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Spalato-Ceruso M, Laroche-Clary A, Perret R, Valverde Y, Chaire V, Derieppe MA, Velasco V, Bourdon A, Italiano A. Genome-wide CRISPR/Cas9 library screening identified ATM signaling network genes as critical drivers for resistance to ATR inhibition in soft-tissue sarcomas: synthetic lethality and therapeutic implications. Exp Hematol Oncol 2023; 12:51. [PMID: 37259134 DOI: 10.1186/s40164-023-00416-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 05/16/2023] [Indexed: 06/02/2023] Open
Abstract
Soft-tissue sarcoma (STS) are a heterogeneous group of rare tumors with different biological behavior that are fatal in more than 40% of cases, due to their metastatic evolution and inadequate treatment options. ATR inhibition already showed an activity, even if modest, in broad pre-clinical models of STS. By using genome-wide CRISPR/Cas9 library screening, we identified ATM signaling network genes as critical drivers for resistance to the specific ATR inhibitor AZD6738. The role of such genes in resistance to AZD6738 was confirmed by using CRISPR/Cas9 knockout models. More strikingly, the ATM inhibitor AZD0156 works synergistically with AZD6738 in vitro and abolishes STS growth in vivo in our models of most frequent histotypes (such as dedifferentiated liposarcoma, leiomyosarcoma, and undifferentiated pleomorphic sarcoma among others). Moreover, the combination of AZD6738 and AZD0156 induced significantly higher levels of DNA damage than either drug used as single agent alone. In summary, our results demonstrate that targeting ATM is an effective approach to overcome resistance to ATR inhibition in different STS subtypes, including the most frequent histologies.
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Affiliation(s)
- M Spalato-Ceruso
- Sarcoma Unit, Institut Bergonié, 229 cours de l'Argonne, Bordeaux, 33000, France
- INSERM, U1312, Bordeaux, France
| | - A Laroche-Clary
- Sarcoma Unit, Institut Bergonié, 229 cours de l'Argonne, Bordeaux, 33000, France
- INSERM, U1312, Bordeaux, France
| | - R Perret
- Department of Pathology, Institut Bergonié, Bordeaux, France
| | - Y Valverde
- Sarcoma Unit, Institut Bergonié, 229 cours de l'Argonne, Bordeaux, 33000, France
- INSERM, U1312, Bordeaux, France
| | - V Chaire
- Sarcoma Unit, Institut Bergonié, 229 cours de l'Argonne, Bordeaux, 33000, France
- INSERM, U1312, Bordeaux, France
| | | | - V Velasco
- Department of Pathology, Institut Bergonié, Bordeaux, France
| | - A Bourdon
- Bioinformatics, Data and Digital Health Departement, Insitut Bergonié, Bordeaux, France
| | - A Italiano
- Sarcoma Unit, Institut Bergonié, 229 cours de l'Argonne, Bordeaux, 33000, France.
- INSERM, U1312, Bordeaux, France.
- University of Bordeaux, Bordeaux, France.
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2
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Velasco V, Gragnano A, Ghelfi M, Vecchio LP. Health lifestyles during adolescence: clustering of health behaviours and social determinants in Italian adolescents. J Public Health (Oxf) 2023; 45:218-228. [PMID: 34657958 DOI: 10.1093/pubmed/fdab371] [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: 11/14/2022] Open
Abstract
BACKGROUND Health behaviours in adolescence have a high impact on both current and future health. The literature claims a focus on social determinants and shows that these behaviours are associated. The concept of 'health lifestyles' should be considered to account for co-occurring health behaviours and determinants interactions. The aim of this study is to increase our understanding of adolescents' health lifestyles and to (i) cluster adolescents according to a comprehensive number of health behaviours and (ii) describe these groups according to sociodemographic characteristics, perceptions of life contexts (family, school, peers or neighbourhood) and perceived physical and psychosocial health conditions. METHODS In Italy, 906 15-year-old students participated in the cross-national Health Behaviour of School-aged Children study. Clusters were identified by applying the KAMILA clustering method and compared using analysis of variance and chi-squared tests.Results: Four clusters were identified: 'substance consumers', 'media lovers', 'active students' and 'passive students'. Each cluster exhibited different characteristics related to health behaviours and social determinants. CONCLUSIONS Interesting associations between health behaviours were identified, which showed the relevance of considering the adolescents' overall lifestyles. The description of each cluster permitted the identification of risks and protective factors, which may be important for designing effective health promotion activities.
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Affiliation(s)
- V Velasco
- Psychology Department, Milano-Bicocca University, piazza dell'Ateneo Nuovo 1, 20126 Milan Italy
| | - A Gragnano
- Psychology Department, Milano-Bicocca University, piazza dell'Ateneo Nuovo 1, 20126 Milan Italy
| | - M Ghelfi
- Psychology Department, Milano-Bicocca University, piazza dell'Ateneo Nuovo 1, 20126 Milan Italy
| | | | - L P Vecchio
- Psychology Department, Milano-Bicocca University, piazza dell'Ateneo Nuovo 1, 20126 Milan Italy
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3
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Lorini C, Velasco V, Zanobini P, Vecchio L, Bonaccorsi G. Beliefs about vaccines and information about coronavirus, COVID-19 and the pandemic. Findings from Italy. Eur J Public Health 2022. [PMCID: PMC9594391 DOI: 10.1093/eurpub/ckac129.657] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Introduction In Italy, COVID-19 vaccination campaign for school personnel started in February 2021 and began mandatory from 15th December 2021 to all the people who work within schools. Here we described Italian school principals’ beliefs about vaccines and its association with feelings about information regarding coronavirus, COVID-19 and the pandemic. Methods Data collection started in October 2021 and is ongoing. Beliefs about vaccines were investigated both for COVID-19 vaccination and for vaccination in general. Results A total of 726 questionnaires were analyzed so far. The majority feels to be well informed about the coronavirus or the pandemic (75%) and not at all nor a little confused about COVID-19 information (89%). Only 2% disagree/strongly disagree with the statement “vaccination is compatible with my attitudes or religious beliefs”. Beliefs regarding vaccines in general are correlated with those regarding COVID-19 vaccines. When different beliefs are described, we observed a trend towards considering COVID-19 vaccines less safe and effective, but more important to protect themselves and their family than other vaccines. Moreover, beliefs about vaccination in general and regarding COVID-19 are associated with how well they feel informed about the coronavirus or the pandemic, and whether they feel confused about COVID-19 information. In particular: the better they feel informed about the coronavirus and the related pandemic, the higher the perception of vaccines in general and COVID-19 vaccine as important, safe, and effective; the less they feel confused about COVID-19 information. Conclusions School principals showed a high level of confidence on vaccines. The association between beliefs in vaccinations and the characteristics of information about COVID-19 supported the effectiveness of Italian vaccination policy and information campaigns.
