Scientists Perfect Method to Freeze Heart Cells for Future Cardiac Therapies

Heart disease remains a leading cause of death, making advances in cardiac research crucial for extending healthspan. Researchers at the University of Alberta have developed a groundbreaking method to cryopreserve cardiac endothelial cells - the cells that line blood vessels in the heart - with remarkable success rates.

The team used an "interrupted slow cooling" technique on mouse cardiac endothelial cell monolayers. They tested various freezing protocols and found that combining three protective compounds - dimethyl sulfoxide, hydroxyethyl starch, and chondroitin sulfate - along with specialized substrates, achieved optimal results. The cells were cooled gradually to -40°C before being plunged into liquid nitrogen.

The results were impressive: 95% of cells survived the freezing and thawing process while maintaining their essential functions. The preserved cells retained their ability to form blood vessel-like structures, respond to calcium signals, and express key proteins necessary for proper cell-to-cell connections.

This breakthrough has significant implications for cardiovascular medicine. Researchers can now store functional heart cells for future use in studying heart disease mechanisms, testing potential cardiotoxic effects of new drugs, and developing regenerative therapies. The technique could accelerate cardiac research by providing consistent, on-demand access to viable heart cells.

While promising, this research was conducted on mouse cells in laboratory conditions, so human applications require further validation.