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Mangin PH, Onselaer MB, Receveur N, Le Lay N, Hardy AT, Wilson C, Sanchez X, Loyau S, Dupuis A, Babar AK, Miller JL, Philippou H, Hughes CE, Herr AB, Ariëns RA, Mezzano D, Jandrot-Perrus M, Gachet C, Watson SP. Immobilized fibrinogen activates human platelets through glycoprotein VI. Haematologica 2018; 103:898-907. [PMID: 29472360 PMCID: PMC5927996 DOI: 10.3324/haematol.2017.182972] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Accepted: 02/13/2018] [Indexed: 12/27/2022] Open
Abstract
Glycoprotein VI, a major platelet activation receptor for collagen and fibrin, is considered a particularly promising, safe antithrombotic target. In this study, we show that human glycoprotein VI signals upon platelet adhesion to fibrinogen. Full spreading of human platelets on fibrinogen was abolished in platelets from glycoprotein VI- deficient patients suggesting that fibrinogen activates platelets through glycoprotein VI. While mouse platelets failed to spread on fibrinogen, human-glycoprotein VI-transgenic mouse platelets showed full spreading and increased Ca2+ signaling through the tyrosine kinase Syk. Direct binding of fibrinogen to human glycoprotein VI was shown by surface plasmon resonance and by increased adhesion to fibrinogen of human glycoprotein VI-transfected RBL-2H3 cells relative to mock-transfected cells. Blockade of human glycoprotein VI with the Fab of the monoclonal antibody 9O12 impaired platelet aggregation on preformed platelet aggregates in flowing blood independent of collagen and fibrin exposure. These results demonstrate that human glycoprotein VI binds to immobilized fibrinogen and show that this contributes to platelet spreading and platelet aggregation under flow.
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Affiliation(s)
- Pierre H Mangin
- Université de Strasbourg, INSERM, EFS Grand-Est, BPPS UMR-S 1255, FMTS, France
| | - Marie-Blanche Onselaer
- Institute of Cardiovascular Sciences, IBR Building, College of Medical and Dental Sciences, University of Birmingham, UK
| | - Nicolas Receveur
- Université de Strasbourg, INSERM, EFS Grand-Est, BPPS UMR-S 1255, FMTS, France
| | - Nicolas Le Lay
- Université de Paris Diderot, INSERM UMR_S1148, Hôpital Bichat, Paris, France
| | - Alexander T Hardy
- Institute of Cardiovascular Sciences, IBR Building, College of Medical and Dental Sciences, University of Birmingham, UK
| | - Clare Wilson
- Thrombosis and Tissue Repair Group, Institute of Cardiovascular and Metabolic Medicine, University of Leeds, UK
| | - Ximena Sanchez
- Laboratorio de Hemostasia, Pontificia Universidad Catolica de Chile, Santiago, Chile
| | - Stéphane Loyau
- Université de Paris Diderot, INSERM UMR_S1148, Hôpital Bichat, Paris, France
| | - Arnaud Dupuis
- Université de Strasbourg, INSERM, EFS Grand-Est, BPPS UMR-S 1255, FMTS, France
| | - Amir K Babar
- Division of Immunobiology, Center for Systems Immunology & Division of Infectious Diseases, Cincinnati, OH, USA
| | - Jeanette Lc Miller
- Division of Immunobiology, Center for Systems Immunology & Division of Infectious Diseases, Cincinnati, OH, USA
| | - Helen Philippou
- Thrombosis and Tissue Repair Group, Institute of Cardiovascular and Metabolic Medicine, University of Leeds, UK
| | - Craig E Hughes
- Institute of Cardiovascular Sciences, IBR Building, College of Medical and Dental Sciences, University of Birmingham, UK.,Institute for Cardiovascular and Metabolic Research, Harborne Building, University of Reading, UK
| | - Andrew B Herr
- Division of Immunobiology, Center for Systems Immunology & Division of Infectious Diseases, Cincinnati, OH, USA
| | - Robert As Ariëns
- Thrombosis and Tissue Repair Group, Institute of Cardiovascular and Metabolic Medicine, University of Leeds, UK
| | - Diego Mezzano
- Laboratorio de Hemostasia, Pontificia Universidad Catolica de Chile, Santiago, Chile
| | - Martine Jandrot-Perrus
- Université de Paris Diderot, INSERM UMR_S1148, Hôpital Bichat, Paris, France.,Acticor Biotech, Hôpital Bichat, INSERM, UMR-S 1148, Paris, France
| | - Christian Gachet
- Université de Strasbourg, INSERM, EFS Grand-Est, BPPS UMR-S 1255, FMTS, France
| | - Steve P Watson
- Institute of Cardiovascular Sciences, IBR Building, College of Medical and Dental Sciences, University of Birmingham, UK .,Centre of Membrane Proteins and Receptors (COMPARE), Universities of Birmingham and Nottingham, Midlands, UK
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Balogun A, Armijos R, Weigel M, Cevallos W, Sanchez X, Puebla E, Rodriguez R. Epidemiology of Cutaneous Leishmaniasis in an Endemic Pacific Coastal
Rainforest Area of Ecuador. Ann Glob Health 2017. [DOI: 10.1016/j.aogh.2017.03.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Obeng-Gyasi E, Weigel M, Armijos R, Cevallos W, Sanchez X, Puebla E. Traditional and Conventional Treatment for Cutaneous Leishmaniasis in an
Endemic Rainforest Area of Northern Ecuador. Ann Glob Health 2017. [DOI: 10.1016/j.aogh.2017.03.358] [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: 10/19/2022] Open
