal micro-electrocorticography (microECoG) device.Approach.We designed and experimentally tested a novel polyimide-based sensor array capable of recording microECoG and temperature signals concurrently from the cortical surface of rats. The effect of cortical cooling after seizure onset was evaluated using 32 electrophysiological sites and eight temperature sensing elements covering the brain hemisphere, where injection of the epileptic drug was performed. The focal cooling of the cortex right above the injection site was accomplished using a miniaturized Peltier chip combined with a heat pipe to transfer heat. Control of cooling and collection of sensor data was provided by a custom designed Arduino based electronic board. We tested the experimental setup using an agar gel modelin vitro, and thenin vivoin Wistar rats.Main results.Spatial variation of temperature during the Peltier controlled cooling was evaluated through calibrated, on-chip platinum temperature sensors. We found that frequency of epileptic discharges was not substantially reduced by cooling the cortical surface to 30 °C, but was suppressed efficiently at temperature values around 20 °C. The multimodal array revealed that seizure-like ictal events far from the focus and not exposed to high drop in temperature can be also inhibited at an extent like the directly cooled area.Significance.Our results imply that not only the absolute drop in temperature determines the efficacy of seizure suppression, and distant cortical areas not directly cooled can be influenced.
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Affiliation(s)
- B Csernyus
- Research Group for Implantable Microsystems, Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Budapest, Hungary
| | - Á Szabó
- Research Group for Implantable Microsystems, Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Budapest, Hungary.,Roska Tamás Interdisciplinary Doctoral School, Pázmány Péter Catholic University, Budapest, Hungary
| | - R Fiáth
- Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Budapest, Hungary
| | - A Zátonyi
- Research Group for Implantable Microsystems, Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Budapest, Hungary
| | - C Lázár
- Microsystems Laboratory, Institute of Technical Physics and Material Sciences, Center for Energy Research, Budapest, Hungary
| | - A Pongrácz
- Research Group for Implantable Microsystems, Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Budapest, Hungary
| | - Z Fekete
- Research Group for Implantable Microsystems, Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Budapest, Hungary
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11
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Telek E, Karádi K, Kardos J, Kengyel A, Fekete Z, Halász H, Nyitrai M, Bugyi B, Lukács A. The C-terminal tail extension of myosin 16 acts as a molten globule, including intrinsically disordered regions, and interacts with the N-terminal ankyrin. J Biol Chem 2021; 297:100716. [PMID: 33930467 PMCID: PMC8253979 DOI: 10.1016/j.jbc.2021.100716] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 04/19/2021] [Accepted: 04/26/2021] [Indexed: 11/20/2022] Open
Abstract
The lesser-known unconventional myosin 16 protein is essential in proper neuronal functioning and has been implicated in cell cycle regulation. Its longer Myo16b isoform contains a C-terminal tail extension (Myo16Tail), which has been shown to play a role in the neuronal phosphoinositide 3-kinase signaling pathway. Myo16Tail mediates the actin cytoskeleton remodeling, downregulates the actin dynamics at the postsynaptic site of dendritic spines, and is involved in the organization of the presynaptic axon terminals. However, the functional and structural features of this C-terminal tail extension are not well known. Here, we report the purification and biophysical characterization of the Myo16Tail by bioinformatics, fluorescence spectroscopy, and CD. Our results revealed that the Myo16Tail is functionally active and interacts with the N-terminal ankyrin domain of myosin 16, suggesting an intramolecular binding between the C and N termini of Myo16 as an autoregulatory mechanism involving backfolding of the motor domain. In addition, the Myo16Tail possesses high structural flexibility and a solvent-exposed hydrophobic core, indicating the largely unstructured, intrinsically disordered nature of this protein region. Some secondary structure elements were also observed, indicating that the Myo16Tail likely adopts a molten globule-like structure. These structural features imply that the Myo16Tail may function as a flexible display site particularly relevant in post-translational modifications, regulatory functions such as backfolding, and phosphoinositide 3-kinase signaling.
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Affiliation(s)
- Elek Telek
- Department of Biophysics, Medical School, University of Pécs, Pécs, Hungary; MTA-PTE Nuclear-Mitochondrial Interactions Research Group, Pécs, Hungary
| | - Kristóf Karádi
- Department of Biophysics, Medical School, University of Pécs, Pécs, Hungary; Szentágothai Research Center, Pécs, Hungary
| | - József Kardos
- Department of Biochemistry, Institute of Biology, Eötvös Loránd University, Budapest, Hungary
| | - András Kengyel
- Department of Biophysics, Medical School, University of Pécs, Pécs, Hungary; MTA-PTE Nuclear-Mitochondrial Interactions Research Group, Pécs, Hungary; Szentágothai Research Center, Pécs, Hungary
| | - Zsuzsanna Fekete
- Department of Biophysics, Medical School, University of Pécs, Pécs, Hungary
| | - Henriett Halász
- Department of Biophysics, Medical School, University of Pécs, Pécs, Hungary; MTA-PTE Nuclear-Mitochondrial Interactions Research Group, Pécs, Hungary
| | - Miklós Nyitrai
- Department of Biophysics, Medical School, University of Pécs, Pécs, Hungary; MTA-PTE Nuclear-Mitochondrial Interactions Research Group, Pécs, Hungary; Szentágothai Research Center, Pécs, Hungary
| | - Beáta Bugyi
- Department of Biophysics, Medical School, University of Pécs, Pécs, Hungary; Szentágothai Research Center, Pécs, Hungary.
| | - András Lukács
- Department of Biophysics, Medical School, University of Pécs, Pécs, Hungary; MTA-PTE Nuclear-Mitochondrial Interactions Research Group, Pécs, Hungary; Szentágothai Research Center, Pécs, Hungary.
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12
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Pirisi K, Nag L, Fekete Z, Iuliano JN, Tolentino Collado J, Clark IP, Pécsi I, Sournia P, Liebl U, Greetham GM, Tonge PJ, Meech SR, Vos MH, Lukacs A. Identification of the vibrational marker of tyrosine cation radical using ultrafast transient infrared spectroscopy of flavoprotein systems. Photochem Photobiol Sci 2021; 20:369-378. [PMID: 33721272 DOI: 10.1007/s43630-021-00024-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 02/09/2021] [Indexed: 11/29/2022]
Abstract
Tryptophan and tyrosine radical intermediates play crucial roles in many biological charge transfer processes. Particularly in flavoprotein photochemistry, short-lived reaction intermediates can be studied by the complementary techniques of ultrafast visible and infrared spectroscopy. The spectral properties of tryptophan radical are well established, and the formation of neutral tyrosine radicals has been observed in many biological processes. However, only recently, the formation of a cation tyrosine radical was observed by transient visible spectroscopy in a few systems. Here, we assigned the infrared vibrational markers of the cationic and neutral tyrosine radical at 1483 and 1502 cm-1 (in deuterated buffer), respectively, in a variant of the bacterial methyl transferase TrmFO, and in the native glucose oxidase. In addition, we studied a mutant of AppABLUF blue-light sensor domain from Rhodobacter sphaeroides in which only a direct formation of the neutral radical was observed. Our studies highlight the exquisite sensitivity of transient infrared spectroscopy to low concentrations of specific radicals.
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Affiliation(s)
- Katalin Pirisi
- Department of Biophysics, Medical School, University of Pecs, Szigeti Str. 12, 7624, Pecs, Hungary
| | - Lipsa Nag
- Laboratoire d'Optique et Biosciences, CNRS, INSERM, Ecole Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France
| | - Zsuzsanna Fekete
- Department of Biophysics, Medical School, University of Pecs, Szigeti Str. 12, 7624, Pecs, Hungary
| | - James N Iuliano
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794-3400, USA
| | | | - Ian P Clark
- Central Laser Facility, Research Complex at Harwell, Harwell Science and Innovation Campus, Didcot, OX11 0QX, Oxon, UK
| | - Ildikó Pécsi
- Department of Biophysics, Medical School, University of Pecs, Szigeti Str. 12, 7624, Pecs, Hungary
| | - Pierre Sournia
- Laboratoire d'Optique et Biosciences, CNRS, INSERM, Ecole Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France
| | - Ursula Liebl
- Laboratoire d'Optique et Biosciences, CNRS, INSERM, Ecole Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France
| | - Gregory M Greetham
- Central Laser Facility, Research Complex at Harwell, Harwell Science and Innovation Campus, Didcot, OX11 0QX, Oxon, UK
| | - Peter J Tonge
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794-3400, USA
| | - Stephen R Meech
- School of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UK
| | - Marten H Vos
- Laboratoire d'Optique et Biosciences, CNRS, INSERM, Ecole Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France.
| | - Andras Lukacs
- Department of Biophysics, Medical School, University of Pecs, Szigeti Str. 12, 7624, Pecs, Hungary.
