Regenerative heart valves implanted for the first time

Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing replacement parts in the laboratory, forms a key part of this research.

The parts can be used to replace defective cells and tissues in the body and restore their normal functioning. The bioengineered replacements have significant advantages over the artificial implants currently in use: They do not cause immune reactions in the patient’s body, and they can grow and regenerate themselves.

An international consortium led by UZH Professor Simon P. Hoerstrup has now reached a milestone on the road towards being able to treat heart patients using new heart valves cultured from human cells: As part of the EU-funded project LifeValve, for the first time the team, using computer simulations, succeeded in individually predicting how well cultured heart valves would grow, regenerate, and function in large animal models (sheep).

“Thanks to the simulations, we can optimise the design and composition of the regenerative heart valves and develop customised implants for use in therapy,” says Hoerstrup of the Institute of Regenerative Medicine at UZH.

In particular, changes to the structure of the heart valve that occur in the body during the dynamic regeneration process can be predicted by computer simulations and anticipated accordingly in the design.

The results that have now been published in the journal Science Translational Medicine are a significant step towards the routine application of the Zurich-developed tissue engineering technology in the future.

Moreover, the findings provide a basic conceptual contribution that will aid the successful transfer to clinical use of new bioengineering technologies in regenerative medicine.

Valvular heart disease is one of the major causes of morbidity and mortality worldwide. Currently available artificial heart valve prostheses are an unsatisfactory solution, in particular for children with congenital heart defects.

Children with defective heart valves or blood vessels often have to undergo an operation to have them replaced by prostheses which cannot grow as the child’s body grows. This means they then require multiple reoperations with an associated increased risk of surgical complications and considerable psycho-social stress for the young patients and their families.

Prostheses of animal origin – e.g. from pigs or cows – also wear out with time and have to be replaced. Adult patients could therefore also benefit from regenerative heart valves and blood vessels.

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Image credit: University of Zurich.