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Research Article

Reduced levels of immunoglobulin in children with autism correlates with behavioral symptoms

Luke Heuer

Division of Rheumatology, Allergy and Clinical Immunology, University of California at Davis, Davis, California

The M.I.N.D. Institute, University of California at Davis, Davis, California

NIEHS Center for Children's Environmental Health, University of California at Davis. Davis, California

The first two authors contributed equally to the generation of this article.Search for more papers by this author
Paul Ashwood

Department of Medical Microbiology and Immunology, University of California at Davis, Davis, California

The M.I.N.D. Institute, University of California at Davis, Davis, California

NIEHS Center for Children's Environmental Health, University of California at Davis. Davis, California

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Joseph Schauer

Division of Rheumatology, Allergy and Clinical Immunology, University of California at Davis, Davis, California

The M.I.N.D. Institute, University of California at Davis, Davis, California

NIEHS Center for Children's Environmental Health, University of California at Davis. Davis, California

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Paula Goines

Division of Rheumatology, Allergy and Clinical Immunology, University of California at Davis, Davis, California

The M.I.N.D. Institute, University of California at Davis, Davis, California

NIEHS Center for Children's Environmental Health, University of California at Davis. Davis, California

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Paula Krakowiak

Department of Public Health Sciences, Division of Epidemiology, University of California at Davis, Davis, California

The M.I.N.D. Institute, University of California at Davis, Davis, California

NIEHS Center for Children's Environmental Health, University of California at Davis. Davis, California

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Irva Hertz‐Picciotto

Department of Public Health Sciences, Division of Epidemiology, University of California at Davis, Davis, California

The M.I.N.D. Institute, University of California at Davis, Davis, California

NIEHS Center for Children's Environmental Health, University of California at Davis. Davis, California

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Robin Hansen

Department of Pediatrics, University of California at Davis, Davis, California

The M.I.N.D. Institute, University of California at Davis, Davis, California

NIEHS Center for Children's Environmental Health, University of California at Davis. Davis, California

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Lisa A. Croen

Division of Research, Kaiser Permanente Northern California, Oakland, California

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Isaac N. Pessah

Department of Veterinary Molecular Biosciences, University of California at Davis, Davis, California

The M.I.N.D. Institute, University of California at Davis, Davis, California

NIEHS Center for Children's Environmental Health, University of California at Davis. Davis, California

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Judy Van de Water

Corresponding Author

E-mail address:javandewater@ucdavis.edu

Division of Rheumatology, Allergy and Clinical Immunology, University of California at Davis, Davis, California

The M.I.N.D. Institute, University of California at Davis, Davis, California

NIEHS Center for Children's Environmental Health, University of California at Davis. Davis, California

Division of Rheumatology, Allergy and Clinical Immunology, University of California at Davis, 451 East Health Sciences Drive, Davis, CA 95616
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First published: 28 November 2008
Cited by: 78

The first two authors contributed equally to the generation of this article.

Abstract

Objectives: To assay if plasma antibody levels in children with autism or developmental delays (DD) differ from those with typical development as an indicator of immune function and to correlate antibody levels with severity of behavioral symptoms.

Methods: Plasma was collected from children with autistic disorder (AU; n=116), DD but not autism (n=32), autism spectrum disorder but not full autism (n=27), and age‐matched typically developing (TD) controls (n=96). Samples were assayed for systemic levels of immunoglobulin (IgG, IgM, IgA, and IgE) by enzyme‐linked immunosorbent assay. Subjects with autism were evaluated using the Autism Diagnostic Observation Schedule and the Autism Diagnostic Interview—Revised, and all subjects were scored on the Aberrant Behavior Checklist (ABC) by the parents. Numerical scores for each of the ABC subscales as well as the total scores were then correlated with Ig levels.

Results: Children with AU have a significantly reduced level of plasma IgG (5.39±0.29 mg/mL) compared to the TD (7.72±0.28 mg/mL; P<0.001) and DD children (8.23±0.49 mg/mL; P<0.001). Children with autism also had a reduced level of plasma IgM (0.670.06mg/mL) compared to TD (0.79±0.05 mg/mL; P<0.05). Ig levels were negatively correlated with ABC scores for all children (IgG: r=−0.334, P<0.0001; IgM: r=−0.167, P=0.0285).

Conclusion: Children with AU have significantly reduced levels of plasma IgG and IgM compared to both DD and TD controls, suggesting an underlying defect in immune function. This reduction in specific Ig levels correlates with behavioral severity, where those patients with the highest scores in the behavioral battery have the most reduced levels of IgG and IgM.

Number of times cited: 78

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