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Tapia G, González M, Burgos J, Vega MV, Méndez J, Inostroza L. Early transcriptional responses in Solanum peruvianum and Solanum lycopersicum account for different acclimation processes during water scarcity events. Sci Rep 2021; 11:15961. [PMID: 34354211 PMCID: PMC8342453 DOI: 10.1038/s41598-021-95622-2] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 07/27/2021] [Indexed: 12/13/2022] Open
Abstract
Cultivated tomato Solanum lycopersicum (Slyc) is sensitive to water shortages, while its wild relative Solanum peruvianum L. (Sper), an herbaceous perennial small shrub, can grow under water scarcity and soil salinity environments. Plastic Sper modifies the plant architecture when suffering from drought, which is mediated by the replacement of leaf organs, among other changes. The early events that trigger acclimation and improve these morphological traits are unknown. In this study, a physiological and transcriptomic approach was used to understand the processes that differentiate the response in Slyc and Sper in the context of acclimation to stress and future consequences for plant architecture. In this regard, moderate (MD) and severe drought (SD) were imposed, mediating PEG treatments. The results showed a reduction in water and osmotic potential during stress, which correlated with the upregulation of sugar and proline metabolism-related genes. Additionally, the senescence-related genes FTSH6 protease and asparagine synthase were highly induced in both species. However, GO categories such as "protein ubiquitination" or "endopeptidase inhibitor activity" were differentially enriched in Sper and Slyc, respectively. Genes related to polyamine biosynthesis were induced, while several cyclins and kinetin were downregulated in Sper under drought treatments. Repression of photosynthesis-related genes was correlated with a higher reduction in the electron transport rate in Slyc than in Sper. Additionally, transcription factors from the ERF, WRKY and NAC families were commonly induced in Sper. Although some similar responses were induced in both species under drought stress, many important changes were detected to be differentially induced. This suggests that different pathways dictate the strategies to address the early response to drought and the consequent episodes in the acclimation process in both tomato species.
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Affiliation(s)
- G Tapia
- Unidad de Recursos Genéticos Vegetales, Instituto de Investigaciones Agropecuarias, INIA-Quilamapu, Avenida Vicente Mendez 515, Chillán, Chile.
| | - M González
- Laboratorio de Microbiología Aplicada, Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Raúl Bitrán 1305, La Serena, Chile
| | - J Burgos
- Unidad de Recursos Genéticos Vegetales, Instituto de Investigaciones Agropecuarias, INIA-Quilamapu, Avenida Vicente Mendez 515, Chillán, Chile
| | - M V Vega
- Unidad de Recursos Genéticos Vegetales, Instituto de Investigaciones Agropecuarias, INIA-Quilamapu, Avenida Vicente Mendez 515, Chillán, Chile
| | - J Méndez
- Unidad de Recursos Genéticos Vegetales, Instituto de Investigaciones Agropecuarias, INIA-Quilamapu, Avenida Vicente Mendez 515, Chillán, Chile
| | - L Inostroza
- Unidad de Recursos Genéticos Vegetales, Instituto de Investigaciones Agropecuarias, INIA-Quilamapu, Avenida Vicente Mendez 515, Chillán, Chile
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Bonfiglio F, Bruscaggin A, Guidetti F, Terzi di Bergamo L, Faderl M, Spina V, Condoluci A, Bonomini L, Forestieri G, Koch R, Piffaretti D, Pini K, Pirosa MC, Cittone MG, Arribas A, Lucioni M, Ghilardi G, Wu W, Arcaini L, Baptista MJ, Bastidas G, Bea S, Boldorini R, Broccoli A, Canzonieri V, Cascione L, Ceriani L, Cogliatti S, Derenzini E, Devizzi L, Dietrich S, Elia AR, Facchetti F, Gaidano G, Garcia JF, Gerber B, Ghia P, Silva MG, Gritti G, Guidetti A, Hitz F, Inghirami G, Ladetto M, Lopez‐Guillermo A, Lucchini E, Maiorana A, Marasca R, Matutes E, Meignin V, Merli M, Moccia A, Mollejo M, Montalban C, Novak U, Oscier DG, Passamonti F, Piazza F, Pizzolitto S, Sabattini E, Salles G, Santambrogio E, Scarfó L, Stathis A, Stüssi G, Geyer JT, Tapia G, Thieblemont C, Tousseyn T, Tucci A, Visco C, Vitolo U, Zenz T, Zinzani PL, Khiabanian H, Calcinotto A, Bertoni F, Bhagat G, Campo E, Leval L, Dirnhofer S, Pileri SA, Piris MÁ, Traverse‐Glehen A, Tzankov A, Paulli M, Ponzoni M, Mazzucchelli L, Cavalli F, Zucca E, Rossi D. GENETIC AND PHENOTYPIC ATTRIBUTES OF SPLENIC MARGINAL ZONE LYMPHOMA. Hematol Oncol 2021. [DOI: 10.1002/hon.43_2879] [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: 11/05/2022]
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Ruiz PLD, Bakken IJ, Håberg SE, Tapia G, Hauge SH, Birkeland KI, Gulseth HL, Stene LC. Higher frequency of hospitalization but lower relative mortality for pandemic influenza in people with type 2 diabetes. J Intern Med 2020; 287:78-86. [PMID: 31587396 DOI: 10.1111/joim.12984] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
BACKGROUND There is limited evidence linking type 2 diabetes (T2D) to influenza-related complications. OBJECTIVES To test a set of research questions relating to pandemic influenza vaccination, hospitalization and mortality in people with and without T2D. METHODS In this population-based cohort study, we linked individual-level data from several national registers for all Norwegian residents aged 30 years or more as of January 2009. People with or without T2D at baseline (n = 2 992 228) were followed until December 2013. We used Cox regression to estimate adjusted hazard ratios (aHRs). RESULTS Pandemic influenza hospitalization was more common in individuals with T2D (aHR = 2.46, 95% CI 2.04-2.98). The mortality hazard ratio associated with hospitalization for pandemic influenza was lower in people with T2D (aHR = 1.82, 95% CI 1.21-2.74) than in those without T2D (aHR = 3.89, 95% CI 3.27-4.62). The same pattern was observed when restricting to 90-day mortality (aHR = 3.89, 95% CI 1.25-12.06 amongst those with T2D and aHR = 10.79, 95% CI 7.23-16.10 amongst those without T2D). The rate of hospitalization for pandemic influenza was 78% lower in those vaccinated compared to nonvaccinated amongst people with T2D (aHR = 0.22, 95% CI 0.11-0.39), whilst the corresponding estimate for those without T2D was 59% lower (aHR = 0.41, 95% CI 0.33-0.52). Mortality was 25% lower in those vaccinated compared to nonvaccinated amongst people with T2D (aHR = 0.75, 95% CI 0.73-0.77), whilst the corresponding estimate for those without T2D was 9% (aHR = 0.91, 95% CI 0.90-0.92). CONCLUSIONS There may have been a lower threshold for pandemic influenza hospitalization for people with T2D, rather than more severe influenza infection. Our combined results support the importance of influenza vaccination amongst people with T2D, especially during pandemics.
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Affiliation(s)
- P L D Ruiz
- From the, Department of Chronic Diseases and Ageing, Norwegian Institute of Public Health, Oslo, Norway.,Department of Endocrinology, Morbid Obesity and Preventive Medicine, Oslo University Hospital, Oslo, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - I J Bakken
- Centre for Fertility and Health, Norwegian Institute of Public Health, Oslo, Norway
| | - S E Håberg
- Centre for Fertility and Health, Norwegian Institute of Public Health, Oslo, Norway
| | - G Tapia
- From the, Department of Chronic Diseases and Ageing, Norwegian Institute of Public Health, Oslo, Norway
| | - S H Hauge
- Department of Influenza, Norwegian Institute of Public Health, Oslo, Norway
| | - K I Birkeland
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway.,Department of Transplantation Medicine, Oslo University Hospital, Oslo, Norway
| | - H L Gulseth
- From the, Department of Chronic Diseases and Ageing, Norwegian Institute of Public Health, Oslo, Norway.,Department of Endocrinology, Morbid Obesity and Preventive Medicine, Oslo University Hospital, Oslo, Norway
| | - L C Stene
- From the, Department of Chronic Diseases and Ageing, Norwegian Institute of Public Health, Oslo, Norway
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Bruscaggin A, Mollejo M, Tapia G, Gomes da Silva M, Novak U, Dietrich S, Ponzoni M, Rambaldi A, Corradini P, Vitolo U, Merli M, Tzankov A, Cogliatti S, Montalban C, Marasca R, de Leval L, Visco C, Baptista M, Tousseyn T, Facchetti F, Paulli M, Mazzucchelli L, Bea S, Oscier D, Zinzani P, Bhagat G, Inghirami G, Gaidano G, Traverse-Glehen A, Thieblemont C, Piris M, Cavalli F, Arcaini L, Zucca E, Rossi D. MULTI-OMICS LANDSCAPE OF SPLENIC MARGINAL ZONE LYMPHOMA (SMZL) - INTERIM ANALYSIS OF IELSG46 STUDY. Hematol Oncol 2019. [DOI: 10.1002/hon.138_2629] [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: 11/10/2022]
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Tapia G, Ying V, Di Re A, Stellin A, Cai TY, Warrier S. Predicting non-sentinel lymph node metastasis in Australian breast cancer patients: are the nomograms still useful in the post-Z0011 era? ANZ J Surg 2019; 89:712-717. [PMID: 31066184 DOI: 10.1111/ans.15173] [Citation(s) in RCA: 4] [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: 09/24/2018] [Revised: 02/04/2019] [Accepted: 03/03/2019] [Indexed: 12/30/2022]
Abstract
BACKGROUND Axillary lymph node dissection (ALND) can be avoided in breast cancer patients with low-volume disease in the sentinel lymph nodes (SLNs) according to Z0011 trial. We believe that nomograms developed for predicting non-sentinel lymph node (NSLN) metastases can guide the axillary treatment in patients who do not fully match the criteria of Z0011 study. We identified risk factors and evaluated the performance of three nomograms to predict NSLN status in patients with positive SLNs. METHODS Data from 526 breast cancer patients with positive SLNs who underwent ALND at two Australian hospitals from 2002 to 2015 were studied. Univariate and multivariate associations for NSLN metastasis were analysed. Predictive models evaluated were MD Anderson Cancer Centre (MDA), Helsinki University Hospital and Memorial Sloan Kettering Cancer Centre. RESULTS Thirty-nine per cent of patients demonstrated NSLN metastasis. The multivariate analysis identified extranodal extension (OR 3.2, 95% CI 2.07-4.80), tumour size >2 cm (OR 2.5, 95% CI 1.66-3.89), macrometastasis (OR 1.9, 95% CI 1.09-3.47), positive SLN ratio >0.5 (OR 1.7, 95% CI 1.16-2.60) and lymphovascular invasion (OR 1.6, 95% CI 1.09-2.44) as independent predictors for NSLN metastasis. MDA nomogram showed the best discrimination (area under the curve of 0.74) and a 9% false negative rate for predicted probability of NSLN metastasis ≤10%. CONCLUSION Our results suggest that presence of extranodal extension and tumour size >2 cm may influence the need of further axillary treatment. Conversely, ALND can be safety spared in low risk patients identified by MDA nomogram.
