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Kovács M, Uzsaly J, Bodzai G, Pap I, Lippai B, Dergez T, Németh A, Gerlinger I, Szanyi I, Bakó P. Efficacy of high dose systemic versus combined (systemic and intratympanic) corticosteroid therapy in idiopathic sudden sensorineural hearing loss: A prospective randomized trial and risk factor analysis. Am J Otolaryngol 2024; 45:104099. [PMID: 37948820 DOI: 10.1016/j.amjoto.2023.104099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Accepted: 10/29/2023] [Indexed: 11/12/2023]
Abstract
The pathophysiology and the proper treatment of idiopathic sudden sensorineural hearing loss (ISSNHL) are an ongoing subject of debate. Locally or systemic administered corticosteroids are the most accepted drugs of treatment in reference to ISSNHL (idiopathic sudden sensorineural hearing loss), however, no strong evidence nor guidelines regarding their effectiveness yet exists. In our prospective, randomized, controlled trial 78 participants were enrolled. Patients were randomly assigned based on the day of admission to two groups according to treatment: group SS (n = 43) received intravenous systemic methylprednisolone alone, and group CT (n = 35) received intratympanic dexamethasone + systemic methylprednisolone. The primary outcome was to compare the hearing outcomes between the treatment groups based on different, widely accepted categories (Siegel, Kanzaki, modified Siegel and PTA4 gain). In consideration of the secondary outcome, we examined the effect of the various risk factors on the hearing improvement. No differences were detected regarding hearing improvement between the two groups, based on any criteria [Siegel's criteria (p = 0.604); Kanzaki's criteria (p = 0.720); modified Siegel's criteria (p = 0.524) and PTA 4 gain (p = 0.569)]. However, several clinical factors such as vertigo (p = 0.039), or cardiovascular comorbidity (p = 0.02) and the severity of initial hearing loss (p = 0.033) were found to bear a significant impact upon the hearing outcome. To the best of our knowledge, this is the first randomized controlled trial comparing high dose systemic and combination corticosteroid therapy in ISSNHL patients. Our findings suggest coexisting cardiovascular comorbidity, vertigo and severity of the initial hearing loss may bear a significantly higher impact upon hearing improvement, than the additional intratympanic steroid administration. The presented trial was registered in the European Union Drug Regulating Authorities Clinical Trials Database (name: Combinated systemic and intratympanic steroid therapy in idiopathic sudden sensorineural hearing loss, No.: 2017-000658-20) and with the ethical approval of The National Institute of Pharmacy and Nutrition (OGYÉI) (protocol No.: 7621, on 2017.02.16.).
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Affiliation(s)
- M Kovács
- University of Pécs, Medical School, Department of Otorhinolaryngology, Munkácsy M St 2, H-7621 Pécs, Hungary
| | - J Uzsaly
- University of Pécs, Medical School, Department of Otorhinolaryngology, Munkácsy M St 2, H-7621 Pécs, Hungary
| | - G Bodzai
- University of Pécs, Medical School, Department of Otorhinolaryngology, Munkácsy M St 2, H-7621 Pécs, Hungary
| | - I Pap
- University of Pécs, Medical School, Department of Otorhinolaryngology, Munkácsy M St 2, H-7621 Pécs, Hungary
| | - B Lippai
- University of Pécs, Szentagothai Research Centre, Ifjuság Str 20, H-7624 Pécs, Hungary
| | - T Dergez
- University of Pécs, Medical School, Institute of Bioanalysis, Honvéd St 1, H-7624 Pécs, Hungary
| | - A Németh
- University of Pécs, Medical School, Department of Otorhinolaryngology, Munkácsy M St 2, H-7621 Pécs, Hungary
| | - I Gerlinger
- University of Pécs, Medical School, Department of Otorhinolaryngology, Munkácsy M St 2, H-7621 Pécs, Hungary
| | - I Szanyi
- University of Pécs, Medical School, Department of Otorhinolaryngology, Munkácsy M St 2, H-7621 Pécs, Hungary.
| | - P Bakó
- University of Pécs, Medical School, Department of Otorhinolaryngology, Munkácsy M St 2, H-7621 Pécs, Hungary; University of Pécs, Szentagothai Research Centre, Ifjuság Str 20, H-7624 Pécs, Hungary
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Zeebone YY, Kovács M, Bóta B, Zdeněk V, Taubner T, Halas V. Dietary fumonisin may compromise the nutritive value of feed and distort copper and zinc digestibility and retention in weaned piglets. J Anim Physiol Anim Nutr (Berl) 2023; 107:504-517. [PMID: 35534935 DOI: 10.1111/jpn.13724] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 03/23/2022] [Accepted: 04/10/2022] [Indexed: 11/26/2022]
Abstract
Fumonisins (FUM) have been reported to impede gut functioning in pigs. However, investigations into the possible effect on mineral metabolism are limited. Thus, the trial studied the apparent total tract digestibility (ATTD) and retention of dietary nitrogen and minerals, intestinal architecture, digestive enzymes activity and heat-shock protein 70 (Hsp70) activity. Eighteen weaned piglets of 7 weeks old were assigned to three groups and their feed either contained 0, 15 or 30 mg FUM/kg for 21 days. ATTD and retention of dietary N and minerals were measured in a 5- day long balance trial between Day 17 and Day 21. The digestible and metabolisable energy (DE and ME) content of the feeds were also determined. The body weights, cumulative feed intake, relative organ weights, digestive enzymes activity and intestinal morphology were not affected (p > 0.05) by dietary treatments. The DE content was significantly lower (p < 0.05) when the feed contained 15 mg/kg FUM, but no statistically reliable treatment effect was confirmed for ME content. Dietary FUM significantly lowered (p < 0.05) the ATTD of Ca and P but not (p > 0.05) N, K, Mg and Na. The relative retention rate of N, Ca, P, K, Mg and Na in all groups were not impacted (p > 0.05) by treatments. The ATTD and relative retention of Cu and Zn were remarkably (p < 0.05) lower in piglets fed FUM-contaminated feed. In addition, the expression of Hsp70 activity in the liver was significantly elevated (p < 0.05) in the highest treatment group. These findings suggest that a dietary dose of 15 or 30 mg FUM/kg diet distorts the nutritive value of the mixed feed, results in poor ATTD and retention rates of Zn and Cu, and elevate Hsp70 activity in the liver without altering intestinal architecture or digestive enzymes' activity in weaned piglets.
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Affiliation(s)
- Y Y Zeebone
- Department of Physiology and Animal Health, Hungarian University of Agriculture and Life Sciences Kaposvár Campus, Kaposvár, Hungary.,MTA-KE-SZIE Mycotoxins in the Food Chain Research Group, Kaposvár, Hungary
| | - M Kovács
- Department of Physiology and Animal Health, Hungarian University of Agriculture and Life Sciences Kaposvár Campus, Kaposvár, Hungary.,MTA-KE-SZIE Mycotoxins in the Food Chain Research Group, Kaposvár, Hungary
| | - B Bóta
- MTA-KE-SZIE Mycotoxins in the Food Chain Research Group, Kaposvár, Hungary
| | - V Zdeněk
- Department of Nutritional Physiology and Animal Product Quality, Institute of Animal Science, Prague, Czechia
| | - T Taubner
- Department of Microbiology, Nutrition and Dietetics, Czech University of Life Sciences, Prague, Czechia
| | - V Halas
- Department of Farm Animal Nutrition, Hungarian University of Agriculture and Life Sciences Kaposvár Campus, Kaposvár, Hungary
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Pirhonen J, Szkalisity Á, Hagström JK, Kim Y, Migh E, Kovács M, Hölttä M, Peränen J, Seppänen H, Haglund C, Gil J, Rezeli M, Malm J, Horvath P, Marko-Varga G, Puolakkainen P, Ikonen E. Lipid metabolic reprogramming extends beyond histological tumor demarcations in operable human pancreatic cancer. Cancer Res 2022; 82:3932-3949. [PMID: 36054547 DOI: 10.1158/0008-5472.can-22-0396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 06/15/2022] [Accepted: 08/30/2022] [Indexed: 11/16/2022]
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is among the deadliest malignancies and potentially curable only with radical surgical resection at early stages. The tumor microenvironment has been shown to be central to the development and progression of PDAC. A better understanding of how early human PDAC metabolically communicates with its environment and differs from healthy pancreas could help improve PDAC diagnosis and treatment. Here we performed deep proteomic analyses from diagnostic specimens of operable, treatment-naïve PDAC patients (n=14), isolating four tissue compartments by laser-capture microdissection: PDAC lesions, tumor-adjacent but morphologically benign exocrine glands, and connective tissues neighboring each of these compartments. Protein and pathway levels were compared between compartments and with control pancreatic proteomes. Selected targets were studied immunohistochemically in the 14 patients and in additional tumor microarrays, and lipid deposition was assessed by non-linear label-free imaging (n=16). Widespread downregulation of pancreatic secretory functions was observed, which was paralleled by high cholesterol biosynthetic activity without prominent lipid storage in the neoplastic cells. Stromal compartments harbored ample blood apolipoproteins, indicating the abundant microvasculature at the time of tumor removal. The features best differentiating the tumor-adjacent exocrine tissue from healthy control pancreas were defined by upregulation of proteins related to lipid transport. Importantly, histologically benign exocrine regions harbored the most significant prognostic pathways, with proteins involved in lipid transport and metabolism, such as neutral cholesteryl ester hydrolase 1, associating with shorter survival. In conclusion, this study reveals the prognostic molecular changes in the exocrine tissue neighboring pancreatic cancer and identifies enhanced lipid transport and metabolism as its defining features.
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Affiliation(s)
| | | | | | - Yonghyo Kim
- Korea Research Institute of Chemical Technology, Daejeon, Korea (South), Republic of
| | - Ede Migh
- Biological Research Centre, Szeged, Hungary
| | | | | | | | | | - Caj Haglund
- University of Helsinki, Helsinki University Central Hospital, Helsinki, Finland
| | | | | | | | | | | | | | - Elina Ikonen
- University of Helsinki, Helsinki, Helsinki, Finland
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Kovács M, Tényi T, Kugyelka R, Prenek L, Herold R, Balogh P, Simon D. Elevated osteopontin and IFNy serum levels and increased neutrophil-to-lymphocyte ratio are associated with the severity of symptoms in schizophrenia. Eur Psychiatry 2022. [PMCID: PMC9567151 DOI: 10.1192/j.eurpsy.2022.302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Introduction Inflammation and immune dysregulation could contribute to the pathogenesis of schizophrenia. Osteopontin (OPN) is a key cytokine-like molecule in cellular immune response and it can directly modulate the cytokine expression and survival of microglia. Furthermore, its mRNA expression is elevated in first episode psychosis. Imbalance of T-helper subtypes could also represent a vulnerability factor for schizophrenia. Objectives The aim of this study was to evaluate the relevance of T-helper subtype associated cytokines, OPN and NLR in the assessment of the severity of schizophrenia. Methods 22 patients with schizophrenia were assessed for the intensity of their symptoms by PANSS and CGI scores. Serum OPN, IFNy, IL-10 and IL-8 concentrations were measured by ELISA kits and NLR was calculated from blood count. Statistical evaluation was performed using Mann-Whitney U test, Student’s t test and Spearman correlation. Results We found significant correlation between the level of OPN and PANSS-total, PANSS-general scores. IFNy level and NLR showed significant correlation with PANSS-total, PANSS-positive, PANSS-general and CGI score. Antipsychotic therapy only had significant effects on NLR and OPN levels, both of which were significantly reduced after long-term antipsychotic treatment. Conclusions Our results indicate that elevated OPN and IFNy concentrations, and increased NLR are associated with severe symptoms in schizophrenia and suggest the importance of Th1 subtype in patients with high PANSS-positive and PANSS-general score. Antipsychotic treatment had significant effects on the level of OPN and NLR, but not on the level of IFNy. Overall our results strengthen the inflammation hypothesis of schizophrenia. Disclosure No significant relationships.