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Wang Y, Armijos R, Weigel M, Balogun A, Sorocco T, Cevallos W, Sanchez X, Puebla E, Rodriguez R. Diagnosis of Cutaneous Leishmaniasis using Microscopic Detection and
Molecular-based PCR Assay Techniques. Ann Glob Health 2017. [DOI: 10.1016/j.aogh.2017.03.374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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McRae MP, Bozkurt B, Ballantyne CM, Sanchez X, Christodoulides N, Simmons G, Nambi V, Misra A, Miller CS, Ebersole JL, Campbell C, McDevitt JT. Cardiac ScoreCard: A Diagnostic Multivariate Index Assay System for Predicting a Spectrum of Cardiovascular Disease. Expert Syst Appl 2016; 54:136-147. [PMID: 31467464 PMCID: PMC6715313 DOI: 10.1016/j.eswa.2016.01.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Clinical decision support systems (CDSSs) have the potential to save lives and reduce unnecessary costs through early detection and frequent monitoring of both traditional risk factors and novel biomarkers for cardiovascular disease (CVD). However, the widespread adoption of CDSSs for the identification of heart diseases has been limited, likely due to the poor interpretability of clinically relevant results and the lack of seamless integration between measurements and disease predictions. In this paper we present the Cardiac ScoreCard-a multivariate index assay system with the potential to assist in the diagnosis and prognosis of a spectrum of CVD. The Cardiac ScoreCard system is based on lasso logistic regression techniques which utilize both patient demographics and novel biomarker data for the prediction of heart failure (HF) and cardiac wellness. Lasso logistic regression models were trained on a merged clinical dataset comprising 579 patients with 6 traditional risk factors and 14 biomarker measurements. The prediction performance of the Cardiac ScoreCard was assessed with 5-fold cross-validation and compared with reference methods. The experimental results reveal that the ScoreCard models improved performance in discriminating disease versus non-case (AUC = 0.8403 and 0.9412 for cardiac wellness and HF, respectively), and the models exhibit good calibration. Clinical insights to the prediction of HF and cardiac wellness are provided in the form of logistic regression coefficients which suggest that augmenting the traditional risk factors with a multimarker panel spanning a diverse cardiovascular pathophysiology provides improved performance over reference methods. Additionally, a framework is provided for seamless integration with biomarker measurements from point-of-care medical microdevices, and a lasso-based feature selection process is described for the down-selection of biomarkers in multimarker panels.
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Affiliation(s)
| | - Biykem Bozkurt
- Michael E. DeBakey VA Medical Center, Houston, TX, USA
- Section of Cardiology, Baylor College of Medicine, Houston, TX, USA
| | | | - Ximena Sanchez
- Department of Bioengineering, Rice University, Houston, TX, USA
- Department of Chemistry, Rice University, Houston, TX, USA
| | - Nicolaos Christodoulides
- Department of Bioengineering, Rice University, Houston, TX, USA
- Department of Chemistry, Rice University, Houston, TX, USA
| | - Glennon Simmons
- Department of Bioengineering, Rice University, Houston, TX, USA
- Department of Chemistry, Rice University, Houston, TX, USA
| | - Vijay Nambi
- Michael E. DeBakey VA Medical Center, Houston, TX, USA
- Section of Cardiology, Baylor College of Medicine, Houston, TX, USA
| | | | - Craig S. Miller
- Department of Oral Health Practice, Center for Oral Health Research, College of Dentistry University of Kentucky, Lexington, KY, USA
| | - Jeffrey L. Ebersole
- Department of Oral Health Practice, Center for Oral Health Research, College of Dentistry University of Kentucky, Lexington, KY, USA
| | - Charles Campbell
- Department of Cardiology, Erlanger Health System, Chattanooga, TN, USA
| | - John T. McDevitt
- Department of Bioengineering, Rice University, Houston, TX, USA
- Department of Chemistry, Rice University, Houston, TX, USA
- Corresponding author at: Department Biomaterials, New York University College of Dentistry, Bioengineering Institute, 433 First Avenue, Room 820, New York, NY 10010-4086, USA, , Phone: 212-998-9204
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Arcos E, Sanchez X, Toffoletto MC, Baeza M, Gazmuri P, Muñoz LA, Vollrath A. Social protection systems in vulnerable families: their importance for the public health. Rev Saude Publica 2014; 48:398-405. [PMID: 25119935 PMCID: PMC4203072 DOI: 10.1590/s0034-8910.2014048005131] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Accepted: 01/16/2014] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE To analyze the effectiveness of the Chilean System of Childhood Welfare in
transferring benefits to socially vulnerable families. METHODS A cross-sectional study with a sample of 132 families from the Metropolitan
Region, Chile, stratified according to degree of social vulnerability,
between September 2011 and January 2012. Semi-structured interviews were
conducted with mothers of the studied families in public health facilities
