1
|
Wyatt RC, Grace SL, Brigatti C, Marzinotto I, Gillard BT, Shoemark DK, Chandler K, Achenbach P, Piemonti L, Long AE, Gillespie KM, Lampasona V, Williams AJ. Improved Specificity of Glutamate Decarboxylase 65 Autoantibody Measurement Using Luciferase-Based Immunoprecipitation System Assays. Diabetes 2024; 73:565-571. [PMID: 38232306 PMCID: PMC10958581 DOI: 10.2337/db23-0550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Accepted: 12/23/2023] [Indexed: 01/19/2024]
Abstract
Autoantibodies to glutamate decarboxylase (GADA) are widely used in the prediction and classification of type 1 diabetes. GADA radiobinding assays (RBAs) using N-terminally truncated antigens offer improved specificity, but radioisotopes limit the high-throughput potential for population screening. Luciferase-based immunoprecipitation system (LIPS) assays are sensitive and specific alternatives to RBAs with the potential to improve risk stratification. The performance of assays using the Nanoluc luciferase (Nluc)-conjugated GAD65 constructs, Nluc-GAD65(96-585) and full length Nluc-GAD65(1-585), were evaluated in 434 well-characterized serum samples from patients with recent-onset type 1 diabetes and first-degree relatives. Nonradioactive, high-throughput LIPS assays are quicker and require less serum than RBAs. Of 171 relatives previously tested single autoantibody positive for autoantibodies to full-length GAD65 by RBA but had not progressed to diabetes, fewer retested positive by LIPS using either truncated (n = 72) or full-length (n = 111) antigen. The Nluc-GAD65(96-585) truncation demonstrated the highest specificity in LIPS assays overall, but in contrast to RBA, N-terminus truncations did not result in a significant increase in disease-specificity compared with the full-length antigen. This suggests that binding of nonspecific antibodies is affected by the conformational changes resulting from addition of the Nluc antigen. Nluc-GAD65(96-585) LIPS assays offer low-blood-volume, high-specificity GADA tests for screening and diagnostics. ARTICLE HIGHLIGHTS
Collapse
Affiliation(s)
- Rebecca C. Wyatt
- Diabetes and Metabolism Unit, Translational Health Sciences, University of Bristol, Bristol, U.K
| | - Sian L. Grace
- Diabetes and Metabolism Unit, Translational Health Sciences, University of Bristol, Bristol, U.K
| | - Cristina Brigatti
- San Raffaele Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Ilaria Marzinotto
- San Raffaele Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Ben T. Gillard
- Diabetes and Metabolism Unit, Translational Health Sciences, University of Bristol, Bristol, U.K
| | | | - Kyla Chandler
- Diabetes and Metabolism Unit, Translational Health Sciences, University of Bristol, Bristol, U.K
| | - Peter Achenbach
- Institute of Diabetes Research, Helmholtz Munich, German Center for Environmental Health, Munich, Germany
- Technical University of Munich, School of Medicine, Klinikum rechts der Isar, Forschergruppe Diabetes, Munich, Germany
| | - Lorenzo Piemonti
- Division of Genetics and Cell Biology, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Anna E. Long
- Diabetes and Metabolism Unit, Translational Health Sciences, University of Bristol, Bristol, U.K
| | - Kathleen M. Gillespie
- Diabetes and Metabolism Unit, Translational Health Sciences, University of Bristol, Bristol, U.K
| | - Vito Lampasona
- Division of Genetics and Cell Biology, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Alistair J.K. Williams
- Diabetes and Metabolism Unit, Translational Health Sciences, University of Bristol, Bristol, U.K
| |
Collapse
|
2
|
Williams CL, Marzinotto I, Brigatti C, Gillespie KM, Lampasona V, Williams AJK, Long AE. A novel, high-performance, low-volume, rapid luciferase immunoprecipitation system (LIPS) assay to detect autoantibodies to zinc transporter 8. Clin Exp Immunol 2024; 215:215-224. [PMID: 38150393 PMCID: PMC10876106 DOI: 10.1093/cei/uxad139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 12/01/2023] [Accepted: 12/24/2023] [Indexed: 12/29/2023] Open
Abstract
BACKGROUND Zinc transporter 8 autoantibodies (ZnT8A) are thought to appear close to type 1 diabetes (T1D) onset and can identify high-risk multiple (≥2) autoantibody positive individuals. Radiobinding assays (RBA) are widely used for ZnT8A measurement but have limited sustainability. We sought to develop a novel, high-performance, non-radioactive luciferase immunoprecipitation system (LIPS) assay to replace RBA. METHODS A custom dual C-terminal ZnT8 (aa268-369; R325/W325) heterodimeric antigen, tagged with a NanoluciferaseTM (Nluc-ZnT8) reporter, and LIPS assay was developed. Assay performance was evaluated by testing sera from new onset T1D (n = 573), healthy schoolchildren (n = 521), and selected first-degree relatives (FDRs) from the Bart's Oxford family study (n = 617; 164 progressed to diabetes). RESULTS In new-onset T1D, ZnT8A levels by LIPS strongly correlated with RBA (Spearman's r = 0.89; P < 0.0001), and positivity was highly concordant (94.3%). At a high specificity (95%), LIPS and RBA had comparable assay performance [LIPS pROC-AUC(95) 0.032 (95% CI: 0.029-0.036); RBA pROC-AUC(95) 0.031 (95% CI: 0.028-0.034); P = 0.376]. Overall, FDRs found positive by LIPS or RBA had a comparable 20-year diabetes risk (52.6% and 59.7%, respectively), but LIPS positivity further stratified T1D risk in FDRs positive for at least one other islet autoantibody detected by RBA (P = 0.0346). CONCLUSION This novel, high-performance, cheaper, quicker, higher throughput, low blood volume Nluc-ZnT8 LIPS assay is a safe, non-radioactive alternative to RBA with enhanced sensitivity and ability to discriminate T1D progressors. This method offers an advanced approach to current strategies to screen the general population for T1D risk for immunotherapy trials and to reduce rates of diabetic ketoacidosis at diagnosis.
Collapse
Affiliation(s)
- Claire L Williams
- Translational Health Sciences, Bristol Medical School, University of Bristol, Southmead Hospital, Bristol, UK
| | - Ilaria Marzinotto
- San Raffaele Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Cristina Brigatti
- San Raffaele Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Kathleen M Gillespie
- Translational Health Sciences, Bristol Medical School, University of Bristol, Southmead Hospital, Bristol, UK
| | - Vito Lampasona
- San Raffaele Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Alistair J K Williams
- Translational Health Sciences, Bristol Medical School, University of Bristol, Southmead Hospital, Bristol, UK
| | - Anna E Long
- Translational Health Sciences, Bristol Medical School, University of Bristol, Southmead Hospital, Bristol, UK
| |
Collapse
|
3
|
de Jesus Cortez F, Lind A, Ramelius A, Bennet R, Robinson PV, Seftel D, Gebhart D, Tandel D, Maziarz M, Agardh D, Larsson HE, Lundgren M, Lernmark Å, Tsai CT. Multiplex agglutination-PCR (ADAP) autoantibody assays compared to radiobinding autoantibodies in type 1 diabetes and celiac disease. J Immunol Methods 2022; 506:113265. [DOI: 10.1016/j.jim.2022.113265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 03/23/2022] [Accepted: 03/24/2022] [Indexed: 10/18/2022]
|
4
|
So M, Speake C, Steck AK, Lundgren M, Colman PG, Palmer JP, Herold KC, Greenbaum CJ. Advances in Type 1 Diabetes Prediction Using Islet Autoantibodies: Beyond a Simple Count. Endocr Rev 2021; 42:584-604. [PMID: 33881515 DOI: 10.1210/endrev/bnab013] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Indexed: 02/06/2023]
Abstract
Islet autoantibodies are key markers for the diagnosis of type 1 diabetes. Since their discovery, they have also been recognized for their potential to identify at-risk individuals prior to symptoms. To date, risk prediction using autoantibodies has been based on autoantibody number; it has been robustly shown that nearly all multiple-autoantibody-positive individuals will progress to clinical disease. However, longitudinal studies have demonstrated that the rate of progression among multiple-autoantibody-positive individuals is highly heterogenous. Accurate prediction of the most rapidly progressing individuals is crucial for efficient and informative clinical trials and for identification of candidates most likely to benefit from disease modification. This is increasingly relevant with the recent success in delaying clinical disease in presymptomatic subjects using immunotherapy, and as the field moves toward population-based screening. There have been many studies investigating islet autoantibody characteristics for their predictive potential, beyond a simple categorical count. Predictive features that have emerged include molecular specifics, such as epitope targets and affinity; longitudinal patterns, such as changes in titer and autoantibody reversion; and sequence-dependent risk profiles specific to the autoantibody and the subject's age. These insights are the outworking of decades of prospective cohort studies and international assay standardization efforts and will contribute to the granularity needed for more sensitive and specific preclinical staging. The aim of this review is to identify the dynamic and nuanced manifestations of autoantibodies in type 1 diabetes, and to highlight how these autoantibody features have the potential to improve study design of trials aiming to predict and prevent disease.
