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Guevara-Fujita ML, Huaman-Dianderas F, Obispo D, Sánchez R, Barrenechea V, Rojas-Málaga D, Estrada-Cuzcano A, Trubnykova M, Cornejo-Olivas M, Marca V, Gallardo B, Dueñas-Roque M, Protzel A, Castañeda C, Abarca H, Celis L, La Serna-Infantes J, Fujita R. MLPA followed by target-NGS to detect mutations in the dystrophin gene of Peruvian patients suspected of DMD/DMB. Mol Genet Genomic Med 2021; 9:e1759. [PMID: 34327855 PMCID: PMC8457708 DOI: 10.1002/mgg3.1759] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 05/09/2021] [Accepted: 07/08/2021] [Indexed: 11/11/2022] Open
Abstract
Background We report the molecular analysis of the DMD gene in a group of Peruvian patients with Duchenne/Becker dystrophinopathy. This is the first study to thoroughly characterize mutations in this population. Methods We used the combination of multiplex ligation‐dependent probe amplification (MLPA) and sequencing analysis of the DMD gene. We recruited Peruvian patients in 2 years from reference national hospitals. We performed DNA tests in 152 patients, checking first exon deletion/duplication by MLPA, and subsequently, if negative, samples were sequenced to detect point mutations. Results The average age for diagnosis was 9.8 years, suggesting a delay for timely diagnosis and care. We found causal DMD mutations in 125 patients: 72 (57.6%) exon deletions/duplications (41.6% deletions, 16.0% duplications), and 53 (42.4%) point mutations (27.2% nonsense, 9.6% small indels, and 5.6% splice site). Conclusion Due to our genetic background, we expected a higher number of novel and recurrent causal mutations in our sample. Results showed 16% of novel mutations, similar to other well‐studied populations.
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Affiliation(s)
- María Luisa Guevara-Fujita
- Centro de Genética y Biología Molecular, Instituto de Investigación, Facultad de Medicina Humana, Universidad de San Martín de Porres, Lima, Peru
| | - Francia Huaman-Dianderas
- Centro de Genética y Biología Molecular, Instituto de Investigación, Facultad de Medicina Humana, Universidad de San Martín de Porres, Lima, Peru
| | - Daisy Obispo
- Centro de Genética y Biología Molecular, Instituto de Investigación, Facultad de Medicina Humana, Universidad de San Martín de Porres, Lima, Peru
| | - Rodrigo Sánchez
- Centro de Genética y Biología Molecular, Instituto de Investigación, Facultad de Medicina Humana, Universidad de San Martín de Porres, Lima, Peru
| | - Victor Barrenechea
- Centro de Genética y Biología Molecular, Instituto de Investigación, Facultad de Medicina Humana, Universidad de San Martín de Porres, Lima, Peru
| | - Diana Rojas-Málaga
- Centro de Genética y Biología Molecular, Instituto de Investigación, Facultad de Medicina Humana, Universidad de San Martín de Porres, Lima, Peru.,Laboratório de Genética Molecular, Serviço de Genética Médica, Hospital de Clínicas de Porto Alegre, Rio Grande do Sul, Brazil
| | - Alejandro Estrada-Cuzcano
- Centro de Genética y Biología Molecular, Instituto de Investigación, Facultad de Medicina Humana, Universidad de San Martín de Porres, Lima, Peru.,Paris-Saclay Institute of Neuroscience, CERTO-Retina France, CNRS, Université Paris-Saclay, Orsay, 91405, France
| | - Milana Trubnykova
- Servicio de Genética y Errores Innatos del Metabolismo del Instituto Nacional de Salud del Niño, Lima, Peru
| | - Mario Cornejo-Olivas
