1
|
Caicedo-Borrero DM, Tovar JR, Méndez A, Parra B, Bonelo A, Celis J, Villegas L, Collazos C, Osorio L. Development and Performance of Dengue Diagnostic Clinical Algorithms in Colombia. Am J Trop Med Hyg 2020; 102:1226-1236. [PMID: 32342839 DOI: 10.4269/ajtmh.19-0722] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Diagnosing dengue in endemic areas remains problematic because of the low specificity of the symptoms and lack of accurate diagnostic tests. This study aimed to develop and prospectively validate, under routine care, dengue diagnostic clinical algorithms. The study was carried out in two phases. First, diagnostic algorithms were developed using a database of 1,130 dengue and 918 non-dengue patients, expert opinion, and literature review. Algorithms with > 70% sensitivity were prospectively validated in a single-group quasi-experimental trial with an adaptive Bayesian design. In the first phase, the algorithms that were developed with the continuous Bayes formula and included leukocytes and platelet counts, in addition to selected signs and symptoms, showed the highest sensitivities (> 80%). In the second phase, the algorithms were applied on admission to 1,039 consecutive febrile subjects in three endemic areas in Colombia of whom 25 were laboratory-confirmed dengue, 307 non-dengue, 514 probable dengue, and 193 undetermined. Including parameters of the hemogram consistently improved specificity without affecting sensitivity. In the final analysis, considering only confirmed dengue and non-dengue cases, an algorithm with a sensitivity and specificity of 65.4% (95% credibility interval 50-83) and 40.1% (34.7-45.7) was identified. All tested algorithms had likelihood ratios close to 1, and hence, they are not useful to confirm or rule out dengue in endemic areas. The findings support the use of hemograms to aid dengue diagnosis and highlight the challenges of clinical diagnosis of dengue.
Collapse
Affiliation(s)
- Diana María Caicedo-Borrero
- Grupo de Investigación en Economía, Gestión y Salud, Department of Public Health and Epidemiology, Pontificia Universidad Javeriana Seccional Cali, Cali, Colombia.,Grupo Epidemiología y Salud Poblacional GESP, School of Public Health, Universidad del Valle, Cali, Colombia
| | | | - Andrés Méndez
- School of Statistics, Universidad del Valle, Cali, Colombia
| | - Beatriz Parra
- Department of Microbiology, Grupo de Investigación en Virus Emergentes VIREM, School of Basic Sciences, Universidad del Valle, Cali, Colombia
| | - Anilza Bonelo
- Department of Microbiology, Grupo de Investigación en Virus Emergentes VIREM, School of Basic Sciences, Universidad del Valle, Cali, Colombia
| | - Jairo Celis
- Grupo de Investigación en Evaluación de Servicios de Salud, COMFANDI, Cali, Colombia
| | - Liliana Villegas
- Grupo de Investigación en Evaluación de Servicios de Salud, COMFANDI, Cali, Colombia
| | - Constanza Collazos
- Grupo de Investigación en Evaluación de Servicios de Salud, COMFANDI, Cali, Colombia
| | - Lyda Osorio
- Grupo Epidemiología y Salud Poblacional GESP, School of Public Health, Universidad del Valle, Cali, Colombia
| |
Collapse
|
2
|
Guzmán-Rodríguez M, Acosta-Ñañez HF, Mantilla JC, Bonelo A. Dengue Virus and Influenza A Virus Co-Infection in Pregnancy: A Case Report. Trop Med Infect Dis 2019; 4:tropicalmed4020084. [PMID: 31117316 PMCID: PMC6631397 DOI: 10.3390/tropicalmed4020084] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 04/25/2019] [Accepted: 04/26/2019] [Indexed: 01/11/2023] Open
Abstract
Dengue is still an important cause of disease and mortality in tropical countries, as is influenza A virus, which is also a cause of epidemics all over the globe. In this article, we present the case of a 31-year-old woman who was in her second trimester of pregnancy and presented with severe dengue with hematological and neurological complications, and premature labor. She was misdiagnosed with bacterial infection and received antibiotic treatment with no improvement of the clinical manifestations and previous to death, she was diagnosed with dengue infection. She died from cardiorespiratory arrest. In the postmortem evaluation, influenza A co-infection was confirmed and characterization of the tissue damage and immune response in lung, liver, kidney, heart, spleen, and brain was determined, finding a severe inflammatory response in lung with T cells and macrophages infiltrating the tissue. This case report highlights the risks of accepting a single diagnosis, especially in endemic countries to multiple tropical diseases, which can lead to delay in appropriate treatment that could reduce morbidity and mortality.
Collapse
Affiliation(s)
- Mónica Guzmán-Rodríguez
- Magister in Biomedical Sciences, Universidad del Valle, Cali 760001, Colombia.
- Emergent Viruses and Disease-VIREM, Universidad del Valle, Cali 760001, Colombia.
| | | | - Julio César Mantilla
- Department of Pathology, Universidad Industrial de Santander, Bucaramanga 680001, Colombia.
| | - Anilza Bonelo
- Emergent Viruses and Disease-VIREM, Universidad del Valle, Cali 760001, Colombia.
| |
Collapse
|
3
|
Zea-Vera AF, Estupiñan-Lopez FE, Cifuentes-Burbano J, Vargas MJ, Bonelo A. Interleukin-36 Receptor Antagonist Deficiency (DITRA) with a Novel IL36RN Homozygous Mutation c.200G > T (P.Cys67Phe) in a Young Colombian Woman. J Clin Immunol 2019; 39:261-263. [PMID: 30953287 DOI: 10.1007/s10875-019-00622-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Accepted: 03/31/2019] [Indexed: 11/27/2022]
Affiliation(s)
- Andres F Zea-Vera
- Microbiology Department, Faculty of Health, Universidad del Valle, Calle 4b #36-00 Building 120, Office 304, Cali, Colombia.
