Scientists are growing living brain cells from skin samples which could help research into treatments for schizophrenia and bipolar disorder.

Scientists at the University of Edinburgh are growing the cells from skin samples taken from families known to carry faulty genes, which are believed to cause mental illness.

The project, which has received 1 million in funding from the National Centre for the Replacement, Refinement and Reduction of Animals in Research (NC3Rs), aims to develop brain stem cells that could be used to test and screen drugs.

Scientists said it is not easy to understand the diseases using animal models and it is difficult to predict if possible new treatments will work.

They hope using cell-based systems derived from the skin or hair of affected patients will enable researchers to create tests that are more relevant to the disease in humans, and will reduce the dependence on animal models.

Andrew McIntosh, professor of biological psychiatry, said: "We are making different types of brain cells out of skin samples from people with bipolar disorder and schizophrenia.

"Once we have grown these in the laboratory we can then study the cells' neurological function and see how they respond to standard psychiatric treatments. Following this, we hope to be able to screen new medicines."

In the past, researchers used brain tissue from people with schizophrenia and bipolar depression from deceased donors to gain insight into these brain conditions. Scientists said that access to the living brain cells is an exciting development in studying mental illness.

The university said that between 1% and 4% of the world's population is diagnosed with bipolar disorder or schizophrenia, for which there are few highly effective treatments. Little is known about the causes of these conditions but a genetic component is involved as it can run in families.

Well over a million people in the UK are said to be affected by these conditions.

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Living brain cells used in research