Collapse
Affiliation(s)
- Michelle So
- Diabetes Clinical Research Program, and Center for Interventional Immunology, Benaroya Research Institute at Virginia Mason, Seattle, WA 98101, USA
| | - Cate Speake
- Diabetes Clinical Research Program, and Center for Interventional Immunology, Benaroya Research Institute at Virginia Mason, Seattle, WA 98101, USA
| | - Andrea K Steck
- Barbara Davis Center for Diabetes, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Markus Lundgren
- Department of Clinical Sciences Malmö, Lund University, Malmö 22200, Sweden
| | - Peter G Colman
- Department of Diabetes and Endocrinology, Royal Melbourne Hospital, Melbourne, Victoria 3050, Australia
| | - Jerry P Palmer
- VA Puget Sound Health Care System, Department of Medicine, University of Washington, Seattle, WA 98108, USA
| | - Kevan C Herold
- Department of Immunobiology, and Department of Internal Medicine, Yale University, New Haven, CT 06520, USA
| | - Carla J Greenbaum
- Diabetes Clinical Research Program, and Center for Interventional Immunology, Benaroya Research Institute at Virginia Mason, Seattle, WA 98101, USA
| |
Collapse
|
5
|
Lahner E, Marzinotto I, Lampasona V, Dottori L, Bazzigaluppi E, Brigatti C, Secchi M, Piemonti L, Conti L, Pilozzi E, Davidson HW, Wenzlau JM, Annibale B. Autoantibodies Toward ATP4A and ATP4B Subunits of Gastric Proton Pump H+,K+-ATPase Are Reliable Serological Pre-endoscopic Markers of Corpus Atrophic Gastritis. Clin Transl Gastroenterol 2020; 11:e00240. [PMID: 33031196 PMCID: PMC7544173 DOI: 10.14309/ctg.0000000000000240] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
INTRODUCTION Noninvasive assessment of corpus atrophic gastritis (CAG), a condition at increased risk of gastric cancer, is based on the measurement of pepsinogens, gastrin, and Helicobacter pylori antibodies. Parietal cell autoantibodies (PCAs) against the gastric proton pump (ATP4) are potential serological biomarkers of CAG. The purpose of this study was to compare the diagnostic performance of PCA and pepsinogen I tests in patients with clinical suspicion of CAG with the histopathological evaluation of gastric biopsies as reference standard. METHODS A prospective case-finding study was performed on 218 naive adult patients (131 women, median age 65 years) who underwent gastric biopsies to confirm/exclude CAG. Patients with histopathological CAG were defined as cases, conversely as controls. Autoantibodies against the individual alpha (ATP4A) and beta (ATP4B) subunits of ATP4 were measured by luciferase immunoprecipitation, and global PCA and pepsinogen I by enzyme-linked immunosorbent assay. RESULTS Histopathology classified 107 subjects (49%) as cases (CAG+, autoimmune 81.2%, and multifocal extensive 18.8%) and 111 subjects (51%) as controls (CAG-). In cases, ATP4A, ATP4B, and PCA titers were increased compared with controls, whereas pepsinogen I was reduced (P < 0.0001 for all). ATP4B, ATP4A, and pepsinogen I tests showed sensitivities of 77%, 75%, and 73% and specificities of 88%, 88%, and 80%, respectively. The receiver operating characteristic (ROC) area under the ROC curve (AUC) of these serological biomarkers confirmed their ability to discriminate cases from controls (ATP4B = 0.838, ATP4A = 0.826, pepsinogen I = 0.775, and PCA = 0.805), whereas the partial ROC-pAUC90 analysis showed that the ATP4B test had the best diagnostic performance (P = 0.008 vs ATP4; P = 0.0002 vs pepsinogen I). The presence of autoimmune or extensive gastritis was not significantly different between ATP4B positive or negative cases (P = 0.217). DISCUSSION PCAs are promising serological biomarkers for the identification of CAG in high-risk individuals, particularly in an autoimmune pattern but also in an extensive-multifocal atrophy pattern.
Collapse
Affiliation(s)
- Edith Lahner
- Medical-Surgical Department of Clinical Sciences and Translational Medicine, Sant'Andrea Hospital, University Sapienza, Rome, Italy
| | - Ilaria Marzinotto
- San Raffaele Diabetes Research Institute, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Vito Lampasona
- San Raffaele Diabetes Research Institute, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Ludovica Dottori
- Medical-Surgical Department of Clinical Sciences and Translational Medicine, Sant'Andrea Hospital, University Sapienza, Rome, Italy
| | - Elena Bazzigaluppi
- San Raffaele Diabetes Research Institute, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Cristina Brigatti
- San Raffaele Diabetes Research Institute, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Massimiliano Secchi
- San Raffaele Diabetes Research Institute, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Lorenzo Piemonti
- San Raffaele Diabetes Research Institute, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Laura Conti
- Medical-Surgical Department of Clinical Sciences and Translational Medicine, Sant'Andrea Hospital, University Sapienza, Rome, Italy
| | | | - Howard W. Davidson
- Barbara Davis Center for Diabetes, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Janet M. Wenzlau
- Barbara Davis Center for Diabetes, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Bruno Annibale
- Medical-Surgical Department of Clinical Sciences and Translational Medicine, Sant'Andrea Hospital, University Sapienza, Rome, Italy
| |
Collapse
|
6
|
Shi X, Huang G, Wang Y, Liu Z, Deng C, Li X, Zheng P, Zhou Z. Tetraspanin 7 autoantibodies predict progressive decline of beta cell function in individuals with LADA. Diabetologia 2019; 62:399-407. [PMID: 30594957 DOI: 10.1007/s00125-018-4799-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2018] [Accepted: 11/27/2018] [Indexed: 12/26/2022]
Abstract
AIMS/HYPOTHESIS The aim of this work was to investigate whether tetraspanin 7 autoantibodies (TSPAN7A) are valuable in predicting poor beta cell function in individuals with latent autoimmune diabetes in adults (LADA). METHODS The cross-sectional study involved participants with LADA (n = 173), type 1 diabetes (n = 158), type 2 diabetes (n = 204) and healthy control participants (n = 170). The longitudinal study involved 53 participants with LADA, with a 3-year follow-up. In both cohorts, TSPAN7A in the sera were measured by a luciferase immunoprecipitation system assay, and physical and clinical characteristics were recorded. RESULTS The prevalence of TSPAN7A in LADA, type 1 diabetes, type 2 diabetes and healthy control participants was 21.4% (37/173), 26% (41/158), 0.5% (1/204) and 1.2% (2/170), respectively. Importantly, measurement of TSPAN7A significantly increased the number of individuals with LADA found to be positive for multiple antibodies (32.4% vs 22%; p < 0.001). Further logistic regression analysis demonstrated that positivity for TSPAN7A (OR 2.87, p = 0.034), disease duration (OR 1.83, p = 0.019) and GAD antibody titre (OR 2.67, p = 0.009) were risk factors for beta cell function in LADA, while BMI (OR 0.34, p = 0.001) was a protective factor. In the prospective study in individuals with LADA, the median annual decrease in rates of fasting C-peptide and 2 h postprandial C-peptide in individuals who were positive for TSPAN7A was significantly higher when compared with the decrease in those who were negative for TSPAN7A (34.6% vs 7.9%, p = 0.043 and 33.2% vs 11%, p = 0.041, respectively). CONCLUSIONS/INTERPRETATION TSPAN7A are valid islet autoantibodies for use in East Asian populations with autoimmune diabetes and can discriminate individuals with LADA who have lower beta cell function after disease progression.
Collapse
Affiliation(s)
- Xiajie Shi
- Department of Metabolism & Endocrinology, The Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, China
- Key Laboratory of Diabetes Immunology, Central South University, Ministry of Education, National Clinical Research Center for Metabolic Diseases, Changsha, Hunan, China
| | - Gan Huang
- Department of Metabolism & Endocrinology, The Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, China
- Key Laboratory of Diabetes Immunology, Central South University, Ministry of Education, National Clinical Research Center for Metabolic Diseases, Changsha, Hunan, China
| | - Yanfei Wang
- Department of Metabolism & Endocrinology, The Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, China
- Key Laboratory of Diabetes Immunology, Central South University, Ministry of Education, National Clinical Research Center for Metabolic Diseases, Changsha, Hunan, China
| | - Zhenqi Liu
- Division of Endocrinology and Metabolism, Department of Medicine, University of Virginia Health System, Charlottesville, VA, USA
| | - Chao Deng
- Department of Metabolism & Endocrinology, The Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, China
- Key Laboratory of Diabetes Immunology, Central South University, Ministry of Education, National Clinical Research Center for Metabolic Diseases, Changsha, Hunan, China
| | - Xia Li
- Department of Metabolism & Endocrinology, The Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, China
- Key Laboratory of Diabetes Immunology, Central South University, Ministry of Education, National Clinical Research Center for Metabolic Diseases, Changsha, Hunan, China
| | - Peilin Zheng
- Department of Metabolism & Endocrinology, The Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, China.
- Key Laboratory of Diabetes Immunology, Central South University, Ministry of Education, National Clinical Research Center for Metabolic Diseases, Changsha, Hunan, China.
| | - Zhiguang Zhou
- Department of Metabolism & Endocrinology, The Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, China.
- Key Laboratory of Diabetes Immunology, Central South University, Ministry of Education, National Clinical Research Center for Metabolic Diseases, Changsha, Hunan, China.
| |
Collapse
|
7
|
Lahner E, Marzinotto I, Brigatti C, Davidson H, Wenzlau J, Piemonti L, Annibale B, Lampasona V. Measurement of Autoantibodies to Gastric H+,K+-ATPase (ATP4A/B) Using a Luciferase Immunoprecipitation System (LIPS). Methods Mol Biol 2019; 1901:113-131. [PMID: 30539573 DOI: 10.1007/978-1-4939-8949-2_10] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The Luciferase Immuno Precipitation System (LIPS) enables the detection of specific serum antibodies by immunoprecipitation of recombinant antigens tagged with a luciferase reporter. Here we describe LIPS assays for the quantification of autoantibodies to the H+, K+-ATPase A (ATP4A) and B (ATP4B) subunits, two serological markers of autoimmune atrophic gastritis and pernicious anemia. In particular, we will describe the expression of luciferase-tagged recombinant ATP4A and ATP4B, their immunoprecipitation with test sera, the recovery and washing of immune-complexes with a protein-A coated resin, and the quantification of autoantibodies by addition of a luciferase substrate and the measurement of the light output from captured luciferase-tagged antigens.
Collapse
Affiliation(s)
- Edith Lahner
- Medical-Surgical Department of Clinical Sciences and Translational Medicine, Sant'Andrea Hospital, Sapienza University of Rome, Rome, Italy
| | - Ilaria Marzinotto
- Division of Genetics and Cell Biology, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Cristina Brigatti
- Beta Cell Biology Unit, Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Howard Davidson
- Barbara Davis Center for Diabetes, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Janet Wenzlau
- Barbara Davis Center for Diabetes, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Lorenzo Piemonti
- Beta Cell Biology Unit, Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Bruno Annibale
- Medical-Surgical Department of Clinical Sciences and Translational Medicine, Sant'Andrea Hospital, Sapienza University of Rome, Rome, Italy
| | - Vito Lampasona
- Division of Genetics and Cell Biology, IRCCS San Raffaele Scientific Institute, Milan, Italy.
| |
Collapse
|
8
|
Roberts MS, Burbelo PD, Egli-Spichtig D, Perwad F, Romero CJ, Ichikawa S, Farrow E, Econs MJ, Guthrie LC, Collins MT, Gafni RI. Autoimmune hyperphosphatemic tumoral calcinosis in a patient with FGF23 autoantibodies. J Clin Invest 2018; 128:5368-5373. [PMID: 30226830 DOI: 10.1172/jci122004] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 09/11/2018] [Indexed: 01/08/2023] Open
Abstract
Hyperphosphatemic familial tumoral calcinosis (HFTC)/hyperostosis-hyperphosphatemia syndrome (HHS) is an autosomal recessive disorder of ectopic calcification due to deficiency of or resistance to intact fibroblast growth factor 23 (iFGF23). Inactivating mutations in FGF23, N-acetylgalactosaminyltransferase 3 (GALNT3), or KLOTHO (KL) have been reported as causing HFTC/HHS. We present what we believe is the first identified case of autoimmune hyperphosphatemic tumoral calcinosis in an 8-year-old boy. In addition to the classical clinical and biochemical features of hyperphosphatemic tumoral calcinosis, the patient exhibited markedly elevated intact and C-terminal FGF23 levels, suggestive of FGF23 resistance. However, no mutations in FGF23, KL, or FGF receptor 1 (FGFR1) were identified. He subsequently developed type 1 diabetes mellitus, which raised the possibility of an autoimmune cause for hyperphosphatemic tumoral calcinosis. Luciferase immunoprecipitation systems revealed markedly elevated FGF23 autoantibodies without detectable FGFR1 or Klotho autoantibodies. Using an in vitro FGF23 functional assay, we found that the FGF23 autoantibodies in the patient's plasma blocked downstream signaling via the MAPK/ERK signaling pathway in a dose-dependent manner. Thus, this report describes the first case, to our knowledge, of autoimmune hyperphosphatemic tumoral calcinosis with pathogenic autoantibodies targeting FGF23. Identification of this pathophysiology extends the etiologic spectrum of hyperphosphatemic tumoral calcinosis and suggests that immunomodulatory therapy may be an effective treatment.
