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Enriching Environment Stimulates Neurons: Hope For Fragile X Syndrome

A new finding by a team of researchers, led by Huibert Mansvelder reveals that a stimulating environment can restore the malfunctioning neuronal machinery of Fragile X syndrome . The findings have been published in the May 24, 2007 issue of the journal Neuron, published by Cell Press.

A type of inherited mental retardation; Fragile X syndrome affects 1 in 3600 males and 1 in 4000 to 6000 females. The researchers carried out studies on mice that were genetically altered to match the defects in humans with this mental disorder. The scientists performed a detailed analysis of the electrophysiological properties of neurons in the prefrontal cortex, a region responsible for higher cognitive functions, including learning and memory, that are affected in humans with the disorder.

The scientists analysis revealed that the neurons in the mice showed reduction of a particular form of a process called "long-term potentiation" that is central to the formation of new circuit pathways in learning and memory. The researchers experiments showed that this reduction was due to abnormalities in the pore-like channels that regulate the flow of calcium into neurons.

Importantly, they found that increased stimulation of neurons in the mice, which enhanced calcium signaling, could restore normal long-term potentiation and neuronal plasticity.

There have been reports that Fragile X patients can still learn and memorize information but need more repetition and stimulation. Also, studies by other researchers had shown that exposing Fragile X knockout mice to a stimulating environment ameliorated behavioral and neuronal abnormalities.

So, Mansvelder and colleagues tested whether exposure of the knockout mice to an enriched environment caused higher stimulation that would restore normal neuronal plasticity. They gave such mice a variety of cage toys, and also gave them time in play cages that contained running wheels, tunnel
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