- Clinical Immunology Clinic, Hospital Universitario del Valle, Cali, Colombia.
| | | | | | - Myriam J Vargas
- Dermatology Service, Faculty of Health, Universidad del Valle, Cali, Colombia
- Psoriasis and Phototherapy Clinic, Hospital Universitario del Valle, Cali, Colombia
| | - Anilza Bonelo
- Microbiology Department, Faculty of Health, Universidad del Valle, Calle 4b #36-00 Building 120, Office 304, Cali, Colombia
| |
Collapse
|
4
|
Rojas EM, Herrera VM, Miranda MC, Rojas DP, Gómez AM, Pallares C, Cobos SM, Pardo L, Gélvez M, Páez A, Mantilla JC, Bonelo A, Parra E, Villar LA. Clinical Indicators of Fatal Dengue in Two Endemic Areas of Colombia: A Hospital-Based Case-Control Study. Am J Trop Med Hyg 2019; 100:411-419. [PMID: 30652671 PMCID: PMC6367622 DOI: 10.4269/ajtmh.17-0323] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Accepted: 08/14/2018] [Indexed: 12/19/2022] Open
Abstract
According to the World Health Organization, 98% of fatal dengue cases can be prevented; however, endemic countries such as Colombia have recorded higher case fatality rates during recent epidemics. We aimed to identify the predictors of mortality that allow risk stratification and timely intervention in patients with dengue. We conducted a hospital-based, case-control (1:2) study in two endemic areas of Colombia (2009-2015). Fatal cases were defined as having either 1) positive serological test (IgM or NS1), 2) positive virological test (RT-PCR or viral isolation), or 3) autopsy findings compatible with death from dengue. Controls (matched by state and year) were hospitalized nonfatal patients and had a positive serological or virological dengue test. Exposure data were extracted from medical records by trained staff. We used conditional logistic regression (adjusting for age, gender, disease's duration, and health-care provider) in the context of multiple imputation to estimate exposure to case-control associations. We evaluated 110 cases and 217 controls (mean age: 35.0 versus 18.9; disease's duration pre-admission: 4.9 versus 5.0 days). In multivariable analysis, retro-ocular pain (odds ratios [OR] = 0.23), nausea (OR = 0.29), and diarrhea (OR = 0.19) were less prevalent among fatal than nonfatal cases, whereas increased age (OR = 2.46 per 10 years), respiratory distress (OR = 16.3), impaired consciousness (OR = 15.9), jaundice (OR = 32.2), and increased heart rate (OR = 2.01 per 10 beats per minute) increased the likelihood of death (AUC: 0.97, 95% confidence interval: 0.96, 0.99). These results provide evidence that features of severe dengue are associated with higher mortality, which strengthens the recommendations related to triaging patients in dengue-endemic areas.
Collapse
Affiliation(s)
- Elsa M. Rojas
- Center for Epidemiological Research, Universidad Industrial de Santander-UIS, Bucaramanga, Colombia
- Info Vida, Bucaramanga, Colombia
| | - Víctor M. Herrera
- Center for Epidemiological Research, Universidad Industrial de Santander-UIS, Bucaramanga, Colombia
| | - María C. Miranda
- Center for Epidemiological Research, Universidad Industrial de Santander-UIS, Bucaramanga, Colombia
| | - Diana Patricia Rojas
- Department of Epidemiology, College of Public Health and Health Professions and College of Medicine, University of Florida, Gainesville, Florida
| | - Adriana M. Gómez
- Center for Epidemiological Research, Universidad Industrial de Santander-UIS, Bucaramanga, Colombia
| | | | | | | | - Margarita Gélvez
- Center for Epidemiological Research, Universidad Industrial de Santander-UIS, Bucaramanga, Colombia
| | - Andrés Páez
- Instituto Nacional de Salud, Bogotá, Colombia
| | - Julio C. Mantilla
- Department of Pathology, Universidad Industrial de Santander-UIS, Bucaramanga, Colombia
| | - Anilza Bonelo
- Emerging Viruses and Disease-VIREM, Universidad del Valle, Cali, Colombia
| | - Edgar Parra
- Instituto Nacional de Salud, Bogotá, Colombia
| | - Luis A. Villar
- Center for Epidemiological Research, Universidad Industrial de Santander-UIS, Bucaramanga, Colombia
| |
Collapse
|
5
|
Caro F, Carvajal H, Bonelo A, Vélez I. Tremátodos de murciélagos de la ciudad de Cali y áreas vecinas (Colombia). Actual Biol 2017. [DOI: 10.17533/udea.acbi.329508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Dos especies de murciélagos, Molossus molossus Pallas (1766) y Pteroteryx kappleri Peters (1867), presentes en el área urbana de la ciudad de Cali, departamento del Valle (Colombia), fueron examinadas para detectar la presencia de tremátodos digéneos. Ambas especies de murciélagos resultaron estar parasitadas con tremátodos de las familias Lecithodendriidae, Nudacotylidae, Urotrematidae y Anenterotrematidae. En total se encontraron siete géneros y ocho especies. Los tremátodos encontrados fueron preparados, medidos y descritos.
