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Kim J, Bustamante E, Sotonyi P, Maxwell ND, Parameswaran P, Kent JK, Wetsel WC, Soderblom EJ, Rácz B, Soderling SH. Presynaptic Rac1 in the hippocampus selectively regulates working memory. bioRxiv 2024:2024.03.18.585488. [PMID: 38562715 PMCID: PMC10983896 DOI: 10.1101/2024.03.18.585488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
One of the most extensively studied members of the Ras superfamily of small GTPases, Rac1 is an intracellular signal transducer that remodels actin and phosphorylation signaling networks. Previous studies have shown that Rac1-mediated signaling is associated with hippocampal-dependent working memory and longer-term forms of learning and memory and that Rac1 can modulate forms of both pre- and postsynaptic plasticity. How these different cognitive functions and forms of plasticity mediated by Rac1 are linked, however, is unclear. Here, we show that spatial working memory is selectively impaired following the expression of a genetically encoded Rac1-inhibitor at presynaptic terminals, while longer-term cognitive processes are affected by Rac1 inhibition at postsynaptic sites. To investigate the regulatory mechanisms of this presynaptic process, we leveraged new advances in mass spectrometry to identify the proteomic and post-translational landscape of presynaptic Rac1 signaling. We identified serine/threonine kinases and phosphorylated cytoskeletal signaling and synaptic vesicle proteins enriched with active Rac1. The phosphorylated sites in these proteins are at positions likely to have regulatory effects on synaptic vesicles. Consistent with this, we also report changes in the distribution and morphology of synaptic vesicles and in postsynaptic ultrastructure following presynaptic Rac1 inhibition. Overall, this study reveals a previously unrecognized presynaptic role of Rac1 signaling in cognitive processes and provides insights into its potential regulatory mechanisms.
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Affiliation(s)
- Jaebin Kim
- Department of Cell Biology, Duke University Medical School, Durham, North Carolina, USA
| | - Edwin Bustamante
- Department of Cell Biology, Duke University Medical School, Durham, North Carolina, USA
| | - Peter Sotonyi
- Department of Anatomy and Histology, University of Veterinary Medicine, Budapest, Hungary
| | - Nicholas D Maxwell
- Department of Cell Biology, Duke University Medical School, Durham, North Carolina, USA
| | - Pooja Parameswaran
- Department of Cell Biology, Duke University Medical School, Durham, North Carolina, USA
| | - Julie K Kent
- Department of Cell Biology, Duke University Medical School, Durham, North Carolina, USA
| | - William C Wetsel
- Department of Cell Biology, Duke University Medical School, Durham, North Carolina, USA
- Mouse Behavioral and Neuroendocrine Analysis Core Facility, Duke University Medical School, Durham, North Carolina, USA
- Department of Neurobiology, Duke University Medical School, Durham, North Carolina, USA
| | - Erik J Soderblom
- Department of Cell Biology, Duke University Medical School, Durham, North Carolina, USA
- Mouse Behavioral and Neuroendocrine Analysis Core Facility, Duke University Medical School, Durham, North Carolina, USA
| | - Bence Rácz
- Department of Anatomy and Histology, University of Veterinary Medicine, Budapest, Hungary
| | - Scott H Soderling
- Department of Cell Biology, Duke University Medical School, Durham, North Carolina, USA
- Department of Neurobiology, Duke University Medical School, Durham, North Carolina, USA
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Palkovicsné Pézsa N, Kovács D, Somogyi F, Karancsi Z, Móritz AV, Jerzsele Á, Rácz B, Farkas O. Effects of Lactobacillus rhamnosus DSM7133 on Intestinal Porcine Epithelial Cells. Animals (Basel) 2023; 13:3007. [PMID: 37835613 PMCID: PMC10571805 DOI: 10.3390/ani13193007] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 07/27/2023] [Accepted: 09/22/2023] [Indexed: 10/15/2023] Open
Abstract
Antimicrobial resistance is one of the biggest health challenges nowadays. Probiotics are promising candidates as feed additives contributing to the health of the gastrointestinal tract. The beneficial effect of probiotics is species/strain specific; the potential benefits need to be individually assessed for each probiotic strain or species. We established a co-culture model, in which gastrointestinal infection was modeled using Escherichia coli (E. coli) and Salmonella enterica serovar Typhimurium (S. enterica serovar Typhimurium). Using intestinal porcine epithelial cells (IPEC-J2), the effects of pre-, co-, and post-treatment with Lactobacillus (L.) rhamnosus on the barrier function, intracellular (IC) reactive oxygen species (ROS) production, proinflammatory cytokine (IL-6 and IL-8) response, and adhesion inhibition were tested. E. coli- and S. Typhimurium-induced barrier impairment and increased ROS production could be counteracted using L. rhamnosus (p < 0.01). S. Typhimurium-induced IL-6 production was reduced via pre-treatment (p < 0.05) and post-treatment (p < 0.01); increased IL-8 secretion was decreased via pre-, co-, and post-treatment (p < 0.01) with L. rhamnosus. L. rhamnosus demonstrated significant inhibition of adhesion for both S. Typhimurium (p < 0.001) and E. coli (p < 0.001 in both pre-treatment and post-treatment; p < 0.05 in co-treatment). This study makes a substantial contribution to the understanding of the specific benefits of L. rhamnosus. Our findings can serve as a basis for further in vivo studies carried out in pigs and humans.
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Affiliation(s)
- Nikolett Palkovicsné Pézsa
- Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary; (D.K.); (F.S.); (Z.K.); (A.V.M.); (Á.J.); (O.F.)
- National Laboratory of Infectious Animal Diseases, Antimicrobial Resistance, Veterinary Public Health and Food Chain Safety, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary
| | - Dóra Kovács
- Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary; (D.K.); (F.S.); (Z.K.); (A.V.M.); (Á.J.); (O.F.)
- National Laboratory of Infectious Animal Diseases, Antimicrobial Resistance, Veterinary Public Health and Food Chain Safety, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary
| | - Fanni Somogyi
- Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary; (D.K.); (F.S.); (Z.K.); (A.V.M.); (Á.J.); (O.F.)
| | - Zita Karancsi
- Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary; (D.K.); (F.S.); (Z.K.); (A.V.M.); (Á.J.); (O.F.)
- National Laboratory of Infectious Animal Diseases, Antimicrobial Resistance, Veterinary Public Health and Food Chain Safety, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary
| | - Alma Virág Móritz
- Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary; (D.K.); (F.S.); (Z.K.); (A.V.M.); (Á.J.); (O.F.)
- National Laboratory of Infectious Animal Diseases, Antimicrobial Resistance, Veterinary Public Health and Food Chain Safety, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary
| | - Ákos Jerzsele
- Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary; (D.K.); (F.S.); (Z.K.); (A.V.M.); (Á.J.); (O.F.)
- National Laboratory of Infectious Animal Diseases, Antimicrobial Resistance, Veterinary Public Health and Food Chain Safety, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary
| | - Bence Rácz
- Department of Anatomy and Histology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary;
| | - Orsolya Farkas
- Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary; (D.K.); (F.S.); (Z.K.); (A.V.M.); (Á.J.); (O.F.)
- National Laboratory of Infectious Animal Diseases, Antimicrobial Resistance, Veterinary Public Health and Food Chain Safety, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary
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Lorászkó G, Vetter S, Rácz B, Sótonyi P, Ózsvári L. Comparison of Police Data on Animal Cruelty and the Perception of Animal Welfare NGOs in Hungary. Animals (Basel) 2023; 13:ani13071224. [PMID: 37048480 PMCID: PMC10093255 DOI: 10.3390/ani13071224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 03/29/2023] [Accepted: 03/29/2023] [Indexed: 04/03/2023] Open
Abstract
Animal cruelty has been a criminal offence in Hungary since 2004 and the legislator has tightened and differentiated the regulations in several waves since then. However, it is not an exaggeration to say that the public is often impatient and dissatisfied with the actions of the authorities in relation to animal cruelty. In our research, based on the data of the Criminal Investigation Department of the National Police Headquarters, we examined the opinions of 99 out of a total of 155 police stations in Hungary whose staff currently working there had experience in dealing with animal cruelty. The investigators gave their opinion on a total of 1169 cases in which some kind of police action was taken, either following a report to the police or as a result of their own investigative actions. In another survey, we questioned those members of society who are most committed to animal protection using a self-completion questionnaire. The questionnaire sent to the 116 Hungarian animal welfare non-governmental organisations (NGOs) on the publicly available lists was also posted for a short period on the social networking site of NGO activists. Among those who responded, a total of 150 identified as active participants in the animal protection work of these NGOs. The picture of the police treatment of animal cruelty, as perceived by NGOs working in the field of animal protection, is significantly less favourable than suggested by the police data. According to the official data, 77.7% of reports initiated an investigation, while the vast majority of animal welfare activists (81.3%) suspects that only 25% of the reports result in action by the prosecuting authority.
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Kocsis R, Süle J, Nagy P, Gál J, Tardy E, Császár G, Rácz B. Annual and seasonal trends in cow's milk quality determined by FT-MIR spectroscopy in Hungary between 2011 and 2020. Acta Vet Hung 2022; 70:207-214. [PMID: 36037047 DOI: 10.1556/004.2022.00019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 07/11/2022] [Indexed: 11/19/2022]
Abstract
We analysed and monitored the major chemical composition of cow's bulk milk by Fourier transform mid-infrared (FT-MIR) spectroscopy over a 10-year period in the whole territory of Hungary. In addition, the two most important key parameters for milk quality assessment, total bacterial count (TBC) and somatic cell count (SCC) were also followed. Production parameters showed significant seasonal and yearly changes. The overall mean fat, protein, lactose and solids-non-fat (SNF) contents of cow's milk were 3.81%, 3.32%, 4.74% and 8.76%, respectively. A circannual variation was observed in the chemical composition and yield of milk components of samples examined between 2011 and 2020. Concerning milk fat, milk protein and SNF, the values were the lowest in summer and the highest in winter. In the case of lactose, the minimum values were measured in autumn and the maximum values in spring. An obvious trend of long-term elevation of lactose and SNF was found in the raw cow milk samples over the observed period. The overall mean TBC and SCC of cow's milk were 52 × 103 CFU ml-1 and 270 × 103 cells/ml, respectively. Although there were differences in the monthly average values, no seasonal cyclicality was observed.
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Affiliation(s)
- Róbert Kocsis
- 1 Hungarian Dairy Research Institute Ltd., Mosonmagyaróvár, Hungary
| | - Judit Süle
- 1 Hungarian Dairy Research Institute Ltd., Mosonmagyaróvár, Hungary
| | - Péter Nagy
- 2 Emirates Industry for Camel Milk and Products, Farm and Veterinary Department, Dubai, United Arab Emirates
| | - Judit Gál
- 1 Hungarian Dairy Research Institute Ltd., Mosonmagyaróvár, Hungary
| | - Emília Tardy
- 1 Hungarian Dairy Research Institute Ltd., Mosonmagyaróvár, Hungary
| | - Gábor Császár
- 1 Hungarian Dairy Research Institute Ltd., Mosonmagyaróvár, Hungary
| | - Bence Rácz
- 3 Department of Anatomy and Histology, University of Veterinary Medicine, Budapest, Hungary
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Endle H, Horta G, Stutz B, Muthuraman M, Tegeder I, Schreiber Y, Snodgrass IF, Gurke R, Liu ZW, Sestan-Pesa M, Radyushkin K, Streu N, Fan W, Baumgart J, Li Y, Kloss F, Groppa S, Opel N, Dannlowski U, Grabe HJ, Zipp F, Rácz B, Horvath TL, Nitsch R, Vogt J. AgRP neurons control feeding behaviour at cortical synapses via peripherally derived lysophospholipids. Nat Metab 2022; 4:683-692. [PMID: 35760867 PMCID: PMC9940119 DOI: 10.1038/s42255-022-00589-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 05/17/2022] [Indexed: 01/13/2023]
Abstract
Phospholipid levels are influenced by peripheral metabolism. Within the central nervous system, synaptic phospholipids regulate glutamatergic transmission and cortical excitability. Whether changes in peripheral metabolism affect brain lipid levels and cortical excitability remains unknown. Here, we show that levels of lysophosphatidic acid (LPA) species in the blood and cerebrospinal fluid are elevated after overnight fasting and lead to higher cortical excitability. LPA-related cortical excitability increases fasting-induced hyperphagia, and is decreased following inhibition of LPA synthesis. Mice expressing a human mutation (Prg-1R346T) leading to higher synaptic lipid-mediated cortical excitability display increased fasting-induced hyperphagia. Accordingly, human subjects with this mutation have higher body mass index and prevalence of type 2 diabetes. We further show that the effects of LPA following fasting are under the control of hypothalamic agouti-related peptide (AgRP) neurons. Depletion of AgRP-expressing cells in adult mice decreases fasting-induced elevation of circulating LPAs, as well as cortical excitability, while blunting hyperphagia. These findings reveal a direct influence of circulating LPAs under the control of hypothalamic AgRP neurons on cortical excitability, unmasking an alternative non-neuronal route by which the hypothalamus can exert a robust impact on the cortex and thereby affect food intake.
