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Vol. 46, No. 2, 2002
Issue release date: October 2002
Neuropsychobiology 2002;46:76–84
(DOI:10.1159/000065416)

Innate Immunity Associated with Inflammatory Responses and Cytokine Production against Common Dietary Proteins in Patients with Autism Spectrum Disorder

Jyonouchi H. · Sun S. · Itokazu N.
Department of Pediatrics, University of Minnesota, Minneapolis, Minn., USA

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Abstract

Objectives: Children with autism spectrum disorder (ASD) frequently reveal various gastrointestinal (GI) symptoms that may resolve with an elimination diet along with apparent improvement of some of the behavioral symptoms. Evidence suggests that ASD may be accompanied by aberrant (inflammatory) innate immune responses. This may predispose ASD children to sensitization to common dietary proteins (DP), leading to GI inflammation and aggravation of some behavioral symptoms. Methods: We measured IFN-γ, IL-5, and TNF-α production against representative DPs [gliadin, cow’s milk protein (CMP), and soy] by peripheral blood mononuclear cells (PBMCs) from ASD and control children [those with DP intolerance (DPI), ASD siblings, and healthy unrelated children]. We evaluated the results in association with proinflammatory and counter-regulatory cytokine production with endotoxin (LPS), a microbial product of intestinal flora and a surrogate stimulant for innate immune responses. Results: ASD PBMCs produced elevated IFN-γ and TNF-α, but not IL-5 with common DPs at high frequency as observed in DPI PBMCs. ASD PBMCs revealed increased proinflammatory cytokine responses with LPS at high frequency with positive correlation between proinflammatory cytokine production with LPS and IFN-γ and TNF-α production against DPs. Such correlation was less evident in DPI PBMCs. Conclusion: Immune reactivity to DPs may be associated with apparent DPI and GI inflammation in ASD children that may be partly associated with aberrant innate immune response against endotoxin, a product of the gut bacteria.



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