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Kardos A, Kassa K, Nagy Z, Kis Z, Simkovits D, Som Z, Csakany L, Major T, Foldesi C. Pulmonary vein isolation for paroxysmal atrial fibrillation using high-power short duration radiofrequency or second-generation cryoballoon ablation. Europace 2021. [DOI: 10.1093/europace/euab116.248] [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: 11/13/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: None.
Background
Differences in the left atrial (LA) tissue loss can occur following different pulmonary vein isolation (PVI) techniques.
Purpose
Our prospective study compared the biomarker, the LA mechanical, and the electrophysiological findings as indicators of LA myocardial damage after a high-power short duration (HPSD) with contact force radiofrequency catheter and second-generation cryoballoon (CB2) ablation of paroxysmal atrial fibrillation (AF).
Methods :We enrolled 40 patients with paroxysmal AF [16 (40%) women, mean age = 55.9 ± 12.4 years] who underwent HPSD (n = 21) or CB2 (n = 19). Biomarker levels (hs-cTnT, CK-MB, hs-CRP, LDH) and the transport function of the LA by transthoracic echocardiography (TTE) were compared pre and post procedurally. High-density mapping (HDM) was performed in sinus rhythm using a multielectrode diagnostic catheter in each group to define isolated left atrial low voltage area (LVA; <0.2mV in bipolar voltage mapping). LA CT-angiography and HDM merge was used to calculate the post-PVI LVA and the LVA/LA surface ratio.
Results
Postablation hs-cTnT and hs-CRP levels were comparable in the ablation groups (HPSD: 1249 ± 469 and 9.53 ± 10.30 vs. CB2: 995 ± 280 and 12.36 ± 5.76, p = 0.065 and p = 0.732), while CK-MB and LDH levels were significantly higher following CB2 ablation (HPSD: 6.61 ± 2.62 and 349.9 ± 65.6 vs. CB2: 26.01 ± 6.88 and 451.6 ± 91.3, p < 0.001 and p < 0.001). The transport function of the LA did not change significantly by TTE after the procedure. Fractional Area Change at baseline and 3 months was 33.9 ± 13.8 and 33.5 ± 10.7 p = 0.9 in the HPSD group while 38.1 ± 8.6 and 35.3 ± 12.2 p = 0.9 in the CB2 group. LA Ejection Fraction measured in the two groups (before and 3-month post-procedure): HPSD: 51.2 ± 20.5% and 49.5 ± 14.7%, p = 0.9, CB2: 49.7 ± 15.5% and 50.7 ± 13.3%, p = 0.8). Ablation time was comparable in the two groups (HPSD: 1676 ± 570 sec, CB2: 1495 ± 494 sec, p = 0.279), while fluoroscopy time and radiation exposure were significantly higher in the CB2 group (HPSD: 5.62 ± 4.31 min and 232 ± 406 cGycm2, CB2: 13.65 ± 5.18 min and 1819 ± 1669 cGycm2, p <0.001 and p <0.001). The LVA/LA surface ratio were: HPSD group: 8.37 ± 6.42% and CB2 group: 13.58 ± 8.92% (p = 0.007). At 12-month follow-up, the success rate, defined as freedom from AF/atrial tachycardia without antiarrhythmic drug was 80.1% (HPSD) and 84.2% (CB2) respectively.
Conclusions
The LA scar tissue was significantly higher following CB2 ablation, but did not affect medium-term efficacy. However, tissue loss did not reduce the transport function of the LA.
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Affiliation(s)
- A Kardos
- "Gottsegen Gyorgy" National Institute of Cardiology, Budapest, Hungary
| | - K Kassa
- "Gottsegen Gyorgy" National Institute of Cardiology, Budapest, Hungary
| | - Z Nagy
- "Gottsegen Gyorgy" National Institute of Cardiology, Budapest, Hungary
| | - Z Kis
- "Gottsegen Gyorgy" National Institute of Cardiology, Budapest, Hungary
| | - D Simkovits
- "Gottsegen Gyorgy" National Institute of Cardiology, Budapest, Hungary
| | - Z Som
- "Gottsegen Gyorgy" National Institute of Cardiology, Budapest, Hungary
| | - L Csakany
- "Gottsegen Gyorgy" National Institute of Cardiology, Budapest, Hungary
| | - T Major
- "Gottsegen Gyorgy" National Institute of Cardiology, Budapest, Hungary
| | - C Foldesi
- "Gottsegen Gyorgy" National Institute of Cardiology, Budapest, Hungary
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Abstract
BACKGROUND Magnetic resonance imaging and computed tomography in patients with ventricular tachycardia (VT) after myocardial infarction (MI) helps to delineate scar from healthy tissue. Image-guided VT ablation has not yet been studied on a large scale. OBJECTIVE The aim of the meta-analysis was to compare the long-term outcome of image-guided VT ablation with a conventional approach for VT after MI. METHODS Eight electronic bibliographic databases were searched to identify all relevant studies from 2012 until 2018. The search for scientific literature was performed for studies that described the outcome of VT ablation in patients with an ischaemic substrate. The outcome of image-guided ablation was compared with the outcome of conventional ablations. RESULTS Of the 2990 citations reviewed for eligibility, 38 articles-enrolling a total of 7748 patients-were included into the meta-analysis. Five articles included patients with image-guided ablation. VT-free survival was 82% [74-90] in the image-guided VT ablation versus 59% [54-64] in the conventional ablation group (p < 0.001) during a mean follow-up of 35 months. Overall survival was 94% [90-98] in the image-guided versus 82% [76-88] in the conventional VT ablation group (p < 0.001). CONCLUSIONS Image-guided VT ablation in ischaemic VT was associated with a significant benefit in VT-free and overall survival as compared with conventional VT ablation. Visualising myocardial scar facilitates substrate-guided ablation procedures, pre-procedurally and by integrating imaging during the procedure, and may consequently improve long-term outcome.
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Affiliation(s)
- A A Hendriks
- Department of Electrophysiology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Z Kis
- Department of Electrophysiology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - M Glisic
- Department of Epidemiology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - W M Bramer
- Medical Library, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - T Szili-Torok
- Department of Electrophysiology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands.
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Hendriks AA, Kis Z, Glisic M, Bramer WM, Szili-Torok T. P291Imaging guided versus non imaging guided ventricular tachycardia ablation - a meta-analysis. Europace 2018. [DOI: 10.1093/europace/euy015.103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- A A Hendriks
- Erasmus Medical Center, electrophysiology, Rotterdam, Netherlands
| | - Z Kis
- Erasmus Medical Center, electrophysiology, Rotterdam, Netherlands
| | - M Glisic
- Erasmus Medical Center, Department of Epidemiology, Rotterdam, Netherlands
| | - W M Bramer
- Erasmus Medical Center, Medical library, Rotterdam, Netherlands
| | - T Szili-Torok
- Erasmus Medical Center, electrophysiology, Rotterdam, Netherlands
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Nagy Z, Kis Z, Som Z, Geczy T, Foldesi C, Temesvari A, Kardos A. P898One year incidence of iatrogenic atrial septal defect after radiofrequency or cryoballoon ablation for paroxysmal atrial fibrillation. Europace 2018. [DOI: 10.1093/europace/euy015.499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Z Nagy
- Gottsegen Gyorgy Hungarian Institute of Cardiology, Budapest, Hungary
| | - Z Kis
- Erasmus Medical Center, Rotterdam, Netherlands
| | - Z Som
- Gottsegen Gyorgy Hungarian Institute of Cardiology, Budapest, Hungary
| | - T Geczy
- Erasmus Medical Center, Rotterdam, Netherlands
| | - C Foldesi
- Gottsegen Gyorgy Hungarian Institute of Cardiology, Budapest, Hungary
| | - A Temesvari
- Gottsegen Gyorgy Hungarian Institute of Cardiology, Budapest, Hungary
| | - A Kardos
- Gottsegen Gyorgy Hungarian Institute of Cardiology, Budapest, Hungary
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Nagy Z, Kis Z, Molnar D, Som Z, Foldesi C, Kardos A. P352Myocardial injury biomarkers and outcomes after pulmonary vein isolation using contact force sensing radiofrequency catheter or advanced cryoballoon. Europace 2018. [DOI: 10.1093/europace/euy015.163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Z Nagy
- Gottsegen Gyorgy Hungarian Institute of Cardiology, Budapest, Hungary
| | - Z Kis
- Erasmus Medical Center, Rotterdam, Netherlands
| | - D Molnar
- Semmelweis University, Budapest, Hungary
| | - Z Som
- Gottsegen Gyorgy Hungarian Institute of Cardiology, Budapest, Hungary
| | - C Foldesi
- Gottsegen Gyorgy Hungarian Institute of Cardiology, Budapest, Hungary
| | - A Kardos
- Gottsegen Gyorgy Hungarian Institute of Cardiology, Budapest, Hungary
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Noten AME, Kis Z, Akca F, Bhagwandien R, Wijchers S, Yap SC, Szili-Torok T. P758Evolution of efficiency of the first and second generation ablation techniques for atrial fibrillation: comparison of cryoballoon, manual and remote magnetic navigation guided radiofrequency ablation. Europace 2018. [DOI: 10.1093/europace/euy015.363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- AME Noten
- Erasmus Medical Center, Rotterdam, Netherlands
| | - Z Kis
- Erasmus Medical Center, Rotterdam, Netherlands