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Csulak T, Hajnal A, Kiss S, Dembrovszky F, Sipos Z, Varjú-Solymár M, Kovács M, Herold M, Varga E, Hegyi P, Tényi T, Herold R. A systematic review and meta-analysis of implicit Theory of Mind in schizophrenia. Eur Psychiatry 2022. [PMCID: PMC9567008 DOI: 10.1192/j.eurpsy.2022.319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Introduction Everyday social interactions are based on Theory of Mind (ToM) or mentalizing, whose complex processes are involved in understanding, representing one’s own and other people’s mental states. ToM is supposed to have two systems. The implicit ToM seems to be a fast, automatic, non-verbal processing. The explicit ToM is characterized by a slower, but more flexible processing, which is mostly verbal, interpretative. Several studies have described explicit ToM deficit in schizophrenic patients. Less research has investigated implicit ToM in patients, however recently, there has been a growing number of articles examining implicit ToM of patients with schizophrenia. Objectives The aim of our systematic review and meta-analysis is to summarize the results of the implicit ToM in schizophrenia. Methods A systematic search was performed in four major databases. We included 11 publications. 7 studies; and 5 studies were included the quantitative synthesis and the qualitative synthesis, respectively. Results We found significant differences in accuracy, reaction time and brain activation patterns during implicit ToM between schizophrenic patients and controls. The systematic review revealed further alterations in visual scanning, cue fixation, face looking time, and difficulties in perspective taking. Conclusions Based on our results implicit ToM is affected in schizophrenia in addition to explicit ToM deficit. However, based on these results we cannot exclude the possibility, that implicit ToM or at least some elements of it might be relatively unaffected (e.g. detection of intentionality), however its effectiveness is limited by non-mentalizing deficits (e.g. certain neurocognitive impairments). Our results may have important implications for the remediation of mentalizing skills. Disclosure The research is supported by the Hungarian National Excellence Centrum Grant (FIKP II) and Hungarian Brain Research Program (KTIA-13-NAP-A-II/12).
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Fahim K, Hausenblas E, Kovács M. Some approximation results for mild solutions of stochastic fractional order evolution equations driven by Gaussian noise. Stoch Partial Differ Equ 2022; 11:1044-1088. [PMID: 37551409 PMCID: PMC10404214 DOI: 10.1007/s40072-022-00250-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 12/22/2021] [Accepted: 03/17/2022] [Indexed: 08/09/2023]
Abstract
We investigate the quality of space approximation of a class of stochastic integral equations of convolution type with Gaussian noise. Such equations arise, for example, when considering mild solutions of stochastic fractional order partial differential equations but also when considering mild solutions of classical stochastic partial differential equations. The key requirement for the equations is a smoothing property of the deterministic evolution operator which is typical in parabolic type problems. We show that if one has access to nonsmooth data estimates for the deterministic error operator together with its derivative of a space discretization procedure, then one obtains error estimates in pathwise Hölder norms with rates that can be read off the deterministic error rates. We illustrate the main result by considering a class of stochastic fractional order partial differential equations and space approximations performed by spectral Galerkin methods and finite elements. We also improve an existing result on the stochastic heat equation.
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Affiliation(s)
- K. Fahim
- Department of Mathematics, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya, 60111 Indonesia
| | - E. Hausenblas
- Department of Mathematics, Montanuniversity Leoben, 8700 Leoben, Austria
| | - M. Kovács
- Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Budapest, Hungary
- Department of Differential Equations, Faculty of Natural Sciences, Budapest University of Technology and Economics, Müegyetem rkp. 3., Budapest 1111, Hungary
- Chalmers University of Technology, Gothenburg, Sweden
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Pintér D, Kovács M, Juhász A, Harmat M, Janszky J, Kovács N. Trimetazidine treatment in Parkinson's Disease: Is it a real problem or just a flame? Parkinsonism Relat Disord 2020. [DOI: 10.1016/j.parkreldis.2020.06.275] [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: 11/27/2022]
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Kovács M, Pintér D, Makkos A, Juhász A, Darnai G, Janszky J, Wittmann I, Kovács N. Relationship between impulse control disorders and preexisting type 2 diabetes mellitus in drug naïve Parkinson's Disease patients. Parkinsonism Relat Disord 2020. [DOI: 10.1016/j.parkreldis.2020.06.096] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kapornai K, Baji I, Benák I, Dochnal R, Dósa E, Kiss E, Merkely B, Prohászka Z, Szabados E, Varga A, Vetró Á, Kovács M. ["Risk factors of childhood depression" research grant - past, present, future]. Psychiatr Hung 2020; 35:46-57. [PMID: 31854322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The authors summarize the last 10 years of an ongoing collaborative study between the Universities of Szeged and Pittsburgh on early onset major depression. First, the "Risk factors of childhood depression" grant is presented briefly as an initial research study in which the subjects of the current studies were recruited. This is a prominently large clinical sample in the field of child psychiatry even on an international level. In addition to the follow-up of the prognosis of the disorder, recent studies continue to explore the early onset depression in two directions. On the one hand, two studies investigate the role of biobehavioral inflexibility markers in the development of major depression ("Biobehavioral inflexibility and risk for juvenile-onset depression" and "Biobehavioral inflexibility and risk for juvenile-onset depression - renewal grant"). On the other hand, the authors would like to have a better understanding of the possible relationship between the major depression and cardiovascular diseases ("Pediatric depression and subsequent cardiac risk factors: a longitudinal study"). The most significant aims of the three studies will be demonstrated, as well as how the studies were prepared and organized along with the already existing experience concerning research management and involvement of new collaborating partners and experts.
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Affiliation(s)
- Krisztina Kapornai
- Szegedi Tudomanyegyetem, Gyermekgyogyaszati Klinika es Gyermekegeszsegugyi Kozpont, Gyermek- es Ifjusagpszichiatriai Osztaly, Szeged, Hungary, E-mail:
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Gyukity-Sebestyén E, Harmati M, Dobra G, Németh IB, Mihály J, Zvara Á, Hunyadi-Gulyás É, Katona R, Nagy I, Horváth P, Bálind Á, Szkalisity Á, Kovács M, Pankotai T, Borsos B, Erdélyi M, Szegletes Z, Veréb ZJ, Buzás EI, Kemény L, Bíró T, Buzás K. Melanoma-Derived Exosomes Induce PD-1 Overexpression and Tumor Progression via Mesenchymal Stem Cell Oncogenic Reprogramming. Front Immunol 2019; 10:2459. [PMID: 31681332 PMCID: PMC6813737 DOI: 10.3389/fimmu.2019.02459] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 10/01/2019] [Indexed: 01/31/2023] Open
Abstract
Recently, it has been described that programmed cell death protein 1 (PD-1) overexpressing melanoma cells are highly aggressive. However, until now it has not been defined which factors lead to the generation of PD-1 overexpressing subpopulations. Here, we present that melanoma-derived exosomes, conveying oncogenic molecular reprogramming, induce the formation of a melanoma-like, PD-1 overexpressing cell population (mMSCPD-1+) from naïve mesenchymal stem cells (MSCs). Exosomes and mMSCPD-1+ cells induce tumor progression and expression of oncogenic factors in vivo. Finally, we revealed a characteristic, tumorigenic signaling network combining the upregulated molecules (e.g., PD-1, MET, RAF1, BCL2, MTOR) and their upstream exosomal regulating proteins and miRNAs. Our study highlights the complexity of exosomal communication during tumor progression and contributes to the detailed understanding of metastatic processes.
