Eggs made from ovarian stem cells

Scientists are heading for a breakthrough that could help infertile women have babies as well as make women as fertile in later life as men.

They are about to request a licence from the British fertility authorities to fertilize the first human egg cells, which have been grown entirely in the laboratory from stem cells.

This could revolutionize fertility treatment and might even lead to a reversal of the menopause in older women.

The eggs could be fertilized later this year as part of a series of tests to generate an unlimited supply of human eggs, the Independent reported.

Producing human eggs from stem cells would also open up the possibility of replenishing the ovaries of older women so that they do not suffer the age-related health problems associated with the menopause, from osteoporosis to heart disease.

Some scientists are even suggesting the possibility of producing an "elixir of youth" for women, where the menopause is eradicated and older women will retain the health they enjoyed when younger.

Researchers at Edinburgh University are working with a team from Harvard Medical School in Boston to be the first in the world to produce mature human eggs from stem cells isolated from human ovarian tissue.

Until now, it has only been possible to isolate a relatively small number of mature human egg cells directly from the ovaries of women who have been stimulated with hormones. This technical limitation has led to an acute shortage of human eggs, or "oocytes," for IVF treatment as well as scientific research.

The scientists want to fertilize the laboratory-grown egg cells with human sperm to prove that they are viable. Any resulting embryos will be studied for up to 14 days - the legal limit - to see if they are normal.

These early embryos will not be transplanted into a woman's womb because they will be deemed experimental material, but will either be frozen or allowed to perish.

Evelyn Telfer, a reproductive biologist at Edinburgh University, has already informally approached the Human Fertilization and Embryology Authority (HFEA) with a view to submitting a formal licence application within the next few weeks.

"We hope to apply for a research license to do the fertilization of the in vitro grown oocytes within the IVF unit at the Edinburgh Royal Infirmary," Dr Telfer said. (The Times of India)