| | - F Akca
- Erasmus Medical Center, Rotterdam, Netherlands
| | | | - S Wijchers
- Erasmus Medical Center, Rotterdam, Netherlands
| | - S C Yap
- Erasmus Medical Center, Rotterdam, Netherlands
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Som Z, Nacsev K, Nagy Z, Kis Z, Kardos A, Foldesi C. P1108Comparison of the efficacy of cryoballoon and complex point-by-point left atrial radiofrequency catheter ablation in patients with persistent atrial fibrillation during two year follow-up. Europace 2018. [DOI: 10.1093/europace/euy015.594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Z Som
- Hungarian Institute of Cardiology, Budapest, Hungary
| | - K Nacsev
- Semmelweis University, Faculty of Medicine, Budapest, Hungary
| | - Z Nagy
- Hungarian Institute of Cardiology, Budapest, Hungary
| | - Z Kis
- Erasmus Medical Center, Rotterdam, Netherlands
| | - A Kardos
- Hungarian Institute of Cardiology, Budapest, Hungary
| | - C Foldesi
- Hungarian Institute of Cardiology, Budapest, Hungary
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Nagy Z, Kis Z, Som Z, Foldesi C, Kardos A. P841Four-year follow-up after contact force sensing radiofrequency catheter and second-generation cryoballoon ablation for paroxysmal atrial fibrillation. Europace 2018. [DOI: 10.1093/europace/euy015.444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Z Nagy
- Gottsegen Gyorgy Hungarian Institute of Cardiology, Budapest, Hungary
| | - Z Kis
- Erasmus Medical Center, Rotterdam, Netherlands
| | - Z Som
- Gottsegen Gyorgy Hungarian Institute of Cardiology, Budapest, Hungary
| | - C Foldesi
- Gottsegen Gyorgy Hungarian Institute of Cardiology, Budapest, Hungary
| | - A Kardos
- Gottsegen Gyorgy Hungarian Institute of Cardiology, Budapest, Hungary
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Hendriks AA, Theuns DA, Kis Z, Yap SC, Wijchers SA, Bhagwandien RE, Szili-Torok T. P304Conservative treatment fails to improve outcome of patient with electrical storm: a comparative study with catheter ablation. Europace 2018. [DOI: 10.1093/europace/euy015.116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- A A Hendriks
- Erasmus Medical Center, electrophysiology, Rotterdam, Netherlands
| | - D A Theuns
- Erasmus Medical Center, electrophysiology, Rotterdam, Netherlands
| | - Z Kis
- Erasmus Medical Center, electrophysiology, Rotterdam, Netherlands
| | - S C Yap
- Erasmus Medical Center, electrophysiology, Rotterdam, Netherlands
| | - S A Wijchers
- Erasmus Medical Center, electrophysiology, Rotterdam, Netherlands
| | - R E Bhagwandien
- Erasmus Medical Center, electrophysiology, Rotterdam, Netherlands
| | - T Szili-Torok
- Erasmus Medical Center, electrophysiology, Rotterdam, Netherlands
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Kis Z, Martirosyan M, Geczy T, Szili-Torok T. P3604High cerebrovascular thromboembolic rate after unsuccessful catheter ablation for atrial fibrillation. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p3604] [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: 11/15/2022] Open
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Hendriks AA, Kis Z, Bramer WM, Szili-Torok T. P483Long-term outcome of scar related ventricular tachycardia ablation guided by imaging integration. Europace 2017. [DOI: 10.1093/ehjci/eux141.206] [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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Martirosyan M, Kis Z, Geczy T, Szili-Torok T. P1421Comparison of long-term thromboembolic complication rate between patients after successful and unsuccessful catheter ablation for atrial fibrillation. Europace 2017. [DOI: 10.1093/ehjci/eux158.049] [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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Som Z, Nacsev K, Nagy Z, Kis Z, Breuer T, Kardos A, Foldesi C. P370Comparison of the efficacy of cryoballoon and complex point-by-point left atrial radiofrekvency catheter ablation in patients with persistent atrial fibrillation during one year follow-up. Europace 2017. [DOI: 10.1093/ehjci/eux141.096] [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: 11/12/2022] Open
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Hendriks AA, Kis Z, Akca F, Yap SC, Wijchers SA, Bhagwandien RE, Szili-Torok T. P392Extensive scar de-channelization in the atria, an alternative for the treatment of intra-atrial re-entrant tachycardia in patients after congenital heart surgery. Europace 2017. [DOI: 10.1093/ehjci/eux141.117] [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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Nagy Z, Kis Z, Som Z, Geczy T, Foldesi C, Temesvari A, Kardos A. P365Persistent iatrogenic atrial septal defect after radiofrequency or cryoballoon ablation for paroxysmal atrial fibrillation. Europace 2017. [DOI: 10.1093/ehjci/eux141.091] [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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Varga DP, Menyhárt Á, Puskás T, Bari F, Farkas E, Kis Z, Vécsei L, Toldi J, Gellért L. Systemic administration of l-kynurenine sulfate induces cerebral hypoperfusion transients in adult C57Bl/6 mice. Microvasc Res 2017; 114:19-25. [PMID: 28546077 DOI: 10.1016/j.mvr.2017.05.006] [Citation(s) in RCA: 5] [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: 02/26/2017] [Revised: 05/18/2017] [Accepted: 05/20/2017] [Indexed: 12/28/2022]
Abstract
The kynurenine pathway is a cascade of enzymatic steps generating biologically active compounds. l-kynurenine (l-KYN) is a central metabolite of tryptophan degradation. In the mammalian brain, l-KYN is partly converted to kynurenic acid (KYNA), which exerts multiple effects on neurotransmission. Recently, l-KYN or one of its derivatives were attributed a direct role in the regulation of the systemic circulation. l-KYN dilates arterial blood vessels during sepsis in rats, while it increases cerebral blood flow (CBF) in awake rabbits. Therefore, we hypothesized that acute elevation of systemic l-KYN concentration may exert potential effects on mean arterial blood pressure (MABP) and on resting CBF in the mouse brain. C57Bl/6 male mice were anesthetized with isoflurane, and MABP was monitored in the femoral artery, while CBF was assessed through the intact parietal bone with the aid of laser speckle contrast imaging. l-KYN sulfate (l-KYNs) (300mg/kg, i.p.) or vehicle was administered intraperitoneally. Subsequently, MABP and CBF were continuously monitored for 2.5h. In the control group, MABP and CBF were stable (69±4mmHg and 100±5%, respectively) throughout the entire data acquisition period. In the l-KYNs-treated group, MABP was similar to that, of control group (73±6mmHg), while hypoperfusion transients of 22±6%, lasting 7±3min occurred in the cerebral cortex over the first 60-120min following drug administration. In conclusion, the systemic high-dose of l-KYNs treatment destabilizes resting CBF by inducing a number of transient hypoperfusion events. This observation indicates the careful consideration of the dose of l-KYN administration by interpreting the effect of kynurenergic manipulation on brain function. By planning clinical trials basing on kynurenergic manipulation possible vascular side effects should also be considered.
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Affiliation(s)
- Dániel Péter Varga
- Department of Physiology, Anatomy and Neuroscience, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary; Department of Medical Physics and Informatics, Faculty of Medicine & Faculty of Science and Informatics, University of Szeged, Korányi fasor 9, H-6720 Szeged, Hungary
| | - Ákos Menyhárt
- Department of Medical Physics and Informatics, Faculty of Medicine & Faculty of Science and Informatics, University of Szeged, Korányi fasor 9, H-6720 Szeged, Hungary
| | - Tamás Puskás
- Department of Medical Physics and Informatics, Faculty of Medicine & Faculty of Science and Informatics, University of Szeged, Korányi fasor 9, H-6720 Szeged, Hungary
| | - Ferenc Bari
- Department of Medical Physics and Informatics, Faculty of Medicine & Faculty of Science and Informatics, University of Szeged, Korányi fasor 9, H-6720 Szeged, Hungary
| | - Eszter Farkas
- Department of Medical Physics and Informatics, Faculty of Medicine & Faculty of Science and Informatics, University of Szeged, Korányi fasor 9, H-6720 Szeged, Hungary
| | - Zsolt Kis
- Department of Physiology, Anatomy and Neuroscience, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary
| | - László Vécsei
- Department of Neurology, Faculty of Medicine, University of Szeged, Semmelweis utca 6, H-6725 Szeged, Hungary; MTA-SZTE Neuroscience Research Group, University of Szeged, Szeged, Hungary
| | - József Toldi
- Department of Physiology, Anatomy and Neuroscience, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary; MTA-SZTE Neuroscience Research Group, University of Szeged, Szeged, Hungary
| | - Levente Gellért
- Department of Physiology, Anatomy and Neuroscience, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary; MTA-SZTE Neuroscience Research Group, University of Szeged, Szeged, Hungary.