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Affiliation(s)
- C Lorini
- Department of Health Science, University of Florence , Florence, Italy
| | - V Velasco
- Department of Psychology, University of Milano-Bicocca , Milan, Italy
| | - P Zanobini
- Department of Health Science, University of Florence , Florence, Italy
| | - L Vecchio
- Department of Psychology, University of Milano-Bicocca , Milan, Italy
| | - G Bonaccorsi
- Department of Health Science, University of Florence , Florence, Italy
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Velasco V, Cominelli S, Scattola P, Celata C. Life skill education at the time of COVID-19: perceptions and strategies of Italian expert school educators. Health Educ Res 2022; 36:615-633. [PMID: 34755182 PMCID: PMC8689966 DOI: 10.1093/her/cyab037] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Revised: 07/22/2021] [Accepted: 10/28/2021] [Indexed: 06/13/2023]
Abstract
The coronavirus disease 2019 (COVID-19) pandemic has had a huge effect on adolescents' health and learning. Health promotion strategies should be valued, and life skill education is a potential approach in this direction. This study aimed to investigate the implementation of an evidence-based life skill education programme during the COVID-19 pandemic in the Lombardy Region (Italy) by collecting opinions about the programme's usefulness and feasibility and identifying the strategies for implementing it through distance teaching. The study involved 63 middle school expert teachers, principals or coordinators in life skill education. An online questionnaire with closed- and open-ended questions was used. A qualitative content analysis was carried out using N-Vivo Answers software. The participants recognized the high value of life skill education at the time of COVID-19, but they showed reticence regarding its feasibility. Positive effects of the programme on both health and learning outcomes were reported. The obstacles were related to interpersonal aspects, student involvement, methods, organization and planning. Many strategies were suggested related to the teaching method, the curriculum organization and the adaptation needs. These strategies can be used to implement active and cooperative learning at a distance to reinforce students' life skills to cope with the crisis and promote their health.
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Affiliation(s)
- V Velasco
- Department of Psychology, Università degli Studi di Milano-Bicocca, Piazza dell’Ateneo Nuovo 1, Milan 20126, Italy
| | - S Cominelli
- Department of Psychology, Università degli Studi di Milano-Bicocca, Piazza dell’Ateneo Nuovo 1, Milan 20126, Italy
| | - P Scattola
- Health Promotion Division, Specific Prevention Unit, Health Promotion Division, ATS Milano Città Metropolitana, via Juvara 22, Milan 20129, Italy
| | - C Celata
- Health Promotion Division, Specific Prevention Unit, Health Promotion Division, ATS Milano Città Metropolitana, via Juvara 22, Milan 20129, Italy
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Blanco Garcia-Granero D, Barranco R, García-Moguel I, Velasco V, Diéguez Pastor MC. First Case of Symmetric Drug-Related Intertriginous and Flexural Exanthema Induced by Meropenem. J Investig Allergol Clin Immunol 2021; 31:516-517. [PMID: 33661103 DOI: 10.18176/jiaci.0685] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
| | - R Barranco
- Allergy Department, 12 de Octubre University Hospital, Madrid, Spain.,ARADyAL
| | - I García-Moguel
- Allergy Department, 12 de Octubre University Hospital, Madrid, Spain
| | - V Velasco
- Dermatology Department, 12 de Octubre University Hospital, Madrid, Spain
| | - M C Diéguez Pastor
- Allergy Department, 12 de Octubre University Hospital, Madrid, Spain.,ARADyAL
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Verbeke S, Perret R, Chaire V, Richard E, Velasco V, Giles F, Cavalcante L, Italiano A. GSK3-beta as a candidate therapeutic target in soft tissue sarcomas. J Hematol Oncol 2021; 14:202. [PMID: 34857030 PMCID: PMC8641200 DOI: 10.1186/s13045-021-01215-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Accepted: 11/09/2021] [Indexed: 01/13/2023] Open
Abstract
Soft tissue sarcoma (STS) is a predominantly fatal rare malignancy with inadequate treatment options. Glycogen synthase kinase 3β (GSK-3β) is an emerging target in human malignancies. Its therapeutic relevance in STS is unknown. We analyzed the prognostic impact of GSK-3β gene and protein expression in two independent cohorts of patients with STS. We then treated STS cell lines and mice xenografts with a novel GSK-3 inhibitor 9-ING-41 alone or in combination with chemotherapy. We demonstrated that 9-ING-41 treatment induced significant STS cells apoptosis and was synergistic in vivo when combined with chemotherapy. Mechanistically, 9-ING-41 induces significant apoptosis of STS cells via suppression of NF-κB-mediated X-linked inhibitor of apoptosis protein (XIAP) expression. These data support the inclusion of patients with STS in clinical studies of 9-ING-41 alone and in combination with chemotherapy.
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Affiliation(s)
- S Verbeke
- Sarcoma Unit, Institut Bergonié, 229 cours de l'Argonne, 33000, Bordeaux, France
- INSERM, U1218, Bordeaux, France
| | - R Perret
- Department of Pathology, Institut Bergonié, Bordeaux, France
| | - V Chaire
- Sarcoma Unit, Institut Bergonié, 229 cours de l'Argonne, 33000, Bordeaux, France
- INSERM, U1218, Bordeaux, France
| | | | - V Velasco
- Department of Pathology, Institut Bergonié, Bordeaux, France
| | - F Giles
- Actuate Therapeutics, Fort Worth, TX, USA
| | | | - A Italiano
- Sarcoma Unit, Institut Bergonié, 229 cours de l'Argonne, 33000, Bordeaux, France.
- INSERM, U1218, Bordeaux, France.
- Faculty of Medicine, University of Bordeaux, Bordeaux, France.
