Study links fever with improvements to those with autism
Some parents have noted that during periods of fever, their children seem to have exhibited “less autistic” tendencies. There may be an explanation for this now as two doctors from Yeshiva University have published a study in the March 2009 Brain Research Reviews, that proposes autism spectrum disorders (ASD) may be the product of a dysregulated neuron bundle in the brain stem called the locus coeruleus-noradrenergic (LC-NA) system. Of further interest, is their observation that during episodes of fever some children with autism seemed to have improved behavior that then dissipated once the fever had subsided.
According to the study’s authors, Dominick P. Purpura, M.D., dean emeritus and distinguished professor of neuroscience at Einstein and Dr. Mark F. Mehler, M.D., chairman of neurology and director of the Institute for Brain Disorders and Neural Regeneration at Einstein, the LC-NA system is the only brain region involved both in controlling behavior and producing fever. This area of the brain is largely responsible for the production of noradrenaline, a neurotransmitter that induces our body’s “fight or flight” reaction. Noradrenaline is also a key for higher-order sensory processing of environmental stimuli, and facilitating the ability to focus one’s attention. Attentional focusing is frequently one of the deficits for those with ASD.
The cause of this dysregulation of the LC-NA system is attributed broadly to genetic and epigenetic (chemical influencers of genomes) factors, environment and also maternal stress during pregnancy. On this last point, they cite a 2008 study, published in the Journal of Autism and Developmental Disorders documenting a higher frequency of children with ASD born from mothers who had been exposed to topical storms and hurricanes mid-gestation.
While the study does not advocate inducing fever – which could be quite dangerous – they note that these findings may serve as the foundation for the development of new therapies targeting the LC-NA systems in such a way as to re-regulate how this area of the brain works. As Dr. Mehler notes, “We now have clues to the neurobiology, the genetics, and the epigenetics of autism. To move forward, we need to invest more money in basic science to look at the genome and the epigenome in a more focused way.”
Brian Field is the National Autism Examiner and co-founder of the Autism Support Network
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