Collapse
|
6
|
Osorio L, Uribe M, Ardila GI, Orejuela Y, Velasco M, Bonelo A, Parra B. The use of rapid dengue diagnostic tests in a routine clinical setting in a dengue-endemic area of Colombia. Mem Inst Oswaldo Cruz 2015; 110:510-6. [PMID: 25993399 PMCID: PMC4501415 DOI: 10.1590/0074-02760140359] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Accepted: 04/01/2015] [Indexed: 12/03/2022] Open
Abstract
There is insufficient evidence of the usefulness of dengue diagnostic tests under
routine conditions. We sought to analyse how physicians are using dengue diagnostics
to inform research and development. Subjects attending 14 health institutions in an
endemic area of Colombia with either a clinical diagnosis of dengue or for whom a
dengue test was ordered were included in the study. Patterns of test-use are
described herein. Factors associated with the ordering of dengue diagnostic tests
were identified using contingency tables, nonparametric tests and logistic
regression. A total of 778 subjects were diagnosed with dengue by the treating
physician, of whom 386 (49.5%) were tested for dengue. Another 491 dengue tests were
ordered in subjects whose primary diagnosis was not dengue. Severe dengue
classification [odds ratio (OR) 2.2; 95% confidence interval (CI) 1.1-4.5], emergency
consultation (OR 1.9; 95% CI 1.4-2.5) and month of the year (OR 3.1; 95% CI 1.7-5.5)
were independently associated with ordering of dengue tests. Dengue tests were used
both to rule in and rule out diagnosis. The latter use is not justified by the
sensitivity of current rapid dengue diagnostic tests. Ordering of dengue tests appear
to depend on a combination of factors, including physician and institutional
preferences, as well as other patient and epidemiological factors.
Collapse
Affiliation(s)
- Lyda Osorio
- Escuela de Salud Pública, Universidad del Valle, Cali, Colombia
| | - Marcela Uribe
- Escuela de Salud Pública, Universidad del Valle, Cali, Colombia
| | - Gloria Ines Ardila
- Laboratorio Especializado, Caja de Compensación Familiar del Valle del Cauca, Cali, Colombia
| | - Yaneth Orejuela
- Laboratorio Especializado, Caja de Compensación Familiar del Valle del Cauca, Cali, Colombia
| | - Margarita Velasco
- Laboratorio Especializado, Caja de Compensación Familiar del Valle del Cauca, Cali, Colombia
| | - Anilza Bonelo
- Caja de Compensación Familiar del Valle del Cauca, Cali, Colombia
| | - Beatriz Parra
- Departamento de Microbiología, Universidad del Valle, Cali, Colombia
| |
Collapse
|
7
|
Núñez C, Páez A, Hernández C, Escobar H, Bonelo A. Transmisión del virus de la rabia entre murciélagos urbanos del departamento del Valle del Cauca, Colombia, 1999-2008. Infectio 2012. [DOI: 10.1016/s0123-9392(12)70054-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
|
8
|
Arévalo-Herrera M, Soto L, Perlaza BL, Céspedes N, Vera O, Lenis AM, Bonelo A, Corradin G, Herrera S. Antibody-mediated and cellular immune responses induced in naive volunteers by vaccination with long synthetic peptides derived from the Plasmodium vivax circumsporozoite protein. Am J Trop Med Hyg 2011; 84:35-42. [PMID: 21292876 DOI: 10.4269/ajtmh.2011.09-0507] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Plasmodium vivax circumsporozoite (CS) protein is a leading malaria vaccine candidate. We describe the characterization of specific immune responses induced in 21 malaria-naive volunteers vaccinated with long synthetic peptides derived from the CS protein formulated in Montanide ISA 720. Both antibody- and cell-mediated immune responses were analyzed. Antibodies were predominantly of IgG1 and IgG3 isotypes, recognized parasite proteins on the immunofluorescent antibody test, and partially blocked sporozoite invasion of hepatoma cell lines in vitro. Peripheral blood mononuclear cells from most volunteers (94%) showed IFN-γ production in vitro upon stimulation with both long signal peptide and short peptides containing CD8+ T-cell epitopes. The relatively limited sample size did not allow conclusions about HLA associations with the immune responses observed. In summary, the inherent safety and tolerability together with strong antibody responses, invasion blocking activity, and the IFN-γ production induced by these vaccine candidates warrants further testing in a phase II clinical trial.