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Kornilov N, Hambsch FJ, Fabry I, Oberstedt S, Belgya T, Kis Z, Szentmiklosi L, Simakov S. The235U(n,f) Prompt Fission Neutron Spectrum at 100 K Input Neutron Energy. NUCL SCI ENG 2017. [DOI: 10.13182/nse09-25] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- N. Kornilov
- Ohio University, Department of Physics and Astronomy Clippinger Labs, Athens, Ohio 45701
| | - F.-J. Hambsch
- EC-JRC-Institute for Reference Materials and Measurements Retieseweg 111, B-2440 Geel, Belgium
| | - I. Fabry
- EC-JRC-Institute for Reference Materials and Measurements Retieseweg 111, B-2440 Geel, Belgium
| | - S. Oberstedt
- EC-JRC-Institute for Reference Materials and Measurements Retieseweg 111, B-2440 Geel, Belgium
| | - T. Belgya
- Institute of Isotopes of the Hungarian Academy of Sciences Department of Nuclear Research, Budapest, Hungary
| | - Z. Kis
- Institute of Isotopes of the Hungarian Academy of Sciences Department of Nuclear Research, Budapest, Hungary
| | - L. Szentmiklosi
- Institute of Isotopes of the Hungarian Academy of Sciences Department of Nuclear Research, Budapest, Hungary
| | - S. Simakov
- Forschungszentrum Karlsruhe, Institut für Neutronenphysik und Reaktortechnik D-76344 Eggenstein-Leopoldshafen, Germany
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Zboray R, Adams R, Kis Z. Fast neutron radiography and tomography at a 10MW research reactor beamline. Appl Radiat Isot 2016; 119:43-50. [PMID: 27842231 DOI: 10.1016/j.apradiso.2016.10.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 10/21/2016] [Accepted: 10/22/2016] [Indexed: 11/19/2022]
Abstract
Fast neutron imaging was performed using a beamline of the 10MW research reactor of the Budapest Neutron Centre, Hungary. A simple, low-cost 2D area detector has been used featuring a 8mm thick BC400 plastic scintillator converter screen and a CCD camera. A spatial resolution of around 1.3mm has been achieved. Typically 10min long exposures were needed to obtain reasonable quality radiographic images. For tomographic imaging typically several hours of acquisition were needed to obtain reasonable quality on non-symmetric and larger (e.g. 10×10×10cm3) objects. Due to the presence of a significant gamma background at the experimental position, massive (30cm thick) lead shielding and filtering was applied to the beam. The gamma contribution was mostly baseline independent of the object imaged and therefore could be subtracted, whereas the direct gamma contribution from the beam to the imaging detector signal is estimated to be less than 1%.
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Affiliation(s)
- R Zboray
- Paul Scherrer Institute, PSI Villigen CH-5232, Switzerland.
| | - R Adams
- Swiss Federal Institute of Technology Zurich, Sonnegstrasse 3, CH-8092 Zurich, Switzerland
| | - Z Kis
- Hungarian Academy of Science, Centre for Energy Research, 29-33 Konkoly Thege Miklos street, 1121 Budapest, Hungary
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Donnini S, Miceli C, Krams R, Bromage D, Papait R, Johnson D, James J, Wilson C, Sartorio CL, Anderson SE, Terzuoli E, Finetti F, Ziche M, Rigacci S, Bargelli V, Giordano C, Raimondi L, Nediani C, Miceli C, Rigacci S, Nediani C, Pedrigi R, Kis Z, Pickard J, Rossello X, Burke N, Ziff O, Yellon D, Davidson S, Pagiatakis C, Rusconi F, Carullo P, Serio S, Condorelli G, Deckx S, Rienks M, Carai P, Van Deel E, Van Der Velden J, Sipido K, Heymans S, Papageorgiou A, Humphries J, Canfield A, Humphries M, Bertoli G, Lazzeroni D, Rimoldi O, Esposito A, Peretto G, Damascelli A, De Cobelli F, Alfieri O, Camici PG, Smith GL, Myles RC. Late Breaking Science posters657Aldehyde Dehydrogenase2 regulates senescence in the vascular endothelium658Monoamine oxidase is over-activated in the left and right ventricles from human ischemic hearts: an intriguing therapeutic target659A novel assay for regulating transcription factors by flow660Remote ischaemic conditioning reduces infarct size in animal in vivo models of ischaemia-reperfusion injury: a systematic review and meta-analysis661The Role of Histone Methyl-transferase G9a in Heart Homeostasis and Cardiac Hypertrophy: a Potential Therapeutic Target for Heart Failure663The extracellular matrix SPARCs cardiac contraction during health and disease664A proteomic investigation into the mechanisms of VEGF-adhesion receptor crosstalk in endothelial cells665Assessing the role of PMCA1 in arrhythmia development relating to β-adrenergic signalling667The expression of beta myosin isoform MYH7B correlates with severity of left ventricular systolic dysfunction in patients with hypertrophic cardiomyopathy668Spatial heterogeneity of sympathetic response in the rabbit myocardium. Cardiovasc Res 2016. [DOI: 10.1093/cvr/cvw143] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Kocsis K, Frank R, Szabó J, Knapp L, Kis Z, Farkas T, Vécsei L, Toldi J. Acetyl-l-carnitine restores synaptic transmission and enhances the inducibility of stable LTP after oxygen-glucose deprivation. Neuroscience 2016; 332:203-11. [PMID: 27378558 DOI: 10.1016/j.neuroscience.2016.06.046] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [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: 04/04/2016] [Revised: 06/09/2016] [Accepted: 06/24/2016] [Indexed: 11/26/2022]
Abstract
Hypoxic circumstances result in functional and structural impairments of the brain. Oxygen-glucose deprivation (OGD) on hippocampal slices is a technique widely used to investigate the consequences of ischemic stroke and the potential neuroprotective effects of different drugs. Acetyl-l-carnitine (ALC) is a naturally occurring substance in the body, and it can therefore be administered safely even in relatively high doses. In previous experiments, ALC pretreatment proved to be effective against global hypoperfusion. In the present study, we investigated whether ALC can be protective in an OGD model. We are not aware of any earlier study in which the long-term potentiation (LTP) function on hippocampal slices was measured after OGD. Therefore, we set out to determine whether an effective ALC concentration has an effect on synaptic plasticity after OGD in the hippocampal CA1 subfield of rats. A further aim was to investigate the mechanism underlying the protective effect of this compound. The experiments revealed that ALC is neuroprotective against OGD in a dose-dependent manner, which is manifested not only in the regeneration of the impaired synaptic transmission after the OGD, but also in the inducibility and stability of the LTP. In the case of the most effective concentration of ALC (500μM), use of a phosphoinositide 3-kinase (PI3K) inhibitor (LY294002) revealed that the PI3K/Akt signaling pathway has a key role in the restoration of the synaptic transmission and plasticity reached by ALC treatment.
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Affiliation(s)
- Kitti Kocsis
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary; MTA-SZTE Neuroscience Research Group, University of Szeged, Szeged, Hungary
| | - Rita Frank
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary
| | - József Szabó
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary
| | - Levente Knapp
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary
| | - Zsolt Kis
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary
| | - Tamás Farkas
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary
| | - László Vécsei
- Department of Neurology, Faculty of Medicine, University of Szeged, Semmelweis u. 6, H-6725 Szeged, Hungary; MTA-SZTE Neuroscience Research Group, University of Szeged, Szeged, Hungary
| | - József Toldi
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary; MTA-SZTE Neuroscience Research Group, University of Szeged, Szeged, Hungary.
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Major T, Gindele R, Szabó Z, Alef T, Thiele B, Bora L, Kis Z, Bárdossy P, Rácz T, Havacs I, Bereczky Z. Evidence for the founder effect of a novel ACVRL1 splice-site mutation in Hungarian hereditary hemorrhagic telangiectasia families. Clin Genet 2016; 90:466-467. [PMID: 27291782 DOI: 10.1111/cge.12806] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2016] [Revised: 05/12/2016] [Accepted: 05/12/2016] [Indexed: 11/30/2022]
Affiliation(s)
- T Major
- Department of Otorhinolaryngology, Markhot Ferenc Hospital, Eger, Hungary.
| | - R Gindele
- Division of Clinical Laboratory Science, Department of Laboratory Medicine, University of Debrecen, Debrecen, Hungary
| | - Z Szabó
- Division of Clinical Laboratory Science, Department of Laboratory Medicine, University of Debrecen, Debrecen, Hungary
| | - T Alef
- Medical Diagnostic Laboratory, Institute of Immunology and Genetics, Kaiserslautern, Germany
| | - B Thiele
- Medical Diagnostic Laboratory, Institute of Immunology and Genetics, Kaiserslautern, Germany
| | - L Bora
- Department of Radiology, Markhot Ferenc Hospital, Eger, Hungary
| | - Z Kis
- Department of Radiology, Markhot Ferenc Hospital, Eger, Hungary
| | - P Bárdossy
- Hungarian Heraldic and Genealogical Society, Budapest, Hungary
| | - T Rácz
- Department of Otorhinolaryngology, Markhot Ferenc Hospital, Eger, Hungary
| | - I Havacs
- Department of Otorhinolaryngology, Markhot Ferenc Hospital, Eger, Hungary
| | - Z Bereczky
- Division of Clinical Laboratory Science, Department of Laboratory Medicine, University of Debrecen, Debrecen, Hungary
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Mandula G, Kis Z, Lengyel K. Real-time dynamic calibration of a tunable frequency laser source using a Fabry-Pérot interferometer. Rev Sci Instrum 2015; 86:123104. [PMID: 26724003 DOI: 10.1063/1.4936971] [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] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report on a method for real-time dynamic calibration of a tunable external cavity diode laser by using a partially mode-matched plano-concave Fabry-Pérot interferometer in reflection geometry. Wide range laser frequency scanning is carried out by piezo-driven tilting of a diffractive grating playing the role of a frequency selective mirror in the laser cavity. The grating tilting system has a considerable mechanical inertness, so static laser frequency calibration leads to false results. The proposed real-time dynamic calibration based on the identification of primary- and Gouy-effect type secondary interference peaks with known frequency and temporal history can be used for a wide scanning range (from 0.2 GHz to more than 1 GHz). A concave spherical mirror with a radius of R = 100 cm and a plain 1% transmitting mirror was used as a Fabry-Pérot interferometer with various resonator lengths to investigate and demonstrate real-time calibration procedures for two kinds of laser frequency scanning functions.
