miR548ai antagonism attenuates exosome-induced endothelial cell dysfunction

Area of Science:

• Vascular Biology
• Cellular Communication
• MicroRNA Therapeutics

Background:

• Endothelial cells (ECs) and smooth muscle cells (SMCs) are key vascular components.
• Dysfunctional SMCs communicate via exosomes, inducing EC dysfunction and impairing vascular homeostasis.
• MicroRNAs play critical roles in cell-cell communication and vascular pathogenesis.

Purpose of the Study:

• To investigate the role of microRNA 548ai (miR548ai) in SMC-EC communication.
• To identify miR548ai as a potential molecular target for mitigating EC dysfunction induced by dysfunctional SMC-derived exosomes.
• To explore the therapeutic potential of miR548ai inhibition in vascular disorders.

Main Methods:

• Microarray profiling and quantitative PCR (qPCR) to identify upregulated microRNAs in cytokine-stimulated human aortic SMCs.
• Isolation and characterization of exosomes from stimulated SMCs.
• Assessment of EC proliferation and migration after exposure to SMC-derived exosomes.
• Transfection of miR548ai inhibitors into ECs and SMCs to evaluate functional effects.

Main Results:

• Cytokine stimulation robustly upregulated miR548ai in human aortic SMCs.
• miR548ai was also upregulated in exosomes derived from these dysfunctional SMCs.
• SMC-derived exosomes impaired EC proliferation and migration.
• Transfection of miR548ai inhibitor into ECs countered exosome-induced EC dysfunction.
• Inhibiting miR548ai in SMCs attenuated SMC dysfunction and proliferation.

Conclusions:

• miR548ai is a key mediator of communication between dysfunctional SMCs and ECs via exosomes.
• miR548ai inhibition represents a promising therapeutic strategy to protect against SMC/exosome-induced EC dysfunction.
• Targeting miR548ai may offer a novel approach for treating vascular disorders.