or their households. The variables studied were family structure,
psychosocial risk in the family context and integrated benefits from the
welfare system in families that fulfill the necessary requirements for
transfer of benefits. Descriptive statistics to measure location and
dispersion were calculated. A binary logistic regression, which accounts for
the sample size of the study, was carried out. RESULTS The groups were homogenous regarding family size, the presence of biological
father in the household, the number of relatives living in the same
dwelling, income generation capacity and the rate of dependency and
psychosocial risk (p ≥ 0.05). The transfer of benefits was low in all three
groups of the sample (≤ 23.0%). The benefit with the best coverage in the
system was the Single Family Subsidy, whose transfer was associated with the
size of the family, the presence of relatives in the dwelling, the absence
of the father in the household, a high rate of dependency and a high income
generation capacity (p ≤ 0.10). CONCLUSIONS The effectiveness of benefit transfer was poor, especially in families that
were extremely socially vulnerable. Further explanatory studies of benefit
transfers to the vulnerable population, of differing intensity and duration,
are required in order to reduce health disparities and inequalities.
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Affiliation(s)
- Estela Arcos
- Facultad de Enfermería., Universidad Andrés Bello, Santiago, Chile
| | - Ximena Sanchez
- Facultad de Ciencias Sociales, Universidad de Playa Ancha, Valparaíso, Chile
| | | | - Margarita Baeza
- Programa de Postgrado en Enfermería, Facultad de Enfermería, Universidad Andrés Bello, Santiago, Chile
| | - Patricia Gazmuri
- Facultad de Enfermería., Universidad Andrés Bello, Santiago, Chile
| | | | - Antonia Vollrath
- Facultad de Enfermería., Universidad Andrés Bello, Santiago, Chile
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Muñoz LA, Sanchez X, Arcos E, Vollrath A, Bonatti C. The motherhood experience in the context of social vulnerability: a comprehensive approach to social phenomenology. Rev Lat Am Enfermagem 2014; 21:913-9. [PMID: 23970228 DOI: 10.1590/s0104-11692013000400012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Accepted: 05/02/2013] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE to understand the future expectations and experience of vulnerable mothers from pregnancy to their child's early years. METHODS this qualitative study used the social phenomenology of Alfred Schütz as a framework. From January to April 2011, nine mothers from the 2009 program "Chile Grows with You" were interviewed at health centers in an urban Santiago de Chile community. RESULTS analysis of the "lived type" led to an understanding of the mothers' real-world experience. Unexpected pregnancies in extremely vulnerable mothers are associated with feelings of hopelessness then resignation. There is no plan for the future; the mother lives in the present with great uncertainty. CONCLUSIONS from the mothers' stories, significant patterns were identified in their experiences, yielding insights into society from these women's perspectives. For humanized, comprehensive nursing care, this expertise directs interventions designed to overcome despair in women excluded because of their invisibility and poverty.
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Arcos E, Muñoz LA, Sanchez X, Vollrath A, Gazmuri P, Baeza M. Effectiveness of the Comprehensive Childhood Protection System for vulnerable mothers and children. Rev Lat Am Enfermagem 2013; 21:1071-9. [PMID: 24142215 DOI: 10.1590/s0104-11692013000500009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Accepted: 04/22/2013] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVES To establish the effectiveness of the public benefits and services of the "Chile Grows with You" and "Protect Network" programs for socially vulnerable women and children in an urban community in the Metropolitan Region of Chile. METHOD Descriptive study employing a questionnaire. The sample consisted of 132 mothers and their 133 infants, all grouped according to social vulnerability. Primary data were collected via a structured interview of the mothers and were complemented with institutional (secondary) data. Descriptive and associative analyses were performed. RESULTS The perception of social vulnerability by the professionals was low at the time of admission into the program. The effectiveness of the universal and specific benefits was low, with better results for the children than for the mothers. However, no significant differences were observed according to vulnerability. Another finding was the low access to specific benefits for children with psychosocial risk and psychomotor delay, especially in the most vulnerable group. CONCLUSION The results revealed a gap in the access to the benefits guaranteed by law. To overcome this situation, nurses must strengthen their skills in contextualized health practices and the comprehensive administration of interdisciplinary and intersectoral networks.
