scholarly journals Biosensor analysis of anti-citrullinated protein/peptide antibody affinity

2014 ◽  
Vol 465 ◽  
pp. 96-101 ◽  
Author(s):  
Giada Rossi ◽  
Feliciana Real-Fernández ◽  
Filomena Panza ◽  
Francesca Barbetti ◽  
Federico Pratesi ◽  
...  
Keyword(s):  
Antibody Affinity ◽  
Peptide Antibody ◽  
Biosensor Analysis ◽  
Citrullinated Protein

Do all anti-citrullinated protein/peptide antibody tests measure the same? Evaluation of discrepancy between anti-citrullinated protein/peptide antibody tests in patients with and without rheumatoid arthritis

2007 ◽  
Vol 67 (4) ◽  
pp. 542-546 ◽  
Author(s):  
B Vander Cruyssen ◽  
L Nogueira ◽  
J Van Praet ◽  
D Deforce ◽  
D Elewaut ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Systemic Lupus Erythematosus ◽  
Psoriatic Arthritis ◽  
Lupus Erythematosus ◽  
Systemic Lupus ◽  
Human Fibrinogen ◽  
Peptide Antibody ◽  
Test Variability ◽  
Antibody Tests ◽  
Citrullinated Protein

Background:Different methods exist to demonstrate anti-citrullinated protein/peptide antibodies (ACPA).Aims:To evaluate discrepancy between four ACPA tests.Patients and methods:Population 1 consisted of patients with a new diagnostic problem, including 86 patients with rheumatoid arthritis (RA) and 450 patients without RA. Population 2 consisted of 155 patients with RA who had long-standing disease. Population 3 consisted of 188 patients with psoriatic arthritis and in population 4 there were 192 patients with systemic lupus erythematosus. Populations 1 and 2 were tested with the anti-human fibrinogen antibody (AhfibA) test, anti-CCP2 from Eurodiagnostica (CCP2-euro), anti-CCP2 from Pharmacia (CCP2-phar) and anti-CCP3 test by Inova (CCP3). Samples were annotated as discrepant if positive in one and negative in at least one other test. Each discrepant sample was re-analysed in a different run. Populations 3 and 4 were analysed in the CCP2-euro and AhFibA test.Results:In population 1, ACPA positivity was found in 17 of 450 (3.8%) patients without RA; 14 (82%) of these 17 samples were discrepant. In contrast, 61 of 86 (70.9%) patients with RA were ACPA positive of whom 18 of 61 (29.5%) were discrepant (70.9% vs. 29.5%, p<0.001). The discrepancies between tests could be partly attributed to borderline results, inter-assay discrepancy and inter-test variability. They were more prevalent in patients with systemic lupus erythematosus who were ACPA positive than in those with psoriatic arthritis who were ACPA positive.Conclusions:Discrepancy between different ACPA tests was observed attributable to the occurrence of borderline results, inter-assay variability and mainly to inter-test variability. The lowest inter-test discrepancy is observed between tests that use the same substrate.

scholarly journals The Clinical Course of Rheumatoid Arthritis in Kazakhstani Patients

2021 ◽  
Vol 9 (B) ◽  
pp. 1352-1358
Author(s):  
Argul Issilbayeva ◽  
Assel Meiramova ◽  
Almagul R. Kushugulova ◽  
Zhanar B. Akhmetova ◽  
Damir Biktashev ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Clinical Course ◽  
Strong Association ◽  
Stage Iv ◽  
Epidemiological Data ◽  
Discriminant Model ◽  
Peptide Antibody ◽  
Radiological Damage ◽  
Systemic Manifestations ◽  
Citrullinated Protein

BACKGROUND: Rheumatoid arthritis (RA) prevalence according to the worldwide epidemiological data varies from 0.4% to 1.3%. The disability and mortality rate in RA is high. RA clinic is various, and compiles from articular and systemic manifestations. AIM: The aim of our study was to investigate the clinical course of RA in Kazakhstani patients living in North region of our country. METHODS: The 81 women at the age of 30–55 years with a verified diagnosis of RA who have lived in Kazakhstan for at least 10 years were recruited to the study. All participants were examined by the rheumatologist and a standard laboratory examination was carried out. Statistical analysis was conducted in IBM SPSS Statistics 26 software (IBM.USA;1). RESULTS: The statistically significant higher frequency of erosive radiological stages, bone ankylosis (χ2 = 18.070 df = 6 p = 0.005) was found in seropositive (rheumatoid factor [RF]+) anti-citrullinated protein/peptide antibody positive (ACPA+) subgroup. The correlation analysis showed strong association between certain RA form activity and inflammatory markers, as well as disease triggers. The discriminant model which predicts the stage of radiological damage was obtained. The sensitivity of model in predicting X-ray Stage I-71.6%, Stage II-29.4%, Stage III-37.5%, and Stage IV-63.6%. CONCLUSION: The debut of the RA on average occurred in the third decade of the patients’ life. The joint syndrome had a more unfavorable character RF+ACPA+ patients’ subgroup; however, RF+ACPA-negative (ACPA-) subgroup also showed a predisposition to poorer prognosis. The obtained discriminant model may be useful for RA patients’ management.

scholarly journals Seropositivity and Antibody Profiling of Patients Are Dramatically Impacted by the Features of Peptides Used as Immunosorbents: A Lesson from Anti–Citrullinated Protein/Peptide Antibody

2018 ◽  
Vol 201 (11) ◽  
pp. 3211-3217 ◽  
Author(s):  
Martin Cornillet ◽  
Fruzsina Babos ◽  
Anna Magyar ◽  
Mireille Sebbag ◽  
Evelyne Verrouil ◽  
...  
Keyword(s):  
Peptide Antibody ◽  
Antibody Profiling ◽  
Citrullinated Protein
Sign in / Sign up

Export Citation Format

Share Document