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Affiliation(s)
- Grace Tapia
- Department of Breast Surgery, Royal Prince Alfred Hospital and Chris O'Brien Lifehouse, Sydney, New South Wales, Australia.,General Surgery Unit, Calvary Hospital, Canberra, Australian Capital Territory, Australia
| | - Victoria Ying
- Department of Breast Surgery, Royal Prince Alfred Hospital and Chris O'Brien Lifehouse, Sydney, New South Wales, Australia
| | - Angelina Di Re
- General Surgery Unit, Calvary Hospital, Canberra, Australian Capital Territory, Australia
| | - Anna Stellin
- Department of Breast Surgery, Royal Prince Alfred Hospital and Chris O'Brien Lifehouse, Sydney, New South Wales, Australia
| | - Tommy Y Cai
- Department of Breast Surgery, Royal Prince Alfred Hospital and Chris O'Brien Lifehouse, Sydney, New South Wales, Australia
| | - Sanjay Warrier
- Department of Breast Surgery, Royal Prince Alfred Hospital and Chris O'Brien Lifehouse, Sydney, New South Wales, Australia
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Ledesma C, Rosario C, Gracia-Mora J, Tapia G, Gutiérrez L, Sumano H. Antibacterial activity of amoxicillin in vitro and its oral bioavailability in broiler chickens under the influence of 3 water sanitizers. Poult Sci 2018; 97:2391-2399. [PMID: 29897502 DOI: 10.3382/ps/pey114] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 03/12/2018] [Indexed: 11/20/2022] Open
Abstract
The interaction of 3 water sanitizers (sodium hypochlorite, iodine-polyvinylpyrrolidone, and citrate) utilized in poultry production on antibacterial activity and bioavailability of amoxicillin trihydrate (AMX) were studied. Sanitizers were mixed with AMX in prepared water, the resulting substances were regarded as amoxicillin-sanitizer products (ASP). First, the in vitro antibacterial activity of each ASP was compared to that of AMX. Then, pharmacokinetics (PK) of ASP and AMX diluted in prepared water, were carried out in broiler-chickens. Amoxicillin or ASP (20 mg/kg) from different concentrations of sanitizers was directly placed into the chicken's crop and blood samples were taken. Basic PK parameters were obtained. Serum activity/concentrations of AMX were assessed by agar diffusion and corroborated with high performance liquid chromatography. Results show that ASP of AMX/sodium hypochlorite decrease both, the antimicrobial activity of in vitro AMX and its relative bioavailability (Fr) assessed with the maximum serum concentration (Cmax), the area under the concentration-time curve, and the mean residence time (MRT) (3.80 μg/mL, 2.70 μg/mL·h, and 0.59 h, respectively), compared to the AMX administered alone (12.54 μg/mL, 44.02 μg/mL·h, and MRT 2.78 h). ASP from amoxicillin/ionophore, reduced the Cmax (10.62 μg/mL), Fr (94.67%), and MRT (2.07 h), at the highest tested concentrations. In contrast, the 2 highest concentrations of the citrate sanitizer increased the Cmax (15.07 and 15.47 μg/mL), Fr (119 and 132%), and MRT (3.32 and 4.06 h) and their in vitro antimicrobial activity. Interactions between the tested water sanitizers and AMX modify the Cmax, Fr, MRT of the latter, altering the PK/pharmacodymanic ratios for a time-dependent antibiotic. Results also reveal that the use of amoxicillin trihydrate administered through the drinking water does not meet the required PK/pharmacodymanic ratios. Thus, it is here postulated that this antibiotic should be administered at least twice a day and that its interaction with water sanitizers should be considered.
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Affiliation(s)
- C Ledesma
- Department of Physiology and Pharmacology, School of Veterinary Medicine, National Autonomous University of Mexico, Av. Universidad 3000, Coyoacán, Mexico City 04510, Mexico
| | - C Rosario
- Department of Avian Medicine, School of Veterinary Medicine, National Autonomous University of Mexico, Av. Universidad 3000, Coyoacán, Mexico City 04510, Mexico
| | - J Gracia-Mora
- Department Nuclear and Inorganic Chemistry, School of Chemistry, National Autonomous University of Mexico, Av. Universidad 3000, Coyoacán, Mexico City 04510, Mexico
| | - G Tapia
- Department of Genetic and Biostatistics, School of Veterinary Medicine, National Autonomous University of Mexico, Av. Universidad 3000, Coyoacán, Mexico City 04510, Mexico
| | - L Gutiérrez
- Department of Physiology and Pharmacology, School of Veterinary Medicine, National Autonomous University of Mexico, Av. Universidad 3000, Coyoacán, Mexico City 04510, Mexico
| | - H Sumano
- Department of Physiology and Pharmacology, School of Veterinary Medicine, National Autonomous University of Mexico, Av. Universidad 3000, Coyoacán, Mexico City 04510, Mexico
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Ledesma C, Rosario C, Gracia-Mora J, Tapia G, Sumano H, Gutiérrez L. Influence of chlorine, iodine, and citrate-based water sanitizers on the oral bioavailability of enrofloxacin in broiler chickens. J APPL POULTRY RES 2018. [DOI: 10.3382/japr/pfx044] [Citation(s) in RCA: 2] [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: 11/20/2022] Open
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Tapia G, Marquebieille C, Delile JM, Othily E, Perez-Dandieu B. Symptômes dissociatifs et conduites à risques dans un cas de trouble de stress post-traumatique (TSPT) comorbide d’un trouble lié à l’usage de substances (TUS). European Journal of Trauma & Dissociation 2017. [DOI: 10.1016/j.ejtd.2017.07.001] [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: 11/15/2022]
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Tapia G, Højen JF, Ökvist M, Olesen R, Leth S, Nissen SK, VanBelzen DJ, O'Doherty U, Mørk A, Krogsgaard K, Søgaard OS, Østergaard L, Tolstrup M, Pantaleo G, Sommerfelt MA. Sequential Vacc-4x and romidepsin during combination antiretroviral therapy (cART): Immune responses to Vacc-4x regions on p24 and changes in HIV reservoirs. J Infect 2017; 75:555-571. [PMID: 28917661 DOI: 10.1016/j.jinf.2017.09.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [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: 07/05/2017] [Revised: 08/25/2017] [Accepted: 09/04/2017] [Indexed: 10/18/2022]
Abstract
OBJECTIVES The REDUC clinical study Part B investigated Vacc-4x/rhuGM-CSF therapeutic vaccination prior to HIV latency reversal using romidepsin. The main finding was a statistically significant reduction from baseline in viral reservoir measurements. Here we evaluated HIV-specific functional T-cell responses following Vacc-4x/rhuGM-CSF immunotherapy in relation to virological outcomes on the HIV reservoir. METHODS This study, conducted in Aarhus, Denmark, enrolled participants (n = 20) with CD4>500 cells/mm3 on cART. Six Vacc-4x (1.2 mg) intradermal immunizations using rhuGM-CSF (60 μg) as adjuvant were followed by 3 weekly intravenous infusions of romidepsin (5 mg/m2). Immune responses were determined by IFN-γ ELISpot, T-cell proliferation to p24 15-mer peptides covering the Vacc-4x region, intracellular cytokine staining (ICS) to the entire HIVGag and viral inhibition. RESULTS The frequency of participants with CD8+ T-cell proliferation assay positivity was 8/16 (50%) at baseline, 11/15 (73%) post-vaccination, 6/14 (43%) during romidepsin, and 9/15 (60%)post-romidepsin. Participants with CD8+ T-cell proliferation assay positivity post-vaccination showed reductions in total HIV DNA post-vaccination (p = 0.006; q = 0.183), post-latency reversal (p = 0.005; q = 0.183), and CA-RNA reductions post-vaccination (p = 0.015; q = 0.254). Participants (40%) were defined as proliferation 'Responders' having ≥2-fold increase in assay positivity post-baseline. Robust ELISpot baseline responses were found in 87.5% participants. No significant changes were observed in the proportion of polyfunctional CD8+ T-cells to HIVGag by ICS. There was a trend towards increased viral inhibition from baseline to post-vaccination (p = 0.08). CONCLUSIONS In this 'shock and kill' approach supported by therapeutic vaccination, CD8+ T-cell proliferation represents a valuable means to monitor functional immune responses as part of the path towards functional HIV cure.
