The pathogenesis of motor neuron degeneration caused by a triplet repeat expansion in the androgen receptor gene.

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Male sex hormones, or androgens, work by binding to a specific receptor, known as the androgen receptor. Androgens have an important and yet poorly understood role in nerve function. Our research is investigating how a genetic mutation in the androgen receptor causes Kennedy?s disease. This is a rare disease, affecting adult males, which causes nerves to die. The nerves which are affected are those supplying our muscles, called motor neurons. This leads to muscle wasting in the face and body. Other symptoms include testicular wasting, reduced fertility and breast tissue enlargement. It is currently not known what causes motor nerves to degenerate in Kennedy?s disease. We are endeavouring to investigate the cause of Kennedy?s disease via the generation of a transgenic mouse carrying this mutation. It is only through a studying transgenic mouse affected by this disease can we begin to understand what is happening to nerves to cause them to die, and importantly, how can we prevent them from dying. These studies will also provide crucial information on the effects of sex hormones on nerves. As there is currently no treatment for Kennedy?s disease, an aim of this project is to investigate how we can treat this disease. This will be the first time that we can systemically test potential treatments and work toward preventing the degeneration of these nerves. Kennedy?s disease is related to a number of other neurodegenerative diseases including Huntington?s disease, which are caused by similar genetic mutations. All of these diseases are caused by degeneration of specific nerve cells. Evidence suggests that there may be similar mechanisms involved in all of these diseases. The results of this study will therefore help us to understand a range of diseases and may eventually lead to the development of therapeutic strategies to prevent their debilitating effects.