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13
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Fedor FZ, Zátonyi A, Cserpán D, Somogyvári Z, Borhegyi Z, Juhász G, Fekete Z. Application of a flexible polymer microECoG array to map functional coherence in schizophrenia model. MethodsX 2020; 7:101117. [PMID: 33194564 PMCID: PMC7644754 DOI: 10.1016/j.mex.2020.101117] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 10/19/2020] [Indexed: 02/03/2023] Open
Abstract
Anatomically, connections form the fundamental brain network, functionally the different types of oscillatory electric activities are creating a temporarily connected fraction of the anatomical connectome generating an output to the motor system. Schizophrenia can be considered as a connectome disease, in which the sensory input generates a schizophrenia specific temporary connectome and the signal processing becomes diseased showing hallucinations and adverse behavioral reactions. In this work, flexible, 32-channel polymer microelectrode arrays fabricated by the authors are used to map the functional coherence on large cortical areas during physiological activities in a schizophrenia model in rats.-Fabrication of a flexible microECoG array is shown.-Protocol to use a flexible microECoG is demonstrated to characterize connectome diseases in rats.-Customized method to analyze the functional coherence between different cortical areas during visually evoked potential is detailed.-R-based implementation of the analysis method is presented.
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Affiliation(s)
- F Z Fedor
- Doctoral School of Chemical Engineering and Material Sciences, Pannon University, Veszprém, Hungary.,ELTE NAP Neuroimmunology Research Group, Department of Biochemistry, Institute of Biology, Eötvös Loránd University, Budapest, Hungary.,Research Group for Implantable Microsystems, Faculty of Information Technology & Bionics, Pázmány Péter Catholic University, Budapest, Hungary
| | - A Zátonyi
- ELTE NAP Neuroimmunology Research Group, Department of Biochemistry, Institute of Biology, Eötvös Loránd University, Budapest, Hungary.,Centre for Energy Research, Hungarian Academy of Sciences, Budapest, Hungary.,Research Group for Implantable Microsystems, Faculty of Information Technology & Bionics, Pázmány Péter Catholic University, Budapest, Hungary
| | - D Cserpán
- Theoretical Neuroscience and Complex Systems Research Group, Department of Computational Sciences, Wigner Research Centre for Physics, Budapest, Hungary
| | - Z Somogyvári
- Theoretical Neuroscience and Complex Systems Research Group, Department of Computational Sciences, Wigner Research Centre for Physics, Budapest, Hungary
| | - Z Borhegyi
- Department of Biochemistry, Eötvös Loránd University, Budapest, Hungary
| | - G Juhász
- Department of Biochemistry, Eötvös Loránd University, Budapest, Hungary
| | - Z Fekete
- Centre for Energy Research, Hungarian Academy of Sciences, Budapest, Hungary.,Research Group for Implantable Microsystems, Faculty of Information Technology & Bionics, Pázmány Péter Catholic University, Budapest, Hungary
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14
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Abstract
Infrared neuromodulation (INM) is a branch of photobiomodulation that offers direct or indirect control of cellular activity through elevation of temperature in a spatially confined region of the target tissue. Research on INM started about 15 ago and is gradually attracting the attention of the neuroscience community, as numerous experimental studies have provided firm evidence on the safe and reproducible excitation and inhibition of neuronal firing in both in vitro and in vivo conditions. However, its biophysical mechanism is not fully understood and several engineered interfaces have been created to investigate infrared stimulation in both the peripheral and central nervous system. In this review, recent applications and present knowledge on the effects of INM on cellular activity are summarized, and an overview of the technical approaches to deliver infrared light to cells and to interrogate the optically evoked response is provided. The micro- and nanoengineered interfaces used to investigate the influence of INM are described in detail.
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Affiliation(s)
- Z Fekete
- Research Group for Implantable Microsystems, Faculty of Information Technology & Bionics, Pázmány Péter Catholic University, Budapest 1083, Hungary. Author to whom any correspondence should be addressed
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15
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Zátonyi A, Madarász M, Szabó Á, Lőrincz T, Hodován R, Rózsa B, Fekete Z. Transparent, low-autofluorescence microECoG device for simultaneous Ca2+imaging and cortical electrophysiologyin vivo. J Neural Eng 2020; 17:016062. [DOI: 10.1088/1741-2552/ab603f] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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16
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Karadi K, Kapetanaki SM, Raics K, Pecsi I, Kapronczai R, Fekete Z, Iuliano JN, Collado JT, Gil AA, Orban J, Nyitrai M, Greetham GM, Vos MH, Tonge PJ, Meech SR, Lukacs A. Functional dynamics of a single tryptophan residue in a BLUF protein revealed by fluorescence spectroscopy. Sci Rep 2020; 10:2061. [PMID: 32029866 PMCID: PMC7005313 DOI: 10.1038/s41598-020-59073-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 01/23/2020] [Indexed: 11/17/2022] Open
Abstract
Blue Light Using Flavin (BLUF) domains are increasingly being adopted for use in optogenetic constructs. Despite this, much remains to be resolved on the mechanism of their activation. The advent of unnatural amino acid mutagenesis opens up a new toolbox for the study of protein structural dynamics. The tryptophan analogue, 7-aza-Trp (7AW) was incorporated in the BLUF domain of the Activation of Photopigment and pucA (AppA) photoreceptor in order to investigate the functional dynamics of the crucial W104 residue during photoactivation of the protein. The 7-aza modification to Trp makes selective excitation possible using 310 nm excitation and 380 nm emission, separating the signals of interest from other Trp and Tyr residues. We used Förster energy transfer (FRET) between 7AW and the flavin to estimate the distance between Trp and flavin in both the light- and dark-adapted states in solution. Nanosecond fluorescence anisotropy decay and picosecond fluorescence lifetime measurements for the flavin revealed a rather dynamic picture for the tryptophan residue. In the dark-adapted state, the major population of W104 is pointing away from the flavin and can move freely, in contrast to previous results reported in the literature. Upon blue-light excitation, the dominant tryptophan population is reorganized, moves closer to the flavin occupying a rigidly bound state participating in the hydrogen-bond network around the flavin molecule.
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Affiliation(s)
- Kristof Karadi
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary.,Szentagothai Research Center, University of Pécs, 7624, Pécs, Hungary
| | - Sofia M Kapetanaki
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary.,Szentagothai Research Center, University of Pécs, 7624, Pécs, Hungary
| | - Katalin Raics
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary
| | - Ildiko Pecsi
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary
| | - Robert Kapronczai
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary
| | - Zsuzsanna Fekete
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary
| | - James N Iuliano
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794-3400, USA
| | | | - Agnieszka A Gil
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794-3400, USA
| | - Jozsef Orban
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary
| | - Miklos Nyitrai
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary.,Szentagothai Research Center, University of Pécs, 7624, Pécs, Hungary
| | - Greg M Greetham
- Central Laser Facility, Harwell Science and Innovation Campus, Didcot, Oxfordshire, UK
| | - Marten H Vos
- LOB, CNRS, INSERM, Ecole Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, Cedex, France
| | - Peter J Tonge
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794-3400, USA
| | - Stephen R Meech
- School of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UK
| | - Andras Lukacs
- Department of Biophysics, Medical School, University of Pécs, 7624, Pécs, Hungary. .,Szentagothai Research Center, University of Pécs, 7624, Pécs, Hungary.
