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Rossotti MA, González-Techera A, Guarnaschelli J, Yim L, Camacho X, Fernández M, Cabral P, Leizagoyen C, Chabalgoity JA, González-Sapienza G. Increasing the potency of neutralizing single-domain antibodies by functionalization with a CD11b/CD18 binding domain. MAbs 2015; 7:820-8. [PMID: 26192995 PMCID: PMC4622952 DOI: 10.1080/19420862.2015.1068491] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Revised: 06/24/2015] [Accepted: 06/26/2015] [Indexed: 02/08/2023] Open
Abstract
Recombinant single domain antibodies (nanobodies) constitute an attractive alternative for the production of neutralizing therapeutic agents. Their small size warrants rapid bioavailability and fast penetration to sites of toxin uptake, but also rapid renal clearance, which negatively affects their performance. In this work, we present a new strategy to drastically improve the neutralizing potency of single domain antibodies based on their fusion to a second nanobody specific for the complement receptor CD11b/CD18 (Mac-1). These bispecific antibodies retain a small size (~30 kDa), but acquire effector functions that promote the elimination of the toxin-immunocomplexes. The principle was demonstrated in a mouse model of lethal toxicity with tetanus toxin. Three anti-tetanus toxin nanobodies were selected and characterized in terms of overlapping epitopes and inhibition of toxin binding to neuron gangliosides. Bispecific constructs of the most promising monodomain antibodies were built using anti Mac-1, CD45 and MHC II nanobodies. When co-administered with the toxin, all bispecific antibodies showed higher toxin-neutralizing capacity than the monomeric ones, but only their fusion to the anti-endocytic receptor Mac-1 nanobody allowed the mice to survive a 10-fold lethal dose. In a model of delayed neutralization of the toxin, the anti- Mac-1 bispecific antibodies outperformed a sheep anti-toxin polyclonal IgG that had shown similar neutralization potency in the co-administration experiments. This strategy should have widespread application in the development of nanobody-based neutralizing therapeutics, which can be produced economically and more safely than conventional antisera.
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Affiliation(s)
- Martin A Rossotti
- Cátedra de Inmunología; DEPBIO; Facultad de Química; Instituto de Higiene; Universidad de la República; Montevideo, Uruguay
| | - Andrés González-Techera
- Cátedra de Inmunología; DEPBIO; Facultad de Química; Instituto de Higiene; Universidad de la República; Montevideo, Uruguay
| | - Julio Guarnaschelli
- Departamento de Biotecnología; Facultad de Medicina; Instituto de Higiene; Universidad de la República; Montevideo, Uruguay
- Prondil S.A.; Montevideo, Uruguay
| | - Lucia Yim
- Departamento de Biotecnología; Facultad de Medicina; Instituto de Higiene; Universidad de la República; Montevideo, Uruguay
| | - Ximena Camacho
- Departamento de Radiofarmacia; Centro de Investigaciones Nucleares; Facultad de Ciencias; Universidad de la República; Montevideo, Uruguay
| | - Marcelo Fernández
- Departamento de Radiofarmacia; Centro de Investigaciones Nucleares; Facultad de Ciencias; Universidad de la República; Montevideo, Uruguay
| | - Pablo Cabral
- Departamento de Radiofarmacia; Centro de Investigaciones Nucleares; Facultad de Ciencias; Universidad de la República; Montevideo, Uruguay
| | | | - José A Chabalgoity
- Departamento de Biotecnología; Facultad de Medicina; Instituto de Higiene; Universidad de la República; Montevideo, Uruguay
| | - Gualberto González-Sapienza
- Cátedra de Inmunología; DEPBIO; Facultad de Química; Instituto de Higiene; Universidad de la República; Montevideo, Uruguay
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Goñi F, Mathiason CK, Yim L, Wong K, Hayes-Klug J, Nalls A, Peyser D, Estevez V, Denkers N, Xu J, Osborn DA, Miller KV, Warren RJ, Brown DR, Chabalgoity JA, Hoover EA, Wisniewski T. Mucosal immunization with an attenuated Salmonella vaccine partially protects white-tailed deer from chronic wasting disease. Vaccine 2014; 33:726-33. [PMID: 25539804 DOI: 10.1016/j.vaccine.2014.11.035] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [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: 08/20/2014] [Revised: 11/13/2014] [Accepted: 11/19/2014] [Indexed: 10/24/2022]
