Antisense Oligonucleotide Pulldown and Silencing of Circular RNA Nfix In Vivo in Neonatal Mouse Lungs

Area of Science:

• Molecular Biology
• RNA Therapeutics
• Neonatal Research

Background:

• Circular RNAs (circRNAs) are emerging as potent regulators of gene expression.
• circRNAs can modulate biological processes by interacting with microRNAs (miRNAs) and RNA-binding proteins.
• Functional characterization of circRNAs is crucial for developing RNA-based therapeutics.

Purpose of the Study:

• To confirm the interaction between circNfix and miR204-5p in neonatal mouse lungs.
• To develop and evaluate a novel circNfix-targeting GapmeR for in vivo RNA silencing.
• To assess the therapeutic potential of circNfix silencing in a neonatal hyperoxia-induced lung injury model.

Main Methods:

• Pulldown assay using biotin-labeled antisense oligonucleotide (ASO) against circNfix.
• Confirmation of circNfix and miR204-5p interaction.
• Design and intranasal administration of a specific circNfix GapmeR in neonatal mouse pups.
• Evaluation of circNfix GapmeR efficacy in a hyperoxia-induced neonatal lung injury model.

Main Results:

• The study successfully confirmed the interaction between circNfix and miR204-5p in neonatal mouse lungs.
• A specific GapmeR targeting circNfix was designed and administered intranasally.
• This represents the first in vivo application of a circNfix GapmeR in a neonatal disease model via intranasal delivery.

Conclusions:

• circNfix plays a role in regulating miR204-5p in neonatal lungs.
• Intranasal delivery of circNfix GapmeR is a viable strategy for in vivo RNA silencing in neonates.
• This approach holds promise for developing novel RNA-based therapeutics for neonatal respiratory diseases.