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Affiliation(s)
- Gábor Mandula
- Wigner Research Centre for Physics of the Hungarian Academy of Sciences, Konkoly-Thege Miklós út 29-33, H-1121 Budapest, Hungary
| | - Zsolt Kis
- Wigner Research Centre for Physics of the Hungarian Academy of Sciences, Konkoly-Thege Miklós út 29-33, H-1121 Budapest, Hungary
| | - Krisztián Lengyel
- Wigner Research Centre for Physics of the Hungarian Academy of Sciences, Konkoly-Thege Miklós út 29-33, H-1121 Budapest, Hungary
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23
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Varga D, Herédi J, Kánvási Z, Ruszka M, Kis Z, Ono E, Iwamori N, Iwamori T, Takakuwa H, Vécsei L, Toldi J, Gellért L. Systemic L-Kynurenine sulfate administration disrupts object recognition memory, alters open field behavior and decreases c-Fos immunopositivity in C57Bl/6 mice. Front Behav Neurosci 2015; 9:157. [PMID: 26136670 PMCID: PMC4468612 DOI: 10.3389/fnbeh.2015.00157] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [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: 03/20/2015] [Accepted: 06/01/2015] [Indexed: 01/31/2023] Open
Abstract
L-Kynurenine (L-KYN) is a central metabolite of tryptophan degradation through the kynurenine pathway (KP). The systemic administration of L-KYN sulfate (L-KYNs) leads to a rapid elevation of the neuroactive KP metabolite kynurenic acid (KYNA). An elevated level of KYNA may have multiple effects on the synaptic transmission, resulting in complex behavioral changes, such as hypoactivity or spatial working memory deficits. These results emerged from studies that focused on rats, after low-dose L-KYNs treatment. However, in several studies neuroprotection was achieved through the administration of high-dose L-KYNs. In the present study, our aim was to investigate whether the systemic administration of a high dose of L-KYNs (300 mg/bwkg; i.p.) would produce alterations in behavioral tasks (open field or object recognition) in C57Bl/6j mice. To evaluate the changes in neuronal activity after L-KYNs treatment, in a separate group of animals we estimated c-Fos expression levels in the corresponding subcortical brain areas. The L-KYNs treatment did not affect the general ambulatory activity of C57Bl/6j mice, whereas it altered their moving patterns, elevating the movement velocity and resting time. Additionally, it seemed to increase anxiety-like behavior, as peripheral zone preference of the open field arena emerged and the rearing activity was attenuated. The treatment also completely abolished the formation of object recognition memory and resulted in decreases in the number of c-Fos-immunopositive-cells in the dorsal part of the striatum and in the CA1 pyramidal cell layer of the hippocampus. We conclude that a single exposure to L-KYNs leads to behavioral disturbances, which might be related to the altered basal c-Fos protein expression in C57Bl/6j mice.
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Affiliation(s)
- Dániel Varga
- Department of Physiology, Anatomy and Neuroscience, University of Szeged Szeged, Hungary
| | - Judit Herédi
- Department of Physiology, Anatomy and Neuroscience, University of Szeged Szeged, Hungary
| | - Zita Kánvási
- Department of Physiology, Anatomy and Neuroscience, University of Szeged Szeged, Hungary
| | - Marian Ruszka
- Department of Physiology, Anatomy and Neuroscience, University of Szeged Szeged, Hungary ; Department of Neurology, Faculty of Medicine, MTA-SZTE Neuroscience Research Group, University of Szeged Szeged, Hungary
| | - Zsolt Kis
- Department of Physiology, Anatomy and Neuroscience, University of Szeged Szeged, Hungary
| | - Etsuro Ono
- Department of Biomedicine, Graduate School of Medical Sciences, Kyushu University Fukuoka, Japan ; Center of Biomedical Research, Research Center for Human Disease Modeling, Department of Physiological Sciences, Graduate School of Medical Sciences, Kyushu University Fukuoka, Japan
| | - Naoki Iwamori
- Department of Biomedicine, Graduate School of Medical Sciences, Kyushu University Fukuoka, Japan ; Center of Biomedical Research, Research Center for Human Disease Modeling, Department of Physiological Sciences, Graduate School of Medical Sciences, Kyushu University Fukuoka, Japan
| | - Tokuko Iwamori
- Department of Biomedicine, Graduate School of Medical Sciences, Kyushu University Fukuoka, Japan ; Center of Biomedical Research, Research Center for Human Disease Modeling, Department of Physiological Sciences, Graduate School of Medical Sciences, Kyushu University Fukuoka, Japan
| | - Hiroki Takakuwa
- Faculty of Life Sciences, Kyoto Sangyo University, Kamigamo-Motoyama Kita, Kyoto, Japan
| | - László Vécsei
- Department of Neurology, Faculty of Medicine, MTA-SZTE Neuroscience Research Group, University of Szeged Szeged, Hungary ; Department of Neurology, University of Szeged, Hungary Szeged, Hungary
| | - József Toldi
- Department of Physiology, Anatomy and Neuroscience, University of Szeged Szeged, Hungary ; Department of Neurology, Faculty of Medicine, MTA-SZTE Neuroscience Research Group, University of Szeged Szeged, Hungary
| | - Levente Gellért
- Department of Physiology, Anatomy and Neuroscience, University of Szeged Szeged, Hungary ; Department of Neurology, Faculty of Medicine, MTA-SZTE Neuroscience Research Group, University of Szeged Szeged, Hungary
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Kocsis K, Knapp L, Mészáros J, Kis Z, Farkas T, Vécsei L, Toldi J. Acetyl-L-carnitine and oxaloacetate in post-treatment against LTP impairment in a rat ischemia model. An in vitro electrophysiological study. J Neural Transm (Vienna) 2014; 122:867-72. [PMID: 25432433 DOI: 10.1007/s00702-014-1343-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 11/22/2014] [Indexed: 12/31/2022]
Abstract
A high proportion of research relating to cerebral ischemia focuses on neuroprotection. The application of compounds normally present in the organism is popular, because they do not greatly influence the synaptic activity by receptor modulation, and can be administered without serious side effects. Oxaloacetate (OxAc) and acetyl-L-carnitine (ALC) are such favorable endogenous molecules. ALC can exert a protective effect by improving the energy state of the neurons under ischemic conditions. A promising neuroprotective strategy is glutamate scavenging, which can be achieved by the intravenous administration of OxAc. This study involved the possible protective effects of ALC and OxAc in different post-treatment protocols against long-term potentiation (LTP) impairment. Ischemia was induced in rats by 2-vessel occlusion, which led to a decreased LTP relative to the control group. High-dose (200 mg/kg) ALC or OxAc post-treatment resulted in a higher potentiation relative to the 2VO group, but it did not reach the control level, whereas low-dose ALC (100 mg/kg) in combination with OxAc completely restored the LTP function. Many previous studies have concluded that ALC can be protective only as pretreatment. The strategy described here reveals that ALC can also be neuroprotective when utilized as post-treatment against ischemia.
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Affiliation(s)
- K Kocsis
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Közép fasor 52, 6726, Szeged, Hungary
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25
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Watkinson D, Rimmer M, Kasztovszky Z, Kis Z, Maróti B, Szentmiklósi L. The Use of Neutron Analysis Techniques for Detecting The Concentration And Distribution of Chloride Ions in Archaeological Iron. Archaeometry 2014; 56:841-859. [PMID: 26028670 PMCID: PMC4439727 DOI: 10.1111/arcm.12058] [Citation(s) in RCA: 5] [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] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Accepted: 08/19/2013] [Indexed: 06/04/2023]
Abstract
Chloride (Cl) ions diffuse into iron objects during burial and drive corrosion after excavation. Located under corrosion layers, Cl is inaccessible to many analytical techniques. Neutron analysis offers non-destructive avenues for determining Cl content and distribution in objects. A pilot study used prompt gamma activation analysis (PGAA) and prompt gamma activation imaging (PGAI) to analyse the bulk concentration and longitudinal distribution of Cl in archaeological iron objects. This correlated with the object corrosion rate measured by oxygen consumption, and compared well with Cl measurement using a specific ion meter. High-Cl areas were linked with visible damage to the corrosion layers and attack of the iron core. Neutron techniques have significant advantages in the analysis of archaeological metals, including penetration depth and low detection limits.
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Affiliation(s)
| | - M Rimmer
- Department of Archaeology and Conservation, Cardiff UniversityJohn Percival Building, Colum Drive, Cardiff, CF10 3EU, UK
| | - Z Kasztovszky
- Centre for Energy Research, Hungarian Academy of SciencesH-1525 Budapest, P.O. Box 49, Hungary
| | - Z Kis
- Centre for Energy Research, Hungarian Academy of SciencesH-1525 Budapest, P.O. Box 49, Hungary
| | - B Maróti
- Centre for Energy Research, Hungarian Academy of SciencesH-1525 Budapest, P.O. Box 49, Hungary
| | - L Szentmiklósi
- Centre for Energy Research, Hungarian Academy of SciencesH-1525 Budapest, P.O. Box 49, Hungary
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Knapp L, Gellért L, Kocsis K, Kis Z, Farkas T, Vécsei L, Toldi J. Neuroprotective effect of oxaloacetate in a focal brain ischemic model in the rat. Cell Mol Neurobiol 2014; 35:17-22. [PMID: 24807461 DOI: 10.1007/s10571-014-0064-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Accepted: 04/16/2014] [Indexed: 11/26/2022]
Abstract
During an ischemic event, the well-regulated glutamate (Glu) homeostasis is disturbed, which gives rise to extremely high levels of this excitatory neurotransmitter in the brain tissues. It was earlier reported that the administration of oxaloacetate (OxAc) as a Glu scavenger reduces the Glu level in the brain by enhancing the brain-to-blood Glu efflux. Here, we studied the neuroprotective effect of OxAc administration in a new focal ischemic model in rats. Occlusion of the middle cerebral artery resulted in immediate reduction of the somatosensory-evoked responses (SERs), and the amplitudes remained at the reduced level throughout the whole ischemic period. On reperfusion, the SERs started to increase, but never reached the control level. OxAc proved to be protective, since the amplitudes started to recover even during the ischemia, and finally fully regained the control level. The findings of the histological measurements were in accordance with the electrophysiological data. After Fluoro Jade C staining, significantly fewer labeled cells were detected in the OxAc-treated group relative to the control. These results provide new evidence of the neuroprotective effect of OxAc against ischemic injury, which strengthens the likelihood of its future applicability as a novel neuroprotective agent for the treatment of ischemic stroke patients.