Abstract
Prion disease is a unique category of illness, affecting both animals and humans, in which the underlying pathogenesis is related to a conformational change of a normal, self-protein called PrP(C) (C for cellular) to a pathological and infectious conformer known as PrP(Sc) (Sc for scrapie). Bovine spongiform encephalopathy (BSE), a prion disease believed to have arisen from feeding cattle with prion contaminated meat and bone meal products, crossed the species barrier to infect humans. Chronic wasting disease (CWD) infects large numbers of deer and elk, with the potential to infect humans. Currently no prionosis has an effective treatment. Previously, we have demonstrated we could prevent transmission of prions in a proportion of susceptible mice with a mucosal vaccine. In the current study, white-tailed deer were orally inoculated with attenuated Salmonella expressing PrP, while control deer were orally inoculated with vehicle attenuated Salmonella. Once a mucosal response was established, the vaccinated animals were boosted orally and locally by application of polymerized recombinant PrP onto the tonsils and rectal mucosa. The vaccinated and control animals were then challenged orally with CWD-infected brain homogenate. Three years post CWD oral challenge all control deer developed clinical CWD (median survival 602 days), while among the vaccinated there was a significant prolongation of the incubation period (median survival 909 days; p=0.012 by Weibull regression analysis) and one deer has remained CWD free both clinically and by RAMALT and tonsil biopsies. This negative vaccinate has the highest titers of IgA in saliva and systemic IgG against PrP. Western blots showed that immunoglobulins from this vaccinate react to PrP(CWD). We document the first partially successful vaccination for a prion disease in a species naturally at risk.
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Affiliation(s)
- Fernando Goñi
- Department of Neurology, New York University School of Medicine, 550 First Avenue, New York, NY 10016, United States
| | - Candace K Mathiason
- College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, United States
| | - Lucia Yim
- Laboratory for Vaccine Research, Department of Biotechnology, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Kinlung Wong
- Department of Neurology, New York University School of Medicine, 550 First Avenue, New York, NY 10016, United States
| | - Jeanette Hayes-Klug
- College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, United States
| | - Amy Nalls
- College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, United States
| | - Daniel Peyser
- Department of Neurology, New York University School of Medicine, 550 First Avenue, New York, NY 10016, United States
| | - Veronica Estevez
- Laboratory for Vaccine Research, Department of Biotechnology, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Nathaniel Denkers
- College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, United States
| | - Jinfeng Xu
- Department of Population Health, New York University School of Medicine, 550 First Avenue, New York, NY 10016, United States
| | - David A Osborn
- Warnell School of Forestry and Natural Resources, University of Georgia, United States
| | - Karl V Miller
- Warnell School of Forestry and Natural Resources, University of Georgia, United States
| | - Robert J Warren
- Warnell School of Forestry and Natural Resources, University of Georgia, United States
| | - David R Brown
- Department of Biology and Biochemistry, University of Bath, UK
| | - Jose A Chabalgoity
- Laboratory for Vaccine Research, Department of Biotechnology, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Edward A Hoover
- College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, United States
| | - Thomas Wisniewski
- Department of Neurology, New York University School of Medicine, 550 First Avenue, New York, NY 10016, United States; Department of Pathology, New York University School of Medicine, 550 First Avenue, New York, NY 10016, United States; Department of Psychiatry, New York University School of Medicine, 550 First Avenue, New York, NY 10016, United States.
