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Barabási B, Barna L, Santa-Maria AR, Harazin A, Molnár R, Kincses A, Vigh JP, Dukay B, Sántha M, Tóth ME, Walter FR, Deli MA, Hoyk Z. Role of interleukin-6 and interleukin-10 in morphological and functional changes of the blood-brain barrier in hypertriglyceridemia. Fluids Barriers CNS 2023; 20:15. [PMID: 36882782 PMCID: PMC9990353 DOI: 10.1186/s12987-023-00418-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 02/24/2023] [Indexed: 03/09/2023] Open
Abstract
BACKGROUND Hypertriglyceridemia is closely linked to atherosclerosis related inflammatory processes and blood-brain barrier (BBB) dysfunction. Using apolipoprotein B-100 (APOB-100) transgenic mice, an animal model of chronic hypertriglyceridemia, we analyzed BBB function and morphology in vitro and ex vivo. Our objective was to determine which BBB characteristics are produced mainly by interleukin (IL)-6, an atherosclerosis promoting cytokine, and whether these actions can be antagonized by IL-10, an anti-inflammatory cytokine. METHODS Brain endothelial and glial cell cultures and brain microvessels were isolated from wild type (WT) and APOB-100 transgenic mice and were treated with IL-6, IL-10 and their combination. First, IL-6 and IL-10 production was measured in WT and APOB-100 microvessels using qPCR. Then functional parameters of endothelial cell cultures were analyzed and immunocytochemistry for key BBB proteins was performed. RESULTS IL-6 mRNA levels were higher in brain microvessels than in brain parenchyma of APOB-100 transgenic mice. Transendothelial electric resistance and P-glycoprotein activity were lower, and paracellular permeability was higher in cultured APOB-100 brain endothelial cells. These features were sensitive to both IL-6 and IL-10 treatments. A decreased P-glycoprotein immunostaining was measured in transgenic endothelial cells under control conditions and in WT cells after treating them with IL-6. This effect was antagonized by IL-10. Changes in immunostaining for tight junction proteins were observed after IL-6 exposure, which were in part antagonized by IL-10. In glial cell cultures an increase in aquaporin-4 immunolabeling in the transgenic group and an increase in microglia cell density in WT glia cultures was detected after IL-6 treatment, which was antagonized by IL-10. In isolated brain microvessels a decrease in P-glycoprotein immunolabeled area fraction was measured in APOB-100 microvessels under control conditions and in WT microvessels after every cytokine treatment. ZO-1 immunolabeling showed characteristics similar to that of P-glycoprotein. No change was seen in claudin-5 and occludin immunoreactive area fractions in microvessels. A decrease in aquaporin-4 immunoreactivity was measured in WT microvessels treated by IL-6, which was antagonized by IL-10. CONCLUSION IL-6 produced in microvessels contributes to BBB impairment observed in the APOB-100 mice. We showed that IL-10 partly antagonizes the effects of IL-6 at the BBB.
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Affiliation(s)
- Beáta Barabási
- Institute of Biophysics, Biological Research Centre, Temesvári Krt. 62, Szeged, 6726, Hungary.,Doctoral School of Theoretical Medicine, University of Szeged, Tisza L. Krt. 109, Szeged, 6725, Hungary
| | - Lilla Barna
- Institute of Biophysics, Biological Research Centre, Temesvári Krt. 62, Szeged, 6726, Hungary
| | - Ana Raquel Santa-Maria
- Institute of Biophysics, Biological Research Centre, Temesvári Krt. 62, Szeged, 6726, Hungary.,Wyss Institute for Biologically Inspired Engineering at Harvard University, 3 Blackfan Circle, Boston, MA, 02115, USA
| | - András Harazin
- Institute of Biophysics, Biological Research Centre, Temesvári Krt. 62, Szeged, 6726, Hungary
| | - Réka Molnár
- Institute of Biophysics, Biological Research Centre, Temesvári Krt. 62, Szeged, 6726, Hungary
| | - András Kincses
- Institute of Biophysics, Biological Research Centre, Temesvári Krt. 62, Szeged, 6726, Hungary
| | - Judit P Vigh
- Institute of Biophysics, Biological Research Centre, Temesvári Krt. 62, Szeged, 6726, Hungary
| | - Brigitta Dukay
- Institute of Biochemistry, Biological Research Centre, Temesvári Krt. 62, Szeged, 6726, Hungary
| | - Miklós Sántha
- Institute of Biochemistry, Biological Research Centre, Temesvári Krt. 62, Szeged, 6726, Hungary
| | - Melinda E Tóth
- Institute of Biochemistry, Biological Research Centre, Temesvári Krt. 62, Szeged, 6726, Hungary
| | - Fruzsina R Walter
- Institute of Biophysics, Biological Research Centre, Temesvári Krt. 62, Szeged, 6726, Hungary.
| | - Mária A Deli
- Institute of Biophysics, Biological Research Centre, Temesvári Krt. 62, Szeged, 6726, Hungary.
| | - Zsófia Hoyk
- Institute of Biophysics, Biological Research Centre, Temesvári Krt. 62, Szeged, 6726, Hungary.
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Becskeházi E, Korsós MM, Gál E, Tiszlavicz L, Hoyk Z, Deli MA, Köhler ZM, Keller-Pintér A, Horváth A, Csekő K, Helyes Z, Hegyi P, Venglovecz V. Inhibition of NHE-1 Increases Smoke-Induced Proliferative Activity of Barrett's Esophageal Cell Line. Int J Mol Sci 2021; 22:10581. [PMID: 34638919 PMCID: PMC8509038 DOI: 10.3390/ijms221910581] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 09/27/2021] [Accepted: 09/27/2021] [Indexed: 01/22/2023] Open
Abstract
Several clinical studies indicate that smoking predisposes its consumers to esophageal inflammatory and malignant diseases, but the cellular mechanism is not clear. Ion transporters protect esophageal epithelial cells by maintaining intracellular pH at normal levels. In this study, we hypothesized that smoking affects the function of ion transporters, thus playing a role in the development of smoking-induced esophageal diseases. Esophageal cell lines were treated with cigarettesmoke extract (CSE), and the viability and proliferation of the cells, as well as the activity, mRNA and protein expression of the Na+/H+ exchanger-1 (NHE-1), were studied. NHE-1 expression was also investigated in human samples. For chronic treatment, guinea pigs were exposed to tobacco smoke, and NHE-1 activity was measured. Silencing of NHE-1 was performed by using specific siRNA. CSE treatment increased the activity and protein expression of NHE-1 in the metaplastic cells and decreased the rate of proliferation in a NHE-1-dependent manner. In contrast, CSE increased the proliferation of dysplastic cells independently of NHE-1. In the normal cells, the expression and activity of NHE-1 decreased due to in vitro and in vivo smoke exposure. Smoking enhances the function of NHE-1 in Barrett's esophagus, and this is presumably a compensatory mechanism against this toxic agent.
