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Fernández V, Borrell V. Keep calm and make neurons: The effects of glucocorticoids on human cortical neurogenesis. Neuron 2024; 112:1373-1375. [PMID: 38697018 DOI: 10.1016/j.neuron.2024.04.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Revised: 04/04/2024] [Accepted: 04/04/2024] [Indexed: 05/04/2024]
Abstract
Maternal well-being is important for the development of the fetus, with a key influence on its nervous system. In this issue of Neuron, Krontira et al.1 implicate glucocorticoids, the stress hormones, in the regulation of neural stem cell identity and proliferation, with long-lasting consequences on brain architecture and educational attainment.
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Affiliation(s)
- Virginia Fernández
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant 03550, Spain
| | - Víctor Borrell
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant 03550, Spain.
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2
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Fernández V, Borrell V. Epi-regulate my brain: unlocking mechanisms of brain growth evolution. EMBO J 2024; 43:1385-1387. [PMID: 38528183 PMCID: PMC11021529 DOI: 10.1038/s44318-024-00083-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Accepted: 03/15/2024] [Indexed: 03/27/2024] Open
Abstract
A new study sheds light on the mechanisms of cerebral cortex expansion during evolution.
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Affiliation(s)
- Virginia Fernández
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, 03550, Spain
| | - Víctor Borrell
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, 03550, Spain.
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3
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Fernández V, Gausereide-Corral M, Valiente C, Sánchez-Iglesias I. Effectiveness of trauma-informed care interventions at the organizational level: A systematic review. Psychol Serv 2023; 20:849-862. [PMID: 36689374 DOI: 10.1037/ser0000737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Due to the recognition of the high prevalence and widespread effects of trauma, trauma-informed care (TIC) framework has emerged to address its impact and prevent retraumatization in the systems of care. Since organizational support has been identified as crucial in TIC implementation and sustainability, this systematic review assessed the status quo of TIC interventions which explicitly incorporate an organizational component. Our search yielded 880 articles, and 15 met the inclusion criteria. All the studies were carried out in the United States, more than half in mental health and Child Welfare Services, through longitudinal designs with no randomization or control group. All the studies utilized one to six organizational components, the most frequent related to presence of a defined leadership, procedures against retraumatization and provision of strength-based services. A wide variety of measures were used to assess the effectiveness of TIC interventions, with staff perceptions and safety management indicators being the most frequently used. In summary, the review indicates a positive trend in relation to the effectiveness of the interventions included in the study, with an improved functioning of beneficiaries, enhanced accessibility, and quality of services. However, the low quality and high heterogeneity of the studies make it difficult to draw conclusions with certainty. Therefore, the primary endeavor in TIC research is to provide more solid evidence. Partnerships between academic and community stakeholders will be of high value in this process. (PsycInfo Database Record (c) 2023 APA, all rights reserved).
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Affiliation(s)
- Virginia Fernández
- Department of Clinical Psychology, School of Psychology, Complutense University
| | | | - Carmen Valiente
- Department of Clinical Psychology, School of Psychology, Complutense University
| | - Iván Sánchez-Iglesias
- Department of Psychobiology and Methodology in Behavioral Sciences, School of Psychology, Complutense University
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4
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Fernández V, Borrell V. Developmental mechanisms of gyrification. Curr Opin Neurobiol 2023; 80:102711. [DOI: 10.1016/j.conb.2023.102711] [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] [Received: 11/11/2022] [Revised: 02/09/2023] [Accepted: 02/23/2023] [Indexed: 03/31/2023]
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5
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Benito-Sánchez B, Barroso A, Fernández V, Mercadillo F, Núñez-Torres R, Pita G, Pombo L, Morales-Chamorro R, Cano-Cano JM, Urioste M, González-Neira A, Osorio A. Apparent regional differences in the spectrum of BARD1 pathogenic variants in Spanish population and importance of copy number variants. Sci Rep 2022; 12:8547. [PMID: 35595798 PMCID: PMC9122922 DOI: 10.1038/s41598-022-12480-2] [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] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 05/11/2022] [Indexed: 12/22/2022] Open
Abstract
Only up to 25% of the cases in which there is a familial aggregation of breast and/or ovarian cancer are explained by germline mutations in the well-known BRCA1 and BRCA2 high-risk genes. Recently, the BRCA1-associated ring domain (BARD1), that partners BRCA1 in DNA repair, has been confirmed as a moderate-risk breast cancer susceptibility gene. Taking advantage of next-generation sequencing techniques, and with the purpose of defining the whole spectrum of possible pathogenic variants (PVs) in this gene, here we have performed a comprehensive mutational analysis of BARD1 in a cohort of 1946 Spanish patients who fulfilled criteria to be tested for germline pathogenic mutations in BRCA1 and BRCA2. We identified 22 different rare germline variants, being 5 of them clearly pathogenic or likely pathogenic large deletions, which account for 0.26% of the patients tested. Our results show that the prevalence and spectrum of mutations in the BARD1 gene might vary between different regions of Spain and expose the relevance to test for copy number variations.
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Affiliation(s)
- B Benito-Sánchez
- Familial Cancer Clinical Unit, Human Cancer Genetics Programme, Spanish National Cancer Research Centre (CNIO), 28029, Madrid, Spain
| | - A Barroso
- Familial Cancer Clinical Unit, Human Cancer Genetics Programme, Spanish National Cancer Research Centre (CNIO), 28029, Madrid, Spain
| | - V Fernández
- Familial Cancer Clinical Unit, Human Cancer Genetics Programme, Spanish National Cancer Research Centre (CNIO), 28029, Madrid, Spain
| | - F Mercadillo
- Familial Cancer Clinical Unit, Human Cancer Genetics Programme, Spanish National Cancer Research Centre (CNIO), 28029, Madrid, Spain
| | - R Núñez-Torres
- Human Genotyping Unit (CEGEN), Human Cancer Genetics Programme, Spanish National Cancer Research Centre (CNIO), 28029, Madrid, Spain
| | - G Pita
- Human Genotyping Unit (CEGEN), Human Cancer Genetics Programme, Spanish National Cancer Research Centre (CNIO), 28029, Madrid, Spain
| | - L Pombo
- Medical Oncology Section, Universitary Hospital Complex of Albacete, Albacete, Spain
| | - R Morales-Chamorro
- Medical Oncology Section, Hospitalary Compex La Mancha Centro, Alcázar de San Juan, Ciudad Real, Spain
| | - J M Cano-Cano
- Medical Oncology Service, Universitary General Hospital of Ciudad Real, Ciudad Real, Spain
| | - M Urioste
- Familial Cancer Clinical Unit, Human Cancer Genetics Programme, Spanish National Cancer Research Centre (CNIO), 28029, Madrid, Spain
| | - A González-Neira
- Human Genotyping Unit (CEGEN), Human Cancer Genetics Programme, Spanish National Cancer Research Centre (CNIO), 28029, Madrid, Spain
| | - A Osorio
- Familial Cancer Clinical Unit, Human Cancer Genetics Programme, Spanish National Cancer Research Centre (CNIO), 28029, Madrid, Spain.
- Spanish Network On Rare Diseases (CIBERER), 28029, Madrid, Spain.
- Familial Cancer Clinical Unit, Human Cancer Genetics Programme, Spanish National Cancer Research Centre (CNIO), C/Melchor Fernández Almagro 3, 29029, Madrid, Spain.
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6
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Piloni NE, Vargas R, Fernández V, Videla LA, Puntarulo S. Effects of acute iron overload on Nrf2-related glutathione metabolism in rat brain. Biometals 2021; 34:1017-1027. [PMID: 34136984 DOI: 10.1007/s10534-021-00324-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 06/08/2021] [Indexed: 02/08/2023]
Abstract
Iron (Fe) overload triggers free radical production and lipid peroxidation processes that may lead to cell death (ferroptosis). The hypothesis of this work was that acute Fe-dextran treatment triggers Nrf2-mediated antioxidant regulation in rat brain involving glutathione (GSH) metabolism. Over the initial 8 h after Fe-dextran administration (single dose of 500 mg Fe-dextran/kg), total Fe, malondialdehyde (MDA) content, glutathione peroxidase (GPx), GPx-Se dependent (GPx-Se) and glutathione S-transferases (GST) activities were increased in rat whole brain. The content of GSH and the activity of glutathione reductase (GR) showed decreases (p < 0.05) after 6 and 8 h post injection in cortex. A significant increase in nuclear Nrf2 protein levels over control values was achieved after 6 h of Fe-dextran administration, while no significant differences were observed in the cytosolic fraction. Nuclear Nrf2/cytosolic Nrf2 ratios showed enhancement (p < 0.05) after 6 h of Fe overload, suggesting a greater translocation of the factor to the nucleus. No significant differences were observed in the expression of Keap1 in nuclear or cytosolic extracts. It is concluded that acute Fe overload induces oxidative stress in rat brain with the concomitant lipid peroxidation increase and GSH depletion, leading to the elevation of Nrf2-controlled GPx, GPx-Se and GST protein expression as a protective adaptive response. Further studies are required to fully comprehend the complex network of interrelated processes keeping the balance of GSH functions as chelator, antioxidant and redox buffer in the understanding of the ferroptotic and hormetic mechanisms triggered by Fe overload in brain.
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Affiliation(s)
- Natacha E Piloni
- Fisicoquímica-IBIMOL, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, CAAD1113, Buenos Aires, Argentina.,Instituto de Bioquímica y Medicina Molecular (IBIMOL), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Romina Vargas
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Virginia Fernández
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Luis A Videla
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Susana Puntarulo
- Fisicoquímica-IBIMOL, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, CAAD1113, Buenos Aires, Argentina. .,Instituto de Bioquímica y Medicina Molecular (IBIMOL), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina.
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7
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Prieto-Colomina A, Fernández V, Chinnappa K, Borrell V. MiRNAs in early brain development and pediatric cancer: At the intersection between healthy and diseased embryonic development. Bioessays 2021; 43:e2100073. [PMID: 33998002 DOI: 10.1002/bies.202100073] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/12/2021] [Accepted: 04/15/2021] [Indexed: 12/15/2022]
Abstract
The size and organization of the brain are determined by the activity of progenitor cells early in development. Key mechanisms regulating progenitor cell biology involve miRNAs. These small noncoding RNA molecules bind mRNAs with high specificity, controlling their abundance and expression. The role of miRNAs in brain development has been studied extensively, but their involvement at early stages remained unknown until recently. Here, recent findings showing the important role of miRNAs in the earliest phases of brain development are reviewed, and it is discussed how loss of specific miRNAs leads to pathological conditions, particularly adult and pediatric brain tumors. Let-7 miRNA downregulation and the initiation of embryonal tumors with multilayered rosettes (ETMR), a novel link recently discovered by the laboratory, are focused upon. Finally, it is discussed how miRNAs may be used for the diagnosis and therapeutic treatment of pediatric brain tumors, with the hope of improving the prognosis of these devastating diseases.