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Affiliation(s)
- G Tapia
- Centre Hospitalier Universitaire Vaudois, Rue du Bugnon 46, BH10-527, CH-1011 Lausanne, Switzerland
| | - J F Højen
- Department of Infectious Diseases, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - M Ökvist
- Bionor Pharma AS, P.O.Box 1477 Vika, NO-0116 Oslo, Norway
| | - R Olesen
- Department of Infectious Diseases, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - S Leth
- Department of Infectious Diseases, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - S K Nissen
- Department of Infectious Diseases, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - D J VanBelzen
- University of Pennsylvania, Philadelphia, 19104 PA, USA
| | - U O'Doherty
- University of Pennsylvania, Philadelphia, 19104 PA, USA
| | - A Mørk
- Bionor Pharma AS, P.O.Box 1477 Vika, NO-0116 Oslo, Norway
| | - K Krogsgaard
- Bionor Pharma AS, P.O.Box 1477 Vika, NO-0116 Oslo, Norway
| | - O S Søgaard
- Department of Infectious Diseases, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - L Østergaard
- Department of Infectious Diseases, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - M Tolstrup
- Department of Infectious Diseases, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - G Pantaleo
- Centre Hospitalier Universitaire Vaudois, Rue du Bugnon 46, BH10-527, CH-1011 Lausanne, Switzerland
| | - M A Sommerfelt
- Bionor Pharma AS, P.O.Box 1477 Vika, NO-0116 Oslo, Norway.
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Baptista M, Muncunill J, Hernandez-Rodriguez A, Dalmau J, Garcia O, Tapia G, Moreno M, Sancho J, Martinez-Picado J, Ribera J, Feliu E, Mate J, Navarro J. Epstein-Barr virus load in plasma is an early biomarker of HIV-related lymphomas. Hematol Oncol 2017. [DOI: 10.1002/hon.2439_74] [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: 11/05/2022]
Affiliation(s)
- M. Baptista
- Department of Hematology; ICO-Hospital Universitari Germans Trias i Pujol, Josep Carreras Leukaemia Research Institute, Universitat Autònoma de Barcelona; Badalona Spain
| | - J. Muncunill
- Department of Hematology; ICO-Hospital Universitari Germans Trias i Pujol, Josep Carreras Leukaemia Research Institute, Universitat Autònoma de Barcelona; Badalona Spain
| | | | - J. Dalmau
- AIDS Research Institute-IrsiCaixa, Institut d'Investigació en Ciències de la Salut Germans Trias i Pujol; Universitat Autònoma de Barcelona; Badalona Spain
| | - O. Garcia
- Department of Hematology; ICO-Hospital Universitari Germans Trias i Pujol, Josep Carreras Leukaemia Research Institute, Universitat Autònoma de Barcelona; Badalona Spain
| | - G. Tapia
- Department of Pathology, Hospital Universitari Germans Trias i Pujol; Universitat Autònoma de Barcelona; Badalona Spain
| | - M. Moreno
- Department of Hematology; ICO-Hospital Universitari Germans Trias i Pujol, Josep Carreras Leukaemia Research Institute, Universitat Autònoma de Barcelona; Badalona Spain
| | - J. Sancho
- Department of Hematology; ICO-Hospital Universitari Germans Trias i Pujol, Josep Carreras Leukaemia Research Institute, Universitat Autònoma de Barcelona; Badalona Spain
| | - J. Martinez-Picado
- AIDS Research Institute-IrsiCaixa, Institut d'Investigació en Ciències de la Salut Germans Trias i Pujol; Universitat Autònoma de Barcelona, Institució Catalana de Recerca i Estudis Avançats (ICREA); Badalona Spain
| | - J. Ribera
- Department of Hematology; ICO-Hospital Universitari Germans Trias i Pujol, Josep Carreras Leukaemia Research Institute, Universitat Autònoma de Barcelona; Badalona Spain
| | - E. Feliu
- Department of Hematology; ICO-Hospital Universitari Germans Trias i Pujol, Josep Carreras Leukaemia Research Institute, Universitat Autònoma de Barcelona; Badalona Spain
| | - J. Mate
- Department of Pathology, Hospital Universitari Germans Trias i Pujol; Universitat Autònoma de Barcelona; Badalona Spain
| | - J. Navarro
- Department of Hematology; ICO-Hospital Universitari Germans Trias i Pujol, Josep Carreras Leukaemia Research Institute, Universitat Autònoma de Barcelona; Badalona Spain
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Salas Q, Climent F, Tapia G, Riasol M, Mercadal S, Domingo Domenech E, Oliveira A, Moreno-Velázquez M, Garcia O, Aguilera C, Fernandez de Sevilla A, Sureda A, Sancho J, González Barca E. CD30 expression in diffuse large B-cell lymphoma correlates with non-GCB subtype but does not have prognostic impact in patients treated with first line R-CHOP/R-CHOP-like. Hematol Oncol 2017. [DOI: 10.1002/hon.2439_19] [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: 11/10/2022]
Affiliation(s)
- Q. Salas
- Department of Hematology; Institut Català d'Oncologia Hospitalet; Barcelona Spain
| | - F. Climent
- Pathology Department; Hospital Universitario de Bellvitge, IDIBELL; L'Hospitalet de Llobregat, Barcelona Spain
| | - G. Tapia
- Pathology Department; Hospital Germans Trías i Pujol; Badalona, Barcelona Spain
| | - M. Riasol
- Pathology Department; Hospital Universitario de Bellvitge, IDIBELL; L'Hospitalet de Llobregat, Barcelona Spain
| | - S. Mercadal
- Department of Hematology; Institut Català d'Oncologia Hospitalet, IDIBELL; L'Hospitalet de Llobregat, Barcelona Spain
| | - E. Domingo Domenech
- Department of Hematology; Institut Català d'Oncologia Hospitalet, IDIBELL; L'Hospitalet de Llobregat, Barcelona Spain
| | - A. Oliveira
- Department of Hematology; Institut Català d'Oncologia Hospitalet, IDIBELL; L'Hospitalet de Llobregat, Barcelona Spain
| | - M. Moreno-Velázquez
- Hematology Department; ICO-IJC Hospital Germans Trías i Pujol; Badalona, Barcelona Spain
| | - O. Garcia
- Hematology Department; ICO-IJC Hospital Germans Trías i Pujol; Badalona, Barcelona Spain
| | - C. Aguilera
- Department of Hematology; Institut Català d'Oncologia Hospitalet, IDIBELL; L'Hospitalet de Llobregat, Barcelona Spain
| | - A. Fernandez de Sevilla
- Hematology Department and Department of Clinical Sciences; Institut Català d'Oncologia Hospitalet, IDIBELL, and University of Barcelona; L'Hospitalet de Llobregat, Barcelona Spain
| | - A. Sureda
- Department of Hematology; Institut Català d'Oncologia Hospitalet, IDIBELL; L'Hospitalet de Llobregat, Barcelona Spain
| | - J. Sancho
- Hematology Department; ICO-IJC Hospital Germans Trías i Pujol; Badalona, Barcelona Spain
| | - E. González Barca
- Hematology Department and Department of Clinical Sciences; Institut Català d'Oncologia Hospitalet, IDIBELL, and University of Barcelona; L'Hospitalet de Llobregat, Barcelona Spain
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Baptista M, Tapia G, Muñoz-Marmol A, Muncunill J, Montoto S, Gribben J, Calaminici M, Martinez A, Gonzalez-Farre B, López-Guillermo A, González-Barca E, Terol M, Miralles P, Alcoceba M, Vall-Llovera F, Briones J, Abrisqueta P, Abella E, Provencio M, García-Ballesteros C, Moraleda J, Sancho J, Ribera J, Mate J, Navarro J. APPLICATION OF CELL-OF-ORIGIN SUBTYPES DETERMINED BY DIGITAL GENE EXPRESSION IN HIV-RELATED DIFFUSE LARGE B-CELL LYMPHOMAS. Hematol Oncol 2017. [DOI: 10.1002/hon.2438_11] [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: 11/08/2022]
Affiliation(s)
- M. Baptista
- Department of Hematology; ICO-Hospital Universitari Germans Trias i Pujol, Josep Carreras Leukaemia Research Institute, Universitat Autònoma de Barcelona; Badalona Spain
| | - G. Tapia
- Department of Pathology; Hospital Universitari Germans Trias i Pujol, Universitat Autònoma de Barcelona; Badalona Spain
| | - A. Muñoz-Marmol
- Department of Pathology; Hospital Universitari Germans Trias i Pujol, Universitat Autònoma de Barcelona; Badalona Spain
| | - J. Muncunill
- Department of Hematology; ICO-Hospital Universitari Germans Trias i Pujol, Josep Carreras Leukaemia Research Institute, Universitat Autònoma de Barcelona; Badalona Spain
| | - S. Montoto
- Department of Haemato-Oncology, Barts Cancer Institute; Queen Mary University of London; London UK
| | - J. Gribben
- Department of Haemato-Oncology, Barts Cancer Institute; Queen Mary University of London; London UK
| | - M. Calaminici
- Department of Haemato-Oncology, Barts Cancer Institute; Queen Mary University of London; London UK
| | - A. Martinez
- Department of Pathology, Hospital Clinic, Institut d'Investigacions Biomediques August Pi I Sunyer (IDIBAPS); University of Barcelona; Barcelona Spain
| | - B. Gonzalez-Farre
- Department of Pathology, Hospital Clinic, Institut d'Investigacions Biomediques August Pi I Sunyer (IDIBAPS); University of Barcelona; Barcelona Spain
| | - A. López-Guillermo
- Department of Hematology, Hospital Clinic, Institut d'Investigacions Biomediques August Pi I Sunyer (IDIBAPS); University of Barcelona; Barcelona Spain
| | - E. González-Barca
- Department of Hematology; ICO-Hospital Duran i Reynals, L'Hospitalet de Llobregat; Spain
| | - M. Terol
- Department of Hematology and Oncology; Hospital Clínic Universitari de València; Valencia Spain
| | - P. Miralles
- Department of Infectious Diseases; Hospital Gregorio Marañón; Madrid Spain
| | - M. Alcoceba
- Department of Hematology; Hospital Universitario de Salamanca; Salamanca Spain
| | - F. Vall-Llovera
- Servicio de Hematología Clínica; Hospital Universitari Mutúa de Terrassa; Terrassa Spain
| | - J. Briones
- Department of Hematology, Hospital de la Santa Creu i Sant Pau; Josep Carreras Leukaemia Research Institute; Barcelona Spain
| | - P. Abrisqueta
- Department of Hematology; Hospital Vall d'Hebrón; Barcelona Spain
| | - E. Abella
- Department of Hematology; Hospital del Mar; Barcelona Spain
| | - M. Provencio
- Department of Medical Oncology; Hospital Universitario Puerta De Hierro; Majadahonda Spain
| | | | - J. Moraleda
- Department of Hematology; Hospital Clinico Universitario Virgen de la Arrixaca; Murcia Spain
| | - J. Sancho
- Department of Hematology; ICO-Hospital Universitari Germans Trias i Pujol, Josep Carreras Leukaemia Research Institute, Universitat Autònoma de Barcelona; Badalona Spain
| | - J. Ribera
- Department of Hematology; ICO-Hospital Universitari Germans Trias i Pujol, Josep Carreras Leukaemia Research Institute, Universitat Autònoma de Barcelona; Badalona Spain