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Affiliation(s)
- Eszter Becskeházi
- Department of Pharmacology and Pharmacotherapy, University of Szeged, H-6721 Szeged, Hungary; (E.B.); (M.M.K.); (E.G.)
| | - Marietta Margaréta Korsós
- Department of Pharmacology and Pharmacotherapy, University of Szeged, H-6721 Szeged, Hungary; (E.B.); (M.M.K.); (E.G.)
| | - Eleonóra Gál
- Department of Pharmacology and Pharmacotherapy, University of Szeged, H-6721 Szeged, Hungary; (E.B.); (M.M.K.); (E.G.)
| | - László Tiszlavicz
- Department of Pathology, University of Szeged, H-6725 Szeged, Hungary;
| | - Zsófia Hoyk
- Biological Research Centre, Institute of Biophysics, H-6726 Szeged, Hungary; (Z.H.); (M.A.D.)
| | - Mária A. Deli
- Biological Research Centre, Institute of Biophysics, H-6726 Szeged, Hungary; (Z.H.); (M.A.D.)
| | - Zoltán Márton Köhler
- Department of Biochemistry, University of Szeged, H-6720 Szeged, Hungary; (Z.M.K.); (A.K.-P.)
| | - Anikó Keller-Pintér
- Department of Biochemistry, University of Szeged, H-6720 Szeged, Hungary; (Z.M.K.); (A.K.-P.)
| | - Attila Horváth
- Department of Pharmacognosy, University of Szeged, H-6720 Szeged, Hungary;
| | - Kata Csekő
- Department of Pharmacology and Pharmacotherapy, Medical School & Szentágothai Research Centre, University of Pécs, H-7624 Pécs, Hungary; (K.C.); (Z.H.)
- PharmInVivo Ltd., H-7629 Pécs, Hungary
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy, Medical School & Szentágothai Research Centre, University of Pécs, H-7624 Pécs, Hungary; (K.C.); (Z.H.)
- PharmInVivo Ltd., H-7629 Pécs, Hungary
| | - Péter Hegyi
- First Department of Medicine, University of Szeged, H-6720 Szeged, Hungary;
- Medical School & Szentágothai Research Centre, Institute for Translational Medicine, University of Pécs, H-7624 Pécs, Hungary
- Division of Gastroenterology, First Department of Medicine, Medical School, University of Pécs, H-7624 Pécs, Hungary
| | - Viktória Venglovecz
- Department of Pharmacology and Pharmacotherapy, University of Szeged, H-6721 Szeged, Hungary; (E.B.); (M.M.K.); (E.G.)
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Dulka K, Szabo M, Lajkó N, Belecz I, Hoyk Z, Gulya K. Epigenetic Consequences of in Utero Exposure to Rosuvastatin: Alteration of Histone Methylation Patterns in Newborn Rat Brains. Int J Mol Sci 2021; 22:ijms22073412. [PMID: 33810299 PMCID: PMC8059142 DOI: 10.3390/ijms22073412] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Revised: 03/17/2021] [Accepted: 03/24/2021] [Indexed: 12/16/2022] Open
Abstract
Rosuvastatin (RST) is primarily used to treat high cholesterol levels. As it has potentially harmful but not well-documented effects on embryos, RST is contraindicated during pregnancy. To demonstrate whether RST could induce molecular epigenetic events in the brains of newborn rats, pregnant mothers were treated daily with oral RST from the 11th day of pregnancy for 10 days (or until delivery). On postnatal day 1, the brains of the control and RST-treated rats were removed for Western blot or immunohistochemical analyses. Several antibodies that recognize different methylation sites for H2A, H2B, H3, and H4 histones were quantified. Analyses of cell-type-specific markers in the newborn brains demonstrated that prenatal RST administration did not affect the composition and cell type ratios as compared to the controls. Prenatal RST administration did, however, induce a general, nonsignificant increase in H2AK118me1, H2BK5me1, H3, H3K9me3, H3K27me3, H3K36me2, H4, H4K20me2, and H4K20me3 levels, compared to the controls. Moreover, significant changes were detected in the number of H3K4me1 and H3K4me3 sites (134.3% ± 19.2% and 127.8% ± 8.5% of the controls, respectively), which are generally recognized as transcriptional activators. Fluorescent/confocal immunohistochemistry for cell-type-specific markers and histone methylation marks on tissue sections indicated that most of the increase at these sites belonged to neuronal cell nuclei. Thus, prenatal RST treatment induces epigenetic changes that could affect neuronal differentiation and development.
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Affiliation(s)
- Karolina Dulka
- Department of Cell Biology and Molecular Medicine, University of Szeged, 6720 Szeged, Hungary; (K.D.); (M.S.); (N.L.)
| | - Melinda Szabo
- Department of Cell Biology and Molecular Medicine, University of Szeged, 6720 Szeged, Hungary; (K.D.); (M.S.); (N.L.)
| | - Noémi Lajkó
- Department of Cell Biology and Molecular Medicine, University of Szeged, 6720 Szeged, Hungary; (K.D.); (M.S.); (N.L.)
| | - István Belecz
- Department of Medical Biology, University of Szeged, 6720 Szeged, Hungary;
| | - Zsófia Hoyk
- Biological Barriers Research Group, Institute of Biophysics, Biological Research Center, Eötvös Loránd Research Network, 6726 Szeged, Hungary;
| | - Karoly Gulya
- Department of Cell Biology and Molecular Medicine, University of Szeged, 6720 Szeged, Hungary; (K.D.); (M.S.); (N.L.)
- Correspondence:
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Dukay B, Walter FR, Vigh JP, Barabási B, Hajdu P, Balassa T, Migh E, Kincses A, Hoyk Z, Szögi T, Borbély E, Csoboz B, Horváth P, Fülöp L, Penke B, Vígh L, Deli MA, Sántha M, Tóth ME. Neuroinflammatory processes are augmented in mice overexpressing human heat-shock protein B1 following ethanol-induced brain injury. J Neuroinflammation 2021; 18:22. [PMID: 33423680 PMCID: PMC7798334 DOI: 10.1186/s12974-020-02070-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [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: 08/07/2020] [Accepted: 12/30/2020] [Indexed: 12/27/2022] Open
Abstract
Background Heat-shock protein B1 (HSPB1) is among the most well-known and versatile member of the evolutionarily conserved family of small heat-shock proteins. It has been implicated to serve a neuroprotective role against various neurological disorders via its modulatory activity on inflammation, yet its exact role in neuroinflammation is poorly understood. In order to shed light on the exact mechanism of inflammation modulation by HSPB1, we investigated the effect of HSPB1 on neuroinflammatory processes in an in vivo and in vitro model of acute brain injury. Methods In this study, we used a transgenic mouse strain overexpressing the human HSPB1 protein. In the in vivo experiments, 7-day-old transgenic and wild-type mice were treated with ethanol. Apoptotic cells were detected using TUNEL assay. The mRNA and protein levels of cytokines and glial cell markers were examined using RT-PCR and immunohistochemistry in the brain. We also established primary neuronal, astrocyte, and microglial cultures which were subjected to cytokine and ethanol treatments. TNFα and hHSPB1 levels were measured from the supernates by ELISA, and intracellular hHSPB1 expression was analyzed using fluorescent immunohistochemistry. Results Following ethanol treatment, the brains of hHSPB1-overexpressing mice showed a significantly higher mRNA level of pro-inflammatory cytokines (Tnf, Il1b), microglia (Cd68, Arg1), and astrocyte (Gfap) markers compared to wild-type brains. Microglial activation, and 1 week later, reactive astrogliosis was higher in certain brain areas of ethanol-treated transgenic mice compared to those of wild-types. Despite the remarkably high expression of pro-apoptotic Tnf, hHSPB1-overexpressing mice did not exhibit higher level of apoptosis. Our data suggest that intracellular hHSPB1, showing the highest level in primary astrocytes, was responsible for the inflammation-regulating effects. Microglia cells were the main source of TNFα in our model. Microglia isolated from hHSPB1-overexpressing mice showed a significantly higher release of TNFα compared to wild-type cells under inflammatory conditions. Conclusions Our work provides novel in vivo evidence that hHSPB1 overexpression has a regulating effect on acute neuroinflammation by intensifying the expression of pro-inflammatory cytokines and enhancing glial cell activation, but not increasing neuronal apoptosis. These results suggest that hHSPB1 may play a complex role in the modulation of the ethanol-induced neuroinflammatory response. Supplementary Information The online version contains supplementary material available at 10.1186/s12974-020-02070-2.
