New research in mice strengthens a potential strategy for treating fragile X syndrome, the most common inherited form of intellectual disability and a major single-gene cause of autism spectrum disorder.
The results, published April 23 inÂ Cell Reports, suggest that a drug strategy targeting a form of the enzyme PI3 (phosphoinositide-3) kinase could improve learning and behavioral flexibility in people with fragile X syndrome. The PI3 kinase strategy represents an alternative to one based on drugs targeting mGluR5 glutamate receptors, which have had difficulty showing benefits in clinical trials.
Research led by Emory scientistsÂ Gary Bassell, PhD and Christina Gross, PhD had previously found that the p110Î² form of PI3 kinase is overactivated in the brain in a mouse fragile X model, and in blood cells from human patients with fragile X syndrome.
Now they have shown that dialing back PI3 kinase overactivation by using genetic tools can alleviate some of the cognitive deficits and behavioral alterations observed in the mouse model. Drugs that target the p110Î² form of PI3 kinase are already in clinical trials for cancer.
“Further progress in this direction could lead to a clinical trial in fragile X,” says Bassell, who is chair of Cell Biology at Emory University School of Medicine. “The next step is to test whether this type of drug can be effective in the mouse model and in human patient cells.” Read more