Collapse
Affiliation(s)
| | - Peter D Burbelo
- Dental Clinical Research Core, National Institute of Dental and Craniofacial Research (NIDCR), NIH, Bethesda, Maryland, USA
| | - Daniela Egli-Spichtig
- Department of Pediatrics, Division of Nephrology, UCSF School of Medicine, San Francisco, California, USA
| | - Farzana Perwad
- Department of Pediatrics, Division of Nephrology, UCSF School of Medicine, San Francisco, California, USA
| | - Christopher J Romero
- Department of Pediatric Endocrinology and Diabetes, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Shoji Ichikawa
- Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Emily Farrow
- Center for Pediatric Genomic Medicine, Children's Mercy Hospital, Kansas City, Missouri, USA
| | - Michael J Econs
- Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA.,Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | | | | | | |
Collapse
|
9
|
Ling Y, Jiang P, Li N, Yan Q, Wang X. A luciferase immunoprecipitation assay for the detection of proinsulin/insulin autoantibodies. Clin Biochem 2018; 54:51-55. [DOI: 10.1016/j.clinbiochem.2018.02.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 02/13/2018] [Accepted: 02/15/2018] [Indexed: 12/29/2022]
|
10
|
Liberati D, Wyatt RC, Brigatti C, Marzinotto I, Ferrari M, Bazzigaluppi E, Bosi E, Gillard BT, Gillespie KM, Gorus F, Weets I, Balti E, Piemonti L, Achenbach P, Williams AJK, Lampasona V. A novel LIPS assay for insulin autoantibodies. Acta Diabetol 2018; 55:263-270. [PMID: 29305766 DOI: 10.1007/s00592-017-1082-y] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2017] [Accepted: 11/20/2017] [Indexed: 12/26/2022]
Abstract
AIMS Insulin autoantibodies (IAA) are often the first marker of autoimmunity detected in children in the preclinical phase of type 1 diabetes (T1D). Currently, the vast majority of laboratories adopt the radiobinding micro-assay (RBA) for measuring IAA. Our aim was to replace RBA with a novel non-radioactive IAA Luciferase Immuno Precipitation System (LIPS) assay with improved performance. METHODS We developed (pro)insulin antigens with alternative placements of a NanoLuc™ luciferase reporter (NLuc). Performance in LIPS was evaluated by testing sera from new onset T1D (n = 80), blood donors (n = 123), schoolchildren (n = 186), first-degree relatives (FDRs) from the Bart's Oxford family study (n = 53) and from the Belgian Diabetes Registry (n = 136), coded sera from the Islet Autoantibody Standardization Program (IASP) (T1D n = 50, blood donors n = 90). RESULTS IAA LIPS based on B chain-NLuc proinsulin or B chain-NLuc insulin, in which NLuc was fused at the C-terminus of the insulin B chain, required only 2 μL of serum and a short incubation time, showed high concordance with RBA (Spearman r = 0.866 and 0.833, respectively), high assay performance (B chain-NLuc proinsulin ROC-AUC = 0.894 and B chain-NLuc insulin ROC-AUC = 0.916), and an adjusted sensitivity at 95% specificity ranking on par with the best assays submitted to the two most recent IASP workshops. In FDRs, the IAA LIPS showed improved discrimination of progressors to T1D compared to RBA. CONCLUSIONS We established a novel high-performance non-radioactive IAA LIPS that might replace the current gold standard RBA and find wide application in the study of the IAA response in T1D.
Collapse
Affiliation(s)
- Daniela Liberati
- Human Pathology Genomic Diagnostics Unit, Division of Genetics and Cell Biology, IRCCS San Raffaele Scientific Institute, Via Olgettina 60, 20132, Milan, Italy
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Rebecca C Wyatt
- Diabetes and Metabolism Unit, Translational Health Sciences, University of Bristol, Bristol, UK
| | - Cristina Brigatti
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Ilaria Marzinotto
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Maurizio Ferrari
- Human Pathology Genomic Diagnostics Unit, Division of Genetics and Cell Biology, IRCCS San Raffaele Scientific Institute, Via Olgettina 60, 20132, Milan, Italy
- Vita-Salute San Raffaele University, Milan, Italy
| | - Elena Bazzigaluppi
- Department of Laboratory Medicine, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Emanuele Bosi
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
- Vita-Salute San Raffaele University, Milan, Italy
| | - Ben T Gillard
- Diabetes and Metabolism Unit, Translational Health Sciences, University of Bristol, Bristol, UK
| | - Kathleen M Gillespie
- Diabetes and Metabolism Unit, Translational Health Sciences, University of Bristol, Bristol, UK
| | - Frans Gorus
- Diabetes Research Center, Vrije Universiteit Brussel, Brussels, Belgium
- Department of Clinical Chemistry, Universitair Ziekenhuis Brussel, Brussels, Belgium
| | - Ilse Weets
- Diabetes Research Center, Vrije Universiteit Brussel, Brussels, Belgium
- Department of Clinical Chemistry, Universitair Ziekenhuis Brussel, Brussels, Belgium
| | - Eric Balti
- Diabetes Research Center, Vrije Universiteit Brussel, Brussels, Belgium
- Department of Clinical Chemistry, Universitair Ziekenhuis Brussel, Brussels, Belgium
| | - Lorenzo Piemonti
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
- Vita-Salute San Raffaele University, Milan, Italy
| | - Peter Achenbach
- Institute of Diabetes Research, Helmholtz Zentrum München, and Forschergruppe Diabetes, Klinikum rechts der Isar, Technische Universität München, Neuherberg, Germany
| | - Alistair J K Williams
- Diabetes and Metabolism Unit, Translational Health Sciences, University of Bristol, Bristol, UK
| | - Vito Lampasona
- Human Pathology Genomic Diagnostics Unit, Division of Genetics and Cell Biology, IRCCS San Raffaele Scientific Institute, Via Olgettina 60, 20132, Milan, Italy.
| |
Collapse
|
11
|
Liberati D, Marzinotto I, Brigatti C, Dugnani E, Pasquale V, Reni M, Balzano G, Falconi M, Piemonti L, Lampasona V. No evidence of pancreatic ductal adenocarcinoma specific autoantibodies to Ezrin in a liquid phase LIPS immunoassay. Cancer Biomark 2018; 22:351-357. [PMID: 29660901 DOI: 10.3233/cbm-181218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Sensitive and specific biomarkers of Pancreatic Ductal Adenocarcinoma (PDAC) are desperately needed to allow early diagnosis and improve patient's survival. Ezrin autoantibodies were recently described as present in 93% of PDAC patients and 40% of healthy subjects who later developed PDAC. However, another prospective study failed to replicate these findings. Both studies were based on the use of a solid phase ELISA immunoassay. OBJECTIVE We aimed at re-evaluating the usefulness of Ezrin autoantibodies as PDAC biomarkers using the Luciferase Immuno Precipitation System (LIPS), an alternative immunoassay format that found successful application for the measurement of autoantibodies against pancreatic autoantigens. METHODS We produced a Nanoluciferase™ tagged Ezrin (NLuc-Ezrin). NLuc-Ezrin was then used as antigen in LIPS to test for Ezrin autoantibodies patients affected by PDAC (n= 40), other pancreatic diseases (OPD, n= 50), and healthy controls (n= 60). RESULTS Overall, binding in liquid phase to Ezrin by serum antibodies was rare and low titer. Furthermore, we did not find statistically significant differences in the prevalence of Ezrin autoantibodies between patients affected by either PDAC or OPD compared to control. CONCLUSIONS Our results do not confirm the usefulness of Ezrin autoAbs as biomarker of PDAC.
Collapse
Affiliation(s)
- Daniela Liberati
- Division of Genetics and Cell Biology, Genomic Unit for the Diagnosis of Human Pathologies, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
- Division of Genetics and Cell Biology, Genomic Unit for the Diagnosis of Human Pathologies, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
| | - Ilaria Marzinotto
- Division of Genetics and Cell Biology, Genomic Unit for the Diagnosis of Human Pathologies, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
- Division of Genetics and Cell Biology, Genomic Unit for the Diagnosis of Human Pathologies, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
| | - Cristina Brigatti
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
| | - Erica Dugnani
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
| | - Valentina Pasquale
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
| | - Michele Reni
- Department of Medical Oncology, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
| | - Gianpaolo Balzano
- Pancreatic Surgery Unit, Pancreas Translational and Clinical Research Center, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
- Vita-Salute San Raffaele University, Italy
| | - Massimo Falconi
- Pancreatic Surgery Unit, Pancreas Translational and Clinical Research Center, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
- Vita-Salute San Raffaele University, Italy
| | - Lorenzo Piemonti
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
- Vita-Salute San Raffaele University, Italy
| | - Vito Lampasona
- Division of Genetics and Cell Biology, Genomic Unit for the Diagnosis of Human Pathologies, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
| |
Collapse
|
12
|
Marzinotto I, Liberati D, Brigatti C, Bonfanti R, Stabilini A, Monti P, Bosi E, Piemonti L, Lampasona V. Autoantibody binding in liquid phase to IL-2 in human sera is not type 1 diabetes specific. Diabetologia 2017; 60:1834-1835. [PMID: 28725911 DOI: 10.1007/s00125-017-4376-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 06/13/2017] [Indexed: 11/25/2022]
Affiliation(s)
- Ilaria Marzinotto
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Daniela Liberati
- Division of Genetics and Cell Biology, IRCCS San Raffaele Scientific Institute, Via Olgettina 60, 20132, Milan, Italy
| | - Cristina Brigatti
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Riccardo Bonfanti
- Department of Pediatrics, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Angela Stabilini
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Paolo Monti
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Emanuele Bosi
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
- Vita-Salute University, Milan, Italy
| | - Lorenzo Piemonti
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
- Vita-Salute University, Milan, Italy
| | - Vito Lampasona
- Division of Genetics and Cell Biology, IRCCS San Raffaele Scientific Institute, Via Olgettina 60, 20132, Milan, Italy.