Collapse
|
9
|
Cardona N, Basto N, Parra B, Zea AF, Pardo CA, Bonelo A, Gómez-Marin JE. Detection ofToxoplasmaDNA in the Peripheral Blood of HIV-Positive Patients with Neuro-opportunistic Infections by a Real-Time PCR Assay. ACTA ACUST UNITED AC 2011. [DOI: 10.4303/jnp/n110402] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Nestor Cardona
- GEPAMOL (Group of Molecular Parasitology), Biomedical Research Centre, Faculty of Health Sciences, University of Quindio, AA 460 Armenia, Quindio, Colombia
| | - Natalia Basto
- Virology Research Group, School of Basic Sciences, Faculty of Health, University of Valle, Cali, Colombia
| | - Beatriz Parra
- Virology Research Group, School of Basic Sciences, Faculty of Health, University of Valle, Cali, Colombia
| | - Andres Felipe Zea
- Virology Research Group, School of Basic Sciences, Faculty of Health, University of Valle, Cali, Colombia
| | - Carlos A. Pardo
- Department of Neurology, School of Medicine, Johns Hopkins University, Baltimore, MD 21287, USA
| | - Anilza Bonelo
- Virology Research Group, School of Basic Sciences, Faculty of Health, University of Valle, Cali, Colombia
| | - Jorge Enrique Gómez-Marin
- GEPAMOL (Group of Molecular Parasitology), Biomedical Research Centre, Faculty of Health Sciences, University of Quindio, AA 460 Armenia, Quindio, Colombia
| |
Collapse
|
10
|
Osorio L, Ramirez M, Bonelo A, Villar LA, Parra B. Comparison of the diagnostic accuracy of commercial NS1-based diagnostic tests for early dengue infection. Virol J 2010; 7:361. [PMID: 21134275 PMCID: PMC3016282 DOI: 10.1186/1743-422x-7-361] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Accepted: 12/06/2010] [Indexed: 11/12/2022] Open
Abstract
Background We compared the diagnostic accuracy and reproducibility of commercially available NS1-based dengue tests and explored factors influencing their sensitivities. Methods Paired analysis of 310 samples previously characterized as positive (n = 218) and negative (n = 92) for viral isolation and/or RT-PCR and/or IgM seroconversion. Masked samples were tested by two observers with Platelia™ Dengue NS1 Ag, second generation Pan-E™ Dengue Early ELISA, SD Dengue NS1 Ag ELISA, Dengue NS1 Ag STRIP™, and SD BIOLINE™ Dengue Duo (NS1/IgM/IgG). Results SD BIOLINE™ NS1/IgM/IgG had the highest sensitivity (80.7% 95%CI 75-85.7) with likelihood ratios of 7.4 (95%CI 4.1-13.8) and 0.21 (95%CI 0.16-0.28). The ELISA-format tests showed comparable sensitivities; all below 75%. STRIP™ and SD NS1 had even lower sensitivities (<65%). The sensitivities significantly decreased in samples taken after 3 days of fever onset, in secondary infections, viral serotypes 2 and 4, and severe dengue. Adding IgM or IgG to SD NS1 increased its sensitivity in all these situations. Conclusions The simultaneous detection of NS1/IgM/IgG would be potentially useful for dengue diagnosis in both endemic and non endemic areas. A negative result does not rule out dengue. Further studies are required to assess the performance and impact of early laboratory diagnosis of dengue in the routine clinical setting.
Collapse
Affiliation(s)
- Lyda Osorio
- Grupo de Epidemiologia y Salud Poblacional (GESP) Escuela de Salud Publica, Facultad de Salud, Universidad del Valle, Cali, Colombia Calle 4b 36-140, Cali-Colombia.
| | | | | | | | | |
Collapse
|
11
|
Herrera S, Bonelo A, Perlaza BL, Fernández OL, Victoria L, Lenis AM, Soto L, Hurtado H, Acuña LM, Vélez JD, Palacios R, Chen-Mok M, Corradin G, Arévalo-Herrera M. Safety and elicitation of humoral and cellular responses in colombian malaria-naive volunteers by a Plasmodium vivax circumsporozoite protein-derived synthetic vaccine. Am J Trop Med Hyg 2006; 73:3-9. [PMID: 16291760 DOI: 10.4269/ajtmh.2005.73.3] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [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: 11/07/2022] Open
Abstract
Substantial experimental evidence indicates that the Plasmodium circumsporozoite (CS) protein has great potential as a vaccine candidate. We tested the safety and immunogenicity of vaccines composed of P. vivax CS-derived synthetic peptides. Sixty-nine healthy, malaria-naive volunteers were randomized to receive three injections of placebo or synthetic proteins N, R, or C (10, 30, or 100 microg/dose) in a double-blinded fashion. Vaccines were well tolerated and no serious adverse events were observed. Peptides N and R elicited humoral responses at all doses; peptide C elicicted these responses only at doses of 30 and 100 microg. The N peptide at a dose of 100 microg elicited the greatest antibody response. Antibodies to the three peptides recognized P. vivax sporozoites in an immunofluorescent antibody test. Peripheral blood mononuclear cells from most immunized volunteers also produced interferon-gamma upon peptide in vitro stimulation. These vaccines appear safe, well tolerated, and immunogenic in malaria-naive volunteers. Further optimization and development of this vaccine is being attempted to conduct phase II clinical trials.