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Affiliation(s)
- Brigitta Dukay
- Institute of Biochemistry, Biological Research Centre, Temesvári krt. 62, Szeged, H-6726, Hungary. .,Doctoral School in Biology, University of Szeged, Szeged, Hungary.
| | - Fruzsina R Walter
- Institute of Biophysics, Biological Research Centre, Szeged, Hungary
| | - Judit P Vigh
- Institute of Biophysics, Biological Research Centre, Szeged, Hungary
| | - Beáta Barabási
- Institute of Biophysics, Biological Research Centre, Szeged, Hungary.,Doctoral School in Theoretical Medicine, University of Szeged, Szeged, Hungary
| | - Petra Hajdu
- Institute of Biochemistry, Biological Research Centre, Temesvári krt. 62, Szeged, H-6726, Hungary
| | - Tamás Balassa
- Institute of Biochemistry, Biological Research Centre, Temesvári krt. 62, Szeged, H-6726, Hungary.,Doctoral School of Informatics, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Ede Migh
- Institute of Biochemistry, Biological Research Centre, Temesvári krt. 62, Szeged, H-6726, Hungary
| | - András Kincses
- Institute of Biophysics, Biological Research Centre, Szeged, Hungary
| | - Zsófia Hoyk
- Institute of Biophysics, Biological Research Centre, Szeged, Hungary
| | - Titanilla Szögi
- Department of Medical Chemistry, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - Emőke Borbély
- Department of Medical Chemistry, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - Bálint Csoboz
- Institute of Biochemistry, Biological Research Centre, Temesvári krt. 62, Szeged, H-6726, Hungary.,Institute of Medical Biology, University of Tromsø, Tromsø, Norway
| | - Péter Horváth
- Institute of Biochemistry, Biological Research Centre, Temesvári krt. 62, Szeged, H-6726, Hungary.,Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki, Finland
| | - Lívia Fülöp
- Department of Medical Chemistry, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - Botond Penke
- Department of Medical Chemistry, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - László Vígh
- Institute of Biochemistry, Biological Research Centre, Temesvári krt. 62, Szeged, H-6726, Hungary
| | - Mária A Deli
- Institute of Biophysics, Biological Research Centre, Szeged, Hungary
| | - Miklós Sántha
- Institute of Biochemistry, Biological Research Centre, Temesvári krt. 62, Szeged, H-6726, Hungary
| | - Melinda E Tóth
- Institute of Biochemistry, Biological Research Centre, Temesvári krt. 62, Szeged, H-6726, Hungary.
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Tóth ME, Dukay B, Hoyk Z, Sántha M. Cerebrovascular Changes and Neurodegeneration Related to Hyperlipidemia: Characteristics of the Human ApoB-100 Transgenic Mice. Curr Pharm Des 2020; 26:1486-1494. [PMID: 32067608 PMCID: PMC7403644 DOI: 10.2174/1381612826666200218101818] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 11/27/2019] [Indexed: 01/07/2023]
Abstract
Serum lipid levels are closely related to the structure and function of blood vessels. Chronic hyperlipidemia may lead to damage in both the cardio- and the cerebrovascular systems. Vascular dysfunctions, including impairments of the blood-brain barrier, are known to be associated with neurodegenerative diseases. A growing number of evidence suggests that cardiovascular risk factors, such as hyperlipidemia, may increase the likelihood of developing dementia. Due to differences in lipoprotein metabolism, wild-type mice are protected against diet-induced hypercholesterolemia, and their serum lipid profile is different from that observed in humans. Therefore, several transgenic mouse models have been established to study the role of different apolipoproteins and their receptors in lipid metabolism, as well as the complications related to pathological lipoprotein levels. This mini-review focused on a transgenic mouse model overexpressing an apolipoprotein, the human ApoB-100. We discussed literature data and current advancements on the understanding of ApoB-100 induced cardio- and cerebrovascular lesions in order to demonstrate the involvement of this type of apolipoprotein in a wide range of pathologies, and a link between hyperlipidemia and neurodegeneration.
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Affiliation(s)
- Melinda E Tóth
- Institute of Biochemistry, Biological Research Centre, Sezeged, Hungary
| | - Brigitta Dukay
- Institute of Biochemistry, Biological Research Centre, Sezeged, Hungary.,Doctoral School in Biology, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | - Zsófia Hoyk
- Institute of Biophysics, Biological Research Centre, H-6726 Szeged, Temesvári krt. 62., Hungary
| | - Miklós Sántha
- Institute of Biochemistry, Biological Research Centre, Sezeged, Hungary
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6
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Hoyk Z, Tóth ME, Lénárt N, Nagy D, Dukay B, Csefová A, Zvara Á, Seprényi G, Kincses A, Walter FR, Veszelka S, Vígh J, Barabási B, Harazin A, Kittel Á, Puskás LG, Penke B, Vígh L, Deli MA, Sántha M. Cerebrovascular Pathology in Hypertriglyceridemic APOB-100 Transgenic Mice. Front Cell Neurosci 2018; 12:380. [PMID: 30410436 PMCID: PMC6209654 DOI: 10.3389/fncel.2018.00380] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Accepted: 10/04/2018] [Indexed: 01/08/2023] Open
Abstract
Hypertriglyceridemia is not only a serious risk factor in the development of cardiovascular diseases, but it is linked to neurodegeneration, too. Previously, we generated transgenic mice overexpressing the human APOB-100 protein, a mouse model of human atherosclerosis. In this model we observed high plasma levels of triglycerides, oxidative stress, tau hyperphosphorylation, synaptic dysfunction, cognitive impairment, increased neural apoptosis and neurodegeneration. Neurovascular dysfunction is recognized as a key factor in the development of neurodegenerative diseases, but the cellular and molecular events linking cerebrovascular pathology and neurodegeneration are not fully understood. Our aim was to study cerebrovascular changes in APOB-100 transgenic mice. We described the kinetics of the development of chronic hypertriglyceridemia in the transgenic animals. Increased blood-brain barrier permeability was found in the hippocampus of APOB-100 transgenic mice which was accompanied by structural changes. Using transmission electron microscopy, we detected changes in the brain capillary endothelial tight junction structure and edematous swelling of astrocyte endfeet. In brain microvessels isolated from APOB-100 transgenic animals increased Lox-1, Aqp4, and decreased Meox-2, Mfsd2a, Abcb1a, Lrp2, Glut-1, Nos2, Nos3, Vim, and in transgenic brains reduced Cdh2 and Gfap-σ gene expressions were measured using quantitative real-time PCR. We confirmed the decreased P-glycoprotein (ABCB1) and vimentin expression related to the neurovascular unit by immunostaining in transgenic brain sections using confocal microscopy. We conclude that in chronic hypertriglyceridemic APOB-100 transgenic mice both functional and morphological cerebrovascular pathology can be observed, and this animal model could be a useful tool to study the link between cerebrovascular pathology and neurodegeneration.