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Affiliation(s)
- Edina Gyukity-Sebestyén
- Laboratory of Microscopic Image Analysis and Machine Learning, Institute of Biochemistry, Biological Research Centre of Hungarian Academy of Sciences, Szeged, Hungary
- Doctoral School of Interdisciplinary Sciences, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - Mária Harmati
- Laboratory of Microscopic Image Analysis and Machine Learning, Institute of Biochemistry, Biological Research Centre of Hungarian Academy of Sciences, Szeged, Hungary
- Doctoral School of Interdisciplinary Sciences, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - Gabriella Dobra
- Laboratory of Microscopic Image Analysis and Machine Learning, Institute of Biochemistry, Biological Research Centre of Hungarian Academy of Sciences, Szeged, Hungary
- Doctoral School of Interdisciplinary Sciences, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - István B. Németh
- Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary
| | - Johanna Mihály
- Department of Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Ágnes Zvara
- Laboratory of Functional Genomics, Institute of Genetics, Biological Research Centre of Hungarian Academy of Sciences, Szeged, Hungary
| | - Éva Hunyadi-Gulyás
- Laboratory of Proteomics Research, Institute of Biochemistry, Biological Research Centre of Hungarian Academy of Sciences, Szeged, Hungary
| | - Róbert Katona
- Artificial Chromosome and Stem Cell Research Laboratory, Institute of Genetics, Biological Research Centre of Hungarian Academy of Sciences, Szeged, Hungary
| | - István Nagy
- Sequencing Platform, Institute of Biochemistry, Biological Research Centre of Hungarian Academy of Sciences, Szeged, Hungary
| | - Péter Horváth
- Laboratory of Microscopic Image Analysis and Machine Learning, Institute of Biochemistry, Biological Research Centre of Hungarian Academy of Sciences, Szeged, Hungary
| | - Árpád Bálind
- Laboratory of Microscopic Image Analysis and Machine Learning, Institute of Biochemistry, Biological Research Centre of Hungarian Academy of Sciences, Szeged, Hungary
| | - Ábel Szkalisity
- Laboratory of Microscopic Image Analysis and Machine Learning, Institute of Biochemistry, Biological Research Centre of Hungarian Academy of Sciences, Szeged, Hungary
| | - Mária Kovács
- Laboratory of Microscopic Image Analysis and Machine Learning, Institute of Biochemistry, Biological Research Centre of Hungarian Academy of Sciences, Szeged, Hungary
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - Tibor Pankotai
- Department of Biochemistry and Molecular Biology, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | - Barbara Borsos
- Department of Biochemistry and Molecular Biology, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | - Miklós Erdélyi
- Advanced Optical Imaging Group, Department of Optics and Quantum Electronics, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | - Zsolt Szegletes
- Atomic Force Microscope Laboratory, Institute of Biophysics, Biological Research Centre of Hungarian Academy of Sciences, Szeged, Hungary
| | - Zoltán J. Veréb
- Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary
| | - Edit I. Buzás
- MTA-SE Immuno-proteogenomics Extracellular Vesicle Research Group, Department of Genetics, Cell- and Immunobiology, Faculty of Medicine, Semmelweis University, Budapest, Hungary
| | - Lajos Kemény
- Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary
| | - Tamás Bíró
- Department of Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Krisztina Buzás
- Laboratory of Microscopic Image Analysis and Machine Learning, Institute of Biochemistry, Biological Research Centre of Hungarian Academy of Sciences, Szeged, Hungary
- Department of Oral Biology and Experimental Dental Research, Faculty of Dentistry, University of Szeged, Szeged, Hungary
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Kovács N, Pál E, Weisz AM, Kovács M, Pintér D. Repetitive transcranial magnetic stimulation can improve anxiety in Parkinson’s disease:a randomized, double-blind and controlled trial. Brain Stimul 2019. [DOI: 10.1016/j.brs.2018.12.320] [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: 11/25/2022] Open
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Demeter-Haludka V, Kovács M, Petrus A, Patai R, Muntean DM, Siklós L, Végh Á. Examination of the Role of Mitochondrial Morphology and Function in the Cardioprotective Effect of Sodium Nitrite Administered 24 h Before Ischemia/Reperfusion Injury. Front Pharmacol 2018; 9:286. [PMID: 29643809 PMCID: PMC5882827 DOI: 10.3389/fphar.2018.00286] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [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: 11/15/2017] [Accepted: 03/13/2018] [Indexed: 11/13/2022] Open
Abstract
Background: We have previous evidence that in anesthetized dogs the inorganic sodium nitrite protects against the severe ventricular arrhythmias, resulting from coronary artery occlusion and reperfusion, when administered 24 h before. The present study aimed to examine, whether in this effect changes in mitochondrial morphology and function would play a role. Methods: Thirty dogs were infused intravenously either with saline (n = 15) or sodium nitrite (0.2 μmol/kg/min; n = 15) for 20 min, and 24 h later, 10 dogs from each group were subjected to a 25 min period of occlusion and then reperfusion of the left anterior descending coronary artery. The severity of ischaemia and ventricular arrhythmias were examined in situ. Left ventricular tissue samples were collected either before the occlusion (5 saline and 5 nitrite treated dogs) or, in dogs subjected to occlusion, 2 min after reperfusion. Changes in mitochondrial morphology, in complex I and complex II-dependent oxidative phosphorylation (OXPHOS), in ATP, superoxide, and peroxynitrite productions were determined. Results: The administration of sodium nitrite 24 h before ischemia/reperfusion significantly attenuated the severity of ischaemia, and markedly reduced the number and incidence of ventricular arrhythmias. Nitrite also attenuated the ischaemia and reperfusion (I/R)-induced structural alterations, such as reductions in mitochondrial area, perimeter, and Feret diameter, as well as the increase in mitochondrial roundness. The administration of nitrite, however, enhanced the I/R-induced reduction in the mitochondrial respiratory parameters; compared to the controls, 24 h after the infusion of nitrite, there were further significant decreases, e.g., in the complex I-dependent OXPHOS (by -20 vs. -53%), respiratory control ratio (by -14 vs. -61%) and in the P/E control coupling ratio (by 2 vs. -36%). Nitrite also significantly reduced the I/R-induced generation of superoxide, without substantially influencing the ATP production. Conclusions: The results suggest that sodium nitrite may have an effect on the mitochondria; it preserves the mitochondrial structure and modifies the mitochondrial function, when administered 24 h prior to I/R. We propose that nitrite affects primary the phosphorylation system (indicated by the decreased P/E ratio), and the reduction in superoxide production would result from the subsequent suppression of the ROS producing complexes; an effect which may certainly contribute to the antiarrhythmic effect of nitrite.
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Affiliation(s)
- Vivien Demeter-Haludka
- Department of Pharmacology and Pharmacotherapy, Albert-Szent Györgyi Medical Centre, University of Szeged, Szeged, Hungary
| | - Mária Kovács
- Department of Pharmacology and Pharmacotherapy, Albert-Szent Györgyi Medical Centre, University of Szeged, Szeged, Hungary
| | - Alexandra Petrus
- Department of Pathophysiology, "Victor Babes" University of Medicine and Pharmacy, Timisoara, Romania
| | - Roland Patai
- Department of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Danina M Muntean
- Department of Pathophysiology, "Victor Babes" University of Medicine and Pharmacy, Timisoara, Romania
| | - László Siklós
- Department of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Ágnes Végh
- Department of Pharmacology and Pharmacotherapy, Albert-Szent Györgyi Medical Centre, University of Szeged, Szeged, Hungary
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Szabó A, Szabó-Fodor J, Fébel H, Mézes M, Bajzik G, Kovács M. Oral administration of fumonisin B 1 and T-2 individually and in combination affects hepatic total and mitochondrial membrane lipid profile of rabbits. Physiol Int 2017; 103:321-333. [PMID: 28229635 DOI: 10.1556/2060.103.2016.3.5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Weaned rabbits were fed diets contaminated with 2 mg/kg diet T-2 toxin alone, or 10 mg/kg diet fumonisin B1 (FB1) alone, and both toxins in combination (2 + 10 mg/kg, respectively) compared to a toxin-free control diet. Samplings were performed after 4 weeks (blood and liver). Bodyweight of T-2-fed group was lower after 4 weeks; the liver weight was increased dramatically (threefold of control). Liver total phospholipids (PLs) provided slight alterations in the fatty acid (FA) composition; all three toxin-treated groups showed a decrease in palmitoleic acid (C16:1 n7) proportion. In the liver mitochondrial PL FA composition, margaric acid (C17:0) proportion decreased in the separated toxin treatments compared to the combined setting. Oleic acid (C18:1 n9) proportion was increased and arachidonic acid (C20:4 n6) was decreased in the FB1-treated group, while docosapentaenoic acid (C22:5 n3) was decreased in the separated treatments. The total monounsaturation was significantly higher in the FB1 group's mitochondrial PL FA profile. After 4 weeks, all toxin treatments decreased the blood plasma reduced glutathione and glutathione peroxidase activity, and FB1 increased the plasma sphinganine/sphingosine ratio. Both mycotoxins seem to cross the hepatocellular and the hepatic mitochondrial membrane, without drastic membrane disruption, as assessed from the PL FA composition, but inducing detectable lipid peroxidation.
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Affiliation(s)
- A Szabó
- 1 Institute of Diagnostic Imaging and Radiation Oncology, Kaposvár University , Kaposvár, Hungary.,2 "MTA-KE Mycotoxins in the Food Chain" Research Group, Hungarian Academy of Sciences, Kaposvár University , Kaposvár, Hungary
| | - J Szabó-Fodor
- 2 "MTA-KE Mycotoxins in the Food Chain" Research Group, Hungarian Academy of Sciences, Kaposvár University , Kaposvár, Hungary
| | - H Fébel
- 3 Research Institute for Animal Breeding, Nutrition and Meat Science, National Agricultural Research Center , Herceghalom, Hungary
| | - M Mézes
- 4 Department of Nutrition, Faculty of Agricultural and Environmental Sciences, Szent István University , Gödöllő, Hungary
| | - G Bajzik
- 1 Institute of Diagnostic Imaging and Radiation Oncology, Kaposvár University , Kaposvár, Hungary
| | - M Kovács
- 2 "MTA-KE Mycotoxins in the Food Chain" Research Group, Hungarian Academy of Sciences, Kaposvár University , Kaposvár, Hungary
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14
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Miskolczi G, Gönczi M, Kovács M, Végh Á. Examination of the effect of sodium nitrite on gap junction function during ischaemia and reperfusion in anaesthetized dogs. Acta Biol Hung 2017; 68:35-49. [PMID: 28322085 DOI: 10.1556/018.68.2017.1.4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
It has previously been proved that sodium nitrite, infused prior to coronary artery occlusion or before reperfusion, results in marked antiarrhythmic effect in anaesthetized dogs. We have now examined whether this protection involves the modulation of gap junction (GJ) function by nitric oxide (NO), derived from nitrite administration under ischaemic conditions. Two groups of chloralose and urethane anaesthetized dogs, each containing 13 animals, were subjected to a 25 min period occlusion of the left anterior descending (LAD) coronary artery, followed by reperfusion. One group was infused with sodium nitrite (0.2 μmol/kg/min, i.v.), the other group with saline 10 min prior to reperfusion. The severities of arrhythmias and of ischaemia (epicardial ST-segment, total activation time), parallel with changes in myocardial tissue impedance, a measure of electrical coupling of gap junctions, were assessed during the experiments. Compared to the controls, nitrite infusion administered prior to reperfusion significantly attenuated the severity of ischaemia, the ischaemia-induced impedance changes and, consequently, the severity of arrhythmias, occurring during the 1B phase of the occlusion, and increase survival following reperfusion (0% vs. 85%). It is concluded that the marked antiarrhythmic effect of sodium nitrite is partly due, to the preservation of the electrical coupling of GJs by NO.
