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Salgueiro M, Camporeale G, Visentin A, Aran M, Pellizza L, Esperante SA, Corbat A, Grecco H, Sousa B, Esperón R, Borkosky SS, de Prat-Gay G. Molten Globule Driven and Self-downmodulated Phase Separation of a Viral Factory Scaffold. J Mol Biol 2023; 435:168153. [PMID: 37210029 DOI: 10.1016/j.jmb.2023.168153] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 05/09/2023] [Accepted: 05/12/2023] [Indexed: 05/22/2023]
Abstract
Viral factories of liquid-like nature serve as sites for transcription and replication in most viruses. The respiratory syncytial virus factories include replication proteins, brought together by the phosphoprotein (P) RNA polymerase cofactor, present across non-segmented negative stranded RNA viruses. Homotypic liquid-liquid phase separation of RSV-P is governed by an α-helical molten globule domain, and strongly self-downmodulated by adjacent sequences. Condensation of P with the nucleoprotein N is stoichiometrically tuned, defining aggregate-droplet and droplet-dissolution boundaries. Time course analysis show small N-P nuclei gradually coalescing into large granules in transfected cells. This behavior is recapitulated in infection, with small puncta evolving to large viral factories, strongly suggesting that P-N nucleation-condensation sequentially drives viral factories. Thus, the tendency of P to undergo phase separation is moderate and latent in the full-length protein but unleashed in the presence of N or when neighboring disordered sequences are deleted. This, together with its capacity to rescue nucleoprotein-RNA aggregates suggests a role as a "solvent-protein".
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Affiliation(s)
- Mariano Salgueiro
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) CONICET, Buenos Aires, Argentina
| | - Gabriela Camporeale
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) CONICET, Buenos Aires, Argentina
| | - Araceli Visentin
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) CONICET, Buenos Aires, Argentina
| | - Martin Aran
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) CONICET, Buenos Aires, Argentina
| | - Leonardo Pellizza
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) CONICET, Buenos Aires, Argentina
| | | | - Agustín Corbat
- Facultad de Ciencias Exactas y Naturales (FCEN), Universidad de Buenos Aires, and IFIBA, CONICET, Buenos Aires, Argentina
| | - Hernán Grecco
- Facultad de Ciencias Exactas y Naturales (FCEN), Universidad de Buenos Aires, and IFIBA, CONICET, Buenos Aires, Argentina
| | - Belén Sousa
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) CONICET, Buenos Aires, Argentina
| | - Ramiro Esperón
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) CONICET, Buenos Aires, Argentina
| | - Silvia S Borkosky
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) CONICET, Buenos Aires, Argentina
| | - Gonzalo de Prat-Gay
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) CONICET, Buenos Aires, Argentina.
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Borkosky SS, Fassolari M, Campos-León K, Rossi AH, Salgueiro M, Pascuale CA, Martínez RP, Gaston K, de Prat Gay G. Biomolecular Condensation of the Human Papillomavirus E2 Master Regulator with p53: Implications in Viral Replication. J Mol Biol 2023; 435:167889. [PMID: 36402224 DOI: 10.1016/j.jmb.2022.167889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 10/21/2022] [Accepted: 11/07/2022] [Indexed: 11/18/2022]
Abstract
p53 exerts its tumour suppressor activity by modulating hundreds of genes and it can also repress viral replication. Such is the case of human papillomavirus (HPV) through targeting the E2 master regulator, but the biochemical mechanism is not known. We show that the C-terminal DNA binding domain of HPV16 E2 protein (E2C) triggers heterotypic condensation with p53 at a precise 2/1 E2C/p53 stoichiometry at the onset for demixing, yielding large regular spherical droplets that increase in size with E2C concentration. Interestingly, transfection experiments show that E2 co-localizes with p53 in the nucleus with a grainy pattern, and recruits p53 to chromatin-associated foci, a function independent of the DNA binding capacity of p53 as judged by a DNA binding impaired mutant. Depending on the length, DNA can either completely dissolve or reshape heterotypic droplets into irregular condensates containing p53, E2C, and DNA, and reminiscent of that observed linked to chromatin. We propose that p53 is a scaffold for condensation in line with its structural and functional features, in particular as a promiscuous hub that binds multiple cellular proteins. E2 appears as both client and modulator, likely based on its homodimeric DNA binding nature. Our results, in line with the known role of condensation in eukaryotic gene enhancement and silencing, point at biomolecular condensation of E2 with p53 as a means to modulate HPV gene function, strictly dependent on host cell replication and transcription machinery.
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Affiliation(s)
- Silvia Susana Borkosky
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) - CONICET, Av. Patricias Argentinas 435, 1405 Buenos Aires, Argentina.
| | - Marisol Fassolari
- Fundación para Investigaciones Biológicas Aplicadas (FIBA), Instituto de Investigaciones en Biodiversidad y Biotecnología (INBIOTEC)-CONICET, Mar del Plata, Argentina
| | - Karen Campos-León
- Division of Immunity and Infection, School of Medicine, University of Birmingham, United Kingdom
| | - Andrés Hugo Rossi
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) - CONICET, Av. Patricias Argentinas 435, 1405 Buenos Aires, Argentina
| | - Mariano Salgueiro
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) - CONICET, Av. Patricias Argentinas 435, 1405 Buenos Aires, Argentina
| | - Carla Antonela Pascuale
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) - CONICET, Av. Patricias Argentinas 435, 1405 Buenos Aires, Argentina
| | - Ramón Peralta Martínez
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) - CONICET, Av. Patricias Argentinas 435, 1405 Buenos Aires, Argentina
| | - Kevin Gaston
- School of Medicine, University of Nottingham Biodiscovery Institute, Nottingham, United Kingdom
| | - Gonzalo de Prat Gay
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) - CONICET, Av. Patricias Argentinas 435, 1405 Buenos Aires, Argentina.