Collapse
Affiliation(s)
- Sócrates Herrera
- Instituto de Inmunología, Universidad del Valle, Cali, Colombia.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Wang R, Arevalo-Herrera M, Gardner M, Bonelo A, Carlton J, Gomez A, Vera O, Soto L, Vergara J, Bidwell S, Domingo A, Fraser C, Herrera S. Correction: Immune responses toPlasmodium vivax pre-erythrocytic stage antigens in naturally exposed Duffy-negative humans: a potential model for identification of liver-stage antigens (Vol. 35(6) 2005, DOI 10.1002/eji.200425807). Eur J Immunol 2005. [DOI: 10.1002/eji.255590571] [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: 11/07/2022]
|
13
|
Wang R, Arevalo-Herrera M, Gardner MJ, Bonelo A, Carlton JM, Gomez A, Vera O, Soto L, Vergara J, Bidwell SL, Domingo A, Fraser CM, Herrera S. Immune responses toPlasmodium vivax pre-erythrocytic stage antigens in naturally exposed Duffy-negative humans: a potential model for identification of liver-stage antigens. Eur J Immunol 2005; 35:1859-68. [PMID: 15864779 DOI: 10.1002/eji.200425807] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [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: 11/09/2022]
Abstract
Duffy antigen is the receptor used by Plasmodium vivax to invade erythrocytes. Consequently, individuals lacking Duffy antigen [Fy(-)] do not develop blood-stage infections. We hypothesized that naturally exposed Fy(-) humans may develop immune responses mainly to pre-erythrocytic stages and could be used to study acquired immunity to P. vivax and to identify liver-stage antigens. We report here that antibody and IFN-gamma responses to known sporozoite antigens were significantly induced by natural exposure in Fy(-) humans, whereas responses to blood-stage antigens were significantly induced in Fy(+) humans. IFN-gamma responses to sporozoite antigens were lower in Fy(+) than in Fy(-) humans, indicating that in Fy(+) humans blood-stage infections may have suppressed T cell responses to pre-erythrocytic stages. We evaluated the immune responses to 18 novel P. vivax homologs of P. falciparum sporozoite proteins identified from the P. vivax genome sequence. Eight proteins recalled IFN-gamma responses in P. vivax-exposed but not in unexposed individuals. Of these, 3 antigens elicited IFN-gamma responses in Fy(-) but not in Fy(+) individuals. These results suggest that differential immune responses observed in naturally exposed Fy(-) and Fy(+) individuals can be exploited to identify P. vivax stage-specific antigens.
Collapse
Affiliation(s)
- Ruobing Wang
- The Institute for Genomic Research, Rockville, USA.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Herrera S, Bonelo A, Perlaza BL, Valencia AZ, Cifuentes C, Hurtado S, Quintero G, López JA, Corradin G, Arévalo-Herrera M. Use of long synthetic peptides to study the antigenicity and immunogenicity of the Plasmodium vivax circumsporozoite protein. Int J Parasitol 2005; 34:1535-46. [PMID: 15582530 DOI: 10.1016/j.ijpara.2004.10.009] [Citation(s) in RCA: 43] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2004] [Revised: 10/04/2004] [Accepted: 10/05/2004] [Indexed: 11/19/2022]
Abstract
Three long synthetic peptides corresponding to amino (N), repeat (R) and carboxyl (C) regions of the Plasmodium vivax circumsporozoite (CS) protein were synthesised and used to assess their potential as vaccine candidates. Antigenicity studies were carried out using human blood samples from residents of a malaria-endemic area of Colombia, and immunogenicity was tested in Aotus monkeys. The N and C peptides spanned the total native amino and carboxyl flanking regions, whereas the R peptide corresponded to a construct based on the first central nona-peptide repeated in tandem three times and colinearly linked to a universal T-cell epitope (ptt-30) derived from tetanus toxin. All three peptides had been shown previously to contain several B-, T-helper (Th) and Cytotoxic T Lymphocytes (CTL) epitopes. Sixty-one percent of the human sera reacted with the R region, whereas 35 and 39% of the samples had antibodies against the N and C peptides, respectively. Human Peripheral Blood Mononuclear Cells (PBMC) showed higher levels of IFN-gamma than IL-4 when stimulated with peptides containing Th epitopes. Aotus monkeys immunised with the peptides formulated in either Montanide ISA720 or Freund's adjuvants produced strong antibody responses that recognised the peptide immunogens and the native circumsporozoite protein on sporozoites. Additionally, high IFN-gamma production was induced when Aotus lymphocytes were stimulated in vitro with each of the three peptides. We observed boosting of antibody responses and IFN-gamma production by exposure to live sporozoites. These results confirm the high antigenicity and immunogenicity of such synthetic polypeptides and underline their vaccine potential.
Collapse
Affiliation(s)
- Sócrates Herrera
- Institute of Immunology, University of Valle, AA 25574 Cali, Colombia.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Peter K, Audran R, Bonelo A, Corradin G, López JA. Assessment of antigen-specific CTL- and CD8(+)-dependent IFN-gamma responses in mice. Methods Mol Med 2003; 72:437-44. [PMID: 12125139 DOI: 10.1385/1-59259-271-6:437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Affiliation(s)
- Katrin Peter
- Institute of Biochemistry, University of Lausanne, Epalinges, Switzerland
| | | | | | | | | |
Collapse
|
16
|
Abstract
Non-human primates represent a valuable resource for testing potential vaccines candidates and drugs for human use. Malaria remains one of the greatest burdens for the humanity represented by approximately 500 million new clinical cases per year worldwide and at least two million deaths caused annually. Additional control measures such as vaccines and new anti-malarial compounds are therefore urgently needed. Safety and protective efficacy studies in animal models are critical steps for vaccines and drugs development and primate models are probably the most appropriate for this purpose. Although Aotus genus provides several species susceptible to both Plasmodium falciparum and Plasmodium vivax, having different susceptibility to malaria, Aotus lemurinus griseimembra represents the best current malaria primate model because of its high susceptibility to infection by blood forms and sporozoites of both species of Plasmodium. Although the ultimate validation of this model depends upon human trials, over the past two decades these monkeys have proved very useful to test multiple malaria vaccine candidates prior to trials in humans. A good correlation between the B- and T-cell epitopes recognised by humans and by immunised monkeys has been documented, and cross reactivity between reagents for human and Aotus cytokines and lymphocyte markers have been identified and are facilitating the selection of vaccine candidates for clinical trials. Aotus also represents a good model for the screening of anti-malarial drugs and the understanding of malaria pathogenesis as well. In view of the decreasing availability of these primates, breeding programs and biomedical research facilities must be improved in countries of primate origin.
