Spatially and Multivalent Matched Neutralizing Aptamer-Based DNA Nanostructure Alleviates Shiga Toxin Type 2...

Area of Science:

• Biotechnology
• Nanotechnology
• Molecular Biology

Background:

• Shiga toxin type 2 (Stx2) poses a significant global health threat, causing severe conditions like hemolytic uremic syndrome.
• Current strategies to combat Stx2 infection are limited, necessitating innovative therapeutic approaches.

Purpose of the Study:

• To design and evaluate a novel DNA-nanoframework-based strategy for neutralizing Stx2.
• To inhibit Stx2 cellular entry and infection through aptamer-mediated binding.

Main Methods:

• Designed self-assembling DNA tetrahedral nanoframes (TDN) to display three aptamers (TDN-S).
• TDN-S aptamers bind to specific sites on the Stx2 B subunit, blocking Gb3 receptor interaction.
• Evaluated Stx2 inhibition in vitro using cell viability, fluorescence imaging, and ROS assays.
• Assessed in vivo efficacy by measuring damage to liver, kidneys, intestines, and inflammatory responses.

Main Results:

• TDN-S demonstrated excellent neutralization efficiency against Stx2, achieving an 80.44% inhibition rate in vitro.
• The treatment significantly reduced organ damage and inflammatory responses in vivo.
• The multimodal interaction strategy proved effective in mitigating Stx2 toxicity.

Conclusions:

• The DNA nanoframes with aptamer assembly (TDN-S) offer a potent strategy for neutralizing Stx2.
• This approach provides a new avenue for alleviating Stx2 toxicity and serves as a model for inhibiting other toxins.