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Affiliation(s)
- Estela Arcos
- Facultad de Enfermería, Universidad Andrés Bello, Santiago, Chile
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9
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Christodoulides N, Pierre FN, Sanchez X, Li L, Hocquard K, Patton A, Muldoon R, Miller CS, Ebersole JL, Redding S, Yeh CK, Furmaga WB, Wampler DA, Bozkurt B, Ballantyne CM, McDevitt JT. Programmable bio-nanochip technology for the diagnosis of cardiovascular disease at the point-of-care. Methodist Debakey Cardiovasc J 2012; 8:6-12. [PMID: 22891104 DOI: 10.14797/mdcj-8-1-6] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Cardiovascular disease remains the leading cause of death in the world and continues to serve as the major contributor to healthcare costs. Likewise, there is an ever-increasing need and demand for novel and more efficient diagnostic tools for the early detection of cardiovascular disease, especially at the point-of-care (POC). This article reviews the programmable bio-nanochip (P-BNC) system, a new medical microdevice approach with the capacity to deliver both high performance and reduced cost. This fully integrated, total analysis system leverages microelectronic components, microfabrication techniques, and nanotechnology to noninvasively measure multiple cardiac biomarkers in complex fluids, such as saliva, while offering diagnostic accuracy equal to laboratory-confined reference methods. This article profiles the P-BNC approach, describes its performance in real-world testing of clinical samples, and summarizes new opportunities for medical microdevices in the field of cardiac diagnostics.
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Chou J, Wong J, Christodoulides N, Floriano PN, Sanchez X, McDevitt J. Porous bead-based diagnostic platforms: bridging the gaps in healthcare. Sensors (Basel) 2012; 12:15467-99. [PMID: 23202219 PMCID: PMC3522972 DOI: 10.3390/s121115467] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2012] [Revised: 10/25/2012] [Accepted: 11/01/2012] [Indexed: 01/11/2023]
Abstract
Advances in lab-on-a-chip systems have strong potential for multiplexed detection of a wide range of analytes with reduced sample and reagent volume; lower costs and shorter analysis times. The completion of high-fidelity multiplexed and multiclass assays remains a challenge for the medical microdevice field; as it struggles to achieve and expand upon at the point-of-care the quality of results that are achieved now routinely in remote laboratory settings. This review article serves to explore for the first time the key intersection of multiplexed bead-based detection systems with integrated microfluidic structures alongside porous capture elements together with biomarker validation studies. These strategically important elements are evaluated here in the context of platform generation as suitable for near-patient testing. Essential issues related to the scalability of these modular sensor ensembles are explored as are attempts to move such multiplexed and multiclass platforms into large-scale clinical trials. Recent efforts in these bead sensors have shown advantages over planar microarrays in terms of their capacity to generate multiplexed test results with shorter analysis times. Through high surface-to-volume ratios and encoding capabilities; porous bead-based ensembles; when combined with microfluidic elements; allow for high-throughput testing for enzymatic assays; general chemistries; protein; antibody and oligonucleotide applications.
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Affiliation(s)
- Jie Chou
- Department of Bioengineering, Rice University, 6100 Main St MS-142, Houston, TX 77005, USA; E-Mails: (J.C.); (N.C.); (P.N.F.); (X.S.)
| | - Jorge Wong
- Department of Chemistry, University of Texas at Austin, 1 University Station A5300, Austin, TX 78712, USA; E-Mail:
| | - Nicolaos Christodoulides
- Department of Bioengineering, Rice University, 6100 Main St MS-142, Houston, TX 77005, USA; E-Mails: (J.C.); (N.C.); (P.N.F.); (X.S.)
- Department of Chemistry, Rice University, 6100 Main St MS-142, Houston, TX 77005, USA
| | - Pierre N. Floriano
- Department of Bioengineering, Rice University, 6100 Main St MS-142, Houston, TX 77005, USA; E-Mails: (J.C.); (N.C.); (P.N.F.); (X.S.)
- Department of Chemistry, Rice University, 6100 Main St MS-142, Houston, TX 77005, USA
| | - Ximena Sanchez
- Department of Bioengineering, Rice University, 6100 Main St MS-142, Houston, TX 77005, USA; E-Mails: (J.C.); (N.C.); (P.N.F.); (X.S.)
- Department of Chemistry, Rice University, 6100 Main St MS-142, Houston, TX 77005, USA
| | - John McDevitt
- Department of Bioengineering, Rice University, 6100 Main St MS-142, Houston, TX 77005, USA; E-Mails: (J.C.); (N.C.); (P.N.F.); (X.S.)