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Goni F, Mathiason C, Herline K, Hayes‐Klug J, Nalls A, Anderson K, Estevez V, Yim L, Brown D, Chabalgoity JA, Hoover E, Wisniewski T. P4‐205: MUCOSAL IMMUNIZATION TO PREVENT CHRONIC WASTING DISEASE (CWD) IN DEER. Alzheimers Dement 2014. [DOI: 10.1016/j.jalz.2014.05.1723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
| | | | | | | | - Amy Nalls
- Colorado State UniversityFort CollinsColoradoUnited States
| | - Kelly Anderson
- Colorado State UniversityFort CollinsColoradoUnited States
| | | | - Lucia Yim
- University of UruguayMontevideoUruguay
| | | | | | - Edward Hoover
- Colorado State UniversityFort CollinsColoradoUnited States
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Wisniewski T, Mathiason C, Wong K, Hayes‐Klug J, Nalls A, Anderson K, Estevez V, Yim L, Brown D, Chabalgoity JA, Hoover E, Goni F. P2‐399: Active immune intervention for prionoses in deer. Alzheimers Dement 2012. [DOI: 10.1016/j.jalz.2012.05.1109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
| | | | - Kinlung Wong
- NYU School of MedicineNew YorkNew YorkUnited States
| | | | - Amy Nalls
- Colorado State UniversityFort CollinsColoradoUnited States
| | - Kelly Anderson
- Colorado State UniversityFort CollinsColoradoUnited States
| | | | - Lucia Yim
- University of UruguayMontevideoUruguay
| | | | | | - Edward Hoover
- Colorado State UniversityFort CollinsColoradoUnited States
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Wisniewski T, Mathiason C, Wong V, Hayes‐Klug J, Nalls A, Anderson K, Estevez V, Yim L, Brown D, Chabalgoity JA, Hoover E, Goni F. O4‐03‐06: Specific anti‐PrP mucosal and systemic response in white tail deer vaccinated with attenuated salmonella expressing deer PrP. Alzheimers Dement 2011. [DOI: 10.1016/j.jalz.2011.05.1985] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - Valentino Wong
- New York University School of MedicineNew YorkN.Y.United States
| | | | - Amy Nalls
- Colorado State UniversityFort CollinsColoradoUnited States
| | - Kelly Anderson
- Colorado State UniversityFort CollinsColoradoUnited States
| | | | - Lucia Yim
- University of UruguayMontevideoUruguay
| | | | | | - Edward Hoover
- Colorado State UniversityFort CollinsColoradoUnited States
| | - Fernando Goni
- New York University School of MedicineNew YorkN.Y.United States
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Betancor L, Yim L, Fookes M, Martinez A, Thomson NR, Ivens A, Peters S, Bryant C, Algorta G, Kariuki S, Schelotto F, Maskell D, Dougan G, Chabalgoity JA. Genomic and phenotypic variation in epidemic-spanning Salmonella enterica serovar Enteritidis isolates. BMC Microbiol 2009; 9:237. [PMID: 19922635 PMCID: PMC2784474 DOI: 10.1186/1471-2180-9-237] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2009] [Accepted: 11/18/2009] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Salmonella enterica serovar Enteritidis (S. Enteritidis) has caused major epidemics of gastrointestinal infection in many different countries. In this study we investigate genome divergence and pathogenic potential in S. Enteritidis isolated before, during and after an epidemic in Uruguay. RESULTS 266 S. Enteritidis isolates were genotyped using RAPD-PCR and a selection were subjected to PFGE analysis. From these, 29 isolates spanning different periods, genetic profiles and sources of isolation were assayed for their ability to infect human epithelial cells and subjected to comparative genomic hybridization using a Salmonella pan-array and the sequenced strain S. Enteritidis PT4 P125109 as reference. Six other isolates from distant countries were included as external comparators.Two hundred and thirty three chromosomal genes as well as the virulence plasmid were found as variable among S. Enteritidis isolates. Ten out of the 16 chromosomal regions that varied between different isolates correspond to phage-like regions. The 2 oldest pre-epidemic isolates lack phage SE20 and harbour other phage encoded genes that are absent in the sequenced strain. Besides variation in prophage, we found variation in genes involved in metabolism and bacterial fitness. Five epidemic strains lack the complete Salmonella virulence plasmid. Significantly, strains with indistinguishable genetic patterns still showed major differences in their ability to infect epithelial cells, indicating that the approach used was insufficient to detect the genetic basis of this differential behaviour. CONCLUSION The recent epidemic of S. Enteritidis infection in Uruguay has been driven by the introduction of closely related strains of phage type 4 lineage. Our results confirm previous reports demonstrating a high degree of genetic homogeneity among S. Enteritidis isolates. However, 10 of the regions of variability described here are for the first time reported as being variable in S. Enteritidis. In particular, the oldest pre-epidemic isolates carry phage-associated genetic regions not previously reported in S. Enteritidis. Overall, our results support the view that phages play a crucial role in the generation of genetic diversity in S. Enteritidis and that phage SE20 may be a key marker for the emergence of particular isolates capable of causing epidemics.