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Visentin A, Demitroff N, Salgueiro M, Borkosky SS, Uversky VN, Camporeale G, de Prat-Gay G. Assembly of the Tripartite and RNA Condensates of the Respiratory Syncytial Virus Factory Proteins In Vitro: Role of the Transcription Antiterminator M 2-1. Viruses 2023; 15:1329. [PMID: 37376628 DOI: 10.3390/v15061329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 06/01/2023] [Accepted: 06/02/2023] [Indexed: 06/29/2023] Open
Abstract
A wide variety of viruses replicate in liquid-like viral factories. Non-segmented negative stranded RNA viruses share a nucleoprotein (N) and a phosphoprotein (P) that together emerge as the main drivers of liquid-liquid phase separation. The respiratory syncytial virus includes the transcription antiterminator M2-1, which binds RNA and maximizes RNA transcriptase processivity. We recapitulate the assembly mechanism of condensates of the three proteins and the role played by RNA. M2-1 displays a strong propensity for condensation by itself and with RNA through the formation of electrostatically driven protein-RNA coacervates based on the amphiphilic behavior of M2-1 and finely tuned by stoichiometry. M2-1 incorporates into tripartite condensates with N and P, modulating their size through an interplay with P, where M2-1 is both client and modulator. RNA is incorporated into the tripartite condensates adopting a heterogeneous distribution, reminiscent of the M2-1-RNA IBAG granules within the viral factories. Ionic strength dependence indicates that M2-1 behaves differently in the protein phase as opposed to the protein-RNA phase, in line with the subcompartmentalization observed in viral factories. This work dissects the biochemical grounds for the formation and fate of the RSV condensates in vitro and provides clues to interrogate the mechanism under the highly complex infection context.
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Affiliation(s)
- Araceli Visentin
- Instituto Leloir, IIB-BA Conicet, Av. Patricias Argentinas 435, Buenos Aires 1405, Argentina
| | - Nicolás Demitroff
- Instituto Leloir, IIB-BA Conicet, Av. Patricias Argentinas 435, Buenos Aires 1405, Argentina
| | - Mariano Salgueiro
- Instituto Leloir, IIB-BA Conicet, Av. Patricias Argentinas 435, Buenos Aires 1405, Argentina
| | - Silvia Susana Borkosky
- Instituto Leloir, IIB-BA Conicet, Av. Patricias Argentinas 435, Buenos Aires 1405, Argentina
| | - Vladimir N Uversky
- Department of Molecular Medicine and USF Health Byrd Alzheimer's Research Institute, Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA
| | - Gabriela Camporeale
- Instituto Leloir, IIB-BA Conicet, Av. Patricias Argentinas 435, Buenos Aires 1405, Argentina
| | - Gonzalo de Prat-Gay
- Instituto Leloir, IIB-BA Conicet, Av. Patricias Argentinas 435, Buenos Aires 1405, Argentina
- Brazilian Biosciences National Laboratory, Brazilian Center for Research in Energy and Materials (CNPEM), Campinas 13083-970, SP, Brazil
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Esperante S, Alvarez-Paggi D, Salgueiro M, Desimone M, de Oliveira G, Arán M, García-Pardo J, Aptekmann A, Ventura S, Alonso L, de Prat-Gay G. A finely tuned interplay between calcium binding, ionic strength and pH modulates conformational and oligomerization equilibria in the Respiratory Syncytial Virus Matrix (M) protein. Arch Biochem Biophys 2022; 731:109424. [DOI: 10.1016/j.abb.2022.109424] [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: 06/30/2022] [Revised: 09/14/2022] [Accepted: 09/29/2022] [Indexed: 11/30/2022]
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Alvarez Paggi D, Esperante SA, Salgueiro M, Camporeale G, de Oliveira GAP, Prat Gay G. A conformational switch balances viral RNA accessibility and protection in a nucleocapsid ring model. Arch Biochem Biophys 2019; 671:77-86. [PMID: 31229488 DOI: 10.1016/j.abb.2019.06.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 05/30/2019] [Accepted: 06/19/2019] [Indexed: 12/22/2022]
Abstract
Virus from the Mononegavirales order share common features ranging from virion structure arrangement to mechanisms of replication and transcription. One of them is the way the nucleoprotein (N) wraps and protects the RNA genome from degradation by forming a highly ordered helical nucleocapsid. However, crystal structures from numerous Mononegavirales reveal that binding to the nucleoprotein results in occluded nucleotides that hinder base pairing necessary for transcription and replication. This hints at the existence of alternative conformations of the N protein that would impact on the protein-RNA interface, allowing for transient exposure of the nucleotides without complete RNA release. Moreover, the regulation between the alternative conformations should be finely tuned. Recombinant expression of N from the respiratory syncytial virus form regular N/RNA common among all Mononegavirales, and these constitute an ideal minimal unit for investigating the mechanisms through which these structures protect RNA so efficiently while allowing for partial accessibility during transcription and replication. Neither pH nor high ionic strength could dissociate the RNA but led to irreversible aggregation of the nucleoprotein. Low concentrations of guanidine chloride dissociated the RNA moiety but leading to irreversible aggregation of the protein moiety. On the other hand, high concentrations of urea and long incubation periods were required to remove bound RNA. Both denaturants eventually led to unfolding but converged in the formation of an RNA-free β-enriched intermediate species that remained decameric even at high denaturant concentrations. Although the N-RNA rings interact with the phosphoprotein P, the scaffold of the RNA polymerase complex, this interaction did not lead to RNA dissociation from the rings in vitro. Thus, we have uncovered complex equilibria involving changes in secondary structure of N and RNA loosening, processes that must take place in the context of RNA transcription and replication, whose detailed mechanisms and cellular and viral participants need to be established.
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Affiliation(s)
- D Alvarez Paggi
- Protein Structure-Function and Engineering Laboratory, Fundación Instituto Leloir and IIBBA-CONICET, Argentina.
| | - S A Esperante
- Protein Structure-Function and Engineering Laboratory, Fundación Instituto Leloir and IIBBA-CONICET, Argentina
| | - M Salgueiro
- Protein Structure-Function and Engineering Laboratory, Fundación Instituto Leloir and IIBBA-CONICET, Argentina
| | - G Camporeale
- Protein Structure-Function and Engineering Laboratory, Fundación Instituto Leloir and IIBBA-CONICET, Argentina
| | - G A P de Oliveira
- Programa de Biologia Estrutural, Instituto de Bioquímica Médica Leopoldo de Meis, Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Centro Nacional de Ressonância Magnêtica Nuclear Jiri Jonas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil and Department of Biochemistry and Molecular Genetics, University of Virginia, Charlottesville, VA, 22908-0733, USA
| | - G Prat Gay
- Protein Structure-Function and Engineering Laboratory, Fundación Instituto Leloir and IIBBA-CONICET, Argentina.
