From Nature by Ewen Callaway
Human embryonic stem cells that are potentially pure enough to be used in therapies have been deposited into the UK Stem Cell Bank, and will soon be available across Europe.
To make ‘clinical-grade’ cells, scientists produced them without the use of any of the animal cells or products typically needed, and did so under certified manufacturing conditions. They are the highest-quality cells of their kind publicly available, says Peter Braude, a stem-cell scientist at King’s College London whose team derived them at an estimated cost of £3 million (US$4.7 million). Much of the money went into infrastructure that will enable the creation of additional clinical-grade cell lines, he says.
“There are quite a few end users who would love to get their hands on these cells, and they will as soon as they are available,” said Daniel Brison, a stem-cell scientist at the University of Manchester, UK, at a press briefing in London today. His own team expects to deposit a clinical-grade human embryonic stem-cell line into the UK Stem Cell Bank in 2012. Elsewhere in the United Kingdom, researchers at the University of Sheffield and Roslin Cells, a company based in Edinburgh, are also establishing clinical-grade lines.
The new cells are not the first clinical-grade cells. Two small trials are already under way. One is using cells derived from human embryonic stem cells to treat spinal cord injury (although funding problems have stopped the trial enrolling new patients) and another is testing a treatment for age-related macular degeneration. Another macular degeneration trial will start soon. But these trials involve cells that were originally created using animal products for research . After a long vetting process, scientists converted them to clinical grade.
And a Singapore-based group created six clinical-grade cell lines in 2007, also using animal products1. These lines are available for researchers funded by the US National Institutes of Health (NIH) and the California Institute for Regenerative Medicine (CIRM) in San Francisco, says Jeremy Crook, a stem cell biologist at the University of Melbourne, Australia, who led the team that made the lines.
But Braude says cells that have never touched the mouse ‘feeder’ cells or calf serum typically used to nourish human embryonic stem-cell lines are the safest source of cells for clinical trials. His team describes the creation of their cell lines in the journal Cytotherapy2. Braude says his team has tested the cell lines for viral and mycoplasma infection, as well as for genetic abnormalities.
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