| |
Collapse
|
13
|
Lahner E, Brigatti C, Marzinotto I, Carabotti M, Scalese G, Davidson HW, Wenzlau JM, Bosi E, Piemonti L, Annibale B, Lampasona V. Luminescent Immunoprecipitation System (LIPS) for Detection of Autoantibodies Against ATP4A and ATP4B Subunits of Gastric Proton Pump H+,K+-ATPase in Atrophic Body Gastritis Patients. Clin Transl Gastroenterol 2017; 8:e215. [PMID: 28102858 PMCID: PMC5288605 DOI: 10.1038/ctg.2016.71] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Accepted: 12/07/2016] [Indexed: 02/08/2023] Open
Abstract
OBJECTIVES Circulating autoantibodies targeting the H+/K+-ATPase proton pump of gastric parietal cells are considered markers of autoimmune gastritis, whose diagnostic accuracy in atrophic body gastritis, the pathological lesion of autoimmune gastritis, remains unknown. This study aimed to assess autoantibodies against ATP4A and ATP4B subunits of parietal cells H+, K+-ATPase in atrophic body gastritis patients and controls. METHODS One-hundred and four cases with atrophic body gastritis and 205 controls were assessed for serological autoantibodies specific for ATP4A or ATP4B subunits using luminescent immunoprecipitation system (LIPS). Recombinant luciferase-reporter-fused-antigens were expressed by in vitro transcription-translation (ATP4A) or after transfection in Expi293F cells (ATP4B), incubated with test sera, and immune complexes recovered using protein-A-sepharose. LIPS assays were compared with a commercial enzyme immunoassay (EIA) for parietal cell autoantibodies. RESULTS ATP4A and ATP4B autoantibody titers were higher in cases compared to controls (P<0.0001). The area under the receiver-operating characteristic curve was 0.98 (95% CI 0.965-0.996) for ATP4A, and 0.99 (95% CI 0.979-1.000) for ATP4B, both higher as compared with that of EIA: 0.86 (95% CI 0.809-0.896), P<0.0001. Sensitivity-specificity were 100-89% for ATP4A and 100-90% for ATP4B assay. Compared with LIPS, EIA for parietal cell autoantibodies showed a lower sensitivity (72%, P<0.0001) at a similar specificity (92%, P=0.558). CONCLUSIONS Positivity to both, ATP4A and ATP4B autoantibodies is closely associated with atrophic body gastritis. Both assays had the highest sensitivity, at the cost of diagnostic accuracy (89 and 90% specificity), outperforming traditional EIA. Once validated, these LIPS assays should be valuable screening tools for detecting biomarkers of damaged atrophic oxyntic mucosa.
Collapse
Affiliation(s)
- Edith Lahner
- Clinical and Surgical Sciences and Translational Medicine, Sant'Andrea Hospital, School of Medicine, University Sapienza, Rome, Italy
| | - Cristina Brigatti
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Ilaria Marzinotto
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Marilia Carabotti
- Department of Internal Medicine and Medical Specialties, University Sapienza, Rome, Italy
| | - Giulia Scalese
- Clinical and Surgical Sciences and Translational Medicine, Sant'Andrea Hospital, School of Medicine, University Sapienza, Rome, Italy
| | - Howard W Davidson
- Barbara Davis Center for Diabetes, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Janet M Wenzlau
- Barbara Davis Center for Diabetes, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Emanuele Bosi
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Lorenzo Piemonti
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Bruno Annibale
- Clinical and Surgical Sciences and Translational Medicine, Sant'Andrea Hospital, School of Medicine, University Sapienza, Rome, Italy
- Clinical and Surgical Sciences and Translational Medicine, University Sapienza, Sant'Andrea Hospital, Via di Grottarossa 1035, Rome 00189, Italy. E-mail:
| | - Vito Lampasona
- Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy
- Department of Internal Medicine and Medical Specialties, University Sapienza, Rome, Italy
- Barbara Davis Center for Diabetes, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
- Divisione di Genetica e Biologia Cellulare, IRCCS San Raffaele Scientific Institute, Milan, Italy
- Divisione di Genetica e Biologia Cellulare & Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, via Olgettina 60, Milan 20132, Italy. E-mail:
| |
Collapse
|
14
|
Guerra LL, Faccinetti NI, Trabucchi A, Rovitto BD, Sabljic AV, Poskus E, Iacono RF, Valdez SN. Novel prokaryotic expression of thioredoxin-fused insulinoma associated protein tyrosine phosphatase 2 (IA-2), its characterization and immunodiagnostic application. BMC Biotechnol 2016; 16:84. [PMID: 27881117 PMCID: PMC5122161 DOI: 10.1186/s12896-016-0309-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Accepted: 10/21/2016] [Indexed: 11/11/2022] Open
Abstract
Background The insulinoma associated protein tyrosine phosphatase 2 (IA-2) is one of the immunodominant autoantigens involved in the autoimmune attack to the beta-cell in Type 1 Diabetes Mellitus. In this work we have developed a complete and original process for the production and recovery of the properly folded intracellular domain of IA-2 fused to thioredoxin (TrxIA-2ic) in Escherichia coli GI698 and GI724 strains. We have also carried out the biochemical and immunochemical characterization of TrxIA-2icand design variants of non-radiometric immunoassays for the efficient detection of IA-2 autoantibodies (IA-2A). Results The main findings can be summarized in the following statements: i) TrxIA-2ic expression after 3 h of induction on GI724 strain yielded ≈ 10 mg of highly pure TrxIA-2ic/L of culture medium by a single step purification by affinity chromatography, ii) the molecular weight of TrxIA-2ic (55,358 Da) could be estimated by SDS-PAGE, size exclusion chromatography and mass spectrometry, iii) TrxIA-2ic was properly identified by western blot and mass spectrometric analysis of proteolytic digestions (63.25 % total coverage), iv) excellent immunochemical behavior of properly folded full TrxIA-2ic was legitimized by inhibition or displacement of [35S]IA-2 binding from IA-2A present in Argentinian Type 1 Diabetic patients, v) great stability over time was found under proper storage conditions and vi) low cost and environmentally harmless ELISA methods for IA-2A assessment were developed, with colorimetric or chemiluminescent detection. Conclusions E. coli GI724 strain emerged as a handy source of recombinant IA-2ic, achieving high levels of expression as a thioredoxin fusion protein, adequately validated and applicable to the development of innovative and cost-effective immunoassays for IA-2A detection in most laboratories. Electronic supplementary material The online version of this article (doi:10.1186/s12896-016-0309-2) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Luciano Lucas Guerra
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Estudios de la Inmunidad Humoral "Prof. Ricardo A. Margni" (IDEHU), Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina
| | - Natalia Inés Faccinetti
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Estudios de la Inmunidad Humoral "Prof. Ricardo A. Margni" (IDEHU), Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina
| | - Aldana Trabucchi
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Estudios de la Inmunidad Humoral "Prof. Ricardo A. Margni" (IDEHU), Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina
| | - Bruno David Rovitto
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Estudios de la Inmunidad Humoral "Prof. Ricardo A. Margni" (IDEHU), Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina
| | - Adriana Victoria Sabljic
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Estudios de la Inmunidad Humoral "Prof. Ricardo A. Margni" (IDEHU), Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina
| | - Edgardo Poskus
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Estudios de la Inmunidad Humoral "Prof. Ricardo A. Margni" (IDEHU), Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina
| | - Ruben Francisco Iacono
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Estudios de la Inmunidad Humoral "Prof. Ricardo A. Margni" (IDEHU), Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina
| | - Silvina Noemí Valdez
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Estudios de la Inmunidad Humoral "Prof. Ricardo A. Margni" (IDEHU), Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina.
| |
Collapse
|
15
|
Ferre EM, Rose SR, Rosenzweig SD, Burbelo PD, Romito KR, Niemela JE, Rosen LB, Break TJ, Gu W, Hunsberger S, Browne SK, Hsu AP, Rampertaap S, Swamydas M, Collar AL, Kong HH, Lee CCR, Chascsa D, Simcox T, Pham A, Bondici A, Natarajan M, Monsale J, Kleiner DE, Quezado M, Alevizos I, Moutsopoulos NM, Yockey L, Frein C, Soldatos A, Calvo KR, Adjemian J, Similuk MN, Lang DM, Stone KD, Uzel G, Kopp JB, Bishop RJ, Holland SM, Olivier KN, Fleisher TA, Heller T, Winer KK, Lionakis MS. Redefined clinical features and diagnostic criteria in autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy. JCI Insight 2016; 1:e88782. [PMID: 27588307 PMCID: PMC5004733 DOI: 10.1172/jci.insight.88782] [Citation(s) in RCA: 165] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Accepted: 07/12/2016] [Indexed: 02/06/2023] Open
Abstract
Autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy (APECED) is a rare primary immunodeficiency disorder typically caused by homozygous AIRE mutations. It classically presents with chronic mucocutaneous candidiasis and autoimmunity that primarily targets endocrine tissues; hypoparathyroidism and adrenal insufficiency are most common. Developing any two of these classic triad manifestations establishes the diagnosis. Although widely recognized in Europe, where nonendocrine autoimmune manifestations are uncommon, APECED is less defined in patients from the Western Hemisphere. We enrolled 35 consecutive American APECED patients (33 from the US) in a prospective observational natural history study and systematically examined their genetic, clinical, autoantibody, and immunological characteristics. Most patients were compound heterozygous; the most common AIRE mutation was c.967_979del13. All but one patient had anti-IFN-ω autoantibodies, including 4 of 5 patients without biallelic AIRE mutations. Urticarial eruption, hepatitis, gastritis, intestinal dysfunction, pneumonitis, and Sjögren's-like syndrome, uncommon entities in European APECED cohorts, affected 40%-80% of American cases. Development of a classic diagnostic dyad was delayed at mean 7.38 years. Eighty percent of patients developed a median of 3 non-triad manifestations before a diagnostic dyad. Only 20% of patients had their first two manifestations among the classic triad. Urticarial eruption, intestinal dysfunction, and enamel hypoplasia were prominent among early manifestations. Patients exhibited expanded peripheral CD4+ T cells and CD21loCD38lo B lymphocytes. In summary, American APECED patients develop a diverse syndrome, with dramatic enrichment in organ-specific nonendocrine manifestations starting early in life, compared with European patients. Incorporation of these new manifestations into American diagnostic criteria would accelerate diagnosis by approximately 4 years and potentially prevent life-threatening endocrine complications.