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Affiliation(s)
- Anna Prieto-Colomina
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
| | - Virginia Fernández
- Neurobiology of miRNA, Fondazione Istituto Italiano di Tecnologia (IIT), Genoa, Italy
| | - Kaviya Chinnappa
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
| | - Víctor Borrell
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
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8
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Fernández V, Martínez-Martínez MÁ, Prieto-Colomina A, Cárdenas A, Soler R, Dori M, Tomasello U, Nomura Y, López-Atalaya JP, Calegari F, Borrell V. Repression of Irs2 by let-7 miRNAs is essential for homeostasis of the telencephalic neuroepithelium. EMBO J 2020; 39:e105479. [PMID: 32985705 PMCID: PMC7604626 DOI: 10.15252/embj.2020105479] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 08/21/2020] [Accepted: 08/28/2020] [Indexed: 01/01/2023] Open
Abstract
Structural integrity and cellular homeostasis of the embryonic stem cell niche are critical for normal tissue development. In the telencephalic neuroepithelium, this is controlled in part by cell adhesion molecules and regulators of progenitor cell lineage, but the specific orchestration of these processes remains unknown. Here, we studied the role of microRNAs in the embryonic telencephalon as key regulators of gene expression. By using the early recombiner Rx-Cre mouse, we identify novel and critical roles of miRNAs in early brain development, demonstrating they are essential to preserve the cellular homeostasis and structural integrity of the telencephalic neuroepithelium. We show that Rx-Cre;DicerF/F mouse embryos have a severe disruption of the telencephalic apical junction belt, followed by invagination of the ventricular surface and formation of hyperproliferative rosettes. Transcriptome analyses and functional experiments in vivo show that these defects result from upregulation of Irs2 upon loss of let-7 miRNAs in an apoptosis-independent manner. Our results reveal an unprecedented relevance of miRNAs in early forebrain development, with potential mechanistic implications in pediatric brain cancer.
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Affiliation(s)
- Virginia Fernández
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
| | - Maria Ángeles Martínez-Martínez
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
| | - Anna Prieto-Colomina
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
| | - Adrián Cárdenas
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
| | - Rafael Soler
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
| | - Martina Dori
- CRTD-Center for Regenerative Therapies, School of Medicine, Technische Universität Dresden, Dresden, Germany
| | - Ugo Tomasello
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
| | - Yuki Nomura
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
| | - José P López-Atalaya
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
| | - Federico Calegari
- CRTD-Center for Regenerative Therapies, School of Medicine, Technische Universität Dresden, Dresden, Germany
| | - Víctor Borrell
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
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9
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Villa AM, Fernández V. [Spectrum of optic neuromyelitis: Psychiatric disorders and suicide risk]. Neurologia 2020. [PMID: 32900527 DOI: 10.1016/j.nrl.2020.07.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Affiliation(s)
- A M Villa
- Hospital General de Agudos Dr. José María Ramos Mejía, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina.
| | - V Fernández
- Hospital General de Agudos Dr. José María Ramos Mejía, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
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10
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Andrés F, Kinoshita A, Kalluri N, Fernández V, Falavigna VS, Cruz TMD, Jang S, Chiba Y, Seo M, Mettler-Altmann T, Huettel B, Coupland G. The sugar transporter SWEET10 acts downstream of FLOWERING LOCUS T during floral transition of Arabidopsis thaliana. BMC Plant Biol 2020; 20:53. [PMID: 32013867 PMCID: PMC6998834 DOI: 10.1186/s12870-020-2266-0] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 01/27/2020] [Indexed: 05/19/2023]
Abstract
BACKGROUND Floral transition initiates reproductive development of plants and occurs in response to environmental and endogenous signals. In Arabidopsis thaliana, this process is accelerated by several environmental cues, including exposure to long days. The photoperiod-dependent promotion of flowering involves the transcriptional induction of FLOWERING LOCUS T (FT) in the phloem of the leaf. FT encodes a mobile protein that is transported from the leaves to the shoot apical meristem, where it forms part of a regulatory complex that induces flowering. Whether FT also has biological functions in leaves of wild-type plants remains unclear. RESULTS In order to address this issue, we first studied the leaf transcriptomic changes associated with FT overexpression in the companion cells of the phloem. We found that FT induces the transcription of SWEET10, which encodes a bidirectional sucrose transporter, specifically in the leaf veins. Moreover, SWEET10 is transcriptionally activated by long photoperiods, and this activation depends on FT and one of its earliest target genes SUPPRESSOR OF CONSTANS OVEREXPRESSION 1 (SOC1). The ectopic expression of SWEET10 causes early flowering and leads to higher levels of transcription of flowering-time related genes in the shoot apex. CONCLUSIONS Collectively, our results suggest that the FT-signaling pathway activates the transcription of a sucrose uptake/efflux carrier during floral transition, indicating that it alters the metabolism of flowering plants as well as reprogramming the transcription of floral regulators in the shoot meristem.
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Affiliation(s)
- Fernando Andrés
- Max Planck Institute for Plant Breeding Research, Carl-von-Linne-Weg 10, 50829 Köln, Germany
- Present Address: UMR AGAP, Univ. Montpellier, INRAE, CIRAD, INSAAE, Montpellier, France
| | - Atsuko Kinoshita
- Max Planck Institute for Plant Breeding Research, Carl-von-Linne-Weg 10, 50829 Köln, Germany
| | - Naveen Kalluri
- Max Planck Institute for Plant Breeding Research, Carl-von-Linne-Weg 10, 50829 Köln, Germany
| | - Virginia Fernández
- Max Planck Institute for Plant Breeding Research, Carl-von-Linne-Weg 10, 50829 Köln, Germany
- Present Address: BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier, France
| | - Vítor S. Falavigna
- Max Planck Institute for Plant Breeding Research, Carl-von-Linne-Weg 10, 50829 Köln, Germany
| | - Tiago M. D. Cruz
- Max Planck Institute for Plant Breeding Research, Carl-von-Linne-Weg 10, 50829 Köln, Germany
| | - Seonghoe Jang
- Max Planck Institute for Plant Breeding Research, Carl-von-Linne-Weg 10, 50829 Köln, Germany
- Present Address: World Vegetable Center Korea Office (WKO), 100 Nongsaengmyeong-ro, Iseo-myeon, Wanju-gun, Jellabuk-do 55365 Republic of Korea
| | - Yasutaka Chiba
- RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045 Japan
| | - Mitsunori Seo
- RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045 Japan
| | - Tabea Mettler-Altmann
- Cluster of Excellence on Plant Sciences and Institute of Plant Biochemistry, Heinrich-Heine University, 40225 Düsseldorf, Germany
| | - Bruno Huettel
- Max Planck Institute for Plant Breeding Research, Carl-von-Linne-Weg 10, 50829 Köln, Germany
| | - George Coupland
- Max Planck Institute for Plant Breeding Research, Carl-von-Linne-Weg 10, 50829 Köln, Germany
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11
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Milutinovic M, Lindsey BE, Wijeratne A, Hernandez JM, Grotewold N, Fernández V, Grotewold E, Brkljacic J. Arabidopsis EMSY-like (EML) histone readers are necessary for post-fertilization seed development, but prevent fertilization-independent seed formation. Plant Sci 2019; 285:99-109. [PMID: 31203898 DOI: 10.1016/j.plantsci.2019.04.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 04/07/2019] [Accepted: 04/09/2019] [Indexed: 06/09/2023]
Abstract
Seed development is a complex regulatory process that includes a transition from gametophytic to sporophytic program. The synchronized development of different seed compartments (seed coat, endosperm and embryo) depends on a balance in parental genome contributions. In the most severe cases, the disruption of the balance leads to seed abortion. This represents one of the main obstacles for the engineering of asexual reproduction through seeds (apomixis), and for generating new interspecies hybrids. The repression of auxin synthesis by the Polycomb Repressive Complex 2 (PRC2) is a major mechanism contributing to sensing genome balance. However, current efforts focusing on decreasing PRC2 or elevating auxin levels have not yet resulted in the production of apomictic seed. Here, we show that EMSY-Like Tudor/Agenet H3K36me3 histone readers EML1 and EML3 are necessary for early stages of seed development to proceed at a normal rate in Arabidopsis. We further demonstrate that both EML1 and EML3 are required to prevent the initiation of seed development in the absence of fertilization. Based on the whole genome expression analysis, we identify auxin transport and signaling genes as the most enriched downstream targets of EML1 and EML3. We hypothesize that EML1 and EML3 function to repress and soften paternal gene expression by fine-tuning auxin responses. Discovery of this pathway may contribute to the engineering of apomixis and interspecies hybrids.
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Affiliation(s)
- Milica Milutinovic
- Arabidopsis Biological Resource Center, The Ohio State University, Columbus, OH, 43210, USA
| | - Benson E Lindsey
- Arabidopsis Biological Resource Center, The Ohio State University, Columbus, OH, 43210, USA
| | - Asela Wijeratne
- Department of Molecular Genetics, Center for Applied Plant Sciences, The Ohio State University, Columbus, OH, 43210, USA
| | - J Marcela Hernandez
- Department of Molecular Genetics, Center for Applied Plant Sciences, The Ohio State University, Columbus, OH, 43210, USA
| | - Nikolas Grotewold
- Arabidopsis Biological Resource Center, The Ohio State University, Columbus, OH, 43210, USA
| | - Virginia Fernández
- Arabidopsis Biological Resource Center, The Ohio State University, Columbus, OH, 43210, USA
| | - Erich Grotewold
- Department of Molecular Genetics, Center for Applied Plant Sciences, The Ohio State University, Columbus, OH, 43210, USA.
| | - Jelena Brkljacic
- Arabidopsis Biological Resource Center, The Ohio State University, Columbus, OH, 43210, USA.
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12
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Durán-Vian C, Arias-Loste MT, Hernández JL, Fernández V, González M, Iruzubieta P, Rasines L, González-Vela C, Vaqué JP, Blanco R, Crespo J, González-López MA. High prevalence of non-alcoholic fatty liver disease among hidradenitis suppurativa patients independent of classic metabolic risk factors. J Eur Acad Dermatol Venereol 2019; 33:2131-2136. [PMID: 31260574 DOI: 10.1111/jdv.15764] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Accepted: 06/18/2019] [Indexed: 12/13/2022]
Abstract
BACKGROUND Some chronic inflammatory skin diseases, such as psoriasis, have been associated with an increased prevalence of non-alcoholic fatty liver disease (NAFLD). Nevertheless, this prevalence in hidradenitis suppurativa (HS) has not been assessed to date. OBJECTIVES To determine the prevalence of NAFLD in patients with HS and the risk factors associated with this disorder. METHODS This case-control study enrolled 70 HS patients and 150 age- and gender-matched controls who were evaluated by hepatic ultrasonography (US) and transient elastography (TE) after excluding other secondary causes of chronic liver disease. The diagnosis of NAFLD was established if US and/or TE were altered. RESULTS The prevalence of NAFLD was significantly increased in patients with HS compared to controls (72.9% vs. 24.7%: P < 0.001). In the multivariable regression model adjusted for age, sex and classic metabolic risk factors for NAFLD, HS was significantly and independently associated with the presence of NAFLD [OR 7.75 confidence interval (CI) 2.54-23.64; P < 0.001]. CONCLUSIONS Our results show a high prevalence of NAFLD in HS patients independent of classic metabolic risk factors. Therefore, we suggest HS patients to be evaluated for NAFLD and managed accordingly.
