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Stem Cell Treatment May Be Used To Create New Eggs To Treat Infertility

While Pope Benedict might not approve, researchers are a step closer to using stem cell treatment to generate new oocytes:

Stem cells in young women’s ovaries are capable of producing new eggs, according to a new study. The findings challenge 60 years of dogma that women are born with all the eggs they’ll ever have.

For the study, published in the Feb. 26 issue of Nature Medicine and led by Jonathan Tilly of Massachusetts General Hospital, researchers examined healthy human ovaries donated by 20-something Japanese women who were undergoing a sex-change operation. The researchers fished out stem cells by searching for a protein found only on the surface of stem cells. The researchers then injected those stem cells into pieces of human ovary, transplanting the tissue under the skin of mice, to provide the tissue with a nourishing blood supply. What happened? New egg cells formed within two weeks.

That’s still a long way from showing they’ll mature into usable, quality eggs, David Albertini, director of the University of Kansas’ Center for Reproductive Sciences, cautioned. Still, these findings could lead to better treatments for women left infertile because of disease – or simply because they’re getting older. “Our current views of ovarian aging are incomplete. There’s much more to the story than simply the trickling away of a fixed pool of eggs,” Tilly, who has long hunted these cells in a series of controversial studies, said.

Tilly’s previous work has drawn skepticism, and independent experts urged caution about the latest findings, so the next step is to see whether other laboratories can verify the work. If the findings are confirmed, then it would take years of additional research to learn how to use the cells, Teresa Woodruff, fertility preservation chief at Northwestern University’s Feinberg School of Medicine, said.

“This is experimental,” Dr. Avner Hershlag, chief of the Center for Human Reproduction at North Shore-LIJ Health System in Manhasset, N.Y., told HealthDay. He said the study is “exciting” but emphasized the work is still very preliminary. “This is a beginning of perhaps something that could bring in new opportunities, but it’s going to be a long time in my estimation until clinically we’ll be able to actually have human eggs created from stem cells that make babies.”

Still, even a leading critic said such research may help dispel some of the enduring mystery surrounding how human eggs are born and mature. “This is going to spark renewed interest, and more than anything else it’s giving us some new directions to work in,” Albertini said. While he has plenty of questions about the latest work, “I’m less skeptical,” he said.

Scientists have long taught that all female mammals are born with a finite supply of egg cells, called ooctyes, that runs out in middle age. Tilly, Mass General’s reproductive biology director, first challenged that notion in 2004, reporting that the ovaries of adult mice harbor some egg-producing stem cells. Recently, Tilly noted, a lab in China and another in the U.S. also have reported finding those rare cells in mice.

More work is needed to tell exactly what these cells are, cautioned reproductive biologist Kyle Orwig of the University of Pittsburgh Medical Center, who has watched Tilly’s work with great interest. But if they’re really competent stem cells, Orwig asked, then why would women undergo menopause? Indeed, something so rare wouldn’t contribute much to a woman’s natural reproductive capacity, added Northwestern’s Woodruff.

Tilly argues that using stem cells to grow eggs in lab dishes might one day help preserve cancer patients’ fertility. Today, Woodruff’s lab and others freeze pieces of girls’ ovaries before they undergo fertility-destroying chemotherapy or radiation. They’re studying how to coax the immature eggs inside to mature so they could be used for in vitro fertilization years later when the girls are grown. If that eventually works, Tilly says stem cells might offer a better egg supply.

While this breakthrough is promising, it appears that any potential clinical use is still many years out. Parenthetically, three years ago a research team in China was able to generate new eggs from mouse ovaries. So while this is not a novel concept, it appears researchers are getting closer.


One comment for “Stem Cell Treatment May Be Used To Create New Eggs To Treat Infertility”

  • Embryonic stem cell therapy treats cancer/tumor by:

    1. generating a large number of functional cells to suppress tumor cell growth;

    2. generating various immune cells to enhance the immune functions and kill tumor cells;

    3. generating newborn functional cells to improve the micro-environment in the body to fight against tumors;

    4. preventing metastasis.

    Cancer is a common and frequent-occurring disease. Malignant cancer is currently one of the most serious diseases that endanger human health. Tumor cells are from the body’s own cells. Aging cells change their function and modality and lose their connection with surrounding cells. Under the effects of extraneous factors including radiation, chemistry and internal factors including low immunity and genetics, their dominant growth form cancer.

    Transplantation of Embyonic Stem Cells is the biotechnology to most effectively treat cancer. It doesn’t bring any harm to the body.

    Embryonic stem cells: regenerating a large number of functional cells to suppress tumor cell growth.

    Normal functional cells are in a variety of connections. Among them, gap junction is the foundation of transmission of chemical signals including growth regulators. However, there are only less gap junctions in tumor, which leads to malignant proliferation of tumor cells and their rapid growth. Through transplantation, stem cells getting into the body reach lesions with the blood circulation. They then produce various functional cells and repair damaged tissues. The newborn young and healthy cells are structurally integrity, have strong function and active metabolism. They can build normal gap junctions with tumor cells, and suppress tumor cell growth by transmitting growth suppressing factors.
    At the same time, they can restore cell growth cycle and normal apoptosis of tumor cells, and reduce the opportunities of tumor damages to the body and metastasis.

    Embryonic stem cells: Newborn functional cells improve microenvironment in the body to fight against tumor

    Normally, microenvironment created by various cells in the body can identify cells with gene mutations (tumor cell) and secrete some growth suppressing factors and differentiation signal molecules. However, microenvironments in patients with tumor are destroyed, directly causing that the body loses its ability to control tumor cells by itself. The transplantation of embryonic stem cells can repair and renew the whole microenvironment. Tongyuan stem cells can proliferate and differentiate functional cells of tissues and organs and repair and promote their physiological functions. Along with the repair and improvement of microenvironment in the body, newborn cells continuously excrete growth suppressing factors and tightly regulate tumor cell growth again. At the same time, high concentration of differentiation signals can act on tumor cells to prevent their growth, losing their hazards to the body.

    Embryonic stem cells: preventing the occurrence of tumor

    Tumor occurrence is related to decreased immunity and genetics. When the body is in sub-health or reaches a certain age, the immunity is decreased and cannot immediately cleanup aging cells. On the basis of genetic susceptibility, it is easy to form tumor. Transplantation of embryonic stem cells can produce new functional cells to restore immunity and accelerate the replacement of old cells with new ones, which eliminates the accumulation of and prevents tumor formation from the cell level. Eembryonic Stem Cell Therapy is the best option to prevent disease in people with high cancer risk.

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