Collapse
Affiliation(s)
- Elise M.N. Ferre
- Fungal Pathogenesis Unit, Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases (NIAID)
| | - Stacey R. Rose
- Fungal Pathogenesis Unit, Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases (NIAID)
| | | | - Peter D. Burbelo
- Dental Clinical Research Core, National Institute of Dental and Craniofacial Research, and
| | - Kimberly R. Romito
- Immunology Service, Department of Laboratory Medicine, NIH Clinical Center
| | - Julie E. Niemela
- Immunology Service, Department of Laboratory Medicine, NIH Clinical Center
| | - Lindsey B. Rosen
- Immunopathogenesis Section, Laboratory of Clinical Infectious Diseases, NIAID, NIH, Bethesda, Maryland, USA
| | - Timothy J. Break
- Fungal Pathogenesis Unit, Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases (NIAID)
| | - Wenjuan Gu
- Clinical Research Directorate/Clinical Monitoring Research Program, Leidos Biomedical Research, Inc., National Cancer Institute (NCI) Campus at Frederick, Frederick, Maryland, USA
| | - Sally Hunsberger
- Biostatistics Research Branch, Division of Clinical Research, NIAID
| | - Sarah K. Browne
- Immunopathogenesis Section, Laboratory of Clinical Infectious Diseases, NIAID, NIH, Bethesda, Maryland, USA
| | - Amy P. Hsu
- Immunopathogenesis Section, Laboratory of Clinical Infectious Diseases, NIAID, NIH, Bethesda, Maryland, USA
| | | | - Muthulekha Swamydas
- Fungal Pathogenesis Unit, Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases (NIAID)
| | - Amanda L. Collar
- Fungal Pathogenesis Unit, Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases (NIAID)
| | | | | | - David Chascsa
- Translational Hepatology Unit, Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases
| | - Thomas Simcox
- Translational Hepatology Unit, Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases
| | - Angela Pham
- Fungal Pathogenesis Unit, Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases (NIAID)
| | - Anamaria Bondici
- Fungal Pathogenesis Unit, Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases (NIAID)
| | - Mukil Natarajan
- Fungal Pathogenesis Unit, Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases (NIAID)
| | - Joseph Monsale
- Immunology Service, Department of Laboratory Medicine, NIH Clinical Center
| | | | | | - Ilias Alevizos
- Sjögren’s Syndrome and Salivary Gland Dysfunction Unit, and
| | - Niki M. Moutsopoulos
- Oral Immunity and Inflammation Unit, National Institute of Dental and Craniofacial Research, NIH, Bethesda, Maryland, USA
| | - Lynne Yockey
- Fungal Pathogenesis Unit, Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases (NIAID)
- Immunopathogenesis Section, Laboratory of Clinical Infectious Diseases, NIAID, NIH, Bethesda, Maryland, USA
| | - Cathleen Frein
- Clinical Research Directorate/Clinical Monitoring Research Program, Leidos Biomedical Research, Inc., National Cancer Institute (NCI) Campus at Frederick, Frederick, Maryland, USA
| | - Ariane Soldatos
- Undiagnosed Diseases Program, Common Fund, NIH Office of the Director and National Human Genome Research Institute, Bethesda, Maryland, USA
| | - Katherine R. Calvo
- Hematology Section, Department of Laboratory Medicine, NIH Clinical Center
| | | | | | | | | | - Gulbu Uzel
- Immunopathogenesis Section, Laboratory of Clinical Infectious Diseases, NIAID, NIH, Bethesda, Maryland, USA
| | - Jeffrey B. Kopp
- Kidney Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases
| | | | - Steven M. Holland
- Immunopathogenesis Section, Laboratory of Clinical Infectious Diseases, NIAID, NIH, Bethesda, Maryland, USA
| | - Kenneth N. Olivier
- Cardiovascular and Pulmonary Branch, National Heart, Lung, and Blood Institute, and
| | - Thomas A. Fleisher
- Immunology Service, Department of Laboratory Medicine, NIH Clinical Center
| | - Theo Heller
- Translational Hepatology Unit, Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases
| | - Karen K. Winer
- Pediatric Growth and Nutrition Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, Maryland, USA
| | - Michail S. Lionakis
- Fungal Pathogenesis Unit, Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases (NIAID)
| |
Collapse
|
16
|
Burbelo PD, Lebovitz EE, Notkins AL. Luciferase immunoprecipitation systems for measuring antibodies in autoimmune and infectious diseases. Transl Res 2015; 165:325-35. [PMID: 25241936 PMCID: PMC4306608 DOI: 10.1016/j.trsl.2014.08.006] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 08/26/2014] [Accepted: 08/26/2014] [Indexed: 12/22/2022]
Abstract
Antibody profiles have the potential to revolutionize personalized medicine by providing important information related to autoimmunity against self-proteins and exposure to infectious agents. One immunoassay technology, luciferase immunoprecipitation systems (LIPS), harnesses light-emitting recombinant proteins to generate robust, high-quality antibody data often spanning a large dynamic range of detection. Here, we describe the general format of LIPS and discuss studies using the technology to measure autoantibodies in several human autoimmune diseases including type 1 diabetes, Sjögren's syndrome, systemic lupus erythematosus, and immunodeficiencies secondary to anticytokine autoantibodies. We also describe the usefulness of evaluating antibodies against single or multiple antigens from infectious agents for diagnosis, pathogen discovery, and for obtaining individual exposure profiles. These diverse findings support the notion that the LIPS is a useful technology for generating antibody profiles for personalized diagnosis and monitoring of human health.
Collapse
Key Words
- ards, acute respiratory distress syndrome
- dntm, disseminated nontuberculous mycobacterial
- ebv, epstein-barr virus
- elisa, enzyme-linked immunoassay
- hcv, hepatitis c virus
- hiv, human immunodeficiency virus
- htlv, human t-lymphotropic virus
- il, interleukin
- kshv, kaposi sarcoma-associated herpes virus
- lips, luciferase immunoprecipitation systems
- mers, middle east respiratory virus
- nphv, nonprimate hepatitis c-like virus
- rip, radioimmunoprecipitation assay
- ruc, renilla luciferase
- sle, systemic lupus erythematosus
- ss, sjögren's syndrome
- t1d, type i diabetes
Collapse
Affiliation(s)
- Peter D Burbelo
- Dental Clinical Research Core, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD.
| | - Evan E Lebovitz
- Department of Perioperative Medicine, Clinical Center, National Institutes of Health, Bethesda, MD
| | - Abner L Notkins
- Experimental Medicine Section, Laboratory of Sensory Biology, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD
| |
Collapse
|
17
|
Ustinova J, Zusinaite E, Utt M, Metsküla K, Reimand K, Huchaiah V, Merits A, Uibo R. Development of a luciferase-based system for the detection of ZnT8 autoantibodies. J Immunol Methods 2014; 405:67-73. [DOI: 10.1016/j.jim.2014.01.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Revised: 12/19/2013] [Accepted: 01/14/2014] [Indexed: 01/10/2023]
|
18
|
Miersch S, Bian X, Wallstrom G, Sibani S, Logvinenko T, Wasserfall CH, Schatz D, Atkinson M, Qiu J, LaBaer J. Serological autoantibody profiling of type 1 diabetes by protein arrays. J Proteomics 2013; 94:486-96. [PMID: 24148850 DOI: 10.1016/j.jprot.2013.10.018] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Revised: 09/04/2013] [Accepted: 10/01/2013] [Indexed: 12/30/2022]
Abstract
The need for biomarkers that illuminate the pathophysiology of type 1 diabetes (T1D), enhance early diagnosis and provide additional avenues for therapeutic intervention is well recognized in the scientific community. We conducted a proteome-scale, two-stage serological AAb screening followed by an independent validation study. In the first stage, the immunoreactivity was compared between T1D cases and healthy controls against ~6000 human proteins using the nucleic acid programmable protein array (NAPPA). Genes identified with higher signal intensities in patients were challenged with a larger sample set during the second stage. Statistical analysis revealed 26 novel autoantigens and a known T1D-associated autoantigen. During validation, we verified the presence of AAbs to dual specificity tyrosine-phosphorylation-regulated kinase 2 (DYRK2) using the Luciferase ImmunoPrecipitation System (LIPS) assay (36% sensitivity, 98% specificity). The AUC for a combination of DYRK2A and the classical T1D AAb IA-2A was 0.90 compared to 0.72 for DYRK2A and 0.64 for IA-2A alone. This is the first systematic screening for seroreactivity against a large number of human proteins in T1D patients. We demonstrated the application of protein microarrays to identify novel autoantigens in T1D, expanded the current T1D "autoantigenome" and help fulfill the goal of searching for novel biomarker candidates for T1D. BIOLOGICAL SIGNIFICANCE Protein microarrays provide a high-throughput platform that enables the profiling of serum antibodies to a large number of protein antigens. The value of AAb biomarkers in diagnosis, prognosis and treatment is well recognized in autoimmune diseases including T1D. We performed a systematic screening for new T1D-associated autoantigens by adapting the innovative protein array platform NAPPA. We believe that the discovery in this study will add information on candidate autoantigens that could potentially improve the diagnosis and help uncover the pathophysiology of T1D. The successful use of NAPPA for T1D AAb profiling will open the window for larger studies including more human antigen genes and other autoimmune diseases.