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17
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Körmendy L, Zsarnóczay G, Cattaneo P, Cantoni C, Consiglteri C, Casagrande G, Savio G, Wenzel S, Kühne M, Bálint G, Pactheco E, Gaugecz J, Gimesi A, Herman A, Fekete Z, Juhász S, Szentgyörgyi M, Major-Földi K, Szabó AS, Simon A, Farkas J. Modified Acid Phosphatase Assay for Assessing the Extent of Heating of Canned Picnics and Hams: Interlaboratory Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/78.5.1205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Determination of acid phosphatase (E.C. 3.1.3.2.) activity in meat and meat products Is based on spectrophotometric measurement of free phenol released from phenyl phosphate substrate during enzyme catalysis under prescribed conditions. Precision parameters of a new modified phosphatase assay, proposed for determination of extent of heating of canned picnics and hams, were evaluated in an interlaboratory study with 10 (1 German, 2 Italian, and 7 Hungarian) participating laboratories. The test materials were 5 lean meat batters subjected to different heat treatments (i.e., with different levels of phosphatase activity). The materials were presented to participants as 10 randomly coded samples (2 blind replicates of each material). The interlaboratory study was then repeated with 3 test materials and 2 blind replicates (3 × 2) prepared in the same way. The repeatability relative standard deviation (RSDr), outliers excluded, varied from 2.2 to 10.7%, and the reproducibility relative standard deviation (RSDR) varied from 12.6 to 25.3%. Results were compared with other data in the literature. The sensitivity of the new modified phosphatase assay was also compared with that of the original procedure described in USDA Chemistry Laboratory Guidebook. A higher sensitivity was observed for the method described in this paper. However, the method’s reproducibility was poorer than that of common analytical methods. Although high, the variability may still be acceptable for determining phosphatase activity to assess extent of heat treatment of canned picnics and hams.
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Affiliation(s)
- L Körmendy
- Hungarian Meat Research Institute, Gubacsi ut 6/b, 1097 Budapest, Hungary
| | | | - Patrizia Cattaneo
- Istituto di Ispezione degli Alimenti di Origine Animale Pietro Stazzi, Via Celoria, 10,20133 Milano, Italy
| | - C Cantoni
- Istituto di Ispezione degli Alimenti di Origine Animale Pietro Stazzi, Via Celoria, 10,20133 Milano, Italy
| | - C Consiglteri
- Università degli Studi, Facoltà di Economia e Commercio, Istituto di Merceologia, Via J.F. Kennedy 6,43100 Parma, and Via dell’Artigliere 1,37129 Verona, Italy
| | - G Casagrande
- Università degli Studi, Facoltà di Economia e Commercio, Istituto di Merceologia, Via J.F. Kennedy 6,43100 Parma, and Via dell’Artigliere 1,37129 Verona, Italy
| | - G Savio
- Università degli Studi, Facoltà di Economia e Commercio, Istituto di Merceologia, Via J.F. Kennedy 6,43100 Parma, and Via dell’Artigliere 1,37129 Verona, Italy
| | - S Wenzel
- Institut für Lebensmittelkunde, Fleischhygiene und Technologie, Tierärtzliche Hochschule, Bischofsholer Damm 15, 30173 Hannover, Germany
| | - M Kühne
- Institut für Lebensmittelkunde, Fleischhygiene und Technologie, Tierärtzliche Hochschule, Bischofsholer Damm 15, 30173 Hannover, Germany
| | - Georgtna Bálint
- Meat Packing Plant of Szekszárd, Keselyüsi ut 24,7100 Szekszárd, Hungary
| | - Ertka Pactheco
- Meat Packing Plant of Szekszárd, Keselyüsi ut 24,7100 Szekszárd, Hungary
| | - Janka Gaugecz
- Technical University of Budapest, Department of Biochemistry and Food Technology, Müegyetem rkp 3, 1111 Budapest, Hungary
| | - Andrea Gimesi
- Technical University of Budapest, Department of Biochemistry and Food Technology, Müegyetem rkp 3, 1111 Budapest, Hungary
| | - Andrea Herman
- National Food Investigation Institute, Mester ut 81,1095 Budapest, Hungary
| | - Z Fekete
- National Food Investigation Institute, Mester ut 81,1095 Budapest, Hungary
| | - S Juhász
- Veterinary and Food Control Station, Lehel ut 47,1135 Budapest, Hungary
| | | | - Kamtlla Major-Földi
- University of Horticulture and Food Industry, Department of Food Chemistry and Nutrition, Somlói ut 14–16, 1118 Budapest, Hungary
| | - A S Szabó
- University of Horticulture and Food Industry, Department of Food Chemistry and Nutrition, Somlói ut 14–16, 1118 Budapest, Hungary
| | - Anna Simon
- University of Horticulture and Food Industry, Department of Refrigeration and Livestock Products Technology, Ménesi ut 44, 1118 Budapest, Hungary
| | - J Farkas
- University of Horticulture and Food Industry, Department of Refrigeration and Livestock Products Technology, Ménesi ut 44, 1118 Budapest, Hungary
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18
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Boruzs K, Fekete Z, Dombrádi V, Bányai G, Nagy A, Horne R, Bíró K. Beliefs About Medicines: Differences in cholesterol treatment adherence among the Visegrad countries. Eur J Public Health 2019. [DOI: 10.1093/eurpub/ckz187.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Raised cholesterol is a risk factor for cerebrovascular and cardiovascular diseases. New cholesterol guidelines highlight more personalized risk assessments and new cholesterol-lowering drugs for people at the highest risk for cardiovascular disease.
Methods
The aim of our study was to investigate the possible differences in the beliefs about the necessity and concerns regarding lipid-lowering drugs among the Visegrad Group countries. For this the Beliefs About Medicines Questionnaire (BMQ-Specific) was used. The statistical analyses included 235 Czech, 205 Hungarian, 200 Polish, and 200 Slovak respondents, all of who were taking cholesterol lowering drugs.
Results
After comparing the answers of the citizens of the Visegrad Group countries, no statistically significant difference could be found regarding the concerns about the lipid-lowering drugs. However, related to the beliefs in necessity, a significant difference was shown between Poland and Hungary for the benefit of Polish participants. These results suggest, that the citizens of Visegrad Group countries do not differ regarding their beliefs about the fear of the treatment, while the beliefs about benefits are the most emphasized among the Polish citizens and less among the Hungarian citizens.
Conclusions
While policy makers in the Visegrad Group countries can use the same strategy to address the concerns regarding cholesterol lowering medication, the reasons behind the difference in the beliefs in necessity should be further investigated in order to implement country specific interventions.
The research was funded by the GINOP-2.3.2-15-2016-00005 project which is co-financed by
the European Union under the European Regional Development Fund.
Key messages
No differences exist regarding the concerns for cholesterol lowering medication among the Visegrad Group countries. Concerning necessity significant differences were observed among the same countries, which prompts further research questions.
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Affiliation(s)
- K Boruzs
- Department of Health Systems Management and Quality Management in Health Care, University of Debrecen, Debrecen, Hungary
| | - Z Fekete
- Institute of Behavioral Sciences, University of Debrecen, Debrecen, Hungary
| | - V Dombrádi
- Department of Health Systems Management and Quality Management in Health Care, University of Debrecen, Debrecen, Hungary
| | - G Bányai
- Department of Health Systems Management and Quality Management in Health Care, University of Debrecen, Debrecen, Hungary
| | - A Nagy
- Department of Preventive Medicine, University of Debrecen, Debrecen, Hungary
| | - R Horne
- UCL School of Pharmacy, University College London, London, UK
| | - K Bíró
- Department of Health Systems Management and Quality Management in Health Care, University of Debrecen, Debrecen, Hungary
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19
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Boros ÖC, Horváth ÁC, Beleznai S, Sepsi Ö, Csősz D, Fekete Z, Koppa P. Optimization of an optrode microdevice for infrared neural stimulation. Appl Opt 2019; 58:3870-3876. [PMID: 31158202 DOI: 10.1364/ao.58.003870] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 04/15/2019] [Indexed: 06/09/2023]
Abstract
Infrared light is a promising candidate for the treatment of neurodegenerative diseases. Optimizing the device parameters to achieve the best optical and mechanical performance is essential for reliable in vivo operation. In this work, mechanical strength simulations and coupled optical and thermal model were used to determine optimal design parameters for maximizing overall device efficiency. Our analysis reveals that minimizing the number of integrated optical elements and optimizing the optical path leads to a 33% relative in-coupling efficiency improvement at equal mechanical robustness. Using a symmetric optrode tip with an angle of 15°, the efficiency showed a further 17% relative improvement due to the enhancement of out-coupling at the tip. To investigate the temperature rise of the brain tissue during the infrared stimulation in the case of the optimized device, a thermal simulation with pulsed infrared excitation was developed. Our results show that the optimized device provides a temperature rise of 4.42°C as opposed to 3°C for the original setup.