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Affiliation(s)
- C Durán-Vian
- Dermatology Department, University Hospital Marqués de Valdecilla, University of Cantabria, IDIVAL, Santander, Spain
| | - M T Arias-Loste
- Gastroenterology and Hepatology Department, University Hospital Marqués de Valdecilla, University of Cantabria, IDIVAL, Santander, Spain.,Investigation Institute Marques de Valdecilla, Infection, Immunity and Digestive Diseases Group, IDIVAL, Santander, Spain
| | - J L Hernández
- Internal Medicine Department, University Hospital Marqués de Valdecilla, University of Cantabria, IDIVAL, Santander, Spain
| | - V Fernández
- Radiology Department, University Hospital Marqués de Valdecilla, University of Cantabria, Santander, Spain
| | - M González
- Gastroenterology and Hepatology Department, University Hospital Marqués de Valdecilla, University of Cantabria, IDIVAL, Santander, Spain
| | - P Iruzubieta
- Gastroenterology and Hepatology Department, University Hospital Marqués de Valdecilla, University of Cantabria, IDIVAL, Santander, Spain.,Investigation Institute Marques de Valdecilla, Infection, Immunity and Digestive Diseases Group, IDIVAL, Santander, Spain
| | - L Rasines
- Investigation Institute Marques de Valdecilla, Infection, Immunity and Digestive Diseases Group, IDIVAL, Santander, Spain
| | - C González-Vela
- Pathology Department, University Hospital Marqués de Valdecilla, University of Cantabria, IDIVAL, Santander, Spain
| | - J P Vaqué
- Investigation Institute Marques de Valdecilla, Infection, Immunity and Digestive Diseases Group, IDIVAL, Santander, Spain.,Molecular Biology Department, University of Cantabria, Santander, Spain
| | - R Blanco
- Rheumatology Department, University Hospital Marqués de Valdecilla, University of Cantabria, IDIVAL, Santander, Spain
| | - J Crespo
- Gastroenterology and Hepatology Department, University Hospital Marqués de Valdecilla, University of Cantabria, IDIVAL, Santander, Spain.,Investigation Institute Marques de Valdecilla, Infection, Immunity and Digestive Diseases Group, IDIVAL, Santander, Spain
| | - M A González-López
- Dermatology Department, University Hospital Marqués de Valdecilla, University of Cantabria, IDIVAL, Santander, Spain
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13
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Vargas R, Riquelme B, Fernández J, Álvarez D, Pérez IF, Cornejo P, Fernández V, Videla LA. Docosahexaenoic acid-thyroid hormone combined protocol as a novel approach to metabolic stress disorders: Relation to mitochondrial adaptation via liver PGC-1α and sirtuin1 activation. Biofactors 2019; 45:271-278. [PMID: 30578580 DOI: 10.1002/biof.1483] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 11/20/2018] [Accepted: 11/26/2018] [Indexed: 12/13/2022]
Abstract
Docosahexaenoic acid (DHA) and 3,3',5-triiodothyronine (T3 ) combined protocol affords protection against liver injury via AMPK signaling supporting energy requirements. The aim of this work was to test the hypothesis that a DHA + T3 accomplish mitochondrial adaptation through downstream upregulation of PPAR-γ coactivator 1α (PGC-1α). Male Sprague-Dawley rats were given daily oral doses of 300 mg DHA/kg or saline (controls) for three consecutive days, followed by 0.05 mg T3 /kg (or hormone vehicle) ip at the fourth day, or single dose of 0.1 mg T3 /kg alone. Liver mRNA levels were assayed by qPCR, NAD+ /NADH ratios, hepatic proteins, histone 3 acetylation and serum T3 and β-hydroxybutyrate levels were determined by specific ELISA kits. Combined DHA + T3 protocol led to increased liver AMPK, PGC-1α, NRF-2, COX-IV, and β-ATP synthase mRNAs, with concomitant higher protein levels of COX-IV and NRF-2, 369% enhancement in the NAD+ /NADH ratio, 47% decrease in histone 3 acetylation and 162% increase in serum levels of β-hydroxybutyrate over control values. These changes were reproduced by the higher dose of T3 without major alterations by DHA or T3 alone. In conclusion, liver mitochondrial adaptation by DHA + T3 is associated with PGC-1α upregulation involving enhanced transcription of the coactivator, which may be contributed by PGC-1α deacetylation and phosphorylation by SIRT1 and AMPK activation, respectively. This contention is supported by NRF-2-dependent enhancement in COX-1 and β-ATP synthase induction with higher fatty acid oxidation resulting in a significant ketogenic response, which may represent a suitable strategy for hepatic steatosis with future clinical applications. © 2018 BioFactors, 45(2):271-278, 2019.
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Affiliation(s)
- Romina Vargas
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Bárbara Riquelme
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Javier Fernández
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Daniela Álvarez
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Ignacio F Pérez
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Pamela Cornejo
- Health and Odontology Faculty, Diego Portales University, Santiago, Chile
| | - Virginia Fernández
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Luis A Videla
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
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14
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Martínez-Martínez MÁ, Ciceri G, Espinós A, Fernández V, Marín O, Borrell V. Extensive branching of radially-migrating neurons in the mammalian cerebral cortex. J Comp Neurol 2019; 527:1558-1576. [PMID: 30520050 DOI: 10.1002/cne.24597] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [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: 06/29/2018] [Revised: 11/22/2018] [Accepted: 11/28/2018] [Indexed: 11/06/2022]
Abstract
Excitatory neurons of the cerebral cortex migrate radially from their place of birth to their final position in the cortical plate during development. Radially-migrating neurons display a single leading process that establishes the direction of movement. This leading process has been described as being unbranched, and the occurrence of branches proposed to impair radial migration. Here we have analyzed the detailed morphology of leading process in radially-migrating pyramidal neurons and its impact on radial migration. We have compared ferret and mouse to identify differences between cortices that undergo folding or not. In mouse, we find that half of radially-migrating neurons exhibit a branched leading process, this being even more frequent in ferret. Branched leading processes are less parallel to radial glia fibers than those unbranched, suggesting some independence from radial glia fibers. Two-photon videomicroscopy revealed that a vast majority of neurons branch their leading process at some point during radial migration, but this does not reduce their migration speed. We have tested the functional impact of exuberant leading process branching by expressing a dominant negative Cdk5. We confirm that loss of Cdk5 function significantly impairs radial migration, but this is independent from increased branching of the leading process. We propose that excitatory neurons may branch their leading process as an evolutionary mechanism to allow cells changing their trajectory of migration to disperse laterally, such that increased branching in gyrencephalic species favors the tangential dispersion of radially-migrating neurons, and cortical folding.
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Affiliation(s)
- Maria Á Martínez-Martínez
- Instituto de Neurociencias, Agencia Estatal Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, San Juan de Alicante, Spain
| | - Gabriele Ciceri
- Instituto de Neurociencias, Agencia Estatal Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, San Juan de Alicante, Spain
| | - Alexandre Espinós
- Instituto de Neurociencias, Agencia Estatal Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, San Juan de Alicante, Spain
| | - Virginia Fernández
- Instituto de Neurociencias, Agencia Estatal Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, San Juan de Alicante, Spain
| | - Oscar Marín
- Instituto de Neurociencias, Agencia Estatal Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, San Juan de Alicante, Spain.,Centre for Developmental Neurobiology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, United Kingdom.,MRC Centre for Neurodevelopmental Disorders, King's College London, London, United Kingdom
| | - Víctor Borrell
- Instituto de Neurociencias, Agencia Estatal Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, San Juan de Alicante, Spain
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15
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Montagut C, Alonso V, Escudero P, Fernández-Martos C, Salud Salvia A, Méndez M, Gallego Plazas J, Rodriguez J, Martín-Richard M, Fernández-Plana J, Aparicio J, Feliu Batlle J, García de Albéniz X, Rojo F, Fernández V, Claes B, Maertens G, Sablon E, Jacobs B, Maurel J. Clinical impact of circulating tumor RAS and BRAF mutation dynamics in metastatic colorectal cancer patients treated with first-line chemotherapy plus anti-EGFR therapy: Combined analysis of two prospective clinical trials. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy281.091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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16
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Severing E, Faino L, Jamge S, Busscher M, Kuijer-Zhang Y, Bellinazzo F, Busscher-Lange J, Fernández V, Angenent GC, Immink RGH, Pajoro A. Arabidopsis thaliana ambient temperature responsive lncRNAs. BMC Plant Biol 2018; 18:145. [PMID: 30005624 PMCID: PMC6045843 DOI: 10.1186/s12870-018-1362-x] [Citation(s) in RCA: 35] [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] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 07/04/2018] [Indexed: 05/05/2023]
Abstract
BACKGROUND Long non-coding RNAs (lncRNAs) have emerged as new class of regulatory molecules in animals where they regulate gene expression at transcriptional and post-transcriptional level. Recent studies also identified lncRNAs in plant genomes, revealing a new level of transcriptional complexity in plants. Thousands of lncRNAs have been predicted in the Arabidopsis thaliana genome, but only a few have been studied in depth. RESULTS Here we report the identification of Arabidopsis lncRNAs that are expressed during the vegetative stage of development in either the shoot apical meristem or in leaves. We found that hundreds of lncRNAs are expressed in these tissues, of which 50 show differential expression upon an increase in ambient temperature. One of these lncRNAs, FLINC, is down-regulated at higher ambient temperature and affects ambient temperature-mediated flowering in Arabidopsis. CONCLUSION A number of ambient temperature responsive lncRNAs were identified with potential roles in the regulation of temperature-dependent developmental changes, such as the transition from the vegetative to the reproductive (flowering) phase. The challenge for the future is to characterize the biological function and molecular mode of action of the large number of ambient temperature-regulated lncRNAs that have been identified in this study.