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Affiliation(s)
- L Knapp
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Közép fasor 52, Szeged, H-6726, Hungary
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27
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Oberstedt S, Belgya T, Billnert R, Bryś T, Geerts W, Hambsch FJ, Kis Z, Martinez T, Oberstedt A, Szentmiklosi L, Vidali M. Prompt fission γ-rays from the reactions 252Cf(SF) and 235U(n th, f) – new data. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20136202003] [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: 11/14/2022] Open
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28
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Oláh G, Herédi J, Menyhárt A, Czinege Z, Nagy D, Fuzik J, Kocsis K, Knapp L, Krucsó E, Gellért L, Kis Z, Farkas T, Fülöp F, Párdutz A, Tajti J, Vécsei L, Toldi J. Unexpected effects of peripherally administered kynurenic acid on cortical spreading depression and related blood-brain barrier permeability. Drug Des Devel Ther 2013; 7:981-7. [PMID: 24068867 PMCID: PMC3782408 DOI: 10.2147/dddt.s44496] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Cortical spreading depression (CSD) involves a slowly-propagating depolarization wave in the cortex, which can appear in numerous pathophysiological conditions, such as migraine with aura, stroke, and traumatic brain injury. Neurons and glial cells are also depolarized transiently during the phenomena. CSD is followed by a massive increase in glutamate release and by changes in the brain microcirculation. The aim of this study was to investigate the effects of two N-methyl-D-aspartate receptor antagonists, endogenous kynurenic acid (KYNA) and dizocilpine, on CSD and the related blood-brain barrier (BBB) permeability in rats. In intact animals, KYNA hardly crosses the BBB but has some positive features as compared with its precursor L-Kynurenine, which is frequently used in animal studies (KYNA cannot be metabolized to excitotoxic agents such as 3-hydroxy-L-kynurenine and quinolinic acid). We therefore investigated the possible effects of peripherally administered KYNA. Repetitive CSD waves were elicited by the application of 1 M KCl solution to the cortex. Direct current-electrocorticograms were measured for 1 hour. Four parameters of the waves were compared. Evans blue dye and fluorescent microscopy were used to study the possible changes in the permeability of the BBB. The results demonstrated that N-methyl-D-aspartate receptor antagonists can reduce the number of CSD waves and decrease the permeability of the BBB during CSD. These results suggest that KYNA itself or its derivatives may offer a new approach in the therapy of migraines.
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Affiliation(s)
- Gáspár Oláh
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Közép fasor 52, Szeged, Hungary
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29
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Kis Z, Jones J, Creanga A, Ferdinand K, Inui K, Gerloff N, Davis CT, Nguyen T, Donis RO. Real-time RT-PCR assay to differentiate clades of H5N1 avian influenza viruses circulating in Vietnam. J Virol Methods 2013; 193:452-8. [PMID: 23850699 DOI: 10.1016/j.jviromet.2013.06.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [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: 02/22/2013] [Revised: 06/09/2013] [Accepted: 06/14/2013] [Indexed: 11/25/2022]
Abstract
Continued circulation and geographical expansion of highly pathogenic avian influenza H5N1 virus have led to the emergence of numerous clades in Vietnam. Although viral RNA sequencing and phylogenetic analysis are the gold standard for H5N1 HA clade designation, limited sequencing capacity in many laboratories precludes rapid H5N1 clade identification and detection of novel viruses. Therefore, a Taqman real-time RT-PCR assay for rapid differentiation of the four major H5N1 clades detected in Vietnam was developed. Using HA sequence alignments of clades 1.1, 2.3.2.1, 2.3.4, and 7 viruses, primers and FAM-labeled probes were designed to target conserved regions characteristic of each clade. The assay was optimized and evaluated using circulating clades of H5N1 collected in Vietnam from 2007 to 2012 and shown to be both sensitive and specific for the differentiation of the four H5N1 clades. The assay provides a useful tool for screening of large specimen collections for HA gene sequencing and phylogenetic analysis and for the rapid identification of molecular clade signatures to support outbreak investigations and surveillance activities. Finally, this assay may be useful to monitor for the emergence of novel or variant clades of H5N1 in Vietnam in the future or in other countries where these particular clades may circulate.
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Affiliation(s)
- Z Kis
- Influenza Division, CDC, USA; National Center for Epidemiology, Budapest, Hungary
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Knapp L, Gellért L, Herédi J, Kocsis K, Oláh G, Fuzik J, Kis Z, Vécsei L, Toldi J, Farkas T. A simple novel technique to induce short-lasting local brain ischaemia in the rat. Neuropathol Appl Neurobiol 2013; 40:603-9. [PMID: 23795719 DOI: 10.1111/nan.12069] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 09/03/2012] [Accepted: 06/14/2013] [Indexed: 11/30/2022]
Abstract
AIMS Brain ischaemia models are essential to study the pathomechanisms of stroke. Our aim was to investigate the reliability and reproducibility of our novel focal ischaemia-reperfusion model. METHODS To induce a cortical transient ischaemic attack, we lifted the distal middle cerebral artery (MCA) with a special hook. The early changes after 2 × 15-min occlusion were observed in the somatosensory evoked responses (SERs). The histological responses to 2 × 15-min MCA occlusion and to 30-, 45- or 60-min ischaemia were examined after a 1-day survival period by 2,3,5-triphenyltetrazolium chloride (TTC) and Fluoro Jade C (FJC) staining. Another group, with 30-min ischaemia, was analysed histologically by FJC, S100 and CD11b labelling after a 5-day survival period. RESULTS The amplitudes of the SERs decreased immediately at the beginning of the ischaemic period, and remained at a reduced level during the ischaemia. Reperfusion resulted in increasing SER amplitudes, but they never regained the control level. The short-lasting ischaemia did not lead to brain infarction when evaluated with TTC, but intense labelling was found with FJC. The 30-min ischaemia did not result in FJC labelling after 1 day, but marked labelling was observed after 5 days with FJC, S100 and CD11b in the cortical area supplied by the MCA. CONCLUSIONS We present here a novel, readily reproducible method to induce focal brain ischaemia. The ischaemia-reperfusion results in noteworthy changes in the SERs and the appearance of conventional tissue damage markers. This method involves possibilities for precise blood flow regulation, and the setting of the required level of perfusion.
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Affiliation(s)
- Levente Knapp
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Szeged, Hungary
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Gellért L, Knapp L, Németh K, Herédi J, Varga D, Oláh G, Kocsis K, Menyhárt A, Kis Z, Farkas T, Vécsei L, Toldi J. Post-ischemic treatment with L-kynurenine sulfate exacerbates neuronal damage after transient middle cerebral artery occlusion. Neuroscience 2013; 247:95-101. [PMID: 23685169 DOI: 10.1016/j.neuroscience.2013.04.063] [Citation(s) in RCA: 13] [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: 03/03/2013] [Revised: 04/27/2013] [Accepted: 04/30/2013] [Indexed: 11/28/2022]
Abstract
Since brain ischemia is one of the leading causes of adult disability and death, neuroprotection of the ischemic brain is of particular importance. Acute neuroprotective strategies usually have the aim of suppressing glutamate excitotoxicity and an excessive N-methyl-d-aspartate (NMDA) receptor function. Clinically tolerated antagonists should antagonize an excessive NMDA receptor function without compromising the normal synaptic function. Kynurenic acid (KYNA) an endogenous metabolite of the tryptophan metabolism, may be an attractive neuroprotectant in this regard. The manipulation of brain KYNA levels was earlier found to effectively enhance the histopathological outcome of experimental ischemic/hypoxic states. The present investigation of the neuroprotective capacity of L-kynurenine sulfate (L-KYNs) administered systemically after reperfusion in a novel distal middle cerebral artery occlusion (dMCAO) model of focal ischemia/reperfusion revealed that in contrast with earlier results, treatment with L-KYNs worsened the histopathological outcome of dMCAO. This contradictory result indicates that post-ischemic treatment with L-KYNs may be harmful.
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Affiliation(s)
- L Gellért
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary
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32
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Szabó Z, Völgyesi P, Nagy HÉ, Szabó C, Kis Z, Csorba O. Radioactivity of natural and artificial building materials - a comparative study. J Environ Radioact 2013; 118:64-74. [PMID: 23246704 DOI: 10.1016/j.jenvrad.2012.11.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Revised: 10/30/2012] [Accepted: 11/07/2012] [Indexed: 06/01/2023]
Abstract
Building materials and their additives contain radioactive isotopes, which can increase both external and internal radioactive exposures of humans. In this study Hungarian natural (adobe) and artificial (brick, concrete, coal slag, coal slag concrete and gas silicate) building materials were examined. We qualified 40 samples based on their radium equivalent, activity concentration, external hazard and internal hazard indices and the determined threshold values of these parameters. Absorbed dose rate and annual effective dose for inhabitants living in buildings made of these building materials were also evaluated. The calculations are based on (226)Ra, (232)Th and (40)K activity concentrations determined by gamma-ray spectrometry. Measured radionuclide concentrations and hence, calculated indices and doses of artificial building materials show a rather disparate distribution compared to adobes. The studied coal slag samples among the artificial building materials have elevated (226)Ra content. Natural, i.e. adobe and also brick samples contain higher amount of (40)K compared to other artificial building materials. Correlation coefficients among radionuclide concentrations are consistent with the values in the literature and connected to the natural geochemical behavior of U, Th and K elements. Seven samples (coal slag and coal slag concrete) exceed any of the threshold values of the calculated hazard indices, however only three of them are considered to be risky to use according to the fact that the building material was used in bulk amount or in restricted usage. It is shown, that using different indices can lead to different conclusions; hence we recommend considering more of the indices at the same time when building materials are studied. Additionally, adding two times their statistical uncertainties to their values before comparing to thresholds should be considered for providing a more conservative qualification. We have defined radon hazard portion to point to the limitations of the internal hazard considerations based on only measured (226)Ra activity concentrations without direct radon measurements. Our data are compared to those obtained in other countries and they provide a good basis to expand the database of radioactivity of building materials and gives information about the safety and situation of the building material industry in this central region of Europe.