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Chirila M, Eniu D, Todor N, Nagy V, Galatir M, Coza D, Cernea V, Martin D, Fekete Z. Outcomes and prognostic factors for angiosarcoma: A 19-year single institution experience. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy299.049] [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: 11/13/2022] Open
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Bérces Z, Pomothy J, Horváth ÁC, Kőhidi T, Benyei É, Fekete Z, Madarász E, Pongrácz A. Effect of nanostructures on anchoring stem cell-derived neural tissue to artificial surfaces. J Neural Eng 2018; 15:056030. [DOI: 10.1088/1741-2552/aad972] [Citation(s) in RCA: 9] [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: 01/02/2023]
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Boros ÖC, Horváth ÁC, Beleznai S, Sepsi Ö, Lenk S, Fekete Z, Koppa P. Optical and thermal modeling of an optrode microdevice for infrared neural stimulation. Appl Opt 2018; 57:6952-6957. [PMID: 30129582 DOI: 10.1364/ao.57.006952] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Accepted: 07/16/2018] [Indexed: 06/08/2023]
Abstract
Infrared neural stimulation is a promising medical technique using pulsed infrared light for generating temperature-controlled firing of neurons. A combined optical and thermal model of a stimulating microtool-or so-called optrode-has been developed to investigate the amount, the spatial distribution, and the temporal behavior of the thermal excitation. Ray tracing and Fourier optics were used to describe the propagation and scattering of light in the optrode, and the finite element method was applied to model heat transfer. The scattered intensity distribution profiles were calculated based on measured surface roughness of the device and were integrated into the ray optics model. As a validation of the optical model, the simulated and measured values of the light efficiency of the microoptical system are compared. The temperature rise of the brain tissue during the infrared stimulation was estimated using the combined model. Using 30 mW total power and a single 100 ms pulse, the excitation resulted in a temperature rise of 3°C of the brain tissue. The spatial and temporal distributions of the tissue temperature are discussed in the paper. The proposed combined model is an efficient tool for the investigation and optimization of the stimulation process and for further development of the optrode configuration.
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Zátonyi A, Fedor F, Borhegyi Z, Fekete Z. In vitro and in vivo stability of black-platinum coatings on flexible, polymer microECoG arrays. J Neural Eng 2018; 15:054003. [DOI: 10.1088/1741-2552/aacf71] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Nordanstig A, Rosengren L, Strömberg S, Österberg K, Karlsson L, Bergström G, Fekete Z, Jood K. Editor's Choice - Very Urgent Carotid Endarterectomy is Associated with an Increased Procedural Risk: The Carotid Alarm Study. Eur J Vasc Endovasc Surg 2017; 54:278-286. [PMID: 28755855 DOI: 10.1016/j.ejvs.2017.06.017] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [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: 01/30/2017] [Accepted: 06/23/2017] [Indexed: 12/31/2022]
Abstract
OBJECTIVE/BACKGROUND The aim of the Carotid Alarm Study was to compare the procedural risk of carotid endarterectomy (CEA) performed within 48 hours with that after 48 hours to 14 days following an ipsilateral cerebrovascular ischaemic event. METHODS Consecutive patients with symptomatic carotid stenosis undergoing CEA were prospectively recruited. Time to surgery was calculated as time from the most recent ischaemic event preceding surgery. A neurologist examined patients before and, after CEA. The primary endpoint was the composite endpoint of death and/or any stroke within 30 days of the surgical procedure. The study was designed to include 600 patients, with 150 operated on within 48 hours. RESULTS From October 2010 to December 2015, 418 patients were included, of whom 75 were operated within 48 hours of an ischaemic event. The study was prematurely terminated owing to the slow recruitment rate in the group operated on within 48 hours. Patients undergoing CEA within 48 hours had a higher risk of reaching the primary endpoint than those operated on later (8.0% vs. 2.9%). Multivariate logistic regression analyses showed that CEA performed within 48 h (odds ratio [OR] 3.07; 95% confidence interval [CI] 1.04-9.09), CEA performed out of office hours (OR 3.65; 95% CI 1.14-11.67), and use of shunt (OR 4.02; 95% CI 1.36-11.93) were all independently associated with an increased risk of reaching the primary endpoint. CONCLUSION CEA performed within 48 hours was associated with a higher risk of complications compared with surgery performed 48 hours-14 days after the most recent ischaemic event.
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Affiliation(s)
- A Nordanstig
- Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, The Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden; Department of Neurology, Sahlgrenska University Hospital, Gothenburg, Sweden.
| | - L Rosengren
- Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, The Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden; Department of Neurology, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - S Strömberg
- Institute of Clinical Science, The Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - K Österberg
- Institute of Clinical Science, The Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - L Karlsson
- The Sahlgrenska Centre for Cardiovascular and Metabolic Research, Wallenberg Laboratory, Institute of Medicine, The Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden
| | - G Bergström
- The Sahlgrenska Centre for Cardiovascular and Metabolic Research, Wallenberg Laboratory, Institute of Medicine, The Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden
| | - Z Fekete
- Department of Neurology and Rehabilitation, Södra Älvsborg Hospital, Borås, Sweden
| | - K Jood
- Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, The Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden; Department of Neurology, Sahlgrenska University Hospital, Gothenburg, Sweden
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Fekete Z, Csernai M, Kocsis K, Horváth ÁC, Pongrácz A, Barthó P. Simultaneousin vivorecording of local brain temperature and electrophysiological signals with a novel neural probe. J Neural Eng 2017; 14:034001. [DOI: 10.1088/1741-2552/aa60b1] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Kozinszky Z, Devosa I, Fekete Z, Szabó D, Sikovanyecz J, Pásztor N, Keresztúri A. Knowledge of Emergency Contraceptive Pills among Hungarian Women Presenting for Induced Abortion or Seeking Emergency Contraception. Geburtshilfe Frauenheilkd 2016; 76:978-982. [PMID: 27681523 DOI: 10.1055/s-0042-105746] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Aim: To compare the differences in contraceptive characteristics and the knowledge of emergency contraception (ECP) among women who used ECP after unprotected intercourse and those who sought an abortion. Methods: A questionnaire survey was conducted in a Hungarian university hospital among women for whom ECP was prescribed after unprotected intercourse (n = 940) as well as women who presented for the termination of pregnancy (n = 1592) between January 1, 2005 and November 20, 2006. Their knowledge of ECP and their experience with and attitudes toward ECP use were targeted. Results: The availability of ECP was well known (87.9 %), but it was still greatly underutilized: applied by only 13 of the 1592 women who resorted to abortion. Primarily, the ECP group consisted of those who experienced a condom failure significantly more often (odds ratio [OR] = 4.1), followed by those cases where ECP applications was a consequence of not using any kind of contraception (OR = 3.8). Fewer than one third (32 %) of the abortion seekers had previously used ECP, and only one fifth knew how to obtain it. Appropriate awareness of ECP was influenced by information obtained from health-care providers (adjusted odds ratio [AOR] = 3.93) or school education (AOR = 1.82). Conclusions: More thorough education is needed to provide a deeper knowledge of ECP use during contraceptive counseling for women seeking abortion, including those contraceptive mishaps where unintended pregnancy can be prevented by ECP.