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Affiliation(s)
- Gottfried Miskolczi
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Szeged, Dóm tér 12, H-6721 Szeged, Hungary
| | - Márton Gönczi
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Szeged, Dóm tér 12, H-6721 Szeged, Hungary
| | - Mária Kovács
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Szeged, Dóm tér 12, H-6721 Szeged, Hungary
| | - Ágnes Végh
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Szeged, Dóm tér 12, H-6721 Szeged, Hungary
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15
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Szabó-Fodor J, Bors I, Nagy G, Kovács M. Toxicological effects of aflatoxin B1 on the earthworm Eisenia fetida as determined in a contact paper test. Mycotoxin Res 2017; 33:109-112. [DOI: 10.1007/s12550-017-0269-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 01/04/2017] [Accepted: 01/05/2017] [Indexed: 10/20/2022]
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16
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Cullere M, Dalle Zotte A, Celia C, Renteria-Monterrubio A, Gerencsér Z, Szendrő Z, Kovács M, Kachlek M, Matics Z. Effect of Silybum marianum herb on the productive performance, carcass traits and meat quality of growing rabbits. Livest Sci 2016. [DOI: 10.1016/j.livsci.2016.10.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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17
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Ruszinkó V, Kovács M, Szönyi L, Verebély T, Willner P. Cavernous Transformation of the Portal Vein Causing Jaundice, Presenting in the Form of Wilson’s Disease. Acta Chir Belg 2016. [DOI: 10.1080/00015458.2004.11679594] [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: 10/28/2022]
Affiliation(s)
- V. Ruszinkó
- Dept. of Pediatrics, Petz Aladár County Teaching Hospital, Györ ; 1st Dept. of Pediatrics, Semmelweis Medical University, Budapest ; # Dept. of Surgery, Telki Private Hospital, Budapest, Hungary
| | - M. Kovács
- Dept. of Pediatrics, Petz Aladár County Teaching Hospital, Györ ; 1st Dept. of Pediatrics, Semmelweis Medical University, Budapest ; # Dept. of Surgery, Telki Private Hospital, Budapest, Hungary
| | - L. Szönyi
- Dept. of Pediatrics, Petz Aladár County Teaching Hospital, Györ ; 1st Dept. of Pediatrics, Semmelweis Medical University, Budapest ; # Dept. of Surgery, Telki Private Hospital, Budapest, Hungary
| | - T. Verebély
- Dept. of Pediatrics, Petz Aladár County Teaching Hospital, Györ ; 1st Dept. of Pediatrics, Semmelweis Medical University, Budapest ; # Dept. of Surgery, Telki Private Hospital, Budapest, Hungary
| | - P. Willner
- Dept. of Pediatrics, Petz Aladár County Teaching Hospital, Györ ; 1st Dept. of Pediatrics, Semmelweis Medical University, Budapest ; # Dept. of Surgery, Telki Private Hospital, Budapest, Hungary
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18
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Hafner D, Szabó A, D’Costa L, Szabó-Fodor J, Tornyos G, Blochné Bodnár Z, Ölbeiné Horvatovich K, Baloghné Zándoki E, Bóta B, Kovács M. Individual and combined effects of feed artificially contaminated with with fumonisin B1 and T-2 toxin in weaned rabbits. WORLD MYCOTOXIN J 2016. [DOI: 10.3920/wmj2016.2067] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Co-contamination of feed and feed raw materials with two or more mycotoxins is frequently reported, however, only a few studies have investigated the combined effects of low doses of multiple mycotoxins. In the present study the individual and combined effects of 10 mg/kg fumonisin B1 and 2 mg/kg T-2 toxin (n=12/group) were investigated in weaned rabbits. Mycotoxin contaminated feed was produced by adding fungal cultures of Fusarium verticillioides and Fusarium sporotrichioides, and fed to 40 days old rabbits during 28 days. Feed intake and body weight were measured weekly, serum biochemistry and antioxidant parameters on day 0, 14 and 28, while histopathological examination and comet assay were performed at the end of the experiment. T-2 exposure both alone and in combination resulted in 15-18% less final body weight compared to the control and FB1 treatment. There was a significant increase in the concentration of plasma total protein, albumin, fructosamine and creatinine in the group treated with FB1 compared to the control. The liver and the kidney of most animals treated with T-2 toxin, FB1 and their combination showed pathological changes, occurring more frequent in animals exposed to both toxins. T-2 resulted in depletion of lymphocytes in the spleen. FB1 and T-2 exerted synergistic effect on the antioxidant/oxidative parameters after 2 weeks of exposure, manifesting in less glutathione and glutathione peroxidase, while more malondialdehyde was produced. Both toxins caused DNA damage in the lymphocytes, which was more pronounced in the group fed T-2 toxin and T-2 combined with FB1, without additive or synergistic effects.
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Affiliation(s)
- D. Hafner
- Faculty of Agricultural and Environmental Sciences, Kaposvár University, Guba S. 40., Kaposvár 7400, Hungary
| | - A. Szabó
- Institute of Diagnostic Imaging and Radiation Oncology, Kaposvár University, Guba S. 40., Kaposvár 7400, Hungary
| | - L. D’Costa
- MTA-KE Mycotoxins in the Food Chain Research Group, Faculty of Agricultural and Environmental Sciences, Kaposvár University, Guba S. 40., Kaposvár 7400, Hungary
| | - J. Szabó-Fodor
- MTA-KE Mycotoxins in the Food Chain Research Group, Faculty of Agricultural and Environmental Sciences, Kaposvár University, Guba S. 40., Kaposvár 7400, Hungary
| | - G. Tornyos
- Faculty of Agricultural and Environmental Sciences, Kaposvár University, Guba S. 40., Kaposvár 7400, Hungary
| | - Zs. Blochné Bodnár
- Faculty of Agricultural and Environmental Sciences, Kaposvár University, Guba S. 40., Kaposvár 7400, Hungary
| | - K. Ölbeiné Horvatovich
- Faculty of Agricultural and Environmental Sciences, Kaposvár University, Guba S. 40., Kaposvár 7400, Hungary
| | - E. Baloghné Zándoki
- MTA-KE Mycotoxins in the Food Chain Research Group, Faculty of Agricultural and Environmental Sciences, Kaposvár University, Guba S. 40., Kaposvár 7400, Hungary
| | - B. Bóta
- MTA-KE Mycotoxins in the Food Chain Research Group, Faculty of Agricultural and Environmental Sciences, Kaposvár University, Guba S. 40., Kaposvár 7400, Hungary
| | - M. Kovács
- Faculty of Agricultural and Environmental Sciences, Kaposvár University, Guba S. 40., Kaposvár 7400, Hungary
- MTA-KE Mycotoxins in the Food Chain Research Group, Faculty of Agricultural and Environmental Sciences, Kaposvár University, Guba S. 40., Kaposvár 7400, Hungary
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Kovacs N, Deli G, Kovács M, Makkos A, Balás I. EP 42. Bilateral subthalamic deep brain stimulation can help preserve working capabilities in Parkinson’s disease. Clin Neurophysiol 2016. [DOI: 10.1016/j.clinph.2016.05.234] [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: 11/25/2022]
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20
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Szabó-Fodor J, Bors I, Szabó A, Kovács M. Comparison of the amount of bioaccessible fumonisin B1 and B2 in maize and rice inoculated with Fusarium verticillioides (MRC 826) and determined by in vitro digestion-preliminary results. Mycotoxin Res 2016; 32:173-8. [PMID: 27364334 DOI: 10.1007/s12550-016-0252-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Revised: 06/08/2016] [Accepted: 06/09/2016] [Indexed: 11/26/2022]
Abstract
In this study the occurrence of hidden fumonisin B1 (FB1) and fumonisin B2 (FB2) was analysed, on two cereal substrates (maize and rice), inoculated with Fusarium verticillioides (MRC 826), in order to determine the ratio of hidden FB1 and FB2. Two parallel methods were applied: an in vitro human digestion sample pre-treatment and the routine extraction procedure, in both cases with subsequent LC-MS analysis. It was found that all samples showed higher concentration of total fumonisin B1 after digestion, as compared to that of free fumonisin analysed only after extraction. The percentage of the hidden form by maize was 18.8 % (±2.4) for FB1 and 36.8 % (±3.8) for FB2, while for rice it was 32.3 % (±11.3) and 58.0 (±6.8), respectively, expressed as the proportion to total fumonisin B1, for the total dataset. Significant differences were found in the FB1 and FB2 concentration measured after the different digestion phases (saliva, gastric and duodenal) in case of both matrixes. The results are useful for human risk assessment, since both humans and animals may be exposed to markedly higher toxin load, as determined merely by conventional analytical methods.
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Affiliation(s)
- J Szabó-Fodor
- MTA-KE Mycotoxins in the Food Chain Research Group, Kaposvár University, Guba S. 40., Kaposvár, H-7400, Hungary.
| | - I Bors
- MTA-KE Mycotoxins in the Food Chain Research Group, Kaposvár University, Guba S. 40., Kaposvár, H-7400, Hungary
| | - A Szabó
- MTA-KE Mycotoxins in the Food Chain Research Group, Kaposvár University, Guba S. 40., Kaposvár, H-7400, Hungary
- Faculty of Agricultural and Environmental Sciences, Institute of Diagnostic Imaging and Radiation Oncology, Kaposvár University, Kaposvár, Hungary
| | - M Kovács
- MTA-KE Mycotoxins in the Food Chain Research Group, Kaposvár University, Guba S. 40., Kaposvár, H-7400, Hungary
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21
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Celia C, Cullere M, Gerencsér Z, Matics Z, Giaccone V, Kovács M, Bónai A, Szendrő Z, Dalle Zotte A. Dietary supplementation of Digestarom® herbal formulation: effect on apparent digestibility, faecal and caecal microbial counts and live performance of growing rabbits. World Rabbit Sci 2016. [DOI: 10.4995/wrs.2016.4069] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
<p>The experiment aimed to study the effect of Digestarom® dietary inclusion (herbal formulation containing a mixture of essential oils, herbs, spices and extracts) on apparent digestibility and digestive ecosystem of growing rabbits, as well as the effects of its supplementation before and after weaning on growth performance. At kindling, rabbit does and litters were divided into 2 dietary groups (51 does/group) and fed either a control diet (C) or a diet supplemented with 300 mg Digestarom®/kg diet (D) until weaning, which occurred at 35 d (before weaning supplementation). Each group was further divided into 3 dietary groups: CC received the control diet and DD received the D diet from 5 to 12 wk of age, and DC were fed with D (from 5 to 8 wk of age) and C diets (from 8 to 12 wk of age) (after weaning supplementation; 54 kits/group). An in vivo digestibility trial and a faecal microbial count were carried out on growing rabbits that received only the C or D diets during the trial. The C group showed higher DM intake than D group (215 vs. 196 g/d; P<0.05). The faecal digestibility of ether extract (75.9 vs. 59.8%; P<0.001), cellulose (25.9 vs. 20.6%; P<0.05) and gross energy (51.8 vs. 49.1%; P<0.05) was higher for C than for D group, whereas that of starch (98.9 vs. 98.8%; P<0.001) and the digestible protein to digestible energy ratio (13.9 vs. 13.2 g digestible protein/MJ digestible energy; P<0.01) was the highest for rabbits fed D diet. Stomach and caecal pH, caecal and faecal microbial counts were independent of the dietary treatment. The only exception was the stomach pH in 8 wk-old rabbits, which had the lowest value in C rabbits (P<0.05). The D supplementation before weaning improved feed conversion ratio throughout the growing phase (4.3 vs. 4.4 for D and C, respectively; P<0.05), whereas significant differences in daily weight gain, feed conversion ratio and mortality were observed only in the first period after weaning. Based on the results obtained, dietary supplementation with Digestarom® does not seem to confirm the positive results previously reported for growing rabbits.</p>
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Major P, Baczkó I, Hiripi L, Odening KE, Juhász V, Kohajda Z, Horváth A, Seprényi G, Kovács M, Virág L, Jost N, Prorok J, Ördög B, Doleschall Z, Nattel S, Varró A, Bősze Z. A novel transgenic rabbit model with reduced repolarization reserve: long QT syndrome caused by a dominant-negative mutation of the KCNE1 gene. Br J Pharmacol 2016; 173:2046-61. [PMID: 27076034 DOI: 10.1111/bph.13500] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Revised: 03/25/2016] [Accepted: 04/01/2016] [Indexed: 01/26/2023] Open
Abstract
BACKGROUND AND PURPOSE The reliable assessment of proarrhythmic risk of compounds under development remains an elusive goal. Current safety guidelines focus on the effects of blocking the KCNH2/HERG ion channel-in tissues and animals with intact repolarization. Novel models with better predictive value are needed that more closely reflect the conditions in patients with cardiac remodelling and reduced repolarization reserve. EXPERIMENTAL APPROACH We have developed a model for the long QT syndrome type-5 in rabbits (LQT5 ) with cardiac-specific overexpression of a mutant (G52R) KCNE1 β-subunit of the channel that carries the slow delayed-rectifier K(+) -current (IKs ). ECG parameters, including short-term variability of the QT interval (STVQT ), a biomarker for proarrhythmic risk, and arrhythmia development were recorded. In vivo, arrhythmia susceptibility was evaluated by i.v. administration of the IKr blocker dofetilide. K(+) currents were measured with the patch-clamp technique. KEY RESULTS Patch-clamp studies in ventricular myocytes isolated from LQT5 rabbits revealed accelerated IKs and IKr deactivation kinetics. At baseline, LQT5 animals exhibited slightly but significantly prolonged heart-rate corrected QT index (QTi) and increased STVQT . Dofetilide provoked Torsade-de-Pointes arrhythmia in a greater proportion of LQT5 rabbits, paralleled by a further increase in STVQT . CONCLUSION AND IMPLICATIONS We have created a novel transgenic LQT5 rabbit model with increased susceptibility to drug-induced arrhythmias that may represent a useful model for testing proarrhythmic potential and for investigations of the mechanisms underlying arrhythmias and sudden cardiac death due to repolarization disturbances.
