Cited by 494Barrier Structure and Function StudiesAutism Spectrum Disorder ResearchChild Nutrition and Feeding Issues

Blood–brain barrier and intestinal epithelial barrier alterations in autism spectrum disorders

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Fiorentino, Maria, Sapone, Anna, Senger, Stefania, Camhi, Stephanie S., Kadzielski, Sarah M., Buie, Timothy M., Kelly, Deanna L., Cascella, Nicola +1 more·2016·Molecular Autism

Abstract

Autism spectrum disorders (ASD) are complex conditions whose pathogenesis may be attributed to gene–environment interactions. There are no definitive mechanisms explaining how environmental triggers can lead to ASD although the involvement of inflammation and immunity has been suggested. Inappropriate antigen trafficking through an impaired intestinal barrier, followed by passage of these antigens or immune-activated complexes through a permissive blood–brain barrier (BBB), can be part of the chain of events leading to these disorders. Our goal was to investigate whether an altered BBB and gut permeability is part of the pathophysiology of ASD. Postmortem cerebral cortex and cerebellum tissues from ASD, schizophrenia (SCZ), and healthy subjects (HC) and duodenal biopsies from ASD and HC were analyzed for gene and protein expression profiles. Tight junctions and other key molecules associated with the neurovascular unit integrity and function and neuroinflammation were investigated. Claudin (CLDN)-5 and -12 were increased in the ASD cortex and cerebellum. CLDN-3, tricellulin, and MMP-9 were higher in the ASD cortex. IL-8, tPA, and IBA-1 were downregulated in SCZ cortex; IL-1b was increased in the SCZ cerebellum. Differences between SCZ and ASD were observed for most of the genes analyzed in both brain areas. CLDN-5 protein was increased in ASD cortex and cerebellum, while CLDN-12 appeared reduced in both ASD and SCZ cortexes. In the intestine, 75% of the ASD samples analyzed had reduced expression of barrier-forming TJ components (CLDN-1, OCLN, TRIC), whereas 66% had increased pore-forming CLDNs (CLDN-2, -10, -15) compared to controls. In the ASD brain, there is an altered expression of genes associated with BBB integrity coupled with increased neuroinflammation and possibly impaired gut barrier integrity. While these findings seem to be specific for ASD, the possibility of more distinct SCZ subgroups should be explored with additional studies.

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Authors
Fiorentino, M., Sapone, A., Senger, S., Camhi, S. S., Kadzielski, S. M., Buie, T. M., Kelly, D. L., Cascella, N., & Fasano, A.
Affiliations
  • Harvard University (US)
  • Beth Israel Deaconess Medical Center (US)
  • Massachusetts General Hospital (US)
  • University of Maryland, Baltimore (US)
  • Sheppard Pratt Health System (US)
Corresponding author
Fiorentino, Maria
Venue
Molecular Autism
Published
2016-11-29
Volume
7
Issue
1
Pages
49-49
ISSN
2040-2392 (ISSN-L)
OpenAlex
W2559475643
Cited by
494
References
124
Citations by year
2026: 40 · 2025: 52 · 2024: 63 · 2023: 66 · 2022: 64 · 2021: 71 · 2020: 56 · 2019: 33 · 2018: 34 · 2017: 15
FWCI
14.97
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Molecular Autism (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
Funders
National Institutes of Health
Topics
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
  • Health Sciences › Medicine › Psychiatry and Mental health › Child Nutrition and Feeding Issues
Keywords
autism spectrum disorder, blood-brain barrier, intestinal epithelial barrier, intestinal permeability, tight junctions, claudins, neuroinflammation, schizophrenia, gene-environment interaction, antigen trafficking, postmortem brain, duodenal biopsy, tricellulin, MMP-9, interleukin-8, IL-1β, Iba1, neurovascular unit
MeSH terms
Autism Spectrum Disorder, Adolescent, Adult, Biopsy, Blood-Brain Barrier, Calcium-Binding Proteins, Cerebellum, Cerebral Cortex, Child, Child, Preschool, DNA-Binding Proteins, Duodenum, Female, Humans, Male, Microfilament Proteins, Middle Aged, Permeability, Schizophrenia, Gene Expression, Case-Control Studies, Interleukin-8, Tight Junctions, Matrix Metalloproteinase 9, Interleukin-1beta, Claudins, Claudin-3, Claudin-5, MARVEL Domain Containing 2 Protein

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