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Esperante SA, Alvarez-Paggi D, Salgueiro M, Prat Gay GD. Mechanism of Tetramer Dissociation, Unfolding, and Oligomer Assembly of Pneumovirus M2-1 Transcription Antiterminators. ACS Omega 2018; 3:14732-14745. [PMID: 30555987 PMCID: PMC6289497 DOI: 10.1021/acsomega.8b01600] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 10/17/2018] [Indexed: 06/09/2023]
Abstract
Among Mononegavirales, the Pneumovirus family stands out by its RNA polymerase processivity that relies on a transcription antiterminator, the M2-1 protein, which also plays a key role in viral particle assembly. Biophysical and structural evidence shows that this RNA-binding tetramer is strongly modulated by a CCCH Zn2+ binding motif. We show that while the global dissociation/unfolding free energy is 10 kcal mol-1, more stable for the respiratory syncytial virus M2-1, the human metapneumovirus (HMPV) counterpart shows a 7 kcal mol-1 higher intersubunit affinity. Removal of Zn2+ from both homologues leads to an apo-monomer of identical secondary structure that further undergoes a slow irreversible oligomerization. Mutation of the histidine residue of the Zn2+ motif to cysteine or alanine leads directly to large oligomers, strongly suggesting that metal coordination has an exquisite precision for modulating the quaternary arrangement. Zn2+ removal is very slow and requires subdenaturing concentrations of guanidine chloride, suggesting a likely local folding energy barrier. Exploring a broad combination of denaturant and ethylenediaminetetraacetic acid conditions, we showed that the metapneumovirus protein has to overcome a higher energy barrier to trigger Zn2+ removal-driven dissociation, in concordance with a slower dissociation kinetics. In silico modeling of open and close conformations for both M2-1 tetramers together with interaction energy calculations reveals that the gradual opening of protomers decreases the number of intersubunit contacts. Half of the interaction energy holding each protomer in the tetramer comes from the CCCH motif, while HMPV-M2-1 harbors additional contacts between the CCCH motif of one subunit and the core domain of a protomer located in trans, allowing the rationalization of the experimental data obtained. Overall, the evidence points at a key role of the CCCH motif in switching between structural and consequently functional alternatives of the M2-1 protein.
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Molina IG, Josts I, Almeida Hernandez Y, Esperante S, Salgueiro M, Garcia Alai MM, de Prat-Gay G, Tidow H. Structure and stability of the Human respiratory syncytial virus M 2-1 RNA-binding core domain reveals a compact and cooperative folding unit. Acta Crystallogr F Struct Biol Commun 2018; 74:23-30. [PMID: 29372904 PMCID: PMC5947689 DOI: 10.1107/s2053230x17017381] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Accepted: 12/04/2017] [Indexed: 11/10/2022] Open
Abstract
Human syncytial respiratory virus is a nonsegmented negative-strand RNA virus with serious implications for respiratory disease in infants, and has recently been reclassified into a new family, Pneumoviridae. One of the main reasons for this classification is the unique presence of a transcriptional antiterminator, called M2-1. The puzzling mechanism of action of M2-1, which is a rarity among antiterminators in viruses and is part of the RNA polymerase complex, relies on dissecting the structure and function of this multidomain tetramer. The RNA-binding activity is located in a monomeric globular `core' domain, a high-resolution crystal structure of which is now presented. The structure reveals a compact domain which is superimposable on the full-length M2-1 tetramer, with additional electron density for the C-terminal tail that was not observed in the previous models. Moreover, its folding stability was determined through chemical denaturation, which shows that the secondary and tertiary structure unfold concomitantly, which is indicative of a two-state equilibrium. These results constitute a further step in the understanding of this unique RNA-binding domain, for which there is no sequence or structural counterpart outside this virus family, in addition to its implications in transcription regulation and its likeliness as an antiviral target.
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Affiliation(s)
- Ivana G. Molina
- Protein Structure–Function and Engineering Laboratory, Fundación Instituto Leloir and IIBBA–CONICET, Avenida Patricias Argentinas 435, C1405BWE Buenos Aires, Argentina
| | - Inokentijs Josts
- The Hamburg Centre for Ultrafast Imaging and Department of Chemistry, Institute for Biochemistry and Molecular Biology, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
| | - Yasser Almeida Hernandez
- The Hamburg Centre for Ultrafast Imaging and Department of Chemistry, Institute for Biochemistry and Molecular Biology, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
| | - Sebastian Esperante
- Protein Structure–Function and Engineering Laboratory, Fundación Instituto Leloir and IIBBA–CONICET, Avenida Patricias Argentinas 435, C1405BWE Buenos Aires, Argentina
| | - Mariano Salgueiro
- Protein Structure–Function and Engineering Laboratory, Fundación Instituto Leloir and IIBBA–CONICET, Avenida Patricias Argentinas 435, C1405BWE Buenos Aires, Argentina
| | - Maria M. Garcia Alai
- European Molecular Biology Laboratory (EMBL), Hamburg Unit, Notkestrasse 85, 22607 Hamburg, Germany
| | - Gonzalo de Prat-Gay
- Protein Structure–Function and Engineering Laboratory, Fundación Instituto Leloir and IIBBA–CONICET, Avenida Patricias Argentinas 435, C1405BWE Buenos Aires, Argentina
| | - Henning Tidow
- The Hamburg Centre for Ultrafast Imaging and Department of Chemistry, Institute for Biochemistry and Molecular Biology, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
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Lufrano D, Trejo SA, Llovera RE, Salgueiro M, Fernandez G, Martínez Damonte V, González Flecha FL, Raingo J, Ermácora MR, Perelló M. Ghrelin binding to serum albumin and its biological impact. Mol Cell Endocrinol 2016; 436:130-40. [PMID: 27431015 DOI: 10.1016/j.mce.2016.07.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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: 03/31/2016] [Revised: 06/08/2016] [Accepted: 07/14/2016] [Indexed: 01/07/2023]
Abstract
Ghrelin is an octanoylated peptide hormone that plays a key role in the regulation of the body weight and glucose homeostasis. In plasma, ghrelin circulates bound to larger proteins whose identities are partially established. Here, we used size exclusion chromatography, mass spectrometry and isothermal titration microcalorimetry to show that ghrelin interacts with serum albumin. Furthermore, we found that such interaction displays an estimated dissociation constant (KD) in the micromolar range and involves albumin fatty-acid binding sites as well as the octanoyl moiety of ghrelin. Notably, albumin-ghrelin interaction reduces the spontaneous deacylation of the hormone. Both in vitro experiments-assessing ghrelin ability to inhibit calcium channels-and in vivo studies-evaluating ghrelin orexigenic effects-indicate that the binding to albumin affects the bioactivity of the hormone. In conclusion, our results suggest that ghrelin binds to serum albumin and that this interaction impacts on the biological activity of the hormone.
