1
|
Ponnuvel S, Fletcher GJ, Anantharam R, Varughese S, David VG, Abraham P. Clinical utility of hepatitis C virus core antigen (HCVcAg) assay to identify active HCV infection in hemodialysis and renal transplant patients. PLoS One 2021; 16:e0250263. [PMID: 33886631 PMCID: PMC8061997 DOI: 10.1371/journal.pone.0250263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 04/03/2021] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND The prevalence of HCV infection is high and it is a major cause of liver-related morbidity and mortality in hemodialysis and renal transplant patients. Diagnosis of hepatitis C virus (HCV) infection requires both HCV antibody screening and confirmatory nucleic acid testing (NAT). Hepatitis C virus core antigen (HCVcAg) is a reliable direct viral marker to identify active HCV infection. AIM To assess the clinical utility of HCV core antigen to identify active HCV infection in hemodialysis and renal transplant patients. METHODS A representative total of 231 plasma samples with a predominance of low viral load were included for HCVcAg testing and its performance characteristics were compared with the gold standard HCV RNA. RESULTS Comparison of HCVcAg with HCV RNA showed an excellent specificity of 99% (95% CI: 94.7 to 100%) and sensitivity of 80.62% (95% CI: 73.59 to 87.7%). Likewise, the PPV and NPV of HCVcAg were 99.1% (95% CI: 93.7% to 99.9%) and 80.2% (95% CI: 74% to 85.2%) respectively. The correlation between HCVcAg and HCV RNA was found to be good (R2 = 0.86, p<0.0001). Among common Indian HCV genotypes (1, 3 & 4), good correlation was observed between HCV RNA and HCVcAg (R2 = 0.81, p <0.0001). CONCLUSIONS It is the first Indian study to show that HCVcAg is a reliable, cost-effective direct marker to identify active HCV infection in hemodialysis and renal transplant patients. Implementation of HCVcAg testing could improve the accessibility to efficacious and affordable disease management in hemodialysis and renal transplant patients. In HCVcAg negative cases, sequential testing with anti-HCV antibody followed by HCV RNA could be a reliable and cost-effective approach.
Collapse
Affiliation(s)
- Suresh Ponnuvel
- Department of Clinical Virology, Christian Medical College, Vellore, Tamil Nadu, India
| | | | | | - Santosh Varughese
- Department of Nephrology, Christian Medical College, Vellore, Tamil Nadu, India
| | - Vinoy George David
- Department of Nephrology, Christian Medical College, Vellore, Tamil Nadu, India
| | - Priya Abraham
- Department of Clinical Virology, Christian Medical College, Vellore, Tamil Nadu, India
- * E-mail:
| |
Collapse
|
2
|
Femia AL, Gonzalez VDG, Garcia VS, Gugliotta LM. Carboxyl fuchsine-based colored particles for application to immunodetection. INT J POLYM MATER PO 2021. [DOI: 10.1080/00914037.2021.1876056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
| | - Verónica D. G. Gonzalez
- INTEC, UNL-CONICET, Santa Fe, Argentina
- Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Ciudad Universitaria, Santa Fe, Argentina
| | | | - Luis M. Gugliotta
- INTEC, UNL-CONICET, Santa Fe, Argentina
- Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santa Fe, Argentina
| |
Collapse
|
3
|
Peretti LE, Gonzalez VDG, Clementi LA, Gugliotta LM. Latex particles by emulsion and dispersion polymerizations: sensitization with specific antigens of leptospirosis and application to immunoagglutination. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2020. [DOI: 10.1007/s43153-020-00080-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
4
|
ELISA assay employing epitope-specific monoclonal antibodies to quantify circulating HER2 with potential application in monitoring cancer patients undergoing therapy with trastuzumab. Sci Rep 2020; 10:3016. [PMID: 32080226 PMCID: PMC7033231 DOI: 10.1038/s41598-020-59630-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Accepted: 01/02/2020] [Indexed: 11/08/2022] Open
Abstract
Circulating HER2 extracellular domain (HER2 ECD) levels were proposed as a surrogate for HER2 tissue expression to monitor breast cancer patients for early relapse or responses to standard or HER2-targeted therapies, such as the monoclonal antibody (mAb) trastuzumab. Currently, available commercial ELISA assays for HER2 ECD rely on antibodies recognizing undisclosed or unknown epitopes. In this work, two ELISA assays employing MGR2 and MGR3 epitope-specific mAbs for HER2 ECD were developed and validated, showing good assay precision and linearity of the dose-response signal within the dynamic range of 0.19-12.50 ng mL-1 and detection limits of 0.76 and 0.75 ng mL-1 for the MGR2 and MGR3 assays, respectively. The developed assay showed a good agreement with two widely used commercial kits for HER2 ECD quantification in serum samples from breast cancer patients. A complete characterization of mAb-HER2 ECD interaction was performed by means of surface plasmon resonance using trastuzumab as control for both epitope mapping and kinetics analysis. The epitopes recognized by the two mAbs showed no overlap with trastuzumab, which was confirmed by trastuzumab interference analysis in serum samples. The method showed to be a practical approach to determine HER2 ECD with a high degree of sensitivity, reliability and recovery in samples containing mAbs-based therapies.