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Lofa A, Velasco V, Gerding M, López MD, Vallejos D, Bonilla AM, Logue CM. Antibiotic-resistant Staphylococcus aureus strains of swine origin: molecular typing and susceptibility to oregano (Origanum vulgare L.) essential oil and maqui (Aristotelia chilensis (Molina) Stuntz) extract. J Appl Microbiol 2019; 127:1048-1056. [PMID: 31328837 DOI: 10.1111/jam.14393] [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: 01/31/2019] [Revised: 05/26/2019] [Accepted: 07/10/2019] [Indexed: 01/17/2023]
Abstract
AIM The molecular typing and the susceptibility of Staphylococcus aureus strains of swine origin to antibiotics, oregano (Origanum vulgare L.) essential oil (EO) and Chilean blackberry maqui (Aristotelia chilensis (Molina) Stuntz) extract were determined. METHODS AND RESULTS Twenty S. aureus strains of swine origin were subjected to molecular typing, of which six strains were selected for antimicrobial susceptibility testing. The epsilon test (Etest) was used to determine the antibiotic susceptibility. The susceptibility to natural antimicrobials (NAs): oregano EO, maqui extract, thymol (Thy) and carvacrol (Carv), was carried out using the disk diffusion method. The S. aureus strains were genetically diverse. All strains were resistant to at least one class of antibiotic, and two strains were multidrug-resistant. The minimum inhibitory concentration of oregano EO, Thy and Carv was 0·01-0·04%. Maqui extract did not show antistaphylococcal activity. CONCLUSIONS Natural antimicrobials extracted from oregano have an inhibitory activity against S. aureus strains from swine origin, with no effect using maqui extract. SIGNIFICANCE AND IMPACT OF THE STUDY This study provides information about the characteristics of S. aureus strains of swine origin, and about the potential use of NAs from oregano to enhance the control of antibiotic-resistant S. aureus strains in the pork supply chain.
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Affiliation(s)
- A Lofa
- Departamento de Producción Animal, Facultad de Agronomía, Universidad de Concepción, Chillán, Chile.,Departamento de Ciências, Faculdade de Medicina Veterinária, Universidade José Eduardo dos Santos, Huambo, Angola
| | - V Velasco
- Departamento de Producción Animal, Facultad de Agronomía, Universidad de Concepción, Chillán, Chile
| | - M Gerding
- Departamento de Producción Vegetal, Facultad de Agronomía, Universidad de Concepción, Chillán, Chile
| | - M D López
- Departamento de Producción Vegetal, Facultad de Agronomía, Universidad de Concepción, Chillán, Chile
| | - D Vallejos
- Departamento de Producción Animal, Facultad de Agronomía, Universidad de Concepción, Chillán, Chile
| | - A M Bonilla
- Departamento de Producción Animal, Facultad de Agronomía, Universidad de Concepción, Chillán, Chile
| | - C M Logue
- College of Veterinary Medicine, University of Georgia, Athens, GA, USA
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Leroy L, Massé J, Adam J, Brouste V, Signolle N, Soubeyran I, Velasco V, Khalifa E, Lortal B, Italiano A, Besse B, Le Moulec S. IDO-1 and PD-L1 predict response to immunotherapy in advanced non small cell lung cancer: An NGS and multiplex IHC analysis. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx376.041] [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: 11/14/2022] Open
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Bonnefoi H, Richard E, Grellety T, Velasco V, MacGrogan G, Iggo R. Abstract P4-06-02: The mammary ducts create a favourable microenvironment for xenografting of luminal and molecular apocrine breast tumours. Cancer Res 2017. [DOI: 10.1158/1538-7445.sabcs16-p4-06-02] [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: 11/16/2022]
Abstract
Abstract
This abstract was not presented at the symposium.
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Affiliation(s)
- H Bonnefoi
- Bergonie Cancer Institute, INSERM U1218, University of Bordeaux, Bordeaux, France
| | - E Richard
- Bergonie Cancer Institute, INSERM U1218, University of Bordeaux, Bordeaux, France
| | - T Grellety
- Bergonie Cancer Institute, INSERM U1218, University of Bordeaux, Bordeaux, France
| | - V Velasco
- Bergonie Cancer Institute, INSERM U1218, University of Bordeaux, Bordeaux, France
| | - G MacGrogan
- Bergonie Cancer Institute, INSERM U1218, University of Bordeaux, Bordeaux, France
| | - R Iggo
- Bergonie Cancer Institute, INSERM U1218, University of Bordeaux, Bordeaux, France
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Ruiz-Gómez S, Ranchal R, Abuín M, Aragón AM, Velasco V, Marín P, Mascaraque A, Pérez L. Antiferromagnetic FeMn alloys electrodeposited from chloride-based electrolytes. Phys Chem Chem Phys 2016; 18:8212-8. [PMID: 26925594 DOI: 10.1039/c5cp07720f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The capability of synthesizing Fe-based antiferromagnetic metal alloys would fuel the use of electrodeposition in the design of new magnetic devices such as high-aspect-ratio spin valves or new nanostructured hard magnetic composites. Here we report the synthesis of high quality antiferromagnetic FeMn alloys electrodeposited from chloride-based electrolytes. We have found that in order to grow homogeneous FeMn films it is necessary to incorporate a large concentration of NH4Cl as an additive in the electrolyte. The study of the structure and magnetic properties shows that films with composition close to Fe50Mn50 are homogeneous antiferromagnetic alloys. We have established a parameter window for the synthesis of FeMn alloys that show antiferromagnetism at room temperature.
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Affiliation(s)
- Sandra Ruiz-Gómez
- Dept. Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain.
| | - Rocío Ranchal
- Dept. Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain.
| | - Manuel Abuín
- Dept. Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain. and CEI Campus Moncloa, UCM-UPM, 28040 Madrid, Spain
| | - Ana María Aragón
- Instituto de Magnetismo Aplicado, ADIF-UCM, PO Box 155, E-28230 Las Rozas, Spain
| | - Víctor Velasco
- Dept. Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain. and Instituto de Magnetismo Aplicado, ADIF-UCM, PO Box 155, E-28230 Las Rozas, Spain
| | - Pilar Marín
- Dept. Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain. and Instituto de Magnetismo Aplicado, ADIF-UCM, PO Box 155, E-28230 Las Rozas, Spain
| | - Arantzazu Mascaraque
- Dept. Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain. and Unidad Asociada IQFR (CSIC)-UCM, Madrid, 28040, Spain
| | - Lucas Pérez
- Dept. Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain. and Instituto de Sistemas Optoelectrónicos y Microtecnología, Universidad Politécnica de Madrid, 28040 Madrid, Spain
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Velasco V, Aguilà D, Barrios LA, Borilovic I, Roubeau O, Ribas-Ariño J, Fumanal M, Teat SJ, Aromí G. New coordination features; a bridging pyridine and the forced shortest non-covalent distance between two CO 32- species. Chem Sci 2015; 6:123-131. [PMID: 28616127 PMCID: PMC5461881 DOI: 10.1039/c4sc02491e] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [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: 08/15/2014] [Accepted: 09/28/2014] [Indexed: 12/27/2022] Open
Abstract
The aerobic reaction of the multidentate ligand 2,6-bis-(3-oxo-3-(2-hydroxyphenyl)-propionyl)-pyridine, H4L, with Co(ii) salts in strong basic conditions produces the clusters [Co4(L)2(OH)(py)7]NO3 (1) and [Co8Na4(L)4(OH)2(CO3)2(py)10](BF4)2 (2). Analysis of their structure unveils unusual coordination features including a very rare bridging pyridine ligand or two trapped carbonate anions within one coordination cage, forced to stay at an extremely close distance (dO···O = 1.946 Å). This unprecedented non-bonding proximity represents a meeting point between long covalent interactions and "intermolecular" contacts. These original motifs have been analysed here through DFT calculations, which have yielded interaction energies and the reduced repulsion energy experimented by both CO32- anions when located in close proximity inside the coordination cage.