| | - J. Mate
- Department of Pathology; Hospital Universitari Germans Trias i Pujol, Universitat Autònoma de Barcelona; Badalona Spain
| | - J. Navarro
- Department of Hematology; ICO-Hospital Universitari Germans Trias i Pujol, Josep Carreras Leukaemia Research Institute, Universitat Autònoma de Barcelona; Badalona Spain
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Tudorache A, El-Hage W, Tapia G, Goutaudier N, Kalenzaga S, Jaafari N, Clarys D. Is autonoetic recollection of threat in PTSD related to impaired inhibitory skills? Eur Psychiatry 2017. [DOI: 10.1016/j.eurpsy.2017.02.356] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
IntroductionIntrusive traumatic reminiscences are among the most distressing and salient characteristics of post-traumatic stress disorder (PTSD). Associated with involuntary onsets, emotional disturbances and consciousness-related impairments, such symptoms suggest that memory functioning could be impaired in PTSD. While there is a growing body of research on experimental assessments of memory in patients with PTSD, inconsistent results remain.ObjectiveUsing an experimental methodology, this study aims to measure memory in PTSD in consideration of central features of intrusive symptoms, especially emotional, inhibitory and consciousness-related memory impairments.Method34 patients diagnosed with PTSD were compared with 37 non-PTSD controls on an item-cued directed forgetting paradigm for emotional words combined with a remember/know recognition procedure.ResultsResults confirmed prior findings of an increased and peculiarly conscious recognition of trauma-related words in PTSD. Interestingly, our results showed that, despite general memory inhibitory deficits, PTSD patients, if requested, presented a preserved ability to inhibit this improved recollection of trauma-related words.ConclusionWhile our findings highlight a biased memory functioning in favour of threatening stimuli in PTSD, inhibitory deficits for such information was not reported to play a role on this effect. Conversely, it seems that instead of inhibitory deficits, patients presented a preferential treatment of threat concordant with vigilant-avoidant models of information processing. Focusing on memory impairment in treatment for PTSD appears of prime importance. Our findings regarding preserved inhibitory skills for threat memories in the disorder could be an interesting clue for therapeutic interventions on intrusive symptoms.Disclosure of interestThe authors have not supplied their declaration of competing interest.
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Lecigne M, Tapia G. Trouble de stress post-traumatique et trouble lié à l’usage de substances illicites : le rôle médiateur des schémas précoces inadaptés. PRAT PSYCHOL 2016. [DOI: 10.1016/j.prps.2016.06.001] [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: 11/28/2022]
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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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16
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Tapia G, Méndez J, Inostroza L. Different combinations of morpho-physiological traits are responsible for tolerance to drought in wild tomatoes Solanum chilense and Solanum peruvianum. Plant Biol (Stuttg) 2016; 18:406-16. [PMID: 26499789 DOI: 10.1111/plb.12409] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [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: 07/27/2015] [Accepted: 10/21/2015] [Indexed: 05/23/2023]
Abstract
Herbaceous species can modify leaf structure during the growing season in response to drought stress and water loss. Evolution can select combinations of traits in plants for efficient water use in restricted environments. We investigated plant traits that mediate adaptation and acclimation to water stress in two herbaceous drought-tolerant species. Anatomical, morphological and physiological traits related to stems and leaves were examined under optimal watering (OW) and a long period of restricted watering (RW) in 11 accessions from three Solanaceae species (Solanum chilense, S. peruvianum and S. lycopersicum). The relationships between these traits were tested using linear regression and PCA. There were significant differences in anatomical traits between the species under both OW and RW, where leaf area correlated with stem diameter. Proline and total carbohydrates accumulated highly in S. chilense and S. peruvianum, respectively, and these osmolytes were strongly correlated with increased osmotic potential. Stomatal density varied between species but not between acclimation treatments, while stomatal rate was significantly higher in wild tomatoes. There was a strong positive relationship between stem growth rate and a group of traits together expressed as total stomatal number. Total stomata is described by integration of leaf area, stomatal density, height and internode length. It is proposed that constitutive adaptations and modifications through acclimation that mediate RW play an important role in tolerance to drought stress in herbaceous plants. The capacity for growth under drought stress was not associated with any single combination of traits in wild tomatoes, since the two species differed in relative levels of expression of various phenotypic traits.
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Affiliation(s)
- G Tapia
- Unidad de Recursos Genéticos Vegetales, Instituto de Investigaciones Agropecuarias, INIA-Quilamapu, Chillán, Chile
| | - J Méndez
- Unidad de Recursos Genéticos Vegetales, Instituto de Investigaciones Agropecuarias, INIA-Quilamapu, Chillán, Chile
| | - L Inostroza
- Unidad de Recursos Genéticos Vegetales, Instituto de Investigaciones Agropecuarias, INIA-Quilamapu, Chillán, Chile
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Abstract
This article provides an overview of the main controversies in a number of key areas of breast cancer management. Relevant studies that have contributed to guide the treatment of this heterogeneous disease in the field of breast screening, surgery, chemotherapy and radiotherapy are highlighted. Mammography and ultrasound are the main methods of breast screening. MRI and tomosynthesis are emerging as new screening tools for a selected group of breast cancer patients. From a surgical perspective, oncoplastic techniques and neoadjuvant chemotherapy are improving cosmetic results in breast-conserving surgery. For high-risk patients, controversies still remain regarding prophylactic mastectomies. Finally, the appropriate management of the axilla continues evolving with the increasing role of radiotherapy as an alternative treatment to axillary dissection.
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Affiliation(s)
- Sanjay Warrier
- Department of Breast Surgery, Chris OBrien Lifehouse, Missenden Road, Sydney 2050, Australia
- RPA Institute of Academic Surgery, Missenden Road, Sydney 2050, Australia
| | - Grace Tapia
- Department of Breast Surgery, Chris OBrien Lifehouse, Missenden Road, Sydney 2050, Australia
| | - David Goltsman
- Department of Breast Surgery, Chris OBrien Lifehouse, Missenden Road, Sydney 2050, Australia
| | - Jane Beith
- Department of Medical Oncology, Chris O' Brien Lifehouse, Missenden Road, Sydney 2050, Australia
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Ang S, Tapia G, Davidson E, Kahramangil B, Mak C, Carmalt H, Warrier S. Positive anterior margins in breast conserving surgery: Does it matter?: A systematic review of the literature. Breast 2015. [DOI: 10.1016/j.breast.2015.02.008] [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: 10/23/2022] Open
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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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Tapia G, Morales-Quintana L, Parra C, Berbel A, Alcorta M. Study of nsLTPs in Lotus japonicus genome reveal a specific epidermal cell member (LjLTP10) regulated by drought stress in aerial organs with a putative role in cutin formation. Plant Mol Biol 2013; 82:485-501. [PMID: 23733601 DOI: 10.1007/s11103-013-0080-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2012] [Accepted: 05/19/2013] [Indexed: 06/02/2023]
Abstract
The cuticle is the first defense against pathogens and the second way water is lost in plants. Hydrophobic layers covering aerial plant organs from primary stages of development form cuticle, including major classes of aliphatic wax components and cutin. Extensive research has been conducted to understand cuticle formation mechanisms in plants. However, many questions remain unresolved in the transport of lipid components to form cuticle. Database studies of the Lotus japonicus genome have revealed the presence of 24 sequences classified as putative non-specific lipid transfer proteins (nsLTPs), which were classified in seven groups; four groups were selected because of their expression in aerial organs. LjLTP8 forms a cluster with DIR1 in Arabidopsis thaliana while LjLTP6, LjLTP9, and LjLTP10 were grouped as type I LTPs. In silico studies showed a high level of structural conservation, and substrate affinity studies revealed palmitoyl-CoA as the most likely ligand for these LTPs, although the Lyso-Myristoyl Phosphatidyl Choline, Lyso-myristoyl phosphatidyl glycerol, and Lyso-stearyl phosphatidyl choline ligands also showed a high affinity with the proteins. The LjLTP6 and LjLTP10 genes were expressed in both the stems and the leaves under normal conditions and were highly induced during drought stress. LjLTP10 was the most induced gene in shoots during drought. The gene was only expressed in the epidermal cells of stems, primordial leaves, and young leaflets. LjLTP10 was positively regulated by MeJA but repressed by abscisic acid (ABA), ethylene, and H2O2, while LjLTP6 was weakly induced by MeJA, repressed by H2O2, and not affected by ABA and ethylene. We suggest that LjLTP10 is involved in plant development of stem and leaf cuticle, but also in acclimation to tolerate drought stress in L. japonicus.
