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Heart Muscle can Regenerate After Birth as Well

by Kathy Jones on May 15, 2014 at 7:27 PM
 Heart Muscle can Regenerate After Birth as Well

While it is generally believed that heart cells lose their ability to replicate soon after the birth, a new study suggests that the heart muscle can regenerate for a long time after birth.

Researchers led by Bob Graham from the Victor Chang Cardiac Research Institute carried out their study in a group of mice and found that a surge in thyroid hormone led to an increase in the division of heart muscle cells for a 24-hour period, raising the number of heart muscle cells by 40 percent.

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The researchers said that this burst was essential in order to meet the increased circulatory demand on the heart during preadolescence, during which the heart increases almost four-fold in size. The study has been published in the journal Cell.

"Heart muscle cells retain the ability to divide and make new cells for a long time after birth, at least until preadolescence, equivalent to eight to ten years of age in humans. The implications of our findings could be huge, as it may give us a significant window of opportunity in which to repair the hearts of babies born with heart defects, or even to reactivate heart muscle cells damaged after a heart attack in adults", Graham said.



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