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Affiliation(s)
- Z Kozinszky
- Department of Obstetrics and Gynecology, Blekinge Hospital, Karlskrona, Sweden
| | - I Devosa
- College of Kecskemét, Teacher Training Faculty, Health Science and Health Promotion Research Group, Hungary, Kecskemét, Hungary
| | - Z Fekete
- Department of Obstetrics and Gynaecology, University of Szeged, Szeged, Hungary
| | - D Szabó
- Department of Obstetrics and Gynaecology, University of Szeged, Szeged, Hungary
| | - J Sikovanyecz
- Department of Obstetrics and Gynaecology, University of Szeged, Szeged, Hungary
| | - N Pásztor
- Department of Obstetrics and Gynaecology, University of Szeged, Szeged, Hungary
| | - A Keresztúri
- Department of Obstetrics and Gynaecology, University of Szeged, Szeged, Hungary
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Márton G, Baracskay P, Cseri B, Plósz B, Juhász G, Fekete Z, Pongrácz A. A silicon-based microelectrode array with a microdrive for monitoring brainstem regions of freely moving rats. J Neural Eng 2016; 13:026025. [PMID: 26924827 DOI: 10.1088/1741-2560/13/2/026025] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
OBJECTIVE Exploring neural activity behind synchronization and time locking in brain circuits is one of the most important tasks in neuroscience. Our goal was to design and characterize a microelectrode array (MEA) system specifically for obtaining in vivo extracellular recordings from three deep-brain areas of freely moving rats, simultaneously. The target areas, the deep mesencephalic reticular-, pedunculopontine tegmental-and pontine reticular nuclei are related to the regulation of sleep-wake cycles. APPROACH The three targeted nuclei are collinear, therefore a single-shank MEA was designed in order to contact them. The silicon-based device was equipped with 3 × 4 recording sites, located according to the geometry of the brain regions. Furthermore, a microdrive was developed to allow fine actuation and post-implantation relocation of the probe. The probe was attached to a rigid printed circuit board, which was fastened to the microdrive. A flexible cable was designed in order to provide not only electronic connection between the probe and the amplifier system, but sufficient freedom for the movements of the probe as well. MAIN RESULTS The microdrive was stable enough to allow precise electrode targeting into the tissue via a single track. The microelectrodes on the probe were suitable for recording neural activity from the three targeted brainstem areas. SIGNIFICANCE The system offers a robust solution to provide long-term interface between an array of precisely defined microelectrodes and deep-brain areas of a behaving rodent. The microdrive allowed us to fine-tune the probe location and easily scan through the regions of interest.
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Affiliation(s)
- G Márton
- Comparative Psychophysiology Department, Institute of Cognitive Neuroscience and Physiology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 2 Magyar Tudósok Blvd., H-1117, Budapest, Hungary. MEMS Laboratory, Institute for Technical Physics and Materials Science, Centre for Energy Research, Hungarian Academy of Sciences, 29-33 Konkoly Thege Miklós st., H-1121, Budapest, Hungary
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Miseta A, Nagy J, Nagy T, Poór VS, Fekete Z, Sipos K. Hepcidin and its potential clinical utility. Cell Biol Int 2015; 39:1191-202. [PMID: 26109250 DOI: 10.1002/cbin.10505] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [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: 02/27/2015] [Accepted: 06/12/2015] [Indexed: 02/06/2023]
Abstract
A number of pathophysiological conditions are related to iron metabolism disturbances. Some of them are well known, others are newly discovered or special. Hepcidin is a newly identified iron metabolism regulating hormone, which could be a promising biomarker for many disorders. In this review, we provide background information about mammalian iron metabolism, cellular iron trafficking, and the regulation of expression of hepcidin. Beside these molecular biological processes, we summarize the methods that have been used to determine blood and urine hepcidin levels and present those pathological conditions (cancer, inflammation, neurological disorders) when hepcidin measurement may have clinical relevance.
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Affiliation(s)
- Attila Miseta
- Department of Laboratory Medicine, Faculty of Medical Sciences, University of Pécs, 7624 Ifjusag Street 13. Pecs, Hungary
| | - Judit Nagy
- Department of Anaesthesiology and Intensive Care, Faculty of Medical Sciences, University of Pécs, 7624 Ifjusag Street 13. Pecs, Hungary
| | - Tamas Nagy
- Department of Laboratory Medicine, Faculty of Medical Sciences, University of Pécs, 7624 Ifjusag Street 13. Pecs, Hungary
| | - Viktor Soma Poór
- Department of Forensic Medicine, Faculty of Medical Sciences, University of Pécs, 7624 Szigeti Street 12. Pecs, Hungary
| | - Zsuzsanna Fekete
- Department of Medical Biology, Faculty of Medical Sciences, University of Pécs, 7624 Szigeti Street 12. Pecs, Hungary
| | - Katalin Sipos
- Department of Pharmaceutical Biology, Faculty of Medical Sciences, University of Pécs, 7624 Rokus Street 2. Pecs, Hungary
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Fekete Z, Vass E, Kancsev A. Theoretical Background and Treatment of Social Cognitive Impairment in Schizophrenia- What is Known and What is Needed? Eur Psychiatry 2015. [DOI: 10.1016/s0924-9338(15)32092-7] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Fekete Z, Németh A, Márton G, Ulbert I, Pongrácz A. Experimental study on the mechanical interaction between silicon neural microprobes and rat dura mater during insertion. J Mater Sci Mater Med 2015; 26:70. [PMID: 25631267 DOI: 10.1007/s10856-015-5401-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Accepted: 10/26/2014] [Indexed: 05/06/2023]
Abstract
In vivo insertion experiments are essential to optimize novel neural implants. Our work focuses on the interaction between intact dura mater of rats and as-fabricated single-shaft silicon microprobes realized by deep reactive ion etching. Implantation parameters like penetration force and dimpling through intact dura mater were studied as a function of insertion speed, microprobe cross-section, tip angle and animal age. To reduce tissue resistance, we proposed a unique tip sharpening technique, which was also evaluated in in vivo insertion tests. By doubling the insertion speed (between 1.2 and 10.5 mm/min), an increase of 10-35% in penetration forces was measured. When decreasing the cross-section of the microprobes, penetration forces and dimpling was reduced by as much as 30-50% at constant insertion speeds. Force was noticed to gradually decrease by decreasing tip angles. Measured penetration forces through dura mater were reduced even down to 11±3 mN compared to unsharpened (49±13 mN) probes by utilizing our unique tip sharpening technique, which is very close to exerted penetration force in the case of retracted dura (5±1.5 mN). Our findings imply that age remarkably alters the elasticity of intact dura mater. The decreasing stiffness of dura mater results in a significant rise in penetration force and decrease in dimpling. Our work is the first in vivo comparative study on microelectrode penetration through intact and retracted dura mater.
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Affiliation(s)
- Z Fekete
- MEMS Lab, Institute for Technical Physics & Material Science, RCNS, HAS, P.O.Box 49, Budapest, 1525, Hungary,
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Deák M, Bocskai M, Burcsár S, Dányi O, Fekete Z, Kovács L. Non-thromboembolic risk in systemic lupus erythematosus associated with antiphospholipid syndrome. Lupus 2014; 23:913-8. [DOI: 10.1177/0961203314531839] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Accepted: 03/25/2014] [Indexed: 02/04/2023]
Abstract
Objectives We investigated the impact of secondary antiphospholipid syndrome (APS) and antiphospholipid antibody (aPL) positivity on the non-thromboembolic clinical manifestations of systemic lupus erythematosus (SLE). Methods In total, 224 patients with SLE were studied, of whom 105 were aPL-positive; 52 fulfilled the criteria for APS. SLE- and APS-related clinical and laboratory features were assesed: SLE patients with aPL or APS were compared with those without these features. Results Not only thromboembolic events, but also Coombs-positive haemolytic anaemia, thrombocytopenia and endocarditis occurred significantly more frequently in the aPL-positive than in the aPL-negative patients. In the APS + SLE subgroup, several non-thromboembolic symptoms occurred more often than in the absence of APS: pleuritis, interstitial lung disease, myocarditis, nephritis and organic brain syndrome. The mean number of major organ manifestations (1.2 vs. 0.5) and the overall number of organ manifestations (8.1 vs. 6.9) were higher in the APS + SLE patients than in those without APS ( p < 0.05). The APS + SLE subgroup more frequently required intensive immunosuppressive treatment than did the APS-negative patients ( p < 0.05). Conclusions SLE patients with aPL positivity or secondary APS also have a higher risk to develop non-thromboembolic disease manifestations in addition to the aPL-related symptoms, and are predisposed to more severe SLE manifestations.