- Neurogenetics Research Center, Instituto Nacional de Ciencias Neurológicas, Lima, Peru.,Center for Global Health, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Victoria Marca
- Neurogenetics Research Center, Instituto Nacional de Ciencias Neurológicas, Lima, Peru
| | - Bertha Gallardo
- Servicio de Genética y Errores Innatos del Metabolismo del Instituto Nacional de Salud del Niño, Lima, Peru
| | | | - Ana Protzel
- Hospital Nacional Edgardo Rebagliati Martins, EsSalud, Lima, Peru
| | | | - Hugo Abarca
- Servicio de Genética y Errores Innatos del Metabolismo del Instituto Nacional de Salud del Niño, Lima, Peru
| | - Luis Celis
- Servicio de Genética, Instituto de Salud del Niño San Borja, Lima, Peru
| | | | - Ricardo Fujita
- Centro de Genética y Biología Molecular, Instituto de Investigación, Facultad de Medicina Humana, Universidad de San Martín de Porres, Lima, Peru
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Vargas A, Rojas J, Aivasovsky I, Vergara S, Castellanos M, Prieto C, Celis L. Progressive Early-Onset Leukodystrophy Related to Biallelic Variants in the KARS Gene: The First Case Described in Latin America. Genes (Basel) 2020; 11:genes11121437. [PMID: 33260297 PMCID: PMC7759888 DOI: 10.3390/genes11121437] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 11/11/2020] [Revised: 11/26/2020] [Accepted: 11/26/2020] [Indexed: 12/12/2022] Open
Abstract
The KARS gene encodes the aminoacyl-tRNA synthetase (aaRS), which activates and joins the lysin with its corresponding transfer RNA (tRNA) through the ATP-dependent aminoacylation of the amino acid. KARS gene mutations have been linked to diverse neurologic phenotypes, such as neurosensorial hearing loss, leukodystrophy, microcephaly, developmental delay or regression, peripheral neuropathy, cardiomyopathy, the impairment of the mitochondrial respiratory chain, and hyperlactatemia, among others. This article presents the case of a Colombian pediatric patient with two pathological missense variants in a compound heterozygous state in the KARS gene and, in addition to the case report, the paper reviews the literature for other cases of KARS1-associated leukodystrophy.
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Affiliation(s)
- Adriana Vargas
- Clínica Universidad de La Sabana, Km 7, Autopista Norte de Bogotá, Chía 250001, Colombia
- Correspondence: (A.V.); (I.A.); Tel.: +1-647-238-4827 (A.V.); +57-304-342-1616 (I.A.)
| | - Jorge Rojas
- Faculty of Medicine, Pontificia Universidad Javeriana, Cra 7a N° 40 B-36, Bogotá 110231, Colombia;
| | - Ivan Aivasovsky
- Faculty of Medicine, Universidad de La Sabana, Km 7, Autopista Norte de Bogotá, Chía 250001, Colombia; (S.V.); (M.C.); (C.P.); (L.C.)
- Correspondence: (A.V.); (I.A.); Tel.: +1-647-238-4827 (A.V.); +57-304-342-1616 (I.A.)
| | - Sergio Vergara
- Faculty of Medicine, Universidad de La Sabana, Km 7, Autopista Norte de Bogotá, Chía 250001, Colombia; (S.V.); (M.C.); (C.P.); (L.C.)
| | - Marianna Castellanos
- Faculty of Medicine, Universidad de La Sabana, Km 7, Autopista Norte de Bogotá, Chía 250001, Colombia; (S.V.); (M.C.); (C.P.); (L.C.)
| | - Carolina Prieto
- Faculty of Medicine, Universidad de La Sabana, Km 7, Autopista Norte de Bogotá, Chía 250001, Colombia; (S.V.); (M.C.); (C.P.); (L.C.)
| | - Luis Celis
- Faculty of Medicine, Universidad de La Sabana, Km 7, Autopista Norte de Bogotá, Chía 250001, Colombia; (S.V.); (M.C.); (C.P.); (L.C.)