Collapse
Affiliation(s)
- Sócrates Herrera
- Instituto de Inmunologia, Universidad del Valle, AA 25574 Cali, Colombia.
| | | | | | | |
Collapse
|
17
|
Arévalo-Herrera M, Valencia AZ, Vergara J, Bonelo A, Fleischhauer K, González JM, Restrepo JC, López JA, Valmori D, Corradin G, Herrera S. Identification of HLA-A2 restricted CD8(+) T-lymphocyte responses to Plasmodium vivax circumsporozoite protein in individuals naturally exposed to malaria. Parasite Immunol 2002; 24:161-9. [PMID: 12078650 DOI: 10.1046/j.1365-3024.2002.00449.x] [Citation(s) in RCA: 25] [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] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Specific CD8(-) T-lymphocyte (CTL) activity against Plasmodium pre-erythrocytic stages (P-ES) derived antigens is considered one of the most important mechanisms for malaria protection. Plasmodium vivax is the second most prevalent human malaria parasite species distributed worldwide. Although several CTL epitopes have been identified in Plasmodium falciparum P-ES derived antigens, none has been described for P. vivax to date. In this study, we analysed HLA-A*0201 specific CD8(-) T-lymphocyte responses to the P. vivax circumsporozoite (CS) protein in both malaria exposed and non-exposed populations from the Colombian Pacific Coast. First, we analysed the prevalence of HLA-A2 allele in the study populations and found that approximately 38 of the individuals expressed this molecule and that 50 of them were HLA-A*0201. We then selected, on the P. vivax CS, five peptide sequences containing the HLA-A*0201 binding motifs and used the corresponding synthetic peptides to evaluate the CD8(-) T-lymphocyte interferon (IFN)-gamma response. Peripheral blood mononuclear cells from the HLA-A*0201 donors were in vitro stimulated with these peptides and IFN-gamma production was determined by an ELISPOT assay. Specific CD8(-) T-lymphocyte responses were detected for three peptides located in the C-terminal region of the protein. Specific responses to these peptides were also detected in several individuals expressing different HLA-A*02 subtypes. The potential of these peptides to induce specific cytolysis and that of long synthetic peptides comprising these epitopes as P. vivax malaria vaccine subunits are being studied.
Collapse
|
18
|
López JA, Weilenman C, Audran R, Roggero MA, Bonelo A, Tiercy JM, Spertini F, Corradin G. A synthetic malaria vaccine elicits a potent CD8(+) and CD4(+) T lymphocyte immune response in humans. Implications for vaccination strategies. Eur J Immunol 2001; 31:1989-98. [PMID: 11449351 DOI: 10.1002/1521-4141(200107)31:7<1989::aid-immu1989>3.0.co;2-m] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We report the first synthetic peptide vaccine eliciting strong CD8(+) and CD4(+) T lymphocyte responses in humans. The vaccine, representing the C-terminal region of the circumsporozoite protein of Plasmodium falciparum (amino acids 282-383) was well tolerated and strong sporozoite-specific antibodies were elicited. In addition, robust lymphocyte proliferation responses were equally elicited with concomitant in vitro production of IFN-gamma, crucial in the elimination of the parasite. Most importantly, we also observed the development of CD8(+) T lymphocyte responses decisive in the immunity to malaria. The latter finding opens new, possibly safer, avenues for vaccination strategies when a CD8(+) T cell response is needed.