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Affiliation(s)
- Péter Major
- Rabbit Genome and Biomodel Group, NARIC - Agricultural Biotechnology Institute, Gödöllő, Hungary
| | - István Baczkó
- Department of Pharmacology & Pharmacotherapy, University of Szeged, Szeged, Hungary
| | - László Hiripi
- Rabbit Genome and Biomodel Group, NARIC - Agricultural Biotechnology Institute, Gödöllő, Hungary
| | - Katja E Odening
- Department of Cardiology and Angiology I, Heart Center University of Freiburg, Freiburg, Germany
| | - Viktor Juhász
- Department of Pharmacology & Pharmacotherapy, University of Szeged, Szeged, Hungary
| | - Zsófia Kohajda
- Department of Pharmacology & Pharmacotherapy, University of Szeged, Szeged, Hungary
| | - András Horváth
- Department of Pharmacology & Pharmacotherapy, University of Szeged, Szeged, Hungary
| | - György Seprényi
- Department of Biology, University of Szeged, Szeged, Hungary
| | - Mária Kovács
- Department of Pharmacology & Pharmacotherapy, University of Szeged, Szeged, Hungary
| | - László Virág
- Department of Pharmacology & Pharmacotherapy, University of Szeged, Szeged, Hungary
| | - Norbert Jost
- Department of Pharmacology & Pharmacotherapy, University of Szeged, Szeged, Hungary.,MTA-SZTE Research Group of Cardiovascular Pharmacology, Hungarian Academy of Sciences, Szeged, Hungary
| | - János Prorok
- Department of Pharmacology & Pharmacotherapy, University of Szeged, Szeged, Hungary
| | - Balázs Ördög
- Department of Pharmacology & Pharmacotherapy, University of Szeged, Szeged, Hungary
| | - Zoltán Doleschall
- Department of Pathogenetics, National Institute of Oncology, Budapest, Hungary
| | - Stanley Nattel
- Department of Medicine, Montreal Heart Institute, Université de Montréal, Canada.,Department of Pharmacology and Therapeutics, McGill University, Montréal, Canada.,Institute of Pharmacology, West German Heart and Vascular Center, Faculty of Medicine, University Duisburg-Essen, Essen, Germany
| | - András Varró
- Department of Pharmacology & Pharmacotherapy, University of Szeged, Szeged, Hungary.,MTA-SZTE Research Group of Cardiovascular Pharmacology, Hungarian Academy of Sciences, Szeged, Hungary
| | - Zsuzsanna Bősze
- Rabbit Genome and Biomodel Group, NARIC - Agricultural Biotechnology Institute, Gödöllő, Hungary
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23
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Kisvári G, Kovács M, Seprényi G, Végh Á. The activation of PI 3-kinase/Akt pathway is involved in the acute effects of simvastatin against ischaemia and reperfusion-induced arrhythmias in anaesthetised dogs. Eur J Pharmacol 2015; 769:185-94. [PMID: 26597117 DOI: 10.1016/j.ejphar.2015.11.016] [Citation(s) in RCA: 6] [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: 07/02/2015] [Revised: 10/01/2015] [Accepted: 11/12/2015] [Indexed: 11/25/2022]
Abstract
The objective of this study was to examine whether the PI3-kinase/Akt pathway is involved in the activation of endothelial nitric oxide synthase (eNOS) and in the subsequent increase of nitric oxide (NO) production that has been proved to play a role in the antiarrhythmic effect of acute simvastatin treatment in anaesthetised dogs, subjected to a 25min occlusion and reperfusion of the left anterior descending coronary artery. Using the same model, 12 dogs out of the 26 controls (given the solvent of simvastatin) and 11 dogs out of the 23 animals treated with intracoronary administered simvastatin (0.1mg/kg), were now received wortmannin (1.5mg/kg, ic.), a selective inhibitor of PI3-kinase. In another 13 dogs the effects of DMSO (0.1%), the vehicle of wortmannin, were examined. Compared to the controls, simvastatin markedly reduced the severity of ischaemia (epicardial ST-segment, inhomogeneity) and ventricular arrhythmias that were reversed (except the occlusion-induced ventricular fibrillation [VF; 50%, 0%, 0%]) by the administration of wortmannin. Thus in these groups there were 310±45, 62±14, 307±59 ectopic beats, 7.1±1.4, 0.3± 0.2, 4.3±1.3 tachycardiac episodes that occurred 93%, 17% and 73% of the dogs during occlusion, whereas survival following reperfusion was 0%, 67% and 0%, respectively. Simvastatin also increased the phosphorylation of eNOS and the plasma nitrate/nitrite levels, but reduced myocardial superoxide production on reperfusion. These effects of simvastatin were also abolished in the presence of wortmannin. We conclude that the NO-dependent antiarrhythmic effect of simvastatin involves the rapid activation of eNOS through the stimulation of the PI3-kinase/Akt pathway.
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Affiliation(s)
- Gábor Kisvári
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Albert-Szent Györgyi Medical Centre, Szeged, Hungary
| | - Mária Kovács
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Albert-Szent Györgyi Medical Centre, Szeged, Hungary
| | - György Seprényi
- Department of Medical Biology, University of Szeged, Albert-Szent Györgyi Medical Centre, Szeged, Hungary
| | - Ágnes Végh
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Albert-Szent Györgyi Medical Centre, Szeged, Hungary.
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24
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Ördög B, Hategan L, Kovács M, Seprényi G, Kohajda Z, Nagy I, Hegedűs Z, Környei L, Jost N, Katona M, Szekeres M, Forster T, Papp JG, Varró A, Sepp R. Identification and functional characterisation of a novel KCNJ2 mutation, Val302del, causing Andersen–Tawil syndrome. Can J Physiol Pharmacol 2015; 93:569-75. [DOI: 10.1139/cjpp-2014-0527] [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] [Indexed: 11/22/2022]
Abstract
Loss-of-function mutations of the KCNJ2 gene encoding for the inward rectifier potassium channel subunit Kir2.1 cause Andersen–Tawil Syndrome (ATS), a rare genetic disorder characterised by periodic paralysis, ventricular arrhythmias, and dysmorphic features. Clinical manifestations of the disease appear to vary greatly with the nature of mutation, therefore, functional characterisation of ATS-causing mutations is of clinical importance. In this study, we describe the identification and functional analysis of a novel KCNJ2 mutation, Val302del, identified in a patient with ATS. Heterologously expressed wild type (WT) and Val302del mutant alleles showed similar subcellular distribution of the Kir2.1 protein with high intensity labelling from the membrane region, demonstrating normal membrane trafficking of the Val302del Kir2.1 variant. Cells transfected with the WT allele displayed a robust current with strong inward rectification, while no current above background was detected in cells expressing the Val302del Kir2.1 subunit. Co-transfection of CHO cells with the WT and the Val302del Kir2.1 revealed a dose-dependent inhibitory effect of the Val302del Kir2.1 mutant subunit on WT Kir2.1 currents. These observations indicate that the WT and the Val302del mutant subunits co-assemble in the cell membrane and that the mutation affects potassium conductivity and (or) gating of the WT/Val302del heteromeric Kir2.1 channels.
