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New Hope for Huntington Sufferers

October 9th, 2006 Medgadget Editors Neurology

Cambridge University researchers have developed a new method for testing cognitive decline in mice with Huntington disease by using an automated touch screen. This screen is intended to allow researchers to study more effectively the cognitive difficulties in Huntington’s disease and other neurodegenerative disorders such as in Alzheimer’s and CJD. Here’s is a scoop from Cambridge University:

The automated screen developed by Cambridge scientists provides a simple means of assessing cognition, in a way that requires minimal movement on the part of the mouse. The mouse makes its response by touching its nose to the touch-sensitive screen. This means that the HD mice can complete the task, despite motor problems.
Other benefits are that it is less labour intensive, less time consuming and less stressful for mice, compared to traditional testing methods. Given the difficulties associated with these traditional methods, progress to date in trialling new treatments for cognitive deficits has been slow with contract research organisations understandably reluctant to engage with such research. Given the ease of use of the touch screen system, it is hoped this will change.
Dr Jenny Morton, Dr Lisa Saksida and Dr Tim Bussey from the Departments of Pharmacology and Experimental Psychology at the University of Cambridge, who led the research, tested normal mice and mice carrying the HD gene mutation. The task set was a choice between two visual stimuli on a touch-sensitive computer screen. If a mouse touched the correct stimulus, it was rewarded with food pellets; if it touched the incorrect stimulus, the lights went out and the mouse did not get a reward.
Both normal and HD mice learnt to touch the correct stimulus with their noses and were able to learn the correct stimulus to obtain a reward by day 10.
The researchers also demonstrated that when the stimuli were reversed (so the stimulus that had previously been correct was now incorrect), HD mice struggled with the task although younger HD mice, who had not progressed as far in the disease, eventually learned it. When the mice were then presented with a new pair of stimuli, this proved too difficult even for the younger HD mice.
Importantly, and where the screen is so valuable, all the HD mice were physically able to complete the task (i.e. they were able physically to touch the screen and obtain rewards, even though their responses were often incorrect). This indicates that their poor cognitive performance was not secondary to motor impairments. It also confirms that mice with HD have cognitive problems that worsen with increasing age.

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Medgadget Editors

Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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