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Affiliation(s)
- Zsófia Hoyk
- Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Melinda E Tóth
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Nikolett Lénárt
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Dóra Nagy
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Brigitta Dukay
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Alexandra Csefová
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Ágnes Zvara
- Laboratory of Functional Genomics, Core Facilities, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - György Seprényi
- Department of Anatomy, Histology and Embryology, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - András Kincses
- Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Fruzsina R Walter
- Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Szilvia Veszelka
- Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Judit Vígh
- Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Beáta Barabási
- Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - András Harazin
- Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Ágnes Kittel
- Laboratory of Molecular Pharmacology, Department of Pharmacology, Institute of Experimental Medicine, Hungarian Academy of Sciences, Budapest, Hungary
| | - László G Puskás
- Laboratory of Functional Genomics, Core Facilities, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Botond Penke
- Department of Medical Chemistry, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - László Vígh
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Mária A Deli
- Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Miklós Sántha
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
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Małecki A, Skipor-Lahuta J, Toborek M, Abbott NJ, Antonetti DA, Su EJ, Lawrence DA, Atış M, Akcan U, Yılmaz CU, Orhan N, Düzgün P, Ceylan UD, Arıcan N, Karahüseyinoğlu S, Şahin GN, Ahıshalı B, Kaya M, Aydin S, Klopstein A, Engelhardt B, Baumann J, Tsao CC, Huang SF, Ogunshola O, Boytsova EB, Morgun AV, Khilazheva ED, Pozhilenkova EA, Gorina YV, Martynova GP, Salmina AB, Bueno D, Garcia-Fernàndez J, Castro V, Skowronska M, Toborek M, Chupel MU, Minuzzi LG, Filaire E, Teixeira AM, Corsi M, Versele R, Fuso A, Sevin E, Di Lorenzo C, Businaro R, Fenart L, Gosselet F, Candela P, Deli MA, Delaney C, O’Keefe E, Farrell M, Doyle S, Campbell M, Drewes LR, Appelt-Menzel A, Cubukova A, Metzger M, Fischer R, Francisco DMF, Bruggmann R, Fries A, Blecharz KG, Wagner J, Winkler L, Schneider U, Vajkoczy P, Furuse M, Gabbert L, Dilling C, Sisario D, Soukhoroukov V, Burek M, Guérit S, Fidan E, Devraj K, Czupalla CJ, Macas J, Thom S, Plate KH, Gerhardt H, Liebner S, Harazin A, Bocsik A, Váradi J, Fenyvesi F, Tubak V, Vecsernyés M, Helms HC, Waagepetersen HS, Nielsen CU, Brodin B, Hoyk Z, Tóth ME, Lénárt N, Dukay B, Kittel Á, Vígh J, Veszelka S, Walter F, Zvara Á, Puskás L, Sántha M, Engelhardt S, Ogunshola OO, Huber A, Reitner A, Osmen S, Hahn K, Bounzina N, Gerhartl A, Schönegger A, Steinkellner H, Laccone F, Neuhaus W, Hudson N, Celkova L, Iltzsche A, Drndarski S, Begley DJ, Janiurek MM, Kucharz K, Christoffersen C, Nielsen LB, Lauritzen M, Johnson RH, Kho DT, O’Carroll SJ, Angel CE, Graham ES, Pereira J, Karali CS, Cheng V, Zarghami N, Soto MS, Couch Y, Anthony DC, Sibson NR, Kealy J, Keep RF, Routhe LJ, Xiang J, Ye H, Hua Y, Moos T, Xi G, Kristensen M, Bach A, Strømgaard K, Kutuzov N, Lopes-Pinheiro MA, Lim J, Kamermans A, van Horssen J, Unger WW, Fontijn R, de Vries HE, Majerova P, Garruto RM, Marchetti L, Francisco D, Gruber I, Lyck R, Mészáros M, Porkoláb G, Kiss L, Pilbat AM, Török Z, Bozsó Z, Fülöp L, Michalicova A, Galba J, Mihaljevic S, Novak M, Kovac A, Morofuji Y, Fujimoto T, Watanabe D, Nakagawa S, Ujifuku K, Horie N, Izumo T, Anda T, Matsuo T, Niu F, Buch S, Nyúl-Tóth Á, Kozma M, Nagyőszi P, Nagy K, Fazakas C, Haskó J, Molnár K, Farkas AE, Galajda P, Wilhelm I, Krizbai IA, Kelly E, Wallace E, Greene C, Hughes S, Kealy J, Doyle N, Humphries MM, Grant GA, Friedman A, Veksler R, Molloy MG, Meaney JF, Pender N, Doherty CP, Park M, Liskiewicz A, Przybyla M, Kasprowska-Liśkiewicz D, Nowacka-Chmielewska M, Malecki A, Pombero A, Garcia-Lopez R, Martinez-Morga M, Martinez S, Prager O, Solomon-Kamintsky L, Schoknecht K, Bar-Klein G, Milikovsky D, Vazana U, Rosenbach D, Kovács R, Friedman A, Radak Z, Rodríguez-Lorenzo S, Bruggmann R, Kooij G, de Vries HE, Oxana SG, Denis B, Elena V, Anna A, Alla S, Vladimir S, Andrey M, Nataliya M, Elena K, Elizaveta B, Alexander S, Nikita N, Alla B, Yirong Y, Arkady A, Artem G, Mariya U, Anastasia S, Madina B, Artem S, Alexander K, Esmat SA, Valery P, Artem T, Jürgen K, de Abreu MS, Calpena AC, Espina M, García ML, Romero IA, Male D, Storck S, Hartz A, Pahnke J, Surma CU, Surma M, Giżejewski Z, Zieliński H, Szczepkowska A, Kowalewska M, Krawczynska A, Herman AP, Skipor J, Kachappilly N, Veenstra M, Rivera RL, Williams DW, Morgello S, Berman JW, Wyneken U, Batiz LF, Temizyürek A, Khodadust R, Küçük M, Gürses C, Emik S, Zielińska M, Obara-Michlewska M, Milewski K, Skonieczna E, Fręśko I, Neuwelt EA, Maria ARS, Bras AR, Lipka D, Valkai S, Kincses A, Dér A, Deli MA. Abstracts from the 20th International Symposium on Signal Transduction at the Blood-Brain Barriers. Fluids Barriers CNS 2017. [PMCID: PMC5667590 DOI: 10.1186/s12987-017-0071-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Pardutz A, Hoyk Z, Varga H, Vecsei L, Schoenen J. Oestrogen-Modulated Increase of Calmodulin-Dependent Protein Kinase II (CamKII) in Rat Spinal Trigeminal Nucleus After Systemic Nitroglycerin. Cephalalgia 2016; 27:46-53. [PMID: 17212683 DOI: 10.1111/j.1468-2982.2006.01244.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Migraine can be triggered by systemic administration of the nitric oxide (NO) donor nitroglycerin (NTG) and by abrupt falls in plasma oestradiol. Calmodulin-dependent protein kinase II (CamKII) present in superficial dorsal horns is thought to play a role in sensitization of central nociceptors, a phenomen present in migraineurs. We therefore examined in rats the expression of CamKII in the caudal trigeminal nucleus (TNC) after subcutaneous NTG (10 mg/kg) and its modulation by oestrogen. In male rats and in ovariectomized females, after 4 h NTG increased significantly CamKII expression in the superficial layers of TNC, but not in the upper thoracic spinal cord. NTG had no effect on CamKII expression in oestradiol-treated ovariectomized animals. Thus NTG, i.e. NO, selectively enhances CamKII in the rat TNC and oestradiol blocks this effect. These data may help to understand the mechanisms by which NO triggers migraine attacks and oestrogens influence migraine severity.
