Scientists are using new technology to create heart muscle patches that beat in sync with a patient's heart.
One of the major stumbling blocks with heart surgery is that grafted tissue does not always beat in sync with the rest of the heart.
But experts are now growing heart muscle cells from stem cells that contain proteins sensitive to light.
Light will then be used to control their beat.
This would reduce the effects of heart failure by cutting the chance of rhythm problems.
The groundbreaking research has brought together rival professors - Chris Denning from the UK and Lior Gepstein in Israel.
Prof Denning, from the University of Nottingham, said: "For years, Professor Gepstein and I have been competing to be the first in our field.
"But this project means that instead of each team doing the same things twice, we will be coordinating our efforts to ensure we can help heart patients as soon as possible."
The research is being funded by the British Heart Foundation and the British Council's Britain Israel Research and Academic Exchange partnership.
"The grant ensures we can work on a very promising technique for solving one of the major challenges in regenerative medicine to mend a broken heart," Prof Denning added.
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