45-minute operation to restore sight to millions
by FIONA MACRAE
A revolutionary technique being developed by
British scientists could cure blindness in millions of people around
the world. The first 45-minute operations could take place within
five years and could be as commonplace as cataract surgery in a
decade.
The improvement is likely to be great enough to
transform lives, allowing the blind to regain the ability to carry
out everyday tasks such as reading or driving.
The pioneering stem cell surgery tackles
age-related macular degeneration (AMD), the most common cause of
blindness in the elderly. There are about 300,000 sufferers in this
country and the number is expected to treble in the next 25 years to
around one million as the population ages.
Sight degenerates as cells die. AMD,
which affects a quarter of over-60s in the UK and more than half of
over-75s to some degree, occurs in two forms. While the "wet" form
can be combated with drugs, there is no treatment for the "dry" form
which accounts for 90 per cent of cases.
The treatment centers on human embryonic stem
cells grown in a laboratory. These are "blank" cells with the power
to turn into different cell types and are used to create small
patches identical to the cells damaged in the eyes of AMD sufferers.
Packaged into a syringe, the patch is injected
into the back of the eye where it replaces damaged cells and
restores sight.
The technique is being developed by scientists
and doctors from University College London, Moorfields Eye Hospital,
also in London, and Sheffield University, working together in the
London Project to Cure Blindness.
Their work has been boosted by a £4million
donation from an anonymous American benefactor.
Last night project director Professor Pete Coffey said: "This could
have a tremendous effect on a huge population who have no current
therapy."
How the new treatment will help save a patient's eyesight
The technique has been tested on rats suffering from a condition
similar to AMD and their sight was restored.
Further evidence that the technique is likely to succeed comes from
human operations. In these, the researchers restored vision using
healthy cells taken from the corner of the patient's own eye.
In some cases, the transplants were so successful that the patients
were able to read, cycle and use a computer.
However, such surgery is extremely complex and time-consuming and so
unlikely to be suitable for large-scale use. Using "readymade"
patches of cells would greatly simplify the operation, making it
suitable for use on millions.
The scientists are now working on making such patches, measuring
just four by six millimeters, which will be injected into the back
of the eye under local anesthetic in an procedure lasting between
45 minutes and an hour.
The patient, who would have to take drugs to stop the cells from
being rejected by the body, could go home the same day. After two to
three weeks, vision should start to improve.
It is not yet known how long the effects will last but the patients
who had transplants of their own cells are still benefiting from the
treatment which took place two and a half years ago.
While the patches are most likely to benefit those in the early
stages of AMD, the researchers believe it should be possible to
adapt them to treat those in later stages.
It is hoped that the technique might also benefit those who have
lost their sight as a complication of diabetes.
Consultant surgeon Lyndon da Cruz of Moorfields Eye Hospital said
that within ten years the procedure could become as commonplace as
cataract surgery.
He said: "If we can do a single procedure in a person under local
anesthetic in 45 minutes, it's feasible.
"The science is something we can work on but the surgery has to be
something we can deliver to many people."
Eye experts said the research offered real hope to sufferers of AMD.
Tom Bremridge of the Macular Disease Society said: "This development
is exciting and encouraging for current and future generations of
AMD patients.
"While treatments for "wet" AMD are advancing rapidly, sadly,
patients with "dry" AMD have had no prospect of any viable therapy."
Professor Alistair Fielder, of the charity Fight for Sight, said the
research represented "a real chance to tackle an untreatable
condition and bring hope to many".
He added: "It is marvellous to think that clinical trials could
start within four years."
Although many believe it is wrong to use embryonic stem cells -
plucked from an embryo in the first days of life - in medicine,
sophisticated laboratory techniques mean it should be possible to
generate a treatment for millions of people from cells derived from
a single embryo.
Stem cell research offers hope for treating and curing a host of
conditions.
In recent work, British experts have succeeded in growing a "miniliver"
- a tiny bundle of liver cells - from stem cells, while Israeli
scientists have grown a tiny section of beating heart tissue from
stem cells gleaned from human embryos.
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April 11, 2007 - by David Rose
Diabetics cured by stem-cell treatment
People with type 1 diabetes have to give themselves
regular injections to control blood sugar levels, as their ability to
create the hormone naturally is destroyed by an immune disorder.
All but two of the volunteers in the trial, details of which are
published today in the Journal of the American Medical Association (JAMA),
do not need daily insulin injections up to three years after stopping
their treatment regimes.
The findings were released to reporters yesterday as the future of US
stem-cell research was being debated in Washington.
Stem cells are immature, un programmed cells that have the ability to
grow into different kinds of tissue and can be sourced from people of
all ages.
Previous studies have suggested that stem-cell therapies offer huge
potential to treat a variety of diseases such as Alzheimer’s,
Parkinson’s and motor neuron disease. A study by British scientists in
November also reported that stem-cell injections could repair organ
damage in heart attack victims.
But research using the most versatile kind of stem cells — those
acquired from human embryos — is currently opposed by powerful critics,
including President Bush.
The JAMA study provides the first clinical evidence for the efficacy of
stem cells in type 1 diabetes. Sufferers of the chronic condition, which
normally emerges in childhood or early adulthood, have to inject
themselves at least four times a day.