- Department of Chemistry, Rice University, 6100 Main St MS-142, Houston, TX 77005, USA
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Abstract
Pre-ascent climbing route visual inspection (route preview) has been suggested as a key climbing performance parameter although its role has never been verified experimentally. We examined the efficacy of this perceptual-cognitive skill on indoor sport climbing performance. Twenty-nine male climbers, divided into intermediate, advanced and expert climbing level groups, climbed two indoor sport routes matching their climbing level and, where applicable, routes below their climbing level. At each level, one route was climbed with a preview, where participants benefited from a 3-min pre-ascent climbing route visual inspection. Performance was assessed in terms of output (route completion) and form (number and duration of moves and stops). Route preview did not influence the output performance. Climbers using visual inspection were no more likely to finish the ascent than those without the option of using visual inspection. Conversely, route preview did influence form performance; climbers made fewer, and shorter stops during their ascent following a preview of the route. Form performances differences remained when baseline ability levels were taken into account, although for shorter duration of stops only with expert climbers benefiting most from route preview. The ability to visually inspect a climb before its ascent may represent an essential component of performance optimization.
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Affiliation(s)
- X Sanchez
- Department of Psychology, Faculty of Behavioural and Social Sciences, University of Groningen, Groningen, The Netherlands.
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Adler A, Sanchez X, Krey L, Grifo J. Chip-away: a novel method for conserving cryopreserved sperm. Fertil Steril 2009. [DOI: 10.1016/j.fertnstert.2009.07.1235] [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: 10/20/2022]
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Abstract
The purpose of the present study was to assess the relationship between pre-performance psychological states and expert performance in non-traditional sport competition. Nineteen elite male sport climbers (M=24.6, SD=4.0 years of age) completed the Competitive State Anxiety Inventory-2 and the Positive and Negative Affect Schedule before an international rock climbing competition. Climbing performances were video-recorded to calculate movement fluency (entropy) and obtain ascent times. Official route scores were also obtained. Successful climbers reported higher pre-performance levels of somatic anxiety and climbed the most difficult part of the route more slowly than their unsuccessful counterparts. The psychological states preceding elite climbing competition appeared to be an important factor in determining success, even when differences in baseline ability were taken into account.
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Affiliation(s)
- X Sanchez
- Department of Sport and Exercise Sciences, University of Chester, Chester, UK.
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Arola AM, Sanchez X, Murphy RT, Hasle E, Li H, Elliott PM, McKenna WJ, Towbin JA, Bowles NE. Mutations in PDLIM3 and MYOZ1 encoding myocyte Z line proteins are infrequently found in idiopathic dilated cardiomyopathy. Mol Genet Metab 2007; 90:435-40. [PMID: 17254821 DOI: 10.1016/j.ymgme.2006.12.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2006] [Revised: 12/12/2006] [Accepted: 12/13/2006] [Indexed: 12/13/2022]
Abstract
Dilated cardiomyopathy (DCM), characterized by ventricular dilation and decreased systolic function, is estimated to be of genetic origin in up to 50% of cases. In the present study, we investigated the role of two genes, encoding the Z line proteins PDZ and LIM domain protein 3 (PDLIM3) and myozenin-1 (MYOZ1), in the etiology of DCM. The coding regions of PDLIM3 and MYOZ1 were first amplified from the genomic DNA of 185 unrelated DCM patients by polymerase chain reaction (PCR), followed by denaturing high-performance liquid chromatography (DHPLC) analysis. The samples that exhibited abnormal peaks on DHPLC were re-amplified, purified and sequenced using a Big-Dye Terminator cycle sequencing system. Interestingly, a 2-bp insertion (178insCA) in exon 2 of PDLIM3 was identified in one patient who presented with DCM during pregnancy and died a year later awaiting heart transplant. No other significant mutations were found in either PDLIM3 or MYOZ1. The mutation probably resulted in an unstable protein, since no exogenous protein could be detected in transfected murine myoblastoid cells by immunohistochemical or Western blot analyses. We conclude that mutations in PDLIM3 and MYOZ1, encoding myocyte Z line proteins, do not play any significant role in the genetic etiology of idiopathic DCM. The exact mechanism by which the mutation identified in the present study is linked to DCM phenotype remains unknown. The hemodynamic burden of pregnancy and/or other genetic or environmental factors could have precipitated heart failure symptoms in an individual with defective myocardial cytoarchitecture.
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Affiliation(s)
- Anita M Arola
- Department of Pediatrics, Section of Cardiology, Baylor College of Medicine, Houston, TX, USA.