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Affiliation(s)
- V Velasco
- Departament de Química Inorgànica , Universitat de Barcelona , Diagonal 645 , 08028 Barcelona , Spain . ; Tel: +34 934039760
| | - D Aguilà
- Departament de Química Inorgànica , Universitat de Barcelona , Diagonal 645 , 08028 Barcelona , Spain . ; Tel: +34 934039760
| | - L A Barrios
- Departament de Química Inorgànica , Universitat de Barcelona , Diagonal 645 , 08028 Barcelona , Spain . ; Tel: +34 934039760
| | - I Borilovic
- Departament de Química Inorgànica , Universitat de Barcelona , Diagonal 645 , 08028 Barcelona , Spain . ; Tel: +34 934039760
| | - O Roubeau
- Instituto de Ciencia de Materiales de Aragón (ICMA) , CSIC and Universidad de Zaragoza , Plaza San Francisco s/n , 50009 , Zaragoza , Spain
| | - J Ribas-Ariño
- Departament de Química Física and IQTCUB , Universitat de Barcelona , Diagonal 645 , 08028 Barcelona , Spain
| | - M Fumanal
- Departament de Química Física and IQTCUB , Universitat de Barcelona , Diagonal 645 , 08028 Barcelona , Spain
| | - S J Teat
- Advanced Light Source , Berkeley Laboratory , 1 Cyclotron Road , Berkeley , California 94720 , USA
| | - G Aromí
- Departament de Química Inorgànica , Universitat de Barcelona , Diagonal 645 , 08028 Barcelona , Spain . ; Tel: +34 934039760
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Velasco V, Pohl D, Surrey A, Bonatto-Minella A, Hernando A, Crespo P, Rellinghaus B. On the stability of AuFe alloy nanoparticles. Nanotechnology 2014; 25:215703. [PMID: 24784895 DOI: 10.1088/0957-4484/25/21/215703] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
AuFe nanoparticles with mean diameters d p = 13.2 nm have been prepared by inert-gas condensation. Conventional and high-resolution transmission electron microscopy and energy-dispersive x-ray spectroscopy investigations show that the particles are mostly icosahedra. Scanning transmission electron microscopy-energy-dispersive x-ray spectroscopy and scanning transmission electron microscopy-electron energy-loss spectroscopy show that the as-grown particles exhibit a core-shell structure. The shell is mainly composed of an amorphous FeO layer. Although Fe and Au are immiscible in the bulk, the particle cores are found to be homogeneously mixed at the atomic level with a local composition of around Au84Fe16 (at.%). AuFe nanoparticles exhibit a complex magnetic structure in which the core behaves as a spin glass with a freezing temperature of 35 K, whereas the amorphous FeO shell behaves as a ferro-ferrimagnetic system. On annealing above 300 °C, the AuFe icosahedra phases separate into their elemental constituents. Hence the as-grown AuFe icosahedra are metastable, thereby implying that the bulk phase diagram also applies for nanoscopic materials.
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Affiliation(s)
- V Velasco
- IFW Dresden, PO Box 270116, D-00171 Dresden, Germany. Instituto de Magnetismo Aplicado, UCM-ADIF-CSIC, PO Box 155, E-28230 Las Rozas, Spain. Departamento de Física de Materiales, Universidad Complutense de Madrid, E-28040 Madrid, Spain
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Jurado I, Rodríguez A, Vázquez C, Velasco V, Turrión V, Sánchez C. The Effect of C1 Esterase Inhibitor on Ischemic Reperfusion Injury in Rat Epigastric Skin Flaps: Preliminary Results. J Reconstr Microsurg 2014. [DOI: 10.1055/s-0034-1373959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Giraldo NA, Bolaños NI, Cuellar A, Roa N, Cucunubá Z, Rosas F, Velasco V, Puerta CJ, González JM. T lymphocytes from chagasic patients are activated but lack proliferative capacity and down-regulate CD28 and CD3ζ. PLoS Negl Trop Dis 2013; 7:e2038. [PMID: 23383358 PMCID: PMC3561132 DOI: 10.1371/journal.pntd.0002038] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Accepted: 12/14/2012] [Indexed: 12/13/2022] Open
Abstract
Background Chronic persistent infections have been associated with T lymphocytes functional impairment. The aim of this study was to compare the activation status, the proliferative potential and the expression of CD28 and CD3ζ chain on T lymphocytes between chronic chagasic patients and uninfected controls. Methodology/Principal Findings Forty-two chronic chagasic patients, 28 healthy individuals and 32 non-chagasic cardiomyopathy donors were included. Peripheral blood was marked for CD3, CD4, CD8, HLA-DR, CD28, CD38 and intracellular CD3ζ. Peripheral blood mononuclear cells were stained with carboxyfluorescein diacetate succinimidylester and incubated with T. cruzi lysate or phytohemagglutinin for five days. Cells from 3 healthy controls were incubated with T. cruzi trypomastigotes separated with transwells; and the expression of CD3ζ chain and proliferation index was determined. Heart-infiltrating cells from two chronic chagasic patients were tested for the aforementioned cellular markers. Chagasic patients displayed higher frequencies of CD4+/HLA-DR+/CD38+ (8.1%±6.1) and CD8+/HLA-DR+/CD38+ (19.8±8.9) T cells in comparison with healthy (1.6±1.0; 10.6±8.0) and non-chagasic cardiomyopathy donors (2.9±2.9; 5.8±6.8). Furthermore, the percentage of CD4+ activated T cells was higher in chagasic patients with cardiac involvement. CD8+ T cells proliferation index in chagasic donors (1.7±0.3) was lower when compared with healthy (2.3±0.3) and non-chagasic cardiomyopathy individuals (3.1±1.1). The frequencies of CD4+/CD28+ and CD8+/CD28+ T cells, as well as the CD3ζbright/CD3ζdim% ratios in CD4+ and CD8+ were lower in chagasic patients when compared with both control groups. The CD3ζbright/CD3ζdim% ratio and proliferative indexes for CD4+ and CD8+ T lymphocytes decreased gradually in those cells cultivated with parasites and displayed lower values than those incubated with medium alone. Finally, heart-infiltrating T cells from two T. cruzi infected patients also expressed activation markers and down-regulate CD28 and CD3ζ. Conclusions CD8+ T lymphocytes from chagasic donors displayed reduced proliferative capacity, which might be associated with CD3ζ down-regulation and diminished CD28 expression on CD4 T cells. In Chagas disease, caused by Trypanosoma cruzi, there is an acute onset from which most of the individuals recover if a competent immune response develops. Patients can remain asymptomatic (indeterminate) for many years, but near 30% can develop specific organ damage, mainly the heart. The pathogenesis of chronic Chagas cardiomyopathy is associated with parasite persistence, inadequate immune response and autoimmunity. Here we explored the bulk T cells response of chronic chagasic patients with and without cardiomyopathy, uninfected controls and patients with non-chagasic cardiomyopathy. T cells from chagasic donors expressed higher levels of activation markers, and their co-expression on CD4+ T cells distinguished those donors with or without cardiac damage. Mitogen-induced proliferation is highly impaired in the CD8+ T cells compartment, and interestingly activated CD8+ T cells are negatively correlated with the CD4+/CD28− population. The expression of the CD3ζ chain and CD28 was also diminished in chagasic patients. Furthermore, in vitro studies with blood mononuclear cells from uninfected donors showed that the indirect contact with live parasite decreased expression of CD3ζ chain and altered the T cell mitogen-induced proliferation. These results suggest a global impairment of the peripheral T cells response, which is probably associated with parasite persistence.