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Affiliation(s)
- Edouard Severing
- Max Planck Institute for Plant Breeding Research, 50829 Köln, Germany
| | - Luigi Faino
- Laboratory of Phytopathology, Wageningen University and Research, 6708PB Wageningen, The Netherlands
| | - Suraj Jamge
- Laboratory of Molecular Biology, Wageningen University and Research, 6708PB, Wageningen, The Netherlands
- Bioscience, Wageningen University and Research, 6708PB Wageningen, The Netherlands
| | - Marco Busscher
- Bioscience, Wageningen University and Research, 6708PB Wageningen, The Netherlands
| | - Yang Kuijer-Zhang
- Bioscience, Wageningen University and Research, 6708PB Wageningen, The Netherlands
| | - Francesca Bellinazzo
- Bioscience, Wageningen University and Research, 6708PB Wageningen, The Netherlands
| | | | | | - Gerco C. Angenent
- Laboratory of Molecular Biology, Wageningen University and Research, 6708PB, Wageningen, The Netherlands
- Bioscience, Wageningen University and Research, 6708PB Wageningen, The Netherlands
| | - Richard G. H. Immink
- Laboratory of Molecular Biology, Wageningen University and Research, 6708PB, Wageningen, The Netherlands
- Bioscience, Wageningen University and Research, 6708PB Wageningen, The Netherlands
| | - Alice Pajoro
- Max Planck Institute for Plant Breeding Research, 50829 Köln, Germany
- Laboratory of Molecular Biology, Wageningen University and Research, 6708PB, Wageningen, The Netherlands
- Bioscience, Wageningen University and Research, 6708PB Wageningen, The Netherlands
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17
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Videla LA, Vargas R, Riquelme B, Fernández J, Fernández V. Thyroid Hormone-Induced Expression of the Hepatic Scaffold Proteins Sestrin2, β-Klotho, and FRS2α in Relation to FGF21-AMPK Signaling. Exp Clin Endocrinol Diabetes 2017; 126:182-186. [PMID: 28895643 DOI: 10.1055/s-0043-115533] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Thyroid hormone (3,3',5-triiodothyronine, T3) accelerates energy metabolism in the liver through mechanisms involving upregulation of AMP-activated protein kinase (AMPK). This study aims to assess the influence of T3 on the expression of the scaffold proteins β-Klotho, fibroblast growth factor receptor substrate 2α (FRS2α), and Sestrin2 in relation to FGF21-AMPK signaling. Male Sprague-Dawley rats were given 0.1 mg T3/kg or hormone vehicle (controls) and studies were done 24 h after treatment. These include measurements of the mRNA expression (qPCR) of hepatic β-Klotho, FGF21, FGF21 receptor-1 (FGFR1), extracellular-signal-regulated kinase 1/2 (ERK1/2), FRS2α, ribosomal S6 kinase-1 (RSK1), liver kinase B1 (LKB1), AMPK, and Sestrin2. Also, protein levels of FGF21, FGFR1 (ELISA), and ERK1/2 (Western blot) were measured. T3 elicited a calorigenic response with higher hepatic mRNA expression of β-Klotho, FRS2α, and FGF21, increased serum FGF21, without changes in liver FGFR1 mRNA and its plasma levels. In addition, T3 enhanced ERK1/2 phosphorylation and the mRNA expression of ERK1/2, RSK1, LKB1, AMPK, and Sestrin2. T3 administration enhances liver FGF21-AMPK signaling involving upregulation of the scaffold proteins β-Klotho, FRS2α, and Sestrin2. β-Klotho and FRS2 induction favours the operation of the FGF21-FGFR1-β-Klotho complex as evidenced by the enhancement in ERK1/2 phosphorylation, whereas that of Sestrin2 recruits LKB1 to achieved AMPK activation, thus supporting a higher energy expenditure condition that may be desirable in some metabolic disorders.
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Affiliation(s)
- Luis A Videla
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Romina Vargas
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Barbara Riquelme
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Javier Fernández
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Virginia Fernández
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
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18
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Hayama R, Sarid-Krebs L, Richter R, Fernández V, Jang S, Coupland G. PSEUDO RESPONSE REGULATORs stabilize CONSTANS protein to promote flowering in response to day length. EMBO J 2017; 36:904-918. [PMID: 28270524 PMCID: PMC5376961 DOI: 10.15252/embj.201693907] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [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: 01/20/2016] [Revised: 01/31/2017] [Accepted: 02/01/2017] [Indexed: 11/09/2022] Open
Abstract
Seasonal reproduction in many organisms requires detection of day length. This is achieved by integrating information on the light environment with an internal photoperiodic time-keeping mechanism. Arabidopsis thaliana promotes flowering in response to long days (LDs), and CONSTANS (CO) transcription factor represents a photoperiodic timer whose stability is higher when plants are exposed to light under LDs. Here, we show that PSEUDO RESPONSE REGULATOR (PRR) proteins directly mediate this stabilization. PRRs interact with and stabilize CO at specific times during the day, thereby mediating its accumulation under LDs. PRR-mediated stabilization increases binding of CO to the promoter of FLOWERING LOCUS T (FT), leading to enhanced FT transcription and early flowering under these conditions. PRRs were previously reported to contribute to timekeeping by regulating CO transcription through their roles in the circadian clock. We propose an additional role for PRRs in which they act upon CO protein to promote flowering, directly coupling information on light exposure to the timekeeper and allowing recognition of LDs.
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Affiliation(s)
- Ryosuke Hayama
- Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, Cologne, Germany
| | - Liron Sarid-Krebs
- Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, Cologne, Germany
| | - René Richter
- Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, Cologne, Germany
| | - Virginia Fernández
- Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, Cologne, Germany
| | - Seonghoe Jang
- Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, Cologne, Germany
| | - George Coupland
- Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, Cologne, Germany
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19
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Videla LA, Fernández V, Vargas R, Cornejo P, Tapia G, Varela N, Valenzuela R, Arenas A, Fernández J, Hernández-Rodas MC, Riquelme B. Upregulation of rat liver PPARα-FGF21 signaling by a docosahexaenoic acid and thyroid hormone combined protocol. Biofactors 2016; 42:638-646. [PMID: 27248050 DOI: 10.1002/biof.1300] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 05/02/2016] [Accepted: 05/04/2016] [Indexed: 12/16/2022]
Abstract
Prevention of ischemia-reperfusion liver injury is achieved by a combined omega-3 and thyroid hormone (T3 ) protocol, which may involve peroxisome-proliferator activated receptor-α (PPAR-α)-fibroblast growth factor 21 (FGF21) signaling supporting energy requirements. Combined docosahexaenoic acid (DHA; daily doses of 300 mg/kg for 3 days) plus 0.05 mg T3 /kg given to fed rats elicited higher hepatic DHA contents and serum T3 levels, increased PPAR-α mRNA and its DNA binding, with higher mRNA expression of the PPAR-α target genes for carnitine-palmitoyl transferase 1α, acyl-CoA oxidase, and 3-hydroxyl-3-methylglutaryl-CoA synthase 2, effects that were mimicked by 0.1 mg T3 /kg given alone or by the PPAR-α agonist WY-14632. Under these conditions, the mRNA expression of retinoic X receptor-α (RXR-α) is also increased, with concomitant elevation of the hepatic mRNA and protein FGF21 levels and those of serum FGF21. It is concluded that PPAR-α-FGF21 induction by DHA combined with T3 may involve ligand activation of PPAR-α by DHA and enhanced expression of PPAR-α by T3 , with consequent upregulation of the FGF21 that is controlled by PPAR-α. Considering the beneficial effects of PPAR-α-FGF21 signaling on carbohydrate and lipid metabolism, further investigations are required to clarify its potential therapeutic applications in human metabolic disorders. © 2016 BioFactors, 42(6):638-646, 2016.
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Affiliation(s)
- Luis A Videla
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Virginia Fernández
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Romina Vargas
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Pamela Cornejo
- School of Medical Technology, Faculty of Health and Odontology, Diego Portales University, Santiago, Chile
| | - Gladys Tapia
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Nelson Varela
- Department of Medical Technology, Faculty of Medicine, University of Chile, Chile
| | - Rodrigo Valenzuela
- Nutrition Department, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Allan Arenas
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Javier Fernández
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | | | - Bárbara Riquelme
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
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20
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Tapia G, Cornejo P, Ferreira J, Fernández V, Videla LA. Acetaminophen-induced liver oxidative stress and hepatotoxicity: influence of Kupffer cell activity assessed in the isolated perfused rat liver. Redox Rep 2016; 3:213-8. [DOI: 10.1080/13510002.1997.11747112] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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21
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Fernández V, Videla LA. Respective roles of nitric oxide and superoxide radical in the respiratory burst activity of rat polymorphonuclear leukocytes induced by hyperthyroidism. Redox Rep 2016; 2:317-21. [DOI: 10.1080/13510002.1996.11747067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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22
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Himschoot PH, Fernández V, Arciet J, Goldsmidt V, Fabricant J. Rio de la Plata and its Maritime Front Environmental Information System and Portal: tools used and lessons learned. Information Development 2016. [DOI: 10.1177/0266666904049425] [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] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Paper presented at the Sixth Water Information Summit: Breaking The Barriers Let Water Information Flow! Waterweb Consortium and IRC International Water and Sanitation Centre September 9-12 Delft, The Netherlands 2003. Describes the aims, development and functions of the Integrated Information System of the FREPLATA Project and the creation of the Rio de la Plata and its Maritime Front Portal, a cooperative Internet gateway to environmental and spatial information on the Rio de Plata region. The FREPLATA project is a cooperative activity of 18 institutions in Argentina and Uruguay. The Project and institutions with suitably trained personnel designed, developed and implemented databases, applications and standards which enable the systematization of information and constitute tools for management and decision-making.
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23
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Fernández V, Takahashi Y, Le Gourrierec J, Coupland G. Photoperiodic and thermosensory pathways interact through CONSTANS to promote flowering at high temperature under short days. Plant J 2016; 86:426-40. [PMID: 27117775 DOI: 10.1111/tpj.13183] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Revised: 02/24/2016] [Accepted: 03/21/2016] [Indexed: 05/18/2023]
Abstract
Plants detect changes in day length to induce seasonal patterns of flowering. The photoperiodic pathway accelerates the flowering of Arabidopsis thaliana under long days (LDs) whereas it is inactive under short days (SDs), resulting in delayed flowering. This delay is overcome by exposure of plants to high temperature (27°C) under SDs (27°C-SD). Previously, the high-temperature flowering response was proposed to involve either the impaired activity of MADS-box transcription factor (TF) floral repressors or PHYTOCHROME-INTERACTING FACTOR 4 (PIF4) TF-mediated activation of FLOWERING LOCUS T (FT), which encodes the output signal of the photoperiodic pathway. We integrate these observations by studying several PIFs, the MADS-box SHORT VEGETATIVE PHASE (SVP) and the photoperiodic pathway under 27°C-SD. We find that the mRNAs of FT and its paralogue TWIN SISTER OF FT (TSF) are increased at dusk under 27°C-SD compared with 21°C-SD, and that this requires PIF4 and PIF5 as well as CONSTANS (CO), a TF that promotes flowering under LDs. The CO and PIF4 proteins are present at dusk under 27°C-SD, and they physically interact. Although Col-0 plants flower at similar times under 27°C-SD and 21°C-LD the expression level of FT is approximately 10-fold higher under 21°C-LD, suggesting that responsiveness to FT is also increased under 27°C-SD, perhaps as a result of the reduced activity of SVP in the meristem. Accordingly, only svp-41 ft-10 tsf-1 plants flowered at the same time under 21°C-SD and 27°C-SD. Thus, we propose that under non-inductive SDs, elevated temperatures increase the activity and sensitize the response to the photoperiod pathway.