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15
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Barton S, Keegan B, Sanchez X, Krey L, Grifo J. P-596. Fertil Steril 2006. [DOI: 10.1016/j.fertnstert.2006.07.968] [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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Lu CW, Lin JH, Rajawat YS, Jerng H, Rami TG, Sanchez X, DeFreitas G, Carabello B, DeMayo F, Kearney DL, Miller G, Li H, Pfaffinger PJ, Bowles NE, Khoury DS, Towbin JA. Functional and clinical characterization of a mutation in KCNJ2 associated with Andersen-Tawil syndrome. J Med Genet 2006; 43:653-9. [PMID: 16571646 PMCID: PMC2564587 DOI: 10.1136/jmg.2006.040816] [Citation(s) in RCA: 27] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND Andersen-Tawil syndrome (ATS) is a rare inherited disorder, characterised by periodic paralysis, cardiac dysarrhythmias, and dysmorphic features, and is caused by mutations in the gene KCNJ2, which encodes the inward rectifier potassium channel, Kir2.1. This study sought to analyse KCNJ2 in patients with familial ATS and to determine the functional characteristics of the mutated gene. METHODS AND RESULTS We screened a family with inherited ATS for the mutation in KCNJ2, using direct DNA sequencing. A missense mutation (T75R) of Kir2.1, located in the highly conserved cytoplasmic N-terminal domain, was identified in three affected members of this family. Using the Xenopus oocyte expression system and whole cell voltage clamp analyses, we found that the T75R mutant was non-functional and possessed a strong dominant negative effect when co-expressed with the same amount of wild type Kir2.1. Transgenic (Tg) mice expressing the mutated form of Kir2.1 in the heart had prolonged QTc intervals compared with mice expressing the wild type protein. Ventricular tachyarrhythmias were observed in 5 of 14 T75R-Tg mice compared with 1 of 7 Wt-Tg and none of 6 non-transgenic littermates. In three of five T75R-Tg mice with ventricular tachycardia, their ECG disclosed bidirectional tachycardia as in our proband. CONCLUSIONS The in vitro studies revealed that the T75R mutant of Kir2.1 had a strong dominant negative effect in the Xenopus oocyte expression system. It still preserved the ability to co-assemble and traffic to the cell membrane in mammalian cells. For in vivo studies, the T75R-Tg mice had bidirectional ventricular tachycardia after induction and longer QT intervals.
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Affiliation(s)
- C-W Lu
- Department of Pediatrics, Shin Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan
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Meurs KM, Sanchez X, David RM, Bowles NE, Towbin JA, Reiser PJ, Kittleson JA, Munro MJ, Dryburgh K, Macdonald KA, Kittleson MD. A cardiac myosin binding protein C mutation in the Maine Coon cat with familial hypertrophic cardiomyopathy. Hum Mol Genet 2005; 14:3587-93. [PMID: 16236761 DOI: 10.1093/hmg/ddi386] [Citation(s) in RCA: 145] [Impact Index Per Article: 7.6] [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: 11/12/2022] Open
Abstract
Hypertrophic cardiomyopathy (HCM) is one of the most common causes of sudden cardiac death in young adults and is a familial disease in at least 60% of cases. Causative mutations have been identified in several sarcomeric genes, including the myosin binding protein C (MYBPC3) gene. Although numerous causative mutations have been identified, the pathogenetic process is still poorly understood. A large animal model of familial HCM in the cat has been identified and may be used for additional study. As the first spontaneous large animal model of this familial disease, feline familial HCM provides a valuable model for investigators to evaluate pathophysiologic processes and therapeutic (pharmacologic or genetic) manipulations. The MYBPC3 gene was chosen as a candidate gene in this model after identifying a reduction in the protein in myocardium from affected cats in comparison to control cats (P<0.001). DNA sequencing was performed and sequence alterations were evaluated for evidence that they changed the amino acid produced, that the amino acid was conserved and that the protein structure was altered. We identified a single base pair change (G to C) in the feline MYBPC3 gene in affected cats that computationally alters the protein conformation of this gene and results in sarcomeric disorganization. We have identified a causative mutation in the feline MYBPC3 gene that results in the development of familial HCM. This is the first report of a spontaneous mutation causing HCM in a non-human species. It should provide a valuable model for evaluating pathophysiologic processes and therapeutic manipulations.
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Affiliation(s)
- Kathryn M Meurs
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA.