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Affiliation(s)
- Laura Betancor
- Departamento de Desarrollo Biotecnológico, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Av. A, Navarro 3051, CP 11600, Montevideo, Uruguay
- Departamento de Bacteriología y Virología, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Av. A, Navarro 3051, CP 11600, Montevideo, Uruguay
| | - Lucia Yim
- Departamento de Desarrollo Biotecnológico, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Av. A, Navarro 3051, CP 11600, Montevideo, Uruguay
| | - Maria Fookes
- The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - Araci Martinez
- Departamento de Desarrollo Biotecnológico, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Av. A, Navarro 3051, CP 11600, Montevideo, Uruguay
- Departamento de Bacteriología y Virología, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Av. A, Navarro 3051, CP 11600, Montevideo, Uruguay
| | - Nicholas R Thomson
- The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - Alasdair Ivens
- The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - Sarah Peters
- Department of Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge CB3 0ES, UK
| | - Clare Bryant
- Department of Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge CB3 0ES, UK
| | - Gabriela Algorta
- Departamento de Bacteriología y Virología, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Av. A, Navarro 3051, CP 11600, Montevideo, Uruguay
| | - Samuel Kariuki
- Centre for Microbiology Research, Kenya Medical Reserch Institute, Nairobi, Kenya
| | - Felipe Schelotto
- Departamento de Bacteriología y Virología, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Av. A, Navarro 3051, CP 11600, Montevideo, Uruguay
| | - Duncan Maskell
- Department of Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge CB3 0ES, UK
| | - Gordon Dougan
- The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - Jose A Chabalgoity
- Departamento de Desarrollo Biotecnológico, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Av. A, Navarro 3051, CP 11600, Montevideo, Uruguay
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Monleón D, Martínez-Vicente M, Esteve V, Yim L, Prado S, Armengod ME, Celda B. Structural insights into the GTPase domain of Escherichia coli MnmE protein. Proteins 2007; 66:726-39. [PMID: 17143896 DOI: 10.1002/prot.21186] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The Escherichia coli MnmE protein is a 50-kDa multidomain GTPase involved in tRNA modification. Its homologues in eukaryotes are crucial for mitochondrial respiration and, thus, it is thought that the human protein might be involved in mitochondrial diseases. Unlike Ras, MnmE shows a high intrinsic GTPase activity and requires effective GTP hydrolysis, and not simply GTP binding, to be functionally active. The isolated MnmE G-domain (165 residues) conserves the GTPase activity of the entire protein, suggesting that it contains the catalytic residues for GTP hydrolysis. To explore the GTP hydrolysis mechanism of MnmE, we analyzed the effect of low pH on binding and hydrolysis of GTP, as well as on the formation of a MnmE transition state mimic. GTP hydrolysis by MnmE, but not GTP binding or formation of a complex with mant-GDP and aluminium fluoride, is impaired at acidic pH, suggesting that the chemistry of the transition state mimic is different to that of the true transition state, and that some residue(s), critical for GTP hydrolysis, is severely affected by low pH. We use a nuclear magnetic resonance (NMR)-based approach to get insights into the MnmE structure and properties. The combined use of NMR restraints and homology structural information allowed the determination of the MnmE G-domain structure in its free form. Chemical shift structure-based prediction provided a good basis for structure refinement and validation. Our data support that MnmE, unlike other GTPases, does not use an arginine finger to drive catalysis, although Arg252 may play a role in stabilization of the transition state.
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Affiliation(s)
- Daniel Monleón
- Department of Physical Chemistry, University of Valencia, C/Dr. Moliner, 50, Burjassot 46100 Valencia, Spain
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Affiliation(s)
| | | | - Lucia Yim
- Instituto de Biologia Molecular do Paraná, Brazil
| | - Arnaldo Zaha
- Universidade Federal do Rio Grande do Sul, Brazil
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Abstract
A preliminary cross-sectional study of 72 Hong Kong Chinese infants suggested that these infants learn to roll from supine-to-prone before rolling from prone-to-supine i.e. the opposite to teaching in most western texts. Three-hundred and sixty mothers were recruited postpartum and asked to record, on a chart, information related to the developmental milestone of rolling over for their infants (49% male) during the next 9 months. Telephone reminders were given at 4 and 8 months and, by the end of the study, information had been obtained from 240 mothers (67% of original sample, 51% male infants). Mean ages of rolling over were 5.1 months (SD1.5) for supine-to-prone and 5.7 months (SD1.3) for prone-to-supine. Age of rolling over from supine-to-prone was not influenced by usual sleep position, infant's sex, mother's intention to breastfeed infant, number of siblings, marital status, main daytime caregiver, or feeding method over 9 months. Hong Kong Chinese infants roll from supine-to-prone before they roll from prone-to-supine.
