Melbourne Scientists Grow Heart Valves From Stem Cells

Scientists in Melbourne have grown human heart valve tissue in a lab for the first time, a discovery that could transform treatment for millions of children and adults living with heart valve disease.

Researchers at Murdoch Children's Research Institute used stem cells to create valve tissues that closely resemble those found in the human body. The breakthrough, published in Cell Stem Cell, gives doctors a powerful new way to test treatments and potentially grow replacement valves that adapt as young patients grow.

Heart valve disease affects about 28 million people worldwide when one or more of the heart's four valves don't open or close properly. Currently, there's no cure, and most patients need valve replacement surgery, which carries a high risk of blood clots and infections.

For children, the challenge is even harder. Because artificial valves don't grow, kids often need multiple surgeries as they get bigger, each one carrying serious risks.

Dr. Holly Voges, who led the research, says the lab-grown tissues could change everything. "We can now test and advance new treatments at scale in the lab," she said. The team also showed the platform can model inflammatory valve disease, which leads to rheumatic heart disease that disproportionately affects Indigenous Australians.

Seven-year-old Emily knows the struggle firsthand. Born with a rare combination of heart defects, she needed emergency open-heart surgery just five hours after birth. At five months old, doctors replaced a temporary shunt with a new valve, but she'll likely need another replacement in her teenage years.

Despite the challenges, Emily thrives. She loves playing outdoors with friends, painting, and drawing. Her mom Jessica recently visited the research lab where Emily's donated heart tissue supports future discoveries.

Why This Inspires

Jessica calls the research "pioneering" and says it fills the family with comfort knowing Emily's tissue is helping create better treatments. For families like hers, the possibility of replacement valves that grow with children represents a future without repeated surgeries and hospital stays.

Professor Enzo Porrello says the technology could eventually support development of stem cell-derived replacement valves that grow and adapt with patients. That means children born with damaged or missing valves might one day receive a single treatment that lasts a lifetime.

The research builds on Australia's world-leading stem cell expertise and offers particular hope for preventing rheumatic heart disease, which remains stubbornly common in parts of Australia despite being largely preventable.

For now, the lab-grown valves give researchers an unprecedented window into how heart valves develop, mature, and become damaged, accelerating the path toward regenerative medicine that could repair rather than just replace.