The interaction of anti-DNA antibodies with DNA antigen: Evidence for hysteresis for high avidity binding.
Clin Immunol
; 231: 108848, 2021 10.
Article
em En
| MEDLINE
| ID: mdl-34492381
ABSTRACT
Antibodies to DNA (anti-DNA) are the serological hallmark of systemic lupus erythematosus. Previous studies have indicated that the phosphodiester backbone is the main antigenic target, with electrostatic interactions important for high avidity. To define further these interactions, the effects of ionic strength on anti-DNA binding of SLE plasmas were assessed in association and dissociation assays by ELISA. As these studies demonstrated, increasing ionic strength to a concentration of 1000 mM NaCl reduced antibody binding although the extent of the reduction varied among samples. In dissociation assays, differences among plasmas were also observed. For one of the plasmas, binding to DNA displayed resistance to dissociation by increasing ionic strength even though these concentrations limited binding in association assays. Time course studies showed a gradual change in binding interactions. These studies indicate that anti-DNA binding can involve both electrostatic and non-electrostatic interactions, with binding in some plasmas showing evidence of hysteresis.
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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
DNA
/
Anticorpos Antinucleares
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Lúpus Eritematoso Sistêmico
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Afinidade de Anticorpos
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Complexo Antígeno-Anticorpo
Limite:
Humans
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article