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Affiliation(s)
- G Tapia
- Unidad de Recursos Genéticos, Instituto de Investigaciones Agropecuarias, INIA-Quilamapu, Chillán, Chile.
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Gutiérrez L, Vargas D, Ocampo L, Sumano H, Martinez R, Tapia G. Plasma concentrations resulting from florfenicol preparations given to pigs in their drinking water. J Anim Sci 2011; 89:2926-31. [PMID: 21454858 DOI: 10.2527/jas.2010-3576] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Florfenicol administered through the drinking water has been recommended as a metaphylactic antibacterial drug to control outbreaks of respiratory diseases in pigs caused by strains of Actinobacillus pleuropneumoniae and Pasteurella multocida, yet it is difficult to pinpoint in practice when the drug is given metaphylactically or therapeutically. Further, pigs are likely to reject florfenicol-medicated water, and plasma concentrations of the drug are likely to be marginal for diseases caused by Escherichia coli, Klebsiella pneumoniae, and Staphylococcus aureus. The reported minimal inhibitory concentration (MIC) values for these organisms show a breakpoint of 2 to 3 μg/mL. An experiment was conducted during September and October 2009. One hundred twenty healthy crossbred pigs (Landrace-Yorkshire), weighing 23 ± 6.2 kg, were used in this trial. They were randomly assigned to 5 groups, with 3 replicates of 8 animals/group. Two commercial preparations of florfenicol were administered through the drinking water at 2 concentrations (0.01 and 0.015%). Water intake was measured before and after medication, and plasma concentrations of florfenicol were determined by HPLC. Considerable rejection of florfenicol-medicated water was observed. However, plasma florfenicol concentrations were of a range sufficient for a methaphylaxis approach to preventing disease by bacteria, with MIC breakpoints of ≤ 0.25 μg/mL. Decreased efficacy as a metaphylactic medication should be expected for bacteria with MIC >0.25 μg/mL, considering the reported existence of bacteria resistant to florfenicol and the natural resistance of Streptococcus suis or E. coli to this drug.
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Affiliation(s)
- L Gutiérrez
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Av. Universidad 3000, Coyoacán, México City, México
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Tapia G, Morales-Quintana L, Inostroza L, Acuña H. Molecular characterisation of Ltchi7, a gene encoding a Class III endochitinase induced by drought stress in Lotus spp. Plant Biol (Stuttg) 2011; 13:69-77. [PMID: 21143727 DOI: 10.1111/j.1438-8677.2009.00311.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Chitinases are enzymes that digest chitin molecules, present principally in insects and fungi. In plants, these enzymes play an important role in defence against pathogen attack, although they have also been described as induced by mechanical damage, ozone, heavy metals, cold, salinity, etc. Using an annealing control primer, we isolated a gene fragment whose translated sequence has high homology with a class III endochitinase. The gene, named Ltchi7, consisted of one ORF of 1005 bp, which codes for a peptide of 334 amino acids, including a deduced signal peptide of 27 amino acid that directs protein to the extracellular space. Phylogenetic analysis suggests that Ltchi7 is within a cluster that includes Sesbania rostrata, Medicago sativa and Glycine max class III endochitinases. This group is differentiated from other species of endochitinases by the presence of an additional extension in carboxy-terminal region. Moreover, in comparison with the majority of chitinases, Ltchi7 has two additional cysteine residues, which, according to 3D modelling studies, are very close. Gene expression analysis showed enhanced transcript abundance of this gene during drought stress in Lotus tenuis and Lotus japonicus, compared with growth under normal conditions. Furthermore, its expression is restricted to nodules and roots. Expression of this gene was also induced by salt stress, hydrogen peroxide and weakly with abscisic acid.
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Affiliation(s)
- G Tapia
- Unidad de Recursos Genéticos, Instituto de Investigaciones Agropecuarias, INIA-Quilamapu, Chillán, Chile.
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Romanque P, Díaz A, Tapia G, Uribe-Echevarría S, Videla LA, Fernandez V. Delayed ischemic preconditioning protects against liver ischemia-reperfusion injury in vivo. Transplant Proc 2010; 42:1569-75. [PMID: 20620476 DOI: 10.1016/j.transproceed.2009.11.052] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2009] [Accepted: 11/18/2009] [Indexed: 11/17/2022]
Abstract
OBJECTIVES Ischemic preconditioning (IP) affords resistance to liver ischemia-reperfusion (IR) injury, providing an early phase of protection. Development of delayed IP against IR injury was assessed using partial IR in rat liver. METHODS The IP manuver (10 minutes of ischemia and up to 72 hours of reperfusion) was induced before 1 hour of ischemia and 20 hours of reperfusion. At the end of the reperfusion period, blood and liver samples were analyzed for serum alanine aminotransferase (ALT), aspartate aminotransferase (AST), lactate dehydrogenase (LDH), haptoglobin and tumor necrosis factor-alpha (TNF-alpha) levels, hepatic histology, protein carbonyl and glutathione (GSH) contents as well as nuclear factor-kappaB (NF-kappaB), and activating protein-1 (AP-1) DNA binding. RESULTS The IP manuver significantly increased protein carbonyl/GSH ratios (275%), serum ALT (42%), and AST (58%); these changes normalized after 12 hours. Serum AST, ALT, and LDH levels were significantly increased by IR (4-, 5.6-, and 7.0-fold, respectively), with significant changes in liver histology, protein carbonyl/GSH ratio (481% enhancement), and serum TNF-alpha (6.1-fold increase). Delayed IP in IR animals reduced serum AST (66%), ALT (57%), and LDH (90%) and liver GSH depletion (89%), with normalization of protein carbonyl content, serum TNF-alpha levels, and liver histology. Enhanced AP-1/NF-kappaB DNA binding ratios and diminished haptoglobin expression induced by IR were normalized by IP. CONCLUSION These data support that delayed IP suppresses IR-induced liver injury, oxidative stress, and TNF-alpha response, which coincide with recovery of IR-altered signaling functions represented by normal AP-1/NF-kappaB DNA binding ratios and acute phase responses.
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Affiliation(s)
- P Romanque
- Universidad de Chile, Facultad de Medicina, Santiago, Chile
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Gómez Vázquez M, Navarra Amayuelas R, Martin-Urda MT, Abellaneda Fernández C, Tapia G. [Subungual squamous cell carcinoma. Presentation of two cases]. Actas Dermosifiliogr 2010; 101:654-656. [PMID: 20858398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023] Open
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Gómez Vázquez M, Navarra Amayuelas R, Martin-Urda M, Abellaneda Fernández C, Tapia G. Carcinoma escamoso subungueal. Presentación de dos casos. Actas Dermo-Sifiliográficas 2010; 101:654-656. [DOI: 10.1016/j.ad.2010.02.009] [Citation(s) in RCA: 4] [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] [Received: 10/22/2009] [Revised: 01/21/2010] [Accepted: 02/16/2010] [Indexed: 11/29/2022] Open
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Tapia G, Santibáñez C, Farías J, Fuenzalida G, Varela P, Videla LA, Fernández V. Kupffer-cell activity is essential for thyroid hormone rat liver preconditioning. Mol Cell Endocrinol 2010; 323:292-7. [PMID: 20303386 DOI: 10.1016/j.mce.2010.03.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2010] [Accepted: 03/10/2010] [Indexed: 01/22/2023]
Abstract
We studied the role of Kupffer cell functioning in T3 liver preconditioning against ischemia-reperfusion (IR) injury using the macrophage inactivator gadolinium chloride (GdCl3) previous to T3 treatment. Male Sprague-Dawley rats given a single i.p. dose of 0.1 mg T3/kg were subjected to 1 h ischemia followed by 20 h reperfusion, in groups of animals pretreated with 10 mg GdCl3/kg i.v. 72 h before T(3) or with the respective vehicles. IR resulted in significant enhancement of serum aspartate aminotransferase (3.3-fold increase) and tumor necrosis factor-alpha (93% increase) levels, development of liver damage, and diminished nuclear factor-kappaB DNA binding over control values. These changes, which were suppressed by the T3 administration prior to IR, persisted in animals given GdCl3 before T3 treatment, under conditions of complete elimination of ED2+ Kupffer cells achieved in a time window of 72 h. It is concluded that Kupffer cell functioning is essential for T3 liver preconditioning, assessed in a warm IR injury model by hepatic macrophage inactivation.
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Affiliation(s)
- G Tapia
- Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Independencia 1027, Casilla 70000, Santiago 7, Chile
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Khosravi-Shahi P, Jerez Y, Mondejar R, Tapia G, Lopez MP, Martin M. Outcome of phyllodes tumors of the breast: A series of consecutive cases. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e20506] [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: 11/20/2022] Open
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Abstract
To ascertain the frequency, epidemiology, and risk factors of posttransplant diabetes mellitus (PTDM), a retrospective analysis of all first renal transplantations, without personal history of diabetes (DM) and with a follow up >or=6 months, was performed. All patients received methylprednisolone (0.5-1 g IV) immediately prior to surgery, followed by immunosuppression including steroids, cyclosporine, and azathioprine most frequently. Early hyperglycemia was defined as values >126 mg/dL during the first week after transplantation and DM by 2 blood glucose levels of >126 mg/dL after the first month of follow-up. Included were 163 patients, namely, 57.6% males and 66% recipients of a deceased donor and 12% with a first-degree family history of DM. Mean age at transplantation was 39 years (range, 17-70 years) with a mean follow-up of 64 months. Among the 163 total subjects, some developed PTDM with frequencies of 7.5%, 13%, and 23% at 1, 5, and 10 years, respectively. Among patients with a first-degree family history of DM, 37% developed PTDM compared with 14% of those without it (odds ratio [OR] = 3.6; P < .05). Early hyperglycemia was observed in 55/92 patients, 15 of whom developed PTDM. Among patients with PTDM, the frequency of early hyperglycemia was 87% compared with 54% among those who did not develop this complication (OR = 5.4; P < .05). We confirmed a high frequency of PTDM, identifying risk factors such as a first-degree family history of DM and the development of early hyperglycemia, which should be taken into account to increase our diagnostic sensitivity and improve therapeutic individualization among renal transplant patients.