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Affiliation(s)
- Virginia Fernández
- Max Planck Institute for Plant Breeding Research, Carl von Linné Weg 10, D-50829, Cologne, Germany
| | - Yasuyuki Takahashi
- Max Planck Institute for Plant Breeding Research, Carl von Linné Weg 10, D-50829, Cologne, Germany
| | - José Le Gourrierec
- Max Planck Institute for Plant Breeding Research, Carl von Linné Weg 10, D-50829, Cologne, Germany
| | - George Coupland
- Max Planck Institute for Plant Breeding Research, Carl von Linné Weg 10, D-50829, Cologne, Germany
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24
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Fernández V, Llinares-Benadero C, Borrell V. Cerebral cortex expansion and folding: what have we learned? EMBO J 2016; 35:1021-44. [PMID: 27056680 PMCID: PMC4868950 DOI: 10.15252/embj.201593701] [Citation(s) in RCA: 199] [Impact Index Per Article: 24.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 02/23/2016] [Accepted: 03/17/2016] [Indexed: 01/22/2023] Open
Abstract
One of the most prominent features of the human brain is the fabulous size of the cerebral cortex and its intricate folding. Cortical folding takes place during embryonic development and is important to optimize the functional organization and wiring of the brain, as well as to allow fitting a large cortex in a limited cranial volume. Pathological alterations in size or folding of the human cortex lead to severe intellectual disability and intractable epilepsy. Hence, cortical expansion and folding are viewed as key processes in mammalian brain development and evolution, ultimately leading to increased intellectual performance and, eventually, to the emergence of human cognition. Here, we provide an overview and discuss some of the most significant advances in our understanding of cortical expansion and folding over the last decades. These include discoveries in multiple and diverse disciplines, from cellular and molecular mechanisms regulating cortical development and neurogenesis, genetic mechanisms defining the patterns of cortical folds, the biomechanics of cortical growth and buckling, lessons from human disease, and how genetic evolution steered cortical size and folding during mammalian evolution.
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Affiliation(s)
- Virginia Fernández
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
| | - Cristina Llinares-Benadero
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
| | - Víctor Borrell
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
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Fernández V, Postigo M, Gonzalez A, Urbaneja P, León A, Alonso A, Guerrero M, Fernández O. ID 94 – Clinically isolated syndrome (CIS): Measure of axonal status. Clin Neurophysiol 2016. [DOI: 10.1016/j.clinph.2015.11.236] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Fernández V, Romero L, Muñoz T, López I, Giacometti S, Fernández O, Arraez M. ID 97 – Correlations between intraoperative microelectrode recording, microstimulation and macrostimulation with optimal post-operative programming of deep brain stimulation. Clin Neurophysiol 2016. [DOI: 10.1016/j.clinph.2015.11.340] [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: 10/22/2022]
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Casanova J, Pujol R, Ferrándiz C, Betlloch I, Bosch R, Fernández V, Martí R, Requena L, Moreno J, Alegre V, Vilata J, Vilar N, Jaén P, Bielsa I, Querol I, Azón T, Borrego L, Mascaró J, Alsina M, Díaz R, Suarez R, García-Bustinduy M, García-Patos V, Estrach T. Core Content for Undergraduate Medical Education in Spain: Recommendations of the Instructors’ Group of the Spanish Academy of Dermatology and Venereology (AEDV). Actas Dermo-Sifiliográficas (English Edition) 2016. [DOI: 10.1016/j.adengl.2015.09.025] [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: 10/22/2022] Open
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López-Soler C, Castro M, Daset L, Alcántara M, Fernández V, Prieto M, Puerto J. CONSECUENCIAS DEL MALTRATO GRAVE INTRAFAMILIAR EN LA INFANCIA: CONCEPTUALIZACIÓN Y DIAGNÓSTICO DE LAS REACCIONES POSTRAUMÁTICAS COMPLEJAS. CienciasPsi 2015. [DOI: 10.22235/cp.v0i2.643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
El trauma psíquico es una transversalidad en la historia de la humanidad, pero de diagnóstico tardío, especialmente en lo que refiere a su incorporación a los sistemas de clasificación en psicopatología como Trastorno por Estrés Postraumático (TEPT). Desde ese momento hasta nuestros días han ido en aumento los estudios sobre TEPT, avanzando primero en las formas de evaluación específica y posteriormente en las propuestas de intervención, con énfasis en población adulta. Otros trabajos han evidenciado que, la semiológica del TEPT en niños y adolescentes, no puede ser analizada y bordada de igual manera que en población adulta. En este artículo se presentan los resultados generales de estudios sobre el TEPT en la infancia y adolescencia y los trabajos sobre un Listado de apoyo a los Clínicos para la evaluación del TEPT y del TEPTC o DESNOS, con algunos de los resultados preliminares de los estudios realizados con población de menores en situación de abuso y maltrato.
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Casanova JM, Pujol RM, Ferrándiz C, Betlloch I, Bosch RJ, Fernández V, Martí RM, Requena L, Moreno JC, Alegre V, Vilata JJ, Vilar N, Jaén P, Bielsa I, Querol I, Azón T, Borrego L, Mascaró JM, Alsina M, Díaz RM, Suarez R, García-Bustinduy M, García-Patos V, Estrach T. Core Content for Undergraduate Medical Education in Spain: Recommendations of the Instructors' Group of the Spanish Academy of Dermatology and Venereology (AEDV). Actas Dermosifiliogr 2015; 107:125-32. [PMID: 26691244 DOI: 10.1016/j.ad.2015.09.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 09/30/2015] [Accepted: 09/30/2015] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Skin problems are among the most frequent reasons for seeking medical attention in primary care. In recent years, as a result of the process of adapting medical curricula to the requirements of the European Higher Education Area, the amount of time students spend learning the concepts of dermatology has been reduced in many universities. MATERIAL AND METHODS In order to reach a consensus on core content for undergraduate education in dermatology, we sent a survey to the 57 members of the instructors' group of the Spanish Academy of Dermatology and Venereology (AEDV), asking their opinions on what objectives should be set for a dermatology course in Spain. A total of 131 previously selected objectives were listed. We then applied the Delphi method to achieve consensus on which ones the respondents considered important or very important (score≥4 on a Likert scale). RESULTS Nineteen responses (33%) were received. On the second round of the Delphi process, 68 objectives achieved average scores of at least 4. The respondents emphasized that graduates should understand the structure and functions of the skin and know about bacterial, viral, and fungal skin infections, the most common sexually transmitted diseases (STDs), and the 4 main inflammatory dermatoses. Students should also learn about common complaints, such as itching and bald patches; the management of dermatologic emergencies; purpura and erythema nodosum as signs of internal disease; and the prevention of STDs and skin cancer. During clinical clerkships students should acquire the communication skills they will need to interview patients, write up a patient's medical history, and refer the patient to a specialist. CONCLUSIONS The AEDV's group of instructors have defined their recommendations on the core content that medical faculties should adopt for the undergraduate subject of dermatology in Spain.
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Affiliation(s)
| | - R M Pujol
- Universitat Autònoma de Barcelona, Barcelona, España
| | - C Ferrándiz
- Universitat Autònoma de Barcelona, Barcelona, España
| | - I Betlloch
- Universitad Miguel Hernández, Elche, Alicante, España
| | - R J Bosch
- Universitat de Málaga, Málaga, España
| | - V Fernández
- Universidad de Santiago de Compostela, Santiago de Compostela, España
| | - R M Martí
- Universitat de Lleida, Lleida, España
| | - L Requena
- Universidad Autónoma de Madrid, Madrid, España
| | | | - V Alegre
- Universidad de Valencia, Valencia, España
| | - J J Vilata
- Universidad de Valencia, Valencia, España
| | - N Vilar
- Universitat de Girona, Girona, España
| | - P Jaén
- Universidad de Alcalá de Henares, Madrid, España
| | - I Bielsa
- Universitat Autònoma de Barcelona, Barcelona, España
| | - I Querol
- Universidad de Zaragoza, Zaragoza, España
| | - T Azón
- Universitat Rovira i Virgili, Reus, Tarragona, España
| | - L Borrego
- Universidad de Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, España
| | | | - M Alsina
- Universitat de Barcelona, Barcelona, España
| | - R M Díaz
- Universidad Alfonso X el Sabio, Madrid, España
| | - R Suarez
- Universidad Complutense de Madrid, Madrid, España
| | | | | | - T Estrach
- Universitat de Barcelona, Barcelona, España
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Videla LA, Fernández V, Cornejo P, Vargas R, Carrasco J, Fernández J, Varela N. Causal role of oxidative stress in unfolded protein response development in the hyperthyroid state. Free Radic Biol Med 2015; 89:401-8. [PMID: 26434419 DOI: 10.1016/j.freeradbiomed.2015.09.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Revised: 09/09/2015] [Accepted: 09/11/2015] [Indexed: 02/07/2023]
Abstract
L-3,3',5-Triiodothyronine (T3)-induced liver oxidative stress underlies significant protein oxidation, which may trigger the unfolded protein response (UPR). Administration of daily doses of 0.1mg T3 for three consecutive days significantly increased the rectal temperature of rats and liver O2 consumption rate, with higher protein carbonyl and 8-isoprostane levels, glutathione depletion, and absence of morphological changes in liver parenchyma. Concomitantly, liver protein kinase RNA-like endoplasmic reticulum (ER) kinase and eukaryotic translation initiator factor 2α were phosphorylated in T3-treated rats compared to controls, with increased protein levels of binding immunoglobulin protein and activating transcription factor 4. In addition, higher mRNA levels of C/EBP homologous protein, growth arrest and DNA damage 34, protein disulfide isomerase, and ER oxidoreductin 1α were observed, changes that were suppressed by N-acetylcysteine (0.5 g/kg) given before each dose of T3. In conclusion, T3-induced liver oxidative stress involving higher protein oxidation status has a causal role in UPR development, a response that is aimed to alleviate ER stress and promote cell survival.
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Affiliation(s)
- Luis A Videla
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago-7, Chile.
| | - Virginia Fernández
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago-7, Chile
| | - Pamela Cornejo
- School of Medical Technology, Faculty of Health and Odontology, Diego Portales University, Santiago, Chile
| | - Romina Vargas
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago-7, Chile
| | - Juan Carrasco
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago-7, Chile
| | - Javier Fernández
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago-7, Chile
| | - Nelson Varela
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago-7, Chile; Department of Medical Technology, Faculty of Medicine, University of Chile, Santiago-7, Chile
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Fernández V, Estein S, Ortiz P, Luchessi P, Solana V, Solana H. A single amino acid substitution in isozyme GST mu in Triclabendazole resistant Fasciola hepatica (Sligo strain) can substantially influence the manifestation of anthelmintic resistance. Exp Parasitol 2015; 159:274-9. [PMID: 26542261 DOI: 10.1016/j.exppara.2015.10.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 08/25/2015] [Accepted: 10/29/2015] [Indexed: 10/22/2022]
Abstract
The helminth parasite Fasciola hepatica causes fascioliasis in human and domestic ruminants. Economic losses due to this infection are estimated in U$S 2000-3000 million yearly. The most common method of control is the use of anthelmintic drugs. However, there is an increased concern about the growing appearance of F. hepatica resistance to Triclabendazole (TCBZ), an anthelmintic with activity over adult and young flukes. F. hepatica has eight Glutathione S-Transferase (GST) isozymes, which are enzymes involved in the detoxification of a wide range of substrates through chemical conjugation with glutathione. In the present work we identified and characterized the GST mu gene isolated from the TCBZ-susceptible and TCBZ-resistant F. hepatica strains. Total RNA was transcribed into cDNA by reverse transcription and a 657 bp amplicon corresponding to the GST mu gene was obtained. The comparative genetic analysis of the GST mu gene of the TCBZ susceptible strain (Cullompton) and TCBZ resistant strain (Sligo) showed three nucleotide changes and one amino acid change at position 143 in the GST mu isozyme of the TCBZ-resistant strain. These results have potential relevance as they contribute better understand the mechanisms that generate resistance to anthelmintics.