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Affiliation(s)
- A Pardutz
- Research Centre for Cellular & Molecular Neurobiology, University of Liège, Liège, Belgium
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9
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Barabási B, Csondor A, Martín-Pozas T, Pulupa Sánchez A, Antalffy G, Siklós L, Gómez-Pinedo U, Párducz Á, Hoyk Z. Effect of axotomy and 17β-estradiol on P2X7 receptor expression pattern in the hypoglossal nucleus of ovariectomized mice. Neuroscience 2016; 319:107-15. [DOI: 10.1016/j.neuroscience.2016.01.049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Revised: 01/19/2016] [Accepted: 01/22/2016] [Indexed: 12/18/2022]
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Sántha P, Veszelka S, Hoyk Z, Mészáros M, Walter FR, Tóth AE, Kiss L, Kincses A, Oláh Z, Seprényi G, Rákhely G, Dér A, Pákáski M, Kálmán J, Kittel Á, Deli MA. Restraint Stress-Induced Morphological Changes at the Blood-Brain Barrier in Adult Rats. Front Mol Neurosci 2016; 8:88. [PMID: 26834555 PMCID: PMC4712270 DOI: 10.3389/fnmol.2015.00088] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [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: 10/21/2015] [Accepted: 12/21/2015] [Indexed: 12/16/2022] Open
Abstract
Stress is well-known to contribute to the development of both neurological and psychiatric diseases. While the role of the blood-brain barrier is increasingly recognized in the development of neurodegenerative disorders, such as Alzheimer's disease, dysfunction of the blood-brain barrier has been linked to stress-related psychiatric diseases only recently. In the present study the effects of restraint stress with different duration (1, 3, and 21 days) were investigated on the morphology of the blood-brain barrier in male adult Wistar rats. Frontal cortex and hippocampus sections were immunostained for markers of brain endothelial cells (claudin-5, occluding, and glucose transporter-1) and astroglia (GFAP). Staining pattern and intensity were visualized by confocal microscopy and evaluated by several types of image analysis. The ultrastructure of brain capillaries was investigated by electron microscopy. Morphological changes and intensity alterations in brain endothelial tight junction proteins claudin-5 and occludin were induced by stress. Following restraint stress significant increases in the fluorescence intensity of glucose transporter-1 were detected in brain endothelial cells in the frontal cortex and hippocampus. Significant reductions in GFAP fluorescence intensity were observed in the frontal cortex in all stress groups. As observed by electron microscopy, 1-day acute stress induced morphological changes indicating damage in capillary endothelial cells in both brain regions. After 21 days of stress thicker and irregular capillary basal membranes in the hippocampus and edema in astrocytes in both regions were seen. These findings indicate that stress exerts time-dependent changes in the staining pattern of tight junction proteins occludin, claudin-5, and glucose transporter-1 at the level of brain capillaries and in the ultrastructure of brain endothelial cells and astroglial endfeet, which may contribute to neurodegenerative processes, cognitive and behavioral dysfunctions.
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Affiliation(s)
- Petra Sántha
- Biological Barriers Research Group, Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences Szeged, Hungary
| | - Szilvia Veszelka
- Biological Barriers Research Group, Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences Szeged, Hungary
| | - Zsófia Hoyk
- Biological Barriers Research Group, Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences Szeged, Hungary
| | - Mária Mészáros
- Biological Barriers Research Group, Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences Szeged, Hungary
| | - Fruzsina R Walter
- Biological Barriers Research Group, Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences Szeged, Hungary
| | - Andrea E Tóth
- Biological Barriers Research Group, Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences Szeged, Hungary
| | - Lóránd Kiss
- Biological Barriers Research Group, Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences Szeged, Hungary
| | - András Kincses
- Biomolecular Electronics Research Group, Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences Szeged, Hungary
| | - Zita Oláh
- Department of Psychiatry, Alzheimer's Disease Research Centre, University of Szeged Szeged, Hungary
| | - György Seprényi
- Department of Medical Biology, University of Szeged Szeged, Hungary
| | - Gábor Rákhely
- Department of Biotechnology, University of Szeged Szeged, Hungary
| | - András Dér
- Biomolecular Electronics Research Group, Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences Szeged, Hungary
| | - Magdolna Pákáski
- Department of Psychiatry, Alzheimer's Disease Research Centre, University of Szeged Szeged, Hungary
| | - János Kálmán
- Department of Psychiatry, Alzheimer's Disease Research Centre, University of Szeged Szeged, Hungary
| | - Ágnes Kittel
- Department of Pharmacology, Institute of Experimental Medicine, Hungarian Academy of Sciences Budapest, Hungary
| | - Mária A Deli
- Biological Barriers Research Group, Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences Szeged, Hungary
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11
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Gyenes A, Hoyk Z, Csakvari E, Siklos L, Parducz A. 17β-estradiol attenuates injury-induced microglia activation in the oculomotor nucleus. Neuroscience 2010; 171:677-82. [PMID: 20870014 DOI: 10.1016/j.neuroscience.2010.09.033] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Revised: 09/08/2010] [Accepted: 09/17/2010] [Indexed: 11/30/2022]
Abstract
Recent studies provide increasing data indicating the prominent role of estrogens in protecting the nervous system against the noxious consequences of nerve injury. It is also clear that in the process of nerve injury and recovery not only the neurons, but the glial cells are also involved and they are important components of the protective mechanisms. In the present article the effect of 17β-estradiol on injury-induced microglia activation was studied in an animal model. Peripheral axotomy of the oculomotor neurons was achieved by the removal of the right eyeball including the extraocular muscles of ovariectomized adult mice. The time course and the extent of microglia activation was followed by the unbiased morphometric analysis of CD11b immunoreactive structures within the oculomotor nucleus. The first sign of microglia activation appeared after 24 h following injury, the maximal effect was found on the fourth day. In ovariectomized females hormone treatment (daily injection of 17β-estradiol, 5 μg/100 g b.w.) decreased significantly the microglia reaction at postoperative day 4. Our results show that microglia response to nerve injury is affected by estradiol, that is these cells may mediate some of the hormonal effects and may contribute to protective mechanisms resulting in the structural and functional recovery of the nervous system.