Collapse
|
5
|
Evaluation of carboxyl beads based latex agglutination test for rapid sero-diagnosis of Japanese encephalitis. Biologicals 2019; 62:72-76. [PMID: 31519538 DOI: 10.1016/j.biologicals.2019.09.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/04/2019] [Accepted: 09/05/2019] [Indexed: 11/21/2022] Open
Abstract
Japanese encephalitis (JE) is a major public health problem in the South Asian countries including India. Pigs serve as a relevant sentinel model, the surveillance of which could predict a potential JE outbreak in human population nearby. However, existing serological detection methods like Enzyme-Linked Immuno Sorbent Assay (ELISA), virus neutralization test (VNT) and Haemagglutination Inhibition (HI) require elaborative laboratory facilities which are invariably not available in field conditions. Recognizing the lacunae, attempts were made to develop recombinant antigen (rNS1) based latex agglutination test (LAT) as a rapid on-site test using covalent coupling method. Four different formats were evaluated using different coupling buffers, blocking buffers and reaction conditions. The format in which borate buffer at alkaline pH (8.5) was used for coupling of antigen with carboxylated beads followed by blocking with skimmed milk powder was found to be the best amongst all. Developed latex based test was used for screening of 207 pig serum samples for JE which revealed relative diagnostic sensitivity and specificity of 80.2% and 95.2%, respectively in comparison with indirect IgG ELISA. Hence, the present study demonstrated that covalently coupled recombinant antigen based LAT could be used as a reliable screening test for surveillance of JE in pigs under field conditions.
Collapse
|
6
|
Femia AL, Gonzalez VDG, Garcia V, Gugliotta LM. Polymerizable dye for colored particles synthesis with potential use in immunoassays. INT J POLYM MATER PO 2019. [DOI: 10.1080/00914037.2019.1616202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
| | | | | | - Luis M. Gugliotta
- INTEC (UNL- CONICET), Santa Fe, Argentina
- Faculty of Chemical Engineering, UNL, Santa Fe, Argentina
| |
Collapse
|
7
|
He S, Li X, Gao J, Tong P, Chen H. Development of sandwich ELISA for testing bovine β-lactoglobulin allergenic residues by specific polyclonal antibody against human IgE binding epitopes. Food Chem 2017; 227:33-40. [DOI: 10.1016/j.foodchem.2017.01.060] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Revised: 01/01/2017] [Accepted: 01/13/2017] [Indexed: 01/01/2023]
|
8
|
Diagnosis of toxoplasmosis in pregnancy. Evaluation of latex–protein complexes by immnunoagglutination. Parasitology 2017; 144:1073-1078. [DOI: 10.1017/s0031182017000294] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
SUMMARYThe aim of this work was to obtain a reagent based on latex particles for ruling out acute toxoplasmosis in pregnant women by immunoagglutination (IA). Latex–protein complexes (LPC) were previously synthesized coupling the recombinant protein ofToxoplasma gondiiP22Ag and the homogenate of the parasite to latex particles with different size, chemical functionality and charge density. LPC were tested in IA assays against a panel of 72 pregnant women serum samples. Results were analysed through receiver operating characteristic curves, determining area under the curve (AUC), sensitivity, specificity positive and negative predictive values (PPV and NPV, respectively). It was observed that the antigenicity of proteins was not affected during sensitization by either physical adsorption or covalent coupling. The best results in the sense of maximizing discrimination of low avidity sera from chronic ones were observed for the IA test based on latex particles with carboxyl functionality and the recombinant P22Ag, obtaining an AUC of 0·94, a sensitivity of 100% and a NPV of 100%. In this way, the proposed test could be useful for the toxoplasmosis diagnosis in pregnant women, with the advantages of being cheap, rapid and easy to be implemented.