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Affiliation(s)
- Heiko Endle
- Department of Molecular and Translational Neuroscience of Anatomy II, University of Cologne, Cologne, Germany
- Cluster of Excellence-Cellular Stress Response in Aging-Associated Diseases, Center of Molecular Medicine Cologne, University of Cologne, Cologne, Germany
- Department of Comparative Medicine, Yale School of Medicine, New Haven, CT, USA
- Department of Neurology, Focus Program Translational Neuroscience (FTN) and Immunotherapy (FZI), Rhine Main Neuroscience Network (rmn2), University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
| | - Guilherme Horta
- Focus Program Translational Neuroscience, Johannes Gutenberg-University, Mainz, Germany
- Translational Animal Research Center, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
- Institute for Microscopic Anatomy and Neurobiology, Johannes Gutenberg-University, Mainz, Germany
| | - Bernardo Stutz
- Department of Comparative Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Muthuraman Muthuraman
- Department of Neurology, Focus Program Translational Neuroscience (FTN) and Immunotherapy (FZI), Rhine Main Neuroscience Network (rmn2), University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
| | - Irmgard Tegeder
- Institute of Clinical Pharmacology, Goethe-University, Frankfurt am Main, Germany
| | - Yannick Schreiber
- Fraunhofer Institute for Translational Medicine and Pharmacology and Fraunhofer Cluster of Excellence for Immune Mediated Diseases, Frankfurt am Main, Germany
| | - Isabel Faria Snodgrass
- Fraunhofer Institute for Translational Medicine and Pharmacology and Fraunhofer Cluster of Excellence for Immune Mediated Diseases, Frankfurt am Main, Germany
| | - Robert Gurke
- Fraunhofer Institute for Translational Medicine and Pharmacology and Fraunhofer Cluster of Excellence for Immune Mediated Diseases, Frankfurt am Main, Germany
| | - Zhong-Wu Liu
- Department of Comparative Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Matija Sestan-Pesa
- Department of Comparative Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Konstantin Radyushkin
- Focus Program Translational Neuroscience, Johannes Gutenberg-University, Mainz, Germany
- Translational Animal Research Center, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
| | - Nora Streu
- Focus Program Translational Neuroscience, Johannes Gutenberg-University, Mainz, Germany
| | - Wei Fan
- Focus Program Translational Neuroscience, Johannes Gutenberg-University, Mainz, Germany
| | - Jan Baumgart
- Translational Animal Research Center, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
| | - Yan Li
- Transfer Group Antiinfectives, Leibniz Institute for Natural Product Research and Infection Biology, Hans Knöll Institute, Jena, Germany
| | - Florian Kloss
- Transfer Group Antiinfectives, Leibniz Institute for Natural Product Research and Infection Biology, Hans Knöll Institute, Jena, Germany
| | - Sergiu Groppa
- Department of Neurology, Focus Program Translational Neuroscience (FTN) and Immunotherapy (FZI), Rhine Main Neuroscience Network (rmn2), University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
| | - Nils Opel
- Institute of Translational Psychiatry, Westfälische Wilhelms University, Münster, Germany
| | - Udo Dannlowski
- Institute of Translational Psychiatry, Westfälische Wilhelms University, Münster, Germany
| | - Hans J Grabe
- Department of Psychiatry and Psychotherapy, University Medicine Greifswald, Greifswald, Germany
| | - Frauke Zipp
- Department of Neurology, Focus Program Translational Neuroscience (FTN) and Immunotherapy (FZI), Rhine Main Neuroscience Network (rmn2), University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
| | - Bence Rácz
- Department of Anatomy and Histology, University of Veterinary Medicine, Budapest, Hungary
| | - Tamas L Horvath
- Cluster of Excellence-Cellular Stress Response in Aging-Associated Diseases, Center of Molecular Medicine Cologne, University of Cologne, Cologne, Germany.
- Department of Comparative Medicine, Yale School of Medicine, New Haven, CT, USA.
- Department of Anatomy and Histology, University of Veterinary Medicine, Budapest, Hungary.
| | - Robert Nitsch
- Institute for Translational Neuroscience, Westfälische Wilhelms University, Münster, Germany.
| | - Johannes Vogt
- Department of Molecular and Translational Neuroscience of Anatomy II, University of Cologne, Cologne, Germany.
- Cluster of Excellence-Cellular Stress Response in Aging-Associated Diseases, Center of Molecular Medicine Cologne, University of Cologne, Cologne, Germany.
- Department of Neurology, Focus Program Translational Neuroscience (FTN) and Immunotherapy (FZI), Rhine Main Neuroscience Network (rmn2), University Medical Center of the Johannes Gutenberg-University, Mainz, Germany.
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Lorászkó G, Rácz B, Ózsvári L. Changes in the Dentition of Small Dogs up to 4 Months of Age. Animals (Basel) 2022; 12:ani12111417. [PMID: 35681881 PMCID: PMC9179271 DOI: 10.3390/ani12111417] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 03/31/2022] [Revised: 05/27/2022] [Accepted: 05/30/2022] [Indexed: 12/22/2022] Open
Abstract
Simple Summary National and EU legislation impose age restrictions for the rabies vaccination which is required in the export of dogs. This makes it important to know whether a particular dog is older than three months or not. In veterinary practice, age estimation is mostly based on dentition, although there is no standardized method described in the literature for determining the age of dogs under four months old and we found considerable variation in the references. We observed and recorded the changes in cranial shape and dentition of two Yorkshire Terriers born by caesarean section on 2 March 2018 up to four months of age. At the age of three months, both individuals showed the same characteristics of a wide gap between the upper maxillary incisors (i2 and i3) and the lower maxillary incisor and canine (i3 and c). Abstract It is common practice in EU member states to permit the entry of dogs vaccinated against rabies at the age of at least 3 months. In the absence of easily applicable comparative data, subjective disputes emerge around age. The aim of our study was to observe the development of dog teeth. During birth, an abnormally lying Yorkshire Terrier fetus was stuck in the birth canal, which led to a caesarean section, hence, the exact date of birth was known. For the next 4 months, two puppies were examined weekly, and they showed the same development. The dogs were born without teeth. At the age of 4.5 weeks, the canines I appeared, together with the adjacent incisors (i3), and the second incisor (i2) also erupted at the age of 6 weeks. A week later, a first incisor (i1) also appeared. From the age of 2.5 months, the distance between the teeth was increasing, especially on the upper dental arch. At 3.5 months of age, only the bottom front incisors (i1) had not grown in a row, and the significant distance between the top incisors, comparable to the width of the tooth, was striking. Since only two dogs of one breed were involved in this case study, the observations cannot be generalized.
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Affiliation(s)
- Gábor Lorászkó
- Department of Anatomy and Histology, University of Veterinary Medicine, H-1078 Budapest, Hungary; (G.L.); (B.R.)
| | - Bence Rácz
- Department of Anatomy and Histology, University of Veterinary Medicine, H-1078 Budapest, Hungary; (G.L.); (B.R.)
| | - László Ózsvári
- Department of Veterinary Forensics and Economics, University of Veterinary Medicine, H-1078 Budapest, Hungary
- Correspondence:
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Palkovicsné Pézsa N, Kovács D, Gálfi P, Rácz B, Farkas O. Effect of Enterococcus faecium NCIMB 10415 on Gut Barrier Function, Internal Redox State, Proinflammatory Response and Pathogen Inhibition Properties in Porcine Intestinal Epithelial Cells. Nutrients 2022; 14:nu14071486. [PMID: 35406099 PMCID: PMC9002907 DOI: 10.3390/nu14071486] [Citation(s) in RCA: 4] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 03/30/2022] [Accepted: 04/01/2022] [Indexed: 01/14/2023] Open
Abstract
In farm animals, intestinal diseases caused by Salmonella spp. and Escherichia coli may lead to significant economic loss. In the past few decades, the swine industry has largely relied on the prophylactic use of antibiotics to control gastrointestinal diseases. The development of antibiotic resistance has become an important issue both in animal and human health. The use of antibiotics for prophylactic purposes has been banned, moreover the new EU regulations further restrict the application of antibiotics in veterinary use. The swine industry seeks alternatives that are capable of maintaining the health of the gastrointestinal tract. Probiotics offer a promising alternative; however, their mode of action is not fully understood. In our experiments, porcine intestinal epithelial cells (IPEC-J2 cells) were challenged by Salmonella Typhimurium or Escherichia coli and we aimed at determining the effect of pre-, co-, and post-treatment with Enterococcus faecium NCIMB 10415 on the internal redox state, paracellular permeability, IL-6 and IL-8 secretion of IPEC-J2 cells. Moreover, the adhesion inhibition effect was also investigated. Enterococcus faecium was able to reduce oxidative stress and paracellular permeability of IPEC-J2 cells and could inhibit the adhesion of Salmonella Typhimurium and Escherichia coli. Based on our results, Enterococcus faecium is a promising candidate to maintain the health of the gastrointestinal tract.
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Affiliation(s)
- Nikolett Palkovicsné Pézsa
- Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary; (D.K.); (P.G.); (O.F.)
- Correspondence:
| | - Dóra Kovács
- Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary; (D.K.); (P.G.); (O.F.)
| | - Péter Gálfi
- Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary; (D.K.); (P.G.); (O.F.)
| | - Bence Rácz
- Department of Anatomy and Histology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary;
| | - Orsolya Farkas
- Department of Pharmacology and Toxicology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary; (D.K.); (P.G.); (O.F.)
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8
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Gómez-Valadés AG, Pozo M, Varela L, Boudjadja MB, Ramírez S, Chivite I, Eyre E, Haddad-Tóvolli R, Obri A, Milà-Guasch M, Altirriba J, Schneeberger M, Imbernón M, Garcia-Rendueles AR, Gama-Perez P, Rojo-Ruiz J, Rácz B, Alonso MT, Gomis R, Zorzano A, D'Agostino G, Alvarez CV, Nogueiras R, Garcia-Roves PM, Horvath TL, Claret M. Mitochondrial cristae-remodeling protein OPA1 in POMC neurons couples Ca 2+ homeostasis with adipose tissue lipolysis. Cell Metab 2021; 33:1820-1835.e9. [PMID: 34343501 PMCID: PMC8432968 DOI: 10.1016/j.cmet.2021.07.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 05/14/2021] [Accepted: 07/09/2021] [Indexed: 01/21/2023]
Abstract
Appropriate cristae remodeling is a determinant of mitochondrial function and bioenergetics and thus represents a crucial process for cellular metabolic adaptations. Here, we show that mitochondrial cristae architecture and expression of the master cristae-remodeling protein OPA1 in proopiomelanocortin (POMC) neurons, which are key metabolic sensors implicated in energy balance control, is affected by fluctuations in nutrient availability. Genetic inactivation of OPA1 in POMC neurons causes dramatic alterations in cristae topology, mitochondrial Ca2+ handling, reduction in alpha-melanocyte stimulating hormone (α-MSH) in target areas, hyperphagia, and attenuated white adipose tissue (WAT) lipolysis resulting in obesity. Pharmacological blockade of mitochondrial Ca2+ influx restores α-MSH and the lipolytic program, while improving the metabolic defects of mutant mice. Chemogenetic manipulation of POMC neurons confirms a role in lipolysis control. Our results unveil a novel axis that connects OPA1 in POMC neurons with mitochondrial cristae, Ca2+ homeostasis, and WAT lipolysis in the regulation of energy balance.
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Affiliation(s)
- Alicia G Gómez-Valadés
- Neuronal Control of Metabolism (NeuCoMe) Laboratory, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain.
| | - Macarena Pozo
- Neuronal Control of Metabolism (NeuCoMe) Laboratory, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain
| | - Luis Varela
- Program in Integrative Cell Signaling and Neurobiology of Metabolism, Department of Comparative Medicine, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Mehdi Boutagouga Boudjadja
- Faculty of Biology, Medicine and Health, School of Medical Sciences, University of Manchester, M13 9PT Manchester, UK
| | - Sara Ramírez
- Neuronal Control of Metabolism (NeuCoMe) Laboratory, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain
| | - Iñigo Chivite
- Neuronal Control of Metabolism (NeuCoMe) Laboratory, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain
| | - Elena Eyre
- Neuronal Control of Metabolism (NeuCoMe) Laboratory, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain
| | - Roberta Haddad-Tóvolli
- Neuronal Control of Metabolism (NeuCoMe) Laboratory, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain
| | - Arnaud Obri
- Neuronal Control of Metabolism (NeuCoMe) Laboratory, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain
| | - Maria Milà-Guasch
- Neuronal Control of Metabolism (NeuCoMe) Laboratory, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain
| | - Jordi Altirriba
- Laboratory of Metabolism, Department of Internal Medicine Specialties, Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland
| | - Marc Schneeberger
- Laboratory of Molecular Genetics, Howard Hughes Medical Institute, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA
| | - Mónica Imbernón
- Department of Physiology, Centro de Investigación en Medicina Molecular y Enfermedades Crónicas (CIMUS), University of Santiago de Compostela, Instituto de Investigación Sanitaria (IDIS), 15782 Santiago de Compostela, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), Madrid, Spain
| | - Angela R Garcia-Rendueles
- Neoplasia & Endocrine Differentiation, Centro de Investigación en Medicina Molecular y Enfermedades Crónicas (CIMUS), University of Santiago de Compostela, Instituto de Investigación Sanitaria (IDIS), 15782 Santiago de Compostela, Spain
| | - Pau Gama-Perez
- Departament de Ciències Fisiològiques, Universitat de Barcelona, 08907 Barcelona, Spain; Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), 08908 L'Hospitalet de Llobregat, Spain
| | - Jonathan Rojo-Ruiz
- Instituto de Biología y Genética Molecular (IBGM), Universidad de Valladolid y Consejo Superior de Investigaciones Científicas (CSIC), 47003 Valladolid, Spain
| | - Bence Rácz
- Department of Anatomy and Histology, University of Veterinary Medicine, 1078 Budapest, Hungary
| | - Maria Teresa Alonso
- Instituto de Biología y Genética Molecular (IBGM), Universidad de Valladolid y Consejo Superior de Investigaciones Científicas (CSIC), 47003 Valladolid, Spain
| | - Ramon Gomis
- Diabetes and Obesity Research Laboratory, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain; Department of Endocrinology and Nutrition, Hospital Clínic, School of Medicine, University of Barcelona, 08036 Barcelona, Spain; CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Madrid, Spain
| | - Antonio Zorzano
- CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Madrid, Spain; Departament de Bioquímica i Biomedicina Molecular, Facultat de Biologia, Universitat de Barcelona, 08028 Barcelona, Spain; Institute for Research in Biomedicine (IRB Barcelona), 08028 Barcelona, Spain
| | - Giuseppe D'Agostino
- Faculty of Biology, Medicine and Health, School of Medical Sciences, University of Manchester, M13 9PT Manchester, UK
| | - Clara V Alvarez
- Neoplasia & Endocrine Differentiation, Centro de Investigación en Medicina Molecular y Enfermedades Crónicas (CIMUS), University of Santiago de Compostela, Instituto de Investigación Sanitaria (IDIS), 15782 Santiago de Compostela, Spain
| | - Rubén Nogueiras
- Department of Physiology, Centro de Investigación en Medicina Molecular y Enfermedades Crónicas (CIMUS), University of Santiago de Compostela, Instituto de Investigación Sanitaria (IDIS), 15782 Santiago de Compostela, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), Madrid, Spain
| | - Pablo M Garcia-Roves
- Departament de Ciències Fisiològiques, Universitat de Barcelona, 08907 Barcelona, Spain; Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), 08908 L'Hospitalet de Llobregat, Spain
| | - Tamas L Horvath
- Program in Integrative Cell Signaling and Neurobiology of Metabolism, Department of Comparative Medicine, Yale University School of Medicine, New Haven, CT 06520, USA; Department of Anatomy and Histology, University of Veterinary Medicine, 1078 Budapest, Hungary
| | - Marc Claret
- Neuronal Control of Metabolism (NeuCoMe) Laboratory, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain; CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Madrid, Spain; School of Medicine, Universitat de Barcelona, 08036 Barcelona, Spain.