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Affiliation(s)
- A Gyenes
- Institute of Biophysics, Biological Research Center, Szeged, Temesvári körút 62. H-6726, Hungary
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12
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Hoyk Z, Csákvári E, Szájli A, Kóti J, Paragi G, Gyenes A, Wölfling J, Pfoh R, Rühl S, Párducz A. Computer-aided structure analysis of an epimerized dehydroepiandrosterone derivative and its biological effect in a model of reactive gliosis. Steroids 2010; 75:265-71. [PMID: 20064537 DOI: 10.1016/j.steroids.2010.01.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2009] [Revised: 11/06/2009] [Accepted: 01/03/2010] [Indexed: 11/28/2022]
Abstract
The naturally occurring steroid dehydroepiandrosterone (DHEA) is reported to reduce glial fibrillary acidic protein (GFAP) overexpression in a model of reactive gliosis due to its conversion to estradiol by the enzyme aromatase. In the present study we examined the biological effect of a new epimerized derivative of DHEA, 16alpha-iodomethyl-13alpha-dehydroepiandrosterone derivative (16alpha-iodomethyl-13alpha-DHEAd, 16alpha-iodomethyl-13alpha-androst-5-en-3beta,17beta-diol), using the same model system, and compared the 3D structure of this molecule with that of DHEA and two steroidal type aromatase inhibitors, formestane and exemestane. The synthetic compound, in contrast to the reported effect of DHEA, was able to reduce GFAP overexpression only if the enzyme aromatase was inhibited. Data obtained from computational calculations fortified by X-ray crystallography revealed that contrary to the nearly planar sterane framework of DHEA, the synthetic derivative 16alpha-iodomethyl-13alpha-DHEAd has a bent sterane skeleton, resulting in a 3D structure that is similar to that of formestane or exemestane. Moreover, 16alpha-iodomethyl-13alpha-DHEAd resulted to be metabolically more stable than DHEA. The results suggest that epimerization of the sterane skeleton of DHEA inclines the plane of the D ring, leading to a significantly altered biological activity. The synthetic molecule has a DHEA-like effect on GFAP overexpression when the enzyme aromatase is inhibited and the naturally occurring DHEA is ineffective in this respect. On the other hand, based on their structural similarity it can be hypothesized that 16alpha-iodomethyl-13alpha-DHEAd applied alone might have a biological effect similar to that of formestane or exemestane.
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Affiliation(s)
- Zsófia Hoyk
- Institute of Biophysics, Biological Research Center, Szeged, Temesvári krt. 62, H-6726 Szeged, Hungary
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13
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Kurunczi A, Hoyk Z, Csakvari E, Gyenes A, Párducz Á. 17β-Estradiol-induced remodeling of GABAergic axo-somatic synapses on estrogen receptor expressing neurons in the anteroventral periventricular nucleus of adult female rats. Neuroscience 2009; 158:553-7. [DOI: 10.1016/j.neuroscience.2008.10.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2008] [Accepted: 11/06/2008] [Indexed: 11/28/2022]
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Csakvari E, Hoyk Z, Gyenes A, Garcia-Ovejero D, Garcia-Segura LM, Párducz A. Fluctuation of synapse density in the arcuate nucleus during the estrous cycle. Neuroscience 2007; 144:1288-92. [PMID: 17161546 DOI: 10.1016/j.neuroscience.2006.11.008] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2006] [Revised: 11/06/2006] [Accepted: 11/06/2006] [Indexed: 11/26/2022]
Abstract
The hypothalamic arcuate nucleus integrates different hormonal and neural signals to control neuroendocrine events, feeding, energy balance and reproduction. Previous studies have shown that in adult female rats the arcuate nucleus undergoes a cyclic fluctuation in the number of axo-somatic synapses during the estrous cycle, in parallel to the variation of ovarian hormone levels in plasma. In the present study we have used an unbiased stereological analysis in conjunction with postembedding immunocytochemistry to assess whether the synaptic remodeling during the estrous cycle in rats is specific for certain types of synapses. Our findings indicate that there is a significant decrease in the number of GABAergic axo-somatic synapses on proestrus afternoon and estrus day compared with other days of the estrous cycle. This decrease in GABAergic synapses is accompanied by an increase in the number of dendritic spine synapses. The synaptic density appears to cycle back to proestrus morning values on metestrus day. In contrast, the number of synapses on dendritic shafts does not change during the cycle. These results indicate that a rapid and selective synaptic turnover of arcuate synapses occurs in physiological circumstances.
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Affiliation(s)
- E Csakvari
- Laboratory of Molecular Neurobiology, Institute of Biophysics, Biological Research Center, Temesvári krt. 62, H-6701 Szeged, Hungary
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15
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Balogh G, Horváth I, Nagy E, Hoyk Z, Benkõ S, Bensaude O, Vígh L. The hyperfluidization of mammalian cell membranes acts as a signal to initiate the heat shock protein response. FEBS J 2006; 272:6077-86. [PMID: 16302971 DOI: 10.1111/j.1742-4658.2005.04999.x] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The concentrations of two structurally distinct membrane fluidizers, the local anesthetic benzyl alcohol (BA) and heptanol (HE), were used at concentrations so that their addition to K562 cells caused identical increases in the level of plasma membrane fluidity as tested by 1,6-diphenyl-1,3,5-hexatriene (DPH) anisotropy. The level of membrane fluidization induced by the chemical agents on isolated membranes at such concentrations corresponded to the membrane fluidity increase seen during a thermal shift up to 42 degrees C. The formation of isofluid membrane states in response to the administration of BA or HE resulted in almost identical downshifts in the temperature thresholds of the heat shock response, accompanied by increases in the expression of genes for stress proteins such as heat shock protein (HSP)-70 at the physiological temperature. Similarly to thermal stress, the exposure of the cells to these membrane fluidizers elicited nearly identical increases of cytosolic Ca2+ concentration in both Ca2+-containing and Ca2+-free media and also closely similar extents of increase in mitochondrial hyperpolarization. We obtained no evidence that the activation of heat shock protein expression by membrane fluidizers is induced by a protein-unfolding signal. We suggest, that the increase of fluidity in specific membrane domains, together with subsequent alterations in key cellular events are converted into signal(s) leading to activation of heat shock genes.