Type 2 diabetes, which tends to affect people later in life, is linked
to lifestyle factors such as obesity. There are almost two million type
2 diabetics in Briton, most of whom control their blood-sugar levels
with pills or through diet.
The new study, by a joint team of Brazilian and American scientists,
found that one of the first patients to undergo the procedure has not
used any supplemental synthetic
insulin for three years. “Very encouraging results were obtained in a
small number of patients with early-onset disease,” the authors, led by
Julio Voltarelli, from the University of São Paulo in Ribeirão Preto,
Brazil. write. “Ninety-three per cent of patients achieved different
periods of insulin independence and treatment-related toxicity was low,
with no mortality.”
Type 1 diabetes occurs when the body’s own immune system malfunctions
and destroys the insulin-producing beta cells of the pancreas, causing a
shortage in the hormone.
By the time most patients receive a clinical diagnosis, 60 to 80 per
cent of their beta cells have been wiped out. The disease progresses
from this point very quickly, and can result in serious long-term
complications including blindness, kidney failure, heart disease and
stroke.
Dr Voltarelli’s team hoped that if they intervened early enough they
could wipe out and then rebuild the body’s immune system by using stem
cells, preverving a reservoir of beta cells and allowing them to to
regenerate.
They enrolled Brazilian diabetics aged between 14 and 31 who had been
diagnosed within the previous six weeks. After stem cells had been
harvested from their blood, they then underwent a mild form of
chemotherapy to eliminate the white blood cells causing damage to the
pancreas. They were then given transfusions of their own stem cells to
help rebuild their immune systems.
Richard Burt, a co-author of the study from Northwestern University’s
Feinberg School of Medicine in Chicago, said that 14 of the 15 patients
were insulin-free for some time following the treatment. Eleven of those
were able to dispense with supplemental insulin immediately following
the infusion of stem cells and have not had recourse to synthetic
insulin since then, he said.
“Two other patients needed some supplemental insulin for 12 and 20
months after the procedure, but eventually both were able to wean
themselves from taking daily shots,” he added. One patient went 12
months without shots, but relapsed a year after treatment after
suffering a viral infection, and resumed daily insulin injections.
Another volunteer was eliminated from the study because of
complications. The therapy, known as autologous hematopoietic stem cell
transplantation, has already shown benefits to individuals with a range
of auto-immune diseases such as rheumatoid arthritis, Crohn’s disease
and lupus.
There are still question marks about exactly how the treatment works,
and further studies will be required to fully evaluate it’s safety and
efficacy.
“As a research scientist I am always hesitant to speak of a cure, but
the initial results have been good and show the importance of conducting
more trials,” Dr Burt said.
Given the right funding opportunities, university hospitals in London
could be conducting research into the therapy within the next 12 months,
he added.
“It will probably be five to eight years before we see a treatment being
widely available,” he said.
In an accompanying editorial in JAMA, Dr Jay Skyler, of the Diabetes
Research Institute at the University of Miami, wrote: “Research in this
field is likely to explode in the next few years and should include
randomised controlled trials, as well as mechanistic studies."
_____________________________________________________________
April 2, 2007 Medical news developments, compiled by editors of
HealthDay:
Scientists Grow Human Heart Valve From Stem
Cells
In a world first, British scientists grew a human heart valve from
stem cells. The breakthrough, which took a decade to achieve, was led by
internationally renowned heart surgeon Sir Magdi Yacoub, a professor of
cardiac surgery at Imperial College London.
Animals tests are scheduled for later this year. If they prove
successful, this method could be available within a few years to treat
heart disease patients, the Daily Mail reported.
Yacoub and his team used chemical and physical means to coax bone
marrow stem cells to grow into heart valve cells. They then placed the
cells into scaffolds made of collagen and grew small discs of heart
valve tissue.
This research is a major advance toward the goal of growing an entire
beating heart, the Daily Mail reported.
"It is an ambitious project but not impossible. If you want me to
guess I'd say 10 years," Yacoub said. "But experience has shown that the
progress that is happening nowadays makes it possible to achieve
milestones in a shorter time. I wouldn't be surprised if it was some day
sooner than we think."
__________________________________________
Friday January 26th, 2007
The Virgin mogul, Sir
Richard Branson, has launched one of his most controversial business moves yet
as he moves into the biotech market of human embryonic stem cell storage. Major
questions that come up are: What are the pros and cons and debate of
stem cell therapy and research?
The business will allow parents a chance to put the umbilical
blood (from the placenta or umbilical cord) of their new born children into
storage for future use as science and medicine advance. Hopefully in the
future the families will be able to use the stem cells to cure future diseases
and cancer. Stem cells from your own body have a higher chance of adapting
than cells from a donor.
The Virgin-branded company will be launched next Thursday and
is expected to offer parents the chance to put the umbilical blood of their
newborn children into cold storage. Scientists believe that future advances in
medical technology will use stem cells to cure diseases such as Alzheimer’s and
cancer.
______________________________________________________________________________
This is a new site that will serve as an international
platform and directory of information as this technology begins to emerge.
email: info@stemcell-storage.com
