Antibody-nucleic acid complexes. Antigenic domains within nucleosides as defined by solid-phase immunoassay

Area of Science:

• Immunology
• Biochemistry
• Analytical Chemistry

Background:

• Anti-nucleoside antibodies are crucial in various biological processes.
• Characterizing these antibodies requires sensitive and specific assay methods.
• Solid-phase immunoassays offer a potential platform for such characterization.

Purpose of the Study:

• To investigate the utility of solid-phase immunoassays for characterizing anti-nucleoside antibodies.
• To assess the specificity and sensitivity of these assays.
• To evaluate antibody cross-reactivity with various nucleoside haptens.

Main Methods:

• Production of rabbit polyclonal antibodies against specific nucleosides (guanosine, 7-methyl-guanosine, cytidine) conjugated to keyhole limpet hemocyanin (KLH).
• Development of solid-phase assays using microtiter wells coated with immobilized nucleoside-bovine serum albumin (BSA) conjugates.
• Quantification of antibody binding using radiochemically labeled IgG (3H) and analysis of cross-reactivity with a panel of nucleoside haptens.

Main Results:

• Solid-phase adsorption of nucleoside-BSA conjugates was uniform and irreversible.
• Nonspecific binding to BSA was negligible, with detection limits as low as 0.5 ng of antibody.
• Antibody retention was directly proportional to antibody concentration.
• Significant cross-reactivity was observed between anti-nucleoside antibodies and nonhomologous haptens.

Conclusions:

• Solid-phase immunoassays are a valuable tool for characterizing anti-nucleoside antibodies.
• The developed assays demonstrate high sensitivity and specificity.
• The findings highlight the cross-reactive nature of anti-nucleoside antibody responses.