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 The research, described as game-changing by experts
in the field, suggests human cells could in future be reprogrammed
by the same technique, offering a simpler way to replace damaged
cells or grow new organs for sick and injured people.
Chris Mason, chair of regenerative medicine bioprocessing at
University College London, who was not involved in the work, said
its approach in mice was "the most simple, lowest-cost and quickest
method" to generate so-called pluripotent cells — able to develop
into many different cell types — from mature cells.
"If it works in man, this could be the game changer that ultimately
makes a wide range of cell therapies available using the patient's
own cells as starting material — the age of personalized medicine
would have finally arrived," he said.
The experiments, reported in two papers in the journal Nature on
Wednesday, involved scientists from the RIKEN Center for
Developmental Biology in Japan and Brigham and Women's Hospital and
Harvard Medical School in the United States.
The researchers took skin and blood cells, let them multiply, then
subjected them to stress "almost to the point of death", they
explained, by exposing them to various events including trauma, low
oxygen levels and acidic environments.
One of these "stressful" situations was simply to bathe the cells in
a weak acid solution for around 30 minutes.
Within days, the scientists found that the cells had not only
survived but had also recovered by naturally reverting into a state
similar to that of an embryonic stem cell.
These stem cells — dubbed Stimulus-Triggered Acquisition of Pluripotency, or STAP, cells by the researchers — were then able to
differentiate and mature into different types of cells and tissue,
depending on the environments they were put in.
"NEW ERA"
"If we can work out the mechanisms by which differentiation states
are maintained and lost, it could open up a wide range of
possibilities for new research and applications using living cells,"
said Haruko Obokata, who lead the work at RIKEN.
Stem cells are the body's master cells and are able to differentiate
into all other types of cells. Scientists say that by helping to
regenerate tissue and potentially grow new organs, they could offer
ways of tackling diseases for which there are currently only limited
treatments.
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Recent experimental research has seen stem cells used to create a
functional human liver and to create beating heart muscle tissue.
There are two main types of stem cells: embryonic ones, harvested
from embryos, and adult or iPS cells, which are taken from skin or
blood and reprogrammed back into stem cells.
Because the harvesting of embryonic stem cells requires the
destruction of a human embryo, the technique has been the subject of
ethical concerns and protests from pro-life campaigners.
Dusko Ilic, a reader in stem cell science at Kings College
London, said the Nature studies described "a major scientific
discovery" and predicted their findings would open "a new era in
stem cell biology".
"Whether human cells would respond in a similar way to comparable
environmental cues ... remains to be shown," he said in an emailed
comment. "I am sure that the group is working on this and I would
not be surprised if they succeed even within this calendar year."
Robin Lovell-Badge, a stem cell expert at Britain's National
Institute for Medical Research, said it would be some time before
the exact nature and capabilities of the STAP cells would be fully
understood by scientists — and only then would their full potential
in medicine become clearer.
"But the really intriguing thing to discover will be the mechanism
underlying how a low pH shock triggers reprogramming," he said. "And
why does it not happen when we eat lemon or vinegar, or drink cola?"
(Editing by Kevin Liffey)
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