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Affiliation(s)
- Balázs Ördög
- Department of Pharmacology and Pharmacotherapy, University of Szeged, H-6720, Szeged, Dóm tér 12, Hungary
| | - Lidia Hategan
- 2nd Department of Internal Medicine and Cardiology Center, University of Szeged, H-6720 Szeged, Korányi fasor 6, Hungary
| | - Mária Kovács
- Department of Pharmacology and Pharmacotherapy, University of Szeged, H-6720, Szeged, Dóm tér 12, Hungary
| | - György Seprényi
- Department of Medical Biology, Faculty of Medicine, University of Szeged, H-6720 Szeged, Somogyi Béla utca 4, Hungary
| | - Zsófia Kohajda
- MTA-SZTE Research Group of Cardiovascular Pharmacology, Hungarian Academy of Sciences, H-6720 Szeged, Dóm tér 12, Hungary
| | - István Nagy
- Institute of Biochemistry, Biological Research Centre of the Hungarian Academy of Sciences, H-6726, Szeged, Temesvári krt. 62, Hungary
| | - Zoltán Hegedűs
- Institute of Biophysics, Bioinformatics Group, Biological Research Centre of the Hungarian Academy of Sciences, H-6726, Szeged, Temesvári krt. 62, Hungary
| | - László Környei
- Division of Pediatric Cardiology, “Gottsegen György” National Institute of Cardiology, 1096 Budapest, Haller utca 29, Hungary
| | - Norbert Jost
- Department of Pharmacology and Pharmacotherapy, University of Szeged, H-6720, Szeged, Dóm tér 12, Hungary
- MTA-SZTE Research Group of Cardiovascular Pharmacology, Hungarian Academy of Sciences, H-6720 Szeged, Dóm tér 12, Hungary
| | - Márta Katona
- Department of Pediatrics, University of Szeged, H-6720 Szeged, Korányi fasor 14-15, Hungary
| | - Miklós Szekeres
- Institute of Plant Biology, Biological Research Centre of the Hungarian Academy of Sciences, H-6726, Szeged, Temesvári krt. 62, Hungary
| | - Tamás Forster
- 2nd Department of Internal Medicine and Cardiology Center, University of Szeged, H-6720 Szeged, Korányi fasor 6, Hungary
| | - Julius Gy. Papp
- MTA-SZTE Research Group of Cardiovascular Pharmacology, Hungarian Academy of Sciences, H-6720 Szeged, Dóm tér 12, Hungary
| | - András Varró
- Department of Pharmacology and Pharmacotherapy, University of Szeged, H-6720, Szeged, Dóm tér 12, Hungary
- MTA-SZTE Research Group of Cardiovascular Pharmacology, Hungarian Academy of Sciences, H-6720 Szeged, Dóm tér 12, Hungary
| | - Róbert Sepp
- 2nd Department of Internal Medicine and Cardiology Center, University of Szeged, H-6720 Szeged, Korányi fasor 6, Hungary
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Miskolczi G, Gönczi M, Kovács M, Seprényi G, Végh Á. Further evidence for the role of gap junctions in the delayed antiarrhythmic effect of cardiac pacing. Can J Physiol Pharmacol 2015; 93:545-53. [PMID: 25943326 DOI: 10.1139/cjpp-2014-0518] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
UNLABELLED The objective of this study was to provide evidence that gap junctions are involved in the delayed antiarrhythmic effect of cardiac pacing. Twenty-four dogs were paced through the right ventricle (4 × 5 min, rate of 240 beats/min) 24 h prior to a 25 min occlusion of the left anterior descending coronary artery. Some of these paced dogs were infused with 50 (n = 7) or 100 μmol/L (n = 7) of the gap junction uncoupler carbenoxolone (CBX), prior to and during the occlusion. Ten sham-paced dogs, subjected only to occlusion, served as the controls. Cardiac pacing markedly reduced the number of ectopic beats and episodes of ventricular tachycardia (VT), as well the incidence of VT and ventricular fibrillation during occlusion. The changes in severity of ischaemia and tissue electrical resistance were also less marked compared with the unpaced controls. Pacing also preserved the permeability of gap junctions, the phosphorylation of connexin43, and the structural integrity of the intercalated discs. The closing of gap junctions with CBX prior to and during ischaemia markedly attenuated or even abolished these protective effects of pacing. CONCLUSION Our results support the previous findings that gap junctions play a role in the delayed antiarrhythmic effect of cardiac pacing.
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Affiliation(s)
- Gottfried Miskolczi
- a Department of Pharmacology and Pharmacotherapy, University of Szeged, 6720 Szeged, Dóm tér 12, Hungary
| | - Márton Gönczi
- a Department of Pharmacology and Pharmacotherapy, University of Szeged, 6720 Szeged, Dóm tér 12, Hungary
| | - Mária Kovács
- a Department of Pharmacology and Pharmacotherapy, University of Szeged, 6720 Szeged, Dóm tér 12, Hungary
| | - György Seprényi
- b Department of Medical Biology, University of Szeged, Szeged, Hungary
| | - Ágnes Végh
- a Department of Pharmacology and Pharmacotherapy, University of Szeged, 6720 Szeged, Dóm tér 12, Hungary
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Kovács M, Kiss A, Gönczi M, Miskolczi G, Seprényi G, Kaszaki J, Kohr MJ, Murphy E, Végh Á. Effect of sodium nitrite on ischaemia and reperfusion-induced arrhythmias in anaesthetized dogs: is protein S-nitrosylation involved? PLoS One 2015; 10:e0122243. [PMID: 25909651 PMCID: PMC4409072 DOI: 10.1371/journal.pone.0122243] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Accepted: 02/18/2015] [Indexed: 11/21/2022] Open
Abstract
Background and Purpose To provide evidence for the protective role of inorganic nitrite against acute ischaemia and reperfusion-induced ventricular arrhythmias in a large animal model. Experimental Approach Dogs, anaesthetized with chloralose and urethane, were administered intravenously with sodium nitrite (0.2 µmolkg-1min-1) in two protocols. In protocol 1 nitrite was infused 10 min prior to and during a 25 min occlusion of the left anterior descending (LAD) coronary artery (NaNO2-PO; n = 14), whereas in protocol 2 the infusion was started 10 min prior to reperfusion of the occluded vessel (NaNO2-PR; n = 12). Control dogs (n = 15) were infused with saline and subjected to the same period of ischaemia and reperfusion. Severities of ischaemia and ventricular arrhythmias, as well as changes in plasma nitrate/nitrite (NOx) levels in the coronary sinus blood, were assessed throughout the experiment. Myocardial superoxide and nitrotyrosine (NT) levels were determined during reperfusion. Changes in protein S-nitrosylation (SNO) and S-glutathionylation were also examined. Key Results Compared with controls, sodium nitrite administered either pre-occlusion or pre-reperfusion markedly suppressed the number and severity of ventricular arrhythmias during occlusion and increased survival (0% vs. 50 and 92%) upon reperfusion. There were also significant decreases in superoxide and NT levels in the nitrite treated dogs. Compared with controls, increased SNO was found only in NaNO2-PR dogs, whereas S-glutathionylation occurred primarily in NaNO2-PO dogs. Conclusions Intravenous infusion of nitrite profoundly reduced the severity of ventricular arrhythmias resulting from acute ischaemia and reperfusion in anaesthetized dogs. This effect, among several others, may result from an NO-mediated reduction in oxidative stress, perhaps through protein SNO and/or S-glutathionylation.
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Affiliation(s)
- Mária Kovács
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - Attila Kiss
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - Márton Gönczi
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - Gottfried Miskolczi
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - György Seprényi
- Department of Medical Biology, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - József Kaszaki
- Institute of Surgical Research, Albert Szent-Györgyi Medical Center, University of Szeged, Szeged, Hungary
| | - Mark J Kohr
- Systems Biology Center, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Elizabeth Murphy
- Systems Biology Center, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Ágnes Végh
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Szeged, Szeged, Hungary
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Kovács M, Németh T, Jakus Z, Sitaru C, Simon E, Futosi K, Botz B, Helyes Z, CA L, Mócsai A. A2.21 The role of HCK, FGR and LYN in in vivoinflammation in mice. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-207259.56] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Szabó-Fodor J, Dall'Asta C, Falavigna C, Kachlek M, Szécsi Á, Szabó A, Kovács M. Determination of the amount of bioaccessible fumonisin B1 in different matrices after in vitro digestion. WORLD MYCOTOXIN J 2015. [DOI: 10.3920/wmj2014.1771] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Conventional analytical methods used for the analysis of fumonisin content in animal feeds fail to take into account the fumonisin content bound to the matrix, which is otherwise bioaccessible and can be absorbed from the gastrointestinal tract. Moreover, underestimation of fumonisin content using routine analytical methods can affect animal experiments using cereals contaminated by fungi. In the present study, hidden fumonisin B1 was analysed in two cereal substrates (maize and wheat) which were inoculated with Fusarium verticillioides (MRC 826). The study compared a routine extraction procedure with an in vitro digestion sample pre-treatment. We found that all samples showed a higher content of fumonisin B1 after digestion, compared to the free fumonisin obtained only by extraction. The percentage of the hidden form was 38.6% (±18.5) in maize and 28.3% (±17.8) in wheat, expressed as the proportion of total fumonisin B1. These results indicate that the toxin exposure of the animals determined by the routine fumonisin analysis was underestimated, generally by 40%, as bioaccessibility was not taken into consideration. This is crucial in interpretation (and maybe in re-evaluation) of the results obtained from (other) animal experiments.
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Affiliation(s)
- J. Szabó-Fodor
- MTA-KE Mycotoxins in the Food Chain Research Group, Kaposvár University, Faculty of Agricultural and Environmental Sciences, Guba S. 40., 7400 Kaposvár, Hungary
| | - C. Dall'Asta
- Department of Food Science, University of Parma, Viale G.P. Usberti 17/a, 43124 Parma, Italy
| | - C. Falavigna
- Department of Food Science, University of Parma, Viale G.P. Usberti 17/a, 43124 Parma, Italy
| | - M. Kachlek
- MTA-KE Mycotoxins in the Food Chain Research Group, Kaposvár University, Faculty of Agricultural and Environmental Sciences, Guba S. 40., 7400 Kaposvár, Hungary
| | - Á. Szécsi
- Plant Protection Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, P.O. Box 102, 1525 Budapest, Hungary
| | - A. Szabó
- MTA-KE Mycotoxins in the Food Chain Research Group, Kaposvár University, Faculty of Agricultural and Environmental Sciences, Guba S. 40., 7400 Kaposvár, Hungary
| | - M. Kovács
- MTA-KE Mycotoxins in the Food Chain Research Group, Kaposvár University, Faculty of Agricultural and Environmental Sciences, Guba S. 40., 7400 Kaposvár, Hungary
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Belák Á, Héher B, Füstös Z, Kovács M, Maráz A. Endophytic bacteria fromCapsicum annuumvar.grossumcultivars and their inhibitory effects onListeria monocytogenes. Acta Alimentaria 2014. [DOI: 10.1556/aalim.43.2014.suppl.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Kisvári G, Kovács M, Gardi J, Seprényi G, Kaszaki J, Végh Á. The effect of acute simvastatin administration on the severity of arrhythmias resulting from ischaemia and reperfusion in the canine: Is there a role for nitric oxide? Eur J Pharmacol 2014; 732:96-104. [DOI: 10.1016/j.ejphar.2014.03.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 03/14/2014] [Accepted: 03/21/2014] [Indexed: 02/09/2023]
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Jost N, Virág L, Comtois P, Ordög B, Szuts V, Seprényi G, Bitay M, Kohajda Z, Koncz I, Nagy N, Szél T, Magyar J, Kovács M, Puskás LG, Lengyel C, Wettwer E, Ravens U, Nánási PP, Papp JG, Varró A, Nattel S. Ionic mechanisms limiting cardiac repolarization reserve in humans compared to dogs. J Physiol 2013; 591:4189-206. [PMID: 23878377 DOI: 10.1113/jphysiol.2013.261198] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The species-specific determinants of repolarization are poorly understood. This study compared the contribution of various currents to cardiac repolarization in canine and human ventricle. Conventional microelectrode, whole-cell patch-clamp, molecular biological and mathematical modelling techniques were used. Selective IKr block (50-100 nmol l(-1) dofetilide) lengthened AP duration at 90% of repolarization (APD90) >3-fold more in human than dog, suggesting smaller repolarization reserve in humans. Selective IK1 block (10 μmol l(-1) BaCl2) and IKs block (1 μmol l(-1) HMR-1556) increased APD90 more in canine than human right ventricular papillary muscle. Ion current measurements in isolated cardiomyocytes showed that IK1 and IKs densities were 3- and 4.5-fold larger in dogs than humans, respectively. IKr density and kinetics were similar in human versus dog. ICa and Ito were respectively ~30% larger and ~29% smaller in human, and Na(+)-Ca(2+) exchange current was comparable. Cardiac mRNA levels for the main IK1 ion channel subunit Kir2.1 and the IKs accessory subunit minK were significantly lower, but mRNA expression of ERG and KvLQT1 (IKr and IKs α-subunits) were not significantly different, in human versus dog. Immunostaining suggested lower Kir2.1 and minK, and higher KvLQT1 protein expression in human versus canine cardiomyocytes. IK1 and IKs inhibition increased the APD-prolonging effect of IKr block more in dog (by 56% and 49%, respectively) than human (34 and 16%), indicating that both currents contribute to increased repolarization reserve in the dog. A mathematical model incorporating observed human-canine ion current differences confirmed the role of IK1 and IKs in repolarization reserve differences. Thus, humans show greater repolarization-delaying effects of IKr block than dogs, because of lower repolarization reserve contributions from IK1 and IKs, emphasizing species-specific determinants of repolarization and the limitations of animal models for human disease.