Collapse
Affiliation(s)
- J A López
- Institute of Biochemistry, University of Lausanne, Epalinges, Switzerland
| | | | | | | | | | | | | | | |
Collapse
|
19
|
López J, Weilenman C, Audran R, Roggero M, Bonelo A, Tiercy JM, Spertini F, Corradin G. A synthetic malaria vaccine elicits a potent CD8+ and CD4+ T lymphocyte immune response in humans. Implications for vaccination strategies. Eur J Immunol 2001. [DOI: 10.1002/1521-4141(200107)31:7<1989::aid-immu1989>3.0.co;2-m] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
20
|
Bonelo A, Valmori D, Triponez F, Tiercy JM, Mentha G, Oberholzer J, Champagne P, Romero JF, Esposito F, Nebié I, Barbey C, Romero P, Herrera S, Corradin G, López JA. Generation and characterization of malaria-specific human CD8(+) lymphocyte clones: effect of natural polymorphism on T cell recognition and endogenous cognate antigen presentationby liver cells. Eur J Immunol 2000; 30:3079-88. [PMID: 11093122 DOI: 10.1002/1521-4141(200011)30:11<3079::aid-immu3079>3.0.co;2-7] [Citation(s) in RCA: 32] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
CD8(+) cytolytic T lymphocytes (CTL) play a fundamental role in the clearance of malaria parasites from the liver in mouse models. In humans, however, only low levels of parasite-specific CD8(+) T lymphocytes have been observed in individuals living in endemic areas. In the present study, we identified high levels of circulating CD8(+) T lymphocytes specific for a previously described HLA-A2-restricted CTL epitope of the circumsporozoite (CS) protein of Plasmodium falciparum in an adult living in Burkina Faso, as evidenced by IFN-gamma ELISPOT assay and MHC-tetramer technology. After cloning by limiting dilution culture, T cell recognition of natural CS variants of P. falciparum was studied. The results demonstrate that naturally occurring variations drastically affect residues critical for T cell recognition as only two out of nine sequences analyzed were efficiently recognized by the CTL clones. These clones were also used to analyze T cell recognition of the endogenously presented cognate antigen. We observed efficient antigen recognition of both HLA-A*0201-transfected murine antigen presenting cells and liver cells from HLA-A*0201/K(b)-transgenic mice upon infection with recombinant vaccinia virus encoding the CS protein (WR-CS). More importantly, we demonstrate for the first time efficient recognition of WR-CS-infected human liver cells.
Collapse
Affiliation(s)
- A Bonelo
- Institute of Biochemistry, University of Lausanne, Epalinges, Switzerland
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
González JM, Peter K, Esposito F, Nebié I, Tiercy JM, Bonelo A, Arévalo-Herrera M, Valmori D, Romero P, Herrera S, Corradin G, López JA. HLA-A*0201 restricted CD8+ T-lymphocyte responses to malaria: identification of new Plasmodium falciparum epitopes by IFN-gamma ELISPOT. Parasite Immunol 2000; 22:501-14. [PMID: 11012976 DOI: 10.1046/j.1365-3024.2000.00331.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [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: 11/20/2022]
Abstract
The role of antigen specific CD8+ T-lymphocytes in mediating protection against sporozoite-induced malaria has been well established in murine models. In humans, indirect evidence has accumulated suggesting a similar protective role for antigen-specific CD8+ T-lymphocytes. Nevertheless, the low frequency of circulating specific cells together with the lack of sensitive methods to quantify them has hampered the direct assessment of their function. Using a combination of short-term cell culture and IFN-gamma ELISPOT, we studied CD8+ T-lymphocyte responses to a panel of HLA-A*0201 binding peptides. In addition to confirming the response to already described epitopes, we also identified five new CD8+ T-lymphocyte epitopes. These epitopes are presented in pre-erythrocytic stages gene products of Plasmodium falciparum 7G8 strain and correspond to the following protein segments: circumsporozoite (CS) 64-72, 104-113, 299-308 and 403-411; liver stage antigen (LSA-1) repeat region; sporozoite surface protein 2 or thrombospondin related anonymous protein (SSP2/TRAP) 78-88 and 504-513. Four of these peptides are conserved amongst all published sequences of P. falciparum strains. We conclude that the modified IFN-gamma ELISPOT assay is a sensitive technique to monitor antigen-specific CD8+ T-lymphocyte responses in human malaria which may help in the improvement and assessment of the efficacy of malaria subunit vaccines.
Collapse
Affiliation(s)
- J M González
- Instituto de Inmunología del Valle, Universidad del Valle, Cali, Colombia
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Roggero MA, Weilenmann C, Bonelo A, Audran R, Renggli J, Spertini F, Corradin G, López JA. Plasmodium falciparum CS C-terminal fragment: preclinical evaluation and phase I clinical studies. Parassitologia 1999; 41:421-4. [PMID: 10697896] [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: 02/15/2023]
Abstract
Preclinical evaluation of synthetic peptides corresponding to the C-terminal regions of the circumsporozoite (CS) protein in various Plasmodia showed that these preparations were immunogenic and safe upon injection in various animal models. Additionally, the corresponding peptide from Plasmodium falciparum was widely recognized by sera and PBL obtained from semi-immune adults living in malaria endemic areas. Moreover, the CS C-terminal peptide derived from P. berghei conferred protection upon challenge with live sporozoites in mice. A GLP preparation of the synthetic peptide corresponding to residues 282-383 of the Pf CS, NF-54 strain is currently evaluated in a open, non-randomized, Phase I human trial. Data obtained after the second antigen injection show that the malaria vaccine Pf CS 282-383 is safe, well tolerated and gives rise to high antibody titre, CD4+ and CD8+ lymphocyte responses.