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Affiliation(s)
- M Deák
- Department of Rheumatology, University of Szeged, Faculty of Medicine, Albert Szent-Györgyi Health Centre, Szeged, Hungary
| | - M Bocskai
- Department of Rheumatology, University of Szeged, Faculty of Medicine, Albert Szent-Györgyi Health Centre, Szeged, Hungary
| | - S Burcsár
- Department of Rheumatology, University of Szeged, Faculty of Medicine, Albert Szent-Györgyi Health Centre, Szeged, Hungary
| | - O Dányi
- Department of Rheumatology, University of Szeged, Faculty of Medicine, Albert Szent-Györgyi Health Centre, Szeged, Hungary
| | - Z Fekete
- Department of Rheumatology, University of Szeged, Faculty of Medicine, Albert Szent-Györgyi Health Centre, Szeged, Hungary
| | - L Kovács
- Department of Rheumatology, University of Szeged, Faculty of Medicine, Albert Szent-Györgyi Health Centre, Szeged, Hungary
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Fekete Z, Muntean A, Irimie A, Hica S, Resiga L, Todor N, Nagy V. What is the significance of a microscopically positive resection margin in the curative-intent treatment of rectal adenocarcinoma? A retrospective study. J BUON 2013; 18:989-995. [PMID: 24344028] [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] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
PURPOSE The aim of this study was to analyze the characteristics of patients with rectal cancer operated with a microscopic positive margin (R1) and thus avoid these situations or adapt treatment in these particular cases. METHODS We reviewed all the pathology data of resected specimens from patients with rectal or recto-sigmoid cancer operated with curative intent at the Institute of Oncology "Prof. Dr. Ion Chiricuta" between 2000-2011 (763 patients in 12 years) and the pathology files of patients from other institutions referred for adjuvant treatment to our hospital (318 patients). We included patients with anterior resection, Hartmann's procedure and abdomino-perineal resection, but we excluded patients with local excision and patients with R2/R1 at first, but R0 after re-resection (56 patients). We have identified 31 patients with R1, but had to exclude one case from analysis because this patient was lost to follow-up. RESULTS With surgery alone the local relapse (LR) was unavoidable. In the neoadjuvant chemoradiation (CRT) group 85.7% of the patients did not develop LR despite of R1. In the adjuvant CRT cohort 50% of the patients were LR-free at 2 years after conventional radiotherapy (p<0.01). CONCLUSION Based on these results it is concluded that a clear resection margin is extremely important for the local control of rectal cancer, because it cannot be always compensated by adjuvant CRT. In R1 cases neoadjuvant CRT seems to offer better prognosis than adjuvant CRT. To avoid R1 and its consequences a good quality control of total mesorectal excision (TME) is needed and CRT should be done before and not after surgery. R1 after primary surgery needs to be compensated by re-resection if possible, otherwise probably high dose radiotherapy with chemotherapy is needed.
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Affiliation(s)
- Z Fekete
- Iuliu Hatieganu University of Medicine and Pharmacy, Department of Oncology, Cluj-Napoca; Ion Chiricuta Institute of Oncology,Cluj-Napoca, Romania
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Deak M, Bocskai M, Burcsár S, Dányi O, Fekete Z, Kovács L. AB0410 Non-thromboembolic risk in sle associated antiphospholipid syndrome. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.2732] [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: 11/04/2022]
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Pongrácz A, Fekete Z, Marton G, Fiáth R, Fürjes P, Ulbert I, Battistig G. Deep-Brain Silicon Multielectrodes for Simultaneous Neural Recording and Drug Delivery. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.proeng.2012.09.138] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Fürjes P, Fekete Z, Illés L, Tóth A, Battistig G, Gyurcsányi R. Effects of the Focused Ion Beam Parameters on Nanopore Milling in Solid State Membranes. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.proeng.2012.09.239] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Fekete Z, Dordai D, Kacso G, Mocan C, Dordai E. 1030 poster LDR IODINE-125 BRACHYTHERAPY AS BOOST IN CURATIVE INTENT RADIOTHERAPY OF PROSTATE CANCER. Radiother Oncol 2011. [DOI: 10.1016/s0167-8140(11)71152-5] [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: 10/18/2022]
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Fekete Z, Nagy P, Pongrácz A, Bársony I, Fürjes P. Efficiency test on the experimental design of micromachined blood separation system based on Zweifach-Fung effect. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.proeng.2011.12.306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Mercer LK, Dixon WG, Watson KD, Galloway J, Lunt M, Symmons DP, Hyrich KL, Galloway J, Hyrich K, Mercer L, Dixon W, Ustianowski A, Watson K, Lunt M, Symmons D, Mirjafari H, Lunt M, Charlton-Menys V, Bunn D, Edlin H, Marshall T, Wilson P, Symmons DP, Bruce IN, Goodson NJ, Morgan K, Marks J, Symmons DP, Gullick N, Oakley S, Jones T, Mistlin A, Rees J, Gibson T, Panayi G, Kirkham B, Ma MH, Ibrahim F, Pollard L, Fekete Z, Kingsley GH, Scott DL. Concurrent Oral 7 - Rheumatoid Arthritis: Clinical Aspects [OP48-OP53]: OP48. The Risk of Non-Melanoma Skin Cancer in Patients Receiving Anti-TNF Therapies for Rheumatoid Athritis: Results from the British Society for Rheumatology Biologics Register. Rheumatology (Oxford) 2010. [DOI: 10.1093/rheumatology/keq707] [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: 11/14/2022] Open
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Keller K, Wolfová M, Wolf J, Fekete Z, Komlósi I, Szabó F. Der Einfluss des Kuhgewichts auf die Betriebsrentabilität und auf die ökonomischen Gewichte der Fleischrindmerkmale. Arch Anim Breed 2009. [DOI: 10.5194/aab-52-255-2009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Abstract. Title of paper: Impact of mature cow weight on farm profitability and economic weights of beef cattle traits The impact of mature cow weight on the profitability of beef cattle farming and on the economic importance of 10 performance and functional traits was analyzed. The examined traits were: calving performance, stillbirth and calf losses till weaning, weight of calves at birth, at 120 and at 205 days of age, mature weight of cows, conception rates of heifers and cows and productive lifetime of cows. The cow weight was varied from 500 to 700 kg in 50 kg intervals. The economic efficiency of all farming systems was expressed as profit per cow and year. The economic importance of a trait (marginal economic value) was defined as partial derivative of the profit function with respect to trait mean. The program package ECOWEIGHT was used for all calculations. The results showed that beef cattle farming with all cow weight classes could be profitable when including subsidies in the incomes of a farm. Without subsidies, a positive profitability can be reached only when keeping small-framed cows (500 to 550 kg). In all modelled production systems, the most important trait was conception rate of cows followed by weaning weight of calves (at 205 days of age) for light cows or productive lifetime of cows in systems with heavy cows.
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Kacso G, Fekete Z, Veresezan O, Todor N, Popescu S, Cebotaru C, Coman I, Ghilezan N. Long Term Results of Curative Intent Chemoradiation for Muscle Invading Bladder Cancer. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.1148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Kacsó G, Fekete Z. Adjuvant partial breast radiotherapy for early breast cancer--ready for a change? J BUON 2008; 13:169-175. [PMID: 18555461] [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] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Partial breast radiotherapy (PBRT) has recently gained an optional place as local adjuvant treatment after breast-conserving surgery (BCS) for selected early-stage breast cancer. With high-dose-rate (HDR) interstitial multicatheter brachytherapy (BT) performed under strict quality assurance criteria, there is level B evidence derived from one single randomized study with follow-up longer than 5 years and level C from several mature prospective non-randomized studies. For intra-lumpectomy cavity Mammosite HDR-BT and for external beam RT, as well as 3-dimensional (3D)-conformal or intra-operative therapy by electrons or photons, there is only level D evidence with no mature enough prospective data. Large phase III trials are ongoing for each PBRT technique, but their results might offer a level A evidence no earlier than 5 years.
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Affiliation(s)
- G Kacsó
- Department of Brachytherapy, Ion Chiricuta Cancer Center, 34-36 Gh. Bilascu Street, Cluj-Napoca, Romania.