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Affiliation(s)
- Daniela Lufrano
- Instituto Multidisciplinario de Biología Celular, Conicet, Argentina
| | - Sebastián A Trejo
- Instituto Multidisciplinario de Biología Celular, Conicet, Argentina; Servei de Proteòmica i Biologia Estructural, Universitat Autònoma de Barcelona, Spain
| | - Ramiro E Llovera
- Instituto Multidisciplinario de Biología Celular, Conicet, Argentina
| | - Mariano Salgueiro
- Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Argentina
| | - Gimena Fernandez
- Instituto Multidisciplinario de Biología Celular, Conicet, Argentina
| | | | - F Luis González Flecha
- Instituto de Química y Fisicoquímica Biológicas, Departamento de Química Biológica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Argentina
| | - Jesica Raingo
- Instituto Multidisciplinario de Biología Celular, Conicet, Argentina
| | - Mario R Ermácora
- Instituto Multidisciplinario de Biología Celular, Conicet, Argentina; Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Argentina
| | - Mario Perelló
- Instituto Multidisciplinario de Biología Celular, Conicet, Argentina.
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Nettles M, Pishgou M, Solares C, Brown J, Salgueiro M, Byrd J, Groves M, Shaaban S, Reyes S, Ciarrocca K, Mott F, Postma G, DeRossi S, Kountakis S, Mourad W, Rabatic B. Head and Neck Lymphedema: Reducing a Growing Problem. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.1899] [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: 11/25/2022]
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Rabatic B, Zaenger D, Marascio J, Madden N, Ciarrocca K, DeRossi S, Amoush A, Shaaban S, Al-Basheer A, Huang K, Solares C, Byrd J, Groves M, Brown J, Salgueiro M, Pishgou M, Marchan E, Mott F, Ferguson C, Mourad W. Quantitative Dose Changes Due to Anatomic and Volumetric Changes of the Parotid Glands During Concurrent Head and Neck Therapy. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.2312] [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: 11/17/2022]
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Silva AM, Descalço A, Salgueiro M, Pereira L, Barreto C, Bandeira T, Ferreira R. Respiratory sleep disturbance in children and adolescents with cystic fibrosis. Rev Port Pneumol (2006) 2016; 22:202-8. [PMID: 27052354 DOI: 10.1016/j.rppnen.2016.02.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Revised: 12/22/2015] [Accepted: 02/06/2016] [Indexed: 12/23/2022] Open
Abstract
UNLABELLED Sleep disturbance has been described in cystic fibrosis (CF) patients as relevant to clinical and lung function predictive factors helping to improve the diagnosis and early intervention. Related paediatric studies are scarce. OBJECTIVE To describe respiratory sleep disturbance (RSD) and its association with spirometric indices in a population of CF children. A second aim was to determine if spirometric indices and wake-time SpO2 are predictors of sleep disturbance. METHODS A cross-sectional study involving 33CF paediatric patients. All participants underwent in-lab polysomnography (PSG), pulse oximetry and spirometry. A standardized sleep questionnaire was completed for each patient. Two subgroups were considered: I - Normal (FEV1>-1.64 z-score); II - Obstructed (FEV1≤-1.64 z-score). RESULTS Participant's median age was 12 (6-18) years, 16 (48.5%) were male. Twenty-nine patients (87.9%) presented sleep complaints. Sleep efficiency was reduced; sleep latency and waking after sleep onset (WASO) increased. N1 increased, N2, N3, REM and awakenings were normal. The apnoea-hypopnoea index was 0.6/h (sd 0.9); respiratory disturbance index (RDI) was 6.6/h (sd 5.2). Mean awaking (97% (sd 1.1)) and sleep SpO2 (95% (sd 2.7)) were normal; mean nocturnal oximetry desaturation index was 2.36/h; minimal nocturnal SpO2 was 89% (sd 4.1). We found associations between mean nocturnal SPO2 and mean values of FEV1 (r=0.528; p=0.002) and FEF25-75 (r=0.426; p=0.013). There were significant differences in nocturnal SpO2 between normal and obstructed patients (p<0.000). PSG data correlated with the questionnaire answers for night awakenings and WASO (p=0.985) and difficult breathing during sleep and RDI (p=0.722). This study points to most CF children having sleep complaints, and highlights the correlation between subjective assessment of sleep and PSG and spirometric results. Awake-time SpO2 and spirometric values are possible risk predictors for nocturnal desaturation.
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Affiliation(s)
- A M Silva
- Pediatric Lung Function and Sleep Laboratory, Hospital de Santa Maria, CHLN, Lisbon Academic Medical Center, Portugal.
| | - A Descalço
- Pediatric Lung Function and Sleep Laboratory, Hospital de Santa Maria, CHLN, Lisbon Academic Medical Center, Portugal.
| | - M Salgueiro
- Pediatric Lung Function and Sleep Laboratory, Hospital de Santa Maria, CHLN, Lisbon Academic Medical Center, Portugal.
| | - L Pereira
- Respiratory Unit, Department of Pediatrics, Hospital de Santa Maria, CHLN, Lisbon Academic Medical Center, Portugal.
| | - C Barreto
- Department of Pediatrics, Hospital de Santa Maria, CHLN, Lisbon Academic Medical Center, Portugal.
| | - T Bandeira
- Pediatric Lung Function and Sleep Laboratory, Hospital de Santa Maria, CHLN, Lisbon Academic Medical Center, Portugal; Respiratory Unit, Department of Pediatrics, Hospital de Santa Maria, CHLN, Lisbon Academic Medical Center, Portugal.
| | - R Ferreira
- Pediatric Lung Function and Sleep Laboratory, Hospital de Santa Maria, CHLN, Lisbon Academic Medical Center, Portugal; Respiratory Unit, Department of Pediatrics, Hospital de Santa Maria, CHLN, Lisbon Academic Medical Center, Portugal.
