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Embryonic Stem Cells Turned Into Three Types of Heart Cells
Date:4/23/2008

When transplanted into mice, they improved heart function, researchers report

WEDNESDAY, April 23 (HealthDay News) -- A multinational team of researchers has succeeded in turning human embryonic stem cells into three types of human heart muscle cells.

When transplanted, the cells also improved heart function in mice.

The findings have a number of implications, the most immediate of which would be to use the cells to test drugs.

"We have now a supply of human heart cells for biotech and drug companies to start testing the beneficial effects of drugs or the toxic effects of drugs," said Gordon Keller, senior author of a paper published in this week's issue of Nature. "There are really no roadblocks in beginning to set up such tests."

Researchers may also be able to use the cells to make artificial heart tissue, which could then be transplanted into an actual human heart.

"It's not clear how effective injecting cells directly into the heart ever will be," said Keller, who is director of the McEwen Centre for Regenerative Medicine at University Health Network in Toronto. "A huge advantage we have is that these unique progenitor cells can make three of the major types of cells in the heart, so we hope we can simply seed these progenitor cells onto scaffolding and make what might be an artificial piece of heart tissue and possibly transplanting such small pieces of tissue, and engrafting them into the heart, would be more effective than transplanting the cells themselves."

Keller's lab had previously succeeded in coaxing cardiac cells out of mouse embryonic cells.

For this study, the team used similar principles, applying specific growth factors at different stages of development, but in human embryonic stem cells.

"They're showing that different 'recipes' can induce different types of cardiac cells," said Paul Sanberg, director of the Center for Aging and Brain R
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