Collapse
Affiliation(s)
- Shane Miersch
- Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada
| | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Lampasona V, Passerini L, Barzaghi F, Lombardoni C, Bazzigaluppi E, Brigatti C, Bacchetta R, Bosi E. Autoantibodies to harmonin and villin are diagnostic markers in children with IPEX syndrome. PLoS One 2013; 8:e78664. [PMID: 24250806 PMCID: PMC3826762 DOI: 10.1371/journal.pone.0078664] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Accepted: 09/13/2013] [Indexed: 12/30/2022] Open
Abstract
Autoantibodies to enterocyte antigens harmonin (75 kDa USH1C protein) and villin (actin-binding 95 kDa protein) are associated with the Immune dysregulation, Polyendocrinopathy, Enteropathy, X-linked (IPEX) syndrome. In this study we evaluated the diagnostic value of harmonin and villin autoantibodies in IPEX and IPEX-like syndromes. Harmonin and villin autoantibodies were measured by a novel Luminescent-Immuno-Precipitation-System (LIPS) quantitative assay, in patients with IPEX, IPEX-like syndrome, Primary Immunodeficiencies (PID) with enteropathy, all diagnosed by sequencing of the FOXP3 gene, and in type 1 diabetes (T1D), celiac disease and healthy blood donors as control groups. Harmonin and villin autoantibodies were detected in 12 (92%) and 6 (46%) of 13 IPEX patients, and in none of the IPEX-like, PID, T1D, celiac patients, respectively. All IPEX patients, including one case with late and atypical clinical presentation, had either harmonin and/or villin autoantibodies and tested positive for enterocyte antibodies by indirect immunofluorescence. When measured in IPEX patients in remission after immunosuppressive therapy or hematopoietic stem cell transplantation, harmonin and villin autoantibodies became undetectable or persisted at low titers in all cases but one in whom harmonin autoantibodies remained constantly high. In one patient, a peak of harmonin antibodies paralleled a relapse phase of enteropathy. Our study demonstrates that harmonin and villin autoantibodies, measured by LIPS, are sensitive and specific markers of IPEX, differentiate IPEX, including atypical cases, from other early childhood disorders associated with enteropathy, and are useful for screening and clinical monitoring of affected children.
Collapse
Affiliation(s)
- Vito Lampasona
- Center for Translational Genomics and Bioinformatics, San Raffaele Hospital Scientific Institute, Milan, Italy
| | - Laura Passerini
- Telethon Institute for Gene Therapy, Division of Regenerative Medicine, Stem Cells and Gene Therapy, San Raffaele Hospital Scientific Institute, Milan, Italy
| | - Federica Barzaghi
- Telethon Institute for Gene Therapy, Division of Regenerative Medicine, Stem Cells and Gene Therapy, San Raffaele Hospital Scientific Institute, Milan, Italy
| | - Carlo Lombardoni
- Center for Translational Genomics and Bioinformatics, San Raffaele Hospital Scientific Institute, Milan, Italy
- Diagnostica e Ricerca San Raffaele, Milan, Italy
| | | | - Cristina Brigatti
- Diabetes Research Institute, San Raffaele Hospital Scientific Institute, Milan, Italy
| | - Rosa Bacchetta
- Telethon Institute for Gene Therapy, Division of Regenerative Medicine, Stem Cells and Gene Therapy, San Raffaele Hospital Scientific Institute, Milan, Italy
- * E-mail: (EB); (RB)
| | - Emanuele Bosi
- Diagnostica e Ricerca San Raffaele, Milan, Italy
- Diabetes Research Institute, San Raffaele Hospital Scientific Institute, Milan, Italy
- Vita Salute San Raffaele University, Milan, Italy
- * E-mail: (EB); (RB)
| |
Collapse
|
20
|
Donelan W, Wang H, Li SW, Pittman D, Li Y, Han S, Sun Y, Carter C, Atkinson M, Reeves W, Winter WE, Yang LJ. Novel detection of pancreatic and duodenal homeobox 1 autoantibodies (PAA) in human sera using luciferase immunoprecipitation systems (LIPS) assay. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2013; 6:1202-1210. [PMID: 23696946 PMCID: PMC3657381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Received: 02/24/2013] [Accepted: 04/16/2013] [Indexed: 06/02/2023]
Abstract
We have previously identified pancreatic and duodenal homeobox 1 (Pdx1) autoantibodies (PAA) in sera from both non-obese diabetic (NOD) mice and human type 1 diabetic (T1D) patients. A suitable non-radioactive, sensitive and specific assay is needed for large-scale testing to determine the clinical utility of PAA. Here we reported a liquid-phase luciferase immunoprecipitation system (LIPS) assay by generating a renilla luciferase (Rluc)-Pdx1 fusion protein as a sensitive non-radioactive antigen from mammalian cells combined with immunoprecipitation to detect PAA in human sera. Sera from healthy donors and the University of Florida Pathology Laboratories, Endocrine Autoantibody Laboratory were used to validate the LIPS assay for PAA. Antigenic specificity to Pdx1 was confirmed by using a Rluc-only control compared to Rluc-Pdx1 fusion antigen and by competition assays using purified recombinant Pdx1 protein. We then used the LIPS assay to assess the prevalence of triple autoantibodies (GADA, IA-2A, and IA-2βA), and PAA in non-T1D control sera, recent onset (RO)-T1D sera (mean duration of T1D = 9.5 weeks), and long standing (LS)-T1D sera. Compared to clinical radioimmunoprecipitation assays (RIPA), the LIPS assay showed comparable sensitivity and specificity for detection of GADA and IA-2A. PAA were detectable in human serum samples and higher in triple-positive T1D autoantibodies (21% PAA positive in triple positive sera and 4% PAA positive in triple negative sera). Interestingly, PAA were found to be highest in the non-T1D population, suggesting that PAA might have a clinical utility in screening high-risk population susceptible for developing T1D. In conclusion, we have developed a liquid-phase, non-radioactive, sensitive and specific LIPS assay to detect PAA in human sera, providing a useful tool for evaluating the clinical relevance of PAA.
Collapse
Affiliation(s)
- William Donelan
- Department of Pathology, Immunology and Laboratory MedicineGainesville, Florida 32610, USA
| | - Hai Wang
- Department of Pathology, Immunology and Laboratory MedicineGainesville, Florida 32610, USA
| | - Shi-Wu Li
- Department of Pathology, Immunology and Laboratory MedicineGainesville, Florida 32610, USA
| | - David Pittman
- Department of Pathology, Immunology and Laboratory MedicineGainesville, Florida 32610, USA
| | - Yi Li
- Department of Medicine, University of Florida College of MedicineGainesville, Florida 32610, USA
| | - Shuhong Han
- Department of Medicine, University of Florida College of MedicineGainesville, Florida 32610, USA
| | - Yu Sun
- Department of Pathology, Immunology and Laboratory MedicineGainesville, Florida 32610, USA
| | - Christopher Carter
- Department of Pathology, Immunology and Laboratory MedicineGainesville, Florida 32610, USA
| | - Mark Atkinson
- Department of Pathology, Immunology and Laboratory MedicineGainesville, Florida 32610, USA
| | - Westley Reeves
- Department of Medicine, University of Florida College of MedicineGainesville, Florida 32610, USA
| | - William E Winter
- Department of Pathology, Immunology and Laboratory MedicineGainesville, Florida 32610, USA
| | - Li-Jun Yang
- Department of Pathology, Immunology and Laboratory MedicineGainesville, Florida 32610, USA
- Tianjin University of Science & TechnologyTianjin, 300457, China
| |
Collapse
|
21
|
Abstract
Type I diabetes (T1D) is an autoimmune disease characterized by destruction of insulin-producing β-cells in the pancreas. Although several islet cell autoantigens are known, the breadth and spectrum of autoantibody targets has not been fully explored. Here the luciferase immunoprecipitation systems (LIPS) antibody profiling technology was used to study islet and other organ-specific autoantibody responses in parallel. Examination of an initial cohort of 93 controls and 50 T1D subjects revealed that 16% of the diabetic subjects showed anti-gastric ATPase autoantibodies which did not correlate with autoantibodies against GAD65, IA2, or IA2-β. A more detailed study of a second cohort with 18 potential autoantibody targets revealed marked heterogeneity in autoantibody responses against islet cell autoantigens including two polymorphic variants of ZnT8. A subset of T1D subjects exhibited autoantibodies against several organ-specific targets including gastric ATPase (11%), thyroid peroxidase (14%), and anti-IgA autoantibodies against tissue transglutaminase (12%). Although a few T1D subjects showed autoantibodies against a lung-associated protein KCNRG (6%) and S100-β (8%), no statistically significant autoantibodies were detected against several cytokines. Analysis of the overall autoantibody profiles using a heatmap revealed two major subgroups of approximately similar numbers, consisting of T1D subjects with and without organ-specific autoantibodies. Within the organ-specific subgroup, there was minimal overlap among anti-gastric ATPase, anti-thyroid peroxidase, and anti-transglutaminase seropositivity, and these autoantibodies did not correlate with islet cell autoantibodies. Examination of a third cohort, comprising prospectively collected longitudinal samples from high-risk individuals, revealed that anti-gastric ATPase autoantibodies were present in several individuals prior to detection of islet autoantibodies and before clinical onset of T1D. Taken together, these results suggest that autoantibody portraits derived from islet and organ-specific targets will likely be useful for enhancing the clinical management of T1D.
Collapse
|
22
|
Marcus P, Yan X, Bartley B, Hagopian W. LIPS islet autoantibody assays in high-throughput format for DASP 2010. Diabetes Metab Res Rev 2011; 27:891-4. [PMID: 22069280 DOI: 10.1002/dmrr.1268] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND For cost-effective population-based diabetes prediction and confirmation, islet autoantibody assays must be made more economical. METHODS We evaluated glutamic acid decarboxylase (GAD)-Ruc (renilla luciferase) and IA2ic (also known as ICA512ic)-Ruc (renilla luciferase) fusion protein constructs in high-throughput islet antibody assay formats. RESULTS Antigen production via transfection onto COS cells in 100 mm culture dishes yielded sufficient antigen to assay 375 and 535 serum samples for GAD and IA2ic per dish, respectively. Antigen was usably stable after -80 °C storage for 40-80 days after which luciferase activity decreased. The mean signal-to-noise ratios for luciferase-based immunoprecitation system (LIPS) GAD and LIPS IA2ic were 88±24 and 219±89, respectively, comparing favourably to radio-binding assays (RBA) in the same format. However, the coefficient of variation among triplicate wells was higher for IA2ic than for GAD in LIPS, similar to findings in RBA format. Correlation coefficients between autoantibody indices determined from the RBA and LIPS methods were only R2=0.79 and R2=0.75 for GAD and IA2ic, respectively, raising the possibility that different epitopes were favoured in the two different assay formats. Nevertheless, overall concordance for the two assay types was high, at 228/240=95.0% for GAD and 494/521=94.8% for IA2ic. Using optimal cutoffs, Diabetes Autoantibody Standardization Program (DASP) 2010 sensitivity/specificity was 80/99% for GAD RBA, 80/99% for GAD LIPS, 70/98% for IA2 RBA, and 72/99% for IA2 LIPS. CONCLUSION The LIPS assays for islet autoantibodies to GAD and IA2ic performed as well as RBA in DASP 2010. With further refinements in expression and storage, these assays may be more economical than current methods to measure islet autoantibodies in type 1 diabetes.