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Contreras S, Rodríguez D, Vera F, Balcells ME, Celis L, Legarraga P, Román JC, García P. [Identification of mycobacteria species through mass spectrometry (MALDI-TOF)]. Rev Chilena Infectol 2020; 37:252-256. [PMID: 32853316 DOI: 10.4067/s0716-10182020000300252] [Citation(s) in RCA: 1] [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: 05/03/2019] [Accepted: 11/19/2019] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Mycobacterial diseases are very important both clinically and epidemiologically. Mycobacterium tuberculosis complex (MTBc) infections confer higher morbidity and mortality rate than non-tuberculous mycobacteria (NTM) infections. Traditional species identification techniques are based on phenotypic characteristics which take a long time by laborious processes and in occasions are no conclusive. Currently, most used techniques are based on molecular methods, which are accurate but are expensive and complex. Matrix Assisted Laser Desorption/Ionization Time-of-Flight mass spectrometry (MALDI-TOF MS) is a simple, cheap and fast identification method based on comparing protein spectra with a reference database. AIM To assess the performance of MALDI-TOF MS in the identification of MTBc and NTM, compared with molecular methods. METHODS For that purpose, 28 isolates of 9 different species were analyzed through MALDI-TOF MS. RESULTS 78.5% (22/28) of isolates were correctly identified, 100% (9/9) of rapidly growers NTM, 60% (9/15) of slow growing NTM and 100% (4/4) of MTBc. Every unidentified isolate (6/6) corresponded to M. avium/intracellulare complex. CONCLUSION MALDI-TOF MS is fast, simple and cheaper than molecular methods and also has adequate accuracy.
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Affiliation(s)
- Samuel Contreras
- Laboratorio de Microbiología, Servicio de Laboratorios Clínicos, Red de Salud UC-CHRISTUS, Santiago, Chile
| | - David Rodríguez
- Departamento de Laboratorios Clínicos, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Francisco Vera
- Departamento de Laboratorios Clínicos, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - María Elvira Balcells
- Departamento de Enfermedades Infecciosas del Adulto, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Luis Celis
- Laboratorio de Microbiología, Servicio de Laboratorios Clínicos, Red de Salud UC-CHRISTUS, Santiago, Chile
| | - Paulette Legarraga
- Departamento de Laboratorios Clínicos, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Juan Carlos Román
- Laboratorio de Microbiología, Servicio de Laboratorios Clínicos, Red de Salud UC-CHRISTUS, Santiago, Chile
| | - Patricia García
- Departamento de Laboratorios Clínicos, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
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Palafox ML, Celis L, del Socorro Camarillo Romero M, Russi A, Hinojosa Juárez AC, Almonacid Urrego CC, Romero EC, Zerón HM. Identification of metabolic indicators for cardiovascular risk in schoolchildren. Rocz Panstw Zakl Hig 2019; 70:89-96. [PMID: 30837750 DOI: 10.32394/rpzh.2019.0058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 11/19/2022] Open
Abstract
Objective CardioVascular Disease (CVD) is one of the most important causes of death worldwide affecting people at younger ages every year. The purpose of this study was to identify the metabolic indicators for cardiovascular risk factors in primary school students from Mexico and Colombia. Methods A clinical, prospective, cross-sectional and comparative study was conducted in Mexico and Colombia to contrast anthropometric measurements, biochemical and dietetic determinations and physical activity. Results The Waist-Hip Ratio (WHR) and the Waist-to-Height Ratio (WtHR) showed significant differences (p≤0.001) between Mexico and Colombia (0.8 ± 0.1 versus 0.5 ± 0.1) and (0.4 ± 0.06 vs. 0.78 ± 0.04) respectively. The Automatic Linear Modeling showed that the main predictors for cholesterol levels were WtHR, MonoUnsaturated Fatty Acids (MUFA) and lipids ingestion. For glucose there were four main predictors: WHR, carbohydrates, MUFA and Saturated Fatty Acids (SFA). For triglycerides the pedictors were Products of Animal Origin (PAO), BMI, waist circumference, lipids and cholesterol ingestion and Mean Arterial Pressure (MAP). The Weight Estimation tests weighted per gender showed that for glucose levels the main determinants were carbohydrates, MUFA and oils; for cholesterol these were MUFA, PUFA and oils; and for LDL the significant variables were proteins, SFA, PAO and sugars; and last, for triglycerides the main variables were BMI, cholesterol and vegetables. Conclusions Mexico has higher values in almost all items of cardiovascular risk in children, but both countries have significant percentages of obesity and the population free of cardiovascular risk is minimal.
