“Latest Stem Cells News”

Researchers in the U.S. say they may have found a new and better source for harvesting stem cells: the placentas that are often discarded after birth.

The research from Children’s Hospital & Research Center Oakland found there are far more stem cells in placentas than in umbilical cord blood, the traditional source for stem cells, and they can be safely extracted for transplantation.

“Yes, the stem cells are there; yes, they are viable; and yes, we can get them out,” declared Dr. Frans Kuypers, one of the scientists who led the research with fellow scientist Vladimir Serikov.
The study was conducted using placentas from healthy women undergoing elective Caesarean section. It will be the feature story in the July 2009 issue of Experimental Biology and Medicine.

The scientists said it is highly likely the cells could be used in therapies to cure chronic blood-related disorders such as sickle cell disease, thalassemia, and leukemia.

One of the limits of umbilical cord blood is that the stem cells it contains are few in number. That makes the likelihood that they can be used to cure a blood disorder in adults fairly slim. Researchers hope that stem cells from the placenta will provide a bigger supply.

Kuypers explained that even when a patient receives a cord blood transplant, there may not be enough stem cells in the umbilical cord to successfully treat their disorder.

“The greater supply of stem cells in placentas will likely increase the chance that an HLA (human leukocyte antigen) matched unit of stem cells engrafts, making stem cell transplants available to more people. The more stem cells, the bigger the chance of success,” said Kuypers.
Kuypers and Serikov have developed a patent-pending method that will allow the freezing of placentas to store them in a way that allows them to later be defrosted and to enable the extraction of viable stem cells. The method will make it possible for companies to gather, ship and store placentas in a central location.

“We’re looking for a partnership with industry to get placenta-derived stem cells in large quantities to the clinic,” said Kuypers in a statement.
He added that while more research is needed to explore the maximum potential of this latest discovery, he is optimistic his work will lead to cures.
“Someday, we will be able to save a lot more kids and adults from these horrific blood disorders.”

from CTV

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Using a patient’s own stem cells, researchers at Johns Hopkins have corrected the genetic alteration that causes sickle cell disease (SCD), a painful, disabling inherited blood disorder that affects mostly African-Americans. The corrected stem cells were coaxed into immature red blood cells in a test tube that then turned on a normal version of the gene.

The research team cautions that the work, done only in the laboratory, is years away from clinical use in patients, but should provide tools for developing gene therapies for SCD and a variety of other blood disorders.

In an article published online August 31 in Blood, the researchers say they are one step closer to developing a feasible cure or long-term treatment option for patients with SCD, which is caused by a single DNA letter change in the gene for adult hemoglobin, the principle protein in red blood cells needed to carry oxygen. People who inherited two copies — one from each parent — of the genetic alteration, the red blood cells are sickle-shaped, rather than round. The misshapen red blood cells clog blood vessels, leading to pain, fatigue, infections, organ damage and premature death.

Although there are drugs and painkillers that control SCD symptoms, the only known cure — achieved rarely — has been bone marrow transplant. But because the vast majority of SCD patients are African-American and few African-Americans have registered in the bone marrow registry, it has been difficult to find compatible donors, says Linzhao Cheng, Ph.D., a professor of medicine and associate director for basic research in the Division of Hematology and also a member of the Johns Hopkins Institute for Cell Engineering. “We’re now one step closer to developing a combination cell and gene therapy method that will allow us to use patients’ own cells to treat them.”

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Dozens of people who were blinded or otherwise suffered severe eye damage when they were splashed with caustic chemicals had their sight restored with transplants of their own stem cells — a stunning success for the burgeoning cell-therapy field, Italian researchers reported Wednesday.

The treatment worked completely in 82 of 107 eyes and partially in 14 others, with benefits lasting up to a decade so far. One man whose eyes were severely damaged more than 60 years ago now has near-normal vision.

“This is a roaring success,” said ophthalmologist Dr. Ivan Schwab of the University of California, Davis, who had no role in the study — the longest and largest of its kind.

Stem cell transplants offer hope to the thousands of people worldwide every year who suffer chemical burns on their corneas from heavy-duty cleansers or other substances at work or at home.

The approach would not help people with damage to the optic nerve or macular degeneration, which involves the retina. Nor would it work in people who are completely blind in both eyes, because doctors need at least some healthy tissue that they can transplant.

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