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Affiliation(s)
- E A S Nelson
- Department of Paediatrics, The Chinese University of Hong Kong, 6/F Clinical Science Building, Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China.
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Yim L, Vandenbussche G, Mingorance J, Rueda S, Casanova M, Ruysschaert JM, Vicente M. Role of the carboxy terminus of Escherichia coli FtsA in self-interaction and cell division. J Bacteriol 2000; 182:6366-73. [PMID: 11053380 PMCID: PMC94782 DOI: 10.1128/jb.182.22.6366-6373.2000] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The role of the carboxy terminus of the Escherichia coli cell division protein FtsA in bacterial division has been studied by making a series of short sequential deletions spanning from residue 394 to 420. Deletions as short as 5 residues destroy the biological function of the protein. Residue W415 is essential for the localization of the protein into septal rings. Overexpression of the ftsA alleles harboring these deletions caused a coiled cell phenotype previously described for another carboxy-terminal mutation (Gayda et al., J. Bacteriol. 174:5362-5370, 1992), suggesting that an interaction of FtsA with itself might play a role in its function. The existence of such an interaction was demonstrated using the yeast two-hybrid system and a protein overlay assay. Even these short deletions are sufficient for impairing the interaction of the truncated FtsA forms with the wild-type protein in the yeast two-hybrid system. The existence of additional interactions between FtsA molecules, involving other domains, can be postulated from the interaction properties shown by the FtsA deletion mutant forms, because although unable to interact with the wild-type and with FtsADelta1, they can interact with themselves and cross-interact with each other. The secondary structures of an extensive deletion, FtsADelta27, and the wild-type protein are indistinguishable when analyzed by Fourier transform infrared spectroscopy, and moreover, FtsADelta27 retains the ability to bind ATP. These results indicate that deletion of the carboxy-terminal 27 residues does not alter substantially the structure of the protein and suggest that the loss of biological function of the carboxy-terminal deletion mutants might be related to the modification of their interacting properties.
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Affiliation(s)
- L Yim
- Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas, Campus de Cantoblanco, 28049 Madrid, Spain
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Chorpita BF, Yim L, Moffitt C, Umemoto LA, Francis SE. Assessment of symptoms of DSM-IV anxiety and depression in children: a revised child anxiety and depression scale. Behav Res Ther 2000; 38:835-55. [PMID: 10937431 DOI: 10.1016/s0005-7967(99)00130-8] [Citation(s) in RCA: 1079] [Impact Index Per Article: 45.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The practical significance of assessing disorders of emotion in children is well documented, yet few scales exist that possess conceptual if not empirical relevance to dimensions of DSM anxiety or depressive disorders. The current study evaluated an adaptation of a recently developed anxiety measure (Spence Children's Anxiety Scale; [Spence, S. H. (1997). Structure of anxiety symptoms among children: a confirmatory factor-analytic study. Journal of Abnormal Psychology, 106, 280-297; Spence, S. H. (1998). A measure of anxiety symptoms among children. Behaviour Research and Therapy, 36, 545-566]), revised to correspond to dimensions of several DSM-IV anxiety disorders as well as major depression. This investigation involved initial evaluation of the factorial validity of the revised measure in a school sample of 1641 children and adolescents and reliability and validity in an independent sample of 246 children and adolescents. Results yielded an item set and factor definitions that demonstrated structure consistent with DSM-IV anxiety disorders and depression. The revised factor structure and definitions were further supported by the reliability and validity analyses. Some implications for assessment of childhood anxiety and depressive disorders are discussed.
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Affiliation(s)
- B F Chorpita
- Department of Psychology, University of Hawaii at Manoa, Honolulu 96822, USA.
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