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Affiliation(s)
- V Fernández
- Laboratorio de Biología Celular y Molecular, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, 7000 Tandil, Argentina.
| | - S Estein
- Laboratorio de Inmunología, Departamento SAMP, Centro de Investigación Veterinaria de Tandil (CIVETAN-CONICET), Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, 7000 Tandil, Argentina
| | - P Ortiz
- Laboratorio de Inmunología, Facultad de Ciencias Veterinarias, Universidad Nacional de Cajamarca, 06001 Cajamarca, Peru
| | - P Luchessi
- Laboratorio de Inmunología, Departamento SAMP, Centro de Investigación Veterinaria de Tandil (CIVETAN-CONICET), Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, 7000 Tandil, Argentina
| | - V Solana
- Laboratorio de Biología Celular y Molecular, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, 7000 Tandil, Argentina
| | - H Solana
- Laboratorio de Biología Celular y Molecular, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, 7000 Tandil, Argentina
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Moreno M, Fernández V, Monllau JM, Borrell V, Lerin C, de la Iglesia N. Transcriptional Profiling of Hypoxic Neural Stem Cells Identifies Calcineurin-NFATc4 Signaling as a Major Regulator of Neural Stem Cell Biology. Stem Cell Reports 2015; 5:157-65. [PMID: 26235896 PMCID: PMC4618660 DOI: 10.1016/j.stemcr.2015.06.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [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: 05/29/2014] [Revised: 06/29/2015] [Accepted: 06/29/2015] [Indexed: 01/09/2023] Open
Abstract
Neural stem cells (NSCs) reside in a hypoxic microenvironment within the brain. However, the crucial transcription factors (TFs) that regulate NSC biology under physiologic hypoxia are poorly understood. Here we have performed gene set enrichment analysis (GSEA) of microarray datasets from hypoxic versus normoxic NSCs with the aim of identifying pathways and TFs that are activated under oxygen concentrations mimicking normal brain tissue microenvironment. Integration of TF target (TFT) and pathway enrichment analysis identified the calcium-regulated TF NFATc4 as a major candidate to regulate hypoxic NSC functions. Nfatc4 expression was coordinately upregulated by top hypoxia-activated TFs, while NFATc4 target genes were enriched in hypoxic NSCs. Loss-of-function analyses further revealed that the calcineurin-NFATc4 signaling axis acts as a major regulator of NSC self-renewal and proliferation in vitro and in vivo by promoting the expression of TFs, including Id2, that contribute to the maintenance of the NSC state.
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Affiliation(s)
- Marta Moreno
- Clinical and Experimental Neurosciences, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain
| | - Virginia Fernández
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas and Universidad Miguel Hernández, 03550 Sant Joan d'Alacant, Spain
| | - Josep M Monllau
- Clinical and Experimental Neurosciences, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain
| | - Víctor Borrell
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas and Universidad Miguel Hernández, 03550 Sant Joan d'Alacant, Spain
| | - Carles Lerin
- Endocrinology, Hospital Sant Joan de Déu, 08950 Barcelona, Spain
| | - Núria de la Iglesia
- Clinical and Experimental Neurosciences, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain.
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Pedemonte JC, Vargas R, Castillo V, Hodali T, Gutiérrez S, Tapia G, Castillo I, Videla LA, Fernández V. A combined iron and thyroid hormone protocol suppresses ischemia–reperfusion injury in rat livers. RSC Adv 2015. [DOI: 10.1039/c4ra15863f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Liver preconditioning (PC) against ischemia–reperfusion (IR) injury is attained by iron (Fe) or thyroid hormone (T3) administration.
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Affiliation(s)
- J. C. Pedemonte
- Program of Molecular and Clinical Pharmacology
- Institute of Biomedical Sciences
- Faculty of Medicine
- University of Chile
- Santiago
| | - R. Vargas
- Program of Molecular and Clinical Pharmacology
- Institute of Biomedical Sciences
- Faculty of Medicine
- University of Chile
- Santiago
| | - V. Castillo
- Program of Molecular and Clinical Pharmacology
- Institute of Biomedical Sciences
- Faculty of Medicine
- University of Chile
- Santiago
| | - T. Hodali
- Program of Molecular and Clinical Pharmacology
- Institute of Biomedical Sciences
- Faculty of Medicine
- University of Chile
- Santiago
| | - S. Gutiérrez
- Program of Molecular and Clinical Pharmacology
- Institute of Biomedical Sciences
- Faculty of Medicine
- University of Chile
- Santiago
| | - G. Tapia
- Program of Molecular and Clinical Pharmacology
- Institute of Biomedical Sciences
- Faculty of Medicine
- University of Chile
- Santiago
| | - I. Castillo
- School of Medicine
- Faculty of Medicine
- Catholic University of Talca
- Chile
| | - L. A. Videla
- Program of Molecular and Clinical Pharmacology
- Institute of Biomedical Sciences
- Faculty of Medicine
- University of Chile
- Santiago
| | - V. Fernández
- Program of Molecular and Clinical Pharmacology
- Institute of Biomedical Sciences
- Faculty of Medicine
- University of Chile
- Santiago
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Fernández V, Ortiz P, Solana M, Solana H. Differential Activities of Glutathione S-Transferase Isoenzymes in Strains of Fasciola Hepatica Susceptible and Resistant to Triclabendazole. ACTA ACUST UNITED AC 2014. [DOI: 10.3844/ajavsp.2014.177.181] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Morales P, Vargas R, Videla LA, Fernández V. Nrf2 activation in the liver of rats subjected to a preconditioning sub-chronic iron protocol. Food Funct 2014; 5:243-50. [DOI: 10.1039/c3fo60265f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Fernández-Fígares M, Fernández V, Postigo MJ, Feron P. Acute paralysis after seafood ingestion. Neurophysiol Clin 2013; 43:299-302. [PMID: 24314756 DOI: 10.1016/j.neucli.2013.08.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Revised: 08/22/2013] [Accepted: 08/22/2013] [Indexed: 10/26/2022] Open
Abstract
The first European case of tetrodotoxin intoxication is reported in a patient who ingested a trumpet shellfish from the Atlantic Ocean in Southern Europe. He suffered general acute paralysis with respiratory failure necessitating ventilation. Early neurophysiologic studies showed complete peripheral nerve inexcitability, with no recordable sensory or motor responses, and normal electroencephalography. Tetrodotoxin was detected in high quantities in the patient's blood and urine through high performance liquid chromatography-mass spectrometry analysis. Seventy-two hours after admission the patient recovered normal strength, reflexes and sensation.
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Affiliation(s)
- M Fernández-Fígares
- Servicio de Neurofisiología Clínica, Hospital Regional Universitario Carlos Haya, Avda. Carlos Haya s/n, 29010 Málaga, España.
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Fernández V, Valls-Sole J, Relova J, Raguer N, Miralles F, Dinca L, Taramundi S, Costa-Frossard L, Ferrandiz M, Ramió-Torrentà L, Villoslada P, Saiz A, Calles C, Antigüedad A, Alvarez-Cermeño J, Prieto J, Izquierdo G, Montalbán X, Fernández O. Recommendations for the clinical use of motor evoked potentials in multiple sclerosis. Neurología (English Edition) 2013. [DOI: 10.1016/j.nrleng.2013.09.003] [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: 10/26/2022] Open
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Gascón N, Rodríguez V, Guardado S, Gómez S, Lechuga C, Martín M, Casado M, Hernández Ó, Fernández V, Pérez-regadera J. Malignant tumors of the central nervous system (CNS). Our experience. Rep Pract Oncol Radiother 2013. [DOI: 10.1016/j.rpor.2013.03.134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Valenzuela R, Espinosa A, González-Mañán D, D'Espessailles A, Fernández V, Videla LA, Tapia G. N-3 long-chain polyunsaturated fatty acid supplementation significantly reduces liver oxidative stress in high fat induced steatosis. PLoS One 2012; 7:e46400. [PMID: 23082120 PMCID: PMC3474802 DOI: 10.1371/journal.pone.0046400] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [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: 04/24/2012] [Accepted: 08/31/2012] [Indexed: 01/27/2023] Open
Abstract
Omega-3 (n-3) long-chain polyunsaturated fatty acids (n-3 LCPUFA) are associated with several physiological functions, suggesting that their administration may prevent non transmissible chronic diseases. Therefore, we investigate whether dietary n-3 LCPUFA supplementation triggers an antioxidant response preventing liver steatosis in mice fed a high fat diet (HFD) in relation to n-3 LCPUFA levels. Male C57BL/6J mice received (a) control diet (10% fat, 20% protein, 70% carbohydrate), (b) control diet plus n-3 LCPUFA (108 mg/kg/day eicosapentaenoic acid plus 92 mg/kg/day docosahexaenoic acid), (c) HFD (60% fat, 20% protein, 20% carbohydrate), or (d) HFD plus n-3 LCPUFA for 12 weeks. Parameters of liver steatosis, glutathione status, protein carbonylation, and fatty acid analysis were determined, concomitantly with insulin resistance and serum tumor necrosis factor-α (TNF-α), interleukin (IL)-1β, and IL-6 levels. HFD significantly increased total fat and triacylglyceride contents with macrovesicular steatosis, concomitantly with higher fasting serum glucose and insulin levels, HOMA, and serum TNF-α, IL-1β, and IL-6. Reduced and total liver glutathione contents were diminished by HFD, with higher GSSG/GSH ratio and protein carbonylation, n-3 LCPUFA depletion and elevated n-6/n-3 ratio over control values. These changes were either reduced or normalized to control values in animals subjected to HFD and n-3 LCPUFA, with significant increased hepatic total n-3 LCPUFA content and reduced n-6/n-3 ratio being observed after n-3 LCPUFA supplementation alone. So, repletion of liver n-3 LCPUFA levels by n-3 LCPUFA dietary supplementation in HFD obese mice reduces hepatic lipid content, with concomitant antioxidant and anti-inflammatory responses favouring insulin sensitivity.
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Affiliation(s)
- Rodrigo Valenzuela
- School of Nutrition and Dietetics, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Alejandra Espinosa
- School of Medical Technology, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Daniel González-Mañán
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Amanda D'Espessailles
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Virginia Fernández
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Luis A. Videla
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Gladys Tapia
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
- * E-mail:
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Videla LA, Fernández V, Cornejo P, Vargas R. Metabolic basis for thyroid hormone liver preconditioning: upregulation of AMP-activated protein kinase signaling. ScientificWorldJournal 2012; 2012:475675. [PMID: 22919323 PMCID: PMC3417194 DOI: 10.1100/2012/475675] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Accepted: 04/17/2012] [Indexed: 12/31/2022] Open
Abstract
The liver is a major organ responsible for most functions of cellular metabolism and a mediator between dietary and endogenous sources of energy for extrahepatic tissues. In this context, adenosine-monophosphate- (AMP-) activated protein kinase (AMPK) constitutes an intrahepatic energy sensor regulating physiological energy dynamics by limiting anabolism and stimulating catabolism, thus increasing ATP availability. This is achieved by mechanisms involving direct allosteric activation and reversible phosphorylation of AMPK, in response to signals such as energy status, serum insulin/glucagon ratio, nutritional stresses, pharmacological and natural compounds, and oxidative stress status. Reactive oxygen species (ROS) lead to cellular AMPK activation and downstream signaling under several experimental conditions. Thyroid hormone (L-3,3′,5-triiodothyronine, T3) administration, a condition that enhances liver ROS generation, triggers the redox upregulation of cytoprotective proteins affording preconditioning against ischemia-reperfusion (IR) liver injury. Data discussed in this work suggest that T3-induced liver activation of AMPK may be of importance in the promotion of metabolic processes favouring energy supply for the induction and operation of preconditioning mechanisms. These include antioxidant, antiapoptotic, and anti-inflammatory mechanisms, repair or resynthesis of altered biomolecules, induction of the homeostatic acute-phase response, and stimulation of liver cell proliferation, which are required to cope with the damaging processes set in by IR.
