MicroRNA 299-3p modulates replicative senescence in endothelial cells

Area of Science:

• Cell Biology
• Molecular Biology
• Genetics

Background:

• MicroRNAs (miRNAs) are key regulators of cellular processes.
• Replicative senescence in endothelial cells is linked to gene expression changes, but regulatory miRNAs are poorly understood.

Purpose of the Study:

• To identify miRNAs and their target genes involved in replicative senescence in human umbilical vein endothelial cells (HUVECs).
• To investigate the functional role of a specific miRNA, hsa-miR-299-3p, in endothelial cell senescence.

Main Methods:

• Integrated miRNA and gene profiling of young and senescent HUVECs.
• miRNA knockdown experiments to assess effects on target gene expression (IGF1) and senescence markers (β-galactosidase).
• Cell viability (MTT assay), proliferation, and migration assays were performed.

Main Results:

• hsa-miR-299-3p was upregulated in senescent HUVECs.
• Knockdown of hsa-miR-299-3p increased IGF1 mRNA expression, reduced senescence markers, and enhanced cell viability.
• hsa-miR-299-3p knockdown also improved proliferation in H2O2-induced senescence models.

Conclusions:

• hsa-miR-299-3p plays a role in modulating replicative senescence in HUVECs.
• This miRNA may delay senescence by enhancing metabolic activity rather than stimulating proliferation in senescent cultures.