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Small intestinal enteropathy with epithelial IgG and complement deposition in children with regressive autism

Abstract

We have reported lymphocytic colitis in children with regressive autism, with epithelial damage prominent. We now compare duodenal biopsies in 25 children with regressive autism to 11 with coeliac disease, five with cerebral palsy and mental retardation and 18 histologically normal controls. Immunohistochemistry was performed for lymphocyte and epithelial lineage and functional markers. We determined the density of intraepithelial and lamina propria lymphocyte populations, and studied mucosal immunoglobulin and complement C1q localisation. Standard histopathology showed increased enterocyte and Paneth cell numbers in the autistic children. Immunohistochemistry demonstrated increased lymphocyte infiltration in both epithelium and lamina propria with upregulated crypt cell proliferation, compared to normal and cerebral palsy controls. Intraepithelial lymphocytes and lamina propria plasma cells were lower than in coeliac disease, but lamina propria T cell populations were higher and crypt proliferation similar. Most strikingly, IgG deposition was seen on the basolateral epithelial surface in 23/25 autistic children, co-localising with complement C1q. This was not seen in the other conditions. These findings demonstrate a novel form of enteropathy in autistic children, in which increases in mucosal lymphocyte density and crypt cell proliferation occur with epithelial IgG deposition. The features are suggestive of an autoimmune lesion.

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Acknowledgements

FT and PA were supported by Sir Samuel Scott of Yews Charitable Trust and Medical Interventions in Autism. RIF received support from the Swiss National Science Foundation, M und W Lichtenstein-Stiftung, FAG Basel, Ciba-Geigy Jubiläums-Stiftung and Akademische Nachwuchsförderung der Universität Basel, Switzerland. AA was supported by the Normanby Charitable Trust and the PF Charitable Trust. This study could not have been completed without the skill and expertise of the staff of Malcolm Ward and the paediatric endoscopy unit, Royal Free Hospital. We thank colleagues from the Departments of Haematology, Biochemistry, Immunology and Radiology for their analyses of the children.

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Torrente, F., Ashwood, P., Day, R. et al. Small intestinal enteropathy with epithelial IgG and complement deposition in children with regressive autism. Mol Psychiatry 7, 375–382 (2002). https://doi.org/10.1038/sj.mp.4001077

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