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Fekete Z, Ellis TP, Schonauer MS, Dieckmann CL. Pet127 governs a 5' -> 3'-exonuclease important in maturation of apocytochrome b mRNA in Saccharomyces cerevisiae. J Biol Chem 2007; 283:3767-72. [PMID: 18086665 DOI: 10.1074/jbc.m709617200] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The details of mRNA maturation in Saccharomyces mitochondria are not well understood. All seven mRNAs are transcribed as part of multigenic units. The mRNAs are processed at a common 3'-dodecamer sequence, but the 5'-ends have seven different sequences. To investigate whether apocytochrome b (COB) mRNA is processed at the 5'-end from a longer precursor by an endonuclease or an exonuclease, a 64-nucleotide sequence, which is required for the protection of COB mRNA by the Cbp1 protein and is found at the 5'-end of the processed COB mRNA, was duplicated in tandem. The wild-type 64-nucleotide element functioned in either the upstream or downstream position when paired with a mutant element. In the tandem wild-type strain, the 5'-end of the mRNA was at the 5'-end of the upstream unit, demonstrating that the mRNA is processed by an exonuclease. Accumulation of precursor COB RNA in single and double element strains with a deletion of PET127 demonstrated that the encoded protein governs the 5'-exonuclease responsible for processing the precursor to the mature form.
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Affiliation(s)
- Zsuzsanna Fekete
- Department of Medical Biology, Medical School, University of Pécs, H-7624 Pécs, Hungary
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Reuter G, Meleg E, Kiss G, Albert N, Fekete Z, Szûcs G. Molecular detection of adenovirus type 8 epidemic keratoconjunctivitis in Hungary. Orv Hetil 2007; 148:1311-5. [PMID: 17611181 DOI: 10.1556/oh.2007.28076] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Bevezetés:
A heveny kötőhártya-gyulladás (conjunctivitis) fertőzéses és nem fertőzéses eredetű lehet. A fertőzéses eredetű járványos conjunctivitisek (conjunctivitis epidemica) kórokozói vírusok, ezen belül elsősorban az adenovírusok különböző típusai.
Célkitűzés:
A szerzők célja egy keratoconjunctivitis járvány epidemiológiai leírása volt a virális kórokozó molekuláris kimutatásával.
Módszer:
A járvány – részben retrospektív – felderítésében klasszikus járványügyi módszereket alkalmaztak. A laboratóriumi etiológiai vizsgálat az adenovírus hexon régiójának kimutatásával polimeráz láncreakcióval (PCR), majd szekvenálással történt frissen gyűjtött conjunctiva-váladékból.
Eredmények:
A keratoconjunctivitis járványban összesen 60-an betegedtek meg 2006. október 9. és december 18-a között hét baranyai településen. A betegek átlagéletkora 51,2 év volt. A vezető tünetek a conjunctiva belövelltsége (100%), a könnyezés (94%), az idegentest-érzés (83%) és a homályos látás (76%) voltak. Az esetek felében mindkét szem érintett volt. A fertőzés közvetlen kontaktussal terjedt részben nosocomiálisan, a szemészeti szakellátás során. Nyolc conjunctivaváladékból 5-ben (62,5%) genetikailag azonos, 8-as típusú adenovírust lehetett kimutatni (HAdV8/Baranya/2006/HUN; EF210714), mely 100%-ban azonos volt egy Ausztriában 2004-ben kimutatott adenovírussal (DQ149614).
Következtetések:
A részben a szemészeti ellátáshoz kapcsolódó nosocomiális keratoconjunctivitis-járványt az adenovírus 8-as típusa okozta. A megbetegedés klinikai felismerése, laboratóriumi diagnosztikája és a járványügyi intézkedések együttesen szükségesek a keratoconjunctivitis-fertőzések és a következményes járvány megelőzéséhez.
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MESH Headings
- Acute Disease
- Adenovirus Infections, Human/diagnosis
- Adenovirus Infections, Human/epidemiology
- Adenovirus Infections, Human/virology
- Adenoviruses, Human/genetics
- Adenoviruses, Human/isolation & purification
- Adult
- Aged
- Conjunctivitis, Viral/diagnosis
- Conjunctivitis, Viral/epidemiology
- Conjunctivitis, Viral/virology
- Cross Infection/diagnosis
- Cross Infection/epidemiology
- Cross Infection/virology
- DNA, Viral/isolation & purification
- Disease Outbreaks
- Female
- Humans
- Hungary/epidemiology
- Keratoconjunctivitis/diagnosis
- Keratoconjunctivitis/epidemiology
- Keratoconjunctivitis/virology
- Male
- Middle Aged
- Polymerase Chain Reaction
- Sequence Analysis, DNA
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Affiliation(s)
- Gábor Reuter
- Allami Népegészségügyi és Tisztiorvosi Szolgálat Baranya Megyei Intézete, Regionális Virológiai Laboratórium, Pécs, Hungary.
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Reuter G, Pankovics P, Stefler D, Löveyné Dr M, Varga E, Kiss G, Szucs M, Fekete Z, Szucs G. [Hepatitis A outbreak in Transdanubia (Hungary): molecular connections and epidemiological conclusions - 2006]. Orv Hetil 2007; 148:1023-31. [PMID: 17526446 DOI: 10.1556/oh.2007.28096] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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: 11/19/2022]
Abstract
INTRODUCTION Hepatitis A virus (HAV) is one of the most important cause of fecally transmitted acute infectious hepatitis worldwide. In Hungary, beside the sporadic HAV infections, outbreaks also occur, particularly in Northeast part of the country where the subgenotype IA is endemic. The reported number of HAV cases was less than 10 per year in Southwest Hungary. AIMS A part of the European HAV surveillance, the author's aims were to follow and to analyze the outbreak of hepatitis A in Transdanubia (Southwest Hungary) in 2006 by molecular epidemiological methods. MATERIALS AND METHODS Sera samples from symptomatic patients were tested prospectively by enzyme-immunoassay (EIA) and reverse transcription-polymerase chain reaction (RT-PCR) followed by sequence- and phylogenetic analysis. RESULTS Between June and December 2006, a total of 115 serum samples were positive for HAV IgM antibody in Southwest Hungary. Thirty (76.9%) of the 39 samples were RT-PCR-positive and contain genetically identical subgenotype IB hepatitis A virus (HAV/Transdanubia/2006/HUN) which has 100% nucleotide identity to strain IT-MAR-02 from Italy in 2002. Until now, approximately 1200-1300 persons have been infected with the probably imported strain. The average age of patients was 18 years (years 1 to 80). In this study, detailed clinical and epidemiological data of the outbreak are presented. CONCLUSIONS Only a prospective molecular epidemiological study could verify the connection between the first sporadic HAV cases in June, the outbreak in August and the endemic spread of the virus since September in Southwest Hungary. This epidemic calls attention to how a hepatitis A outbreak can develop anywhere and at any time in Hungary and to the importance of active HAV immunization in the primary prevention.
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Affiliation(s)
- Gábor Reuter
- Allami Népegészségügyi és Tisztiorvosi Szolgálat Baranya Megyei Intézete Regionális Virológiai Laboratórium Pécs.
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Reuter G, Juhász A, Kosztolányi L, Lefler E, Fekete Z. Co-circulation of genotype IA and new variant IB hepatitis A virus in outbreaks of acute hepatitis in Hungary—2003/2004. J Med Virol 2006; 78:1392-7. [PMID: 16998889 DOI: 10.1002/jmv.20710] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [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: 11/05/2022]
Abstract
Hepatitis A virus (HAV) is one of the most important causes of acute infectious hepatitis worldwide. In Hungary, the reported number of HAV infections has been decreasing in the last four decades, nevertheless, still, each year 500-800 new cases and multiple outbreaks occur, particularly in the northeast region of Hungary. In Hungary, serology is used routinely to establish the diagnosis of HAV infection without genetic analysis of HAV strains for molecular epidemiology. In this study, serum samples collected from symptomatic patients were tested by enzyme-immunoassay (anti-HAV-IgM ELISA) to establish the cause of three acute hepatitis A outbreaks (outbreak 1--from low prevalence region in Southwest Hungary in 2003 and outbreaks 2 and 3 from the endemic region in Northeast Hungary in 2004). Outbreak strains were characterized by reverse transcription-polymerase chain reaction (RT-PCR) amplification of a 360 bp viral VP1/2A region, amplicon sequencing and phylogenetic analysis. Four, seven, and three sera from outbreaks 1, 2, and 3, respectively, were investigated by RT-PCR for HAV genome and HAV RNA was detected in 4 (100%), 4 (57%), and 2 (67%) samples. All strains belonged to genotype I HAV. Outbreak 1 was caused by the new variant subtype IB and outbreaks 2 and 3 caused by genetically identical subtype IA strains. The Hungarian IA and IB hepatitis A viruses had the highest nucleotide identity, 98.4% and 99.0%, to IT-SCH-00 and IT-MAR-02 strains, respectively, detected in year 2000 and 2002 in Italy. Endemic subtype IA and probably imported new variant subtype IB HAV viruses was detected in outbreaks of hepatitis in Hungary that are closely related genetically to HAV strains in Italy.