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Affiliation(s)
- Nicolás A. Giraldo
- Grupo de Ciencias Básicas Médicas, Facultad de Medicina, Universidad de los Andes, Bogotá, Colombia
| | - Natalia I. Bolaños
- Grupo de Ciencias Básicas Médicas, Facultad de Medicina, Universidad de los Andes, Bogotá, Colombia
| | - Adriana Cuellar
- Grupo de Inmunobiología y Biología Celular, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Nubia Roa
- Grupo de Trasplante, Facultad de Medicina, Pontificia Universidad Javeriana y Hospital Universitario San Ignacio, Bogotá, Colombia
| | - Zulma Cucunubá
- Grupo de Parasitología, Instituto Nacional de Salud, Bogotá, Colombia
| | | | | | - Concepción J. Puerta
- Laboratorio de Parasitología Molecular, Departamento de Microbiología, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - John M. González
- Grupo de Ciencias Básicas Médicas, Facultad de Medicina, Universidad de los Andes, Bogotá, Colombia
- * E-mail:
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Llavona Á, Prados A, Velasco V, Crespo P, Sánchez MC, Pérez L. Electrochemical synthesis and magnetic properties of goethite single crystal nanowires. CrystEngComm 2013. [DOI: 10.1039/c3ce26772e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lasso P, Mesa D, Bolaños N, Cuéllar A, Guzmán F, Cucunuba Z, Rosas F, Velasco V, Thomas MC, López MC, González JM, Puerta CJ. Chagasic patients are able to respond against a viral antigen from influenza virus. BMC Infect Dis 2012; 12:198. [PMID: 22920436 PMCID: PMC3511223 DOI: 10.1186/1471-2334-12-198] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Accepted: 08/13/2012] [Indexed: 12/13/2022] Open
Abstract
Background Trypanosoma cruzi, the etiological agent of Chagas’ disease, is an obligate intracellular parasite which induces a CD8+ T cell immune response with secretion of cytokines and release of cytotoxic granules. Although an immune-suppressive effect of T. cruzi on the acute phase of the disease has been described, little is known about the capacity of CD8+ T cell from chronic chagasic patients to respond to a non-T. cruzi microbial antigen. Methods In the present paper, the frequency, phenotype and the functional activity of the CD8+ T cells specific from Flu-MP*, an influenza virus epitope, were determined in 13 chagasic patients and 5 healthy donors. Results The results show that Flu-MP* peptide specific CD8+ T cells were found with similar frequencies in both groups. In addition, Flu-MP* specific CD8+ T cells were distributed in the early or intermediate/late differentiation stages without showing enrichment of a specific sub-population. The mentioned Flu-MP* specific CD8+ T cells from chagasic patients were predominately TEM (CCR7- CD62L-), producing IL-2, IFNγ, CD107a/b and perforin, and did not present significant differences when compared with those from healthy donors. Conclusions Our results support the hypothesis that there is no CD8+ T cell nonspecific immune-suppression during chronic Chagas disease infection. Nonetheless, other viral antigens must be studied in order to confirm our findings.
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Affiliation(s)
- Paola Lasso
- Laboratorio de Parasitología Molecular, Pontificia Universidad Javeriana, Bogotá, Colombia
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Jones N, Velasco V, Reault M, Dapremont V, Gastaldello B, Rouault A, Bonnet F, Debled M, Tunon de Lara C, Longy M, MacGrogan G, Sevenet N. PD10-04: Exploration of the Relationship between Loss of PTEN and BRCA1 Expression in Triple Negative Breast Carcinoma. Cancer Res 2011. [DOI: 10.1158/0008-5472.sabcs11-pd10-04] [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: 11/16/2022]
Abstract
Abstract
Based on the mechanism of action of PARP inhibitors, BRCAness breast and ovarian cancers could be defined as the optimal group of tumours to target with such drugs. As the BRCAness phenotype is not fully defined at present, a surrogate phenotype of triple negative breast cancer (TNBC) has been proposed. Results of recent clinical trials involving PARP inhibitors in the context of TNBC do not demonstrate a significant improvement in overall survival or progression free survival, partly due to the inaccurate selection of certain tumours. Data from cell culture studies suggests that loss of PTEN expression could be a marker of PARP inhibitor sensitivity.
Materials and Methods: A retrospective study of 160 TNBC resected at Institut Bergonie between 1989 and 2010 was undertaken. Inclusion criteria were: ER & PR immunohistochemcial (IHC) negativity (<10% tumour cells positive), non-amplification of HER2 (IHC score 0, 1, or 2 with negative FISH analysis) and an invasive ductal carcinoma resected before chemotherapy. For some familial cases, germline BRCA1 mutation screening had been performed in a diagnostic setting and was accompanied by genetic counselling. PTEN IHC, point mutation and gross rearrangement screening, along with BRCA1 expression and promoter methylation analysis (through real-time PCR and bisulfite treatment, respectively) and 53BP1 IHC were undertaken on this series of TNBC.
