Single-Stranded DNA Aptamers Against TNF and Their Potential Applications

Area of Science:

• Biochemistry
• Molecular Biology
• Immunology

Background:

• Aptamers are short nucleic acid sequences with high affinity for specific targets.
• Tumor Necrosis Factor (TNF) is a critical inflammatory cytokine in autoimmune diseases.
• Current TNF inhibitors are effective but costly and not universally responsive.

Purpose of the Study:

• To select and characterize DNA aptamers targeting TNF.
• To evaluate the potential of these aptamers as TNF inhibitors.
• To explore their use as diagnostic probes for TNF.

Main Methods:

• Systematic Evolution of Ligands by Exponential Enrichment (SELEX) was used to identify DNA aptamers against TNF.
• The selected aptamers' binding affinity and specificity for TNF were assessed.
• The bioactivity of aptamers in blocking TNF-mediated cytotoxicity in vitro was evaluated.

Main Results:

• Novel single-stranded DNA aptamers that bind specifically to TNF were successfully selected.
• These aptamers demonstrated significant inhibition of TNF-mediated cytotoxicity in cellular assays.
• The selected aptamers represent a promising new class of TNF-targeting molecules.

Conclusions:

• DNA aptamers offer a viable alternative to current biological TNF inhibitors.
• Aptamers can be engineered for therapeutic applications in autoimmune diseases.
• Selected aptamers hold potential for developing in vivo probes for TNF detection.