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9
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O'Neil SD, Rácz B, Brown WE, Gao Y, Soderblom EJ, Yasuda R, Soderling SH. Action potential-coupled Rho GTPase signaling drives presynaptic plasticity. eLife 2021; 10:63756. [PMID: 34269176 PMCID: PMC8285108 DOI: 10.7554/elife.63756] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 07/06/2021] [Indexed: 12/30/2022] Open
Abstract
In contrast to their postsynaptic counterparts, the contributions of activity-dependent cytoskeletal signaling to presynaptic plasticity remain controversial and poorly understood. To identify and evaluate these signaling pathways, we conducted a proteomic analysis of the presynaptic cytomatrix using in vivo biotin identification (iBioID). The resultant proteome was heavily enriched for actin cytoskeleton regulators, including Rac1, a Rho GTPase that activates the Arp2/3 complex to nucleate branched actin filaments. Strikingly, we find Rac1 and Arp2/3 are closely associated with synaptic vesicle membranes in adult mice. Using three independent approaches to alter presynaptic Rac1 activity (genetic knockout, spatially restricted inhibition, and temporal optogenetic manipulation), we discover that this pathway negatively regulates synaptic vesicle replenishment at both excitatory and inhibitory synapses, bidirectionally sculpting short-term synaptic depression. Finally, we use two-photon fluorescence lifetime imaging to show that presynaptic Rac1 activation is coupled to action potentials by voltage-gated calcium influx. Thus, this study uncovers a previously unrecognized mechanism of actin-regulated short-term presynaptic plasticity that is conserved across excitatory and inhibitory terminals. It also provides a new proteomic framework for better understanding presynaptic physiology, along with a blueprint of experimental strategies to isolate the presynaptic effects of ubiquitously expressed proteins.
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Affiliation(s)
| | - Bence Rácz
- Department of Anatomy and Histology, University of Veterinary Medicine, Budapest, Hungary
| | - Walter Evan Brown
- Department of Cell Biology, Duke University Medical Center, Durham, United States
| | - Yudong Gao
- Department of Cell Biology, Duke University Medical Center, Durham, United States
| | - Erik J Soderblom
- Department of Cell Biology, Duke University Medical Center, Durham, United States.,Proteomics and Metabolomics Shared Resource and Center for Genomic and Computational Biology, Duke University Medical Center, Durham, United States
| | - Ryohei Yasuda
- Max Planck Florida Institute for Neuroscience, Jupiter, United States
| | - Scott H Soderling
- Department of Neurobiology, Duke University Medical Center, Durham, United States.,Department of Cell Biology, Duke University Medical Center, Durham, United States
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10
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Schroeder S, Hofer SJ, Zimmermann A, Pechlaner R, Dammbrueck C, Pendl T, Marcello GM, Pogatschnigg V, Bergmann M, Müller M, Gschiel V, Ristic S, Tadic J, Iwata K, Richter G, Farzi A, Üçal M, Schäfer U, Poglitsch M, Royer P, Mekis R, Agreiter M, Tölle RC, Sótonyi P, Willeit J, Mairhofer B, Niederkofler H, Pallhuber I, Rungger G, Tilg H, Defrancesco M, Marksteiner J, Sinner F, Magnes C, Pieber TR, Holzer P, Kroemer G, Carmona-Gutierrez D, Scorrano L, Dengjel J, Madl T, Sedej S, Sigrist SJ, Rácz B, Kiechl S, Eisenberg T, Madeo F. Dietary spermidine improves cognitive function. Cell Rep 2021; 35:108985. [PMID: 33852843 DOI: 10.1016/j.celrep.2021.108985] [Citation(s) in RCA: 85] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 02/08/2021] [Accepted: 03/22/2021] [Indexed: 12/22/2022] Open
Abstract
Decreased cognitive performance is a hallmark of brain aging, but the underlying mechanisms and potential therapeutic avenues remain poorly understood. Recent studies have revealed health-protective and lifespan-extending effects of dietary spermidine, a natural autophagy-promoting polyamine. Here, we show that dietary spermidine passes the blood-brain barrier in mice and increases hippocampal eIF5A hypusination and mitochondrial function. Spermidine feeding in aged mice affects behavior in homecage environment tasks, improves spatial learning, and increases hippocampal respiratory competence. In a Drosophila aging model, spermidine boosts mitochondrial respiratory capacity, an effect that requires the autophagy regulator Atg7 and the mitophagy mediators Parkin and Pink1. Neuron-specific Pink1 knockdown abolishes spermidine-induced improvement of olfactory associative learning. This suggests that the maintenance of mitochondrial and autophagic function is essential for enhanced cognition by spermidine feeding. Finally, we show large-scale prospective data linking higher dietary spermidine intake with a reduced risk for cognitive impairment in humans.
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Affiliation(s)
- Sabrina Schroeder
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria; BioTechMed-Graz, 8010 Graz, Austria
| | - Sebastian J Hofer
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria; BioTechMed-Graz, 8010 Graz, Austria; Field of Excellence BioHealth, University of Graz, 8010 Graz, Austria
| | - Andreas Zimmermann
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria; Field of Excellence BioHealth, University of Graz, 8010 Graz, Austria
| | - Raimund Pechlaner
- Department of Neurology, Medical University of Innsbruck, 6020 Innsbruck, Austria
| | | | - Tobias Pendl
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria
| | - G Mark Marcello
- Department of Anatomy and Histology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary
| | - Viktoria Pogatschnigg
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria
| | - Martina Bergmann
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria
| | - Melanie Müller
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria
| | - Verena Gschiel
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria
| | - Selena Ristic
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria
| | - Jelena Tadic
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria; Field of Excellence BioHealth, University of Graz, 8010 Graz, Austria
| | - Keiko Iwata
- Veneto Institute of Molecular Medicine, 35129 Padova, Italy; Research Center for Child Mental Development, University of Fukui, 910-1193 Fukui, Japan; Department of Biology, University of Padova, 35121 Padova, Italy
| | - Gesa Richter
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging Molecular Biology and Biochemistry Medical University of Graz, 8010 Graz, Austria
| | - Aitak Farzi
- Otto Loewi Research Center (for Vascular Biology, Immunology and Inflammation), Division of Pharmacology, Medical University of Graz (MUG), 8010 Graz, Austria
| | - Muammer Üçal
- Department of Neurosurgery, RU Experimental Neurotraumatology, Medical University Graz, 8036 Graz, Austria
| | - Ute Schäfer
- Department of Neurosurgery, RU Experimental Neurotraumatology, Medical University Graz, 8036 Graz, Austria
| | - Michael Poglitsch
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria
| | - Philipp Royer
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria
| | - Ronald Mekis
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria
| | - Marlene Agreiter
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria
| | - Regine C Tölle
- Department of Biology, University of Fribourg, Chemin du Musée 10, 1700 Fribourg, Switzerland
| | - Péter Sótonyi
- Department of Anatomy and Histology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary
| | - Johann Willeit
- Department of Neurology, Medical University of Innsbruck, 6020 Innsbruck, Austria
| | | | | | | | | | - Herbert Tilg
- Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology and Metabolism, Medical University of Innsbruck, 6020 Innsbruck, Austria
| | - Michaela Defrancesco
- Department of Psychiatry, Psychotherapy and Psychosomatics, Medical University of Innsbruck, 6020 Innsbruck, Austria
| | - Josef Marksteiner
- Department of Psychiatry and Psychotherapy A, Hall State Hospital, 6060 Hall in Tirol, Austria
| | - Frank Sinner
- HEALTH-Institute for Biomedicine and Health Sciences, Joanneum Research Forschungsgesellschaft mbH, 8010 Graz, Austria; Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, 8036 Graz, Austria
| | - Christoph Magnes
- HEALTH-Institute for Biomedicine and Health Sciences, Joanneum Research Forschungsgesellschaft mbH, 8010 Graz, Austria
| | - Thomas R Pieber
- BioTechMed-Graz, 8010 Graz, Austria; HEALTH-Institute for Biomedicine and Health Sciences, Joanneum Research Forschungsgesellschaft mbH, 8010 Graz, Austria; Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, 8036 Graz, Austria
| | - Peter Holzer
- Otto Loewi Research Center (for Vascular Biology, Immunology and Inflammation), Division of Pharmacology, Medical University of Graz (MUG), 8010 Graz, Austria
| | - Guido Kroemer
- Equipe Labellisée par la Ligue Contre le Cancer, Université Paris Descartes, Université Paris Diderot, Université Sorbonne Paris Cité, INSERM U1138, Centre de Recherche des Cordeliers, 75006 Paris, France; Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, 94 805 Villejuif, France; Pôle de Biologie, Hôpital Européen Georges Pompidou, AP-HP, 75015 Paris, France; Suzhou Institute for Systems Biology, Chinese Academy of Sciences, 215123 Suzhou, China; Department of Women's and Children's Health, Karolinska University Hospital, 171 77 Stockholm, Sweden
| | | | - Luca Scorrano
- Veneto Institute of Molecular Medicine, 35129 Padova, Italy; Department of Biology, University of Padova, 35121 Padova, Italy
| | - Jörn Dengjel
- Department of Biology, University of Fribourg, Chemin du Musée 10, 1700 Fribourg, Switzerland
| | - Tobias Madl
- BioTechMed-Graz, 8010 Graz, Austria; Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging Molecular Biology and Biochemistry Medical University of Graz, 8010 Graz, Austria
| | - Simon Sedej
- BioTechMed-Graz, 8010 Graz, Austria; Department of Cardiology, Medical University of Graz, 8036 Graz, Austria; Faculty of Medicine, University of Maribor, 2000 Maribor, Slovenia
| | - Stephan J Sigrist
- Institute of Biology/Genetics, Freie Universität Berlin, 14195 Berlin, Germany
| | - Bence Rácz
- Department of Anatomy and Histology, University of Veterinary Medicine Budapest, 1078 Budapest, Hungary
| | - Stefan Kiechl
- Department of Neurology, Medical University of Innsbruck, 6020 Innsbruck, Austria; VASCage, Research Centre on Vascular Ageing and Stroke, 6020 Innsbruck, Austria.
| | - Tobias Eisenberg
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria; BioTechMed-Graz, 8010 Graz, Austria; Field of Excellence BioHealth, University of Graz, 8010 Graz, Austria.
| | - Frank Madeo
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010 Graz, Austria; BioTechMed-Graz, 8010 Graz, Austria; Field of Excellence BioHealth, University of Graz, 8010 Graz, Austria.
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11
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Szabó LE, Marcello GM, Süth M, Sótonyi P, Rácz B. Distribution of cortactin in cerebellar Purkinje cell spines. Sci Rep 2021; 11:1375. [PMID: 33446758 PMCID: PMC7809465 DOI: 10.1038/s41598-020-80469-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 12/22/2020] [Indexed: 01/29/2023] Open
Abstract
Dendritic spines are the primary sites of excitatory transmission in the mammalian brain. Spines of cerebellar Purkinje Cells (PCs) are plastic, but they differ from forebrain spines in a number of important respects, and the mechanisms of spine plasticity differ between forebrain and cerebellum. Our previous studies indicate that in hippocampal spines cortactin-a protein that stabilizes actin branch points-resides in the spine core, avoiding the spine shell. To see whether the distribution of cortactin differs in PC spines, we examined its subcellular organization using quantitative preembedding immunoelectron microscopy. We found that cortactin was enriched in the spine shell, associated with the non-synaptic membrane, and was also situated within the postsynaptic density (PSD). This previously unrecognized distribution of cortactin within PC spines may underlie structural and functional differences in excitatory spine synapses between forebrain, and cerebellum.