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Affiliation(s)
- Mónica López Palafox
- Autonomous University of the State of México (UAEMex), Faculty of Medicine, Toluca, Mexico
| | - Luis Celis
- Universidad de la Sabana, Cundinamarca, Colombia
| | | | | | | | - Carmen Cecilia Almonacid Urrego
- Universidad Colegio Mayor de Cundinamarca (UCMC), Bogotá, Colombia,ASociación CIentífica LAtina A.C. (ASCILA), Toluca, Mexico
| | | | - Hugo Mendieta Zerón
- Autonomous University of the State of México (UAEMex), Faculty of Medicine, Toluca, Mexico,ASociación CIentífica LAtina A.C. (ASCILA), Toluca, Mexico
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5
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Martínez-Martínez MD, Mendieta-Zerón H, Celis L, Layton-Tovar CF, Torres-García R, Gutiérrez-Pliego LE, Camarillo-Romero E, Garduño-García JD, Camarillo-Romero MD. Correlation of the Homeostasis Model Assessment Index and Adiponectin, Leptin and Insulin Levels to Body Mass Index-Associated Gene Polymorphisms in Adolescents. Sultan Qaboos Univ Med J 2019; 18:e291-e298. [PMID: 30607268 DOI: 10.18295/squmj.2018.18.03.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 03/13/2018] [Accepted: 04/05/2018] [Indexed: 12/31/2022] Open
Abstract
Objectives This study aimed to describe correlations between glucose, insulin and adipokine levels and the homeostasis model assessment (HOMA) index with regards to the presence/absence of fat mass and obesity-associated (FTO) rs9939609 and peroxisome proliferator-activated receptor (PPAR)-y rs1801282 single nucleotide polymorphisms (SNPs) as indicators of body mass index in adolescents. Methods This cross-sectional study was conducted between September and December 2016 in Toluca, Mexico. A total of 71 students between 14-18 years old were included. Various anthropometric and laboratory measurements were collected, including lipid profile, glucose, insulin and adipokine levels and HOMA index. The degree of association between variables was evaluated with regards to the presence/absence of the SNPs. Results Leptin levels were significantly higher among female students (P = 0.001), although adiponectin levels did not differ significantly (P = 0.060). There were significant positive correlations between insulin levels and HOMA index with FTO (r = 0.391; P = 0.007 and r = 0.413; P = 0.005, respectively) and PPARγ (r = 0.529; P = 0.007 and r = 0.537; P = 0.007, respectively) SNPs. Leptin showed a significant positive correlation in the presence of PPARγ (r = 0.483; P = 0.007) or in the absence of both SNPs (r = 0.627; P = 0.039). However, adiponectin was significantly negatively correlated in the presence of FTO, either alone (r = -0.333; P = 0.024) or in combination with PPARγ (r = -0.616; P = 0.043). Conclusion The presence of FTO and/or PPARγ SNPs might be related to a genetic predisposition to metabolic syndrome.
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Affiliation(s)
| | | | - Luis Celis
- Faculty of Medicine, Universidad de la Sabana, Chía, Colombia
| | | | - Rocío Torres-García
- Center for Research in Medical Sciences, Autonomous University of Mexico State, Toluca, Mexico
| | | | - Eneida Camarillo-Romero
- Center for Research in Medical Sciences, Autonomous University of Mexico State, Toluca, Mexico
| | - José D Garduño-García
- Center for Research in Medical Sciences, Autonomous University of Mexico State, Toluca, Mexico
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Vargas D, Celis L, Romero C, Lizcano F. Modulation of thyroid hormone receptor transactivation by the early region 1A (E1A)-like inhibitor of differentiation 1 (EID1). Genet Mol Biol 2008. [DOI: 10.1590/s1415-47572008000300003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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van den Beucken T, van Neer N, Sablon E, Desmet J, Celis L, Hoogenboom HR, Hufton SE. Building novel binding ligands to B7.1 and B7.2 based on human antibody single variable light chain domains. J Mol Biol 2001; 310:591-601. [PMID: 11439026 DOI: 10.1006/jmbi.2001.4703] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Ligands specific for B7.1 (CD80) and B7.2 (CD86) have applications in disease indications that require inhibition of T-cell activity. As we observed significant sequence and structural similarity between the B7-binding ligand, cytotoxic T-lymphocyte associated protein-4 (CTLA-4), and antibody variable light chain domains (VLs), we have explored the possibilities of making novel B7 binding molecules based on single VL domains. We first describe the "rational" design and construction of a VL/CTLA-4 hybrid molecule in which we have grafted both the CDR1 and CDR3-like loops of CTLA-4 onto a single VL light chain, at sites determined by sequence and