Autism Mutations and Marijuana Affect the Same Brain Pathway
Mutations associated with autism block the action of brain molecules that act on the same receptors that marijuana’s active chemical acts on, say researchers from Stanford University Medical School. The findings implicate specific molecules, called endocannabinoids, in the development of some autism cases and point to potential treatment strategies.
“Endocannabinoids are molecules that are critical regulators of normal neuronal activity and are important for many brain functions,” says first author Csaba Földy, Ph.D. “By conducting studies in mice, we found that neuroligin-3, a protein that is mutated in some individuals with autism, is important for relaying endocannabinoid signals that tone down communication between neurons.”
When the researchers introduced different autism-associated mutations in neuroligin-3 into mice, this signaling was blocked and the overall excitability of the brain was changed. “These findings point out an unexpected link between a protein implicated in autism and a signaling system that previously had not been considered to be particularly important for autism,” says senior author Dr. Thomas Südhof, M.D. “Thus, the findings open up a new area of research and may suggest novel strategies for understanding the underlying causes of complex brain disorders.”
The results also indicate that targeting components of the endocannabinoid signaling system may help reverse autism symptoms.
The study was reported online yesterday in the Cell Press journal Neuron. The paper is titled “Autism-Associated Neuroligin-3 Mutations Commonly Disrupt Tonic Endocannabinoid Signaling”.