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Affiliation(s)
- Lilla E. Szabó
- grid.483037.b0000 0001 2226 5083Department of Anatomy and Histology, University of Veterinary Medicine Budapest, István u. 2., 1078 Budapest, Hungary
| | - G. Mark Marcello
- grid.483037.b0000 0001 2226 5083Department of Anatomy and Histology, University of Veterinary Medicine Budapest, István u. 2., 1078 Budapest, Hungary
| | - Miklós Süth
- grid.483037.b0000 0001 2226 5083Department of Anatomy and Histology, University of Veterinary Medicine Budapest, István u. 2., 1078 Budapest, Hungary
| | - Péter Sótonyi
- grid.483037.b0000 0001 2226 5083Department of Anatomy and Histology, University of Veterinary Medicine Budapest, István u. 2., 1078 Budapest, Hungary
| | - Bence Rácz
- grid.483037.b0000 0001 2226 5083Department of Anatomy and Histology, University of Veterinary Medicine Budapest, István u. 2., 1078 Budapest, Hungary
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12
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Maglione M, Kochlamazashvili G, Eisenberg T, Rácz B, Michael E, Toppe D, Stumpf A, Wirth A, Zeug A, Müller FE, Moreno-Velasquez L, Sammons RP, Hofer SJ, Madeo F, Maritzen T, Maier N, Ponimaskin E, Schmitz D, Haucke V, Sigrist SJ. Spermidine protects from age-related synaptic alterations at hippocampal mossy fiber-CA3 synapses. Sci Rep 2019; 9:19616. [PMID: 31873156 PMCID: PMC6927957 DOI: 10.1038/s41598-019-56133-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [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: 09/10/2019] [Accepted: 12/06/2019] [Indexed: 12/15/2022] Open
Abstract
Aging is associated with functional alterations of synapses thought to contribute to age-dependent memory impairment (AMI). While therapeutic avenues to protect from AMI are largely elusive, supplementation of spermidine, a polyamine normally declining with age, has been shown to restore defective proteostasis and to protect from AMI in Drosophila. Here we demonstrate that dietary spermidine protects from age-related synaptic alterations at hippocampal mossy fiber (MF)-CA3 synapses and prevents the aging-induced loss of neuronal mitochondria. Dietary spermidine rescued age-dependent decreases in synaptic vesicle density and largely restored defective presynaptic MF-CA3 long-term potentiation (LTP) at MF-CA3 synapses (MF-CA3) in aged animals. In contrast, spermidine failed to protect CA3-CA1 hippocampal synapses characterized by postsynaptic LTP from age-related changes in function and morphology. Our data demonstrate that dietary spermidine attenuates age-associated deterioration of MF-CA3 synaptic transmission and plasticity. These findings provide a physiological and molecular basis for the future therapeutic usage of spermidine.
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Affiliation(s)
- Marta Maglione
- Department of Biology, Chemistry, Pharmacy, Freie Universität Berlin, 14195, Berlin, Germany
- Department of Molecular Pharmacology and Cell Biology, Leibniz Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125, Berlin, Germany
- NeuroCure Cluster of Excellence, Charité Universitätsmedizin, 10117, Berlin, Germany
| | - Gaga Kochlamazashvili
- Department of Molecular Pharmacology and Cell Biology, Leibniz Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125, Berlin, Germany
| | - Tobias Eisenberg
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010, Graz, Austria
- BioTechMed-Graz, 8010, Graz, Austria
| | - Bence Rácz
- Department of Anatomy and Histology, University of Veterinary Medicine Budapest, 1078, Budapest, Hungary
| | - Eva Michael
- Department of Biology, Chemistry, Pharmacy, Freie Universität Berlin, 14195, Berlin, Germany
- NeuroCure Cluster of Excellence, Charité Universitätsmedizin, 10117, Berlin, Germany
| | - David Toppe
- Department of Biology, Chemistry, Pharmacy, Freie Universität Berlin, 14195, Berlin, Germany
- NeuroCure Cluster of Excellence, Charité Universitätsmedizin, 10117, Berlin, Germany
| | - Alexander Stumpf
- NeuroCure Cluster of Excellence, Charité Universitätsmedizin, 10117, Berlin, Germany
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 10117, Berlin, Germany
| | - Alexander Wirth
- Cellular Neurophysiology, Hannover Medical School, 30625, Hannover, Germany
| | - André Zeug
- Cellular Neurophysiology, Hannover Medical School, 30625, Hannover, Germany
| | - Franziska E Müller
- Cellular Neurophysiology, Hannover Medical School, 30625, Hannover, Germany
| | - Laura Moreno-Velasquez
- NeuroCure Cluster of Excellence, Charité Universitätsmedizin, 10117, Berlin, Germany
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 10117, Berlin, Germany
| | - Rosanna P Sammons
- NeuroCure Cluster of Excellence, Charité Universitätsmedizin, 10117, Berlin, Germany
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 10117, Berlin, Germany
| | - Sebastian J Hofer
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010, Graz, Austria
- BioTechMed-Graz, 8010, Graz, Austria
| | - Frank Madeo
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, 8010, Graz, Austria
- BioTechMed-Graz, 8010, Graz, Austria
| | - Tanja Maritzen
- Department of Molecular Pharmacology and Cell Biology, Leibniz Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125, Berlin, Germany
| | - Nikolaus Maier
- NeuroCure Cluster of Excellence, Charité Universitätsmedizin, 10117, Berlin, Germany
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 10117, Berlin, Germany
| | - Evgeni Ponimaskin
- Cellular Neurophysiology, Hannover Medical School, 30625, Hannover, Germany
| | - Dietmar Schmitz
- NeuroCure Cluster of Excellence, Charité Universitätsmedizin, 10117, Berlin, Germany
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 10117, Berlin, Germany
| | - Volker Haucke
- Department of Biology, Chemistry, Pharmacy, Freie Universität Berlin, 14195, Berlin, Germany.
- Department of Molecular Pharmacology and Cell Biology, Leibniz Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125, Berlin, Germany.
- NeuroCure Cluster of Excellence, Charité Universitätsmedizin, 10117, Berlin, Germany.
| | - Stephan J Sigrist
- Department of Biology, Chemistry, Pharmacy, Freie Universität Berlin, 14195, Berlin, Germany.
- NeuroCure Cluster of Excellence, Charité Universitätsmedizin, 10117, Berlin, Germany.
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13
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Lazaro MT, Taxidis J, Shuman T, Bachmutsky I, Ikrar T, Santos R, Marcello GM, Mylavarapu A, Chandra S, Foreman A, Goli R, Tran D, Sharma N, Azhdam M, Dong H, Choe KY, Peñagarikano O, Masmanidis SC, Rácz B, Xu X, Geschwind DH, Golshani P. Reduced Prefrontal Synaptic Connectivity and Disturbed Oscillatory Population Dynamics in the CNTNAP2 Model of Autism. Cell Rep 2019; 27:2567-2578.e6. [PMID: 31141683 PMCID: PMC6553483 DOI: 10.1016/j.celrep.2019.05.006] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 02/20/2019] [Accepted: 04/30/2019] [Indexed: 11/25/2022] Open
Abstract
Loss-of-function mutations in CNTNAP2 cause a syndromic form of autism spectrum disorder in humans and produce social deficits, repetitive behaviors, and seizures in mice. However, the functional effects of these mutations at cellular and circuit levels remain elusive. Using laser-scanning photostimulation, whole-cell recordings, and electron microscopy, we found a dramatic decrease in excitatory and inhibitory synaptic inputs onto L2/3 pyramidal neurons of the medial prefrontal cortex (mPFC) of Cntnap2 knockout (KO) mice, concurrent with reduced spines and synapses, despite normal dendritic complexity and intrinsic excitability. Moreover, recording of mPFC local field potentials (LFPs) and unit spiking in vivo revealed increased activity in inhibitory neurons, reduced phase-locking to delta and theta oscillations, and delayed phase preference during locomotion. Excitatory neurons showed similar phase modulation changes at delta frequencies. Finally, pairwise correlations increased during immobility in KO mice. Thus, reduced synaptic inputs can yield perturbed temporal coordination of neuronal firing in cortical ensembles.
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Affiliation(s)
- Maria T Lazaro
- Interdepartmental Program for Neuroscience, UCLA, Los Angeles, CA, USA; Center for Neurobehavioral Genetics, Semel Institute, UCLA, Los Angeles, CA, USA; Department of Neurology, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Jiannis Taxidis
- Department of Neurology, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA; Integrative Center for Learning and Memory, Brain Research Institute, UCLA, Los Angeles, CA, USA
| | - Tristan Shuman
- Department of Neurology, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA; Integrative Center for Learning and Memory, Brain Research Institute, UCLA, Los Angeles, CA, USA; Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Iris Bachmutsky
- Department of Neurology, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Taruna Ikrar
- Department of Anatomy and Neurobiology, UC Irvine, Irvine, CA, USA
| | - Rommel Santos
- Department of Anatomy and Neurobiology, UC Irvine, Irvine, CA, USA
| | - G Mark Marcello
- Department of Anatomy and Histology, University of Veterinary Medicine, Budapest, Hungary
| | - Apoorva Mylavarapu
- Department of Neurology, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Swasty Chandra
- Department of Neurology, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Allison Foreman
- Department of Neurology, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Rachna Goli
- Department of Neurology, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Duy Tran
- Department of Neurology, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Nikhil Sharma
- Department of Neurology, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Michelle Azhdam
- Department of Neurology, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Hongmei Dong
- Department of Neurology, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Katrina Y Choe
- Center for Neurobehavioral Genetics, Semel Institute, UCLA, Los Angeles, CA, USA
| | - Olga Peñagarikano
- Department of Pharmacology, School of Medicine, University of the Basque Country (UPV/EHU), Vizcaya, Spain; Centro de Investigación Biomédica en Red en Salud Mental (CIBERSAM), Madrid, Spain
| | - Sotiris C Masmanidis
- Integrative Center for Learning and Memory, Brain Research Institute, UCLA, Los Angeles, CA, USA
| | - Bence Rácz
- Department of Anatomy and Histology, University of Veterinary Medicine, Budapest, Hungary
| | - Xiangmin Xu
- Department of Anatomy and Neurobiology, UC Irvine, Irvine, CA, USA
| | - Daniel H Geschwind
- Center for Neurobehavioral Genetics, Semel Institute, UCLA, Los Angeles, CA, USA; Department of Neurology, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA; Center for Autism Research and Treatment, Semel Institute, UCLA, Los Angeles, CA, USA; Intellectual Development and Disabilities Research Center, UCLA, Los Angeles, CA, USA.
| | - Peyman Golshani
- Department of Neurology, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA; Integrative Center for Learning and Memory, Brain Research Institute, UCLA, Los Angeles, CA, USA; Intellectual Development and Disabilities Research Center, UCLA, Los Angeles, CA, USA; West Los Angeles VA Medical Center, Los Angeles, CA.
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14
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Podzimek Š, Dušková M, Broukal Z, Rácz B, Stárka L, Dušková J. The evolution of taste and perinatal programming of taste preferences. Physiol Res 2018; 67:S421-S429. [PMID: 30484669 DOI: 10.33549/physiolres.934026] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Taste is important for food intake. The fetus first experiences taste through amniotic fluid, and later via mother's milk. Early human experience with taste has a key importance for later acceptance of food. Dietary behavior is determined by the interaction of many different factors. The development of the olfactory and taste receptors begins at 7-8 weeks of gestation. An early sensitive period probably exists when flavor preference is established. Sweet taste is preferred in early childhood; this is the reason why children are at increased risk of over-consuming saccharides. Gustatory sensitivity declines with age. The threshold for the perception of each basic taste differs, and is established genetically. In this review, we summarize published data on taste preferences and its development and changes during life.
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Affiliation(s)
- Š Podzimek
- Institute of Dental Medicine, First Faculty of Medicine, Charles University, Prague, Czech Republic, Institute of Endocrinology, Prague, Czech Republic.
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15
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Abstract
Obesity is linked to a wide range of serious illnesses. In addition to the important impact on the health of the individual, obesity also has a substantial impact on the economy. Disruption of physiological day-night cycles could contribute to the increased incidence of obesity. According to the American National Sleep Federation, the percentage of the people who reported a sleep duration of six hours or less increased from 12 to 37 % over ten years. Insufficient sleep leads not only to an increase of the total calorie intake but changes the meal preference in favor of palatable foods and meals with high carbohydrate content. A decrease of leptin and increase of ghrelin levels caused by sleep deficiency can also play a role. In addition to the higher caloric intake, the timing of food consumption should be taken into account. The same meal eaten during the night versus the day is associated with increased postprandial glucose and triglyceride levels. The gut microbiome has also been recently understood as an endocrine system, with links between the gut microbiome and circadian rhythm changes possibly influencing increased obesity.
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Affiliation(s)
- B Rácz
- Institute of Endocrinology, Prague, Czech Republic.