structure-based alignment. This molecule was secreted as a soluble product from Escherichia coli, but did not show any binding to B7.1 and B7.2. In a second approach we constructed a VL library in which human VL genes derived from B-cells were spiked with the CDR3-like loop of CTLA-4 and further diversified by DNA shuffling. This library was displayed on phage, and after selection gave B7.1 binding ligands which competed with CTLA-4. In order to evaluate the possible general utility of VL domains as binding ligands, we have constructed a non-biased VL library. From this DNA-shuffled human VL library we have selected single VL domains specific for B7.1, B7.2 or human IgG. Two B7.1-specific VL ligands and one B7.2-specific VL ligand showed competition with CTLA-4. One candidate VL domain-specific for B7.1 was affinity matured by simultaneous randomisation of all CDR loops using DNA shuffling with degenerate CDR-spiking oligonucleotides. From this library, a single VL domain with affinity of 191 nM for B7.1 was obtained, which also showed binding to B7.1 in situ. This VL had mutations in CDR1 and CDR3, indicating that antigen recognition for this single VL is most likely mediated by the same regions as in the VL domain of whole antibodies. The B7.1 and B7.2-specific VL domains described in this study may form the basis of a new family of immunomodulatory recombinant molecules. Furthermore, our studies suggest that it is feasible to create specific single VL domains to diverse targets as is the case for single VH domains.
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Dincq S, Bosman F, Buyse MA, Degrieck R, Celis L, de Boer M, Van Doorsselaere V, Sablon E. Expression and purification of monospecific and bispecific recombinant antibody fragments derived from antibodies that block the CD80/CD86-CD28 costimulatory pathway. Protein Expr Purif 2001; 22:11-24. [PMID: 11388794 DOI: 10.1006/prep.2001.1417] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The development of recombinant techniques for rapid cloning, expression, and characterization of cDNAs encoding antibody (Ab) subunits has revolutionized the field of antibody engineering. By fusion to heterologous protein domains, chain shuffling, or inclusion of self-assembly motifs, novel molecules such as bispecific Abs can be generated that possess the subset of functional properties designed to fit the intended application. We describe the engineering of Ab fragments produced in bacteria for blocking the CD28-CD80/CD86 costimulatory interaction in order to induce tolerance against transplanted organs. We designed single-chain Fv antibodies, monospecific and bispecific diabodies, and a bispecific tetravalent antibody (BiTAb) molecule directed against the CD80 and/or CD86 costimulatory molecules. These recombinant Ab molecules were expressed in Escherichia coli, followed by purification and evaluation for specific interaction with their respective antigen in an enzyme-linked immunosorbent assay (ELISA). A specific sandwich ELISA confirmed the bispecificity of the bispecific diabodies and the BiTAb.
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MESH Headings
- Animals
- Antibodies, Bispecific/chemistry
- Antibodies, Bispecific/immunology
- Antibodies, Bispecific/isolation & purification
- Antibodies, Bispecific/pharmacology
- Antibodies, Monoclonal/chemistry
- Antibodies, Monoclonal/immunology
- Antibodies, Monoclonal/isolation & purification
- Antibodies, Monoclonal/pharmacology
- Antibody Specificity
- Antigens, CD/immunology
- Antigens, CD/metabolism
- B-Lymphocytes/drug effects
- B-Lymphocytes/immunology
- B-Lymphocytes/metabolism
- B7-1 Antigen/immunology
- B7-1 Antigen/metabolism
- B7-2 Antigen
- Binding Sites, Antibody
- Blotting, Western
- CD28 Antigens/immunology
- CD28 Antigens/metabolism
- Cell Line
- Enzyme-Linked Immunosorbent Assay
- Flow Cytometry
- Immune Tolerance/drug effects
- Immune Tolerance/immunology
- Immunoglobulin Fragments/chemistry
- Immunoglobulin Fragments/immunology
- Immunoglobulin Fragments/isolation & purification
- Immunoglobulin Fragments/pharmacology
- Immunoglobulin Variable Region/chemistry
- Immunoglobulin Variable Region/immunology
- Immunoglobulin Variable Region/isolation & purification
- Immunoglobulin Variable Region/pharmacology
- Membrane Glycoproteins/immunology
- Membrane Glycoproteins/metabolism
- Mice
- Models, Molecular
- Protein Engineering
- Recombinant Proteins/chemistry
- Recombinant Proteins/immunology
- Recombinant Proteins/isolation & purification
- Recombinant Proteins/pharmacology
- Signal Transduction/drug effects
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Affiliation(s)
- S Dincq
- Department of Microbiology, Innogenetics NV, Industriepark Zwijnaarde 7, Box 4, B-9052 Gent, Belgium.