Collapse
|
9
|
Prochetto SD, Gonzalez VDG, Garcia VS, Vanasco NB, Lottersberger J, Gugliotta LM. Latex particles sensitized with proteins ofLeptospira interrogansfor application in immunoagglutination assays. INT J POLYM MATER PO 2017. [DOI: 10.1080/00914037.2016.1276058] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Santiago D. Prochetto
- INTEC, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional del Litoral, Santa Fe, Argentina
| | - Verónica D. G. Gonzalez
- INTEC, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional del Litoral, Santa Fe, Argentina
- Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Santa Fe, Argentina
| | - Valeria S. Garcia
- INTEC, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional del Litoral, Santa Fe, Argentina
| | - Norma B. Vanasco
- Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Santa Fe, Argentina
- Administración Nacional de Laboratorios e Institutos de Salud “Dr. Carlos G. Malbran,” Instituto Nacional de Enfermedades Respiratorias “Dr. Emilio Coni,” Santa Fe, Argentina
| | - Javier Lottersberger
- Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Santa Fe, Argentina
| | - Luis M. Gugliotta
- INTEC, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional del Litoral, Santa Fe, Argentina
| |
Collapse
|
10
|
Peretti LE, Gonzalez VDG, Costa JG, Marcipar IS, Gugliotta LM. Synthesis and characterization of latex-protein complexes from different antigens ofToxoplasma gondiifor immunoagglutination assays. INT J POLYM MATER PO 2016. [DOI: 10.1080/00914037.2016.1180611] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
11
|
Cellulose fibers modified with nano-sized antimicrobial polymer latex for pathogen deactivation. Carbohydr Polym 2016; 135:94-100. [DOI: 10.1016/j.carbpol.2015.08.046] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 08/10/2015] [Accepted: 08/17/2015] [Indexed: 01/20/2023]
|
12
|
Garcia VS, Gonzalez VDG, Marcipar IS, Gugliotta LM. Immunoagglutination test to diagnose Chagas disease: comparison of different latex-antigen complexes. Trop Med Int Health 2014; 19:1346-54. [PMID: 25175083 DOI: 10.1111/tmi.12379] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To evaluate the diagnostic performance of novel latex-protein complexes obtained from different antigens of Trypanosoma cruzi through immunoagglutination test using a panel of T. cruzi-positive sera, leishmaniasis-positive sera and negative sera for both parasites. METHODS Complexes' behaviour using total parasite homogenate (TPH), two simple recombinant proteins (RP1 and RP5) and two chimeric recombinant proteins (CP1 and CP2) was comparatively evaluated. The area under ROC curves was used as an index of accuracy. Sensitivity, specificity and discrimination efficiency were assessed. RESULTS All recombinant antigens showed higher specificity than TPH. The lower specificity of TPH was mainly due to cross-reacting peptides between T. cruzi and Leishmania spp. In turn, all performance indicators were higher for CP1 and CP2 than for RP1 and RP5. The carboxylated latex-CP2 (C2-CP2) complex was able to detect antibodies against T. cruzi. The values of area under ROC curve (0.96), sensitivity (92.3%, 95% CI: 79.4-100.0%) and specificity (84.0%, 95% CI: 67.6-100.0%) indicate that the assay could be used as a screening test. CONCLUSION The C2-CP2 complex could be an important tool to carry out sero-epidemiological studies.
Collapse
Affiliation(s)
- Valeria S Garcia
- INTEC (Universidad Nacional del Litoral and CONICET), Santa Fe, Argentina
| | | | | | | |
Collapse
|