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16
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Marcello GM, Szabó LE, Sótonyi P, Rácz B. Quantitative Electron Microscopic Assay Using Random Sampling from Single Sections to Test Plastic Synaptic Changes in Hippocampus. Bio Protoc 2018; 8:e2946. [PMID: 34395758 DOI: 10.21769/bioprotoc.2946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 07/10/2018] [Accepted: 07/13/2018] [Indexed: 11/02/2022] Open
Abstract
Studies over several decades on the organization of the CA1 hippocampus-a particularly favorable model for learning, memory and certain forms of cognition-have shown that the synaptic network in this brain region is plastic ( Fortin et al., 2012 ). Recent evidence suggests that a number of environmental and endogenous stimuli may have a substantial effect on hippocampus-dependent cognitive function, implying enhanced synaptic plasticity in this brain region. Stimuli (e.g., food restriction, enriched environment, social interaction, gene-loss [knock-out animals], etc.) can trigger structural and functional plasticity (e.g., spine formation, increased expression of neurotrophic factors, synaptic function and neurogenesis) in the hippocampus ( Stewart et al., 1989 ; Andrade et al., 2002 ; Babits et al., 2016 ). Using quantitative electron microscopy, we can study the synaptic neuropil of CA1 hippocampus in rodents during short- or long-term treatments and/or stimuli. Within the scope of this electron microscopic methodological construct, the density of various synaptic connections, the morphology and internal structure of excitatory spine synapses (e.g., the mean length and width of postsynaptic densities) can be quantified. Such quantitative ultrastructural measurement using high-resolution electron-microscopy may be applied to observe structural manifestations of synaptic plasticity in rodent brain tissue. The presented ultrastructural protocol may empower researchers to reveal details and synaptic changes which may not be obvious using only light microscopy. Ultrastructural data may provide substantial advances in our understanding of the changes in hippocampal synaptic architecture under different conditions.
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Affiliation(s)
- G Mark Marcello
- Department of Anatomy and Histology, University of Veterinary Medicine, Budapest, Hungary
| | - Lilla E Szabó
- Department of Anatomy and Histology, University of Veterinary Medicine, Budapest, Hungary
| | - Péter Sótonyi
- Department of Anatomy and Histology, University of Veterinary Medicine, Budapest, Hungary
| | - Bence Rácz
- Department of Anatomy and Histology, University of Veterinary Medicine, Budapest, Hungary
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17
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Liliom H, Tárnok K, Ábrahám Z, Rácz B, Hausser A, Schlett K. Protein kinase D exerts neuroprotective functions during oxidative stress via nuclear factor kappa B-independent signaling pathways. J Neurochem 2017; 142:948-961. [DOI: 10.1111/jnc.14131] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 06/28/2017] [Accepted: 07/05/2017] [Indexed: 12/25/2022]
Affiliation(s)
- Hanna Liliom
- Department of Physiology and Neurobiology; Eötvös Loránd University; Budapest Hungary
| | - Krisztián Tárnok
- Department of Physiology and Neurobiology; Eötvös Loránd University; Budapest Hungary
| | - Zsófia Ábrahám
- Department of Physiology and Neurobiology; Eötvös Loránd University; Budapest Hungary
| | - Bence Rácz
- Department of Anatomy and Histology; University of Veterinary Medicine; Budapest Hungary
| | - Angelika Hausser
- Institute of Cell Biology and Immunology; University Stuttgart; Stuttgart Germany
- Stuttgart Research Center Systems Biology; University of Stuttgart; Stuttgart Germany
| | - Katalin Schlett
- Department of Physiology and Neurobiology; Eötvös Loránd University; Budapest Hungary
- MTA-ELTE-NAP B - Neuronal Cell Biology Research Group; Eötvös Loránd University; Budapest Hungary
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18
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Vereczki VK, Veres JM, Müller K, Nagy GA, Rácz B, Barsy B, Hájos N. Synaptic Organization of Perisomatic GABAergic Inputs onto the Principal Cells of the Mouse Basolateral Amygdala. Front Neuroanat 2016; 10:20. [PMID: 27013983 PMCID: PMC4779893 DOI: 10.3389/fnana.2016.00020] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [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: 11/24/2015] [Accepted: 02/18/2016] [Indexed: 12/27/2022] Open
Abstract
Spike generation is most effectively controlled by inhibitory inputs that target the perisomatic region of neurons. Despite the critical importance of this functional domain, very little is known about the organization of the GABAergic inputs contacting the perisomatic region of principal cells (PCs) in the basolateral amygdala. Using immunocytochemistry combined with in vitro single-cell labeling we determined the number and sources of GABAergic inputs of PCs at light and electron microscopic levels in mice. We found that the soma and proximal dendrites of PCs were innervated primarily by two neurochemically distinct basket cell types expressing parvalbumin (PVBC) or cholecystokinin and CB1 cannabinoid receptors (CCK/CB1BC). The innervation of the initial segment of PC axons was found to be parceled out by PVBCs and axo-axonic cells (AAC), as the majority of GABAergic inputs onto the region nearest to the soma (between 0 and 10 μm) originated from PVBCs, while the largest portion of the axon initial segment was innervated by AACs. Detailed morphological investigations revealed that the three perisomatic region-targeting interneuron types significantly differed in dendritic and axonal arborization properties. We found that, although individual PVBCs targeted PCs via more terminals than CCK/CB1BCs, similar numbers (15–17) of the two BC types converge onto single PCs, whereas fewer (6–7) AACs innervate the axon initial segment of single PCs. Furthermore, we estimated that a PVBC and a CCK/CB1BC may target 800–900 and 700–800 PCs, respectively, while an AAC can innervate 600–650 PCs. Thus, BCs and AACs innervate ~10 and 20% of PC population, respectively, within their axonal cloud. Our results collectively suggest, that these interneuron types may be differently affiliated within the local amygdalar microcircuits in order to fulfill specific functions in network operation during various brain states.
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Affiliation(s)
- Viktória K Vereczki
- Lendület' Laboratory of Network Neurophysiology, Institute of Experimental Medicine, Hungarian Academy of SciencesBudapest, Hungary; Department of Anatomy, Histology and Embryology, Faculty of Medicine, Semmelweis UniversityBudapest, Hungary
| | - Judit M Veres
- Lendület' Laboratory of Network Neurophysiology, Institute of Experimental Medicine, Hungarian Academy of SciencesBudapest, Hungary; János Szentágothai School of Neurosciences, Semmelweis UniversityBudapest, Hungary
| | - Kinga Müller
- Lendület' Laboratory of Network Neurophysiology, Institute of Experimental Medicine, Hungarian Academy of Sciences Budapest, Hungary
| | - Gergö A Nagy
- Lendület' Laboratory of Network Neurophysiology, Institute of Experimental Medicine, Hungarian Academy of Sciences Budapest, Hungary
| | - Bence Rácz
- Department of Anatomy and Histology, Szent István UniversityBudapest, Hungary; Electronmicroscopy Research Group, Faculty of Veterinary Science, Szent István UniversityBudapest, Hungary
| | - Boglárka Barsy
- Lendület' Laboratory of Network Neurophysiology, Institute of Experimental Medicine, Hungarian Academy of Sciences Budapest, Hungary
| | - Norbert Hájos
- Lendület' Laboratory of Network Neurophysiology, Institute of Experimental Medicine, Hungarian Academy of Sciences Budapest, Hungary
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19
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Abstract
Consumption of high-energy diets may compromise health and may also impair cognition; these impairments have been linked to tasks that require hippocampal function. Conversely, food restriction has been shown to improve certain aspects of hippocampal function, including spatial memory and memory persistence. These diet-dependent functional changes raise the possibility that the synaptic structure underlying hippocampal function is also affected. To examine how short-term food restriction (FR) alters the synaptic structure of the hippocampus, we used quantitative electron microscopy to analyze the organization of neuropil in the CA1 stratum radiatum of the hippocampus in young rats, consequent to reduced food. While four weeks of FR did not modify the density, size, or shape of postsynaptic spines, the synapses established by these spines were altered, displaying increased mean length, and more frequent perforations of postsynaptic densities. That the number of perforated synapses (believed to be an indicator of synaptic enhancement) increased, and that the CA1 spine population had on average significantly longer PSDs suggests that synaptic efficacy of axospinous synapses also increased in the CA1. Taken together, our ultrastructural data reveal previously unrecognized structural changes at hippocampal synapses as a function of food restriction, supporting a link between metabolic balance and synaptic plasticity.
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Affiliation(s)
- Réka Babits
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, Budapest, H-1078, Hungary
| | - Balázs Szőke
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, Budapest, H-1078, Hungary
| | - Péter Sótonyi
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, Budapest, H-1078, Hungary
| | - Bence Rácz
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, Budapest, H-1078, Hungary
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20
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Bencsik N, Szíber Z, Liliom H, Tárnok K, Borbély S, Gulyás M, Rátkai A, Szűcs A, Hazai-Novák D, Ellwanger K, Rácz B, Pfizenmaier K, Hausser A, Schlett K. Protein kinase D promotes plasticity-induced F-actin stabilization in dendritic spines and regulates memory formation. J Cell Biol 2015; 210:771-83. [PMID: 26304723 PMCID: PMC4555815 DOI: 10.1083/jcb.201501114] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [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: 01/28/2015] [Accepted: 07/23/2015] [Indexed: 02/07/2023] Open
Abstract
PKD regulates the stabilization of the F-actin network within dendritic spines upon chemically induced plasticity changes and is needed for proper hippocampal LTP and spatial memory formation. Actin turnover in dendritic spines influences spine development, morphology, and plasticity, with functional consequences on learning and memory formation. In nonneuronal cells, protein kinase D (PKD) has an important role in stabilizing F-actin via multiple molecular pathways. Using in vitro models of neuronal plasticity, such as glycine-induced chemical long-term potentiation (LTP), known to evoke synaptic plasticity, or long-term depolarization block by KCl, leading to homeostatic morphological changes, we show that actin stabilization needed for the enlargement of dendritic spines is dependent on PKD activity. Consequently, impaired PKD functions attenuate activity-dependent changes in hippocampal dendritic spines, including LTP formation, cause morphological alterations in vivo, and have deleterious consequences on spatial memory formation. We thus provide compelling evidence that PKD controls synaptic plasticity and learning by regulating actin stability in dendritic spines.
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Affiliation(s)
- Norbert Bencsik
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Zsófia Szíber
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Hanna Liliom
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Krisztián Tárnok
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Sándor Borbély
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Márton Gulyás
- MTA-ELTE-NAP B Neuronal Cell Biology Research Group, H-1117 Budapest, Hungary
| | - Anikó Rátkai
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Attila Szűcs
- MTA-ELTE-NAP B Neuronal Cell Biology Research Group, H-1117 Budapest, Hungary
| | - Diána Hazai-Novák
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, H-1400 Budapest, Hungary
| | - Kornelia Ellwanger
- Institute of Cell Biology and Immunology, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Bence Rácz
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, H-1400 Budapest, Hungary
| | - Klaus Pfizenmaier
- Institute of Cell Biology and Immunology, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Angelika Hausser
- Institute of Cell Biology and Immunology, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Katalin Schlett
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary MTA-ELTE-NAP B Neuronal Cell Biology Research Group, H-1117 Budapest, Hungary
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21
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Hazai D, Szudoczki R, Ding J, Soderling SH, Weinberg RJ, Sótonyi P, Rácz B. Ultrastructural abnormalities in CA1 hippocampus caused by deletion of the actin regulator WAVE-1. PLoS One 2013; 8:e75248. [PMID: 24086480 PMCID: PMC3783472 DOI: 10.1371/journal.pone.0075248] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Accepted: 08/12/2013] [Indexed: 11/18/2022] Open
Abstract
By conveying signals from the small GTPase family of proteins to the Arp2/3 complex, proteins of the WAVE family facilitate actin remodeling. The WAVE-1 isoform is expressed at high levels in brain, where it plays a role in normal synaptic processing, and is implicated in hippocampus-dependent memory retention. We used electron microscopy to determine whether synaptic structure is modified in the hippocampus of WAVE-1 knockout mice, focusing on the neuropil of CA1 stratum radiatum. Mice lacking WAVE-1 exhibited alterations in the morphology of both axon terminals and dendritic spines; the relationship between the synaptic partners was also modified. The abnormal synaptic morphology we observed suggests that signaling through WAVE-1 plays a critical role in establishing normal synaptic architecture in the rodent hippocampus.
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Affiliation(s)
- Diána Hazai
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, Budapest, Hungary
| | - Róbert Szudoczki
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, Budapest, Hungary
| | - Jindong Ding
- Department of Ophthalmology, Duke Eye Center, Duke University, Durham, North Carolina, United States of America
| | - Scott H. Soderling
- Departments of Cell Biology and Neurobiology, Duke University, Durham, North Carolina, United States of America
| | - Richard J. Weinberg
- Department of Cell Biology & Physiology and Neuroscience Center, University of North Carolina, Chapel Hill, North Carolina, United States of America
| | - Péter Sótonyi
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, Budapest, Hungary
| | - Bence Rácz
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, Budapest, Hungary
- * E-mail:
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22
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Abstract
Glutamatergic axons in the mammalian forebrain terminate predominantly onto dendritic spines. Long-term changes in the efficacy of these excitatory synapses are tightly coupled to changes in spine morphology. The reorganization of the actin cytoskeleton underlying this spine "morphing" involves numerous proteins that provide the machinery needed for adaptive cytoskeletal remodeling. Here, we review recent literature addressing the chemical architecture of the spine, focusing mainly on actin-binding proteins (ABPs). Accumulating evidence suggests that ABPs are organized into functionally distinct microdomains within the spine cytoplasm. This functional compartmentalization provides a structural basis for regulation of the spinoskeleton, offering a novel window into mechanisms underlying synaptic plasticity.
