Objective:

To summarize current knowledge of glycoRNAs and their interactions with immune receptors, highlighting their emerging role in immune regulation at the cell surface.

Approach:

• Discovery of GlycoRNAs: GlycoRNAs were identified as RNA-glycan conjugates on the cell surface through glycan metabolic labeling and bioorthogonal click chemistry.
• Molecular Features: GlycoRNAs consist of small noncoding RNAs modified with N- or O-linked glycans, localizing to the outer leaflet of the plasma membrane, and can assemble with cell surface RNA-binding proteins.
• Immune Receptor Engagement: GlycoRNAs interact with multiple immune receptors, including P-selectin, Siglecs, Toll-like receptors (TLRs), and lectins, influencing neutrophil trafficking and immune responses.

Key Findings:

• GlycoRNAs are a novel class of RNA-glycan conjugates found on cell surfaces.
• They engage multiple immune receptor families, including P-selectin, Siglecs, and TLRs, to influence immune processes.
• Interactions between glycoRNAs and P-selectin are crucial for neutrophil recruitment.

Interpretation:

GlycoRNAs represent a new layer of immune regulation, facilitating interactions between immune receptors and glycan structures.

Limitations:

• The study primarily focuses on the molecular features and interactions of glycoRNAs without extensive in vivo validation.
• Further research is needed to fully elucidate the functional implications of glycoRNA-immune receptor interactions.

Conclusion:

GlycoRNAs may serve as important ligands in immune recognition, contributing to immune regulation at the cell surface.