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Silva A, Salgueiro M, Descalço A, Pereira L, Barreto C, Ferreira R. 137 Sleep disturbances in CF children: looking for severity predictors. J Cyst Fibros 2014. [DOI: 10.1016/s1569-1993(14)60273-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Marcos S, Hervás A, Salgueiro M, Abondano A, Ordoñez D, Domínguez J, Royuela A, Fernández E, Botella S, Martínez J, Ramos A. Hypofractionated radiotherapy in rectal cancer. Rep Pract Oncol Radiother 2013. [DOI: 10.1016/j.rpor.2013.03.203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Ordoñez D, Salgueiro M, Hervás A, Abondano A, Domínguez J, Marcos S, Vallejo M, Martínez J, Royuela A, Ramos A. Conservative treatment in locally advanced oral cavity cancer. Rep Pract Oncol Radiother 2013. [DOI: 10.1016/j.rpor.2013.03.258] [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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Montero A, Hernanz R, Caballero P, Capuz A, Marcos S, Abondano A, Salgueiro M, Polo A, Fernández-lizarbe E, Ordóñez D, Domínguez J, Ramos A. Low-dose radiotherapy in the conservative treatment of degenerative painful osteoarthritis. Rep Pract Oncol Radiother 2013. [DOI: 10.1016/j.rpor.2013.03.383] [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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16
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Salgueiro M, Abondano A, Hervás A, Domínguez J, Ordoñez D, Marcos S, Vallejo M, Martínez J, Royuela A, Ramos A. Conservative treatment in locally advanced hypopharynx cancer. Rep Pract Oncol Radiother 2013. [DOI: 10.1016/j.rpor.2013.03.256] [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: 11/29/2022] Open
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Hervás A, Vallejo C, Abondano A, Salgueiro M, Domínguez J, Ordoñez D, Martínez J, Royuela A, Ramos A. Conservative treatment in locally advanced head and neck cancer. Rep Pract Oncol Radiother 2013. [DOI: 10.1016/j.rpor.2013.03.754] [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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Silva A, Constant C, Salgueiro M, Descalço A, Pereira L, Bandeira T, Ferreira R. 189 Nocturnal pulse oximetry in paediatric cystic fibrosis patients. Is FEV1 a good predictor? J Cyst Fibros 2013. [DOI: 10.1016/s1569-1993(13)60330-6] [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: 11/26/2022]
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Marcos S, Hernanz R, Fernandez E, Abondano A, Salgueiro M, Ordoñez D, Dominguez J, Ramos A. Combined treatment of malignant gliomas. A single center experience. Rep Pract Oncol Radiother 2013. [DOI: 10.1016/j.rpor.2013.03.125] [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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Polo A, Montero A, Salgueiro M, Colmenares R, Abondano A, Candela A, Hervás A, Ramos A. Interstitial HDR brachytherapy for oral tongue cancer: Educational video. Rep Pract Oncol Radiother 2013. [DOI: 10.1016/j.rpor.2013.03.663] [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: 11/26/2022] Open
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21
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Abondano A, Salgueiro M, Hervás A, Ordoñez D, Domínguez J, Marcos S, Vallejo M, Martínez J, Royuela A, Ramos A. Conservative treatment in locally advanced oropharynx cancer. Rep Pract Oncol Radiother 2013. [DOI: 10.1016/j.rpor.2013.03.259] [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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22
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Domínguez J, Abondano A, Hervás A, Vallejo M, Salgueiro M, Marcos S, Ordoñez D, Martínez J, Royuela A, Ramos A. Conservative treatment in locally advanced larynx cancer. Rep Pract Oncol Radiother 2013. [DOI: 10.1016/j.rpor.2013.03.257] [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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23
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Constant C, Sampaio I, Negreiro F, Aguiar P, Silva A, Salgueiro M, Bandeira T. Exposição ao fumo do tabaco (EFT) e morbilidade respiratória em crianças em idade escolar. Revista Portuguesa de Pneumologia 2011. [DOI: 10.1016/s0873-2159(11)70006-x] [Citation(s) in RCA: 8] [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: 11/11/2022] Open
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24
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Constant C, Sampaio I, Negreiro F, Aguiar P, Silva A, Salgueiro M, Bandeira T. Environmental tobacco smoke (ETS) exposure and respiratory morbidity in school age children. Rev Port Pneumol 2011; 17:20-26. [PMID: 21251480] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023] Open
Abstract
INTRODUCTION Tobacco smoke is a risk factor for Chronic Obstructive Pulmonary Disease and a major public health problem. Prenatal maternal smoking and post-natal environmental tobacco smoke (ETS) lead to dose-dependent decrease in lung function and respiratory morbidity. Influence of different socioeconomic indicators and ETS in the home has also been suggested. METHODS Data on 313 children (52 % male) from 4 public schools in Lisbon was analyzed [1st (46 %) and 4th graders]. ETS assessment and respiratory symptoms were based on a self-answered questionnaire. All children performed standard spirometry in the school setting and 54 % were acceptable according to ATS/ERS criteria. Descriptive and bivariate analysis of the most relevant variables was done, followed by multiple logistic regression analysis adjusted to the variables with clinical/statistical relevance. RESULTS ETS in the home was found in 41 % (maternal smoking during pregnancy 18 %, smoking mother 32 %, smoking father 38 %). Smoking fathers had lower education and less qualified occupation. Cough was more frequent in children with a smoking mother (adjusted OR = 2.1 95CI 1.1-4.0) and wheezing in children with maternal smoking during pregnancy and smoking parents. All differences were significant (p < 0.05). No association was found between parental education and cough/wheeze or ETS and respiratory infections/asthma/decreased spirometric values. CONCLUSIONS Children in Lisbon are frequently exposed to ETS which results in significant respiratory morbidity. Targeted interventions must have social conditions in consideration. In this study, field spirometry was not helpful in early detection of lung function disability in children associated with ETS.
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Affiliation(s)
- C Constant
- Serviço de Pediatria, Departamento da Criança e da Família, Clínica Universitária de Pediatria, Hospital de Santa Maria, Centro Hospitalar Lisboa Norte EPE, Lisboa, Portugal.
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25
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Morgado FN, Schubach A, Vasconcellos E, Azeredo-Coutinho RB, Valete-Rosalino CM, Quintella LP, Santos G, Salgueiro M, Palmeiro MR, Conceição-Silva F. Signs of an in situ inflammatory reaction in scars of human American tegumentary leishmaniasis. Parasite Immunol 2010; 32:285-95. [PMID: 20398229 DOI: 10.1111/j.1365-3024.2009.01188.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Skin inflammation plays an important role during the healing of American tegumentary leishmaniasis (ATL), the distribution of cells in active lesions may vary according to disease outcome and parasite antigens in ATL scars have already been shown. We evaluated by immunohistochemistry, 18 patients with 1- or 3-year-old scars and the corresponding active lesions and compared them with healthy skin. Small cell clusters in scars organized as in the active lesions spreaded over the fibrotic tissue were detected, as well as close to vessels and cutaneous glands, despite a reduction in the inflammatory process. Analysis of 1-year-old scar tissue showed reduction of NOS2, E-selectin, Ki67, Bcl-2 and Fas expression. However, similar percentages of lymphocytes and macrophages were detected when compared to active lesions. Only 3-year-old scars showed reduction of CD3(+), CD4(+) and CD8(+)T cells, in addition to reduced expression of NOS2, E-selectin, Ki67 and BCl-2. These results suggest that the pattern of cellularity of the inflammatory reaction observed in active lesions changes slowly even after clinical healing. Analysis of 3-year-old scars showed reduction of the inflammatory reaction as demonstrated by decrease in inflammatory cells and in the expression of cell-activity markers, suggesting that the host-parasite balance was only established after that period.
