Arginine Polymerization Boosts Anti-Inflammatory Effects and DNA Nanostructure-Assisted siRNA Delivery in Acute...

Area of Science:

• Biomedical Engineering
• Nanomedicine
• Immunology

Background:

• Severe lung inflammation and ARDS are critical conditions with limited treatment options.
• Arginine polymerization enhances anti-inflammatory properties and DNA nanostructure assembly.
• Polyarginine improves cellular uptake of DNA nanostructures for drug delivery.

Purpose of the Study:

• To investigate polyarginine's potential as an anti-inflammatory prodrug.
• To develop a novel nanomedicine for ARDS therapy using arginine-assembled DNA nanotubes.
• To evaluate the efficacy of a combination therapy for ARDS.

Main Methods:

• Polymerization of arginine and RNA transcription sequencing to analyze anti-inflammatory effects.
• Assembly of arginine trimer (3R)-DNA nanotubes carrying p65 siRNA (NT^3R-p65).
• Flow cytometry for cellular uptake efficiency assessment and in vitro/in vivo ARDS models for therapeutic evaluation.

Main Results:

• Polyarginine upregulated the anti-inflammatory cytokine IL-4.
• Polyarginine-assembled DNA nanotubes showed enhanced cellular uptake compared to magnesium-assembled ones.
• NT^3R-p65 effectively suppressed lung inflammation in vitro and in ARDS mouse models, demonstrating additive effects with p65 siRNA.

Conclusions:

• The combination of polyarginine prodrug and p65 siRNA offers a potential therapeutic strategy for ARDS.
• This approach leverages enhanced DNA nanostructure delivery and synergistic anti-inflammatory actions.
• Further development could extend this strategy to other severe lung inflammation diseases.