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Celis L, Vandevyver C, Geusens P, Dequeker J, Raus J, Zhang J. Clonal expansion of mycobacterial heat-shock protein-reactive T lymphocytes in the synovial fluid and blood of rheumatoid arthritis patients. Arthritis Rheum 1997; 40:510-9. [PMID: 9082939 DOI: 10.1002/art.1780400317] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
OBJECTIVE To examine the reactivity pattern and T cell receptor (TCR) characteristics of mycobacterial heat-shock protein 65 (hsp65)-reactive T cells generated from paired synovial fluid (SF) and peripheral blood (PB) samples obtained from rheumatoid arthritis (RA) patients and from healthy subjects. METHODS The reactivity pattern of hsp65-reactive T cell clones generated under limiting-dilution conditions was analyzed in 3H-thymidine incorporation assays. The TCR variable regions of these hsp65-reactive T cells were characterized by polymerase chain reaction with TCR AV- and BV-specific primers and by DNA sequence analysis of the third complementarity-determining region (CDR3). RESULTS The hsp65-reactive T cells derived both from RA patients and controls preferentially recognized the 1-170 and 303-540 regions of hsp65 and did not cross-react with human hsp60. The hsp65-reactive T cell clones derived from RA patients displayed a restricted TCR AV and BV gene usage, which can be attributed to the limited clonal origin(s) of the independent T cell clones, as evidenced by CDR3 sequence analysis. These clonally expanded T cells were found in both PB and SF and in different inflamed joints of RA patients. CONCLUSION Our study suggests that there is in vivo clonal activation and expansion of mycobacterial hsp65-reactive T cells in patients with RA.
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Affiliation(s)
- L Celis
- Willems-Instituut, Diepenbeek, Belgium
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Hidalgo F, Viñas F, García JM, Urbina FO, Celis L, Abad M, Santos-Briz A. [Capillary testicular hemangioma: a case report]. Cir Pediatr 1995; 8:128-9. [PMID: 8527318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Testicular tumors in infants are rare and most of them are malignant. Hemangioma of the testis is an extremely rare tumor in infants. We report on an intratesticular capillary hemangioma that appeared in a 10 month-old child subsequently undergoing orchidectomy and on the patient's evolution at 4 years. The histological characteristics showed proliferation of small blood vessels, lined with endothelial cells. Mitoses and atypias were not found. Permitting differential diagnosis with other vascular tumors: Masson's vegetant intravascular hemangio-endothelioma and angiosarcoma.
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Affiliation(s)
- F Hidalgo
- Servicio de Cirugía Pediátrica y Anatomía Patológica, Hospital Virgen de la Vega, Salamanca
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De Vos P, Claessens F, Celis L, Peeters B, Rombauts W, Heyns W, Verhoeven G. Nuclear extracts enhance the interaction of fusion proteins containing the DNA-binding domain of the androgen and glucocorticoid receptor with androgen and glucocorticoid response elements. J Steroid Biochem Mol Biol 1994; 48:317-23. [PMID: 8142310 DOI: 10.1016/0960-0760(94)90071-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Comparable fragments of the androgen receptor (AR) (amino acids 540-607) and of the glucocorticoid receptor (GR) (amino acids 412-515) were expressed in E. coli as fusion proteins with protein A. Both fusion proteins, denoted ARF1 and GRF1, contain the DNA-binding domain and some flanking amino acids. In vitro binding assays have shown that both fusion proteins interact with androgen/glucocorticoid response elements (ARE/GREs) in an intron fragment of the C3(1) gene of the androgen-regulated rat prostatic binding protein and in the typically glucocorticoid-responsive long terminal repeat (LTR) promoter of mouse mammary tumour virus. Present results indicate that the interaction of both ARF1 and GRF1 with the C3(1) as well as the LTR fragments is enhanced in the presence of nuclear extract. The factor that gives rise to this enhancement appears to be ubiquitous and sensitive to trypsin and temperature treatment. In the C3(1) fragment, the enhancing effect requires the presence of an intact functional ARE/GRE (Core II) as well as a region spanning the ARE/GRE half-site Core I.