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Affiliation(s)
- F N Morgado
- Laboratory of Immunoparasitology, Oswaldo Cruz Institute, IOC/FIOCRUZ, Rio de Janeiro, Brazil
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26
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Vieira MJAF, Carvalho MAM, Salmito-Vanderley CSB, Salgueiro M, Viveiros ATM, Moura AAAN, Nunes JF. Características do sêmen de tambaqui (Colossoma macropomum) em latitude equatorial. ARCH ZOOTEC 2010. [DOI: 10.21071/az.v60i232.4010] [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: 11/23/2022] Open
Abstract
O tambaqui Colossoma macropomum (Cuvier, 1818) é uma espécie de teleósteo da bacia amazônica e abundante naquela região, de alto valor comercial e forte apelo culinário e esportivo sendo uma das principais espécies amazônicas com larga distribuição nos rios e nas áreas próximas a Manaus (Silva et al., 1984) Este trabalho teve por objetivo avaliar as características espermáticas do sêmen de tambaqui com e sem indução hormonal por um período de doze meses. Utilizou-se 26 machos com idade média de três anos, pertencentes ao Centro de Pesquisas em Aquicultura (CPAq) do Departamento Nacional de Obras Contra às Secas (DNOCS), devidamente identificados com chips magnéticos. Os animais foram divididos em dois grupos: induzidos (I) e não induzidos (NI). Os animais do grupo I receberam 2 mg de extrato de pituitária de carpa (EPC-1) por kg de peso vivo (PV), via intra celomática. O sêmen foi coletado após 14 horas através de massagem abdominal. Os parâmetros avaliados foram: volume, pH, osmolaridade e concentração espermática. Os peixes apresentaram peso médio de 5410 g, comprimento total de 68 cm e comprimento padrão de 59,17 cm. Para os grupos I e NI foram observados respectivamente: volume médio de 5,05 mL e 0,55 mL (p
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27
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Aira Z, Buesa I, Salgueiro M, Bilbao J, Aguilera L, Zimmermann M, Azkue JJ. Subtype-specific changes in 5-HT receptor-mediated modulation of C fibre-evoked spinal field potentials are triggered by peripheral nerve injury. Neuroscience 2010; 168:831-41. [PMID: 20412834 DOI: 10.1016/j.neuroscience.2010.04.032] [Citation(s) in RCA: 47] [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: 02/17/2010] [Revised: 03/18/2010] [Accepted: 04/15/2010] [Indexed: 10/19/2022]
Abstract
Neurotransmitter serotonin (5-HT) released from descending pain modulation pathways to the dorsal horn is crucial to spinal nociception processing. This study sought to gain insight into the modulatory roles of specific serotonin receptor subtypes in experimentally induced neuropathic pain. In rats subjected to spinal nerve ligation (SNL) surgery, we recorded field potentials evoked in the spinal dorsal horn by C fibre-input, during spinal superfusion with subtype-selective drugs. In neuropathic rats, subtype 5-HT1A agonist 8-OH-DPAT (100 nM) was found to potently depress evoked field potentials, as opposed to 5-HT2A or 5-HT2B subtype agonists TCB-2 (100 nM) or BW 723C86 (1 microM), respectively, which consistently enhanced evoked potentials. All three failed to alter spinal field potentials in sham operated rats. CP 94253 (1 microM), WAY 161503 (1 mM) or SR 57227 (at 1 microM in SNL rats, and 100 microM in sham rats), selective agonists for 5-HT1B, 5-HT2C and 5-HT3 receptors, respectively, significantly depressed evoked field potentials in both animal groups. The 5-HT4 agonist RS 67333 (1 microM) was depressant only in sham operated animals. Only after SNL, spinal superfusion with 5-HT1A- or 5-HT1B receptor-antagonists (S)-WAY 100135 (100 microM) or SB 224289 (100 microM), respectively, disinhibited C fibre-evoked potentials, whereas 5-HT2A or 5-HT2B receptor-antagonists 4F 4PP (100 microM) or SB 204741 (100 microM) depressed evoked potentials, suggesting tonic activity of all four subtypes as a consequence of experimental nerve injury. The present findings reveal profound subtype-specific changes in the functional modulatory activities of spinal serotonin receptors following peripheral nerve injury. In particular, spinal hyperexcitation promoted by receptors 5-HT2A and 5-HT2B is suggested as a novel pathogenic pathway contributing to neuropathic pain.
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Affiliation(s)
- Z Aira
- Department of Neurosciences, School of Medicine and Dentistry, Basque Country University, Barrio Sarriena s/n, 48940 Leioa, Spain
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Salgueiro M, Buesa I, Aira Z, Bilbao J, Aguilera L, Azkue J. 516 ANXIETY, DEPRESSION AND PERCEIVED SOCIAL SUPPORT IN FIBROMYALGIA SYNDROME PATIENTS. Eur J Pain 2009. [DOI: 10.1016/s1090-3801(09)60519-x] [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: 11/17/2022]
Affiliation(s)
- M. Salgueiro
- Department of Neurosciences, School of Medicine and Dentistry, Basque Country University, Leioa, Spain
| | - I. Buesa
- Department of Neurosciences, School of Medicine and Dentistry, Basque Country University, Leioa, Spain
| | - Z. Aira
- Department of Neurosciences, School of Medicine and Dentistry, Basque Country University, Leioa, Spain
| | - J. Bilbao
- Department of Preventive Medicine and Public Health, School of Medicine and Dentistry, Basque Country University, Leioa, Spain
| | - L. Aguilera
- Department of Surgery, Radiology and Physical Medicine, Basque Country University, Basurto Hospital, Bilbao, Spain
| | - J.J. Azkue
- Department of Neurosciences, School of Medicine and Dentistry, Basque Country University, Leioa, Spain
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Morgado FN, Schubach A, Rosalino CMV, Quintella LP, Santos G, Salgueiro M, Conceição-Silva F. Is the in situ inflammatory reaction an important tool to understand the cellular immune response in American tegumentary leishmaniasis? Br J Dermatol 2007; 158:50-8. [PMID: 17944980 DOI: 10.1111/j.1365-2133.2007.08255.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND The study of American tegumentary leishmaniasis (ATL) lesions might contribute to the understanding of the dynamics of the infection. OBJECTIVES To examine the cellular infiltrate of cutaneous ATL lesions and to compare these results with the detection of the parasites and clinical data. METHODS Lesions of 19 patients with ATL were evaluated through immunohistochemical analysis. RESULTS The lesions presented an inflammatory reaction mainly consisting of T cells and macrophages. Analysis of the expression of nitric oxide synthase type 2 (NOS2) showed that its intensity was directly correlated with the number of CD3+ T cells. We also observed an association between high NOS2 expression and low quantity of parasites, highlighting the importance of NOS2 in the elimination of parasites. CONCLUSIONS The present results suggest that (i) the inflammatory process is intense in cutaneous ATL lesions and maintains a similar activity for several months; (ii) the dynamics of cell infiltration change during this period, with a gradual decrease in CD8+ T cells, probably correlated with a reduction in the parasite number; (iii) neutrophils may participate in the inflammatory process even during later stages of infection; (iv) the relative increase in the number of CD4+ T cells associated with the onset of fibrosis may suggest a participation of these cells in the control of the inflammatory process; and (v) late lesions with tendency for healing usually show focal inflammation. The study of healing lesions might contribute to the understanding of the late steps of the control of the inflammatory process in ATL lesions.