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Affiliation(s)
- Zs Szabó
- Lithosphere Fluid Research Laboratory, Department of Petrology and Geochemistry, Eötvös University, 1/C, Pázmány P. b., Budapest H-1117, Hungary.
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Fuzik J, Gellért L, Oláh G, Herédi J, Kocsis K, Knapp L, Nagy D, Kincses ZT, Kis Z, Farkas T, Toldi J. Fundamental interstrain differences in cortical activity between Wistar and Sprague-Dawley rats during global ischemia. Neuroscience 2012; 228:371-81. [PMID: 23103797 DOI: 10.1016/j.neuroscience.2012.10.042] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Revised: 10/18/2012] [Accepted: 10/19/2012] [Indexed: 10/27/2022]
Abstract
Four-vessel occlusion (4VO), a frequently used model of global cerebral ischemia in rats, results in a dysfunction in wide brain areas, including the cerebral cortex and hippocampus. However, there are pronounced differences in response to global ischemia between the laboratory rat strains used in these studies. In the present work, the immediate acute effects of 4VO-induced global ischemia on the spontaneous electrocorticogram (ECoG) signals were analyzed in Wistar and Sprague-Dawley rats. The ECoG was isoelectric during the 10 min of global cerebral ischemia in Wistar rats and the first burst (FB) was seen 10-13 min after the start of reperfusion. In Sprague-Dawley rats, the FB was detected immediately after the start of 4VO or a few seconds later. The burst suppression ratio (BSR) in Wistar rats decreased to 45% in 5 min after FB, and after 25 min it was approximately 40%. In Sprague-Dawley rats, the BSR was 55% immediately after the FB and it decreased steeply to reach 0% by 10 min. There was also a significant difference between the two strains in the frequency composition of the ECoG pattern. The power spectral densities of the two strains differed virtually throughout the post-ischemic state. The histological results (Evans Blue, Cresyl Violet and Fluoro Jade C stainings) supplemented the electrophysiological data: the neuronal damage in the CA1 pyramids in Wistar rats was severe, whereas in the Sprague-Dawley animals it was only partial. These observations clearly demonstrate that the use of different rat strains (e.g. Wistar vs. Sprague-Dawley) can be a source of considerable variability in the results of acute experiments on global ischemia and it is important that the laboratory rats used in such experiments should be carefully chosen.
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Affiliation(s)
- J Fuzik
- University of Szeged, Department of Physiology, Anatomy and Neuroscience, Közép fasor 52, H-6726 Szeged, Hungary
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Nagy D, Kocsis K, Fuzik J, Marosi M, Kis Z, Teichberg VI, Toldi J, Farkas T. Kainate postconditioning restores LTP in ischemic hippocampal CA1: onset-dependent second pathophysiological stress. Neuropharmacology 2011; 61:1026-32. [PMID: 21781978 DOI: 10.1016/j.neuropharm.2011.07.005] [Citation(s) in RCA: 20] [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: 04/06/2011] [Revised: 06/14/2011] [Accepted: 07/06/2011] [Indexed: 11/29/2022]
Abstract
Postconditioning can be induced by a broad range of stimuli within minutes to days after an ischemic cerebral insult. A special form is elicited by pharmacological intervention called second pathophysiological stress. The present study aimed to evaluate the effects of low-dose (5 mg/kg) kainate postconditioning with onsets 0, 24 and 48 h after the ischemic insult on the hippocampal synaptic plasticity in a 2-vessel occlusion model in rat. The hippocampal function was tested by LTP measurements of Schaffer collateral-CA1 pyramidal cell synapses in acute slices and the changes in density of Golgi-Cox-stained apical dendritic spines. Postconditioning 0 and 24 h after ischemia was not protective, whereas 48-h-onset postconditioning resulted in the reappearance of a normal spine density (>100,000 spines) 3 days after ischemia, in parallel with the long-term restoration of the damaged LTP function. Similar, but somewhat less effects were observed after 10 days. Our data clearly demonstrate the onset dependence of postconditioning elicited by a subconvulsant dose of kainate treatment in global ischemia, with restoration of the structural plasticity and hippocampal function.
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Affiliation(s)
- Dávid Nagy
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Szeged, Hungary
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Gellért L, Fuzik J, Göblös A, Sárközi K, Marosi M, Kis Z, Farkas T, Szatmári I, Fülöp F, Vécsei L, Toldi J. Neuroprotection with a new kynurenic acid analog in the four-vessel occlusion model of ischemia. Eur J Pharmacol 2011; 667:182-7. [PMID: 21664350 DOI: 10.1016/j.ejphar.2011.05.069] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Revised: 05/04/2011] [Accepted: 05/22/2011] [Indexed: 10/18/2022]
Abstract
Global forebrain ischemia results in damage to the pyramids in the CA1 hippocampal subfield, which is particularly vulnerable to excitotoxic processes. Morphological and functional disintegration of this area leads to a cognitive dysfunction and neuropsychiatric disorders. Treatment with N-methyl-d-aspartate receptor antagonists is a widely accepted method with which to stop the advance of excitotoxic processes and concomitant neuronal death. From a clinical aspect, competitive glycine- and polyamine-site antagonists with relatively low affinity and moderate side-effects are taken into account. Endogenous kynurenic acid acts as an antagonist on the obligatory co-agonist glycine site, and has long been at the focus of neuroprotective trials. In the present study, we estimated the neuroprotective capability of a novel kynurenic acid analog in transient global forebrain ischemia, measuring the rate of hippocampal CA1 pyramidal cell loss and the preservation of long-term potentiation at Schaffer collateral-CA1 synapses. The neuroprotective potential was reflected by a significantly diminished hippocampal CA1 cell loss and preserved long-term potentiation expression. The neuroprotective effect was robust in the event of pretreatment, and also when the drug was administered at the time of reperfusion. This result is beneficial since a putative neuroprotectant proven to be effective as post-treatment is of much greater benefit.
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Affiliation(s)
- Levente Gellért
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary
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Oberstedt S, Belgya T, Billnert R, Borcea R, Cano-Ott D, Göök A, Hambsch FJ, Karlsson J, Kis Z, Martinez T, Oberstedt A, Szentmiklosi L, Takác K. Correlation measurements of fission-fragment properties. EPJ Web of Conferences 2010. [DOI: 10.1051/epjconf/20100803005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Marosi M, Nagy D, Farkas T, Kis Z, Rózsa E, Robotka H, Fülöp F, Vécsei L, Toldi J. A novel kynurenic acid analogue: a comparison with kynurenic acid. An in vitro electrophysiological study. J Neural Transm (Vienna) 2009; 117:183-8. [PMID: 19953278 DOI: 10.1007/s00702-009-0346-2] [Citation(s) in RCA: 29] [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] [Received: 06/04/2009] [Accepted: 11/16/2009] [Indexed: 11/29/2022]
Abstract
Kynurenic acid is an endogenous product of the tryptophan metabolism, and as a broad-spectrum antagonist of excitatory amino acid receptors may serve as a protective agent in neurological disorders. The use of kynurenic acid as a neuroprotective agent is rather limited, however, because it has only restricted ability to cross the blood-brain barrier. Accordingly, new kynurenic acid analogues which can readily cross the blood-brain barrier and exert their complex anti-excitotoxic activity are greatly needed. Such a novel analogue, 2-(2-N,N-dimethylaminoethylamine-1-carbonyl)-1H-quinolin-4-one hydrochloride, has been developed and tested. In an in vitro electrophysiological study, in which its properties were compared with those of kynurenic acid, the new analogue behaved quite similarly to kynurenic acid: in the micromolar range, its administration led to a decrease in the amplitudes of the field excitatory postsynaptic potentials in the CA1 region of the hippocampus, while in nanomolar concentrations it did not give rise to inhibition, but, in fact, facilitated the field excitatory postsynaptic potentials. Moreover, the new analogue demonstrated similar protective action against PTZ-induced facilitation to that observed after kynurenic acid administration. The findings strongly suggest that the neuroactive effects of the new analogue are comparable with those of kynurenic acid, but, in contrast with kynurenic acid, it readily crosses the blood-brain barrier. The new analogue may therefore be considered a promising candidate for clinical studies.