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MESH Headings
- Androgens/pharmacology
- Animals
- Base Sequence
- Binding Sites
- Cell Nucleus/physiology
- DNA/metabolism
- Glucocorticoids/pharmacology
- Introns
- Male
- Molecular Sequence Data
- Mutagenesis, Site-Directed
- Peptide Fragments/chemistry
- Peptide Fragments/genetics
- Peptide Fragments/metabolism
- Promoter Regions, Genetic
- Prostate/chemistry
- Rats
- Rats, Wistar
- Receptors, Androgen/chemistry
- Receptors, Androgen/genetics
- Receptors, Androgen/metabolism
- Receptors, Glucocorticoid/chemistry
- Receptors, Glucocorticoid/genetics
- Receptors, Glucocorticoid/metabolism
- Recombinant Fusion Proteins/metabolism
- Repetitive Sequences, Nucleic Acid
- Structure-Activity Relationship
- Temperature
- Trypsin/pharmacology
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Abstract
The expression of the three genes encoding the components C1, C2 and C3 of prostatic binding protein (PBP) is under androgen control and restricted to the rat ventral prostate. The SstI-PvuII fragment of the first intron of the C3(1) gene displays two binding sites for ubiquitous transcription factors and one for a tissue-specific factor in a 80-bp region upstream of its androgen response element (ARE). The octamer transcription factor 1 (OTF-1) binds to the most distal element (site 1) while a member of the nuclear factor I (NF-I) family recognizes site 2. A third unidentified prostate-specific factor, which also occurs in castrated rats, interacts with the proximal element (site 3). In T-47D cells, both the OTF-1 and the NF-I-like factor can modulate the androgen response of the promoter in a reporter gene construct containing the C3(1) intronic fragment.
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Affiliation(s)
- L Celis
- Afdeling Biochemie, Faculteit Geneskunde, Katholieke Universiteit Leuven, Belgium
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De Vos P, Claessens F, Celis L, Heyns W, Rombauts W, Verhoeven G. Nuclear extracts enhance gel retardation with androgen and glucocorticoid receptor DNA-binding domains. Ann N Y Acad Sci 1993; 684:202-4. [PMID: 8317831 DOI: 10.1111/j.1749-6632.1993.tb32284.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- P De Vos
- Laboratory for Experimental Medicine and Endocrinology, Catholic University of Leuven, Belgium
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Claessens F, Celis L, De Vos P, Heyns W, Verhoeven G, Peeters B, Rombauts W. Functional androgen response elements in the genes coding for prostatic binding protein. Ann N Y Acad Sci 1993; 684:199-201. [PMID: 8317830 DOI: 10.1111/j.1749-6632.1993.tb32283.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- F Claessens
- Department of Biochemistry, Catholic University of Leuven, Belgium
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15
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Claessens F, Celis L, De Vos P, Peeters B, Heyns W, Verhoeven G, Rombauts W. Intronic androgen response elements of prostatic binding protein genes. Biochem Biophys Res Commun 1993; 191:688-94. [PMID: 8461022 DOI: 10.1006/bbrc.1993.1272] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Transcription of the genes that code for the different components of Prostatic Binding Protein is dependent on androgens. DNA-cellulose competition assays have demonstrated the presence of regions with affinity for the androgen receptor located immediately upstream and in the first intron of these genes. DNase I footprinting in vitro now reveals the exact binding site of a receptor dimer in the first intron of the C3(1), C3(2) and C1 genes. Gene transfer experiments resulted in the description of functional androgen response elements in the C3 genes. The C1 intronic binding site, however, has a much weaker affinity for the DNA-binding domain of the androgen receptor, a characteristic that might explain its inability to function as an androgen response element in chimeric gene constructs.