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Affiliation(s)
- Gábor Balogh
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
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16
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Hoyk Z, Varga C, Párducz A. Estrogen-induced region specific decrease in the density of 5-bromo-2-deoxyuridine-labeled cells in the olfactory bulb of adult female rats. Neuroscience 2006; 141:1919-24. [PMID: 16814932 DOI: 10.1016/j.neuroscience.2006.05.053] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [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: 04/14/2006] [Revised: 05/17/2006] [Accepted: 05/17/2006] [Indexed: 10/24/2022]
Abstract
Effects of chronic estrogen treatment on the survival rate of newly integrated interneurons were studied in the olfactory bulb of adult (250-300 g) female rats. Ovariectomized rats received 17-beta estradiol dissolved in sesame oil (i.p., 100 microg/100 g body weight [b.w.]) during six consecutive days, and on day 6 they were also injected with the mitotic marker 5-bromo-2-deoxyuridine (BrdU, i.p., 50 mg/kg b.w.) in every 2 hours during 8 hours. After 21 days of survival animals were killed and the density of BrdU-immunoreactive cells was analyzed in the granule cell and glomerular layer both in the main and accessory olfactory bulb. A significant decrease was found in the density of BrdU-labeled cells in both layers examined in the accessory olfactory bulb of ovariectomized and estradiol-treated rats when compared with those of ovariectomized and vehicle-treated animals. In the main olfactory bulb, in contrast, no difference was observed in the density of BrdU-immunoreactive cells in either of the two layers. Our results suggest that cells destined to the glomerular and granule cell layers react in the same way to chronic estrogen treatment, and the effect of estradiol is region specific, at least, within the olfactory bulb. 17-Beta estradiol reduces the density of newly generated cells in the accessory olfactory bulb, an area involved in the perception of pheromones, thus having a role in regulating sexual behavior, while the rate of integration and survival of newly born cells in the first relay station of the main olfactory pathway, i.e. the main olfactory bulb, remains unchanged.
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Affiliation(s)
- Z Hoyk
- Institute of Biophysics, Biological Research Center, Temesvári krt. 62, Szeged, H-6726 Hungary
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17
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Parducz A, Hajszan T, Maclusky NJ, Hoyk Z, Csakvari E, Kurunczi A, Prange-Kiel J, Leranth C. Synaptic remodeling induced by gonadal hormones: neuronal plasticity as a mediator of neuroendocrine and behavioral responses to steroids. Neuroscience 2005; 138:977-85. [PMID: 16310961 DOI: 10.1016/j.neuroscience.2005.07.008] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.9] [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: 05/30/2005] [Revised: 07/04/2005] [Accepted: 07/12/2005] [Indexed: 11/21/2022]
Abstract
During recent decades, it has become a generally accepted view that structural neuroplasticity is remarkably involved in the functional adaptation of the CNS. Thus, cellular morphology in the brain is in continuous transition throughout the life span, as a response to environmental stimuli. The effects of the environment on neuroplasticity are mediated by, to some extent, the changing levels of circulating gonadal steroid hormones. Today, it is clear that the function of gonadal steroids in the brain extends beyond simply regulating reproductive and/or neuroendocrine events. In addition, or even more importantly, gonadal steroids participate in the shaping of the developing brain, while their actions during adult life are implicated in higher brain functions such as cognition, mood and memory. A large body of evidence indicates that gonadal steroid-induced functional changes are accompanied by alterations in neuron and synapse numbers, as well as in dendritic and synaptic morphology. These structural modifications are believed to serve as a morphological basis for changes in behavior and cellular activity. Due to their growing functional and clinical significance, the specificity, timeframe, as well as the molecular and cellular mechanisms of hormone-induced neuroplasticity have become the focus of many studies. In this review, we briefly summarize current knowledge and the most significant recent discoveries from our laboratories on estrogen- and dehydroepiandrosterone-induced synaptic remodeling in the hypothalamus and hippocampus, two important brain areas heavily involved in autonomic and cognitive operations, respectively.
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Affiliation(s)
- A Parducz
- Laboratory of Molecular Neurobiology, Biological Research Center, Hungarian Academy of Sciences, Szeged.
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Vezér T, Papp A, Hoyk Z, Varga C, Náray M, Nagymajtényi L. Behavioral and neurotoxicological effects of subchronic manganese exposure in rats. Environ Toxicol Pharmacol 2005; 19:797-810. [PMID: 21783557 DOI: 10.1016/j.etap.2004.12.046] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In male Wistar rats, behavioral and electrophysiological investigations, and blood and brain manganese level determinations, were performed; during 10 weeks treatment with low-dose manganese chloride and a 12 weeks post-treatment period. Three groups of 16 animals each received daily doses of 14.84 and 59.36mg/kg b.w. MnCl(2) (control: distilled water) via gavage. During treatment period, Mn accumulation was seen first in the blood, then in the brain samples of the high-dose animals. Short- and long-term spatial memory performance of the treated animals decreased, spontaneous open field activity (OF) was reduced. The number of acoustic startle responses (ASR), and the pre-pulse inhibition (PPI) of these, diminished. In the cortical and hippocampal spontaneous activity, power spectrum was shifted to higher frequencies. The latency of the sensory evoked potentials increased, and their duration, decreased. By the end of the post-treatment period, Mn levels returned to the control in all samples. The impairment of long-term spatial memory remained, as did the number of acoustic startle responses. Pre-pulse inhibition, however, returned to the pre-treatment levels. The changes of the open field activity disappeared but a residual effect could be revealed by administration of d-amphetamine. The electrophysiological effects were partially reversed. By applying a complex set of methods, it was possible to obtain new data for a better-based relationship between the known effects of Mn at neuronal level and the behavioral and electrophysiological outcomes of Mn exposure.
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Affiliation(s)
- Tünde Vezér
- Department of Public Health, University of Szeged, Dóm tér 10, H-6720 Szeged, Hungary
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Abstract
Effects of dehydroepiandrosterone (DHEA) on glial reactions of the peripherally denervated olfactory bulb were studied in adult male rats. Denervation was achieved by destroying the olfactory mucosa with ZnSO(4) (0.17 M) irrigation of the nasal cavities. In one series of experiments, chronic DHEA treatment was applied (daily injections for 7 days, i.p., 10 mg/kg b.w. and 25 mg/kg b.w.); in the other series of experiments, animals received a single injection of DHEA (i.p., 10 mg/kg b.w., 25 mg/kg b.w. and 50 mg/kg b.w.) 2 h following ZnSO(4) treatment. To determine whether DHEA conversion to estradiol was involved in the mechanism of DHEA action on glia, a third series of experiments was carried out in which the aromatase inhibitor fadrozole (4.16 mg/ml) was administered using subcutaneously implanted osmotic minipumps. Rats were killed on day 7 after chemical denervation, and the reaction of glial cells was monitored within the olfactory bulb, using GFAP and vimentin immunohistochemistry. Qualitative changes in GFAP expression were analyzed by Western blot. Chronic DHEA treatment with both doses (10 mg/kg b.w. and 25 mg/kg b.w.) and acute DHEA treatment with the highest dose applied (50 mg/kg b.w.), inhibited the increase in GFAP expression induced by the denervation of the olfactory bulb. Furthermore, GFAP and vimentin immunostaining in the glomerular layer of the olfactory bulb were diminished in the denervated and DHEA treated groups. However, when DHEA treatment was combined with fadrozole administration, such a decrease in GFAP expression could not be detected in the chemically denervated olfactory bulb. These findings indicate that DHEA, depending on the dose applied and the mode of administration, attenuates glial reaction to denervation and may regulate glial plasticity in the olfactory glomeruli. These effects are likely to be mediated at least in part by the conversion of DHEA to estradiol.
