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Apr 25, 2013

Gut Bug Vaccine May Alleviate Autism Symptoms

  • Researchers have created what they say is a first-ever vaccine for gut bacteria common in autistic children, which may also help control some autism symptoms. They developed a carbohydrate-based vaccine against the gut bug, Clostridium bolteae.

    C. bolteae is known to play a role in gastrointestinal disorders, and it often shows up in higher numbers in the GI tracts of autistic children than in those of healthy kids. More than 90% of children with autism spectrum disorders suffer from chronic, severe gastrointestinal symptoms. Of those, about 75% suffer from diarrhea, according to current literature.

    “Little is known about the factors that predispose autistic children to C. bolteae,” says University of Guelph chemistry professor Mario Monteiro, Ph.D. Although most infections are handled by some antibiotics, he says, a vaccine would improve current treatment.

    “This is the first vaccine designed to control constipation and diarrhea caused by C. bolteae and perhaps control autism-related symptoms associated with this microbe,” he says.

    Autism cases have increased almost sixfold over the past 20 years, and scientists don’t know why. Although many experts point to environmental factors, others have focused on the human gut. Some researchers believe toxins and/or metabolites produced by gut bacteria, including C. bolteae, may be associated with symptoms and severity of autism, especially regressive autism.

    The new anti-C. bolteae vaccine targets the specific complex polysaccharides, or carbohydrates, on the surface of the bug. The vaccine effectively raised C. bolteae-specific antibodies in rabbits. Doctors could also use the vaccine-induced antibodies to quickly detect the bug in a clinical setting, comments Dr. Monteiro.

    He cautions that the vaccine might take more than 10 years to work through preclinical and human trials, and it may take even longer before a drug is ready for market. “But this is a significant first step in the design of a multivalent vaccine against several autism-related gut bacteria,” he says.

    The study appears online in the journal Vaccine, in a paper titled “A vaccine and diagnostic target for Clostridium bolteae, an autism-associated bacterium”.


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