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De Vos P, Claessens F, Winderickx J, Van Dijck P, Celis L, Peeters B, Rombauts W, Heyns W, Verhoeven G. Interaction of androgen response elements with the DNA-binding domain of the rat androgen receptor expressed in Escherichia coli. J Biol Chem 1991; 266:3439-43. [PMID: 1995608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
A fragment of the rat androgen receptor (amino acids 533-637) containing the DNA-binding domain was produced in Escherichia coli as a fusion product with protein A of Staphylococcus aureus. The fusion protein was purified on IgG-Sepharose, a method that does not involve the use of denaturing agents. Approximately 4 mg of fusion protein was obtained from 500 ml of bacterial culture. In gel shift assays, the recombinant DNA-binding domain displays an affinity for a fragment of the long terminal repeat of mouse mammary tumor virus and for an intronic fragment of the gene coding for the C3 component of the androgen-regulated rat prostatic binding protein. In a DNase I footprinting assay, the fusion protein protects a sequence in the C3 fragment that has previously been shown to act as a functional androgen response element. Interestingly, a single base pair mutation in the response element, which abolishes androgen inducibility, also destroys the ability to interact with the recombinant androgen receptor DNA-binding domain.
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Affiliation(s)
- P De Vos
- Laboratory of Experimental Medicine and Endocrinology, Faculty of Medicine, Catholic University of Leuven, Belgium
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Claessens F, Rushmere NK, Davies P, Celis L, Peeters B, Rombauts WA. Sequence-specific binding of androgen-receptor complexes to prostatic binding protein genes. Mol Cell Endocrinol 1990; 74:203-12. [PMID: 2095354 DOI: 10.1016/0303-7207(90)90225-w] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Prostatic binding protein is a complex glycoprotein comprising three components, C1, C2 and C3, organized into two different heterodimers (C1-C3 and C2-C3). The rat ventral prostate genes encoding all three constituent polypeptides are expressed under androgenic control. Analysis of genomic fragments containing the genes and flanking sequences revealed in each case one androgen receptor-binding region upstream of or within the promoter and another in the first intron. The effect of androgens on the expression of these genes may, therefore, be mediated by these direct receptor-DNA interactions. The genomic fragments which contain androgen receptor-binding regions all contain nucleotide sequences reminiscent of glucocorticoid response elements (GRE). Mutations in these sequences in restriction fragments and in synthetic oligonucleotides significantly decreased their affinity for androgen-receptor complexes and their introduction into nonspecific sequences conferred affinity for androgen-receptor complexes. Based on these data, a consensus sequence for putative androgen response elements (ARE) is proposed. However, despite the specific recognition of these sequences by the androgen receptor in vitro, only the C3(1) intronic fragment could confer significant androgen responsiveness on a heterologous promoter. While this could be due to the fact that the GRE-like sequences present in the other fragments are not strong AREs, alternative hypotheses are being investigated currently. Not least of these is that the similar localization of the binding sites in each gene might underlie a more complex androgen regulation mechanism.
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Affiliation(s)
- F Claessens
- Afdeling Biochemie, Faculteit Geneeskunde, Katholieke Universiteit Leuven, Belgium
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19
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Claessens F, Celis L, Peeters B, Heyns W, Verhoeven G, Rombauts W. Functional characterization of an androgen response element in the first intron of the C3(1) gene of prostatic binding protein. Biochem Biophys Res Commun 1989; 164:833-40. [PMID: 2818590 DOI: 10.1016/0006-291x(89)91534-9] [Citation(s) in RCA: 99] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We demonstrate that the 204 bp intronic gene fragment of C3(1), which has a specific in vitro affinity for the androgen receptor, is able to confer androgen responsiveness to a heterologous promoter. This characteristic is completely destroyed by a single G----T substitution, affecting a 5'-TGTTCT-3' element that closely resembles the consensus sequence of the glucocorticoid and progesterone response elements (GRE/PRE). In fact we could show that this androgen response element (ARE) also acts as a similarly weak GRE or PRE in T-47D cells.
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Affiliation(s)
- F Claessens
- Afdeling Biochemie, Faculteit Geneeskunde, Katholieke Universiteit Leuven, Belgium
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