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Vatta M, Mohapatra B, Jimenez S, Sanchez X, Bowles N, Bowles K, Towbin JA. Reply. J Am Coll Cardiol 2004. [DOI: 10.1016/j.jacc.2004.06.008] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kenton AB, Sanchez X, Coveler KJ, Makar KA, Jimenez S, Ichida F, Murphy RT, Elliott PM, McKenna W, Bowles NE, Towbin JA, Bowles KR. Isolated left ventricular noncompaction is rarely caused by mutations in G4.5, alpha-dystrobrevin and FK Binding Protein-12. Mol Genet Metab 2004; 82:162-6. [PMID: 15172004 DOI: 10.1016/j.ymgme.2004.02.009] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2004] [Accepted: 02/27/2004] [Indexed: 10/26/2022]
Abstract
Isolated left ventricular noncompaction (LVNC) is a form of cardiomyopathy that most commonly presents in infancy with a hypertrophic and dilated left ventricle characterized by deep trabeculations and intertrabecular recesses. Our goal was to determine the frequency of mutations in G4.5, alpha-dystrobrevin, and FK Binding protein-12 in isolated LVNC patients. No mutations were identified in 47 of the 48 patients studied, while a splice site acceptor site mutation of intron 10 of G4.5 was identified in one patient, resulting in the deletion of exon 10 from the mRNA.
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Affiliation(s)
- Alexander B Kenton
- Department of Pediatrics, Section of Neonatology, Baylor College of Medicine, Houston, TX, USA
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Vatta M, Mohapatra B, Jimenez S, Sanchez X, Faulkner G, Perles Z, Sinagra G, Lin JH, Vu TM, Zhou Q, Bowles KR, Di Lenarda A, Schimmenti L, Fox M, Chrisco MA, Murphy RT, McKenna W, Elliott P, Bowles NE, Chen J, Valle G, Towbin JA. Mutations in Cypher/ZASPin patients with dilated cardiomyopathy and left ventricular non-compaction. J Am Coll Cardiol 2003; 42:2014-27. [PMID: 14662268 DOI: 10.1016/j.jacc.2003.10.021] [Citation(s) in RCA: 352] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVES We evaluated the role of Cypher/ZASP in the pathogenesis of dilated cardiomyopathy (DCM) with or without isolated non-compaction of the left ventricular myocardium (INLVM). BACKGROUND Dilated cardiomyopathy, characterized by left ventricular dilation and systolic dysfunction with signs of heart failure, is genetically transmitted in 30% to 40% of cases. Genetic heterogeneity has been identified with mutations in multiple cytoskeletal and sarcomeric genes causing the phenotype. In addition, INLVM with a hypertrophic dilated left ventricle, ventricular dysfunction, and deep trabeculations, is also inherited, and the genes identified to date differ from those causing DCM. Cypher/ZASP is a newly identified gene encoding a protein that is a component of the Z-line in both skeletal and cardiac muscle. METHODS Diagnosis of DCM was performed by echocardiogram, electrocardiogram, and physical examination. In addition, levels of the muscular isoform of creatine kinase were measured to evaluate for skeletal muscle involvement. Cypher/ZASP was screened by denaturing high performance liquid chromatography (DHPLC) and direct deoxyribonucleic acid sequencing. RESULTS We identified and screened 100 probands with left ventricular dysfunction. Five mutations in six probands (6% of cases) were identified in patients with familial or sporadic DCM or INLVM. In vitro studies showed cytoskeleton disarray in cells transfected with mutated Cypher/ZASP. CONCLUSIONS These data suggest that mutated Cypher/ZASP can cause DCM and INLVM and identify a mechanistic basis.
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Affiliation(s)
- Matteo Vatta
- Department of Pediatrics (Cardiology), Baylor College of Medicine, Houston, Texas, USA
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Sanchez X, Suetomi K, Cousins-Hodges B, Horton JK, Navarro J. CXC chemokines suppress proliferation of myeloid progenitor cells by activation of the CXC chemokine receptor 2. J Immunol 1998; 160:906-10. [PMID: 9551928] [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] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
IL-8 is one of the major mediators of the transendothelial migration of neutrophils from the circulation to the site of injury and infection. In this work we demonstrate that the CXC or alpha-chemokines, IL-8 and melanoma growth stimulatory activity (MGSA) induce myeloid suppression via direct action on progenitor cells, mediated by activation of the murine homologue of the CXC chemokine receptor-2 (CXCR2) or IL-8R B. We first show that proliferation of the IL-3-dependent murine myeloid progenitor cell line 32D is suppressed by human IL-8 and the functionally and structurally related peptide, MGSA. Second, we show for the first time the high endogenous expression of the murine CXCR2 in 32D cells, as demonstrated by Northern blot analysis, binding to [125I]macrophage inflammatory protein-2, and macrophage inflammatory protein-2-induced calcium responses in 32D cells. Third, we demonstrate that IL-8 and MGSA induce a rise in intracellular calcium in 32D cells. The IL-8-induced Ca2+ response is desensitizing, since a second dose of IL-8 did not trigger a second calcium response. Other chemokines, including neutrophil-activating protein-2, platelet factor-4, RANTES, and macrophage chemotactic protein-1, neither suppressed the proliferation of 32D cells nor induced a rise in intracellular calcium. Finally, the IC50 of IL-8- and MGSA-dependent suppression of proliferation of 32D cells is in good agreement with the EC50 of IL-8- and MGSA-dependent activation of neutrophil Mac-1 up-regulation and chemotaxis. Our studies are consistent with the idea that IL-8 and MGSA suppress the proliferation of 32D cells by activation of murine CXCR2.