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Affiliation(s)
- Bence Rácz
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, 1078, Budapest, Hungary.
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23
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Hruškovičová H, Dušková M, Simůnková K, Hill M, Pospíšilová H, Rácz B, Králíková E, Vondra K, Stárka L. Effects of smoking cessation on hormonal levels in men. Physiol Res 2012; 62:67-73. [PMID: 23173678 DOI: 10.33549/physiolres.932326] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Chronic smoking can cause imbalance in endocrine homeostasis and impairment of fertility in both sexes. The male reproductive system is more resilient, still the literature provides conflicting results about the influence of smoking on the steroid hormone levels. The data about smoking cessation are limited; there has not yet been a study primarily focused on changes in steroids levels. In our study, we analyzed levels of testosterone, dehydroepiandrosterone (DHEA), dehydroepiandrosterone sulphate (DHEAS), cortisol and sex hormone-binding globulin (SHBG) in male smokers and during smoking cessation. Monitored analytes were determined by RIA. The free testosterone index was calculated. Basal samples of men successful and unsuccessful in smoking cessation did not differ and monitored hormones could hardly predict success of smoking cessation. After one year without smoking, a significant BMI increase and SHBG decrease in former smokers was observed. The decrease in total testosterone was non-significant. Changes in SHBG and testosterone did not correlate with BMI, presumably due to the direct effect of smoking cessation.
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24
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Ferencz A, Nedvig K, Fekecs T, Rácz B, Wéber G, Hashimoto H, Baba A, Helyes Z, Reglödi D. Comparison of intestinal cold preservation injury on pituitary adenylate cyclase-activating polypeptide in knockout and wild-type mice. Transplant Proc 2011; 42:2290-2. [PMID: 20692465 DOI: 10.1016/j.transproceed.2010.05.014] [Citation(s) in RCA: 5] [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: 10/19/2022]
Abstract
Tissue injury caused by cold preservation remains a problem in small intestinal transplantation. Pituitary adenylate cyclase-activating polypeptide (PACAP) has a central role in intestinal physiology. The objective of the present study was to compare the effects of cold ischemia injury in PACAP-38 knockout and wild-type mice after cold storage of small bowel. Cold ischemia was produced using small bowel preservation in University of Wisconsin solution at 4 degrees C in 20 PACAP-38 wild-type mice for 1, 3, and 6 hours (groups 1, 2, and 3, respectively) and 20 PACAP-38 knockout mice for 1, 3, and 6 hours (groups 4, 5, and 6, respectively). Biopsy samples of small bowel were obtained after laparotomy (control) and at the end of preservation periods. To determine oxidative stress, malondialdehyde, reduced glutathione, and superoxide dismutase concentrations were measured. Tissue damage was assessed using a quantitative method on sections stained with hematoxylin-eosin. After 6 hours, tissue lipid peroxidation was increased significantly in PACAP-38 knockout mice (mean +/- SD, 153.04 +/- 7.2 micromol/g) compared with sham-operated mice (110.44 +/- 5.5 micromol/g) and wild-type mice (120.0 +/- 1.1 micromol/g) (P < .05). The capacity and activity of the endogenous antioxidant system decreased significantly after 3 and 6 hours of preservation (reduced glutathione, 808.7 +/- 5.2 micromol/g and 720.4 +/- 8.7 micromol/g; and superoxide dismutase, 125.1 +/- 1.4 IU/g and 103.3 +/- 1.9 IU/g vs 212.11 +/- 5.8 IU/g; P < .05). Quantitative histologic analysis demonstrated destruction of mucosal and submucosal layers and crypts in knockout mice compared with wild-type mice. These processes depended on duration of cold preservation. These findings demonstrate that PACAP-38 has a key role in protection against intestinal cold preservation injury.
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Affiliation(s)
- A Ferencz
- Department of Surgical Research and Techniques, University of Pécs Medical School, Pécs, Hungary.
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25
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Roth E, Wéber G, Kiss P, Horváth G, Tóth G, Gasz B, Ferencz A, Gallyas F, Reglodi D, Rácz B. Effects of PACAP and preconditioning against ischemia/reperfusion-induced cardiomyocyte apoptosis in vitro. Ann N Y Acad Sci 2009; 1163:512-6. [PMID: 19456402 DOI: 10.1111/j.1749-6632.2008.03635.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The neuropeptide pituitary adenylate cyclase activating polypeptide (PACAP) and its receptors are widely expressed in the nervous system and various other tissues. PACAP exerts strong anti-apoptotic effects in neuronal cell lines and, according to recent data, also in non-neuronal cells. The peptide is present in the cardiovascular system and has various distinct effects. We have demonstrated earlier that PACAP has protective effects against in vitro ischemia/reperfusion-induced apoptosis in cardiomyocytes. Preconditioning with brief intermittent periods of ischemia is known to provide protection against ischemic injury. The aim of the present study was to investigate whether PACAP could enhance the protective effect of preconditioning against in vitro ischemic injury. Cultured cardiomyocytes were exposed to brief preconditioning ischemia followed by 2 h ischemia and 4 h reperfusion. Both PACAP treatment and preconditioning alone significantly increased cell viability and decreased the ratio of cell death. Pretreatment with PACAP was found to further reduce the level of cleaved caspase-8 but it did not lead to additional survival rate when compared to cells treated with PACAP or preconditioning alone. These results show that although both PACAP and preconditioning have a protective effect against ischemia/reperfusion-induced cardiomyocyte apoptosis, their effects are not additive.
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Affiliation(s)
- E Roth
- Department of Surgical Research and Techniques, University of Pécs, Pécs, Hungary
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26
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Ferencz A, Reglo di D, Kalmár-Nagy K, Horváth OP, Ro Th E, Wéber G, Rácz B. Influence of pituitary adenylate cyclase-activating polypeptide on the activation of mitogen activated protein kinases following small bowel cold preservation. Transplant Proc 2009; 41:60-2. [PMID: 19249476 DOI: 10.1016/j.transproceed.2008.08.149] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2008] [Accepted: 08/06/2008] [Indexed: 10/21/2022]
Abstract
Cold preservation prior to small bowel transplantation can moderate tissue oxidative injury. This stress triggers several intracellular pathways via mitogen activated protein (MAP) kinases. MAP kinases include the extracellular signal related kinase (ERK), c-Jun N-terminal kinase (JNK), and p38 MAP kinase. Pituitary adenylate cyclase-activating polypeptide (PACAP) plays a central role in intestinal physiology. We sought to investigate the effect of PACAP on the activation of MAP kinases during cold preservation of the small bowel. Total orthotopic intestinal autotransplantation was performed on 40 Wistar rats. Perfused grafts were stored in University of Wisconsin (UW) solution for 1 (GI), 2 (GII), 3 (GIII), or 6 hours (GIV) without or with 30 PACAP, namely 1 (GV), 2 (GVI), 3 (GVII), or 6 hours (GVIII). After 3 hours of reperfusion in all groups, the activation of MAP kinases were measured using immunocytochemistry of small bowel tissue. Among the UW preserved grafts (GI-GIV), phosphorylated ERK1/2 level were decreased, while phosphorylated JNK1/2 and p38 MAP kinase activation were elevated compared with control levels. In GV-GVIII PACAP we observed enhanced phospho-ERK1/2 appearance with decreased JNK and p38 MAP kinase activity at the end of the reperfusion periods. We concluded that cold preservation decreased phosphorylated ERK1/2 levels and increased JNK1/2 and p38 MAP kinase activities, which meant that cold storage triggered apoptotic cell death. In contrast, PACAP treatment induced signalling pathways protective against oxidative injury by MAP kinases in bowel tissue.
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Affiliation(s)
- A Ferencz
- Department of Surgical Research and Techniques, University of Pécs, Medical School, Pécs, Hungary.
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27
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Ferencz A, Rácz B, Tamás A, Nedvig K, Németh J, Kalmár-Nagy K, Horváth OP, Wéber G, Röth E, Reglödi D. Changes and effect of PACAP-38 on intestinal ischemia-reperfusion and autotransplantation. Transplant Proc 2009; 41:57-9. [PMID: 19249475 DOI: 10.1016/j.transproceed.2008.10.084] [Citation(s) in RCA: 13] [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: 07/11/2008] [Revised: 09/01/2008] [Accepted: 10/02/2008] [Indexed: 11/18/2022]
Abstract
Tissue injury caused by cold preservation and reperfusion during small bowel transplantation remains an unsolved problem. Increasing evidence suggests that pituitary adenylate cyclase-activating polypeptide (PACAP) has protective effects in several ischemia-reperfusion (I/R) models. This study investigated the effect of PACAP-38 on oxidative stress in autotransplanted intestine. We established sham-operated, I/R, and autotransplanted groups in Wistar rats (n = 55). We applied ischemia for 1 (GI), 2 (GII), or 3 hours (GIII). In autotransplanted groups, we performed total orthotopic intestinal autotransplantation. Grafts were preserved in University of Wisconsin (UW) solution for 1 (GIV), 2 (GV), 3 (GVI), or 6 (GVII) hours and in PACAP-38-containing UW for 1 (GVIII), 2 (GIX), 3 (GX), or 6 (GXI) hours. Reperfusion lasted 3 hours in each group. Endogenous PACAP-38 values were measured by radioimmunoassay. Oxidative stress parameters malondialdehyde (MDA), reduced glutathione (GSH), and superoxide dismutase (SOD) were measured in tissue homogenates. Concentration of endogenous PACAP-38 significantly decreased in GI to GIII compared with the sham-operated animals following I/R periods (P < .05). Cold preservation in UW and reperfusion of the intestine increased the level of tissue MDA in GIV to GVII, which correlated with the duration of cold storage. The content of GSH decreased in GIV to GVII to levels that were significantly different between GIV and GVIII and between GVII and GXI. SOD activity decreased dramatically in GIV to GVII with significantly higher activity in GIX to GXI. Our findings confirmed that I/R decreased endogenous PACAP-38 concentration. Administration of PACAP-38 to UW solution mitigated the oxidative injury during intestinal autotransplantation.
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Affiliation(s)
- A Ferencz
- Department of Surgical Research and Techniques, University of Pécs, Pécs, Hungary.
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Stárka L, Dušková M, Rácz B, Šimůnková K, Hill M, Kancheva R. Melatonin Negatively Correlates with C-Peptide after Food Intake. Physiol Res 2008; 57 Suppl 1:S187-S192. [DOI: 10.33549/physiolres.931504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Melatonin plays a key role in the circadian timing system. At present, many other functions of melatonin are known. Question remains whether changes in endogenous melatonin may be associated with food intake. Hence, the levels of melatonin, C-peptide and glucose were followed during a daily regimen (16 hours) including standardized food intake using commercial kits. The diurnal profiles of the hormones and serum glucose were evaluated using ANOVA with Period and Subject as independent factors. Pearson's correlations and using a multiple stepwise backward regression model consisting of the time factor as a polynomial, and serum C-peptide and glucose assessed the correlations between melatonin and the remaining parameters. Our results showed a significant negative correlation between melatonin and C-peptide. The profile of melatonin was physiological, decreasing after wake-up, showing minor changes during the daytime and increasing in the evening. As documented, lesser alterations were indicated in the course of the melatonin daytime profile, which may reflect periodic food intake. Food intake is not the primary factor influencing the melatonin course. While previous studies have mostly considered the protective effect of melatonin in diabetic subjects, our study brought the results suggesting food intake as a factor contributing to daytime melatonin variation in humans. However, the physiological role of melatonin association with food intake in daytime remains in question and should be further investigated.
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Lu J, Helton TD, Blanpied TA, Rácz B, Newpher TM, Weinberg RJ, Ehlers MD. Postsynaptic positioning of endocytic zones and AMPA receptor cycling by physical coupling of dynamin-3 to Homer. Neuron 2007; 55:874-89. [PMID: 17880892 PMCID: PMC2597538 DOI: 10.1016/j.neuron.2007.06.041] [Citation(s) in RCA: 212] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2006] [Revised: 06/08/2007] [Accepted: 07/31/2007] [Indexed: 02/07/2023]
Abstract
Endocytosis of AMPA receptors and other postsynaptic cargo occurs at endocytic zones (EZs), stably positioned sites of clathrin adjacent to the postsynaptic density (PSD). The tight localization of postsynaptic endocytosis is thought to control spine composition and regulate synaptic transmission. However, the mechanisms that situate the EZ near the PSD and the role of spine endocytosis in synaptic transmission are unknown. Here, we report that a physical link between dynamin-3 and the postsynaptic adaptor Homer positions the EZ near the PSD. Disruption of dynamin-3 or its interaction with Homer uncouples the PSD from the EZ, resulting in synapses lacking postsynaptic clathrin. Loss of the EZ leads to a loss of synaptic AMPA receptors and reduced excitatory synaptic transmission that corresponds with impaired synaptic recycling. Thus, a physical link between the PSD and the EZ ensures localized endocytosis and recycling by recapturing and maintaining a proximate pool of cycling AMPA receptors.