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Affiliation(s)
- Luis A Videla
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile.
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Fernández V, Tapia G, Videla LA. Recent advances in liver preconditioning: Thyroid hormone, n-3 long-chain polyunsaturated fatty acids and iron. World J Hepatol 2012; 4:119-28. [PMID: 22567184 PMCID: PMC3345536 DOI: 10.4254/wjh.v4.i4.119] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Revised: 11/08/2011] [Accepted: 04/24/2012] [Indexed: 02/06/2023] Open
Abstract
Liver preconditioning (PC), defined as an enhanced tolerance to injuring stimuli induced by previous specific maneuvers triggering beneficial functional and molecular changes, is of crucial importance in human liver transplantation and major hepatic resection. For these reasons, numerous PC strategies have been evaluated in experimental models of ischemia-reperfusion liver injury, which have not been transferred to clinical application due to side effects, toxicity and difficulties in implementation, with the exception of the controversial ischemic PC. In recent years, our group has undertaken the assessment of alternate experimental liver PC protocols that might have application in the clinical setting. These include thyroid hormone (T(3)), n-3 long-chain polyunsaturated fatty acids (n-3 LCPUFA), or iron, which suppressed liver damage due to the 1 h ischemia-20 h reperfusion protocol. T(3), n-3 LCPUFA and iron are hormetic agents that trigger biologically beneficial effects in the low-dose range, whose multifactorial mechanisms of action are discussed in the work.
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Affiliation(s)
- Virginia Fernández
- Virginia Fernández, Gladys Tapia, Luis A Videla, Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Casilla 70000, Santiago-7, Chile
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Cabezas L, Fernández V, Mazarro R, Gracia I, de Lucas A, Rodríguez J. Production of biodegradable porous scaffolds impregnated with indomethacin in supercritical CO2. J Supercrit Fluids 2012. [DOI: 10.1016/j.supflu.2011.12.002] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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García-Vicente F, Fernández V, Bermúdez R, Gómez A, Pérez L, Zapatero A, Torres JJ. Sensitivity of a helical diode array device to delivery errors in IMRT treatment and establishment of tolerance level for pretreatment QA. J Appl Clin Med Phys 2012; 13:3660. [PMID: 22231218 PMCID: PMC5716126 DOI: 10.1120/jacmp.v13i1.3660] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2011] [Revised: 09/07/2011] [Accepted: 09/20/2011] [Indexed: 11/23/2022] Open
Abstract
The aim of this study is to determine the gantry angle and multileaf collimator (MLC) gap error-detection threshold of a diode helical array with an inserted micro-ionization chamber in order to use this device for the pretreatment quality assurance (QA) of intensity-modulated radiation therapy (IMRT) treatments. Implications on the dose-volume histograms (DVHs) of the patient treatments will also be considered for the establishment of a QA protocol with a reasonable tolerance level. Three dynamic IMRT HN (head and neck) and prostate treatments were studied. Random and systematic variations of gantry angle and systematic errors in MLC gap width of the clinical treatments were analyzed in order to establish the detection sensitivity of the array. The associated clinical significance was studied introducing the same errors in the treatment plan based on the patients' computed tomography (CT) and calculating the corresponding DVHs. The Gamma (3%/3 mm) presented a 4% variation in failure rate for a rotation error of 1° for both types of treatment. Both systematic and random errors in gantry rotation angle have little effect on the patients' DVHs. MLC gap width errors of 1 mm and 2 mm in the prostate treatments imply a mean variation in isocenter-measured absorbed dose of 2.1% and 4.1%, respectively. In the case of HN, these errors entail a change in measured isocenter dose of 4.7% and 8.6%, respectively. The variation observed in the DVHs of the patients was, basically, a global displacement of the curves proportional to the isocenter dose variation caused by the gap width error. According to the array sensitivity to the analyzed errors and its implication in patient DVHs, a tolerance of 95% point passing rate for the gamma criterion 3%/2 mm and an agreement of 2% in isocenter absolute dose have been established as tolerance criteria for our pretreatment IMRT QA protocol.
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Affiliation(s)
- Feliciano García-Vicente
- Department of Radiation Oncology and Medical Physics, Hospital Universitario de La Princesa, Instituto de Investigación Sanitaria la Princesa, Madrid 28006, Spain.
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Zúñiga J, Cancino M, Medina F, Varela P, Vargas R, Tapia G, Videla LA, Fernández V. N-3 PUFA supplementation triggers PPAR-α activation and PPAR-α/NF-κB interaction: anti-inflammatory implications in liver ischemia-reperfusion injury. PLoS One 2011; 6:e28502. [PMID: 22174823 PMCID: PMC3234278 DOI: 10.1371/journal.pone.0028502] [Citation(s) in RCA: 149] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2011] [Accepted: 11/09/2011] [Indexed: 01/28/2023] Open
Abstract
Dietary supplementation with the n-3 polyunsaturated fatty acids (n-3 PUFA) eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) to rats preconditions the liver against ischemia-reperfusion (IR) injury, with reduction of the enhanced nuclear factor-κB (NF-κB) functionality occurring in the early phase of IR injury, and recovery of IR-induced pro-inflammatory cytokine response. The aim of the present study was to test the hypothesis that liver preconditioning by n-3 PUFA is exerted through peroxisone proliferator-activated receptor α (PPAR-α) activation and interference with NF-κB activation. For this purpose we evaluated the formation of PPAR-α/NF-κBp65 complexes in relation to changes in PPAR-α activation, IκB-α phosphorylation and serum levels and expression of interleukin (IL)-1β and tumor necrosis factor (TNF)-α in a model of hepatic IR-injury (1 h of ischemia and 20 h of reperfusion) or sham laparotomy (controls) in male Sprague Dawley rats. Animals were previously supplemented for 7 days with encapsulated fish oil (General Nutrition Corp., Pittsburg, PA) or isovolumetric amounts of saline (controls). Normalization of IR-altered parameters of liver injury (serum transaminases and liver morphology) was achieved by dietary n-3 PUFA supplementation. EPA and DHA suppression of the early IR-induced NF-κB activation was paralleled by generation of PPAR-α/NF-κBp65 complexes, in concomitance with normalization of the IR-induced IκB-α phosphorylation. PPAR-α activation by n-3 PUFA was evidenced by enhancement in the expression of the PPAR-α-regulated Acyl-CoA oxidase (Acox) and Carnitine-Palmitoyl-CoA transferase I (CPT-I) genes. Consistent with these findings, normalization of IR-induced expression and serum levels of NF-κB-controlled cytokines IL-lβ and TNF-α was observed at 20 h of reperfusion. Taken together, these findings point to an antagonistic effect of PPAR-α on NF-κB-controlled transcription of pro-inflammatory mediators. This effect is associated with the formation of PPAR-α/NF-κBp65 complexes and enhanced cytosolic IκB-α stability, as major preconditioning mechanisms induced by n-3 PUFA supplementation against IR liver injury.
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Affiliation(s)
- Jessica Zúñiga
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Milena Cancino
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Fernando Medina
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Patricia Varela
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Romina Vargas
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Gladys Tapia
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Luis A. Videla
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Virginia Fernández
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
- * E-mail:
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Mardones M, Valenzuela R, Romanque P, Covarrubias N, Anghileri F, Fernández V, Videla LA, Tapia G. Prevention of liver ischemia reperfusion injury by a combined thyroid hormone and fish oil protocol. J Nutr Biochem 2011; 23:1113-20. [PMID: 22137030 DOI: 10.1016/j.jnutbio.2011.06.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2011] [Revised: 05/31/2011] [Accepted: 06/16/2011] [Indexed: 10/14/2022]
Abstract
Several preconditioning strategies are used to prevent ischemia-reperfusion (IR) liver injury, a deleterious condition associated with tissue resection, transplantation or trauma. Although thyroid hormone (T₃) administration exerts significant protection against liver IR injury in the rat, its clinical application is controversial due to possible adverse effects. Considering that prevention of liver IR injury has also been achieved by n-3 polyunsaturated fatty acid (n-3 PUFA) supplementation to rats, we studied the effect of n-3 PUFA dietary supplementation plus a lower dose of T₃ against IR injury. Male Sprague-Dawley rats receiving fish oil (300 mg/kg) for 3 days followed by a single intraperitoneal dose of 0.05 mg T₃/kg were subjected to 1 h of ischemia followed by 20 h of reperfusion. Parameters of liver injury (serum transaminases, histology) and oxidative stress (liver contents of GSH and oxidized proteins) were correlated with fatty acid composition, NF-κB activity, and tumor necrosis factor-α (TNF-α) and haptoglobin expression. IR significantly modified liver histology; enhanced serum transaminases, TNF-α response or liver oxidative stress; and decreased liver NF-κB activity and haptoglobin expression. Although IR injury was not prevented by either n-3 PUFA supplementation or T₃ administration, substantial decrease in liver injury and oxidative stress was achieved by the combined protocol, which also led to increased liver n-3 PUFA content and decreased n-6/n-3 PUFA ratios, with recovery of NF-κB activity and TNF-α and haptoglobin expression. Prevention of liver IR injury achieved by a combined protocol of T₃ and n-3 PUFA supplementation may represent a novel noninvasive preconditioning strategy with potential clinical application.
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Affiliation(s)
- Marcelo Mardones
- Oxidative Stress and Hepatotoxicity Laboratory, Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Santiago 7, Chile
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Fernández O, Fernández V, Guerrero M, León A, López-Madrona JC, Alonso A, Bustamante R, Tamayo JA, Romero F, Bravo M, Luque G, García L, Sanchís G, Roman CS, Romero M, Papais-Alvarenga M, de Ramon E. Multiple sclerosis prevalence in Malaga, Southern Spain estimated by the capture–recapture method. Mult Scler 2011; 18:372-6. [DOI: 10.1177/1352458511421917] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Background: Although not definitively proven, there is commonly accepted to be a latitudinal gradient in the distribution of multiple sclerosis (MS), which is more frequent in temperate zones. The European Mediterranean countries are situated in a zone of median frequency, although ever increasing figures have been noted in the last decades. Objective: The objective of this study was to assess the current prevalence rate of MS in the province of Malaga, Southern Spain. Methods: The capture–recapture method (CRM) uses independent sources of data and permits the number of non-registered cases of a given disease to be estimated, and by doing so, to avoid ascertainment bias. Results: Use of this method showed the estimated prevalence rate of MS in the province of Malaga, Southern Spain, to be 125/105 (95% confidence interval: 102/105–169/105), higher than the figures published previously. Conclusions: Although we recognize that these data need to be confirmed in further studies and in other areas of the country using a similar method, we believe this study is the first to find such high figure of prevalence, being very similar to the figures reported in recent years in other southern European countries.