Collapse
Affiliation(s)
- M A Roggero
- Institut de Biochimie, Université de Lausanne, Switzerland
| | | | | | | | | | | | | | | |
Collapse
|
23
|
Valmori D, Gervois N, Rimoldi D, Fonteneau JF, Bonelo A, Liénard D, Rivoltini L, Jotereau F, Cerottini JC, Romero P. Diversity of the fine specificity displayed by HLA-A*0201-restricted CTL specific for the immunodominant Melan-A/MART-1 antigenic peptide. J Immunol 1998; 161:6956-62. [PMID: 9862730] [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: 02/09/2023]
Abstract
HLA-A*0201 melanoma patients often develop a CTL response to an immunodominant peptide derived from the melanocyte lineage-specific protein Melan-A/MART-1. We have shown previously that the antigenic peptide most often involved is the decapeptide Melan-A(26-35) (EAAGIGILTV). We also observed some clonal diversity in the fine specificity of Melan-A-specific CTL. To substantiate this observation, we have now tested a series of Melan-A(26-35) variant peptides containing single alanine substitutions for binding to HLA-A*0201 and recognition by polyclonal and monoclonal Melan-A-specific CTL. Substitution of several residues with alanine reduced peptide binding activity by > 10-fold. In contrast, substitution of E26 with alanine (AAAGIGILTV) resulted in a 5-fold higher binding activity as well as in stronger stability of the corresponding HLA-A*0201/peptide complexes. Interestingly, the peptide variant AAAGIGILTV was recognized more efficiently than the natural decapeptide by short term cultured, tumor-infiltrated lymph node cell cultures and a number of Melan-A-specific CTL clones derived from different individuals. Moreover, this analysis revealed that the fine specificity of the CTL response to the Melan-A immunodominant epitope is quite diverse at the clonal level. At least three distinct patterns of fine specificity were identified. This diversity appears to reflect the diversity of the TCR repertoire available for this Ag, since similar results were obtained with a panel of Melan-A-specific CTL clones derived from a single melanoma patient. These findings have important implications for the formulation of Melan-A peptide-based vaccines as well as for the monitoring of Melan-A-specific CTL responses in melanoma patients.
Collapse
Affiliation(s)
- D Valmori
- Division of Clinical Onco-Immunology, Ludwig Institute for Cancer Research, University Hospital, Lausanne, Switzerland
| | | | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Valmori D, Gervois N, Rimoldi D, Fonteneau JF, Bonelo A, Liénard D, Rivoltini L, Jotereau F, Cerottini JC, Romero P. Diversity of the Fine Specificity Displayed by HLA-A*0201-Restricted CTL Specific for the Immunodominant Melan-A/MART-1 Antigenic Peptide. The Journal of Immunology 1998. [DOI: 10.4049/jimmunol.161.12.6956] [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: 12/31/2022]
Abstract
Abstract
HLA-A*0201 melanoma patients often develop a CTL response to an immunodominant peptide derived from the melanocyte lineage-specific protein Melan-A/MART-1. We have shown previously that the antigenic peptide most often involved is the decapeptide Melan-A26–35 (EAAGIGILTV). We also observed some clonal diversity in the fine specificity of Melan-A-specific CTL. To substantiate this observation, we have now tested a series of Melan-A26–35 variant peptides containing single alanine substitutions for binding to HLA-A*0201 and recognition by polyclonal and monoclonal Melan-A-specific CTL. Substitution of several residues with alanine reduced peptide binding activity by >10-fold. In contrast, substitution of E26 with alanine (AAAGIGILTV) resulted in a 5-fold higher binding activity as well as in stronger stability of the corresponding HLA-A*0201/peptide complexes. Interestingly, the peptide variant AAAGIGILTV was recognized more efficiently than the natural decapeptide by short term cultured, tumor-infiltrated lymph node cell cultures and a number of Melan-A-specific CTL clones derived from different individuals. Moreover, this analysis revealed that the fine specificity of the CTL response to the Melan-A immunodominant epitope is quite diverse at the clonal level. At least three distinct patterns of fine specificity were identified. This diversity appears to reflect the diversity of the TCR repertoire available for this Ag, since similar results were obtained with a panel of Melan-A-specific CTL clones derived from a single melanoma patient. These findings have important implications for the formulation of Melan-A peptide-based vaccines as well as for the monitoring of Melan-A-specific CTL responses in melanoma patients.
Collapse
Affiliation(s)
- Danila Valmori
- *Division of Clinical Onco-Immunology, Ludwig Institute for Cancer Research, University Hospital, Lausanne, Switzerland
| | - Nadine Gervois
- †Unit 463, Institut National de la Santé et de la Recherche Médicale, Nantes, France
| | - Donata Rimoldi
- ‡Ludwig Institute for Cancer Research, Lausanne Branch, University of Lausanne, Epalinges, Switzerland
| | | | - Anilza Bonelo
- §Instituto de Inmunologia, Universidad del Valle, Cali, Colombia
| | - Danielle Liénard
- *Division of Clinical Onco-Immunology, Ludwig Institute for Cancer Research, University Hospital, Lausanne, Switzerland
- ¶Centre Pluridisciplinaire d’Oncologie, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland; and
| | - Licia Rivoltini
- ∥Department of Experimental Oncology, Istituto Nazionale Tumori, Milan, Italy
| | - Francine Jotereau
- †Unit 463, Institut National de la Santé et de la Recherche Médicale, Nantes, France
| | - Jean-Charles Cerottini
- *Division of Clinical Onco-Immunology, Ludwig Institute for Cancer Research, University Hospital, Lausanne, Switzerland
- ‡Ludwig Institute for Cancer Research, Lausanne Branch, University of Lausanne, Epalinges, Switzerland
| | - Pedro Romero
- *Division of Clinical Onco-Immunology, Ludwig Institute for Cancer Research, University Hospital, Lausanne, Switzerland
- ‡Ludwig Institute for Cancer Research, Lausanne Branch, University of Lausanne, Epalinges, Switzerland
| |
Collapse
|