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Affiliation(s)
- Jiuyi Lu
- Department of Neurobiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Thomas D. Helton
- Department of Neurobiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Thomas A. Blanpied
- Department of Neurobiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Bence Rácz
- Department of Cell and Developmental Biology, University of North Carolina School of Medicine, Chapel Hill, NC, 27599, USA
| | - Thomas M. Newpher
- Department of Neurobiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Richard J. Weinberg
- Department of Cell and Developmental Biology, University of North Carolina School of Medicine, Chapel Hill, NC, 27599, USA
- Neuroscience Center, University of North Carolina School of Medicine, Chapel Hill, NC, 27599, USA
| | - Michael D. Ehlers
- Howard Hughes Medical Institute, Duke University Medical Center, Durham, NC 27710, USA
- Department of Neurobiology, Duke University Medical Center, Durham, NC 27710, USA
- Corresponding Author: Michael D. Ehlers, M.D., Ph.D., Howard Hughes Medical Institute, Department of Neurobiology, Duke University Medical Center, Box 3209, Durham, NC 27710, USA, Tel: (919)684-1828, FAX (919)668-0631, e-mail:
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Rácz B, Gasz B, Gallyas F, Kiss P, Tamás A, Szántó Z, Lubics A, Lengvári I, Tóth G, Hegyi O, Roth E, Reglodi D. PKA-Bad-14-3-3 and Akt-Bad-14-3-3 signaling pathways are involved in the protective effects of PACAP against ischemia/reperfusion-induced cardiomyocyte apoptosis. ACTA ACUST UNITED AC 2007; 145:105-15. [PMID: 17981349 DOI: 10.1016/j.regpep.2007.09.015] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The neuropeptide PACAP (pituitary adenylate cyclase activating polypeptide) and its receptors are widely expressed in the nervous system and various other tissues. PACAP has well-known anti-apoptotic effects in neuronal cell lines. Recent data suggest that PACAP exerts anti-apoptotic effects also in non-neuronal cells. The peptide is present in the cardiovascular system, and has various distinct effects. The aim of the present study was to investigate whether PACAP is protective against in vitro ischemia/reperfusion-induced apoptosis in cardiomyocytes. Cultured cardiomyocytes were exposed to 60 min ischemia followed by 120 min reperfusion. The addition of PACAP1-38 significantly increased cell viability and decreased the ratio of apoptotic cells as measured by MTT test and flow cytometry. PACAP induced the phosphorylation of Akt and protein kinase A. In the present study we also examined the possible involvement of Akt- and protein kinase A-induced phosphorylation and thus inactivation of Bad, a pro-apoptotic member of the Bcl-2 family. It was found that ischemia significantly decreased the levels of phosphorylated Bad, which was counteracted by PACAP. Furthermore, PACAP increased the levels of Bcl-xL and 14-3-3 protein, both of which promote cell survival, and decreased the apoptosis executor caspase-3 cleavage. All effects of PACAP1-38 were inhibited by the PACAP antagonist PACAP6-38. In summary, our results show that PACAP has protective effects against ischemia/reperfusion-induced cardiomyocyte apoptosis and provides new insights into the signaling mechanisms involved in the PACAP-mediated anti-apoptotic effects.
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Affiliation(s)
- B Rácz
- Department of Surgical Research and Techniques, University of Pecs, Hungary
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Kiss P, Hauser D, Tamás A, Lubics A, Rácz B, Horvath ZS, Farkas J, Zimmermann F, Stepien A, Lengvari I, Reglódi D. Changes in open-field activity and novelty-seeking behavior in periadolescent rats neonatally treated with monosodium glutamate. Neurotox Res 2007; 12:85-93. [PMID: 17967732 DOI: 10.1007/bf03033917] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Monosodium glutamate (MSG) treatment of neonatal rodents leads to degeneration of the neurons in the arcuate nucleus, inner retinal layers and various other brain areas. It also causes various changes in the motor activity, sensory performance and learning abilities. We have previously shown that MSG treatment delays the appearance of some reflexes during neurobehavioral development and leads to temporary changes in reflex performance and motor coordination. Investigation of novelty-seeking behavior is of growing importance for its relationship with sensitivity to psychomotor stimulants. Perinatal administration of numerous toxic agents has been shown to influence novelty-seeking behavior in rats, but little is known about the influence of neonatal MSG treatment on the novelty-seeking behavior. The aim of the present study was to compare changes in locomotor, spontaneous exploratory and novelty-seeking behavior in periadolescent rats neonatally treated with MSG. Newborn rats were treated with 4 mg/g MSG subcutaneously on postnatal days 1, 3, 5, 7 and 9. Open-field behavior was tested at 2, 3, 4, 6 and 8 weeks of age. We found that MSG administration led to only temporary increases in locomotor behavior, which was more pronounced during the first few postnatal weeks, followed by a subtle hypoactivity at 2 months of age. Novelty-seeking was tested in four 5-min trials at 3 weeks of age. Trial 1 was in an empty open-field, two identical objects were placed in the arena during trial 2 and 3, and one of them was replaced to a novel object during trial 4. We found that the behavioral pattern of MSG-treated rats was the opposite in all tested signs in the novelty exploration test compared to control pups. In summary, our present study shows that neonatal MSG treatment leads to early temporary changes in the locomotor activity followed by hypoactivity at 2 months of age. Furthermore, MSG-treated rats show a markedly disturbed novelty-seeking behavior represented by altered activity when subjected to a novel object.
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Affiliation(s)
- P Kiss
- Department of Anatomy, University of Pecs, Medical Faculty, Hungary
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Rácz B, Gasz B, Borsiczky B, Gallyas F, Tamás A, Józsa R, Lubics A, Kiss P, Roth E, Ferencz A, Tóth G, Hegyi O, Wittmann I, Lengvári I, Somogyvári-Vigh A, Reglodi D. Protective effects of pituitary adenylate cyclase activating polypeptide in endothelial cells against oxidative stress-induced apoptosis. Gen Comp Endocrinol 2007; 153:115-23. [PMID: 17270184 DOI: 10.1016/j.ygcen.2006.12.006] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [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: 09/15/2006] [Revised: 11/15/2006] [Accepted: 12/18/2006] [Indexed: 11/16/2022]
Abstract
Pituitary adenylate cyclase activating polypeptide (PACAP) is a widely distributed neuropeptide that has various different functions in the nervous system and in non-neural tissues. Little is known about the effects of PACAP in endothelial cells. The aim of the present study was to investigate the effects of PACAP on endothelial cell survival and apoptotic signaling pathways under oxidative stress. Mouse hemangioendothelioma (EOMA) cells were exposed to 0.5mM H(2)O(2) which resulted in a marked reduction of cell viability and a parallel increase of apoptotic cells assessed by MTT test and flow cytometry. Co-incubation with 20nM PACAP1-38 increased cell viability and reduced the percentage of apoptotic cells. Flow cytometry analysis showed that oxidative stress reduced the phosphorylation of the anti-apoptotic ERK and increased the phosphorylation of the pro-apoptotic JNK and p38 MAP kinases. PACAP1-38 treatment ameliorated these changes: levels of phospho-ERK were elevated and those of phospho-JNK and p38 were decreased. All these effects were abolished by simultaneous treatment with the PACAP antagonist PACAP6-38. In summary, our results show that PACAP effectively protects endothelial cells against the apoptosis-inducing effects of oxidative stress.
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Affiliation(s)
- B Rácz
- Department of Surgical Research and Techniques, University of Pécs, Pécs, Hungary
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Kovács EG, Szalay F, Rácz B, Halasy K. Chronic fasting-induced changes of neuropeptide Y immunoreactivity in the lateral septum of intact and ovariectomized female rats. Brain Res 2007; 1153:103-10. [PMID: 17466286 DOI: 10.1016/j.brainres.2007.03.064] [Citation(s) in RCA: 4] [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] [Received: 12/20/2006] [Revised: 03/13/2007] [Accepted: 03/23/2007] [Indexed: 12/29/2022]
Abstract
The effect of 40% food deprivation for 1 week on the immunohistochemically detectable amount of neuropeptide Y (NPY) was studied in the lateral septum (LS) of intact and ovariectomized (OVX) female rats. Animals were either fed ad libitum or 40% food-deprived. Densitometric analysis of immunostained material showed a significant decrease in NPY-immunoreactivity (NPY-IR) in OVX rats compared to the control group. Food deprivation increased the density of punctate NPY-IR profiles in both intact and OVX animals, however, the density in food-deprived OVX animals was increased compared to baseline but remained reduced compared to intact rats. Our study indicates that the lack of gonadal hormones - most likely estrogen - results in a decrease in the density of NPY-IR axonal fibers within the LS, while food deprivation induced considerable elevation in NPY density. Food restriction-induced changes in the density of NPY-containing neural elements suggest that the LS may play a crucial role in the regulation of food intake and energy balance, in concert with the relevant hypothalamic areas.
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Affiliation(s)
- Eva G Kovács
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, Budapest, Hungary.
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Gasz B, Bertok S, Rácz B, Sumegi B, Papp L, Röth E, Alotti N. Activation of PARP enzyme and phosphorialion of protein kianse B (Akt) during and following cardiopulmonary bypass. Thorac Cardiovasc Surg 2007. [DOI: 10.1055/s-2007-967679] [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: 10/21/2022]
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Abstract
Ischemic preconditioning (IPC), which is obtained by exposure to brief periods of vascular occlusion, improves organ tolerance to prolonged ischemia. The aim of this study was to evaluate the threshold level of NF-kB activation in small intestine during an IPC procedure. Various intestinal IPC were performed on 20 Wistar rats in seven groups: group I (GI, nonpreconditioned); group II (GII, 1-minute ischemia and 1-minute reperfusion); group III (GIII, two cycles of 1-minute ischemia and 1-minute reperfusion); group IV (GIV, 2-minutes ischemia and 2-minutes reperfusion); group V (GV, two cycles of 2-minute ischemia and 2-minute reperfusion); group VI (GVI, 5-minute ischemia and 10-minute reperfusion); group VII (GVII, two cycles of 5-minute ischemia and 10-minute reperfusion). Bowel biopsies were collected after laparotomy (control) as well as at 30, 60, and 120 minutes following IPC. We determined the cytoplasmic and nuclear NF-kB by a chemiluminescence-based ELISA method. Our results showed low, constant NF-kB levels in GI. In the preconditioned groups (GII-GVII), NF-kB was significantly elevated at 30 minutes following IPC (P < .05 vs control). After 1 hour, NF-kB activity decreased to the control level. However, 2 hours after IPC both forms of NF-kB were elevated significantly again, which was independent of the number of IPC cycles (P < .05 vs control). Our experiments revealed that one cycle of 1-minute ischemia and 1-minute reperfusion is a critical threshold level for NF-kB activation during small bowel IPC. Longer and more IPC cycles did not result in further elevation of NF-kB activation.
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Affiliation(s)
- A Ferencz
- Department of Surgical Research and Techniques, University of Pécs Medical School, Kodály Zoltán Street 20, Pécs, H-7624 Hungary.
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Dezsö Z, Almaas E, Lukács A, Rácz B, Szakadát I, Barabási AL. Dynamics of information access on the web. Phys Rev E Stat Nonlin Soft Matter Phys 2006; 73:066132. [PMID: 16906939 DOI: 10.1103/physreve.73.066132] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2005] [Revised: 03/29/2006] [Indexed: 05/11/2023]
Abstract
While current studies on complex networks focus on systems that change relatively slowly in time, the structure of the most visited regions of the web is altered at the time scale from hours to days. Here we investigate the dynamics of visitation of a major news portal, representing the prototype for such a rapidly evolving network. The nodes of the network can be classified into stable nodes, which form the time-independent skeleton of the portal, and news documents. The visitations of the two node classes are markedly different, the skeleton acquiring visits at a constant rate, while a news document's visitation peaks after a few hours. We find that the visitation pattern of a news document decays as a power law, in contrast with the exponential prediction provided by simple models of site visitation. This is rooted in the inhomogeneous nature of the browsing pattern characterizing individual users: the time interval between consecutive visits by the same user to the site follows a power-law distribution, in contrast to the exponential expected for Poisson processes. We show that the exponent characterizing the individual user's browsing patterns determines the power-law decay in a document's visitation. Finally, our results document the fleeting quality of news and events: while fifteen minutes of fame is still an exaggeration in the online media, we find that access to most news items significantly decays after 36 hours of posting.
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Affiliation(s)
- Z Dezsö
- Center for Complex Network Research and Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
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Cserepes B, Jancsó G, Rácz B, Gasz B, Ferencz A, Benkö L, Borsiczky B, Füredi R, Ferencz S, Kürthy M, Gaszner B, Lantos J, Röth E. Cell protective role of urocortin in myocardial pre- and postconditioning. J Mol Cell Cardiol 2006. [DOI: 10.1016/j.yjmcc.2006.03.124] [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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Horton AC, Rácz B, Monson EE, Lin AL, Weinberg RJ, Ehlers MD. Polarized secretory trafficking directs cargo for asymmetric dendrite growth and morphogenesis. Neuron 2006; 48:757-71. [PMID: 16337914 DOI: 10.1016/j.neuron.2005.11.005] [Citation(s) in RCA: 334] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2005] [Revised: 08/08/2005] [Accepted: 11/04/2005] [Indexed: 12/27/2022]
Abstract
Proper growth of dendrites is critical to the formation of neuronal circuits, but the cellular machinery that directs the addition of membrane components to generate dendritic architecture remains obscure. Here, we demonstrate that post-Golgi membrane trafficking is polarized toward longer dendrites of hippocampal pyramidal neurons in vitro and toward apical dendrites in vivo. Small Golgi outposts partition selectively into longer dendrites and are excluded from axons. In dendrites, Golgi outposts concentrate at branchpoints where they engage in post-Golgi trafficking. Within the cell body, the Golgi apparatus orients toward the longest dendrite, and this Golgi polarity precedes asymmetric dendrite growth. Manipulations that selectively block post-Golgi trafficking halt dendrite growth in developing neurons and cause a shrinkage of dendrites in mature pyramidal neurons. Further, disruption of Golgi polarity produces neurons with symmetric dendritic arbors lacking a single longest principal dendrite. These results define a novel polarized organization of neuronal secretory trafficking and demonstrate a mechanistic link between directed membrane trafficking and asymmetric dendrite growth.