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Affiliation(s)
- O Fernández
- Institute of Clinical Neurosciences, Hospital Regional Universitario Carlos Haya, Spain
| | - V Fernández
- Institute of Clinical Neurosciences, Hospital Regional Universitario Carlos Haya, Spain
| | - M Guerrero
- Institute of Clinical Neurosciences, Hospital Regional Universitario Carlos Haya, Spain
| | - A León
- Institute of Clinical Neurosciences, Hospital Regional Universitario Carlos Haya, Spain
| | - JC López-Madrona
- Institute of Clinical Neurosciences, Hospital Regional Universitario Carlos Haya, Spain
| | - A Alonso
- Institute of Clinical Neurosciences, Hospital Regional Universitario Carlos Haya, Spain
| | - R Bustamante
- Institute of Clinical Neurosciences, Hospital Regional Universitario Carlos Haya, Spain
| | - JA Tamayo
- Institute of Clinical Neurosciences, Hospital Regional Universitario Carlos Haya, Spain
| | - F Romero
- Institute of Clinical Neurosciences, Hospital Regional Universitario Carlos Haya, Spain
| | - M Bravo
- Institute of Clinical Neurosciences, Hospital Regional Universitario Carlos Haya, Spain
| | - G Luque
- Institute of Clinical Neurosciences, Hospital Regional Universitario Carlos Haya, Spain
| | - L García
- Institute of Clinical Neurosciences, Hospital Regional Universitario Carlos Haya, Spain
| | - G Sanchís
- Internal Medicine Service, Hospital Comarcal Serranía de Ronda, Spain
| | - C San Roman
- Internal Medicine Service, Hospital Comarcal Vélez-Málaga, Spain
| | - M Romero
- Neurology Service, Hospital Clínico Universitario Virgen de la Victoria, Spain
| | - M Papais-Alvarenga
- Institute of Clinical Neurosciences, Hospital Regional Universitario Carlos Haya, Spain
| | - E de Ramon
- Institute of Clinical Neurosciences, Hospital Regional Universitario Carlos Haya, Spain
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Galleano M, Tapia G, Puntarulo S, Varela P, Videla LA, Fernández V. Liver preconditioning induced by iron in a rat model of ischemia/reperfusion. Life Sci 2011; 89:221-8. [PMID: 21699906 DOI: 10.1016/j.lfs.2011.06.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2010] [Revised: 04/29/2011] [Accepted: 05/26/2011] [Indexed: 01/26/2023]
Abstract
AIMS Liver preconditioning against ischemia-reperfusion (IR) injury is a major area of experimental research, in which regulation of gene expression with cytoprotective responses due to transient oxidative stress development has been reported. Considering that significant cytoprotection occurs after exposure to low levels of iron (Fe), we tested the hypothesis that sub-chronic administration of Fe to rats underlying transient oxidative stress preconditions the liver against IR injury. MAIN METHODS Animals received six doses (50 mg Fe-dextran/kg ip) every second day during 10 days, before partial IR (vascular clamping) or sham laparotomy (control). Transient oxidative stress was defined by liver glutathione and protein carbonyl contents (24, 48, and 72 h after Fe treatment). Plasma and liver Fe status and ferritin content (western blot) were assessed in animals not subjected to IR. Liver injury and inflammatory response were evaluated by serum transaminases, liver morphology and serum TNF-α. Fe preconditioning against IR injury was correlated with liver glutathione content and the redox-sensitive NF-κB signaling pathway (EMSA) and western blot analysis of haptoglobin. KEY FINDINGS Significant hepatoprotection against IR injury, underlying transient oxidative stress and enhancement in the total and labile Fe pools, was achieved by Fe administration. Abrogation of IR injury is related to reduced TNF-α response (91%), abolishment of the IR-induced liver glutathione depletion and recovery of the NF-κB signaling pathway (75%), lost during IR. SIGNIFICANCE Sub-chronic Fe administration protects the liver against IR injury through antioxidant and anti-inflammatory responses, with recovery of NF-κB activation and related acute-phase response signaling.
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Affiliation(s)
- Mónica Galleano
- Physical Chemistry-PRALIB, School of Pharmacy and Biochemistry, University of Buenos Aires-CONICET, Buenos Aires, Argentina
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Baptista T, Serrano A, Uzcátegui E, ElFakih Y, Rangel N, Carrizo E, Fernández V, Connell L, de Baptista EA, Quiroz S, Uzcátegui M, Rondón J, Matos Y, Uzcátegui L, Gómez R, Valery L, Novoa-Montero D. The metabolic syndrome and its constituting variables in atypical antipsychotic-treated subjects: comparison with other drug treatments, drug-free psychiatric patients, first-degree relatives and the general population in Venezuela. Schizophr Res 2011; 126:93-102. [PMID: 21071179 DOI: 10.1016/j.schres.2010.10.014] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2010] [Revised: 10/11/2010] [Accepted: 10/14/2010] [Indexed: 11/17/2022]
Abstract
BACKGROUND Few studies on the association between atypical antipsychotic drug (AAP) administration and metabolic dysfunction have concurrently evaluated the general population (GP), other psychotropic drug treatments and drug-free psychiatric patients. METHODS We assessed the frequency of the metabolic syndrome (MS) according to the National Cholesterol Education Program criteria (NCEP) and its constituting variables in a GP sample (n=271) and in patients receiving, for at least three consecutive months, antiepileptic drugs (n=93), olanzapine (n=162), clozapine (n=105), typical antipsychotics (n=117), other AAP (n=58), other psychotropic drugs (n=185), and drug-free individuals (n=636). Subjects were clinically classified as schizophrenia, bipolar or other axis I disorders (DSM-IV-RT), and as first-degree relatives of each diagnostic group. RESULTS The MS was detected in 26.6% of the GP (95% confidence interval: 21.5-31.8). No diagnostic or treatment group had a significantly higher age-adjusted frequency than the GP (p>0.05). Treatment duration did not significantly affect the results. However, significant differences were observed in the frequency of abnormal MS constituting variables in comparison to the GP. For example, schizophrenia patients and their relatives, bipolar subjects and olanzapine- and clozapine-treated patients had higher abnormal waist circumference values. In addition, bipolar patients and their relatives and subjects treated with olanzapine and other AAPs had higher frequencies of abnormal glucose levels. Neither schizophrenia nor bipolar patients in the diagnostic categories nor the olanzapine or the clozapine groups displayed higher proportions of abnormal triglycerides, high density cholesterol or blood pressure levels than the GP. CONCLUSIONS While we did not demonstrate an increased frequency of the MS in AAP-treated subjects, our results confirm that specific metabolic variables must be monitored in psychiatric patients. Besides they stress the importance, in epidemiological studies, of concurrently comparing the figures recorded in AAP-treated patients with those obtained in the local GP, other drug treatment groups and drug-free subjects when referring to the magnitude of the metabolic effects of specific antipsychotic agents.
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Affiliation(s)
- Trino Baptista
- Department of Physiology, Los Andes University Medical School, and San Juan de Dios Hospital, P.O. Box 93, Mérida, 5101-A, Venezuela.
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Zúñiga J, Venegas F, Villarreal M, Núñez D, Chandía M, Valenzuela R, Tapia G, Varela P, Videla LA, Fernández V. Protection against in vivo liver ischemia-reperfusion injury by n-3 long-chain polyunsaturated fatty acids in the rat. Free Radic Res 2011; 44:854-63. [PMID: 20528561 DOI: 10.3109/10715762.2010.485995] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
N-3 polyunsaturated fatty acids (n-3 PUFA) affect inflammatory processes. This study evaluated the effects of dietary supplementation with fish oil on hepatic ischemia-reperfusion (IR) injury in the rat. Parameters of liver injury (serum transaminases and histology) and oxidative stress (serum 8-isoprostanes and hepatic GSH and GSSG), were correlated with NF-kappaB DNA binding and FA composition and inflammatory cytokine release. N-3 PUFA supplementation significantly increased liver n-3 PUFA content and decreased n-6/n-3 PUFA ratios. IR significantly modified liver histology and enhanced serum transaminases, 8-isoprotanes and inflammatory cytokines, with net reduction in liver GSH levels and net increment in those of GSSG. Early increase (3 h) and late reduction (20 h) in NF-kappaB activity was induced. All IR-induced changes were normalized by n-3 PUFA supplementation. In conclusion, prevention of liver IR-injury was achieved by n-3 PUFA supplementation, with suppression of oxidative stress and recovery of pro-inflammatory cytokine homeostasis and NF-kappaB functionality lost during IR.
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Affiliation(s)
- Jessica Zúñiga
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, University of Chile, Santiago-7, Chile
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Fernández E, Carrizo E, Fernández V, Connell L, Sandia I, Prieto D, Mogollón J, Valbuena D, Fernández I, de Baptista EA, Baptista T. Polymorphisms of the LEP- and LEPR genes, metabolic profile after prolonged clozapine administration and response to the antidiabetic metformin. Schizophr Res 2010; 121:213-7. [PMID: 20591628 DOI: 10.1016/j.schres.2010.06.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2010] [Revised: 05/26/2010] [Accepted: 06/01/2010] [Indexed: 01/11/2023]
Abstract
BACKGROUND The role of leptin in atypical antipsychotic-induced metabolic dysfunction was explored by assessing the anthropometric and metabolic profile and the response to metformin (MET) of clozapine- (CLZ) treated schizophrenia patients according to their single nucleotide polymorphisms (SNPs) in the leptin promoter (LEP2548/GA) and leptin receptor (LEPR Q223R) genes. METHODS Phase 1. Body mass index (BMI), waist circumference, serum glucose, HbA1C, lipids, leptin, cortisol, insulin resistance index (HOMA-IR), metabolic syndrome and the frequencies of SNPs were assessed in 56 CLZ-treated patients (78.6% males). Phase 2. Fifty two phase 1 subjects were randomly assigned to MET XR (n=23) (1000 mg/day) or placebo (n=29) for 14 weeks. Changes in anthropometric and biochemical variables were compared between the SNPs. RESULTS Phase 1. The QQ group displayed the lowest triglyceride levels (p<0.05). No other significant difference was observed. Phase 2. Change in anthropometric variables did not differ between the genotypes in any treatment group. After MET, glucose levels significantly increased in the GG group (p<0.05), whereas the HOMA-IR and the low density cholesterol significantly decreased in the QQ- but not in the (QR+RR) group (p<0.05). No differences were observed after placebo. CONCLUSIONS BW response to CLZ was not related to LEP- and LEPR-SNPs. The GG and (QR+RR) genotypes showed an unexpectedly opposite and blunted response to MET administration respectively.
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Affiliation(s)
- Erika Fernández
- Institute of Clinical Research Dr. Américo Negrette, Zulia University Medical School, Maracaibo, Venezuela
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