Antibodies ot double-stranded RNA: specificity and serum nucleases

Area of Science:

• Immunology
• Virology
• Molecular Biology

Background:

• Antibodies are crucial for specific molecular recognition.
• Double-stranded ribonucleic acid (ds RNA) plays roles in viral replication and cellular defense.
• Characterizing the specificity of antibodies to nucleic acids is vital for research and diagnostics.

Purpose of the Study:

• To generate and characterize an antiserum specific for double-stranded RNA (ds RNA).
• To investigate potential cross-reactivity with single-stranded RNA (ss RNA) and DNA.
• To assess the impact of inherent serum enzymatic activity on antibody specificity determination.

Main Methods:

• Production of rabbit antiserum against synthetic polyriboinosinic:polyribocytidylic acid (poly rI:rC).
• Liquid-phase radioimmunoassay to quantify antibody binding to various nucleic acid types.
• Enzyme inhibition assays using macaloid to block serum ribonuclease activity.

Main Results:

• The prepared antiserum demonstrated high specificity for ds RNA, binding 95% of cytoplasmic polyhedrosis virus RNA.
• No significant binding was observed with single-stranded RNA (ss RNA) or deoxyribonucleic acid (DNA).
• Serum ribonuclease activity, initially degrading ss RNA, was inhibited, confirming that lack of ss RNA binding was due to antibody specificity, not antigen degradation.

Conclusions:

• The generated antiserum is highly specific for ds RNA.
• The presence of nucleic acid-degrading enzymes in antisera necessitates careful validation of antibody specificity.
• These findings highlight the importance of rigorous controls in immunological assays involving nucleic acid antigens.