Exosome RNA Exosome RNA Research & Industry News
Aortic valve stenosis (AS) is a serious condition where the heart’s aortic valve becomes narrowed and stiff, forcing the heart to work harder to pump blood. Researchers are working to understand the biological processes that make this happen, especially why valve tissue becomes calcified (hardened with calcium deposits).
New research led by scientists from Uppsala University in Sweden investigated the role of extracellular vesicles (EVs), tiny particles released by cells that carry proteins, lipids, and genetic material. The team focused on microRNAs (miRNAs), small RNA molecules that help regulate gene activity, and how they might contribute to calcification.
The researchers found that EVs from patients with severe aortic stenosis contained altered levels of certain microRNAs compared to those from healthy people. In particular, two microRNAs, miR-455-3p and miR-103a-3p, were strongly linked to the calcification process in valve interstitial cells (VICs), the cells that make up the heart valve tissue.
These microRNAs seemed to influence the activity of important calcification-related genes, including osteocalcin, osteopontin, BMP4, and the transcription factor RUNX2. When the altered microRNAs were blocked, the calcification process slowed down, suggesting a possible therapeutic target.
This work shows that EVs are not just byproducts of disease but active messengers that can promote harmful changes in heart tissue. Understanding their role could open new avenues for preventing or treating aortic valve disease.