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Affiliation(s)
- F Maldonado
- Department of Nephrology, Instituto de Medicina, Universidad Austral de Chile, Valdivia, Chile
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Gómez Vázquez M, Navarra Amayuelas R, Martin-Urda M, Abellaneda Fernández C, Tapia G. Subungual Squamous Cell Carcinoma. Presentation of two Cases. Actas Dermo-Sifiliográficas (English Edition) 2010. [DOI: 10.1016/s1578-2190(10)70694-6] [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: 11/30/2022] Open
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González HE, Leiva A, Tobar H, Böhmwald K, Tapia G, Torres J, Mosso LM, Bueno SM, Gonzalez P, Kalergis AM, Riedel CA. Altered chemokine receptor expression in papillary thyroid cancer. Thyroid 2009; 19:957-65. [PMID: 19731977 DOI: 10.1089/thy.2008.0432] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
BACKGROUND Papillary thyroid cancer (PTC), the most prevalent type of differentiated thyroid carcinoma, displays a strikingly high frequency of lymph node metastasis (LNM). Recent data suggest that chemokines can play an important role in promoting tumor progression and metastatic migration of tumor cells. Here we have evaluated whether PTC tissues express a different pattern of chemokine receptors and if the expression of these receptors correlates with LNM. METHODS We assessed by immunohistochemistry and flow cytometry the expression of the chemokine receptors CCR3, CCR7, and CXCR4 in tumor and nonmalignant thyroid tissues from patients suffering from PTC. Expression of these receptors in PTC was correlated with the clinical pathological condition of PTC. RESULTS Our data show a significant enhancement of CCR3 (2.5 times higher, p = 0.038) and CXCR4 (1.7 times higher, p = 0.02) expression in PTC tissues as determined by immunohistochemical staining, and of CCR3 (3.5 times higher, p < 0.002) in the plasma membrane as determined by flow cytometric analyses, compared to controls. In addition, while CCR3 (100%) and CXCR4 (90%) were present in both tumor and control thyroid tissues, expression of CCR7 was scarcely detected in PTC cells (5-10%) and not found in control cells. CXCR4 expression correlated with the classical variant of PTC (p < 0.035) and extranodal extension (p < 0.010) in patients with LNM. CONCLUSIONS Our data support the notion that CCR3, CCR7, and CXCR4 are increasingly expressed in tumor cells from PTC and that CXCR4 expression in PTC could be a potential marker for enhanced tumor aggressiveness.
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Affiliation(s)
- Hernán E González
- Millennium Nucleus on Immunology and Immunotherapy, Department of Molecular Genetics, Faculty of Biological Sciences, The Pontifical Catholic University of Chile, Santiago, Chile
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31
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Margelí M, Cirauqui B, Castellà E, Tapia G, Costa C, Gimenez-Capitan A, Etxaniz O, Ariza A, Tarón M, Rosell R. Use of BRCA1 mRNA expression levels to predict survival in breast cancer patients (p) treated with neoadjuvant chemotherapy. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.11510] [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: 11/20/2022] Open
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Camblong H, Tapia G, Rodrı́guez M. Robust digital control of a wind turbine for rated-speed and variable-power operation regime. ACTA ACUST UNITED AC 2006. [DOI: 10.1049/ip-cta:20045190] [Citation(s) in RCA: 13] [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: 11/20/2022]
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33
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López F, Soto G, Tapia G, Schnettler K, Zárate A, Avendaño R, Pinedo G, Pérez G, Ibáñez L. [Elective laparoscopic surgery in diverticular disease. A comparative study with conventional operative surgery ]. Rev Med Chil 2003; 131:719-26. [PMID: 14513691] [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: 04/27/2023]
Abstract
BACKGROUND Elective surgery in diverticular disease (DD) consists classically in performing an open sigmoidectomy. Laparoscopic surgery of the colon can have results that are comparable to those of open surgery. AIM To compare the results of laparoscopic and conventional surgery for DD. MATERIALS AND METHODS Retrospective review of preoperative, operative and postoperative variables of patients operated by laparoscopic surgery between the years 2000 and 20002. These results were compared with those of patients treated with conventional surgery in the same period. RESULTS Thirty nine patients, mean age 59 years old, were operated via laparotomy and 18 patients, mean age 47 years old, were treated with laparoscopic surgery. Both groups were comparable in gender, amount of previous laparotomies, type of surgery performed and American Society of Anestesiologists classification. The operative time was significantly higher in the laparoscopic surgery group (230 v/s 130 min), but the opioid requirements, stay in an intensive surgical care ward, postoperative ileus and hospital stay were significantly shorter in the laparoscopic group. Eleven percent of the patients included in the laparoscopic group and 31% of the patients treated with operative surgery had complications (p = 0.07). The length of the excised colon, the degree of inflammation and treatment costs were comparable. CONCLUSIONS Laparoscopic surgery in DD is feasible, safe, requires less analgesia and allows a faster recovery of post-operative ileus and a lower hospital stay.
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Affiliation(s)
- Francisco López
- Departamento de Cirugía Digestiva, Pontificia Universidad Católica de Chile.
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34
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Remirez D, Fernández V, Tapia G, González R, Videla LA. Influence of C-phycocyanin on hepatocellular parameters related to liver oxidative stress and Kupffer cell functioning. Inflamm Res 2002; 51:351-6. [PMID: 12146726 DOI: 10.1007/pl00000314] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
OBJECTIVES Kupffer cells, liver macrophages involved in immunomodulation, phagocytosis, and biochemical attack, can induce cytotoxicity and inflammation when their activity is exacerbated. The aim of this study was to evaluate the effects of C-phycocyanin on Kupffer cell functioning considering its antioxidant and anti-inflammatory properties. MATERIALS AND METHODS Actions of C-phycocyanin on colloidal carbon phagocytosis, carbon-induced respiratory burst activity, and sinusoidal lactate dehydrogenase (LDH) release were studied in isolated perfused mouse liver. The influence of C-phycocyanin on tumor necrosis factor-a (TNF-alpha) and nitrite levels in serum and liver nitric oxide synthase (NOS) activity was assessed in rats subjected to thyroid hormone (T3) administration, a condition known to underlie hepatic oxidative stress comprising an increased Kupffer cell activity. RESULTS C-phycocyanin elicited a concentration-dependent inhibition of carbon phagocytosis and carbon-induced O2 uptake (IC50 = 0.2 mg/ml) by perfused livers, with a 52% diminution in the carbon-induced sinusoidal release of LDH being found at a concentration of 0.25 mg/ml. Thyroid calorigenesis induced an 82-fold increase in serum TNF-alpha levels, an effect that was suppressed by pretreatment with C-phycocyanin, the antioxidant alpha-tocopherol, and by the Kupffer cell inactivator gadolinium chloride. C-phycocyanin also suppressed the T3-induced increases in serum nitrite levels (234%) and in the activity of hepatic NOS (75%). CONCLUSIONS C-phycocyanin significantly decreases Kupffer cell phagocytosis and the associated respiratory burst activity, effects that may contribute to the abolition of oxidative stress-induced TNF-alpha response and NO production by hyperthyroid state.
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Affiliation(s)
- D Remirez
- Centro de Investigaciones del Ozono, Centro Nacional de Investigaciones Científicas, Ciudad de la Habana, Cuba.
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35
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Videla LA, Tapia G, Fernández V. Influence of aging on Kupffer cell respiratory activity in relation to particle phagocytosis and oxidative stress parameters in mouse liver. Redox Rep 2002; 6:155-9. [PMID: 11523590 DOI: 10.1179/135100001101536265] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [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: 01/13/2023] Open
Abstract
The influence of aging on the respiratory activity of stimulated Kupffer cells was investigated in the isolated perfused mouse liver in relation to colloidal carbon phagocytosis, and the content of glutathione (GSH) and protein carbonyls as parameters related to oxidative stress. Livers from aged (22 months) mice exhibited significant 35% and 65% decreases in the carbon uptake and in the carbon-induced O2 consumption compared to young (3 months) animals, respectively, with a concomitant 46% diminution in the carbon-induced O2 consumption/carbon uptake ratio. Hepatic GSH depletion was observed in aged mice compared to young animals, whereas protein oxidation was enhanced. It is concluded that aging leads to an impairment in the functional capacity of Kupffer cells reflected by a substantial reduction in their respiratory burst activity, lessened endocytic capacity and enhanced oxidative stress, that may contribute to increased susceptibility of the liver to noxious challenges.
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Affiliation(s)
- L A Videla
- Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago.