Results: Twenty percent of sporadic and familial TNBC demonstrated reduced BRCA1 expression with a greater than 7 fold reduction in expression. Almost half of tumours demonstrated a complete loss of PTEN expression as assessed by IHC, with a deleterious PTEN point mutation identified in 5% of cases. Although a slight correlation is observed between the complete loss of PTEN and a reduction in BRCA1 expression, a complete overlap of these two alterations was not observed; tumours with reduced BRCA1 expression do not always demonstrate complete negativity on PTEN IHC and certain tumours displaying complete negativity on PTEN IHC do not show a reduction in BRCA1 expression. Full immunohistochemical characterization of the tumour series (ER, PR, HER2, AR, CK5/6 & EGFR) together with the results of PTEN, BRCA1 and 53BP1 analyses will be presented. Conclusion
These results suggest that at present, loss of PTEN expression is not a suitable surrogate marker for tumours with reduced BRCA1 expression. This should be borne in mind for ancillary studies of clinical trials involving PARP inhibitors in the treatment of breast tumours and further investigation is warranted.
Citation Information: Cancer Res 2011;71(24 Suppl):Abstract nr PD10-04.
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Affiliation(s)
- N Jones
- 1Institut Bergonié, Bordeaux, France
| | - V Velasco
- 1Institut Bergonié, Bordeaux, France
| | - M Reault
- 1Institut Bergonié, Bordeaux, France
| | | | | | - A Rouault
- 1Institut Bergonié, Bordeaux, France
| | - F Bonnet
- 1Institut Bergonié, Bordeaux, France
| | - M Debled
- 1Institut Bergonié, Bordeaux, France
| | | | - M Longy
- 1Institut Bergonié, Bordeaux, France
| | | | - N Sevenet
- 1Institut Bergonié, Bordeaux, France
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Giraldo NA, Bolaños NI, Cuellar A, Guzman F, Uribe AM, Bedoya A, Olaya N, Cucunubá ZM, Roa N, Rosas F, Velasco V, Puerta CJ, González JM. Increased CD4+/CD8+ double-positive T cells in chronic Chagasic patients. PLoS Negl Trop Dis 2011; 5:e1294. [PMID: 21886854 PMCID: PMC3160296 DOI: 10.1371/journal.pntd.0001294] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Accepted: 07/19/2011] [Indexed: 01/08/2023] Open
Abstract
Background CD4+/CD8+ double positive (DP) T cells have been described in healthy individuals as well as in patients with autoimmune and chronic infectious diseases. In chronic viral infections, this cell subset has effector memory phenotype and displays antigen specificity. No previous studies of double positive T cells in parasite infections have been carried out. Methodology/Principal Findings Seventeen chronic chagasic patients (7 asymptomatic and 10 symptomatic) and 24 non-infected donors, including 12 healthy and 12 with non-chagasic cardiomyopathy donors were analyzed. Peripheral blood was stained for CD3, CD4, CD8, HLA-DR and CD38, and lymphocytes for intracellular perforin. Antigen specificity was assessed using HLA*A2 tetramers loaded with T. cruzi K1 or influenza virus epitopes. Surface expression of CD107 and intracellular IFN-γ production were determined in K1-specific DP T cells from 11 chagasic donors. Heart tissue from a chronic chagasic patient was stained for both CD8 and CD4 by immunochemistry. Chagasic patients showed higher frequencies of DP T cells (2.1%±0.9) compared with healthy (1.1%±0.5) and non-chagasic cardiomyopathy (1.2%±0.4) donors. DP T cells from Chagasic patients also expressed more HLA-DR, CD38 and perforin and had higher frequencies of T. cruzi K1-specific cells. IFN-γ production in K1-specific cells was higher in asymptomatic patients after polyclonal stimulation, while these cells tended to degranulate more in symptomatic donors. Immunochemistry revealed that double positive T cells infiltrate the cardiac tissue of a chagasic donor. Conclusions Chagasic patients have higher percentages of circulating double positive T cells expressing activation markers, potential effector molecules and greater class I antigenic specificity against T. cruzi. Although K1 tetramer positive DP T cell produced little IFN-γ, they displayed degranulation activity that was increased in symptomatic patients. Moreover, K1-specific DP T cells can migrate to the heart tissue. Chagas disease, produced by the blood parasite Trypanosoma cruzi, is considered a public health problem in Central and South America. Non sterile immunity can be achieved after acute infection. Parasite persistence can induce tissue damage in nearly 20% to 30% of chronically infected individuals. Indeed, chagasic cardiomyopathy is one of the consequences of the chronic infection. Antigen persistence and dysfunctional cellular immune response have been implicated in T. cruzi pathogenesis. Here, a higher frequency of circulating CD4+/CD8+ double positive T cells in chronic chagasic patients is reported as compared with non infected donors, including those with a non-chagasic cardiomyopathy. This cell subset also expressed more activation markers and stored more intracellular perforin. We have previously reported that CD8+ T cells from T. cruzi infected donors recognized the HLA-A*0201 restricted K1-peptide derived from the KMP-11 protein. Here, double positive T cells displayed higher percentages of recognition for the K1 peptide than single CD8+ T cells. These cells produce little IFN-γ, but display degranulation activity that was increased in the symptomatic group. Finally, double positive T cells can be localized in the heart tissue from a chronic chagasic donor.
