A miRNA cassette reprograms smooth muscle cells into endothelial cells

Area of Science:

• Regenerative Medicine
• Molecular Biology
• Vascular Biology

Background:

• MicroRNAs (miRNAs) are key regulators of cellular processes like proliferation and differentiation.
• Vascular diseases often involve endothelial cell injury or dysfunction.
• Cellular reprogramming offers potential for regenerative therapies.

Purpose of the Study:

• To investigate the transdifferentiation of vascular smooth muscle cells (SMCs) into endothelial cells (ECs) using miRNAs.
• To identify a specific miRNA combination for efficient SMC-to-EC reprogramming.
• To evaluate the therapeutic potential of induced ECs (iECs) in a preclinical model.

Main Methods:

• miRNA profiling of SMCs and ECs.
• Combinatorial miRNA transfections of human coronary SMCs.
• Transcriptome and protein expression analysis of induced cells.
• Functional assessment of iECs in a murine hindlimb ischemia model.

Main Results:

• A 4-miRNA cassette (miR-143-3p/miR-145-5p inhibitors, miR-146a-5p/miR-181b-5p mimics) efficiently reprogrammed SMCs into iECs.
• iECs exhibited high similarity to native ECs in terms of gene expression, protein markers, and function.
• Injected iECs accelerated blood flow recovery in a murine hindlimb ischemia model compared to conventional ECs.

Conclusions:

• A specific 4-miRNA combination is sufficient to reprogram SMCs into ECs.
• Induced ECs possess functional characteristics similar to native ECs.
• This miRNA-mediated reprogramming strategy presents a promising regenerative approach for endothelial repair in vascular diseases.