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Affiliation(s)
- Máté Marosi
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
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Tiszlavicz Z, Somogyvári F, Kocsis AK, Szolnoki Z, Sztriha LK, Kis Z, Vécsei L, Mándi Y. Relevance of the genetic polymorphism of NOD1 in Chlamydia pneumoniae seropositive stroke patients. Eur J Neurol 2009; 16:1224-9. [PMID: 19538217 DOI: 10.1111/j.1468-1331.2009.02698.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND PURPOSE Chronic infections with certain pathogens, such as Chlamydia pneumoniae, and genetic parameters that influence inflammatory reactions have been suggested to contribute to ischaemic stroke. NOD1 is a potent cytosolic receptor for C. pneumoniae. The aim of this study was to investigate the genetic polymorphism of NOD1 from the aspect of the development of stroke. MATERIALS AND METHODS A total of 280 patients with ischaemic stroke were enrolled in the study; 150 healthy blood donors served as controls. The G796A (E266K) NOD1 polymorphism was determined by restriction fragment length polymorphism. Chlamydia pneumoniae seropositivity was tested by ELISA. RESULTS There was a significant difference in NOD1 G796A genotype distribution between the controls and the stroke patients with C. pneumoniae seropositivity. The AA homozygote and GA heterozygote mutant variants were detected in 16% (25 of 152) and in 50% (77 of 152) of the C. pneumoniae-positive stroke patients, as compared with 8% (6 of 84), and 28% (24 of 84), respectively, in the C. pneumoniae-positive healthy controls. (OR = 2.559; 95% CI = 1.105-6.517, P = 0.04 and OR = 2.567; 95% CI = 1.451-4.540 P < 0.001, respectively). The stroke patients with the large vessel pathology exhibited the highest frequency of the mutant allele A (51%). In contrast, amongst the C. pneumoniae-negative subjects, no difference in genotype frequency was observed between the stroke patients and the controls. CONCLUSION Polymorphism in NOD1 G796A alone did not prove to be a risk factor for stroke in general, but in association with C. pneumoniae infection it appeared to be accompanied by an increased risk of the development of stroke.
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Affiliation(s)
- Z Tiszlavicz
- Department of Medical Microbiology and Immunobiology, University of Szeged, Szeged, Hungary
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Marosi M, Fuzik J, Nagy D, Rákos G, Kis Z, Vécsei L, Toldi J, Ruban-Matuzani A, Teichberg VI, Farkas T. Oxaloacetate restores the long-term potentiation impaired in rat hippocampus CA1 region by 2-vessel occlusion. Eur J Pharmacol 2008; 604:51-7. [PMID: 19135048 DOI: 10.1016/j.ejphar.2008.12.022] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2008] [Revised: 11/20/2008] [Accepted: 12/03/2008] [Indexed: 10/21/2022]
Abstract
Various acute brain pathological conditions are characterized by the presence of elevated glutamate concentrations in the brain interstitial fluids. It has been established that a decrease in the blood glutamate level enhances the brain-to-blood efflux of glutamate, removal of which from the brain may prevent glutamate excitotoxicity and its contribution to the long-lasting neurological deficits seen in stroke. A decrease in blood glutamate level can be achieved by exploiting the glutamate-scavenging properties of the blood-resident enzyme glutamate-oxaloacetate transaminase, which transforms glutamate into 2-ketoglutarate in the presence of the glutamate co-substrate oxaloacetate. The present study had the aim of an evaluation of the effects of the blood glutamate scavenger oxaloacetate on the impaired long-term potentiation (LTP) induced in the 2-vessel occlusion ischaemic model in rat. Transient (30-min) incomplete forebrain ischaemia was produced 72 h before LTP induction. Although the short transient brain hypoperfusion did not induce histologically identifiable injuries in the CA1 region (Fluoro-Jade B, S-100 and cresyl violet), it resulted in an impaired LTP function in the hippocampal CA1 region without damaging the basal synaptic transmission between the Schaffer collaterals and the pyramidal neurons. This impairment could be fended off in a dose-dependent manner by the intravenous administration of oxaloacetate in saline (at doses between 1.5 mmol and 0.1 mumol) immediately after the transient hypoperfusion. Our results suggest that oxaloacetate-mediated blood and brain glutamate scavenging contributes to the restoration of the LTP after its impairment by brain ischaemia.
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Affiliation(s)
- Máté Marosi
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary
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Kis Z, Burian K, Treso B, Acs K, Prohaszka Z, Fust G, Gonczol E, Endresz V. Inflammatory- and immune responses in relation to bacterial replication in mice following re-infections with Chlamydophila pneumoniae. Inflamm Res 2008; 57:287-95. [PMID: 18516711 DOI: 10.1007/s00011-007-7124-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVE Investigation of chronic infections with Chlamydophila pneumoniae. METHODS BALB/c mice were repeatedly infected with C. pneumoniae and tested during a 1-year period. Production of histamine, IFN-gamma, IL-6 and antibodies was monitored by ELISA. Live bacteria were cultured and DNA was detected by PCR. Cellular immunity was tested by ELISPOT. RESULTS After re-infections, culture positivity and persistence of DNA in lungs and blood were shorter. Detection of DNA at late time points indicated persistent infection in a few mice. Histamine was produced after primary and re-infections, and the level correlated with the number of viable bacteria in lung. IFN-gamma, IL-6 levels, IgG2/IgG1 ratio, IgA titres, and level of chlamydial heat-shock protein antibodies were higher after re-infections. IgM antibodies were demonstrated even after re-infections. High number of IFN-gamma-producing splenocytes was observed after the third inoculation. CONCLUSION These results promote an understanding of the patho- and immune mechanisms after C. pneumoniae re-infections.
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Affiliation(s)
- Z Kis
- Division of Virology, National Center for Epidemiology, Budapest, Hungary
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Belgya T, Kis Z, Szentmiklósi L, Kasztovszky Z, Festa G, Andreanelli L, De Pascale MP, Pietropaolo A, Kudejova P, Schulze R, Materna T. A new PGAI-NT setup at the NIPS facility of the Budapest Research Reactor. J Radioanal Nucl Chem 2008. [DOI: 10.1007/s10967-008-1510-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Petrovay F, Heltai K, Kis Z, Treso B, Gonczol E, Burian K, Endresz V, Valyi-Nagy I. Chronic infections and histamine, CRP and IL-6 levels after percutaneous transluminal coronary angioplasty. Inflamm Res 2007; 56:362-7. [PMID: 17878998 DOI: 10.1007/s00011-007-7045-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [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: 10/22/2022] Open
Abstract
OBJECTIVE AND DESIGN Our hypothesis was that percutaneous transluminal coronary angioplasty (PTCA) reactivates certain pathogens that contribute to inflammatory processes after the intervention. SUBJECTS We determined the levels of antibodies to human Hsp60 and levels of histamine, CRP and IL-6 in sera from 28 patients of unstable angina prior to and on days 4 and 14 after PTCA. We compared the presence of Chlamydophila pneumoniae (Cpn) and human cytomegalovirus (HCMV) DNA in peripheral blood, and levels of antibodies to Cpn, HCMV, herpes simplex virus, Epstein-Barr virus and mycobacterial Hsp65 in the serum. RESULTS Higher prevalence of Cpn and HCMV DNA was demonstrated after PTCA than before, but titers of antibodies to the pathogens did not increase. Levels of histamine, CRP and IL-6 were enhanced after PTCA. There was no association between the levels of histamine, CRP and IL-6 and the rate of pathogen DNA, or antibody titers to the pathogens, except an association between Cpn IgA and histamine levels before PTCA. CONCLUSIONS Reactivation of Cpn and HCMV and inflammatory change characterized by increased levels of histamine, CRP and IL-6 following PTCA are suggested. An association might exist between Cpn IgA antibody and histamine levels in patients of unstable angina.
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Affiliation(s)
- F Petrovay
- Division of Bacteriology, National Center for Epidemiology, Budapest, Hungary
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Rákos G, Kis Z, Nagy D, Lür G, Farkas T, Hortobágyi T, Vécsei L, Toldi J. Evans Blue fluorescence permits the rapid visualization of non-intact cells in the perilesional rim of cold-injured rat brain. Acta Neurobiol Exp (Wars) 2007; 67:149-54. [PMID: 17691222 DOI: 10.55782/ane-2007-1642] [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: 12/16/2023]
Abstract
A focal cold lesion-induced injury, i.e., a model of focal vasogenic brain edema, enhances the permeability of the blood-brain barrier and cell membrane in the perilesional rim. However, non-intact cells can be detected, e.g. by markers of apoptosis, only hours or even days after the injury. The early membrane dysfunction allows extravasated serum proteins to enter the injured cells, which can be readily visualized if the plasma albumin was previously bound to fluorescent tracers, such as Evans Blue (EB). The aim of this study was to demonstrate injured cells that take up the EB/albumin conjugate in the perilesional rim. This tracer was administered 3.5 h after the induction of the injury and the animals were sacrificed 30 min later. With an excitation wavelength of 530-550 nm, the EB-positive cells emitted bright-red fluorescence at > 590 nm and were easy to count. No positive cells were observed in the controls. This method provides more information than the classical 2,3,5-triphenyltetrazolium chloride reaction, because it permits an assessment of the density and distribution of cells with non-intact cell membranes in the perilesional area following cerebrocortical injury.
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Affiliation(s)
- Gabriella Rákos
- Department of Comparative Physiology, University of Szeged, POB 533, H-6701 Szeged, Hungary
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Horváth S, Prandovszky E, Kis Z, Krummenacher C, Eisenberg RJ, Cohen GH, Janka Z, Toldi J. Spatiotemporal changes of the herpes simplex virus entry receptor nectin-1 in murine brain during postnatal development. J Neurovirol 2006; 12:161-70. [PMID: 16877297 DOI: 10.1080/13550280600760594] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Herpes simplex virus (HSV) is known to replicate within the limbic system and to alter behavior in both humans and experimental animals. However, the reason why the virus selectively damages this anatomical, developmental, and functional neural unit remains a mystery. Nor is it known why herpes simplex encephalitis fails to respect these neuroanatomical boundaries in newborns. In the present study, the authors determined the spatiotemporal changes in the distribution of the major neural entry receptor for HSV (nectin-1) in postnatal mouse and rat brains. Discrete nectin-1 immunopositivity was observed in regions susceptible to HSV infection in specific developmental phases of central nervous system. The authors also describe nectin-1-related pathways controlling neuronal cell migration/brain morphogenesis, the disruption of which might lead to the emergence of mental disorders with a rapid cognitive decline.
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Affiliation(s)
- Szatmár Horváth
- Department of Psychiatry, Faculty of Medicine, University of Szeged, Szeged, Hungary.