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Affiliation(s)
- Nicolas A. Giraldo
- Grupo de Ciencias Básicas Médicas, Facultad de Medicina, Universidad de los Andes, Bogotá, Colombia
| | - Natalia I. Bolaños
- Grupo de Ciencias Básicas Médicas, Facultad de Medicina, Universidad de los Andes, Bogotá, Colombia
| | - Adriana Cuellar
- Grupo de Inmunobiología y Biología Celular, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Fanny Guzman
- Núcleo Biotecnología Curauma (NBC), Pontificia Universidad Católica de Valparaíso, Valparaiso, Chile
| | - Ana Maria Uribe
- Facultad de Medicina, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Astrid Bedoya
- Grupo de Infección y Cáncer, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
| | - Natalia Olaya
- Instituto de Patología, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
| | - Zulma M. Cucunubá
- Grupo de Parasitología, Instituto Nacional de Salud, Bogotá, Colombia
| | - Nubia Roa
- Facultad de Medicina, Pontificia Universidad Javeriana, Bogotá, Colombia
| | | | | | - Concepción J. Puerta
- Laboratorio de Parasitología Molecular, Departamento de Microbiología, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - John M. González
- Grupo de Ciencias Básicas Médicas, Facultad de Medicina, Universidad de los Andes, Bogotá, Colombia
- * E-mail:
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Carvajal A, Ortega PG, Sáinz M, Velasco V, Salado I, Martín Arias L, Eiros J, Pérez Rubio A, Castrodeza J. Adverse events associated with pandemic influenza vaccines: Comparison of the results of a follow-up study with those coming from spontaneous reporting. Vaccine 2011; 29:519-22. [DOI: 10.1016/j.vaccine.2010.10.067] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Revised: 10/19/2010] [Accepted: 10/22/2010] [Indexed: 10/18/2022]
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Lasso P, Mesa D, Cuéllar A, Guzmán F, Bolaños N, Rosas F, Velasco V, Thomas MDC, Lopez MC, Gonzalez JM, Puerta CJ. Frequency of specific CD8+ T cells for a promiscuous epitope derived from Trypanosoma cruzi KMP-11 protein in chagasic patients. Parasite Immunol 2010; 32:494-502. [PMID: 20591120 DOI: 10.1111/j.1365-3024.2010.01206.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The K1 peptide is a CD8(+)T cell HLA-A*0201-restricted epitope derived from the Trypanosoma cruzi KMP-11 protein. We have previously shown that this peptide induces IFN-gamma secretion by CD8(+)T cells. The aim of this study was to characterize the frequency of K1-specific CD8(+)T cells in chagasic patients. Nineteen HLA-A2(+)individuals were selected from 50 T. cruzi infected patients using flow cytometry and SSP-PCR assays. Twelve HLA-A*0201(+)noninfected donors were included as controls. Peripheral blood mononuclear cells were stained with HLA-A2-K1 tetramer, showing that 15 of 19 infected patients have K1-specific CD8(+)T cells (0.09-0.34% frequency) without differences in disease stages or severity. Of note, five of these responders were A*0205, A*0222, A*0226, A*0259 and A*0287 after molecular typing. Thus, a phenotypic and functional comparison of K1-specific CD8(+)T cells from non-HLA-A*0201 and HLA-A*0201(+)infected patients was performed. The results showed that both non-HLA-A*0201 and HLA-A*0201(+)individuals have a predominant effector memory CD8(+)T cell phenotype (CCR7-, CD62L-). Moreover, CD8(+)T cells from non-HLA-A*0201 and HLA-A*0201(+)individuals expressed IL-2, IFN-gamma and perforin without any differences. These findings support that K1 peptide is a promiscuous epitope presented by HLA-A2 supertype molecules and is highly recognized by chagasic patients.
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Affiliation(s)
- P Lasso
- Laboratorio de Parasitología Molecular, Pontificia Universidad Javeriana, Bogotá, Colombia
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Lasso P, Cuéllar A, Rosas F, Velasco V, Puerta C. Células dendríticas y linfocitos T reguladores naturales en pacientes con enfermedad crónica de Chagas. Infectio 2009. [DOI: 10.1016/s0123-9392(09)70155-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Flechas ID, Cuellar A, Cucunubá ZM, Rosas F, Velasco V, Steindel M, Thomas MDC, López MC, González JM, Puerta CJ. Characterising the KMP-11 and HSP-70 recombinant antigens' humoral immune response profile in chagasic patients. BMC Infect Dis 2009; 9:186. [PMID: 19939275 PMCID: PMC2789076 DOI: 10.1186/1471-2334-9-186] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2009] [Accepted: 11/25/2009] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Antigen specificity and IgG subclass could be significant in the natural history of Chagas' disease. The relationship between the different stages of human Chagas' disease and the profiles of total IgG and its subclasses were thus analysed here; they were directed against a crude T. cruzi extract and three recombinant antigens: the T. cruzi kinetoplastid membrane protein-11 (rKMP-11), an internal fragment of the T. cruzi HSP-70 protein 192-433, and the entire Trypanosoma rangeli HSP-70 protein. METHODS Seventeen Brazilian acute chagasic patients, 50 Colombian chronic chagasic patients (21 indeterminate and 29 cardiopathic patients) and 30 healthy individuals were included. Total IgG and its subtypes directed against the above-mentioned recombinant antigens were determined by ELISA tests. RESULTS The T. cruzi KMP-11 and T. rangeli HSP-70 recombinant proteins were able to distinguish both acute from chronic chagasic patients and infected people from healthy individuals. Specific antibodies to T. cruzi crude antigen in acute patients came from IgG3 and IgG4 subclasses whereas IgG1 and IgG3 were the prevalent isotypes in indeterminate and chronic chagasic patients. By contrast, the specific prominent antibodies in all disease stages against T. cruzi KMP-11 and T. rangeli HSP-70 recombinant antigens were the IgG1 subclass. CONCLUSION T. cruzi KMP-11 and the T. rangeli HSP-70 recombinant proteins may be explored together in the immunodiagnosis of Chagas' disease. Polarising the IgG1 subclass of the IgG response to T. cruzi KMP-11 and T. rangeli HSP-70 recombinant proteins could have important biological effects, taking into account that this is a complement fixing antibody.
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Affiliation(s)
- Ivonne D Flechas
- Laboratorio de Parasitología Molecular, Pontificia Universidad Javeriana, Cra, 7a No, 43-82, Ed, 50, Lab, 113, Bogotá, Colombia.
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Rosas F, Velasco V, Arboleda F, Santos H, Orjuela H, Sandoval N, Caicedo V, Correa J, Fontaine G. Catheter ablation of ventricular tachycardia in Chagasic Cardiomyopathy. Clin Cardiol 2009; 20:169-74. [PMID: 9034647 PMCID: PMC6655443 DOI: 10.1002/clc.4960200215] [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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
There is a limited experience with catheter ablation for treatment of ventricular tachycardia (VT) in Chagasic cardiomyopathy. A 30-year-old woman experienced episodes of palpitations and syncope due to attacks of VT. A diagnosis of Chagas disease was established on a biological basis. Two-dimensional echo and contrast ventriculography showed an apical aneurysm with thrombus. Surgery was indicated to resect the aneurysm and ablate the VT. Ventricular tachycardia recurred 1 month later despite therapy, including amiodarone. Two clinical frequent and well-tolerated tachycardias were identified. The site of origin was located in the right ventricular apex and in the apical-lateral wall of the left ventricle, respectively. Catheter ablation was performed at two sites with DC shocks (total energy 600 J) after unsuccessful radiofrequency ablation. Holter recordings performed during the post-operative period showed only infrequent extrasystoles. After follow-up of 24 months the patient remains asymptomatic. Drug-refractory VT in Chagasic cardiomyopathy can be ablated by medium-energy DC shocks after failure of radiofrequency ablation.