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Affiliation(s)
- Norbert Jost
- A. Varró: Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Szeged, H-6720 Szeged, Dóm tér 12, PO Box 427, Hungary.
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Végh A, Gönczi M, Miskolczi G, Kovács M. Regulation of gap junctions by nitric oxide influences the generation of arrhythmias resulting from acute ischemia and reperfusion in vivo. Front Pharmacol 2013; 4:76. [PMID: 23785332 PMCID: PMC3682124 DOI: 10.3389/fphar.2013.00076] [Citation(s) in RCA: 8] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Accepted: 05/29/2013] [Indexed: 11/13/2022] Open
Abstract
Myocardial ischemia resulting from sudden occlusion of a coronary artery is one of the major causes in the appearance of severe, often life-threatening ventricular arrhythmias. Although the underlying mechanisms of these acute arrhythmias are many and varied, there is no doubt that uncoupling of gap junctions (GJs) play an important role especially in arrhythmias that are generated during phase Ib, and often terminate in sudden cardiac death. In the past decades considerable efforts have been made to explore mechanisms which regulate the function of GJs, and to find new approaches for protection against arrhythmias through the modulation of GJs. These investigations led to the development of GJ openers and inhibitors. The pharmacological modulation of GJs, however, resulted in conflicting results. It is still not clear whether opening or closing of GJs would be advantageous for the ischemic myocardium. Both maneuvers can result in protection, depending on the models, endpoints and the time of opening and closing of GJs. Furthermore, although there is substantial evidence that preconditioning decreases or delays the uncoupling of GJs, the precise mechanisms by which this attains have not yet been elucidated. In our own studies in anesthetized dogs preconditioning suppressed the ischemia and reperfusion-induced ventricular arrhythmias, and this protection was associated with the preservation of GJ function, manifested in less marked changes in electrical impedance, as well as in the maintenance of GJ permeability and phosphorylation of connexin43. Since we have substantial previous evidence that nitric oxide (NO) is an important trigger and mediator of the preconditioning-induced antiarrhythmic protection, we hypothesized that NO, among its several effects, may lead to this protection by influencing cardiac GJs. The hypotheses and theories relating to the pharmacological modulation of GJs will be discussed with particular attention to the role of NO.
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Affiliation(s)
- Agnes Végh
- Department of Pharmacology and Pharmacotherapy, University of Szeged Szeged, Hungary
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33
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Pósa R, Magyar T, Stoev SD, Glávits R, Donkó T, Repa I, Kovács M. Use of computed tomography and histopathologic review for lung lesions produced by the interaction between Mycoplasma hyopneumoniae and fumonisin mycotoxins in pigs. Vet Pathol 2013; 50:971-9. [PMID: 23456966 DOI: 10.1177/0300985813480510] [Citation(s) in RCA: 20] [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] [Indexed: 11/16/2022]
Abstract
Mycoplasma hyopneumoniae has a primary role in the porcine respiratory disease complex (PRDC). The objective of this study was to determine whether fumonisin mycotoxins influence the character and/or the severity of pathological processes induced in the lungs of pigs by Mycoplasma hyopneumoniae. Four groups of pigs (n = 7/group) were used, one fed 20 ppm fumonisin B1 (FB1) from 16 days of age (group F), one only infected with M. hyopneumoniae on study day 30 (group M), and a group fed FB1 and infected with M. hyopneumoniae (group MF), along with an untreated control group (group C). Computed tomography (CT) scans of infected pigs (M and MF) on study day 44 demonstrated lesions extending to the cranial and middle or in the cranial third of the caudal lobe of the lungs. The CT images obtained on study day 58 showed similar but milder lesions in 5 animals from group M, whereas lungs from 2 pigs in group MF appeared progressively worse. The evolution of average pulmonary density calculated from combined pixel frequency values, as measured by quantitative CT, was significantly influenced by the treatment and the age of the animals. The most characteristic histopathologic lesion in FB1-treated pigs was pulmonary edema, whereas the pathomorphological changes in Mycoplasma-infected pigs were consistent with catarrhal bronchointerstitial pneumonia. FB1 aggravated the progression of infection, as demonstrated by severe illness requiring euthanasia observed in 1 pig and evidence of progressive pathology in 2 pigs (group MF) between study days 44 and 58.
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Affiliation(s)
- R Pósa
- Kaposvár University, Guba Sándor u. 40, H-7400 Kaposvár, Hungary. kovacs.melinda@ke
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Kovács M, Németh T, Futosi K, Jakus Z, Sitaru C, Mócsai A. A2.22 Tyrosine Phosphorylation Pathways in Myeloid Cell-Mediated Inflammatory Diseases. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-203215.22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Skaliczki G, Weszl M, Schandl K, Major T, Kovács M, Skaliczki J, Redl H, Szendrői M, Szigeti K, Máté D, Dobó-Nagy C, Lacza Z. Compromised bone healing following spacer removal in a rat femoral defect model. ACTA ACUST UNITED AC 2012; 99:223-32. [DOI: 10.1556/aphysiol.99.2012.2.16] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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36
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Kiss A, Gönczi M, Kovács M, Seprényi G, Kaszaki J, Végh Á. P4. Effect of sodium nitrite on ischemia-reperfusion induced ventricular arrhythmias in anaesthetized dogs. Nitric Oxide 2011. [DOI: 10.1016/j.niox.2011.03.235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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37
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Belák Á, Kovács M, Hermann Z, Holczman Á, Márta D, Stojakovič S, Bajcsi N, Maráz A. Molecular analysis of poultry meat spoiling microbiota and heterogeneity of their proteolytic and lipolytic enzyme activities. Acta Alimentaria 2011. [DOI: 10.1556/aalim.40.2011.suppl.2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Kovács M, Papp R, Varga-Orvos Z, Ménesi D, Puskás LG, Végh A. Changes in gene expression following cardiac pacing-induced delayed cardioprotection in the canine heart. Acta Biol Hung 2010; 61:434-48. [PMID: 21112835 DOI: 10.1556/abiol.61.2010.4.7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The aim of the present study was to identify gene expression changes in the rapid cardiac pacing-induced delayed antiarrhythmic protection in the canine, using cDNA microarrays and quantitative real-time PCR (QRT -PCR) techniques. In all dogs under light pentobarbitone anaesthesia, a pacing electrode was introduced into the right ventricle, and then the animals were divided into three groups: (1) sham-operated and sham-paced group (SP, n = 3) (2) ischaemic control group (IC; n = 3); these were without cardiac pacing and subjected only to a 25 min occlusion of the left anterior descending coronary artery (LAD), and (3) paced group (PC, n = 3); these animals were paced at a rate of 220-240 beats min-1 24 h prior to ischaemia. With cDNA chip 23 genes were found with altered expression in response to rapid cardiac pacing and 10 genes in the IC group when compared to SP dogs. These genes encode transcription factors (MEF2); members of signaling pathways (TGFβ2, PDE4D9), hormone related proteins (e.g. vasopressin V1 and V2 receptors). RT-QPCR was used either to confirm the results of the microarray analysis and also to study 46 genes which are already known to have a role in the late phase of PC. By this method 17 genes were up-regulated and 6 genes down-regulated in the IC group; their expression ratios changed either to the opposite or showed no alteration after cardiac pacing. This study would add some new information about those transcriptional changes that are involved in the delayed phase of cardiac protection.
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Affiliation(s)
- Mária Kovács
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Szeged, Szeged, Hungary
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Bónai A, Szendrő Z, Matics Z, Fébel H, Kametler L, Tornyos G, Horn P, Kovács F, Kovács M. Effect of inulin supplementation and age on growth performance and digestive physiological parameters in weaned rabbits. World Rabbit Sci 2010. [DOI: 10.4995/wrs.2010.5883] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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40
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Hegyi A, Urbányi B, Kovács M, Lefler KK, Gál J, Hoitsy G, Horváth A. Investigation of potential stress parameters in rainbow trout (Oncorhynchus mykiss). Acta Biol Hung 2010; 61:24-32. [PMID: 20194096 DOI: 10.1556/abiol.61.2010.1.3] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The transportation of rainbow trout in the presence of the anesthetic clove oil was investigated. Before the transportation tests, an acute experiment was conducted to verify that removal of the fish from the water for one minute does not significantly increase the glucose or cortisol concentration of the blood plasma. In the main experiment two different transportation conditions were compared: transport in water only and in water with anesthetic. During transportation without addition of clove oil, blood plasma glucose and cortisol concentrations changed significantly. The concentration of glucose increased from 4.92 mmol/L prior to transportation to 6.16 mmol/L and values similar to the initial ones (4.95 mmol/L) were observed 5 hours after transportation. Concentration of the stress hormone cortisol increased from the initial 37.2 ng/mL to 89.2 ng/mL and returned to a value of 36.1 ng/mL 3 hours post transportation. Respective values of glucose concentration have not changed significantly during transportation in the presence of clove oil (4.3; 4.4; 4.4 mmol/L), whereas those of cortisol showed a slight decrease with the passing of time (28.1; 26.7; 20.18 ng/mL). Results show that transportation stress can significantly be reduced by the use of anesthetics.
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Affiliation(s)
- A Hegyi
- Department of Aquaculture, Institute of Environmental and Landscape Management, Faculty of Agricultural and Environmental Sciences, Szent István University, Páter Károly u. 1, H-2103 Gödöllo, Hungary.