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Affiliation(s)
- Gábor Reuter
- Regional Laboratory of Virology, Department of Epidemiology, ANTSZ Baranya County Institute of State Public Health Service, Pécs, Hungary.
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Krizbai IA, Lenzser G, Szatmari E, Farkas AE, Wilhelm I, Fekete Z, Erdos B, Bauer H, Bauer HC, Sandor P, Komjati K. BLOOD-BRAIN BARRIER CHANGES DURING COMPENSATED AND DECOMPENSATED HEMORRHAGIC SHOCK. Shock 2005; 24:428-33. [PMID: 16247328 DOI: 10.1097/01.shk.0000183389.98519.d3] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [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: 11/25/2022]
Abstract
Dysfunction of the blood-brain barrier (BBB) can be associated with a large number of central nervous system and systemic disorders. The aim of the present study was to determine BBB changes during different phases of hemorrhagic shock. The experiments were carried out on male Wistar rats anaesthetized with urethane. To produce compensated or decompensated hemorrhagic shock, mean arterial pressure was decreased from the normotensive control values to 40 mmHg by a standardized method of blood withdrawal from the femoral artery. Cerebral blood flow changes were followed by laser-Doppler flowmetry, and arterial blood gas values were monitored over the whole procedure. Cortical blood flow was significantly reduced in compensated and in decompensated hemorrhagic shock compared with the normotensive rats. As the shock shifted to the decompensated phase, the blood flow reduction was more pronounced. BBB permeability studies using sodium fluorescein (molecular weight of 376) and Evan's Blue albumin (molecular weight of 67,000) have revealed a significant increase of the BBB permeability for sodium fluorescein in the decompensated stage of hemorrhagic shock. Western blot analysis of brain capillaries showed that the expression of the transmembrane tight junction protein occludin was reduced in response to hemorrhagic shock, and the decrease of occludin was more pronounced in the decompensated phase. A similar expression pattern was shown by the transmembrane adherens junction protein cadherin as well. Our results suggest that the decompensated phase of hemorrhagic shock is associated with disturbances of the BBB, which may be explained by the dysfunction of interendothelial junctions caused by decreased occludin and cadherin levels.
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Affiliation(s)
- István A Krizbai
- Institute of Biophysics, Biological Research Center, 6726 Szeged, Hungary.
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Affiliation(s)
- Roland Lill
- Institut für Zytobiologie und Zytopathologie der Philipps-Universität Marburg, Robert-Koch-Str. 6, 35033 Marburg, Germany.
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Kispal G, Sipos K, Lange H, Fekete Z, Bedekovics T, Janáky T, Bassler J, Aguilar Netz DJ, Balk J, Rotte C, Lill R. Biogenesis of cytosolic ribosomes requires the essential iron-sulphur protein Rli1p and mitochondria. EMBO J 2005; 24:589-98. [PMID: 15660134 PMCID: PMC548650 DOI: 10.1038/sj.emboj.7600541] [Citation(s) in RCA: 191] [Impact Index Per Article: 10.1] [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: 04/29/2004] [Accepted: 12/08/2004] [Indexed: 11/09/2022] Open
Abstract
Mitochondria perform a central function in the biogenesis of cellular iron-sulphur (Fe/S) proteins. It is unknown to date why this biosynthetic pathway is indispensable for life, the more so as no essential mitochondrial Fe/S proteins are known. Here, we show that the soluble ATP-binding cassette (ABC) protein Rli1p carries N-terminal Fe/S clusters that require the mitochondrial and cytosolic Fe/S protein biogenesis machineries for assembly. Mutations in critical cysteine residues of Rli1p abolish association with Fe/S clusters and lead to loss of cell viability. Hence, the essential character of Fe/S clusters in Rli1p explains the indispensable character of mitochondria in eukaryotes. We further report that Rli1p is associated with ribosomes and with Hcr1p, a protein involved in rRNA processing and translation initiation. Depletion of Rli1p causes a nuclear export defect of the small and large ribosomal subunits and subsequently a translational arrest. Thus, ribosome biogenesis and function are intimately linked to the crucial role of mitochondria in the maturation of the essential Fe/S protein Rli1p.
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Affiliation(s)
- Gyula Kispal
- Institute of Biochemistry, University Medical School of Pecs, Hungary
- Institut für Zytobiologie und Zytopathologie der Philipps-Universität Marburg, Marburg, Germany
| | - Katalin Sipos
- Institute of Biochemistry, University Medical School of Pecs, Hungary
| | - Heike Lange
- Institut für Zytobiologie und Zytopathologie der Philipps-Universität Marburg, Marburg, Germany
| | - Zsuzsanna Fekete
- Institute of Biochemistry, University Medical School of Pecs, Hungary
| | - Tibor Bedekovics
- Institute of Biochemistry, University Medical School of Pecs, Hungary
| | - Tamás Janáky
- Department of Medical Chemistry, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | | | - Daili J Aguilar Netz
- Institut für Zytobiologie und Zytopathologie der Philipps-Universität Marburg, Marburg, Germany
| | - Janneke Balk
- Institut für Zytobiologie und Zytopathologie der Philipps-Universität Marburg, Marburg, Germany
| | - Carmen Rotte
- Institut für Zytobiologie und Zytopathologie der Philipps-Universität Marburg, Marburg, Germany
| | - Roland Lill
- Institut für Zytobiologie und Zytopathologie der Philipps-Universität Marburg, Marburg, Germany
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Buban T, Foldes L, Fekete Z, Rademacher W. Effectiveness of the resistance inducer prohexadione-Ca against fireblight in shoots of apple trees inoculated with Erwinia amylovora1. ACTA ACUST UNITED AC 2004. [DOI: 10.1111/j.1365-2338.2004.00762.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
Glutathione is the major protective agent against oxidative stress in Saccharomyces cerevisiae. Deletion of the GSH1 gene (strain Deltagsh1) encoding the enzyme that catalyzes the first step of glutathione biosynthesis leads to growth arrest, which can be relieved by either glutathione or reducing agents such as dithiothreitol. Because defects in the biosynthesis of cellular iron-sulfur (Fe/S) proteins are associated with increases in glutathione levels, we examined the consequences of glutathione depletion on this essential process. No significant defects were detected in the amounts, activities, and maturation of mitochondrial Fe/S proteins in glutathione-depleted Deltagsh1 cells. On the contrary, the maturation of extra-mitochondrial Fe/S proteins was decreased substantially. The defect was rectified neither by addition of dithiothreitol nor under anaerobic conditions excluding oxidative damage of Fe/S clusters. A double mutant in GSH1 and ATM1 encoding a mitochondrial ATP binding cassette (ABC) transporter involved in cytosolic Fe/S protein maturation is nonviable even in the presence of dithiothreitol. Similar to atm1 and other mutants defective in cytosolic Fe/S protein maturation, mitochondria from glutathione-depleted Deltagsh1 cells accumulated high amounts of iron. Together, our data demonstrate that glutathione, in addition to its protective role against oxidative damage, performs a novel and specific function in the maturation of cytosolic Fe/S proteins.
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Affiliation(s)
- Katalin Sipos
- Institute of Biochemistry, Medical Faculty, University of Pecs, Szigeti ut 12, 7624 Pecs, Hungary
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