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Bodík I, Kratochvíl K, Herdová B, Tapia G, Gaspariková E. Municipal wastewater treatment in the anaerobic-aerobic baffled filter reactor at ambient temperature. Water Sci Technol 2002; 46:127-135. [PMID: 12420975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
This paper presents the pilot-scale experiments with anaerobic-aerobic treatment of municipal wastewater. As the anaerobic part of the pilot-scale system, the combination of the anaerobic baffled reactor and the anaerobic filter was used. The aerobic part of reactor was designed as an activated sludge system with the carrier of biomass (polypropylene cords). Two pilot-scale reactors (AN-I and AN-II) under real conditions were monitored. All technological parameters were identical in both reactors, but the AN-I reactor was inoculated with the psychrophilic digested sludge. The HRT in the anaerobic and aerobic parts of reactors were about 15 hours and 4 hours, respectively. The temperature in both reactors varied during the year from 4.5 to 23 degrees C. During the yearly operation time both systems removed all monitored parameters with relatively high efficiencies (COD-78.6-83.0%, BOD5-92.5-94.0 and SS-80.9-92.7%). The intensive nitrification process was observed during the whole year in both reactors (under average temperature of 5.9 degrees C in January 2000, too). The average removal of the NH4-N varied during the year from 46.4 to 87.3%. In both systems the effective denitrification process was observed, too. In the real conditions it is possible to operate such systems for a long time without removing excess sludge.
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Affiliation(s)
- I Bodík
- Department of Environmental Sciences, Slovak University of Technology, Bratislava.
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Wiseman S, Tapia G, Schaaf N, Sullivan M, Loree T. Utilization of a plastic "washer" to prevent auricular prosthesis abutment overgrowth: report of a case and description of a technique. Int J Oral Maxillofac Implants 2001; 16:880-2. [PMID: 11769840] [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: 02/23/2023] Open
Abstract
Skin overgrowth of auricular implant abutments can be a difficult and frustrating problem, leading to multiple procedures and delaying the placement of a definitive prosthesis. In the present patient, plastic rings or "washers" were employed to successfully deal with this problem. A discussion of the management of peri-implant soft tissues is presented.
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Affiliation(s)
- S Wiseman
- Department of Head and Neck Surgery, Cancer Institute, Buffalo, New York 14263, USA
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Cornejo P, Tapia G, Puntarulo S, Galleano M, Videla LA, Fernández V. Iron-induced changes in nitric oxide and superoxide radical generation in rat liver after lindane or thyroid hormone treatment. Toxicol Lett 2001; 119:87-93. [PMID: 11311569 DOI: 10.1016/s0378-4274(00)00295-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [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: 12/11/2022]
Abstract
The involvement of cytosolic nitric oxide (NO) and mitochondrial superoxide radical (O2(.-)) production was evaluated as a mechanism triggering liver oxidative stress in lindane (40 mg/kg) or L-3,3',5-triiodothyronine (T3, 0.1 mg/kg for 2 consecutive days) treated animals (male Sprague-Dawley rats) subjected to iron overload (200 mg/kg). Lindane and iron led to 504 and 210% increases in the content of hepatic protein carbonyls as an index of oxidative stress, with a 706% enhancement being produced by their combined administration. T3 did not alter this parameter, whereas iron overload increased the content of protein carbonyls by 116% in hyperthyroid rats. Lindane increased NO generation by 106% without changes in generation of O2(.-), whereas iron enhanced both parameters by 109 and 80% over control values, respectively, with a net 33 and 46% decrease, respectively, being elicited by the combined treatment related to iron overload alone. Hyperthyroidism increased liver NO (69%) and O2(.-) (110%) generation compared to controls, effects that were either synergistically augmented or suppressed by iron overload, respectively. The in vitro addition of iron (1 micromol/mg protein) to liver cytosolic fractions from euthyroid (97%) and hyperthyroid (173%) rats also enhanced NO generation. The effects of iron overload on mitochondrial O2(.-) production by hyperthyroid rats were reproduced by the in vitro addition of 1 micromol iron/mg protein and abolished by the in vivo pretreatment with the iron chelator desferrioxamine (500 mg/kg). It is concluded that liver oxidative stress induced by iron overload is independent of NO and O2(.-) production in lindane-treated rats, whereas in hyperthyroid animals NO generation is a major factor contributing to this redox imbalance.
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Affiliation(s)
- P Cornejo
- Programa de Farmacología Molecular y Clínica, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Casilla 70086, 7, Santiago, Chile
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Junge B, Carrion Y, Bosco C, Galleano M, Puntarulo S, Tapia G, Videla LA. Effects of iron overload and lindane intoxication in relation to oxidative stress, Kupffer cell function, and liver injury in the rat. Toxicol Appl Pharmacol 2001; 170:23-8. [PMID: 11141352 DOI: 10.1006/taap.2000.9066] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Parameters related to liver oxidative stress, Kupffer cell function, and hepatocellular injury were assessed in control rats and in animals subjected to lindane (40 mg/kg; 24 h) and/or iron (200 mg/kg; 4 h) administration. Independently of lindane treatment, iron overload enhanced the levels of iron in serum and liver. Biliary efflux of glutathione disulfide increased by 140, 160, or 335% by lindane, iron, or their combined administration, respectively, and the hepatic content of protein carbonyls was elevated by 5.84-, 2.95-, and 10-fold. Colloidal carbon uptake by perfused livers was not modified by lindane and/or iron, whereas gadolinium chloride (GdCl(3)) pretreatment diminished uptake by 60-72%. Carbon-induced liver O(2) uptake was not altered by lindane, whereas iron produced a 61% increase and the combined treatment led to a 72% decrease over control values. Pretreatment with GdCl(3) abolished these effects in all groups. Lindane-treated rats showed acidophilic hepatocytes in periportal areas and some hepatic cells with nuclear pyknosis, whereas iron overload led to moderate hyperplasia and hypertrophy of Kupffer cells and moderate inflammatory cell infiltration. Combined lindane-iron treatment led to hepatocytes with pyknotic nuclei, significant acidophilia, and extensive lymphatic and neutrophil infiltration in the portal space. Hepatic myeloperoxidase activity increased by 1.1-, 2.1-, or 6.7-fold by lindane, iron, or their combined administration, respectively. Liver sinusoidal lactate dehydrogenase efflux increased by 2.2-fold (basal conditions) and 9.7-fold (carbon infusion) in the lindane-iron treated rats, effects that were diminished by 35 and 78% by GdCl(3) pretreatment, respectively. These data support the contention that lindane sensitizes the liver to the damaging effects of iron overload by providing an added enhancement to the oxidative stress status in the tissue, and this may contribute to the alteration of the respiratory activity of Kupffer cells and the development of an inflammatory response.
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Affiliation(s)
- B Junge
- Programa de Farmacología Molecular y Clínica, Instituto de Ciencias Biomédicas, Santiago, Chile
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40
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Fontseré N, Vilaseca B, Tapia G. La imagen de la semana. Med Clin (Barc) 2001. [DOI: 10.1016/s0025-7753(01)72250-6] [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: 10/27/2022]
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41
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Troiano JC, Vidal JC, Uriarte E, Gould EF, Gould JA, Heker J, Simoncini C, Tapia G. Osmotic Fragility and Erythrocyte Size in Iguana iguana (Sauria - Iguanidae) in Captivity. ACTA ACUST UNITED AC 2000. [DOI: 10.1007/s005800070022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Boisier X, Schön M, Sepúlveda A, Basualdo A, Cornejo P, Bosco C, Carrión Y, Galleano M, Tapia G, Puntarulo S, Fernández V, Videla LA. Derangement of Kupffer cell functioning and hepatotoxicity in hyperthyroid rats subjected to acute iron overload. Redox Rep 2000; 4:243-50. [PMID: 10731099 DOI: 10.1179/135100099101534963] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Liver oxidative stress, Kupffer cell functioning, and cell injury were studied in control rats and in animals subjected to L-3,3',5-tri-iodothyronine (T3) and/or acute iron overload. Thyroid calorigenesis with increased rates of hepatic O2 uptake was not altered by iron treatment, whereas iron enhanced serum and liver iron levels independently of T3. Liver thiobarbituric acid reactants formation increased by 5.8-, 5.7-, or 11.0-fold by T3, iron, or their combined treatment, respectively. Iron enhanced the content of protein carbonyls independently of T3 administration, whereas glutathione levels decreased in T3- and iron-treated rats (54%) and in T3Fe-treated animals (71%). Colloidal carbon infusion into perfused livers elicited a 109% and 68% increase in O2 uptake in T3 and iron-treated rats over controls. This parameter was decreased (78%) by the joint T3Fe administration and abolished by gadolinium chloride (GdCl3) pretreatment in all experimental groups. Hyperthyroidism and iron overload did not modify the sinusoidal efflux of lactate dehydrogenase, whereas T3Fe-treated rats exhibited a 35-fold increase over control values, with a 54% reduction by GdCl3 pretreatment. Histological studies showed a slight increase in the number or size of Kupffer cells in hyperthyroid rats or in iron overloaded animals, respectively. Kupffer cell hypertrophy and hyperplasia with presence of inflammatory cells and increased hepatic myeloperoxidase activity were found in T3Fe-treated rats. It is concluded that hyperthyroidism increases the susceptibility of the liver to the toxic effects of iron, which seems to be related to the development of a severe oxidative stress status in the tissue, thus contributing to the concomitant liver injury and impairment of Kupffer cell phagocytosis and particle-induced respiratory burst activity.
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Affiliation(s)
- X Boisier
- Programas de Farmacología Molecular y Clínica, Facultad de Medicina, Universidad de Chile, Santiago
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Tapia G, Galetovic A, Lemp E, Pino E, Lissi E. Singlet oxygen-mediated photobleaching of the prosthetic group in hemoglobins and c-phycocyanin. Photochem Photobiol 1999; 70:499-504. [PMID: 10546547] [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: 02/14/2023]
Abstract
Proteins bearing colored prosthetic groups, such as the heme group in hemoglobin or the bilin group in c-phycocyanin, quench singlet oxygen by interactions at the apoprotein and the prosthetic group levels. In both proteins, chemical modification of the chromophore constitutes only a minor reaction pathway. While total deactivation of singlet oxygen takes place with rate constants of 4.0 x 10(9) and 4.2 x 10(8) M-1 s-1 for hemoglobin and phycocyanin, respectively, the bleaching of the chromophore takes place with rate constants of 3.2 x 10(6) and approximately 1 x 10(7) M-1 s-1. Irradiation of phycocyanin with red light bleaches the chromophore with low yields (approximately 0.8 x 10(-4)). Part of this bleaching is mediated by singlet oxygen produced by the irradiation of the bilin group. The low relevance of the singlet oxygen pathway is compatible with a low quantum yield (approximately 10(-3)) of free singlet oxygen production after irradiation of the protein.