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Affiliation(s)
- F N Morgado
- Laboratory of Immunoparasitology, Department of Immunology, Oswaldo Cruz Institute, IOC/FIOCRUZ, Pavilhão 26, 4o andar sala 406C, Avenida Brasil 4365, Manguinhos, Rio de Janeiro, RJ, Brazil
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Calmanovici G, Boccio J, Lysionek A, Salgueiro M, Caro R, Hager A, de Paoli T, Zubillaga M. [The pulmonary surfactant system: physiology, pathologies associated with its alteration and exogenous administration as therapeutic and diagnostic agent]. Acta Physiol Pharmacol Ther Latinoam 1999; 48:175-90. [PMID: 9914807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Pulmonary surfactant is a lipoproteic mixture synthesized and secreted by alveolar type II cells. Its principal property is to reduce the surface tension by lining on the alveolar surface. Surfactant deficiency is the major factor responsible for the respiratory distress syndrome of the newborn (RDS) and the adult respiratory distress syndrome (ARDS). Since 1980, the exogenous administration of surfactant for the treatment of these syndromes is being studied. In this work the exogenous surfactant preparations, the delivery techniques and the dosing schedule is discussed. The utilization of the exogenous natural surfactant (ENS) as precursor of a radiopharmaceutical labeled with 99mTc (99mTc-ENS) for aerial lung scintigraphy is also discussed.
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Affiliation(s)
- G Calmanovici
- Laboratorio de Radioisótopos, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Argentina
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Zamarrón C, Salgueiro M, Alvarez JM, Otero Y, Rodríguez Súarez JR. [The clinical characteristics of pulmonary tuberculosis in the elderly]. An Med Interna 1997; 14:167-9. [PMID: 9181810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Pulmonary tuberculosis remains as a significant clinical problem in the elderly. To describe age-related differences in disease manifestations, a comparison was made taking in consideration predisposing factors, clinical features, radiographic findings and diagnostic approaches in cases of pulmonary tuberculosis between two groups: equal o higher of 60 years and lower of 60 years. Elderly patients had a higher number of antecedents of previous tuberculosis and underlying diseases than younger patients. At admission, symptoms like fever and hemoptysis were more frequent in the younger group. Radiographic findings revealed that upper lung infiltrates were still common in both groups, and that elderly patients presented less pleural effusions and cavitary lesions than younger patients. Since there were differences in the clinical presentations of pulmonary tuberculosis in the elderly group, a high index of suspicion for the disease should be maintained.
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Affiliation(s)
- C Zamarrón
- Servicio de Neumología, Hospital General de Galicia, Santiago de Compostela, La Coruña
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Salgueiro M, Zamarrón C, Otero Y, Alvarez-Dobaño JM, Arias MR, Alvarez-Calderón P, Palacios A, Fernández-Naveiro J, Pérez del Molino ML, Rodríguez-Suárez JR. [Epidemiological study of tuberculosis in the health area of Santiago de Compostella in 1992, 1993 and 1994]. An Med Interna 1996; 13:111-4. [PMID: 8679837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
An exhaustive search for the clinical records of patients diagnosed with tuberculous disease was done in the hospitals of the area under study, which involves 392,000 population. During the years 1992, 1993 and 1994. There were included: 1) patients who had positive bacilloscopy and/or positive Lowenstein's culture in any specimen: 2) patients younger than 35-years-old who had pleural effusion, significant Mantoux and adenosine deaminase (ADA) over 47 U/I in the pleural effusion. In total 814 patients remained in the study with an average age of 38.39(19.39 DE) in 1992, 39.02 (20.04 DE) in 1993, and 34.1 years-old (19.2 DE) in 1994, with extreme ages of 2 months and 87 years-old. The incidence/100,000 H was: in 1992: 67.86, in 1993: 66.58 and in 1994: 73.2. The contagious forms incidence/100,000 H was: 1.5 in 1992 and 1993; and 1.79 in 1994. The hospital mortality incidence/100,000 H was 2.04 in 1992, 2.30 in 1993 and 2.6 in 1994. We conclude that tuberculosis is endemic in our area with moderately high and stationary incidence.
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Affiliation(s)
- M Salgueiro
- Servicio de Neumologia, Hospital General de Galicia Clínico-Universitario, Santiago de Compostela
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Valdés L, Alvarez D, San José E, Juanatey JR, Pose A, Valle JM, Salgueiro M, Suárez JR. Value of adenosine deaminase in the diagnosis of tuberculous pleural effusions in young patients in a region of high prevalence of tuberculosis. Thorax 1995; 50:600-3. [PMID: 7638798 PMCID: PMC1021255 DOI: 10.1136/thx.50.6.600] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.0] [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: 01/26/2023]
Abstract
BACKGROUND Pleural biopsy is usually considered important for the diagnosis of pleural effusions, especially for distinguishing between tuberculosis and neoplasia, even though tuberculous pleural fluid contains sensitive biochemical markers. In regions with a high prevalence of tuberculosis, and in patient groups with a low risk of other causes of pleurisy, the positive predictive value of these markers is increased. The criteria for performing a pleural biopsy under these circumstances have been investigated, using adenosine deaminase (ADA) as a pleural fluid marker for tuberculosis. METHODS One hundred and twenty nine patients with a pleural effusion aged < or = 35 years (mean (SD) 25.2 (4.9) years) were studied. Seventy three were men. Eighty one effusions (62.8%) were tuberculous, 12 (9.3%) parapneumonic, and 10 (7.7%) neoplastic, five were caused by pulmonary thromboembolism, four by systemic lupus erythematosus, seven by empyema, three following surgery, one was the result of asbestosis, and one of nephrotic syndrome. In five cases no definitive diagnosis was reached. ADA levels were determined by the method of Galanti and Giusti. RESULTS The diagnostic yield of procedures not involving biopsy was 94.5% (122/129). Pleural biopsy provided a diagnosis in a further two cases, but not in the remaining five. All tuberculous cases had pleural fluid levels of ADA of > 47 U/l (mean (SD) 111.1 (36.6) U/l). The only other cases in which ADA exceeded this level were six of the seven patients with empyema. Cytological examination of the pleural fluid diagnosed eight of the 10 neoplastic cases, compared with six diagnosed by pleural biopsy. CONCLUSIONS In a region with a high prevalence of tuberculosis procedures not involving pleural biopsy have a very high diagnostic yield in patients with a pleural effusion aged < or = 35 years, making biopsy necessary only in cases in which pleural levels of ADA are below 47 U/l, pleural fluid cytology is negative and, in the absence of a positive basis for some other diagnosis, neoplasia is suspected.
