Weizmann
Institute of Science in Israel and Victor Chang Institute in Sydney make
discovery which may have major implications for heart attack sufferers
The Guardian, Melissa Davey, Tuesday 7 April 2015
Unlike animals such as the salamander and the zebrafish, humans are unable to easily regenerate heart cells, making it difficult to recover from the permanent damage caused by heart attacks.
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| Research suggests possibility of regenerating heart tissue damaged after a heart attack. Photograph: Alamy |
Unlike animals such as the salamander and the zebrafish, humans are unable to easily regenerate heart cells, making it difficult to recover from the permanent damage caused by heart attacks.
But
scientists from the Weizmann Institute of Science in Israel and the Victor
Chang Institute in Sydney have discovered a way to stimulate heart muscle cells
to grow, which could have major implications for heart attack sufferers in the
future.
While human
blood, hair and skin cells renew themselves throughout life, cell division in
the heart comes to almost a standstill shortly after birth, an author of the
research, Prof. Richard Harvey, said.
“So there’s
always been an intense interest in the mechanism salamanders and fish use which
makes them capable of heart regeneration, and one thing they do is send their
cardiomyocytes, or muscle cells, into a dormant state, which they then come out
of to go into a proliferative state, which means they start dividing rapidly
and replacing lost cardiomyocytes,” Harvey, from Victor Chang’s cardiac
research institute, said.
“There are
various theories why the human heart can not do that, one being that our more
sophisticated immune system has come at a cost, and because human
cardiomyocytes are in a deeper state of quiescence, that has made it very
difficult to stimulate them to divide.”
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But through
studying mice, Harvey and his colleagues have uncovered a way to overcome that
regenerative barrier – at least in the rodents.
They found
that by stimulating a signalling system in the heart driven by a hormone called
neuregulin, heart muscle cells divided in a spectacular way in both adolescent
and adult mice. In humans, this hormone is usually blunted about one week after
birth, and by about 20 weeks after birth in mice.
The
triggering of the neuregulin pathway following a heart attack in the mice lead
to replacement of lost muscle, repairing the heart to a level close to that
prior to the heart attack.
Harvey said
scientists should know within five years whether it is possible to replicate
the results in humans.
“This is
such a significant finding that it will harness research activities in many
labs around the world, and there will be much more attention now on how this
neuregulin-response could be maximised,” Harvey said.
“We will
now examine what else we can use, other than genes, to activate that pathway,
and it could be that there are already drugs out there, used for other
conditions and regarded as safe, that can trigger this response in humans.”
Heart
attacks occur when one of the vessels that feed blood to the heart muscle
becomes blocked, causing billions of cardiomyocytes to die. Many people who
survive a heart attack have a diminished quality of life because of this.
“The dream
is that one day we will be able to regenerate damaged heart tissue, much like a
salamander can regrow a new limb if it is bitten off by a predator,” Harvey
said.
The
research was led by molecular biologist Gabriele D’Uva and the findings were
published on Tuesday in the scientific journal Nature Cell Biology.
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