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Affiliation(s)
- G Tapia
- Instituto de Química, Universidad Católica de Valparaiso, Santiago, Chile
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44
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Abstract
The influence of thyroid hormone administration (daily doses of 0.1 mg of 3,3',5-triiodothyranine (T3)/kg for 1-3 consecutive days) on rat liver protein oxidation was investigated in relation to the calorigenic and lipid peroxidative actions of the hormone. T3 treatment elicited a progressive enhancement in the serum levels of the hormone, the rectal temperature of the animals, and in the rate of O2 uptake of the liver, changes that are significantly correlated and evidence the development of thyroid calorigenesis. Liver lipid peroxidation was augmented by T3 administration as determined by the tissue content of thiobarbituric acid reactants, with a maximal effect (3.1-fold increase) being found at 2 days after treatment, whereas protein oxidation measured by the content of protein hydrazone derivatives exhibited a maximal 88% increase at 3 days. Maximal rates of lipid peroxidation occur at 1 day after the administration of T3, whereas those of protein oxidation are attained after treatment with three daily doses of T3, time at which the former levels off. It is concluded that T3 administration induces a substantial enhancement in hepatic protein oxidation, in addition to lipid peroxidation, that seems to be due to the higher oxidative stress status conditioned in the liver by thyroid calorigenesis. Both processes exhibit a differential time course of changes, that may represent differences in the susceptibility of target molecules to free radical attack and/or in the efficiency of repair mechanisms.
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Affiliation(s)
- G Tapia
- Programa de Farmacología Molecular y Clínica, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago
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Abstract
A possible protective effect of vitamin E (DL-alpha-tocopherol) on chromosomal damage was evaluated in lymphocytes from patients with Down's syndrome (DS) and from controls. This included the analysis of the basal and G2 chromosomal aberration frequencies in lymphocytes cultured with and without 100 microM vitamin E. The chromosomal damage in G2 was determined by scoring the number of chromosomal aberrations in lymphocyte cultures treated with 5 mM caffeine, 2 h before harvesting. Vitamin E treatment decreased the basal and G2 chromosomal aberrations both in control and DS lymphocytes. In DS cells, this protective effect, expressed as a decrease in the chromosomal damage, was greater (50%) than in controls (30%). These results suggest that the increment in basal and G2 aberrations yield in DS lymphocytes may be related to the increase in oxidative damage reported in these patients.
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Affiliation(s)
- J Pincheira
- Departamento de Pediatría y Cirugía Infantil, Facultad de Medicina, Universidad de Chile, Santiago
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46
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Caballero CS, Sumano LH, Tapia G, Ocampo CL. Vanil-mandelic Acid as Indicator of Acute Stress in Cows at Slaughter. Journal of Applied Animal Research 1998. [DOI: 10.1080/09712119.1998.9706699] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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47
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Perula de Torres LA, Lluch C, Ruiz Moral R, Espejo Espejo J, Tapia G, Mengual Luque P. [Prevalence of physical activity in relation to variable socio-demographic conditions and life style in Cordoban students]. Rev Esp Salud Publica 1998; 72:233-44. [PMID: 9810830] [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: 02/09/2023] Open
Abstract
BACKGROUND Regular physical exercise is not a widespread habit among the population. Early childhood in a crucial stage for acquiring this habit. The objective of this study was that of ascertaining the behavior of school-age children with regard to the degree of physical activity they do and to examine the factors involved. METHODS An observational study was conducted by means of a survey based on a questionnaire which 6th and 8th grade students in a Basic Health Care District of Cordoba (N-585) filled out on their own. Questions were asked regarding the frequency of exercise, preferences and prospects for practicing sports, the children's physical shape and school physical education classes, in addition to other behavior comprising their lifestyles. A dual-variable (p .05) and a multiple-variable analysis was conducted employing logistic regression. RESULTS A total of 548 students filled out the survey (response rate = 97.8%). 79.3% (IC95% 75.7-82.6) were involved in extracurricular physical activities, 21.0% (IC95% 17.1-24.7%) being involved in intense physical exercise. 50.5% (IC95% 46.3-54.8) did not think that they were in good physical shape. The age, sex, type of residence, the involvement in sports on the part of their parents or a close friend and what they considered their degree of healthiness to be comprised the variables quite strongly linked to doing exercise (p .001). CONCLUSIONS The prevalence of physical exercise is high, although it progressively decreased with age, especially for girls. A major number of students considered themselves to be in unsatisfactory physical condition.
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Tapia G, Troncoso P, Galleano M, Fernandez V, Puntarulo S, Videla LA. Time course study of the influence of acute iron overload on Kupffer cell functioning and hepatotoxicity assessed in the isolated perfused rat liver. Hepatology 1998; 27:1311-6. [PMID: 9581685 DOI: 10.1002/hep.510270517] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Abstract
This study tested the hypothesis that acute iron overload (500 mg/kg) alters Kupffer cell functioning by promoting free radical reactions associated with the respiratory burst of liver macrophages, assessed in the isolated perfused rat liver under conditions of Kupffer cell stimulation by carbon infusion and inactivation by gadolinium chloride pretreatment. Total serum and hepatic iron levels were markedly enhanced compared with control values 2 to 24 hours after iron treatment. Total liver O2 uptake progressively increased by iron overload reaching a maximum at 6 hours after treatment, an effect that was completely blocked by GdCl3. Concomitantly, carbon-induced GdCl3-sensitive liver O2 uptake was either enhanced by 119% at 2 hours after iron overload, diminished compared with control values at 4 hours, or abolished at 6 hours. Iron-overloaded rats showed a marked increase in liver sinusoidal lactate dehydrogenase efflux at 4 and 6 hours after treatment, an effect that is exacerbated by carbon infusion and reduced (69%-89%) by GdCl3 pretreatment. Both basal and carbon-induced lactate dehydrogenase effluxes returned to control values at 24 hours after iron overload concomitantly with depression of the basal O2 uptake, without development of iron-induced GdCl3-sensitive respiration or Kupffer cell activation by carbon infusion. It is concluded that iron overload induces a derangement in the Kupffer cell functional status represented by early increases in macrophage-dependent respiratory activity, which may contribute to the concomitant liver injury that developed and to the impairment of both hepatic respiration and the macrophage response to particle stimulation observed at later times after treatment.
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Affiliation(s)
- G Tapia
- Programa de Farmacología Molecular y Clínica, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago
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49
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Ferreira J, Tapia G, Videla LA. Effects of the Kupffer cell inactivator gadolinium chloride on rat liver oxygen uptake and content of mitochondrial cytochromes. FEBS Lett 1998; 426:263-5. [PMID: 9599021 DOI: 10.1016/s0014-5793(98)00356-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The effect of gadolinium chloride (GdCl3) on the content of rat liver mitochondrial cytochromes was investigated in relation to the basal rate of O2 uptake and Kupffer cell functioning, assessed in liver perfusion studies. (1) A single dose of GdCl3 (10 mg/kg) produced a significant diminution in Kupffer cell functioning, evidenced by the decreases in colloidal carbon uptake and in carbon-induced O2 uptake observed at 6-24 h after treatment, without changes in the sinusoidal lactate dehydrogenase efflux as index of tissue viability; at 48 h after GdCl3 administration, carbon phagocytosis was recovered to control values, whereas carbon-induced O2 uptake remained lower than control values. (2) GdCl3 also caused a 34% decrease in the basal rate of O2 consumption of the liver at 24 h after treatment, which returned towards control values at 48 h. (3) The content of mitochondrial cytochromes c1 and c at 24 h after GdCl3 treatment was significantly reduced by 40 and 32%, respectively, which returned to control values at 48 h, without changes in that of cytochromes b and a+a3. It is concluded that GdCl3-induced decrease in liver O2 consumption is a reversible phenomenon that seems to be due to a diminution in the content of mitochondrial cytochromes c1 and c.
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Affiliation(s)
- J Ferreira
- Programa de Farmacología Molecular y Clínica, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Casilla, Santiago
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Pérula de Torres LA, Ruiz Moral R, Tapia G, Lluch C, Enciso Verge I, Espejo Espejo J. [Health status and morbidity perceived by a group of school children]. Aten Primaria 1998; 21:137-44. [PMID: 9607232] [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: 02/07/2023] Open
Abstract
OBJECTIVES To find what self-perception of their health (SPH) and of their morbidity by school-children; and to analyse possible differences, in function of their social and demographic characteristics and life-styles. DESIGN An observational crossover study, using a health questionnaire. SETTING Community. PARTICIPANTS 548 6th and 8th grade (EGB) children in the Occidente Health Area, Córdoba. INTERVENTIONS Self-filled health questionnaire. MEASUREMENTS AND MAIN RESULTS 43.7% of students felt very healthy. Bad SPH was independently associated with being a girl, poor state of physical fitness and feeling unhappy. Tiredness and nervousness were the most frequent disorders suffered by school-children. CONCLUSIONS Although the SPH of the school-children was acceptable, we found high perceived morbidity and prevalence of accidents, along with a striking consumption of medication.
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Affiliation(s)
- L A Pérula de Torres
- Unidad Docente de Medicina de Familia y Comunitaria de Córdoba, Centro de Salud Occidente.
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