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Affiliation(s)
- L Valdés
- Sección de Neumología, Hospital de Conxo, Santiago de Compostela, Spain
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Valdés L, San José E, Alvarez D, Sarandeses A, Pose A, Chomón B, Alvarez-Dobaño JM, Salgueiro M, Rodríguez Suárez JR. Diagnosis of tuberculous pleurisy using the biologic parameters adenosine deaminase, lysozyme, and interferon gamma. Chest 1993; 103:458-65. [PMID: 8432137 DOI: 10.1378/chest.103.2.458] [Citation(s) in RCA: 117] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
We compared the parameters pleural adenosine deaminase (PADA, determined in 405 patients), the PADA/serum ADA ratio (P/SADA; 276 cases), pleural lysozyme (PLYS, 276 cases), the PLYS/serum LYS ratio (P/SLYS; 276 cases), and pleural interferon gamma (IFN, 145 cases) regarding their ability to differentiate tuberculous pleural effusions from others. The 405 pleural effusions were classified by previously established criteria as tuberculous (91), neoplastic (110), parapneumonic (58), empyemas (10), transudates (88), or miscellaneous (48). The intermean differences between the tuberculous group and each of the others were statistically significant for all five parameters (p < 0.01 for PLYS and P/SLYS with respect to the empyema group; p < 0.001 otherwise), except for PADA and P/SADA with respect to the empyema group. All the tuberculous pleurisy cases had PADA values of 47 U/L or more, as compared to only 5 percent of the other cases (sensitivity, 100 percent; specificity, 95 percent). P/SADA was above 1.5 in 85.7 percent of tuberculous effusions and 11 percent of the others (sensitivity, 85.7 percent; specificity, 89 percent). PLYS, with a diagnostic threshold of 15 g/ml, had a sensitivity of 85.7 percent and a specificity of 61.6 percent; P/SLYS, with a threshold of 1.1, had a sensitivity of 67.3 percent and a specificity of 90.3 percent; and IFN, with a threshold of 140 pg/ml, had a sensitivity of 94.2 percent and a specificity of 91.8 percent. The lowest misclassification rate was achieved by PADA, with statistically significant differences (p < 0.001) with respect to P/SADA, PLYS, and P/SLYS, but not with respect to IFN. The only significant pairwise correlations among these parameters were between P/SLYS and PADA and between P/SLYS and P/SADA. We conclude that PADA and IFN are useful parameters for early diagnosis of tuberculous pleurisy, and that the other parameters considered have no advantages over PADA and IFN for this purpose (though the high specificity of P/SLYS may be noted).
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Affiliation(s)
- L Valdés
- Unidad de Neumología, Hospital Provincial, Santiago de Compostela, Spain
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Valdés L, Pose A, Suàrez J, Gonzalez-Juanatey JR, Sarandeses A, San José E, Alvarez Dobaña JM, Salgueiro M, Rodríguez Suárez JR. Cholesterol: a useful parameter for distinguishing between pleural exudates and transudates. Chest 1991; 99:1097-102. [PMID: 2019164 DOI: 10.1378/chest.99.5.1097] [Citation(s) in RCA: 90] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Previously established criteria were used to classify 253 pleural effusions as transudates (65 cases), neoplastic exudates (67 cases), tuberculous exudates (65 cases), or miscellaneous exudate (56 cases). The parameters pleural LDH (PLDH), pleural LDH/serum LDH ratio (P/SLDH), and pleural protein/serum protein ratio (P/SPROT) were compared with pleural cholesterol (PCHOL) and the pleural cholesterol/serum cholesterol ratio (P/SCHOL) with regard to their usefulness for distinguishing between pleural exudates and transudates. The PCHOL values determined were 28.5 +/- 12.8 mg/dl for transudates, 88.1 +/- 30 mg/dl for neoplastic exudates, 96.5 +/- 28 mg/dl for tuberculous exudates, and 88 +/- 35.9 mg/dl for the miscellaneous group; the differences between the transudate group and the others are statistically significant (p less than 0.001). The sensitivity and specificity of P/SPROT for diagnosis of exudates were both 89 percent; the sensitivity of PLDH was 67 percent and its specificity was 95 percent; the sensitivity and specificity of P/SLDH were both 84.6 percent. Using Light's three criteria as a battery, the sensitivity was 94.6 percent and its specificity was 78.4 percent. All the transudates and 17 (9 percent) of the 188 exudates had PCHOL values below 55 mg/dl, so that with this threshold, PCHOL had a sensitivity of 91 percent and a specificity of 100 percent for diagnosis of exudates. With a threshold of 0.3, P/SCHOL had a sensitivity of 92.5 percent and a specificity of 87.6 percent. The number of misclassifications by PCHOL was less than with any other of the parameters, with statistically significant differences with respect to PLDH (p less than 0.001) and P/SLDH (p less than 0.01). We conclude that determination of PCHOL and P/SCHOL is of great value for distinguishing between pleural exudates and transudates, and should be included in routine laboratory analysis of pleural effusions.
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Affiliation(s)
- L Valdés
- Servico de Medicina Interna, Hospital Provincial, La Coruña, Spain
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Carreira J, Valdes L, Alvarez-Calderon P, Salgueiro M, Vidal J, Rodriguez Suarez J. Tuberculosis apical y configuración torácica. Arch Bronconeumol 1985. [DOI: 10.1016/s0300-2896(15)32155-4] [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: 11/29/2022]
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Castillo J, Lema M, Cameselle L, Al-Shaban W, Cerviño L, Salgueiro M, Noya M. [Hepatotoxicity caused by isoniazid]. Rev Esp Enferm Apar Dig 1981; 60:595-602. [PMID: 7330425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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