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Affiliation(s)
- Zsófia Hoyk
- Institute of Biophysics, Biological Research Center, Szeged, Hungary
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20
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Abstract
The polysialylated, embryonic form of the neuronal cell adhesion molecule (PSA-NCAM) is known to participate in a whole series of synaptic rearrangements even in adult animals. The possible role of this molecule in neuroplastic changes of the adult rat somatosensory cortex induced by unilateral transection of the infraorbital branch of the trigeminal nerve was studied with PSA-NCAM immunostaining at light microscopic level. Two- and three-month-old CFY albino rats were sacrificied on days 1, 4, 6, 14 and 21 following operation and PSA-NCAM immunoreaction was examined at three levels of the vibrissa-cortex neuraxis, namely, in the principal nucleus of the trigeminal nerve, in the ventral posteromedial nucleus of the thalamus and in the somatosensory cortex. The lower levels of the neuraxis remained free of PSA-NCAM labeling, similarly to control, intact animals. However, a large number of scattered small neurons became PSA-NCAM immunoreactive in layers IV-VI on both ipsi- and contralateral sides of the somatosensory cortex from day 6 onwards, suggesting a possible transynaptic regulation of NCAM sialylation state.
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Affiliation(s)
- Zsófia Hoyk
- Laboratory of Molecular Neurobiology, Institute of Biophysics, Biological Research Center, Szeged, Hungary
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21
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Parducz A, Hoyk Z, Kis Z, Garcia-Segura LM. Hormonal enhancement of neuronal firing is linked to structural remodelling of excitatory and inhibitory synapses. Eur J Neurosci 2002; 16:665-70. [PMID: 12270042 DOI: 10.1046/j.1460-9568.2002.02127.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The ovarian hormone estradiol induces morphological changes in the number of synaptic inputs in specific neuronal populations. However, the functional significance of these changes is still unclear. In this study, the effect of estradiol on the number of anatomically identified synaptic inputs has been assessed in the hypothalamic arcuate nucleus. The number of axo-somatic, axodendritic and spine synapses was evaluated using unbiased stereological methods and a parallel electrophysiological study was performed to assess whether synaptic anatomical remodelling has a functional consequence on the activity of the affected neurons. Estradiol administration to ovariectomized rats induced a decrease in the number of inhibitory synaptic inputs, an increase in the number of excitatory synapses and an enhancement of the frequency of neuronal firing. These results indicate that oestrogen modifications in firing frequency in arcuate neurons are temporally linked to anatomical modifications in the numerical balance of inhibitory and excitatory synaptic inputs.
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Affiliation(s)
- A Parducz
- Laboratory of Molecular Neurobiology, Institute of Biophysics, Biological Research Center, H-6701 Szeged, Hungary.
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22
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Hoyk Z, Parducz A, Theodosis DT. The highly sialylated isoform of the neural cell adhesion molecule is required for estradiol-induced morphological synaptic plasticity in the adult arcuate nucleus. Eur J Neurosci 2001; 13:649-56. [PMID: 11207800 DOI: 10.1046/j.1460-9568.2001.01427.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The large quantities of polysialic acid (PSA) characterizing highly sialylated isoform of the neural cell adhesion molecule (PSA-NCAM), greatly reduce cell adhesion and render this particular cell surface adhesion molecule a likely candidate to intervene in dynamic neuronal phenomena, such as synaptic plasticity. The hypothalamic arcuate nucleus expresses high levels of PSA-NCAM and maintains a high capacity for neuroplastic changes in the adult. Thus, in the arcuate nucleus of female rats, varying circulating levels of estrogen give rise to a reversible reduction in the number of axo-somatic GABA synapses, together with a changing ensheathing of neuronal somata by astrocytes. To examine the role of PSA in such changes, we perturbed its expression, either by blockade with antibodies raised against this carbohydrate moiety (delivered intracerebroventricularly), or by its enzymatic cleavage after microinjection of endoneuraminidase N over the arcuate nucleus. Either procedure was performed in ovariectomized adult rats that received concurrent treatment with 17 beta-estradiol. Morphological synaptic plasticity was analysed using the unbiased disector method to assess synaptic densities in ultrathin sections of the arcuate nucleus immunogold-labelled for GABA. As expected, 17 beta-estradiol induced a significant reduction in the number of GABAergic axo-somatic synapses, a reduction which did not occur after infusion of anti-PSA antibodies or in vivo enzymatic removal of PSA from NCAM. Taken together, our results provide strong evidence that the presence of large quantities of the PSA moiety on NCAM is a necessary prerequisite for estrogen-induced phasic remodelling of synapses in the adult female arcuate nucleus.
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Affiliation(s)
- Z Hoyk
- Laboratory of Molecular Neurobiology, Institute of Biophysics, Biological Research Center, H-6701 Szeged, Hungary
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23
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Abstract
In acute experiments, the effects of i.p. 17beta-estradiol on the activity of arcuate neurons were studied in ovariectomized rats. 17Beta-estradiol (100 microg/100g, i.p.) increased the spontaneous activity of the observed arcuate neurons with a latency of 20-25 min. In some neurons spontaneous activity could be influenced by stimulation of the olfactory and somatosensory systems. Activation of the trigeminal system significantly increased the spontaneous activity of the studied units, while stimulation of the accessory olfactory bulb decreased it, both with and without 17beta-estradiol treatment. It is suggested that the 20-25 min latency of the 17beta-estradiol effect is based not so much on membrane as on genomic mechanisms. This suggestion is supported by immunocytochemical studies: 17beta-estradiol treatment significantly decreased the number of GABA-positive axo-somatic synapses in the arcuate nucleus.
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Affiliation(s)
- Z Kis
- Department of Comparative Physiology, József Attila University, Szeged, Hungary
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Hoyk Z, Szilágyi T, Halász N. Modulation by thyroid hormones of the development of external plexiform layer in the rat olfactory bulb. Neurobiology (Bp) 1996; 4:45-57. [PMID: 9116694] [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: 02/04/2023]
Abstract
Width of the external plexiform layer in olfactory bulbs and mean area of mitral and granule cell dendritic and glial processes were measured of normal, hypo- and hyperthyroid rat pups at the age of 24 days. Hypothyroidism was induced by treating the rats with a reversible goitrogen 6-n-propyl-2-thiouracil dissolved in their drinking water, while the hyperthyroid group was given water containing thyroxine. The 6-n-propyl-2-thiouracil treatment was begun on gestational day 18 and on the day of birth. Thyroxine treatment started on the day of birth. Both treatments were continued till the day of sacrifice. A significant decrease in the width of the external plexiform layer of the olfactory bulb in the prenatally 6-n-propyl-2-thiouracil treated group and a significant increase in the width of the external plexiform layer of the hyperthyroid group was shown by the Student's paired t-test. The areas of neuronal and glial processes were measured at electron microscopic level by using an IBAS image analysing system. A significant decrease was found by the Kruskal-Wallis test and Dunn's range test in the mean area of (1) mitral cell dendrites in the prenatal 6-n-propyl-2-thiouracil treated group, (2) granule cell dendrites in both the postnatally 6-n-propyl-2-thiouracil treated and in the hyperthyroid groups and (3) glial processes in the thyroxine treated group comparing to controls.
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Affiliation(s)
- Z Hoyk
- Institute of Biophysics, Hungarian Academy of Sciences, Szeged, Hungary
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