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Ould-Dada Z, Carini F, Eged K, Kis Z, Linkov I, Mitchell NG, Mourlon C, Robles B, Sweeck L, Venter A. Radionuclides in fruit systems: model prediction-experimental data intercomparison study. Sci Total Environ 2006; 366:514-24. [PMID: 16413598 DOI: 10.1016/j.scitotenv.2005.10.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2004] [Revised: 10/07/2005] [Accepted: 10/10/2005] [Indexed: 05/06/2023]
Abstract
This paper presents results from an international exercise undertaken to test model predictions against an independent data set for the transfer of radioactivity to fruit. Six models with various structures and complexity participated in this exercise. Predictions from these models were compared against independent experimental measurements on the transfer of 134Cs and 85Sr via leaf-to-fruit and soil-to-fruit in strawberry plants after an acute release. Foliar contamination was carried out through wet deposition on the plant at two different growing stages, anthesis and ripening, while soil contamination was effected at anthesis only. In the case of foliar contamination, predicted values are within the same order of magnitude as the measured values for both radionuclides, while in the case of soil contamination models tend to under-predict by up to three orders of magnitude for 134Cs, while differences for 85Sr are lower. Performance of models against experimental data is discussed together with the lessons learned from this exercise.
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Affiliation(s)
- Z Ould-Dada
- Food Standards Agency, Radiological Protection and Research Management Division, Aviation House, 125 Kingsway, Room 715B, London WC2B 6NH, United Kingdom.
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Kis Z, Pallinger E, Endresz V, Burian K, Falus A, Berencsi G, Gonczol E. A soluble factor(s) released by MRC-5 cells early and late after human cytomegalovirus infection induces maturation of monocyte-derived dendritic cells. Arch Virol 2006; 151:2277-87. [PMID: 16773236 DOI: 10.1007/s00705-006-0799-7] [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] [Received: 12/14/2005] [Accepted: 05/09/2006] [Indexed: 12/01/2022]
Abstract
A human cytomegalovirus (HCMV) strain passaged 10 times on MRC-5 human fibroblast cells failed to express immediate early (IE) antigens in immature dendritic cells (iDCs) after infection. However, both the early and the late HCMV conditioning medium, harvested from MRC-5 cells at 24 h or 7-9 days after infection, respectively, induced a higher ratio of DCs expressing maturation markers (CD40, CD83, CD86 and HLA-DR) on the surface of the cells. HCMV conditioning medium, ultracentrifuged to remove virus particles, exhibited a similarly enhanced expression of DC maturation markers. DCs treated with HCMV conditioning medium harvested late after infection increased the percentages of autologous CD4+ and CD8+ cells of seropositive donors to produce IFN-gamma and stimulated HCMV-specific lymphoproliferative responses. The early HCMC conditioning medium was also able to induce the functional maturation of DCs, as demonstrated by supplementing this medium with a Chlamydia pneumoniae antigen.
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Affiliation(s)
- Z Kis
- Division of Virology, National Center for Epidemiology, Budapest, Hungary
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Lür G, Rákos G, Juhász-Vedres G, Farkas T, Kis Z, Toldi J. Effects of Dehydroepiandrosterone Sulfate on the Evoked Cortical Activity of Controls and of Brain-Injured Rats. Cell Mol Neurobiol 2006; 26:1505-19. [PMID: 16758322 DOI: 10.1007/s10571-006-9073-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [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: 10/03/2005] [Accepted: 04/19/2006] [Indexed: 11/28/2022]
Abstract
1. Dehydroepiandrosterone (DHEA) and its sulfate (DHEAS) are sex hormone precursors which exert marked neurotrophic and/or neuroprotective activity in the central nervous system (CNS). 2. In the present electrophysiological experiments, we studied the effects of peripherally administered DHEAS on responses of the primary somatosensory (SSI) and motor cortices (MI) of (i) anesthetized controls and (ii) MI focal cold-lesioned rats. (iii) The effects of DHEAS on the field excitatory postsynaptic potentials (fEPSPs) were also studied in vitro brain slices. DHEAS (50 mg/kg) was injected subcutaneously 12 h before and immediately after cold lesion induction. The anesthetized rats were fixed in a stereotaxic frame, the SSI and MI were exposed, and control SSI and MI responses were evoked by contralateral whisker pad stimulation. After registration of the evoked responses for a 35-min period, a copper cylinder (2 mm in diameter) cooled with a mixture of acetone and dry ice (-78 degrees C) was applied to produce a lesion in the MI and the registration of the evoked responses was then continued for an additional 360 min. 3. In the controls, DHEAS administration resulted in slight increases in amplitude of both the SSI and the MI responses. After focal cold lesion induction, the most significant reduction in amplitude was observed at the focus of the lesion in the primary MI, but the amplitudes of the SSI responses were also decreased. After 3-5 h of lesion induction, the amplitudes started to increase around the injury in the primary MI, while the SSI response had already started to recover 2 h after induction of the MI lesion. In the course of the postlesion recovery period, the MI responses peripherally to the center of the lesion frequently exhibited extremely high and low amplitudes. The paired-pulse paradigm revealed changing, but basically high levels of disinhibition and facilitation in extended cortical areas after focal cortical cold lesion induction. The deviations (e.g., the extremely augmented responses) in cortical functioning of the anesthetized rats were unambiguously diminished by DHEAS administration, and the period required for the cortical responses to recover was significantly shorter after the steroid treatment. In the in vitro studies, however, DHEAS administration resulted in an enhanced level of disinhibition in extended cortical areas of both the hemispheres. 4. This observation draws attention to the possible differences between the results obtained in different models (in vitro vs. in situ). Nevertheless, all the presented data suggest that DHEAS treatment might have neuroprotective effect on the neocortex at least at a short-time scale.
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Affiliation(s)
- György Lür
- Department of Comparative Physiology, University of Szeged, P.O.B. 533, H-6701, Szeged, Hungary
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Szegedi V, Juhász G, Rózsa E, Juhász-Vedres G, Datki Z, Fülöp L, Bozsó Z, Lakatos A, Laczkó I, Farkas T, Kis Z, Tóth G, Soós K, Zarándi M, Budai D, Toldi J, Penke B. Endomorphin‐2, an endogenous tetrapeptide, protects against Aβ1‐42
in vitro
and
in vivo. FASEB J 2006; 20:1191-3. [PMID: 16636106 DOI: 10.1096/fj.05-4891fje] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [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: 11/11/2022]
Abstract
The underlying cause of Alzheimer's disease (AD) is thought to be the beta-amyloid aggregates formed mainly by Abeta1-42 peptide. Protective pentapeptides [e.g., Leu-Pro-Phe-Phe-Asp (LPFFD)] have been shown to prevent neuronal toxicity of Abeta1-42 by arresting and reversing fibril formation. Here we report that an endogenous tetrapeptide, endomorphin-2 (End-2, amino acid sequence: YPFF), defends against Abeta1-42 induced neuromodulatory effects at the cellular level. Although End-2 does not interfere with the kinetics of Abeta fibrillogenesis according to transmission electron microscopic studies and quasielastic light scattering measurements, it binds to Abeta1-42 during aggregation, as revealed by tritium-labeled End-2 binding assay and circular dichroism measurements. The tetrapeptide attenuates the inhibitory effect on cellular redox activity of Abeta1-42 in a dose-dependent manner, as measured by 3-(4,5-dimethylthiazolyl-2)-2,-5-diphenyltetrazolium bromide (MTT) assay. In vitro and in vivo electrophysiological experiments show that End-2 also protects against the field excitatory postsynaptic potential attenuating and the NMDA-evoked response-enhancing effect of Abeta1-42. Studies using [D-Ala (2), N-Me-Phe (4), Gly (5)-ol]-enkephalin (DAMGO), a mu-opioid receptor agonist, show that the protective effects of the tetrapeptide are not mu-receptor modulated. The endogenous tetrapeptide End-2 may serve as a lead compound for the drug development in the treatment of AD.
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Affiliation(s)
- Viktor Szegedi
- Department of Medical Chemistry, University of Szeged, Dóm Square 8, Szeged 6720, Hungary.
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Marosi M, Rákos G, Robotka H, Németh H, Sas K, Kis Z, Farkas T, Lür G, Vécsei L, Toldi J. Hippocampal (CA1) activities in Wistar rats from different vendors. Fundamental differences in acute ischemia. J Neurosci Methods 2006; 156:231-5. [PMID: 16621009 DOI: 10.1016/j.jneumeth.2006.03.010] [Citation(s) in RCA: 27] [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] [Received: 02/01/2006] [Revised: 03/01/2006] [Accepted: 03/07/2006] [Indexed: 11/30/2022]
Abstract
Two-vessel occlusion, a frequently used model of global cerebral ischemia in rats, results in a dysfunction predominantly within the CA1 field of the hippocampus; it induces many processes with different time-scales. However, the great divergence in the results of the studies reported in the literature suggests valuable differences in response to hypoperfusion-induced ischemia among the laboratory rats used in these studies. In the present work, the acute effects of two-carotid occlusion-induced global ischemia (2VO) on the CA3 stimulation-evoked population spike activity in the CA1 region of Wistar rats from different suppliers (Charles-River and Harlan) were compared. In the acute electrophysiological experiments, the hippocampal CA1 responses revealed that the Charles-River rats immediately compensated the 2VO much better than did the Harlan rats. However, 3 days later, no difference could be observed between the CA1 activities of these rats. The presented data show that the Wistar rats from different vendors represent an important source of variability in the results of acute experiments on the hippocampal ischemia. These observations draw attention to the importance of the careful choice of the laboratory rats (both strains and breeds) used in such experiments.
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Affiliation(s)
- Máté Marosi
- Department of Comparative Physiology, University of Szeged, H-6726 Szeged, Közép fasor 52, Hungary.
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