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Affiliation(s)
- April C Horton
- Department of Neurobiology, Duke University Medical Center, Durham, North Carolina 27710, USA
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Gasz B, Rácz B, Roth E, Borsiczky B, Ferencz A, Tamás A, Cserepes B, Lubics A, Gallyas F, Tóth G, Lengvári I, Reglodi D. Pituitary adenylate cyclase activating polypeptide protects cardiomyocytes against oxidative stress-induced apoptosis. Peptides 2006; 27:87-94. [PMID: 16095757 DOI: 10.1016/j.peptides.2005.06.022] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [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: 06/10/2005] [Revised: 06/27/2005] [Accepted: 06/30/2005] [Indexed: 11/17/2022]
Abstract
Pituitary adenylate cyclase activating polypeptide (PACAP) has well-known neuroprotective effects, and one of the main factors leading to neuroprotection seems to be its anti-apoptotic effects. The peptide and its receptors are present also in the heart, but whether PACAP can be protective in cardiomyocytes, is not known. Therefore, the aim of the present study was to investigate the effects of PACAP on oxidative stress-induced apoptosis in cardiomyocytes. Our results show that PACAP increased cell viability by attenuating H2O2-induced apoptosis in a cardiac myocyte culture. PACAP also decreased caspase-3 activity and increased the expression of the anti-apoptotic markers Bcl-2 and phospho-Bad. These effects of PACAP were counteracted by the PACAP antagonist PACAP6-38. In summary, our results show that PACAP is able to attenuate oxidative stress-induced cardiomyocyte apoptosis.
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Affiliation(s)
- B Gasz
- Department of Surgical Research and Techniques, Medical Faculty, Pécs University, Hungary
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Rácz B, Blanpied TA, Ehlers MD, Weinberg RJ. Lateral organization of endocytic machinery in dendritic spines. Nat Neurosci 2004; 7:917-8. [PMID: 15322548 DOI: 10.1038/nn1303] [Citation(s) in RCA: 158] [Impact Index Per Article: 7.9] [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: 07/09/2004] [Accepted: 07/29/2004] [Indexed: 02/05/2023]
Abstract
Postsynaptic membrane trafficking plays an important role in synaptic plasticity, but the organization of trafficking machinery within dendritic spines is poorly understood. We use immunocytochemical analysis of rat hippocampal neurons to show that proteins mediating endocytosis are systematically arrayed within dendritic spines, tangential to the synapse. Thus, previously unrecognized lateral domains of the spine organize endocytic protein machinery at sites removed from the postsynaptic density.
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Affiliation(s)
- Bence Rácz
- Department of Cell & Developmental Biology, University of North Carolina, Chapel Hill, North Carolina 27599, USA
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Rácz B, Halasy K. Kappa-opioid receptor in the rodent hippocampus: a comparative immunocytochemical study in the rat, guinea pig, hamster and gerbil. Acta Biol Hung 2003; 54:45-53. [PMID: 12705321 DOI: 10.1556/abiol.54.2003.1.5] [Citation(s) in RCA: 4] [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
Pre-embedding light microscopic immunocytochemistry, using a monoclonal antibody (mAb-KA8) raised against a frog brain kappa receptor preparation, recognising selectively the kappa-opioid receptor, was used for studying the occurrence, distribution, and species-specificity of the kappa-opioid receptor in the hippocampal formation of four rodent species (rat, guinea pig, hamster and gerbil). MAb-KA8 immunoreactivity was detectable in the rat, hamster and gerbil hippocampus, however the distribution of the labelled structures was heterogeneous. In the rat and hamster the hilus of dentate gyrus and the stratum oriens of the CA1 area contained immunoreactive cell bodies and proximal dendrites. In the gerbil mAb-KA8 immunopositive cell bodies were recognisable in the stratum radiatum of the CA1 and CA3 areas and in the subiculum. In the hamster varicose axon-like elements were also detected in the CA3 pyramidal layer. With the mAb-KA8 antibody there was no detectable kappa opioid receptor labelling in the hippocampus of the guinea pig. The results confirm the high degree of species-specific heterogeneity characterising the distribution of opioid peptides and their receptors in the hippocampal formation. The receptor was found in most cases postsynaptically, however in the hamster the immunopositive axons may refer to a presynaptic localisation.
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Affiliation(s)
- B Rácz
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, István u. 2, H-1078 Budapest, Hungary.
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Abstract
In our previous studies (J. Chem. Neuroanat. 2000;19:233-241), kappa opioid receptors were immunocytochemically identified in inhibitory interneurons of the dentate hilus and CA1 area of the rat hippocampus. From among the known interneuron subtypes, somatostatin- (SOM) and neuropeptide Y- (NPY) immunoreactive (IR) hippocampal interneurons show morphology and distribution similar to the kappa opioid receptor (KOR) immunopositive cells. In the present study, with the help of double immunocytochemical labelling, we provide direct evidence that the majority of the interneurons immunoreactive for SOM and/or NPY also express the kappa opioid receptor. The receptor was localized on the perikaryal and proximal dendritic region of the SOM- and NPY-immunopositive neurons in the dentate hilus and the CA1 region. From among the SOM-immunoreactive cells, 77% in the dentate hilus and 51% in the CA1 stratum oriens was double labelled. In the case of NPY-immunoreactive neurons this proportion was 56 and 65%, respectively. The co-expression of KOR and SOM/NPY suggests that hippocampal interneurons can selectively be activated by the different opioids under different physiological circumstances.
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Affiliation(s)
- Bence Rácz
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, István u. 2, H-1078, Budapest, Hungary.
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Halasy K, Rácz B, Maderspach K. Kappa opioid receptors are expressed by interneurons in the CA1 area of the rat hippocampus: a correlated light and electron microscopic immunocytochemical study. J Chem Neuroanat 2000; 19:233-41. [PMID: 11036240 DOI: 10.1016/s0891-0618(00)00068-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
A local GABA-system is known to have a mediatory function between several afferents and the principal cells of the hippocampus. This study examines the distribution and fine structure of kappa opioid receptor-immunoreactive elements in the CA1 subfield and reveals some new aspects concerning the structural basis of opioid-GABA interaction in the rat hippocampal formation. Kappa receptors were visualized immunocytochemically with a previously produced and characterized monoclonal antibody, the mAb KA8 (Maderspach, K., Németh, K., Simon, J., Benyhe, S., Szûcs, M., Wollemann, M., 1991. A monoclonal antibody recognizing kappa-, but not mu- and delta-opioid receptors. J. Neurochem. 56, 1897-1904). The antibody selectively recognizes the kappa opioid receptor with preference to the kappa(2) subtype. Neuronal cell bodies, proximal dendrites and occasionally glial processes surrounding neuronal perikarya were labelled in the CA1 area. The immunopositive cells were present mainly in the stratum oriens, followed by the stratum pyramidale in a rostrocaudally increasing number. Their shape was fusiform, or multipolar. Occasionally kappa receptor-immunoreactive boutons surrounding weakly immunopositive somata were also observed. Electron microscopy of immunopositive neurons showed that the DAB labelling was intensive in the perinuclear cytoplasm. The widths and electron densities of the postsynaptic densities of some axosomatic synapses were remarkably increased. Similar increase of postsynaptic densities were observable at some axodendritic and axospinous synapses. On the basis of their location and fine structural properties the labelled cells are suggested to be GABAergic inhibitory interneurons, probably belonging to the somatostatinergic sub-population. The axons of these inhibitory interneurons are known to arborize in the stratum lacunosum-moleculare where the entorhinal afferents terminate. A modulatory effect of opioids on the entorhinal input, mediated by somatostatinergic interneurons is suggested
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Affiliation(s)
- K Halasy
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, István u.2., 1078, Budapest, Hungary.
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Köhalmi T, Gorzó I, Rácz B, Mari A, Boda K, Mihalik E. [Marginal adaptation of different esthetic filling materials under the effect of heat treatment]. Fogorv Sz 1999; 92:301-5. [PMID: 10575817] [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: 04/14/2023]
Abstract
The aim of the study was to examine the marginal adaptation of six tooth coloured restoratives to the tooth hard tissues before and after heat treatment considering the filling method and the placement of the cavity margin. The study showed that 1) the composite marginal adaptation was better with enamel bonding technique than with total bonding technique; 2) the microleakage was less before heat treatment; 3) the best fit was at the occlusal surface and the worst at the gingival tooth-filling junction with the composites; 4) non-composites showed the best adaptation at the approximal enamel-filling junction and the worst at the occlusal surface; 5) the best marginal adaptation could be achieved with Charisma and SpectrumTPH among the composites, and Dyract among the non-composites.
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Affiliation(s)
- T Köhalmi
- Szent-Györgyi Albert Orvostudományi Egyetem Fogászati és Szájsebészeti Klinika, Szeged
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Rácz B, Füzesi M, Halasy K. The hippocampal opioidergic system: a comparative immunocytochemical study in four rodents. Neurobiology (Bp) 1999; 6:429-41. [PMID: 10220778] [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: 02/12/2023]
Abstract
The occurrence and distribution of four opioid peptides (methionine-enkephalin /met-enk/, leucine-enkephalin /leu-enk/, dynorphin-A /dyn-A/, dynorphin-B /dyn-B/) were studied and compared in the subregions and layers of the hippocampi of four rodent species (rat, mouse, hamster and guinea-pig) by means of pre-embedding immunocytochemistry in order to reveal species-specific morphological characteristics. Concerning the mossy fibre system, in the rat met-enk and dyn-A, in the mouse met-enk, in the the hamster dyn-A, in the guinea-pig dyn-B was found to be the dominating immunocytochemically detectable hippocampal opioid peptide. Outside the mossy fibre system, in other hippocampal areas met-enk-immunopositive varicose nerve fibres were most frequently detected in the rat and mouse, whereas dyn-B was the most abundant in the guinea-pig. In the hamster hippocampus all the four studied opioid peptides occurred at least in few varicose fibres. In the rat and mouse enkephalinergic boutons formed pericellular baskets around non-principal cells, whereas dynorphin-immunopositive boutons were visualized in similar arrangement around principal cells (both granule and pyramidal cells) in three of the studied species, except the rat. Among other species-specific differences, the presence of leu-enk-immunopositive perikarya in the golden hamster hippocampus, and a highly ordered leu-enk-immunoreactive fibre system exclusively detected in the CA1 area of the guinea-pig hippocampus are noteworthy. The results confirm the high degree of species-specific heterogeneity characterizing the distribution of the opioid peptides in the hippocampal formation.
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Affiliation(s)
- B Rácz
- Department of Anatomy and Histology, University of Veterinary Science, Budapest, Hungary
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Abstract
Using correlated light and electron microscopic preembedding enkephalin immunocytochemistry combined with post-embedding GABA immunogold staining, we found morphological evidence of a direct connection between the enkephalinergic and GABAergic systems in the rat hippocampus. Enkephalin-immunoreactive boutons were found to be presynaptic to GABA-immunoreactive postsynaptic profiles, establishing type 2 symmetrical synapses on GABA-positive cell bodies and dendritic shafts in strata radiatum and lacunosum moleculare of the CA1 region. Thirty-six percent of all studied postsynaptic targets (n = 40) were non-pyramidal, including all somatic (n = 7) and 47% of the dendritic (n = 13) postsynaptic targets. The remaining 64% consisted of pyramidal dendritic shafts and spines. These results support previous physiological experiments suggesting that the opioidergic system takes part in disinhibitory processes in the hippocampal formation.
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Affiliation(s)
- M Füzesi
- Department of Anatomy and Histology, University of Veterinary Science, Budapest, Hungary
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Bor Z, Hopp B, Rácz B, Szabó G, Ratkay I, Süveges I, Füst A, Mohay J. Plume emission, shock wave and surface wave formation during excimer laser ablation of the cornea. Refract Corneal Surg 1993; 9:S111-5. [PMID: 8499358] [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: 01/31/2023]
Abstract
Excimer lasers are now used for corneal surgery; however, the physical processes occurring during photoablation of the cornea are incompletely understood. High speed laser-based photographic arrangement was constructed. The temporal resolution was better than 1 ns. The setup could work as a Schlieren arrangement, which is sensitive to the refractive index change caused by the shock wave propagating in the air above the eye. With minor changes the setup was converted into a shadowgraph, which could detect the ablation plume and the waves propagating on the surface of the eye. Due to the impact of the excimer laser pulse onto the surface of the cornea, a shock wave was generated in the air. The shadowgraph clearly showed the ejection of the ablated cornea. The ejection velocity of the plume was found to be over 600 m/s. It was shown for the first time that the recoil forces of the plume are generating a wave on the surface of the eye. The laser-based high speed photographic arrangement is a powerful arrangement in the study of physical effects occurring during photoablation of the cornea.
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Affiliation(s)
- Z Bor
- Department of Optics and Quantum Electronics, JATE University, Szeged, Hungary
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Bor Z, Hopp B, Rácz B, Szabó G, Ratkay I, Süveges I, Füst Á, Mohay J. Plume Emission, Shock Wave and Surface Wave Formation During Excimer Laser Ablation of the Cornea. J Refract Surg 1993. [DOI: 10.3928/1081-597x-19930302-31] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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