Bradley J. Fikes

Stem-cell biologist Mahendra Rao expected five projects to receive support to set up clinical trials.

Stem-cell researchers at the US National Institutes of Health (NIH) have been left frustrated and confused following the demise of the agencys Center for Regenerative Medicine (CRM). The intramural programmes director, stem-cell biologist Mahendra Rao, left the NIH, in Bethesda, Maryland, on 28March, and the centres website was taken down on 4 April. Although no official announcement had been made at the time Nature went to press, NIH officials say that they are rethinking how they will conduct in-house stem-cell research.

Researchers affiliated with the centre say that they have been left in the dark. When contacted by Nature on 7April, George Daley, a stem-cell biologist at Harvard Medical School in Boston, Massachusetts, and a member of the centres external advisory board, said that he had not yet been told of Raos departure or the centres closure.

The CRM was established in 2010 to centralize the NIHs stem-cell programme. Its goal was to develop useful therapies from induced pluripotent stem (iPS) cells adult cells that have been converted into embryonic-like stem cells and shepherd them towards clinical trials and regulatory approval. Its budget was intended to be $52million over seven years.

Rao took the helm in 2011. Relations seem to have soured last month owing to an NIH decision to award funding to only one project aiming to move iPS cells into a clinical trial. Rao says he resigned after this became clear. He says that he had hoped that five trials would be funded, especially because the centre had already sorted out complex issues relating to tissue sources, patents and informed consent.

James Anderson, director of the NIHs Division of Program Coordination, Planning, and Strategic Initiatives, which administered the CRM, counters that only one application that made by Kapil Bharti of the National Eye Institute in Bethesda and his colleagues received a high enough score from an external review board to justify continued funding. The team aims to use iPS cells to treat age-related macular degeneration of the retina, and hopes to commence human trials within a few years. Several other proposals, which involved the treatment of cardiac disease, cancer and Parkinsons disease, will not receive funding to ready them for clinical trials. Anderson stresses that Bhartis trial will not be affected by the CRMs closure.

NIH

Therapies based on induced pluripotent stem cells, here differentiating into retinal cells on a scaffold, were the focus of the Center for Regenerative Medicine.

Other human iPS-cell trials are further along. For example, one on macular degeneration designed by Masayo Takahashi at the RIKEN Center for Developmental Biology in Kobe, Japan, began recruiting patients last August.

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NIH stem-cell programme closes