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Raekallio J, Kovács M, Mäkinen PL. The appearance of oxidoreductases in healing fractures. Acta Pathol Microbiol Scand A 2009; 78:658-64. [PMID: 4322542 DOI: 10.1111/j.1699-0463.1970.tb03517.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Kovács M, Pák P, Pák G, Oláh A, Rácz I. The Impact of Capsule Endoscopy on Surgical Results in Patients with Obscure Gastrointestinal Bleeding. Z Gastroenterol 2009; 47:424-8. [DOI: 10.1055/s-2008-1027983] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Aladzsity I, Kovács M, Semsei A, Falus A, Szilágyi A, Karádi I, Varga G, Füst G, Várkonyi J. Comparative analysis of IL6 promoter and receptor polymorphisms in myelodysplasia and multiple myeloma. Leuk Res 2009; 33:1570-3. [PMID: 19406470 DOI: 10.1016/j.leukres.2009.03.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [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: 11/28/2008] [Revised: 02/13/2009] [Accepted: 03/09/2009] [Indexed: 12/27/2022]
Abstract
The serum levels of interleukin 6 (IL6) are known to be elevated in two diseases of the elderly age, myelodysplastic syndrome (MDS) and multiple myeloma (MM). Authors suppose that one of the possible causes of this elevation could be a difference between these patients and healthy subjects in the frequency of polymorphic variants of the genes regulating IL6 levels. Scarce and contradictory comparative data are available for MM and to our best knowledge this is the first study on IL6 promoter and IL6 receptor (IL6R) polymorphism in MDS. Therefore we determined the Asp358Ala polymorphism of the IL6 receptor gene and the -174 G>C promoter polymorphism of the IL6 gene in blood samples of 102 MDS and 100 MM patients and 99 age- and sex-matched hospitalized controls had been tested for this purpose as well. There was no significant difference between patients with either disease and controls regarding IL6 promoter/L-6R. Authors therefore assume other mechanisms causing high IL6 levels are not related to either of these polymorphisms. Moreover authors consider important to propose a hypothesis how elements of signal transduction in iron metabolism might be involved in the development of MM and MDS in elderly age.
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Affiliation(s)
- I Aladzsity
- 3rd Department of Internal Medicine, Semmelweis University, 1125 Budapest, Hungary
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Gönczi M, Papp R, Kovács M, Seprényi G, Végh A. Modulation of gap junctions by nitric oxide contributes to the anti-arrhythmic effect of sodium nitroprusside? Br J Pharmacol 2009; 156:786-93. [PMID: 19239476 DOI: 10.1111/j.1476-5381.2008.00089.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND AND PURPOSE Nitric oxide (NO) donors provide a preconditioning-like anti-arrhythmic protection in the anaesthetized dog. As NO may modulate gap junction (GJ) function, the present study investigated whether this anti-arrhythmic effect is due to a modification of GJs by NO, derived from the NO donor sodium nitroprusside (SNP). EXPERIMENTAL APPROACH In chloralose-urethane-anaesthetized, open-chest dogs, either saline (controls; n= 11) or SNP (0.2 microg x kg(-1) x min(-1); n= 10) was infused at a rate of 0.5 mL x min(-1) by the intracoronary route. The infusions were started 20 min prior to and maintained throughout the entire 60 min occlusion period of the left anterior descending coronary artery. The severity of ischaemia and of arrhythmias, tissue electrical impedance and permeability, as well as the phosphorylation of connexin43, were assessed. KEY RESULTS Compared with the controls, SNP infusion markedly suppressed the total number of ventricular premature beats (666 +/- 202 vs. 49 +/- 18; P < 0.05), and the number of ventricular tachycardiac episodes (8.1 +/- 2.3 vs. 0.2 +/- 0.1; P < 0.05) without significantly modifying the incidence of ventricular tachycardia or ventricular fibrillation. The severity of ischaemia (epicardial ST-segment changes, inhomogeneity of electrical activation) and tissue electrical impedance changes were significantly less in the SNP-treated dogs. SNP improved GJ permeability and preserved the phosphorylated form of connexin43. CONCLUSION AND IMPLICATIONS The anti-arrhythmic protection resulting from SNP infusion in the anaesthethized dog may, in part, be associated with the modulation of gap junctional function by NO.
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Affiliation(s)
- Márton Gönczi
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Albert Szent-Györgyi Faculty of Medicine, Szeged, Hungary.
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Vetró A, Baji I, Benák I, Besnyo M, Csorba J, Daróczy G, Dombóvári E, Kiss E, Gádoros J, Kaczvinszky E, Kapornai K, Mayer L, Rimay T, Skultéty D, Szabó K, Tamás Z, Székely J, Kovács M. ["Risk factors for childhood depression"--research design, implementation, proceedings: history of 13 years: experience in grant preparation, writing, organization in connection with an American NIMH Grant]. Psychiatr Hung 2009; 24:6-17. [PMID: 19542566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The authors summarize their experiences in research organization accumulated during 13 years. At first they outline preliminary studies which are prerequisites of high prestige international grants. Then they describe the huge administrative apparatus dedicated - besides skilled professionals - for the construction and organization of the research, the management, continuous checking and evaluation of data in such a multisite study. Finally, they report on the scientific results obtained after 13 years of hard work.
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Affiliation(s)
- Agnes Vetró
- SZTE AOK Gyermek- és Ifjuságpszichiátriai Osztály, Szeged, Hungary. 6725 Szeged, Boldogasszony sgt. 15.
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Fodor J, Balogh K, Weber M, Mézes M, Kametler L, Pósa R, Mamet R, Bauer J, Horn P, Kovács F, Kovács M. Absorption, distribution and elimination of fumonisin B1metabolites in weaned piglets. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2007; 25:88-96. [DOI: 10.1080/02652030701546180] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- J. Fodor
- a Research Group of Animal Breeding and Animal Hygiene, Faculty of Animal Science , University of Kaposvár , H-7400 Kaposvár, Hungary
| | - K. Balogh
- a Research Group of Animal Breeding and Animal Hygiene, Faculty of Animal Science , University of Kaposvár , H-7400 Kaposvár, Hungary
| | - M. Weber
- c Department of Nutrition , Szent István University , H-2103 Gödöllő, Hungary
| | - M. Mézes
- a Research Group of Animal Breeding and Animal Hygiene, Faculty of Animal Science , University of Kaposvár , H-7400 Kaposvár, Hungary
- c Department of Nutrition , Szent István University , H-2103 Gödöllő, Hungary
| | - L. Kametler
- b Faculty of Animal Science, University of Kaposvár , H-7400 Kaposvár, Hungary
| | - R. Pósa
- b Faculty of Animal Science, University of Kaposvár , H-7400 Kaposvár, Hungary
| | - R. Mamet
- d Technische Universität München, Lehrstuhl für Tierhygiene , D-85350 Freising, Germany
| | - J. Bauer
- d Technische Universität München, Lehrstuhl für Tierhygiene , D-85350 Freising, Germany
| | - P. Horn
- a Research Group of Animal Breeding and Animal Hygiene, Faculty of Animal Science , University of Kaposvár , H-7400 Kaposvár, Hungary
- b Faculty of Animal Science, University of Kaposvár , H-7400 Kaposvár, Hungary
| | - F. Kovács
- a Research Group of Animal Breeding and Animal Hygiene, Faculty of Animal Science , University of Kaposvár , H-7400 Kaposvár, Hungary
- b Faculty of Animal Science, University of Kaposvár , H-7400 Kaposvár, Hungary
| | - M. Kovács
- a Research Group of Animal Breeding and Animal Hygiene, Faculty of Animal Science , University of Kaposvár , H-7400 Kaposvár, Hungary
- b Faculty of Animal Science, University of Kaposvár , H-7400 Kaposvár, Hungary
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Bodorkós I, Aleksza M, Horváth E, Dancza T, Farkas A, Gy¨ork¨os A, Kovács M, Tiboly M, Tóth P, Gasztonyi B. P099 Haemotherapy and its serological aspects of patients suffering from immunohaematological diseases. Blood Rev 2007. [DOI: 10.1016/s0268-960x(07)70177-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Gönczi M, Papp R, Kovács M, Seprényi G, Végh Á. Molecular evidence for the role of gap junctions in the antiarrhythmic effect of preconditioning. J Mol Cell Cardiol 2007. [DOI: 10.1016/j.yjmcc.2007.03.533] [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: 11/30/2022]
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Papp R, Gönczi M, Kovács M, Seprényi G, Végh A. Gap junctional uncoupling plays a trigger role in the antiarrhythmic effect of ischaemic preconditioning. Cardiovasc Res 2007; 74:396-405. [PMID: 17362896 DOI: 10.1016/j.cardiores.2007.02.021] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2006] [Revised: 02/14/2007] [Accepted: 02/16/2007] [Indexed: 11/30/2022] Open
Abstract
OBJECTIVE The aim of this study was to determine whether uncoupling of gap junctions (GJ) prior to ischaemia would modify the antiarrhythmic effect of ischaemic preconditioning (PC) in a canine model of ischaemia/reperfusion. METHODS Twenty control dogs, anaesthetised with chloralose and urethane, were thoracotomised and subjected either to a 25 or a 60 min occlusion of the left anterior descending (LAD) coronary artery. This prolonged ischaemia was preceded 20 min earlier by a single 5 min LAD occlusion in preconditioned dogs (PC group; n=14) or by a 20 min intracoronary infusion of 50 microM carbenoxolone (CBX group; n=15), a relatively selective uncoupler of gap junctions. CBX was also infused in PC dogs (CBX+PC group; n=11). The severity of ischaemia (epicardial ST-segment changes, inhomogeneity of electrical activation) and of ventricular arrhythmias, such as ventricular premature beats (VPBs), ventricular tachycardiac (VT) episodes and ventricular fibrillation (VF), as well as changes in electrical impedance was assessed throughout the experiments. Connexin 43 (Cx43) phosphorylation and GJ permeability were determined at the end of the occlusion periods. RESULTS Compared to the controls PC and, interestingly, CBX markedly reduced, e.g. the total number of VPBs (440+/-104 vs 47+/-11 and 60+/-15; P<0.05) during the prolonged occlusion. This protection was, however, attenuated when CBX was infused in PC dogs (VPBs: 203+/-32). Changes in electrical impedance, GJ permeability and Cx43 dephosphorylation were significantly less in the PC and CBX groups than in the controls but these were again increased in the CBX+PC group. CONCLUSIONS Uncoupling of GJs prior to ischaemia either by PC or CBX preserves the electrical coupling of cells and results in an antiarrhythmic effect during a subsequent ischaemic insult, indicating that a partial closure of gap junctions may play a trigger role in the protection. In contrast, when CBX is administered in PC dogs the protection both against GJ uncoupling and arrhythmias is markedly attenuated, suggesting that the antiarrhythmic protection, at least in part, is mediated through GJs.
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Affiliation(s)
- Rita Papp
- Department of Pharmacology and Pharmacotherapy, University of Szeged, 6720 Szeged, Dóm tér 12, Hungary
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Seprényi G, Papp R, Kovács M, Acsai K, Végh Á, Varró A. Quantification of the surface expression of ionchannel and gap junction proteins on cardiac myocytes with confocal microscopy. J Mol Cell Cardiol 2006. [DOI: 10.1016/j.yjmcc.2006.03.180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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