Collapse
Affiliation(s)
- Patrick Marcus
- Pacific Northwest Diabetes Research Institute, Seattle, WA 98122, USA
| | | | | | | |
Collapse
|
23
|
Burbelo PD, Ching KH, Bren KE, Iadarola MJ. Searching for biomarkers: humoral response profiling with luciferase immunoprecipitation systems. Expert Rev Proteomics 2011; 8:309-16. [PMID: 21679112 DOI: 10.1586/epr.11.23] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
B-cell-mediated humoral responses are triggered in many human diseases, including autoimmune diseases, cancer, and neurologic and infectious diseases. However, the full exploitation of the information contained within a patient's antibody repertoire for diagnosis, monitoring and even disease prediction has been limited due to the poor diagnostic performance of many immunoassay formats. We have developed luciferase immunoprecipitation systems (LIPS) that harnesses light-emitting proteins to generate high-definition antibody profiles that are optimal for both diagnostics and biomarker discovery. Here, we describe the results and implications from a range of LIPS-antibody profiling studies performed in our laboratory. These include highly sensitive diagnostics for domestic and global pathogens, insights into infection-related diseases, discovery of new biomarkers for human diseases, subcategorization of symptoms and identification of pathogenic autoantibodies against self-proteins. These investigations highlight the types of humoral response profiles associated with different diseases, provide new information related to disease pathogenesis and offer a framework for incorporating LIPS antibody profiling into global health initiatives and disease monitoring.
Collapse
Affiliation(s)
- Peter D Burbelo
- Neurobiology and Pain Therapeutics Section, Laboratory of Sensory Biology, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA
| | | | | | | |
Collapse
|
24
|
Burbelo PD, Hirai H, Issa AT, Kingman A, Lernmark A, Ivarsson SA, Notkins AL, Iadarola MJ. Comparison of radioimmunoprecipitation with luciferase immunoprecipitation for autoantibodies to GAD65 and IA-2beta. Diabetes Care 2010; 33:754-6. [PMID: 20086252 PMCID: PMC2845022 DOI: 10.2337/dc09-1938] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To compare the sensitivity and specificity of luciferase immunoprecipitation (LIPS) with radioimmunoprecipitation (RIP) for the measurement of autoantibodies to the type 1 diabetes autoantigens glutamic acid decarboxylase 65 (GAD65) and insulinoma-associated protein (IA)-2beta. RESEARCH DESIGN AND METHODS Sera from 49 type 1 diabetic patients and 100 nondiabetic control subjects from Diabetes Antibody Standardization Program 2007 were used to screen for autoantibodies to GAD65. An additional 200 type 1 diabetic patients and 200 nondiabetic control subjects were used to validate the GAD65 results and screen for autoantibodies to IA-2beta. RESULTS LIPS showed equal sensitivity and specificity to RIP for detecting autoantibodies to GAD65 and IA-2beta. Receiver-operating characteristic analysis revealed that the detection of autoantibodies to GAD65 and IA-2beta by LIPS and RIP were not statistically different. CONCLUSIONS The LIPS assay does not require the use of radioisotopes or in vitro transcription/translation and is a practical alternative at the clinical level for the RIP assay.
Collapse
Affiliation(s)
- Peter D Burbelo
- Neurobiology and Pain Therapeutics Section, Laboratory of Sensory Biology, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland, USA
| | | | | | | | | | | | | | | |
Collapse
|
25
|
Burbelo PD, Ching KH, Han BL, Bush ER, Reeves WH, Iadarola MJ. Extraordinary antigenicity of the human Ro52 autoantigen. Am J Transl Res 2010; 2:145-155. [PMID: 20407604 PMCID: PMC2855627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Accepted: 03/12/2010] [Indexed: 05/29/2023]
Abstract
Autoantibody levels to the SSA complex, composed of Ro52 and Ro60 proteins, are commonly measured in the diagnoses of Sjögren's Syndrome (SjS), as well as other rheumatological diseases. One of these proteins, Ro52, is an interferon-inducible member of the tripartite motif family bearing a RING motif functioning as an E3 ligase that ubiquitinates interferon regulatory factor 8 and other proteins. Using Luciferase Immunoprecipitation Systems (LIPS) we explored the antigenicity of Ro52 in detail. Analysis of antibody responses against Ro52 and 20 other established antigens revealed that Ro52 had the highest antibody titers and most likely represents one of the most immunogenic human proteins. While the antibody titers in many of the SjS patients were significantly and substantially higher than the controls, all healthy individuals had anti-Ro52 autoantibodies. N- and C-terminal fragments of Ro52 showed immunoreactivity in these serum samples, but the sums of these antibody titers were significantly lower than the antibody titers directed against the full-length Ro52. Antibody profiling of controls and SjS patients with three different N-terminal fragments of Ro52 revealed that the coiled-coil region was the most useful diagnostic (66% sensitivity), followed by the B-box (31% sensitivity), and then the RING-finger (24% sensitivity). The C-terminal region of Ro52, containing the B30.2 domain, showed higher antibody titers in SjS patients compared to controls and this region was responsible for the high level of Ro52 immunoreactivity in healthy individuals. Analysis of immunoreactivity to TRIM5, a Ro52-related protein, and the B30.2 domain from BTN1 and pyrin, failed to show significant antibody titers with the control or SjS patient serum. These results highlight the unusually high level of Ro52 antigenicity and demonstrate that autoantibodies are directed at both linear and conformational epitopes spanning the entire molecule.
Collapse
|
26
|
High levels of Anti-GAD65 and Anti-Ro52 autoantibodies in a patient with major depressive disorder showing psychomotor disturbance. J Neuroimmunol 2010; 222:87-9. [PMID: 20227114 DOI: 10.1016/j.jneuroim.2010.02.015] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2009] [Revised: 02/17/2010] [Accepted: 02/17/2010] [Indexed: 11/20/2022]
Abstract
Autoimmune disease and/or autoantibodies have been reported in mood disorder patients. We screened for autoantibodies to glutamic acid decarboxylase (GAD65), thyroid peroxidase (TPO), gastric H+/K+ ATPase (ATP4B), and Ro52 in a psychiatric patient cohort. A 24-year-old woman with major depressive disorder (MDD) with reduced psychomotor activity was identified with unusually high serum GAD65 and Ro52 autoantibody titers. Anti-GAD65 and anti-Ro52 autoantibodies were also elevated in the CSF from this patient. Longitudinal examination revealed a four-fold increase in anti-GAD65 serum antibody titers which correlated with exacerbation of psychomotor symptomatology. These results suggest the possibility that CNS autoimmunity may be responsible for the psychomotor impairment in this MDD patient.
Collapse
|
27
|
Burbelo PD, Ching KH, Klimavicz CM, Iadarola MJ. Antibody profiling by Luciferase Immunoprecipitation Systems (LIPS). J Vis Exp 2009:1549. [PMID: 19812534 DOI: 10.3791/1549] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Technologies for comprehensively understanding and quantifying antibody profiles to autoantigens and infectious agents may yield new insights into disease mechanisms and may elucidate new markers to substratify disease with different clinical features and better understand pathogenesis. We have developed a highly quantitative method called Luciferase Immunoprecipitation Systems (LIPS) for profiling patient sera antibody responses to autoantigens and pathogen antigens associated with infection. Unlike ELISAs, the highly sensitive LIPS is easily implemented to survey humoral serological response profiles to different antigens in a universal format and produces dynamic antibody titer ranges up to 6 log(10) for some antigens. In these studies, quantitative profiling by LIPS of patient humoral responses against panels of antigens or even the entire proteome of some pathogens (i.e. HIV), is typically more informative than testing a single antigen by ELISA. In addition, LIPS also eliminates time and effort needed to produce highly purified antigens as well as the labor-intensive assay optimization steps needed for standard ELISAs. Here we provide a detailed protocol describing the technical aspects of performing LIPS assays for readily profiling antibody responses to single or multiple antigens.
Collapse
Affiliation(s)
- Peter D Burbelo
- Neurobiology and Pain Therapeutics Section, National Institute of Dental and Craniofacial Research, National Institutes of Health.
| | | | | | | |
Collapse
|
28
|
Burbelo PD, Ching KH, Issa AT, Loftus CM, Li Y, Satoh M, Reeves WH, Iadarola MJ. Rapid serological detection of autoantibodies associated with Sjögren's syndrome. J Transl Med 2009; 7:83. [PMID: 19778440 PMCID: PMC2760511 DOI: 10.1186/1479-5876-7-83] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2009] [Accepted: 09/24/2009] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Sjögren's syndrome (SjS) is a relatively common autoimmune disease characterized by oral and ocular dryness. There is an increasing need for simple, sensitive and rapid technologies for the diagnosis of SjS and other autoimmune diseases. Here we investigated whether a quick version of luciferase immunoprecipitation systems (QLIPS) could be used to produce a rapid, specific and quantitative test to detect autoantibodies associated with SjS. METHODS Using QLIPS, which requires only ten minutes of incubation, a cohort of control and SjS sera were tested for antibodies to three SjS autoantigens (La, Ro60 and Ro52). Sensitivity and specificity of the QLIPS tests were compared with LIPS and existing ELISA data. The QLIPS test for Ro52 was then evaluated with a new validation cohort and its diagnostic performance determined. RESULTS Using QLIPS, autoantibodies to three SjS antigens, La, Ro60, and Ro52 were detected in 49%, 56% and 70%, respectively, of the SjS patients and none of the controls (100% specificity). With antibody titers in the Ro52-seropositive SjS samples approximately 1,000 times higher than the healthy controls, not only was Ro52 the most informative, but detection of anti-Ro52 antibodies under these non-equilibrium conditions was improved compared to the standard 2 hour LIPS format. Validation of the anti-Ro52 QLIPS test in a new, independent cohort of SjS and control serum samples showed 66% sensitivity and 100% specificity. CONCLUSION Together these results suggest that the QLIPS format for Ro52 yields both a more rapid and more discriminating test for detecting Ro52 autoantibodies than existing immunoassays and has the potential to be adapted for point-of-care evaluation of patients with SjS and other rheumatologic diseases.