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Affiliation(s)
- F Rosas
- Department of Electrophysiology and Pacing, Colombian School of Medicine, University Clinic A. Shaio, Bogotà, Colombia
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Gaafar A, Garmendia MD, Miguel E, Velasco V, Ugalde A, Bilbao F, Petris GD, López J. Carcinoma urotelial plasmocitoide de vejiga urinaria: Estudio de 7 casos. Actas Urol Esp 2008. [DOI: 10.4321/s0210-48062008000800007] [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] [Indexed: 11/11/2022]
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Macgrogan G, Hostein I, Chibon F, Geneste G, Petersen M, Velasco V, De Mascarel I, Soubeyran I, Bui M, Coindre J, Parrens M, De Mascarel A, Belaud-Rotureau M, Idrissi Y, Turmot M, Merlio J, Bonnet J, Colotte M, Tuffet S. Accélération de la fixation par le micro-ondes : l’expérience bordelaise. Ann Pathol 2007. [DOI: 10.1016/s0242-6498(07)92881-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Díez H, Guzmán F, Alba MP, Cuéllar A, Thomas MC, López MC, Rosas F, Velasco V, González JM, Patarroyo ME, Puerta CJ. Immunological and structural characterization of an epitope from the Trypanosoma cruzi KMP-11 protein. Peptides 2007; 28:1520-6. [PMID: 17683828 DOI: 10.1016/j.peptides.2007.06.017] [Citation(s) in RCA: 12] [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: 05/07/2007] [Revised: 06/15/2007] [Accepted: 06/18/2007] [Indexed: 11/23/2022]
Abstract
The K1 peptide is an HLA-A*0201-restricted cytotoxic epitope derived from the Trypanosoma cruzi KMP-11 protein, this being the etiological agent of Chagas' disease. This work describes the K1 peptide's secondary structure and its recognition by sera from chagasic patients. Circular dichroism and NMR spectroscopy analysis revealed that the K1 peptide adopts an alpha-helical conformation. Fifty-six percent of individuals had anti-K1 and 86% anti-KMP-11 antibodies by ELISA in the chronic Chagas' group and 28 and 68% in the indeterminate Chagas' group, respectively. By contrast, no reactivity was observed in sera from healthy individuals and tuberculosis patients. Antibody response subclass specificity to the K1 peptide was IgG1 and IgG3. Taken together these results support the idea that the K1 peptide acts as a B-cell-inducer epitope during Chagas' disease.
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Affiliation(s)
- H Díez
- Laboratorio de Parasitología Molecular, Pontificia Universidad Javeriana, Bogotá, Colombia
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Maubec E, Duvillard P, Velasco V, Crickx B, Avril MF. Étude immuno-histochimique de l’expression de EGFR et HER-2 dans les mélanomes, les carcinomes de Merkel et les carcinomes épidermoïdes cutanés métastatiques. Ann Dermatol Venereol 2006; 133:274-6. [PMID: 16800183 DOI: 10.1016/s0151-9638(06)77555-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Hernández L, Hernández P, Velasco V. Carbon felt electrode design: application to phenol electrochemical determination by direct oxidation. Anal Bioanal Chem 2003; 377:262-6. [PMID: 12830358 DOI: 10.1007/s00216-003-2022-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2003] [Revised: 04/26/2003] [Accepted: 04/29/2003] [Indexed: 10/26/2022]
Abstract
In this paper, electrochemical behaviour of phenol in a carbon felt electrode is studied. An adsorption process on electrode surface that inhibits polymer formation after oxidation of phenol was confirmed. In this work we propose a phenol determination method based on direct electrochemical oxidation on carbon felt electrodes after an accumulation process.
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Affiliation(s)
- L Hernández
- Departamento de Química Analítica y Análisis Instrumental, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
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Gaspar N, Georger B, Velasco V, Laudani L, Morizet J, Terrier-Lacombe M, Grill J, Vassal G. CO32 SFRP Evaluation des recepteurs de la famille ERBP comme cible therapeutique dans les ependymones de l'enfant. Arch Pediatr 2003. [DOI: 10.1016/s0929-693x(03)90498-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Casanova C, Celli BR, Tost L, Soriano E, Abreu J, Velasco V, Santolaria F. Long-term controlled trial of nocturnal nasal positive pressure ventilation in patients with severe COPD. Chest 2000; 118:1582-90. [PMID: 11115443 DOI: 10.1378/chest.118.6.1582] [Citation(s) in RCA: 186] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
STUDY OBJECTIVES To determine the 1-year efficacy of noninvasive positive pressure ventilation (NPPV) added to long-term oxygen therapy (LTOT) in patients with stable severe COPD. PATIENT SELECTION AND METHODS: We prospectively randomized 52 patients with severe COPD (FEV(1) < 45%) to either NPPV plus "standard care" (96% patients with LTOT) or to standard care alone (93% patients with LTOT). The outcomes measured included the following: rate of acute COPD exacerbations; hospital admissions; intubations; and mortality at 3 months, 6 months, and 12 months. The patients were also evaluated at 3 months and 6 months for dyspnea using the Medical Research Council and Borg scales, gas exchange, hematocrit, pulmonary function, cardiac function with echocardiogram, and neuropsychological performance. RESULTS One-year survival was similar in both groups (78%). The number of acute exacerbations was similar at all time points in patients receiving NPPV, compared with control subjects. The number of hospital admissions was decreased at 3 months in the NPPV group (5% vs 15% of patients, p < 0.05), but this difference was not seen at 6 months (18% vs 19%, respectively). The only beneficial differences were observed in the Borg dyspnea rating, which dropped from 6 to 5 (p < 0.039), and in one of the neuropsychological tests (psychomotor coordination) for the NPPV group at 6 months. CONCLUSIONS Our study indicates that over 1 year, NPPV does not affect the natural course of the disease and is of marginal benefit in outpatients with severe COPD who are in stable condition.
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Affiliation(s)
- C Casanova
- Department of Pulmonary, Hospital La Candelaria, Department of Pulmonary and Internal Medicine, Hospital Universitario de Canarias, Tenerife, Spain
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Correu S, López Lizana S, Velasco V, Cervantes A. [Mechanism of action of intrauterine devices]. Ginecol Obstet Mex 1979; 45:419-28. [PMID: 540777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Cervantes A, Cervantes P, Correu S, Velasco V. [Secretion of growth hormone in men and women during the reproductive age, in aged men and menopausal women with or without estrogens or progesterone]. Ginecol Obstet Mex 1979; 45:185-98. [PMID: 540766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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