An electrochemical biosensor for rapid detection of anti-dsDNA antibodies in absolute scale.
Analyst
; 143(16): 3874-3882, 2018 Aug 06.
Article
em En
| MEDLINE
| ID: mdl-30019710
Autoimmune diseases are chronic inflammatory pathologies that are characterized by the presence of antibodies against the body's own epitopes in serum (autoantibodies). Systemic lupus erythematosus (SLE) is a common autoimmune pathology characterized by the presence of antinuclear antibodies (ANAs). These include anti-dsDNA (α-dsDNA) antibodies, which are widely used for diagnosis and disease monitoring. Their determination is carried out using traditional techniques such as Indirect Immunofluorescence (IFI) or Enzyme-Linked Immunosorbent Assay (ELISA), which are time consuming, require qualified technicians, and are not compatible with decentralized analysis outside a laboratory facility. Here, we show a sandwich-format electrochemical biosensor-based method for α-dsDNA determination in a rapid and simple manner. The total assay time is only 30 minutes, and the sensor is capable of detecting 16 ng (8 µg mL-1) of α-dsDNA antibodies. Using the current derived from the detection limit of the method as a cut-off, we could discriminate positive from negative serum samples with 90% sensitivity and 100% specificity. Using monoclonal antibodies for calibration curves, our results are presented in absolute scale (i.e., concentration instead of serum titer) which will help us to perform comparisons between methods and carry out further improvements of this protocol. In an effort to render the sensor compatible with automation, we minimized the manipulation steps without compromising the analytical performance, even in complex samples such as serum.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Técnicas Biossensoriais
/
Anticorpos Antinucleares
/
Lúpus Eritematoso Sistêmico
Tipo de estudo:
Diagnostic_studies
/
Guideline
Limite:
Humans
Idioma:
En
Revista:
Analyst
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Uruguai
País de publicação:
Reino Unido