Collapse
Affiliation(s)
- Peter D Burbelo
- Neurobiology and Pain Therapeutics Section, Laboratory of Sensory Biology, National Institute of Craniofacial Research, National Institutes of Health, Bethesda, Maryland, USA
- Division of Rheumatology and Clinical Immunology and Center for Autoimmune Diseases, University of Florida, Gainesville, Florida, USA
| | - Kathryn H Ching
- Neurobiology and Pain Therapeutics Section, Laboratory of Sensory Biology, National Institute of Craniofacial Research, National Institutes of Health, Bethesda, Maryland, USA
- Division of Rheumatology and Clinical Immunology and Center for Autoimmune Diseases, University of Florida, Gainesville, Florida, USA
| | - Alexandra T Issa
- Neurobiology and Pain Therapeutics Section, Laboratory of Sensory Biology, National Institute of Craniofacial Research, National Institutes of Health, Bethesda, Maryland, USA
- Division of Rheumatology and Clinical Immunology and Center for Autoimmune Diseases, University of Florida, Gainesville, Florida, USA
| | - Caroline M Loftus
- Neurobiology and Pain Therapeutics Section, Laboratory of Sensory Biology, National Institute of Craniofacial Research, National Institutes of Health, Bethesda, Maryland, USA
- Division of Rheumatology and Clinical Immunology and Center for Autoimmune Diseases, University of Florida, Gainesville, Florida, USA
| | - Yi Li
- Neurobiology and Pain Therapeutics Section, Laboratory of Sensory Biology, National Institute of Craniofacial Research, National Institutes of Health, Bethesda, Maryland, USA
- Division of Rheumatology and Clinical Immunology and Center for Autoimmune Diseases, University of Florida, Gainesville, Florida, USA
| | - Minoru Satoh
- Neurobiology and Pain Therapeutics Section, Laboratory of Sensory Biology, National Institute of Craniofacial Research, National Institutes of Health, Bethesda, Maryland, USA
- Division of Rheumatology and Clinical Immunology and Center for Autoimmune Diseases, University of Florida, Gainesville, Florida, USA
| | - Westley H Reeves
- Neurobiology and Pain Therapeutics Section, Laboratory of Sensory Biology, National Institute of Craniofacial Research, National Institutes of Health, Bethesda, Maryland, USA
- Division of Rheumatology and Clinical Immunology and Center for Autoimmune Diseases, University of Florida, Gainesville, Florida, USA
| | - Michael J Iadarola
- Neurobiology and Pain Therapeutics Section, Laboratory of Sensory Biology, National Institute of Craniofacial Research, National Institutes of Health, Bethesda, Maryland, USA
- Division of Rheumatology and Clinical Immunology and Center for Autoimmune Diseases, University of Florida, Gainesville, Florida, USA
| |
Collapse
|
29
|
Burbelo PD, Leahy HP, Issa AT, Groot S, Baraniuk JN, Nikolov NP, Illei GG, Iadarola MJ. Sensitive and robust luminescent profiling of anti-La and other autoantibodies in Sjogren's syndrome. Autoimmunity 2009; 42:515-24. [PMID: 19657778 PMCID: PMC3417760 DOI: 10.1080/08916930902911738] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Sjogren's syndrome (SjS) patients often have a variety of extraglandular manifestations including neurological and gastrointestinal involvement. In this study we evaluated the diagnostic performance of luciferase immunoprecipitation system (LIPS) that employs mammalian cell-produced recombinant antigens for analyzing SjS autoantibody responses. LIPS testing of mammalian cell-produced La, Ro60 and Ro52 recombinant antigens with defined commercial antibodies demonstrated highly specific immunoprecitation of each antigen without cross-reactivity. Next, sera from 57 SjS and 25 volunteers were evaluated by LIPS against a panel of human autoantigens. LIPS detected robust anti-La antibody levels in 43/57 SjS patients (75% sensitivity) and markedly outperformed an ELISA (46% sensitivity). Profiling of other SjS-associated autoantigens revealed the presence of anti-Ro60, anti-Ro52 in 63% and 61%, of SjS patients, respectively. Interestingly, a C-terminal fragment of Ro52 (Ro52-Delta2), a protein fragment not previously found to be antigenic by ELISA, also showed positive immunoreactivity in 42/57 SjS patients (65% sensitivity). Additional profiling of other autoantigens revealed that certain SjS patients also showed positive immunoreactivity with thyroid peroxidase (14%), AQP-4 (12%) and the H(+)/K(+) gastric ATPase (16%) suggesting potential autoantibody attack of thyroid, neuronal and gastric parietal cells, respectively. These heterogeneous autoantibody responses detected by LIPS in SjS will likely be useful for diagnosis and for evaluating extraglandular manifestations.
Collapse
Affiliation(s)
- Peter D Burbelo
- Neurobiology and Pain Therapeutics Section, Laboratory of Sensory Biology, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD, USA.
| | | | | | | | | | | | | | | |
Collapse
|
30
|
Burbelo PD, Issa AT, Ching KH, Exner M, Drew WL, Alter HJ, Iadarola MJ. Highly quantitative serological detection of anti-cytomegalovirus (CMV) antibodies. Virol J 2009; 6:45. [PMID: 19409090 PMCID: PMC2683803 DOI: 10.1186/1743-422x-6-45] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2009] [Accepted: 05/01/2009] [Indexed: 11/12/2022] Open
Abstract
Background Human cytomegalovirus infection is associated with a variety of pathological conditions including retinitis, pneumonia, hepatitis and encephalitis that may be transmitted congenitally, horizontally and parenterally and occurs both as a primary infection and as reactivation in immunocompromised individuals. Currently, there is a need for improved quantitative serological tests to document seropositivity with high sensitivity and specificity. Methods Here we investigated whether luciferase immunoprecipitation systems (LIPS) would provide a more quantitative and sensitive method for detecting anti-CMV antibodies. Four protein fragments of immunodominant regions of CMV antigens pp150 and pp65 were generated as Renilla luciferase (Ruc) fusion proteins and used in LIPS with two cohorts of CMV positive and negative sera samples previously tested by ELISA. Results Analysis of the antibody responses to two of these antigen fragments, pp150-d1 and pp150-d2, revealed geometric mean antibody titers in the first cohort that were 100–1000 fold higher in the CMV positive sera compared to the CMV negative samples (p < 0.0001) and infection status exactly matched the ELISA results for the 46 samples of the first cohort (100% sensitivity and 100% specificity). Two additional antigen fragments, pp65-d1 and pp65-d2 also showed robust antibody titers in some CMV-infected sera and yielded 50% and 96% sensitivity, respectively. Analysis of a second cohort of 70 samples using a mixture of the 4 antigens, which simplifies data collection and analysis, yielded values which correlated well with the sum of the values from the 4 separate tests (rs = 0.93, p < 0.00001). While comparison of the LIPS results from this second cohort with ELISA showed 100% sensitivity, LIPS detected six additional CMV positive samples that were not detected by ELISA. Heat map analysis revealed that several of the LIPS positive/ELISA negative samples had positive LIPS immunoreactivity with 3–4 of the CMV antigens. Conclusion These results suggest that LIPS provides a highly robust and quantitative method for studying anti-CMV antibodies and has the potential to more accurately document CMV infection than standard ELISA.
Collapse
Affiliation(s)
- Peter D Burbelo
- Neurobiology and Pain Therapeutics Section, Laboratory of Sensory Biology, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892, USA.
| | | | | | | | | | | | | |
Collapse
|
31
|
Four-antigen mixture containing v-cyclin for serological screening of human herpesvirus 8 infection. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2009; 16:621-7. [PMID: 19261774 DOI: 10.1128/cvi.00474-08] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Improved diagnostic reagents and testing are currently needed for the serological detection of human herpesvirus 8 (HHV-8) infections. We evaluated the luciferase immunoprecipitation systems (LIPS) for profiling antibody responses to a panel of HHV-8 proteins for diagnosis of Kaposi sarcoma (KS)-infected individuals. Using a pilot serum set, LIPS detected robust antibody responses to several known antigens, and a screen of 14 additional HHV-8 proteins identified v-cyclin as a potentially new diagnostic antigen. In evaluating a training-serum set, a four-antigen panel (K8.1, v-cyclin, ORF65, and a LANA fragment) was found to provide sufficient information for diagnosis. Analysis of a validation serum set using the combined results from these four separate antigen tests showed 100% sensitivity and 100% specificity. Furthermore, a LIPS format using a mixture of the four antigens, which simplifies data collection and analysis, closely matched the diagnostic performance of the combined separate tests (R = 0.95). This four-antigen mixture format analyzed with the validation serum set also showed 100% sensitivity and 100% specificity but was not statistically different from two separate enzyme-linked immunosorbent assays (94% sensitivity and 100% specificity) using baculovirus-produced LANA and bacterially produced K8.1. Heat map analysis of KS patient antibody titers revealed marked heterogeneity in humoral responses to this four-antigen panel. Overall, the LIPS assay showed 97% sensitivity, and positive anti-v-cyclin antibodies were detected in approximately 75% of the KS sera. These results suggest that LIPS screening using an antigen mixture is a sensitive and high-throughput method for serological screening of HHV-8 infection in individuals with KS.
Collapse
|
32
|
Current literature in diabetes. Diabetes Metab Res Rev 2009; 25:i-x. [PMID: 19219862 DOI: 10.1002/dmrr.918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
33
|
Serological diagnosis of human herpes simplex virus type 1 and 2 infections by luciferase immunoprecipitation system assay. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2009; 16:366-71. [PMID: 19129469 DOI: 10.1128/cvi.00350-08] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Highly quantitative and high-throughput serological tests for evaluation of humoral responses to herpes simplex virus 1 (HSV-1) and HSV-2 are not available. The efficacy of luciferase immunoprecipitation system (LIPS) assays for antibody profiling and serologic diagnosis of HSV-1 and HSV-2 infection was investigated using a panel of five recombinant HSV antigens. Plasma samples from subjects seropositive for HSV-1 and/or HSV-2 or seronegative for HSV-1 and HSV-2 that had previously been analyzed by Western blotting and the Focus Plexus immunoassay were evaluated. The LIPS test measuring anti-gG1 antibody titers was 96% sensitive and 96% specific for detecting HSV-1 infection, compared with the Focus immunoassay, and was 92% sensitive and 96% specific, compared with Western blotting. The results for the anti-gG2 LIPS test for HSV-2 precisely matched those for Western blotting, with 100% sensitivity and 100% specificity, and showed robust antibody titers in all the HSV-2-infected samples that were over 1,000 times higher than those in HSV-2-negative or HSV-1-positive samples. Antibodies to three additional HSV-2 proteins, gB, gD, and ICP8, were detected in many of the HSV-1- and/or HSV-2-infected plasma samples and showed preferentially higher immunoreactivity in HSV-2-infected plasma. The titers of antibodies to these three HSV-2 antigens also significantly correlated with each other (R=0.75 to 0.81; P<0.0001). These studies indicate that the robust anti-gG1 and anti-gG2 antibody responses detected by LIPS assays are useful for HSV-1 and HSV-2 detection and suggest that profiling of antibody responses to a panel of HSV proteins may be useful for characterizing individual humoral responses to infection and for monitoring responses to vaccines.
Collapse
|