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Affiliation(s)
- X Sanchez
- Department of Physiology and Biophysics, Sealy Center for Molecular Science, University of Texas Medical Branch, Galveston 77555-0641, USA
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Sanchez X, Suetomi K, Cousins-Hodges B, Horton JK, Navarro J. CXC Chemokines Suppress Proliferation of Myeloid Progenitor Cells by Activation of the CXC Chemokine Receptor 2. The Journal of Immunology 1998. [DOI: 10.4049/jimmunol.160.2.906] [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] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
IL-8 is one of the major mediators of the transendothelial migration of neutrophils from the circulation to the site of injury and infection. In this work we demonstrate that the CXC or α-chemokines, IL-8 and melanoma growth stimulatory activity (MGSA) induce myeloid suppression via direct action on progenitor cells, mediated by activation of the murine homologue of the CXC chemokine receptor-2 (CXCR2) or IL-8R B. We first show that proliferation of the IL-3-dependent murine myeloid progenitor cell line 32D is suppressed by human IL-8 and the functionally and structurally related peptide, MGSA. Second, we show for the first time the high endogenous expression of the murine CXCR2 in 32D cells, as demonstrated by Northern blot analysis, binding to [125I]macrophage inflammatory protein-2, and macrophage inflammatory protein-2-induced calcium responses in 32D cells. Third, we demonstrate that IL-8 and MGSA induce a rise in intracellular calcium in 32D cells. The IL-8-induced Ca2+ response is desensitizing, since a second dose of IL-8 did not trigger a second calcium response. Other chemokines, including neutrophil-activating protein-2, platelet factor-4, RANTES, and macrophage chemotactic protein-1, neither suppressed the proliferation of 32D cells nor induced a rise in intracellular calcium. Finally, the IC50 of IL-8- and MGSA-dependent suppression of proliferation of 32D cells is in good agreement with the EC50 of IL-8- and MGSA-dependent activation of neutrophil Mac-1 up-regulation and chemotaxis. Our studies are consistent with the idea that IL-8 and MGSA suppress the proliferation of 32D cells by activation of murine CXCR2.
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Affiliation(s)
- Ximena Sanchez
- Department of Physiology and Biophysics and the Sealy Center for Molecular Science, University of Texas Medical Branch, Galveston, TX 77555
| | - Katsutoshi Suetomi
- Department of Physiology and Biophysics and the Sealy Center for Molecular Science, University of Texas Medical Branch, Galveston, TX 77555
| | - Beth Cousins-Hodges
- Department of Physiology and Biophysics and the Sealy Center for Molecular Science, University of Texas Medical Branch, Galveston, TX 77555
| | - Julie K. Horton
- Department of Physiology and Biophysics and the Sealy Center for Molecular Science, University of Texas Medical Branch, Galveston, TX 77555
| | - Javier Navarro
- Department of Physiology and Biophysics and the Sealy Center for Molecular Science, University of Texas Medical Branch, Galveston, TX 77555
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Abstract
Chemokines are cytokines that activate and induce the migration of leukocytes. Stroma-derived factor-1 (SDF-1) is a novel chemokine that blocks the entry of T-tropic HIV-1 mediated by fusin/CXCR4/LESTR (leukocyte-derived seven-transmembrane domain receptor). In this work we demonstrate that SDF-1 triggers increases in intracellular calcium and inhibits the proliferation of myeloid progenitor cell line 32D. By contrast, SDF-1 neither triggers a calcium response nor affects the proliferation of the myeloid progenitor cell line 32D-GR that is deficient in CXCR4. Responsiveness to SDF-1 was rescued by transfection of 32D-GR cells with a cDNA encoding the human CXCR4. The data indicate that SDF-1 induces myelosuppression by activation of CXCR4. The constitutive production of SDF-1 by bone marrow stromal cells argues for a major role of SDF-1 on the regulation of myelopoiesis.
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Affiliation(s)
- X Sanchez
- Department of Physiology & Biophysics and Sealy Center for Molecular Science, University of Texas Medical Branch, Galveston, Texas 77555, USA
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Abstract
Effects of mental rehearsal were assessed on two measures of table tennis performance, counterattack forehand and counterattack backhand. Mental rehearsal combined with observational and physical techniques (N = 40) appeared to improve table tennis performance both qualitatively and quantitatively. Correlations suggested mental training effects cannot be explained only in terms of visual imagery.
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Affiliation(s)
- M Lejeune
- Laboratory of Experimental Psychology, University of Liege, Belgium
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