miR-483-5p orchestrates the initiation of protein synthesis by facilitating the decrease in phosphorylated...

Area of Science:

• Molecular Biology
• Gene Regulation
• Cancer Research

Background:

• Eukaryotic initiation factor 4E (eIF4E) is crucial for protein synthesis regulation in health and disease.
• MicroRNAs (miRNAs) regulate gene expression by targeting mRNAs, but their role in eIF4E regulation is unclear.
• Understanding miRNA-mediated regulation of eIF4E is vital for developing novel therapeutic approaches.

Purpose of the Study:

• To investigate the regulatory role of miR-483-5p on eukaryotic translation initiation factor 4E (eIF4E) and its associated proteins.
• To identify and experimentally verify the mRNA targets of miR-483-5p involved in protein synthesis.
• To elucidate the effect of miR-483-5p on eIF4E phosphorylation.

Main Methods:

• Bioinformatic prediction of miR-483-5p targets using TargetScan and Web of Science databases.
• Experimental verification of miR-483-5p targets (ERK1, MKNK1, EIF4EBP1, EIF4EBP2, EIF4E) in HEK293 cells.
• Quantitative analysis of mRNA levels and protein phosphorylation (pSer209eIF4E).

Main Results:

• miR-483-5p was predicted to target EIF4E, EIF4EBP1, and EIF4EBP2.
• miR-483-5p significantly reduced ERK1 and MKNK1 mRNA levels and suppressed EIF4EBP1 and EIF4EBP2 expression.
• miR-483-5p decreased the phosphorylation of eIF4E at Ser209 (pSer209eIF4E) without affecting total eIF4E levels.

Conclusions:

• miR-483-5p modulates eIF4E phosphorylation through a multi-targeting mechanism affecting the ERK1/MKNK1 pathway.
• Unlike single-target siRNAs, miRNAs can regulate entire pathways, offering a distinct therapeutic advantage.
• Further exploration of miR-483-5p in cancer models may reveal novel therapeutic opportunities.